Tesi sul tema "Fibroblastes gingivaux"
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Lorimier, Sandrine. "L'influence de l'environnement cellulaire sur le phenotype des fibroblastes gingivaux et dermiques". Paris 5, 1996. http://www.theses.fr/1996PA05M091.
Testo completoSenni, Karim. "Effets de polysaccharides d'origine marine sur le remodelage des tissus gingivaux et dermiques". Paris 13, 2000. http://www.theses.fr/2000PA132031.
Testo completoNaveau, Adrien. "Traitement de l'anévrysme abdominal aortique par transplantation de fibroblastes gingivaux autologues : études in vitro". Paris 5, 2007. http://www.theses.fr/2007PA05M006.
Testo completoAbdominal aortic aneurysm (AAA) formation is associated with matrix degradation an metalloproteinases activity increase. We aimed to test the embryo-like healing propertie attributed to the gingival fibroblast (GF) on these arteries ex vivo. In order to identify the GF in coculture, we first established a labeling method from anioni nanoparticles. We have then analyzed the secretion of metalloproteinases (MMP)-9, MMP- and MMP-3, and their tissue inhibitor (TIMP)-1 in rabbit aortic rings cultured in presence o GF, and in smooth muscle cells cultured gingival, dermal and adventitial fibroblasts. These in vitro resuits do show an increase of TIMP-1 associated with GF presence, whic inhibits these enzymes and protects as well the arterial elastic network. The GF transplantation seems to us of crucial interest to treat AAA
Letzelter, Corinne. "Cytotoxicite activites proteolytiques des produits metaboliques de bacteries buccales vis-a-vis de fibroblastes gingivaux in vitro". Toulouse 3, 1999. http://www.theses.fr/1999TOU30092.
Testo completoGiraud, Andréas. "Développement d’une approche de thérapie cellulaire de l’anévrisme de l’aorte abdominale utilisant les fibroblastes gingivaux chez la souris". Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCB029/document.
Testo completoAbdominal aortic aneurysm (AAA), frequently diagnosed in old patients, is characterized by chronic inflammation, vascular cell apoptosis and metalloproteinases-mediated extracellular matrix destruction. Depiste improvement in the understanding of the pathophysiology of the aortic aneurysm disease, no pharmacological treatment is available to limit dilatation and/or rupture. In the study reported here, we tested whether periadventitial allograft of GF prevented abdominal aortic aneurysmal growth and rupture in mice and investigated the mechanisms of vascular protection. In vitro, mouse GF proliferated and produced large amounts of anti-inflammatory cytokines and Timp-1, an inhibitor of metalloproteinases. When layed down in the periadventitial abdominal aorta, we documented that GF survived in vivo, proliferated and organized as a thick layer. Furthermore, GF locally produced Il-10, TGF-β and Timp-1. In an elastase-induced AAA, GF prevented both macrophage and lymphocyte infiltration, elastin degradation and aneurysm growth. Specific invalidation of Timp-1 in GF abolished the beneficial effect of cell therapy. In an Angiotensin II/anti-TGF-β model of AAA, GF cell therapy limited AAA development and prevented abdominal rupture. Gingival fibroblast is a promising cell therapy approach to inhibit aneurysmal progression and rupture through the local production of Timp-1
Soheili-Majd, Esmat. "Etudes des mécanismes de la cytotoxicité des biomatériaux dentaires sur les fibroblastes pulpaires et gingivaux humains : effets des anti-oxydants". Paris 5, 2004. http://www.theses.fr/2004PA05M122.
Testo completoKut-Lasserre, Christelle. "Effet protecteur des insaponifiables d'huile d'avocat et de soja sur la matrice conjonctive gingivale et sur leur capacite a remodeler cette matrice par les fibroblastes gingivaux humains en culture : etude ex vivo et in vitro". Paris 5, 1999. http://www.theses.fr/1999PA05M083.
