Дисертації: "Contact dermatitis"

1

Hayakawa, Ritsuko. "Contact Dermatitis." Nagoya University School of Medicine, 2000. http://hdl.handle.net/2237/5356.

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Reis, Felipe Rovere Diniz 1979. "Dermatite alergica de contato ocupacional = perfil clinico-epidemiologico dos pacientes atendidos no ambulatorio de medicina do trabalho da Unicamp." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/310058.

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Orientador: Jose Inacio de Oliveira
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas
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Resumo: Diversos estudos descrevem o perfil clínico-epidemiológico e os resultados dos testes de contato das populações atendidas com suspeitas de dermatite alérgica de contato. Alguns evidenciam a provável relação causal com o trabalho; outros alertam para a necessidade de repetição do teste quando ocorrem múltiplas reações, principalmente nas demandas trabalhistas. O objetivo foi analisar o perfil clínico-epidemiológico e os resultados dos testes de contato dos pacientes com suspeita de dermatite alérgica de contato ocupacional atendidos no Ambulatório de Medicina do Trabalho da Universidade Estadual de Campinas. Foi realizado um estudo descritivo transversal retrospectivo com pacientes atendidos entre 1 de janeiro de 1999 e 31 de dezembro de 2008, envolvendo as seguintes variáveis: idade, cor, sexo, ocupação, tempo na ocupação, agente referido como sensibilizante, local inicial do eczema, origem do encaminhamento, resultados dos testes de contato e nexo causal. Foram analisados 180 prontuários e os resultados mostraram que o perfil clínicoepidemiológico foi semelhante àqueles referidos na literatura, mas os índices desensibilização foram proporcionalmente maiores: 85% dos pacientes tiveram pelo menos uma reação positiva no primeiro teste de contato, a média de reações positivas por teste foi 3,38 e 68% dos testes positivos apresentaram mais de duas reações positivas. Os elevados índices de sensibilização e a existência simultânea de múltiplas reações na maioria dos pacientes podem ser explicados por condições predisponentes para polissensibilização - dermatite nas mãos cronificadas por repetidas exposições ocupacionais - e/ou pela interpretação de reações irritativas como reações positivas. Foi sugerida, então, uma Ficha de Coleta de Dados, a ser preenchida durante as avaliações clínicas e a repetição dos testes de contato quando ocorrerem mais de 2 reações positivas relevantes a substâncias não correlacionada
Abstract: Several studies describe the clinical and epidemiological profile and the results of patch tests of the targeted population with suspected allergic contact dermatitis. Some evidence the probable causal relationship to work; others warn of the need to repeat tests when multiple reactions occur, especially in the lawsuits. The objetive was to analyze the clinical and epidemiological profile and the results of patch tests of patients with suspected allergic contact dermatitis treated at the Campinas State University's Occupational Medicine Clinic. We conducted a retrospective cross-sectional study with patients treated between January 1, 1999 and December 31, 2008 involving the following variables: age, race, sex, occupation, time in occupation, sensitizing agent, eczema locus, referral source, results of patch tests and causal relationship. We analyzed 180 medical records and the results show that clinical and epidemiological profile was similar to those reported in the literature, but the rates of awareness were proportionally larger: 85% of patients had at least one positive reaction in the first patch test, the average of positive reactions per test was 3.38 and 68% dos positive tests had more than two positive reactions. High levels of sensitization and the simultaneous existence of multiple reactions in most patients can be explained by predisposing factors to polysensization - cronic dermatitis on the hands caused by repeated occupational exposure - and/or by the interpretation of irritant reactions as positive reactions. It has been suggested then a sheet data collection to use in the clinic evaluation that includes the repetition of tests when more than 2 relevant positive reactions occurred to substances not correlated
Mestrado
Epidemiologia
Mestre em Saude Coletiva

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3

Kerr, Alastair. "Photoallergic contact dermatitis in Europe." Thesis, University of Dundee, 2012. https://discovery.dundee.ac.uk/en/studentTheses/8202b022-08c8-4714-b85f-e231e474f8b8.

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Photoallergic contact dermatitis (PACD) is a clinical problem that has often been poorly understood and neglected by dermatologists over recent years. This can be partly attributed to its investigation by photopatch testing (PPT) falling between the expertise of photobiologists and contact dermatitis clinicians. One result of this situation was that no European Baseline PPT series had been agreed on. To redress this, the European multi centre photopatch test study (EMCPPTS) was conceived to provide up to date information on which photoallergens are of greatest clinical relevance. Its conduct and results form the core research project of this thesis. To enable the EMCPPTS to proceed and its results to be viewed in a wider context, the other Chapters of this thesis explore important related aspects of PACD and PPT in Europe. The introduction examines the nature of PACD and PPT and reviews current photoallergens. Then, the investigation of the two photoallergens carprofen and chlorproethazine by PPT is recounted. These studies highlight deficiencies within the current European regulatory system for preventing photoallergens from reaching the marketplace, as well as providing templates for the investigation of new photoallergens in the human environment. This is followed by a pilot PPT study which provides new information on the optimum non-irritating concentration of the 19 ultraviolet sunscreen absorbers to be used in the EMCPPTS. The issue of attempting to determine the photoallergenic potential of the EMCPPTS agents with respect to exposure patterns is addressed by conducting a sunscreen survey in the UK. The EMCPPTS itself is then detailed, as well as the difficulties that can be encountered when conducting a large clinical study of this nature. The results from the EMCPPTS and other presented studies were shown to be of importance in deciding upon a new European Baseline PPT series. The process involved in deciding this series, as well as its content are described before overall conclusions and possible future studies in the domain of PACD and PPT are discussed.

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4

Lampe, Kenneth F. "Contact Dermatitis from Sonoran Desert Plants." University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/609073.

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5

Bensefa-Colas, Lynda. "Analyse des dermatoses professionnelles au sein du réseau national de vigilance et de prévention des pathologies professionnelles (RNV3P) : distribution, tendances et situations professionnelles à risque." Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCB155.

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Contexte : Les dermatoses professionnelles sont l’une des principales causes de pathologies professionnelles en Europe, et dans près de 80% des cas, elles concernent des dermatites de contact professionnelles (DCP). Les DCP comprennent les dermatites allergiques de contact (DAC), les dermatites irritatives de contact (DIC) et les urticaires de contact (UC). En France, les secteurs et nuisances à risque de DCP et les tendances chronologiques de DCP sont très peu documentés. Objectifs : 1) étudier les tendances observées au fil du temps vis-à-vis du nombre de cas de dermatoses professionnelles, des secteurs d’activité concernés et des nuisances mises en cause, 2) mettre en évidence des secteurs ou des postes à risque de dermatoses professionnelles. Méthode : Ce travail de thèse s’appuie sur le réseau français RNV3P (Réseau national de vigilance et de prévention des pathologies professionnelles) qui assure le suivi des évènements de santé liés au travail sur l’ensemble du territoire, en centralisant les informations recueillies dans ses 32 centres de consultations de pathologies professionnelles (CCPP). Les analyses ont porté sur les DAC, les DIC et les UC en lien probable ou certain avec le travail et recensées dans le RNV3P entre 2001 et 2010. L’analyse des évolutions temporelles a été réalisée à partir des rapports de cote de signalement (Reporting Odds-Ratio, ROR). Deux méthodes statistiques ont été utilisées : le coefficient de corrélation de rang de Kendall sur les ROR estimés chaque année et le modèle logistique calculant la variation annuelle des cas. Résultats : Les 5990 cas de DCP notifiés touchent plus fréquemment les femmes, dans des tranches d'âges jeunes. Les principaux secteurs mis en cause pour les trois DCP se distribuent différemment en fonction du sexe et sont, par ordre décroissant de fréquence : santé et action sociale, services personnels, construction, métallurgie et travail des métaux, administrations publiques, services fournis principalement aux entreprises, commerce et réparation automobile, hôtellerie et restauration. Les DCP associées aux cosmétiques (savons ou substances parfumantes) et les biocides augmentent significativement dans le secteur de la santé et de l’action sociale ; les produits de coiffure et les cosmétiques (savons essentiellement) augmentent dans celui des services personnels, essentiellement parmi les coiffeuses. On observe une montée des cas de DAC aux résines époxy dans la construction sur la période et les DIC liées au ciment dans ce secteur ne baissent pas. Les cas de DAC aux métaux augmentent dans le secteur des services fournis aux entreprises (personnels de nettoyage). Nos résultats ont aussi montré une hausse des DAC liées aux isothiazolinones, quel que soit le secteur (+38%) et une baisse des DIC liées à l’action de lavage des mains (utilisation itérative des savons). Par ailleurs, nos données ont objectivé l’impact de mesures réglementaires ou de politiques visant à prévenir les DCP : la mise en place de la directive européenne « Ciment » (2003/53/CE) en 2005 s’est accompagnée d’une réduction de moitié des cas de DAC et une baisse similaire a été observée à partir des données du réseau britannique EPIDERM, confortant nos conclusions ; la campagne de substitution des gants en latex dans le secteur de soins au milieu des années 2000 est suivie d’une réduction significative de la notification des cas d’UC. Conclusion : Ces résultats démontrent, avec l’exemple des dermatoses professionnelles, la capacité du RNV3P à orienter les politiques nationales en matière de prévention des risques professionnels et à en évaluer l’efficacité
Background: In Europe, occupational skin disease is one of the major causes of work-related diseases, among them occupational contact dermatitis (OCD) accounts for 80% of all cases of OSD reported, but data about sectors and agents at risk remains sparse. Objectives: 1) to study OCD trends in terms of industrial activities and main causal agents, 2) to describe industrial sectors or occupations at risk of OCD. Method: Data were collected from the French National Network of Occupational Disease Surveillance and Prevention (RNV3P) during 2001-2010 period, based on the 32 French Occupational and Environmental Disease Consultation Centres. All allergic contact dermatitis (ACD), irritative contact dermatitis (ICD) and contact urticaria (CU) probably or certainly work-related were included in the study. Trends were examined (i) on annual crude numbers of OCD and (ii) on reported odds-ratios of OCD calculated using logistic regression models. Results: 5990 OCD cases were included and concerned more frequently young age classes among women and older age classes among men. Industrial sectors more commonly involved in OCD concerned in decreasing order: health and social work activities, personal service activities, construction, metal industry, public administrations, other business activities, retail trade and repair of motor vehicles, and hotels and restaurants. According to trend analysis of OCD cases, cosmetics (including soaps and fragrances) and biocides increased significantly in health and social work activities; hairdressing products and cosmetics (mainly soaps) in personal service activities (including primarily hairdressers). In construction sector, ACD due to epoxy resins increased during the study period and concomitantly, ICD attributed to cement did not decrease underlying the lack of prevention in this sector at risk. ACD due to metals increased in other business activities mainly occupied by cleaning staff. We showed a rise of ACD due to isothiazolinone compounds whatever the sector. Besides, we have shown the impact of regulatory measures or prevention campaign on OCD: (i) a significant reduction by almost half in the occurrence of ACD attributed to chromate in cement which coincides with the implementation of the European Cement directive and we obtained similar results to a study based on the UK EPIDERM network; (ii) the effectiveness of latex exposure prevention measures for health care workers since half of 2000s and (iii) the wide use of disinfection with an alcohol-based solution in health and social work activity followed by a significant reduction of ICD due to iterative handwashing with soap. Conclusion: RNV3P data allowed to highlight causal agents involved in sectors most at risk of OCD. These results might help intervention policy in health and safety at work and allergy prevention. They also showed the effectiveness of preventative intervention on OCD, suggesting that RNV3P reporting scheme is useful in France to evaluate intervention policy in health and safety at work