Testo completoPapa, Steve. "Evaluation de l'adhérence gingivale et du potentiel antibactérien de surfaces structurées par laser femtoseconde pour l'implantologie orale". Electronic Thesis or Diss., Saint-Etienne, 2023. http://www.theses.fr/2023STET0063.
Testo completoThis thesis addresses issues related to infections of dental implants, such as peri-implantitis, caused by the adhesion of periodontopathogenic bacteria. It explores the use of femtosecond laser (fs-L) texturing to enhance the properties of titanium alloy (Ti6Al4V) implant surfaces.The project, funded by the ANR and conducted in collaboration with various laboratories, employed advanced characterization techniques to analyze textured surfaces and evaluate their effectiveness under biological conditions. The results demonstrate that fs-L texturing can create micro and nanometric periodic surface structures (LIPSS), altering the contact surface and thus cellular and bacterial adhesion. Textured surfaces showed a significant reduction in the adhesion of periodontopathogenic bacteria, such as Porphyromonas gingivalis, potentially reducing the risks of peri-implantitis.In vitro studies also confirmed better adhesion of gingival fibroblasts to textured surfaces, which could reduce the risk of bacterial infiltration and thus improve implant stability and integration.In conclusion, femtosecond laser texturing of dental implant surfaces holds promise for creating more durable and dual-functionalized implants, enhancing cellular adhesion, and possessing increased antibacterial properties. These advancements pave the way for implants better suited to current clinical challenges while contributing to the fight against antibiotic resistance. Further studies closer to clinical settings are planned to validate these results and explore the interactions between fs-L topographies and the biological responses of surrounding tissues
Azevedo, Fabiola Pontes. "Avaliação comparativa do comportamento adaptativo de fibroblastos humanos cultivados de mucosa palatina não marginal e de enxerto gengival em área marginal". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25146/tde-05062013-093746/.
Testo completoFree gingival grafts are important to ensure conditions for the establishment of homeostasis of the periodontal soft tissues. The process of inflammation does not occur the same way in all connective tissues and fibroblasts have the ability to respond to aggressive stimuli through the release of various cytokines, which play an important role in the inflammatory infiltrate formation. In literature, there are no studies comparing the behavior of fibroblasts from palatal mucosa (not marginal) and fibroblasts from marginal free gingival graft (FGG) regarding their resistance towards periodontal disease aggressive stimuli. Thus, the purpose of this study was to investigate whether fibroblasts from the palatal mucosa behave differently when grafted to the gingival margin considering their mechanism of cytokine secretion. Biopsies from the palatal mucosa were collected at the time of FGG surgery (initial period) and after 4 months (final period) when surgery for root coverage was performed. The fibroblasts were cultured and stimulated with LPS of Porphyromonas gingivalis (Pg) and Escherichia coli (Ec) for 24 and 48 hours in order to make a comparative evaluation of cytokines and mediators of tissue repair expression, such as IL-6, IL-8/CXCL8, MIP-1α/CCL3, TGF-β, VEGF and CXCL16. Cytokines were measured in the cell supernatant by enzyme immunoassay (ELISA). For cytokine IL- 6, fibroblasts from palatal mucosa maintained the same secretion pattern when grafted to the gingival margin; for MIP-1α the secretion was significantly increased by fibroblasts from the marginal gingival graft after 48 hours of stimulation with Pg when compared to palatal mucosa fibroblasts; IL-8 secretion by palatal mucosa fibroblasts did not increase in response to Pg LPS challenge and fibroblasts from marginal gingival graft showed secretion even without the stimulus of LPS; only fibroblasts from marginal gingival graft showed secretion of TGF-β, even in the absence of LPS stimulation; VEGF and CXCL16 secretion by fibroblasts was not detected. It was concluded that fibroblasts from palatal mucosa seem to adapt to local conditions when grafted to the gingival margin area, providing evidence of its effective participation in the homeostasis of marginal periodontium through the production of important inflammatory mediators.
Kreidly, Mariam. "IL-34 Expression in Gingival Fibroblasts, Gingival Crevicular Fluid and Gingival Tissue". Thesis, Umeå universitet, Tandläkarutbildning, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-97861.
Testo completoCherifi, Hafida. "Le fibroblaste gingival : une cellule à potentiel thérapeutique pour l’anévrisme aortique". Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST0058.
Testo completoIntroductionGingival fibroblast (GF) is the main cell in gingiva which is constantly facing infectious, thermal and physico-chemical attacks. When a lesion occurs, the repair of gingiva is almost perfect. It is not the case for other tissues as the aortic wall. The aortic aneurysm (AA) is a pathologic expansion of aorta due to a weakening of the wall with an exhaustive secretion of metalloproteinases (MMPs) and particularly of MMP-9. In an aneurysm rabbit model, Durand and al (2012) have showed that GF could slow down or repair the aneurysm. In our study, we have established a co-culture model of human GF and human AA.For human, the location of the aortic disease may be at abdominal level (Abdominal Aortic Aneurysm: AAA) and thoracic level (Thoracic Aortic Aneurysm: TAA). Since the aetiologies are different, we wondered if histo and physiopathologic differences would existe between the both. It is impotant to know that for better supporting the disease. One of the difference between AAA and TAA is the presence of an infectious factor in AAA. This is an element to consider for cell therapy, so we studied the behavior of GF in presence of an endotoxin, the LPS.In addition, to further our work on the use of GF in cell therapy, we have initiated a study of the plasticity of the GF multipotente subpopulation including the differentiation into vascular cells (endothelial cell in particular).Results/DiscussionThanks to its TIMP-1 secretion, GF could contribute to the inhibition of MMP-9 activity in aneurysm. The secretion of MMP-9 in AA with atheroma (AAA) is highter than in TAA (without atheroma in our study). It is correlated to the degradation of AAA which is more important than the degradation of TAA. Inflammatory cells may secrete MMP-9. Inflammation is present in AAA and not in TAA. This, could explain the highter secretion of MMP-9 in abdominal lesion and also the degradation which is more important in AAA than in TAA. As for the origin of this inflammation, we researched an infectious factor. We isolated Porphyromonas gingivalis (Pg) in AAA, which might trigger or aggravate inflammation. This is an important bacterium in the development of periodontitis (inflammatory disease of the tissues supporting the tooth). A pathological relationship may exist between periodontitis and the AAA. The study should be further to know the pathophysiology of AAA related to Pg. But as regards the cell therapy, LPS, which is an endotoxin of Pg would not affect the secretion of TIMP-1 by the GF.In addition to its abilities to inhibate MMP-9 in aneurysm, we wondered if GF would be able to differentiate into vascular cell. An early exploration of GF multipotent subpopulation plasticity reveals a possible opportunity to go further in a the cell therapy.Conclusion.GF might be a promising cell for treating aortic aneurysm but further explorations are still necessary for its application
Rodrigues, Annelissa Zorzeto. "Avaliação in vitro do cultivo de fibroblastos gengivais humanos em matriz dérmica acelular". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/58/58132/tde-30062008-150532/.
Testo completoAcellular Dermal Matrix, ADM, is a biomaterial that has been used in periodontal procedures to treat mucogingival defects. Mucogingival defects can be corrected by autogenous grafts that are the most common procedure used in periodontology, however, because of the limited source of donor\'s tissue this procedure became limited. The aim of this investigation was to verify, in vitro, different aspects related to human gingival fibroblasts seeding on to the ADM. Human gingival fibroblasts were established from explant cultures from the connective tissue of keratinized gingiva collected from three healthy patients. ADM was seeded with gingival fibroblasts for 14 and 21 days, and then cell adherence, proliferation and viability were analyzed. Results revealed that, at day 7, fibroblasts were adherent and spreading on the ADM surface, and were unevenly distributed, forming a discontinuous single cell layer, at day 14, a confluent fibroblastic monolayer lining ADM surface was noticed. At day 21, the cell monolayer exhibited a reduction in cell density. The results suggests that fibroblasts seeding on the ADM for 14 days can allow good conditions for cell adhesion and spread on the matrix, however, because of the high collagen fiber bundle density cell, migration inside the matrix was limited.