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Beliauskienė, Aistė. "Dermatitu sergančių pacientų įsijautrinimo kontaktiniams alergenams ir su juo susijusių veiksnių tyrimas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120214_092202-76017.

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Darbo tikslas – įvertinti dermatitu sergančių pacientų įsijautrinimą kontaktiniams alergenams ir su juo susijusius veiksnius. Darbo uždaviniai: 1. Nustatyti įsijautrinimo kontaktiniams alergenams dažnumą tarp dermatitu sergančių pacientų. 2. Įvertinti įsijautrinimo kontaktiniams alergenams dažnumo sąsajas su tiriamųjų amžiumi, lytimi ir profesija. 3. Nustatyti įsijautrinimo kontaktiniams alergenams klinikos ypatumus. 4. Įvertinti įsijautrinimo kontaktiniams alergenams sąsajas su atopiniu dermatitu, lėtine (-ėmis) kojos (-ų) opa (-omis) ir kitais veiksniais. Išvados: 1. Kontaktiniams alergenams įsijautrinę pusė dermatitu sergančių pacientų, dažniausiai – metalui nikeliui (17,1 proc.). Iš aromatinių medžiagų dažniausias yra įsijautrinimas Peru balzamui (8 proc.). Į pagrindinį alergenų rinkinį neįtrauktini retai (0,1 proc.) nustatyti alergenai: gumų medžiagos merkaptobenzotiazolas ir N-zopropil-N’-fenil-parafenilendiaminas. 2. Įsijautrinimas kontaktiniams alergenams jaunesniems nei 40 metų dermatitu sergantiems pacientams pasireiškia du kartus dažniau nei vyresniems, o moterims – du kartus dažniau nei vyrams. Žemės ūkio ir miškininkystės darbuotojai kontaktiniams alergenams įsijautrinę tris kartus dažniau nei kiti dirbantieji. Vertinant atskirus alergenus, jaunesni nei 40 metų pacientai dažniau nei vyresni yra įsijautrinę nikeliui, kobaltui ir kvaterniumui-15, o 40 metų ir vyresni – Peru balzamui, kanifolijai, aromatų mišiniui I, lanolinui, seskviterpenlaktonams ir... [toliau žr. visą tekstą]
The aim of the study: To evaluate contact sensitization and its associated factors in patients with dermatitis. The objectives of the study: 1. To determine the frequency of sensitization to contact allergens in patients with dermatitis. 2. To evaluate associations between the frequency of sensitization to contact allergens and age, sex and occupation in patients with dermatitis. 3. To determine clinical features of contact sensitization. 4. To evaluate associations between sensitization to contact allergens and atopic dermatitis, chronic leg ulcers and other factors. CONCLUSIONS 1.Half of the patients with dermatitis were sensitized to contact allergens, most frequently to metal nickel (17.1%). From the fragrances, bal¬sam of Peru was the most frequent contact allergen (8%). Rare allergens that should not be included in the baseline series are the substances present in the composition of rubber – mercaptobenzothiazole and N-isopropyl-N'-phenyl-p-phenylene diamine (IPPD). 2.Patients under 40 years of age are two times more frequently sensitized than the older ones. In women contact allergy is twice as more frequent as in men. Agricultural and forestry workers are sensitized to contact allergens three times as more often as other employees. What regards individual allergens, among patients under 40 years of age sensitization to nickel, cobalt and quaternium-15 is more prevalent than in the older ones. Among patients who are 40 years of age and over contact sensitization to... [to full text]

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Gentry, Retha D., Lisa Ousley, and Candice N. Short. "Nickel Allergic Contact Dermatitis: A Case Report." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/7159.

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A 22-year-old male college student presented to primary care with a pruritic rash on his mid abdomen for the past 2 weeks. He reported mild to moderate pruritus and had been scratching the area above his belt buckle.

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Mikulowska, Anna. "The human langerhans cell in irritant contact dermatitis." Lund : Dept. of Medical Cell Research, Lund University, 1994. http://catalog.hathitrust.org/api/volumes/oclc/39693813.html.

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9

Kuzmina, Natalia. "Biophysical aspects of contact dermatitis and its prevention /." Stockholm, 2004. http://diss.kib.ki.se/2004/91-7349-767-3/.

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10

Spriggs, Sandrine. "The role of glutathione in Allergic Contact Dermatitis." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3012684/.

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Allergic Contact Dermatitis is a skin condition that affects up to twenty percent of the North American and Western European population. The molecular initiating event (MIE) of this type IV delayed hypersensitivity is the formation of antigenic species by covalent modification of endogenous proteins. Cysteine residues, though not the most prevalent residues in skin proteins, are prone to react with small electrophilic molecules and thus play a crucial role in protein haptenation. The role of cysteine is also very prominent in removal of electrophiles. Glutathione (GSH) is the most prominent antioxidant in cells and contains a cysteine residue, providing a free reactive thiol for GSH conjugation of electrophiles and their subsequent removal. It is also the co-factor of an important set of enzymes involved in the metabolic clearance system, glutathione S-transferases (GST). However, it remains unclear whether the reactivity of small exogenous electrophiles with intracellular GSH could be a key factor in determining the epidermal bioavailability of sensitising chemicals. GST activity has been demonstrated both in skin and in most in vitro skin equivalents but so far studies have focussed on specific chemical clearance. The GSH cycle (synthesis, conjugation, recycling) has not been comprehensively studied in the HaCaT cell line, which is often used as a surrogate model for human skin. We showed that the model sensitisers 2,4-dinitrohalobenzenes, reacting with thiols via a SNAr mechanism, depleted intracellular GSH within the first hour of exposure in HaCaT cells, in a dose dependent manner. Synthesis of de novo GSH was investigated 24 hours after treatment with a single non-toxic dose of 10 μM of three dinitrohalobenzenes. GSH concentration was found similar or slightly higher than the level measured in control cells for 1-chloro-2,4-dinitrobenzene (DNCB) and 1-fluoro-2,4-dinitrobenzene (DNFB) but not for 1- bromo-2,4-dinitrobenzene (DNBB), which appeared to partially prevent GSH repletion. This data inferred that the repletion step was the differentiating factor between chemicals belonging to the same reactivity domain. The toxicity of the halogen released in the cells was most likely the reason for observing these differences and this might have been missed if only the clearance kinetics were investigated. Activation of the nuclear factor E2-related factor 2 (Nrf2) pathway was concomitantly observed for all compounds within two hours, and at concentrations less than 10 μM. Nrf2 activation is the precursor event for the overproduction of Phase II metabolic enzymes such as GSTs, enzymes involved in the synthesis of GSH such as Glutamyl cysteine ligase (GCL) and Glutathione synthetase (GS) as well as GSH related enzymes acting against oxidative stress such as Glutathione Reductase (GR). HaCaT cells treated with the model aldehydes benzaldehyde and phenylacetaldehyde, which oxidised cysteine residues in chemico, did not suffer a significant depletion of GSH levels at sub-toxic concentrations. In addition, these aldehydes have been shown to react with amines via a Schiff base mechanism to form stable protein adducts. Our set of data indicated that the Schiff base mechanism was most probably favoured and that an oxidation of GSH (a reduction of the GSH:GSSG ratio), was effectively and rapidly controlled by GR activity. The volatility of aldehydes was likely to limit the bioavailability of these compounds intracellularly, possibly increasing the probability of haptenation with cell membrane proteins. Skin sensitisers are often defined by their potency (ranging from extreme to non-sensitising) rather than their chemical reactivity domain. We compared the clearance of two extreme sensitisers by the GSH pathway: DNCB and diphenylcyclopropenone (DPCP). We demonstrated that two chemicals able to react with thiols in chemico via different mechanisms (SNAr for DNCB and Michael addition for DPCP) were affecting GSH levels differently in HaCaT cells. DNCB induced GSH depletion at non-toxic concentrations, while exposure to DPCP decreased cell viability at concentrations for which GSH stock was not significantly reduced. DPCP reactivity with thiols has been suggested in cell membranes. Contrary to the results obtained for DPCP, diethyl maleate (DEM), a moderate sensitiser also reacting via Michael addition, was cleared by GSH at a rate similar to the rate of de novo GSH synthesis, masking the overall depletion of GSH. Exposure to DEM induced an overproduction of GSH after 24 hours that was more pronounced than the one observed for the more potent sensitiser DNCB, showing that the sensitising potency of chemicals could not be correlated solely to the ability to be conjugated by GSH (i.e. weak sensitisers would be cleared rapidly while potent sensitisers would not). These experiments demonstrated that the defence mechanisms in the HaCaT cell line were providing a rapid response to chemical stress. To investigate the effects of chemical exposure on GSH lifecycle in reconstructed human epidermis (RHE), we attempted repeated cycles of 2 hour exposure to DNCB over a week long period. For three consecutive treatments, each exposure to DNCB led to GSH depletion. Replenishment to basal level was observed after a 22 hour recovery period. Accumulation of Nrf2 in the cytosol also occurred within the two hours of exposure to DNCB but returned to baseline during each recovery period. The amount of GSH conjugate formed (dinitrophenyl glutathione) increased after each exposure, suggesting that the metabolic capacity of skin may be enhanced in response to exposure to exogenous compounds. In conclusion, the GSH cycle is fully active in skin and participates in the clearance of some exogenous compounds with electrophilic properties. GSH skin metabolism can also potentially be enhanced after repeated exposures to small quantities of electrophiles. Future risk assessments for skin sensitisation potential of topically applied chemicals could integrate these findings to correlate more realistically to in vivo scenarios.

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Lee, Tze-yuen. "Studies on contact dermatitis in Hong Kong : epidemiology and traditional chinese medicine /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14023829.

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Silvestre, Marilene Chaves. "Avaliação da dermatite de contato alérgica ao níquel através da técnica de imuno-histoquímica." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/5/5133/tde-09082017-103915/.

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A dermatite de contato alérgica (DCA) ao íon níquel (Ni2+) é uma dermatose inflamatória frequente nos países industrializados. Envolve a ativação de células T específicas ao Ni2+, seguida da proliferação e indução de um perfil misto de citocinas, tanto pró-inflamatórias quanto reguladoras, sugerindo que vários subtipos de células T (helper - Th e citotóxica - Tc) estão envolvidos na resposta imune. Este estudo teve como objetivo a análise das citocinas TNF-alfa, INF-y, IL-2, IL-4, IL-10, IL-13, IL-17 e IL-23 pela técnica de imuno-histoquímica, para tentar identificar a prevalência de um ou mais subtipos de células T (Th/Tc), nos eczemas crônico e agudo de pacientes com DCA ao Ni2+. Avaliamos 20 pacientes (17 mulheres e 3 homens, com idade mediana de 46 anos) apresentando eczema crônico, pelo contato cotidiano do paciente com o Ni2+. Foram coletadas duas biópsias de pele em cada um dos 20 pacientes, a primeira no local do eczema crônico ao Ni2+, antes da aplicação do teste de contato (TC); e a segunda no local do eczema agudo, provocado pelo TC com o sulfato de níquel, 48 horas após sua fixação, nas leituras positivo forte (++) ou positivo muito forte (+++). Foram 160 amostras de eczema agudo e 160 de eczema crônico, perfazendo um total de 320 amostras. Apenas três amostras foram excluídas devido a algum tipo de falha técnica, como, por exemplo, o descolamento dos cortes de pele da lâmina. Para a análise dos dados utilizou-se o software estatístico STATA versão 13. As amostras coradas revelaram resultados positivos para as oito citocinas estudadas, e estas apresentaram valores heterogêneos. Esta heterogeneidade foi medida pelo coeficiente de variação, indicando a variabilidade do conjunto dos dados obtidos. O TNF-alfa, IFN-y, IL-4, IL-13 e IL-17 tiveram prevalência maior no eczema crônico do que no eczema agudo, a IL-2 e IL-23 apresentaram maior prevalência no eczema agudo, em comparação com o eczema crônico e a IL-10 apresentou prevalência similar tanto no eczema agudo quanto no crônico, porém, estas prevalências foram muito baixas, em ambos os eczemas. O TNF-alfa foi a citocina que mais prevaleceu no eczema crônico e a IL-2 foi a mais prevalente no eczema agudo. Porém, estas prevalências foram estatisticamente significantes apenas para a IL-4 e IL-13. Verificamos, nos eczemas crônico e agudo, a presença de um perfil misto de citocinas dos subtipos de células T (Th/Tc), sugerindo que as respostas imunes são expressas ao mesmo tempo. Entretanto, são necessários mais estudos para uma compreensão mais ampla sobre o perfil das citocinas na DCA ao Ni2+, o que poderia levar a novas abordagens terapêuticas
Allergic contact dermatitis (ACD) to nickel (Ni+2) is a inflammatory dermatosis, common in industrialized countries. It involves the activation of nickel-specific T cells, followed by the proliferation and induction of a mixed profile of both proinflammatory and regulatory cytokines, suggesting that several T cell subtypes (helper - Th and cytotoxic - Tc) are involved in the immune response. This study aimed to analyze the cytokines TNF-alfa, INF-y, IL-2, IL-4, IL-10, IL-13, IL-17 and IL-23 using the immunohistochemistry technique in order to try to identify the prevalence of one or more T cell subtypes (Th/Tc) in the chronic and acute eczema of patients with ACD to Ni+2. We evaluated 20 patients (17 women and 3 men, median age of 46 years) with chronic eczema, by the patient\'s daily contact with Ni+2. Two skin biopsies were collected in each of the 20 patients, the first at the site of the chronic eczema to Ni+2, prior to the application of the contact test (CT); and the second at the site of acute eczema caused by CT with nickel sulphate, 48 hours after its fixation in the strong positive (++) or very strong positive (+++) readings. There were 160 samples of acute eczema and 160 of chronic eczema, a total of 320 samples. Only three samples were excluded due to some kind of technical failure, such as detachment of the skin cuts from the microscope slide. Statistical software STATA version 13 was used to analyze the data. The stained samples showed positive results for the eight cytokines studied, and these presented heterogeneous values. This heterogeneity was measured by the coefficient of variation, indicating the variability of the data set obtained. TNF-alfa, IFN-y, IL-4, IL-13 and IL-17 had a higher prevalence in chronic eczema than in acute eczema, IL-2 and IL-23 were more prevalent in acute eczema compared to chronic eczema and IL-10 presented similar prevalence in both acute and chronic eczema, however, a very low prevalence in both eczema. TNF-alfa was the most prevalent cytokine in chronic eczema and IL-2 was the most prevalent in acute eczema. However, these prevalences were statistically significant only for IL-4 and IL-13. In chronic and acute eczema, we observed the presence of a mixed cytokine profile of the T cell subtypes (Th/Tc), suggesting that immune responses are expressed at the same time. However, further studies are needed for a broader understanding of the cytokine profile in ACD to Ni+2, which could lead to new therapeutic approaches

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Kobata, Clarice Marie. "Testes de contato em crianças com eczema." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/5/5133/tde-20092010-171934/.

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Introdução: Eczemas são manifestações inflamatórias da pele. Na infância se destacam a dermatite atópica (DA) e a dermatite de contato (DC). Os testes de contato correspondem a um método auxiliar para diferenciar a dermatite de contato por irritante primário (DCIP) da dermatite de contato alérgica (DCA) e definir a etiologia da DCA. Nos pacientes com DA, têm a faculdade de também auxiliar na identificação de substâncias que possam estar contribuindo para a piora do quadro. Objetivos: verificar a frequência de testes de contato positivos em crianças com hipóteses diagnósticas de DC e de DA associada ou não à DC; obter os principais sensibilizantes nessa faixa etária e comparar os dados obtidos entre os grupos de pacientes com DC e DA. Métodos: Durante o período entre julho de 2007 e agosto de 2009, 62 crianças com idades entre 2 e 12 anos foram submetidas aos testes de contato com a bateria padrão e/ou bateria de cosméticos de testes de contato padronizadas pelo Grupo Brasileiro de Estudos em Dermatite de Contato. As leituras foram realizadas em 48 e 96 horas. Resultados: Entre os 62 pacientes submetidos aos testes de contato, 38 pacientes apresentaram pelo menos um teste de contato positivo e 24, todos negativos. Entre os 44 pacientes com hipótese diagnóstica inicial de DA, 19 tinham DA associada à DCA. Entre os 18 pacientes com hipótese diagnóstica inicial de DC, 12 apresentavam DCA. No total, foram encontrados 76 testes positivos, sendo 53 (70%) relevantes, e 23 (30%) não relevantes com a história clínica do paciente. Os pacientes com DA apresentaram mais testes positivos não relevantes do que os pacientes com hipótese diagnóstica apenas de DC, e essa diferença foi estatisticamente significativa.( 2 = 6,55 e p = 0,01 ). Considerando os testes relevantes com a história clínica, o sulfato de níquel foi o principal sensibilizante com 14 (22,6%) testes positivos, a neomicina foi o segundo sensibilizante mais comum com sete testes positivos (11,3%), e a terceira substância mais comum foi o cloreto de cobalto com quatro (6,4%) testes positivos. Testes não relevantes foram encontrados em 30% do total de substâncias com testes positivos. O timerosol foi positivo em 11 casos, porém em oito pacientes com DA não foram relevantes com a história clínica. Conclusões: Pacientes na faixa etária entre 2 e 12 anos com DA e DC apresentaram testes de contato positivos, e não houve diferenças quanto à frequência dos testes positivos entre esses dois grupos. Os principais sensibilizantes relevantes com a história clínica foram o sulfato de níquel, a neomicina e o cloreto de cobalto, o que está de acordo com vários estudos na literatura. Pacientes com DA apresentaram mais testes falso-positivos que os pacientes com DC, possivelmente por um defeito da barreira cutânea dos pacientes com DA, e maior exposição precoce aos medicamentos tópicos ou emolientes para o controle da DA. Teste de contato em crianças pode ser considerado importante ferramenta para auxiliar no diagnóstico dos eczemas, identificando o agente causador da DC ou de piora nos casos de DA, e deve ser levado em conta em todos esses pacientes
Eczema is a cutaneous inflammatory manifestation in some dermatosis. In children, we highlight atopic dermatitis (AD) and contact dermatitis (CD). Patch tests help to differentiate irritative contact dermatitis (ICD) from allergic contact dermatitis (ACD), and define the etiology of allergic contact dermatitis. In patients with AD, it may also help to identify substances that may contribute to the worsening of this dermatosis. Objectives: To determine the frequency of positive patch tests in children with diagnosis of CD and AD with or without CD; to detect the main sensitizers in this group and compare the results between the groups of patients with CD and AD. Methods: From July 2007 to August 2009, 62 children aged between 2 to 12 years old were patch tested with the Brazilian standard battery of patch tests and cosmetic series. The readings were taken at 48 and 96 hours. Results: Thirty-eight patients had at least one positive patch test reactions and 24, all negative. Among the 44 patients with initial diagnosis of AD, 19 were associated with ACD. Among the 18 patients with initial diagnosis of CD, 12 had ACD. In total, there were 76 positive tests, 53 (70%) relevant, and 23 (30%) not relevant to the patient\'s clinical history. Patients with AD showed more positive tests not relevant than patients with diagnosis of CD only, and this difference was statistically significant. (2 = 6.55 and p = 0.01). Considering the relevant tests, nickel sulphate was the main allergen with 14 (22.6%) positive tests, neomycin was the second with seven positive tests (11.3%), and the third substance was cobalt chloride with four (6.4%) positive tests. Tests not relevant were found in 30% of the total of the positive tests. Thimerosol was positive in 11 cases, but in eight patients with AD were not relevant to the clinical history. Conclusions Patients aged between 2 to 12 years old with AD and CD had positive tests, and there were no differences in the frequency of positive tests between these two groups. The main sensitizers, relevant to the clinical history were nickel sulfate, neomycin and cobalt chloride. This result is consistent with several studies in the literature. Patients with AD showed more false-positive tests than patients with CD, possibly due to a defective skin barrier of AD patients, and earlier exposure to topical emollients and treatments for the control of AD. Patch test in children can be considered an important tool for the diagnosis of eczema, identifying the causative agent of CD or worsening cases of AD, and should be performed in all these patients. The correct interpretation of the patch tests is essential to evaluate the association of ACD in patients with AD and to identify the causative agent of the ACD

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Tsuji, Monique Cotarelli. "Dermatites de contato em indivíduos expostos a alisantes capilares contendo formaldeído identificados por reação química." Botucatu, 2020. http://hdl.handle.net/11449/192407.

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Orientador: Jaime Olbrich Neto
Resumo: Os cabelos são um importante componente de identidade social e sedução, favorece o mercado de cosméticos, notadamente o capilar, que busca inovações e novidades destinadas a obter um resultado desejado. Mulheres e homens dão importância para a saúde e aparência dos mesmos, empenhando cuidados que vão além dos habituais de higiene. A procura pelo cabelo ideal expõe a riscos de doenças, tanto os profissionais dos salões de beleza e como seus clientes. São doenças ocupacionais, em muitos casos, negligenciadas. Entre estes riscos encontra-se a dermatite de contato. No Brasil, a chamada escova progressiva é a mais conhecida e utilizada para alisamento. Neste processo o uso de formaldeído (FA) em concentrações não permitidas tem sido prática comum, expondo cabeleireiros e clientes a risco de doenças relacionadas ao contato com FA. O FA é permitido na concentração de até 0,2% como conservante de produtos. O presente estudo objetivou avaliar indivíduos expostos ao FA ao realizarem alisamento capilar, se estavam sensibilizados ao FA. Para identificar FA em produtos de alisamento capilar, usado pelos cabeleireiros participantes desta pesquisa, utilizou-se um kit comercialmente disponível. Foram incluídos profissionais expostos ao FA, clientes (esporadicamente expostos) e indivíduos nunca expostos. Foram realizados patch teste com a bateria brasileira para dermatite de contato, e um participante apresentou teste cutâneo positivo para formol, onze para bicromato de potássio e oito para s... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Hair is an important component of social identity and seduction, it favors the cosmetics market, notably the capillary, which seeks innovations and novelties designed to obtain a desired result. Women and men give importance to their health and appearance, engaging in care that goes beyond the usual hygiene. The search for the ideal hair exposes the risks of diseases, both the professionals of the beauty salons and their clients. Occupational diseases that are, in many cases, neglected. Contact dermatites is one of the risks. In Brazil, the so-called brazilian hair straightening is the preferred for straightening. In this process, the use of formaldehyde (FA) in unallowed concentrations has been common practice, exposing hairdressers and clients to the risk of diseases related to contact with FA. At a concentration of up to 0.2%, as a p preservative, FA is permitted. The present study aimed to evaluate individuals exposed to FA when performing hair straightening, and if they were sensitized to FA. To identify FA in hair straightening products, used by hairdressers participating in this research, a commercially available kit was used. Professionals exposed to the FA, clients (sporadically exposed) and individuals never exposed were included. Patch tests were performed with the Brazilian battery for contact dermatitis, and one participant presented a positive skin test for formaldehyde, eleven for potassium bichromate and eight for nickel sulfate. Clinical symptoms were more se... (Complete abstract click electronic access below)
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15

Färm, Gunilla. "Contact allergy to colophony : clinical and experimental studies with emphasis on clinical relevance /." Stockholm, 1997. http://www.kibic.ki.se/ki/diss/971107farm.html.

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Ponting, David John. "Computational studies towards the prediction of skin sensitization." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648622.

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17

Memon, Aamir Aziz. "Investigation of cellular and clinical aspects of allergic contact dermatitis." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309918.

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Gendrisch, Fabian [Verfasser], and Stefan F. [Akademischer Betreuer] Martin. "The role of endoplasmic reticulum stress responses in contact dermatitis." Freiburg : Universität, 2018. http://d-nb.info/1211956318/34.

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Smith, Harvey Ronald. "Human cutaneous irritant thersholds : validity, variability and relationship to contact dermatitis." Thesis, King's College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407340.

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20

El-Nour, Husameldin. "Study of serotonin, innervation and sensory neuropeptides in allergic contact dermatitis /." Stockholm, 2005. http://diss.kib.ki.se/2005/91-7140-464-3/.

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McFadden, John. "Clinical and experimental aspects of allergic contact dermatitis to para-phenylenediamine." Thesis, University of Southampton, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.536290.

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22

Everness, Katharine Mary. "Allergic contact dermatitis to nickel : a study of antigen presentation in vitro." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/18869.

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23

Bondesson, Lundeberg Lena. "Interaction between the nervous and immune systems in allergic contact dermatitis : a clinical and experimental study with emphasis on the role of VIP and serotonin /." Stockholm, 1998. http://diss.kib.ki.se/search/diss.se.cfm?19980611bond.

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Brum, Liliani Mathias. "ATIVIDADE DA NTPDase DE LINFÓCITOS NA DERMATITE DE CONTATO ANTES E APÓS TRATAMENTO COM DEXAMETASONA NANOESTRUTURADA." Universidade Franciscana, 2008. http://tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/235.

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Анотація:

Made available in DSpace on 2018-06-27T18:56:21Z (GMT). No. of bitstreams: 2 Liliani Mathias Brum.pdf: 1503888 bytes, checksum: ad2eacb7dc98b3e5fbf2604c9ae82084 (MD5) Liliani Mathias Brum.pdf.jpg: 3065 bytes, checksum: 9adf1c37fd40ed3180ec5d7ac9fc8754 (MD5) Previous issue date: 2008-09-18
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Since the extracellular nucleotides represent an important means of modulating the activity of lymphocytes, it is essential the presence of an enzymatic mechanism to keep constant the concentration of those in the extracellular space. The activity of NTPDase has been recognized as a marker of activation necessary for the function of effector lymphocytes, participate in the processes of recognition of antigen. Contact dermatitis occurs in a delayed hypersensitivity reaction of type IV, mediated by cells through a mechanism that sensitizes the immune T lymphocyte to an antigen protein or a hapten linked to a protein. Among the mediators able to modulate the actions of lymphocytes stand out from the nucleoside and nucleotide adenine, in particular the extracellular ATP that is able to regulate the cell-cell interactions are important processes of activation, differentiation, development, proliferation, cell death and responses of effector lymphocytes. This study sought to determine first of the hydrolysis of adenine nucleotides, the NTPDase (EC 3.6.1.5, nucleoside triphosphate difosfoidrolase, CD39) in lymphocytes from mice with dermatitis induced by nickel sulphate to 5%, before and after treatment with dexamethasone and dexamethasone nanostructured free to try to check the possible changes in the activity of this enzyme front of an inflammatory reaction of type IV hypersensitivity and immunosuppressive therapy. Moreover, it was possible to verify the relationship of submission of the drug in the formulation free and nanostructures with the hydrolysis of adenine nucleotides. The average enzymatic activity of the group with contact dermatitis was significantly higher in the control group by the test of hypotheses to averages T. The results are in line with work done earlier that showed an increase of enzyme activity by the activation of lymphocytes. The hydrolysis of ATP and ADP in the group treated with dexamethasone free and in the group treated with dexamethasone nanostructured was significantly higher in the control group by analysis of variance for a way (ANOVA) followed by Kruskal-Wallis test (P < 0001). The results are in line with work done earlier that showed an increase of enzyme activity by the activation of lymphocytes. Was observed greater hydrolysis of ATP and ADP in the group treated with dexamethasone nanostructures in relation to the group treated with dexamethasone free. However, this difference was not statistically significant. Work previously shown an increase of enzyme activity during treatment with dexamethasone as a possible compensatory effect of the decrease in the number of lymphocytes. The results of this study suggest that dexamethasone nanostructures possess a immunosuppressive effects greatest, which may be the beginning of the evaluation of a more effective and safe treatment for contact dermatitis. From these results we can conclude that the determination of the activity of NTPDase in lymphocytes could be used as an indicator of the efficiency of the treatment of contact dermatitis
Uma vez que os nucleotídeos extracelulares representam uma importante via de modulação da atividade dos linfócitos, é indispensável a presença de um mecanismo enzimático capaz de manter constante a concentração desses no espaço extracelular. A atividade da NTPDase tem sido reconhecida como um marcador de ativação necessário para a função efetora dos linfócitos, participando também dos processos de reconhecimento do antígeno. Na dermatite de contato ocorre uma reação de hipersensibilidade retardada tipo IV, mediada por células, através de um mecanismo imunológico que sensibiliza os linfócitos T frente a um antígeno protéico ou a um hapteno ligado a uma proteína. Dentre os mediadores capazes de modular as ações dos linfócitos destacam-se os nucleosídeos e nucleotídeos da adenina, em especial o ATP extracelular que é capaz de regular as interações célula-célula sendo importante nos processos de ativação, diferenciação, desenvolvimento, proliferação, morte celular e respostas efetoras dos linfócitos. Este estudo procurou determinar primeiramente a hidrólise de nucleotídeos da adenina, pela NTPDase (EC 3.6.1.5, nucleosídeo trifosfato difosfoidrolase, CD39) em linfócitos de ratos com dermatite induzida por sulfato de níquel, antes e após tratamento com dexametasona livre e dexametasona nanoestruturada, para tentar verificar as possíveis alterações na atividade desta enzima frente a uma reação inflamatória de hipersensibilidade tipo IV e na terapia imunossupressora. Além disso, procurou-se verificar a possível relação da apresentação do fármaco na formulação livre e nanoestruturada com a hidrólise de nucleotídeos da adenina. A atividade enzimática média do grupo com dermatite de contato foi significativamente maior em relação ao grupo controle pelo teste de hipóteses para médias T. Os resultados encontrados estão de acordo com trabalhos realizados anteriormente que demonstram um aumento da atividade enzimática pela ativação dos linfócitos. A hidrólise do ATP e do ADP no grupo tratado com dexametasona livre e no grupo tratado com dexametasona nanoestruturada foi significativamente maior em relação ao grupo controle pelo teste de análise de variância de uma via (ANOVA) seguido pelo teste de Kruskal-Wallis (P< 0,001). Observou-se uma maior hidrólise de ADP e ATP, no grupo tratado com dexametasona nanoestruturada em relação ao grupo tratado com dexametasona livre. No entanto, esta diferença não foi estatisticamente significativa. Trabalhos anteriores já demonstraram um aumento de atividade enzimática durante tratamento com dexametasona como um possível efeito compensatório à diminuição do número de linfócitos. Os resultados deste estudo sugerem que a dexametasona nanoestruturada possui um efeito imunossupressor maior, o que pode ser o início da avaliação de um tratamento mais eficaz e seguro para a dermatite de contato. A partir destes resultados podemos concluir que a determinação da atividade da NTPDase em linfócitos poderia ser utilizada como um indicador da eficiência da terapêutica da dermatite de contato.

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Lee, Tze-yuen, and 李梓源. "Studies on contact dermatitis in Hong Kong: epidemiology and traditional chinese medicine." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31981598.

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Al-Amri, Mohammad Abdulla. "Atopic dermatitis : the role of contact allergy in disease and disease exacerbations." Thesis, King's College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274922.

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27

Nyrén, Miruna. "Skin sensitivity testing : a biophysical approach /." Stockholm, 2002. http://diss.kib.ki.se/2002/91-7349-173-X.

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28

Behroozy, Ali. "Validation of a monitor to measure exposure to wet-work." Thesis, University of Aberdeen, 2011. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165821.

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Wet-work exposure has been recognized as a main risk factor for developing Irritant contact dermatitis of the hand. Duration and frequency of wet-work exposure are the key risk determinants, but there is still no reliable objective method to assess these factors in the workplace. The current study aimed to further validate a newly invented wet-work exposure monitor (WWEM) among four high risk occupational groups of hairdressers, florists, caterers and nurses. The WWEM, which consists of two similar thermocouples provides a real-time indication of the wetness of the finger by measuring the temperature changes when the finger is wet and subsequent cooling when the water evaporates from the skin. A suitable data analysis routine was constructed and direct observation was employed as the gold standard. Receiver Operating Characteristic (ROC) analysis was used to compare the results. In laboratory experiments, the most suitable wet-event threshold value, as a criterion to distinguish the wet and dry exposure periods was identified as 1.6°C (Mean+5SD of the “dry” data). Using this value sensitivity and specificity were 70% and 78%, respectively. An area under the curve (AUC) of 0.78 demonstrated a “high” accuracy for WWEM in lab experiments. Field testing in real occupational fields identified varying degrees of user acceptability and different wet-event threshold values to produce maximal sensitivity and specificity of the instrument. Among hairdressers, the WWEM showed a “moderate” accuracy at the threshold value of 1.37°C with an AUC of 0.62. For florists, the most suitable threshold value in the range of examined thresholds was 1.14°C with a “good” accuracy. Among a cohort of caterers, a threshold value of 1.6°C demonstrated a “hi gh” accuracy with an AUC of 0.72. The WWEM demonstrates the minimum value of the largest AUC for nurses. This is the minimum amount of accuracy among the four occupational groups. The figure is 0.52, achieved at a threshold value of 2.5°C. The WWEM enables the frequency and duration of wet-work exposure to be assessed in an objective manner rather than the current costly and unreliable subjective methods of direct observation and questionnaire. The results indicate that the WWEM has good sensitivity and high specificity in detecting exposure to wet-work. This device provides new experimental data on wetwork exposure and may be used in future as an educational tool to highlight the importance of wet-work exposure to both employees and employers.

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Sjögren, Florence. "Dermal cell trafficking : from microscopy to microdialysis /." Linköping : Univ, 2005. http://www.bibl.liu.se/liupubl/disp/disp2005/med883s.pdf.

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30

Warner, Ronald Douglass. "Zinc and calcium effects on nickel dermatitis in the guinea pig /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487330761217158.

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Little, Matthew Clifford. "The role of the keratinocyte in nickel- and chromium- induced allergic contact dermatitis." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267124.

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Davis, Jennifer A. "Role of TNF-alpha polymorphism -308 in Irritant Contact Dermatitis and Neurosensory Response." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1267453650.

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Davis, Jennifer AlClaytese. "Role of TNF-[alpha] polymorphism -308 in irritant contact dermatitis and neurosensory response." Cincinnati, Ohio : University of Cincinnati, 2009. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1267453650.

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Thesis (Ph.D.)--University of Cincinnati, 2009.
Advisor: R. Randall Wickett. Title from electronic thesis title page (viewed Apr. 19, 2010). Keywords: TNF-alpha polymorphism -308; Irritant Contact Dermatitis; Neurosensory Irritation; Healthcare workers; Hand hygiene; Lactic Acid Sting Test. Includes abstract. Includes bibliographical references.

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Mesquita, Ísis Fiorello de Oliveira. "Teste alérgico de contato nos portadores de úlceras crônicas de membros inferiores." Botucatu, 2019. http://hdl.handle.net/11449/191155.

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Orientador: Luciana Patrícia Fernandes Abbade
Resumo: Introdução: Úlceras crônicas de membros inferiores são muito prevalentes. O tratamento local é feito através do uso de curativos específicos e outros produtos tópicos. A utilização destes podem causar dermatite de contato alérgica, aumentando a morbidade relacionada à doença e retardo da cicatrização. Objetivos: Identificar a frequência e principais substâncias alergênicas relacionadas à dermatite de contato nos pacientes portadores de úlceras crônicas nos membros inferiores. Métodos: Estudo observacional, com desenho transversal, realizado em 64 pacientes com diagnóstico de úlcera crônica de membros inferiores ativa ou cicatrizada independente da etiologia. Em todos os participantes foi realizado o teste de contato com a bateria padrão e com os curativos e produtos frequentemente utilizados para tratamento destas úlceras. Foram avaliadas variáveis clínicas e as relacionadas ao teste de contato. Resultados: Eczema peri-úlcera estava presente em 50 pacientes (78,1%). O teste de contato padrão foi positivo em 28 participantes (43,8%), sendo o paraben mix, sulfato de níquel e lanolina as substâncias do teste padrão que mais positivaram. O teste de contato com os curativos e produtos foi positivo em 17 participantes (25,6%) e os principais alérgenos foram, em ordem decrescente: colagenase com cloranfenicol (16%), sulfadiazina de prata (13%) e bota de Unna (6%). Eczema peri-úlcera relacionou-se positivamente com o uso de colagenase e hidratantes. Conclusão: A positividade ao teste... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Introduction: Chronic leg ulcers are very prevalent and the local treatment is done through the use of specific dressings and other topical products. The use of these can cause allergic contact dermatitis, increasing disease-related morbidity and delayed healing. Objective: To identify the frequency and the main allergenic substances related to contact dermatitis in patients with chronic leg ulcers. Methodology: Observational study, with transversal design, performed with 64 patients diagnosed with active or healed chronic leg ulcers regardless of etiology were included. Patch tests were performed with all the patients, including the standard battery and the dressings and products frequently used on the treatment. Clinical variables and those related to the patch test were evaluated. Results: Peri-wound eczema was present in 50 patients (78.1%). The standard patch test was positive in 28 (43.8%) participants, with paraben mix, nickel sulfate and lanolin being the most positive substances. The patch test with dressings and products was positive in 17 (25.6%) participants and the main allergens were, in decreasing order: collagenase with chloramphenicol (16%), silver sulfadiazine (13%) and Unna's boot (6%). Peri-wound eczema was positively related to the use of collagenase and moisturizers. Conclusion: Positive patch test in patients with chronic leg ulcers is still high and peri-wound eczema, an important comorbidity that delays healing, is at increased risk in patients using ... (Complete abstract click electronic access below)
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35

Cheung, Connie Tsui-Ping. "Expression and localisation of cutaneous alcohol and aldehyde metabolising enzymes." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342325.

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Newby, Craig Sinclair. "The pro-inflammatory effects of phenols on the skin." Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314177.

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37

Nakashima, Chisa. "Basophils regulate the recruitment of eosinophils in a murine model of irritant contact dermatitis." Kyoto University, 2014. http://hdl.handle.net/2433/189666.

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Muteba, Itone. "Research on nickel alloy sensitivity." Title page, Contents and Abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09DM/09dmm992.pdf.

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"April 1999." Includes bibliographical references (leaves 46-51). Aims to collect information about the numbers of dental workers who are sensitive or allergic to nickel and to help identify signs which might predict those people who are most likely to be sensitive to nickel. Uses a standard patch test to identify sensitive subjects.

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Pope, Victoria, and Lisa Ousley. "Irritant Contact Dermatitis Caused by Hand Sanitizer Use and Handwashing During the COVID-19 Pandemic." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/etsu-works/7141.

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Kannanayakal, Thomas Joseph. "Inflammatory Cytokines in Jet Propulsion Fuel-8 Induced Irritant Contact Dermatitis in Male Fischer Rats." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1242168249.

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Bråred, Christensson Johanna. "Clinical and experimental studies on oxidized fragrance terpenes as contact allergens /." Göteborg : Department of Dermatology and Venereology, Sahlgrenska University Hospital, Institute of Clinical Sciences at Sahlgrenska Academy, University of Gothenburg, 2009. http://hdl.handle.net/2077/19052.

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Pinnagoda, Jaliya. "Transepidermal water loss : its role in the assessment of susceptibility to the development of irritant contact dermatitis." Thesis, University of London, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339788.

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Ferreira, Bruna Lapenna Sanches [UNESP]. "Associação da ocorrência do Ectima Contagioso (Orf vírus) em ovinos com seus cuidadores." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/140229.

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Made available in DSpace on 2016-07-01T13:10:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-07-20. Added 1 bitstream(s) on 2016-07-01T13:14:09Z : No. of bitstreams: 1 000866054.pdf: 2314822 bytes, checksum: 66816c95a96a080131f37d0f44f49fbe (MD5)
Responsável por perdas econômicas significativas nos rebanhos afetados, o Ectima Contagioso é uma enfermidade causada pelo Orf vírus pertencente ao gênero Parapoxvirus, epiteliotrófico, da família Poxviridae e subfamília Chordopoxvirinae. Pode ser transmitida a humanos que manipulam e trabalham com ovinos infectados, causando lesões crostosas e proliferativas na pele e nas junções mucocutâneas, tanto em animais como em humanos. O estudo evidenciou a difusão da enfermidade no Estado de São Paulo. Foram amostrados 42 (8,64%) cuidadores de animais e 444 (91,36%) ovinos (n=486). Dentre estes, 453 (93,21%) não apresentaram sinais clínicos, enquanto que 33 (6,79%) casos suspeitos da doença (32 ovinos e um cuidador) que foram biopsiados e realizados os testes histopatológicos e de PCR. Deste total amostrado (n= 486), foram sugestivos para Ectima Contagioso 6,38% e 0,41% sugestivos para outras lesões de pele no exame histopatológico. No exame de PCR dentre os 486 amostrados, 4,32% foram positivas, enquanto 2,47% apresentaram resultado negativo. A prevalência de reagentes por virusneutralização foi de 67% nos ovinos e em seus cuidadores de 76% (p= 0,22). A distribuição dos títulos teve diferença estatística significativa entre as espécies com p = 0,0048. Todas as 486 amostras pesquisadas, foram negativas no exame de PCR do sangue. A prevalência de animais com crosta resultou em 7,2% e em seus cuidadores 2,4%. As análises estatísticas foram realizadas com o programa SAS (SAS Institute, 2011) em nível de significância de 0,05. Concluiu-se teste de virusneutralização no soro entre as espécies foi significativo estatisticamente (p = 0,048), com isso, sugere-se que quanto maior a convivência dos ovinos com seus cuidadores; a concordância entre os métodos diagnósticos de virusneutralização, PCR e histopatológico são importantes associações para o diagnóstico conclusivo da doença; a enfermidade está difundida no...
Responsible for significant economic losses in affected flocks, the Contagious Ecthyma is a disease caused by Orf virus belonging to the genus Parapoxvirus, epitheliotropic, the Poxviridae family and subfamily Chordopoxvirinae. It could be transmitted to humans who handle and work with infected sheep, causing crusted lesions and proliferative skin and the mucocutaneous junction, both in animals and in humans. The study showed the disease diffusion in São Paulo. They sampled 42 (8.64%) Animal caregivers and 444 (91.36%) sheep (n = 486). Of these, 453 (93.21%) showed no clinical signs, while 33 (6.79%) suspected cases of the disease (32 sheep and a caregiver) that were biopsied and performed histopathological and PCR tests. This all samples (n = 486) were suggestive of Ecthyma Contagious 6.38% and 0.41% suggestive of other skin lesions on histopathological examination. In examining PCR among 486 sampled, 4.32% were positive, while 2.47% were negative. The prevalence of reagents for virus neutralization was 67% in sheep and their caregivers 76% (p = 0.22). The distribution of titles had statistically significant differences between species with p = 0.0048. All surveyed 486 samples were negative in PCR test blood. The prevalence of animals with crust resulted in 7.2% and 2.4% their caregivers. Statistical analyzes were performed with SAS software (SAS Institute, 2011) at 0.05 significance level. Virus neutralization test in conclusion serum between species was statistically significant (p = 0.048), therefore, it is suggested that the higher the coexistence of sheep with their caregivers; the correlation between the diagnostic methods of virus neutralization, PCR and histopathology are important associations for the conclusive diagnosis of the disease; the disease is widespread in São Paulo and the geographical distribution did not influence the genetic similarity of the virus

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Ferreira, Bruna Lapenna Sanches. "Associação da ocorrência do Ectima Contagioso (Orf vírus) em ovinos com seus cuidadores /." Botucatu, 2015. http://hdl.handle.net/11449/140229.

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Orientador: Rafael Modolo
Coorientador: Cassiano Victoria
Banca: Simone Baldini Lucheis
Banca: Liria Hiromi Okuda
Banca: Claudia Del Fava
Resumo: Responsável por perdas econômicas significativas nos rebanhos afetados, o Ectima Contagioso é uma enfermidade causada pelo Orf vírus pertencente ao gênero Parapoxvirus, epiteliotrófico, da família Poxviridae e subfamília Chordopoxvirinae. Pode ser transmitida a humanos que manipulam e trabalham com ovinos infectados, causando lesões crostosas e proliferativas na pele e nas junções mucocutâneas, tanto em animais como em humanos. O estudo evidenciou a difusão da enfermidade no Estado de São Paulo. Foram amostrados 42 (8,64%) cuidadores de animais e 444 (91,36%) ovinos (n=486). Dentre estes, 453 (93,21%) não apresentaram sinais clínicos, enquanto que 33 (6,79%) casos suspeitos da doença (32 ovinos e um cuidador) que foram biopsiados e realizados os testes histopatológicos e de PCR. Deste total amostrado (n= 486), foram sugestivos para Ectima Contagioso 6,38% e 0,41% sugestivos para outras lesões de pele no exame histopatológico. No exame de PCR dentre os 486 amostrados, 4,32% foram positivas, enquanto 2,47% apresentaram resultado negativo. A prevalência de reagentes por virusneutralização foi de 67% nos ovinos e em seus cuidadores de 76% (p= 0,22). A distribuição dos títulos teve diferença estatística significativa entre as espécies com p = 0,0048. Todas as 486 amostras pesquisadas, foram negativas no exame de PCR do sangue. A prevalência de animais com crosta resultou em 7,2% e em seus cuidadores 2,4%. As análises estatísticas foram realizadas com o programa SAS (SAS Institute, 2011) em nível de significância de 0,05. Concluiu-se teste de virusneutralização no soro entre as espécies foi significativo estatisticamente (p = 0,048), com isso, sugere-se que quanto maior a convivência dos ovinos com seus cuidadores; a concordância entre os métodos diagnósticos de virusneutralização, PCR e histopatológico são importantes associações para o diagnóstico conclusivo da doença; a enfermidade está difundida no...
Abstract: Responsible for significant economic losses in affected flocks, the Contagious Ecthyma is a disease caused by Orf virus belonging to the genus Parapoxvirus, epitheliotropic, the Poxviridae family and subfamily Chordopoxvirinae. It could be transmitted to humans who handle and work with infected sheep, causing crusted lesions and proliferative skin and the mucocutaneous junction, both in animals and in humans. The study showed the disease diffusion in São Paulo. They sampled 42 (8.64%) Animal caregivers and 444 (91.36%) sheep (n = 486). Of these, 453 (93.21%) showed no clinical signs, while 33 (6.79%) suspected cases of the disease (32 sheep and a caregiver) that were biopsied and performed histopathological and PCR tests. This all samples (n = 486) were suggestive of Ecthyma Contagious 6.38% and 0.41% suggestive of other skin lesions on histopathological examination. In examining PCR among 486 sampled, 4.32% were positive, while 2.47% were negative. The prevalence of reagents for virus neutralization was 67% in sheep and their caregivers 76% (p = 0.22). The distribution of titles had statistically significant differences between species with p = 0.0048. All surveyed 486 samples were negative in PCR test blood. The prevalence of animals with crust resulted in 7.2% and 2.4% their caregivers. Statistical analyzes were performed with SAS software (SAS Institute, 2011) at 0.05 significance level. Virus neutralization test in conclusion serum between species was statistically significant (p = 0.048), therefore, it is suggested that the higher the coexistence of sheep with their caregivers; the correlation between the diagnostic methods of virus neutralization, PCR and histopathology are important associations for the conclusive diagnosis of the disease; the disease is widespread in São Paulo and the geographical distribution did not influence the genetic similarity of the virus
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Ljuba, Vujanović. "Kontaktna senzibilizacija kod obolelih od hronične venske insuficijencije." Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2014. https://www.cris.uns.ac.rs/record.jsf?recordId=87660&source=NDLTD&language=en.

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Pojava alergijskog kontatnog dermatitisa koji nastaje kao komplikacija tokom lečenja hronične venske insuficijencije je dobro poznata. Cilj istraživanja je bio da se kod obolelih od hronične venske insuficijencije utvrdi učestalost kontaktne senzibilizacije ekcemskog tipa, potom da li postoji rizik za nastanak kontaktne senzibilizacije kao i postojanje korelacije između dužine trajanja bolesti i kontaktne senzibilizacije. Hipoteza rada je da osobe sa hroničnom venskom insuficijencijom značajno češće razvijaju kontaktnu senzibilizaciju nego osobe bez hronične venske insuficijencije, da imaju veći rizik za nastanak kontaktne senzibilizacije kao i da je učestalost kontaktne senzibilizacije u pozitivnoj korelaciji sa dužinom trajanja bolesti. Istraživanje je sprovedeno nad 266 ispitanika. Formirane su dve grupe. Eksperimentalnu grupu su činili oboleli od hronične venske insuficijencije upućeni na alergološko testiranje pod sumnjom na postojanje kontaktnog dermatitisa, a kontrolnu grupu su činili bolesnici bez hronične venske insuficijencije epikutano testirani pod sumnjom na postojanje kontaktnog dermatitisa. Obolelima od hronične venske insuficijencije je procenjena težina bolesti na osnovu CEAP klasifikacije. Potom je svaki ispitanik podvrgnut alergološkom epikutanom testiranju pač testom. Istraživanje je pokazalo da je učestalost kontaktne senzibilizacije među obolelima od hronične venske insuficijencije iznosila 49,3%. Učestalost kontaktne senzibilizacije kod osoba sa hroničnom venskom insuficijencijom na alergene: iz sastava Evropske standardne baterije je iznosila 31,55%; baterije specifične za hroničnu vensku insuficijenciju je iznosila 28,45%; komercijalno dostupne baterije alergena ubikvitarnih korovskih biljaka iz porodice Compositae je iznosila 6,69%; originalno spravljene ekstrakte ubikvitarnih korovskih biljaka Vojvodine je iznosila 6,11%. Ne postoji statistički značajna razlika u odnosu na pol. Prevalencija kontaktne senzibilizacije kod osoba sa hroničnom venskom insuficijencijom se nije statistički značajno razlikovala od osoba koje nisu imale hroničnu vensku insuficijenciju. Pozitivnost epikutanog alergološkog testa kojim se potvrđuje postojanje kontaktne senzibilizacije je bila statistički značajno viša kod osoba sa hroničnom venskom insuficijencijom. Osobe sa hroničnom venskom insuficijencijom su imale 2,45 puta viši rizik za nastajanje kontaktne senzibilizacije na dva i više alergena, a 3,69 puta viši rizik za nastajanje kontaktne senzibilizacije na pet i više alergena u odnosu na one bez hronične venske insuficijencije. Učestalost kontaktne senzibilizacije je u pozitivnoj korelaciji sa dužinom trajanja bolesti.
Development of allergic contact dermatitis as a complication of treatment of chronic venous insufficiency is well known. The aim of this study was to determine the incidence of eczematous contact sensitization in patients with chronic venous insufficiency, possible risks for the development of contact sensitization, and the correlation between disease duration and contact sensitization. The working hypothesis was that the incidence of contact sensitivity is significantly higher in individuals with chronic venous insufficiency than in those without chronic venous insufficiency, that they are at greater risk of developing contact sensitization, and that there is a positive correlation between the incidence of contact sensitization and the disease duration. The study included 266 patients. They were divided into two groups: the study group included patients with chronic venous insufficiency referred for allergy testing due to suspected contact dermatitis, and the control group included patients without chronic venous insufficiency patch tested for suspected contact dermatitis. The severity of chronic venous insufficiency was assessed by CEAP classification. Thereafter, each patient underwent patch testing. The research has shown that the incidence of contact sensitization among patients with chronic venous insufficiency was 49.3%. In these patients, the incidence of contact sensitization to the European standard battery of allergens was 31.55%; to the battery specific for chronic venous insufficiency it was 28.45%; to commercially available batteries of allergens of ubiquitous plants from the Compositae family it was 6.69%; and to originally prepared extracts of ubiquitous plants found in Vojvodina it was 6.11%. There was no statistically significant difference in relation to sex. The prevalence of contact sensitization in patients with chronic venous insufficiency was not significantly different from those without chronic venous insufficiency. Positive patch test reaction rates, confirming the existence of contact sensitization, were significantly higher in patients with chronic venous insufficiency. Patients with chronic venous insufficiency had a 2.45-fold higher risk for developing contact sensitization to two or more allergens, and a 3.69-fold higher risk for developing contact sensitization to five or more allergens compared to those without chronic venous insufficiency. There was a positive correlation between the incidence of contact sensitization and the duration of the disease.

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Martins, Luis Eduardo Agner Machado. "Detecção de citocinas em culturas de linfócitos em pacientes alérgicos ao cromo." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/5/5133/tde-02092010-183110/.

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A dermatite de contato alérgica decorre de uma reação imunológica, mediada por células T, contra um contactante em pessoas previamente sensibilizadas. O exame padrão ouro para o diagnóstico da DCA é o teste de contato (TC). Infelizmente, o TC demanda tempo, não é inócuo e tem algumas limitações. O teste de proliferação linfocitária (TPL) convencional, uma alternativa ao TC, apresenta baixa sensibilidade no diagnóstico de alergia ao cromo. A fim de aprimorar a sensibilidade o resultado do teste foi obtido pela detecção de citocinas no sobrenadante das culturas e não por timidina radiomarcada. Dezoito pacientes alérgicos ao cromo e 19 controles foram testados com o teste convencional e com as citocinas IFN-?, IL-2, IL-4, IL-5, IL-10, IL-12, IL-13, IL-17 e rantes. Houve correlação entre alergia ao cromo e detecção das citocinas IFN-gama, IL-2, IL-5, IL-12 e IL-13. Dessas, os melhores resultados foram encontrados com a IL-13. O TPL pode ser utilizado como exame adicional ou alternativo no diagnóstico da DCA pelo cromo
Allergic contact dermatitis (ACD) elapses from an specific T cell immunologic reaction against an allergen in a sensitized individual. The gold standard exam to confirm ACD is the patch test (PT). However, PT demands time, has potential side efects and some limitations. The standard lymphocyte proliferation assay (LPA) has sensitivity in the diagnosis of chromium allergy. To optimize this test the results were obtained by detection of cytokines instead radiolabeled thymidine. Eighteen patients allergic to chromium and 19 controls were tested with the conventional LPA and for the following cytokines: IFN-?, IL-2, IL-4, IL-5, IL-10, IL-12, IL-13, IL-17 and rantes. Correlation between allergy to chromium and detection of IFN-gama, IL-2, IL-5, IL-12 e IL-13 was found. The best results were found with IL-13. LPA can be used as an alternative or additional test in the diagnosis of ACD by chromium.

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Minang, Jacob. "Cytokine responses in metal-induced allergic contact dermatitis : Relationship to in vivo responses and implication for in vitro diagnosis." Doctoral thesis, Stockholm : Dept. of Immunology, Wenner-Gren Institute, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-717.

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Gamradt, Pia. "Tissue-resident memory T cells in eczema : contribution and protective regulatory mechanisms." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1306/document.

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Les eczémas [eczéma allergique de contact (EAC) et l'eczéma atopique (EA)] sont des dermatoses inflammatoires fréquentes des pays industrialisés. Elles sont induites suite au recrutement et à l'activation dans la peau de lymphocytes T spécifiques d'allergènes, qui sont présents dans notre environnement, et qui sont habituellement très bien tolérés par la majoritédes individus exposés. Ce travail de thèse porte sur un aspect novateur de la physiopathologie des eczémas, à savoir : la contribution des lymphocytes T mémoires résidants (LTrm) dans la peau à la chronicité et à la sévérité de ces maladies.Capitalisant sur des modèles précliniques pertinents ainsi que sur des échantillons cliniques prélevés chez les patients, ce travail a permis d'acquérir de nouvelles connaissances : (i) de nombreux LTrm CD8+ spécifiques colonisent les lésions d'eczéma (ii) ils s'accumulent avecla persistance de l'allergène dans la peau, (iii) ils jouent un rôle majeur dans les récidives de la maladie, mais (iv) ils expriment à leur surface divers récepteurs inhibiteurs, tels que PD-1 ou TIM-3, qui empêchent la survenue de réponses allergiques excessives.Ces travaux apportent donc des informations majeures sur la nature unique des LTrm CD8+ spécifiques d'allergènes et des mécanismes qui contrôlent leur réactivation, afin de préserver l'intégrité de la peau et la survenue de réactions chroniques sévères. Le développement des nouvelles stratégies thérapeutiques ciblant la réactivation des LTrm via leurs récepteursinhibiteurs pourrait permettre de restaurer la tolérance chez les individus allergiques
Allergic contact dermatitis (ACD) and atopic dermatitis (AD), also referred to contact or atopic eczema, are frequent skin inflammatory diseases with increasing prevalence and high socioeconomic impact in Western countries. Eczemas are the prototype of skin delayed-type hypersensitivity reactions. Skin lesions are induced by the recruitment and activation in the skin of effector/memory T cells specific for environmental antigens that are innocuous to healthy non-allergic individuals.The aim of this work was to better understand the pathophysiology of eczemas by a comprehensive analysis of the contribution of skin resident memory T cells (Trm) to the chronicity and severity of these diseases.Capitalizing on relevant preclinical eczema models and on clinical samples collected from allergic patients, this work showed that: (i) numerous allergen-specific CD8+Trm colonize the eczema lesion, (ii) they accumulate in the epidermis in response to the long-term persistence of the allergen in the skin, (iii) they are instrumental for the recurrence of eczema, but (iv) theyexpress several inhibitory check point receptors (ICRs, such as PD-1, TIM-3) at their surface, which keep them in check to prevent the development of severe immunopathology.Thus, our work provides important information for considering the unique nature of hapteninduced CD8+ Trm and the mechanisms that prevent their unwanted reactivation and subsequent development of chronic or severe skin allergy. The development of therapeutic strategies targeting the reactivation of skin Trm in situ via their ICRs should open new avenues to restore tolerance in allergic individuals

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Heldwein, Clarissa Giesel. "ISOLAMENTO DO PRINCIPAL CONSTITUINTE ATIVO DO ÓLEO ESSENCIAL DE Lippia alba (MILL.) N. E. BROWN COM POTENCIAL ANESTÉSICO GERAL E ESTUDO DO MECANISMO DE AÇÃO." Universidade Federal de Santa Maria, 2011. http://repositorio.ufsm.br/handle/1/8959.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Lippia alba (Mill.) N. E. Brown is an aromatic herb commonly used as sedative and for the treatment of gastrointestinal disturbs. Many literature data confirm the sedative property of the essential oil (EO) of this species; however, just recently its anesthetic activity was confirmed. The present study reports the isolation of two major chemical constituents of the EO of L. alba, linalool and eucalyptol, and also the evaluation of their anesthetic activity in juveniles of silver catfish (Rhamdia quelen). Additionally, linalool was defined as the major active compound of the EO with anesthetic property, and eucalyptol did not presented activity in the tested concentration. The involvement of GABAergic system on the mechanism of action of the EO and its major constituent was also studied. The results showed that the EO contains one or more compounds which act in synergism with linalool and also by different mechanism. Benzodiazepine like effect was detected for the EO of L. alba, but not for linalool. In addition, this work brings a case report of contact dermatitis caused by the leaves of L. alba chemotype linalool. Finally, to establish a good quality of the plant material, after yield and chemical composition analyses of the EO, 1,0 x 0,8 m was defined as the better spacing for cultivation of L. alba. The results are presented in three manuscripts.
Lippia alba (Mill.) N. E. Brown é uma planta odorífera utilizada popularmente com finalidade ansiolítica e para o tratamento de distúrbios gastrintestinais. Na literatura existem muitos trabalhos que confirmam a propriedade sedativa do seu óleo essencial (OE), porém, somente há pouco tempo a sua propriedade anestésica foi confirmada. Este trabalho apresenta o isolamento de dois constituintes majoritários do OE de L. alba, linalol e eucaliptol, bem como a avaliação de sua atividade anestésica geral em jundiás juvenis (Rhamdia quelen). Ainda, o linalol foi definido como o constituinte ativo majoritário do OE com potencial anestésico, enquanto que o eucaliptol não apresentou atividade nas concentrações testadas. Adicionalmente foi estudado o envolvimento do sistema GABAérgico no mecanismo de ação do OE e de seu constituinte ativo majoritário. Os resultados correspondentes aos estudos de mecanismo permitem afirmar que existe(m) um ou mais compostos presentes no OE, que atuam em sinergismo com o linalol e por mecanismos distintos. Enquanto que para o OE de L. alba foi detectado um mecanismo tipo benzodiazepínico, o linalol age por outro mecanismo ainda não esclarecido. Em adição, este trabalho relata pela primeira vez um caso de dermatite de contato causada pelas folhas frescas de L. alba quimiotipo linalol. Por fim, no sentido de estabelecer uma boa qualidade da matéria prima vegetal para posteriores trabalhos, após a análise de rendimento e composição química do OE, 1,0 x 0,8 m foi definido como melhor espaçamento para o cultivo de L. alba. O trabalho encontra-se na forma de manuscritos, contendo três artigos científicos.

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Debeuckelaere, Camille. "Synthèse d'allergènes marqués au carbone 13 et études par RMN HRMAS de leurs interactions avec des épidermes reconstruits." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAF050.

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L'allergie de contact est une pathologie en constante augmentation et particulièrement répandue dans les pays industrialisés. Aucune thérapie n'existe actuellement et seule l'éviction totale de l'allergène permet d'éviter toute nouvelle réaction d'allergie. La base de l'allergie de contact est la formation d'une liaison entre l'allergène et les protéines épidermiques. C'est cette étape chimique clé qu' il est important de comprendre afin de développer de nouvelles méthodes dites« alternatives» dans le cadre de l'actuelle législation sur les cosmétiques. Le but de ce travail de thèse a été d'étudier la réactivité de différents allergènes connus face aux acides aminés et protéines d'épidermes reconstruits de type SkinEthic® par la technique RMN HRMAS dérivée de la RMN du solide. Six allergènes ont ainsi été étudiés et leur réactivité a été comparée a celle observée en solution face à une protéine modèle
Contact dermatitis is one of the most common health problem and highly prevalent in industrialized countries. No therapy currently exists and only the total eviction of the allergen can prevent further allergie reaction.The key molecular event in skin sensitization is the formation of a bond between the allergen and the epidermal proteins. Due to the recent legislation on cosmetic and to help avoid the inappropriate use of new allergens, the understanding of this key step has to be expanded in order to develop new alternative metbods.The aim of this PhD work is to study the reactivity of some allergens towards amino acids and proteins presents in reconstructed human epidermis like SkinEthic® using the HRMAS NMR technique. Six allergens have been studied and their reactivity was compared to that observed ln solution with a model protein

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