Loison-Robert, Ludwig. "Cellule souche gingivale : origine et multipotence". Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC0083/document.
Testo completoGingiva is a natural regeneration model thanks to its "ad integrum" healing capability. Gingival fibroblasts are the main actors of this property. These cells, the main cellular component of the gingival connective tissue, regulate the inflammatory responses and healing process. This tissue contains, like many others, mesenchymal stem cells; which also partly explain these regenerative abilities. Moreover, as the gingiva is abundant and easily accessible, the use of these stem cells may interest cell therapy or in vitro model tissues responses. In this work, we demonstrated that Stem Cells Derived from Human Gingiva (SCHG) have common properties with neural crest adult stem cells. These cells can be called "stem cells" for their ability to self-renew, adhere to plastic and to differentiate. First, we have shown that the method and the culture products used for isolation of gingival fibroblasts from gingival biopsy had an influence on the obtained cells. Secondly, an analysis of in vitro clonal populations of gingival fibroblasts has shown that gingival fibroblasts are composed of subpopulations that express specific markers of stem cells and neural crests. In addition to their embryological origin, the study of their multipotency was also characterized after expansion and depending on the used additives. Finally, two examples of using these cells and dental pulp stem cells as a model to study the in vitro biocompatibility of biomaterials have been developed, mimicking oral mucosa or dentin reactions (reparative or reactional)
Sobral, Lays Martin. "Participação de Smad7 e CTGF na transdiferenciação de miofibroblastos gengivais e análise da influência dos miofibroblastos na proliferação e invasão de carcinomas espinocelulares orais". [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288721.
Testo completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Miofibroblastos são células mesenquimais caracterizadas pela expressão da isoforma ? da actina de músculo liso (?-SMA) e pela secreção de proteínas da matriz extracelular, fatores de crescimento e proteases. Estas células desempenham um papel importante na reparação de feridas e em processos patológicos, incluindo fibroses e cânceres. Os objetivos deste estudo foram 1) analisar o papel do fator de crescimento de tecido conjuntivo bem como o efeito da superexpressão de Smad7 na transdiferenciação de miofibroblastos gengivais induzida pelo fator de crescimento transformante-?1 (TGF-?1), 2) isolar e caracterizar linhagens celulares de miofibroblastos do estroma de carcinomas espinocelulares (CEC) orais e comparar o potencial proliferativo e produção de metaloproteinases de matriz (MMP) com linhagens celulares de fibroblastos do estroma de CEC orais, e 3) analisar a influência de miofibroblastos na modulação da proliferação e invasão de linhagens celulares de CEC oral. Nossos resultados demonstraram que o tratamento com TGF-?1 induziu simultaneamente a expressão de ?-SMA e CTGF e a neutralização de CTGF com RNA de interferência (siRNA) bloqueou o efeito de TGF-?1 na indução da transdiferenciação de células de gengiva normal em miofibroblastos. A superexpressão de Smad7 em células de GN inibiu a cascata de ativação de TGF-?1, caracterizada pela fosforilação de Smad2 e expressão de ?-SMA, CTGF e colágeno tipo I. Similarmente, miofibroblastos isolados do tecido gengival de fibromatose gengival hereditária (FGH) superexpressando Smad7 demonstraram níveis reduzidos de ?-SMA e pSmad2, além de baixos níveis de expressão de CTGF e colágeno tipo I. Três linhagens celulares de miofibroblastos foram isoladas do estroma de CEC de língua e caracterizadas pela expressão de ?-SMA e por níveis elevados de produção de colágeno tipo I. Embora o potencial proliferativo dos clones de fibroblastos e miofibroblastos tenham sido semelhantes, as produções de MMP-1, -2, -9 e -13 foram significantemente maiores em miofibroblastos. Finalmente, nós demonstramos que miofibroblastos do estroma tumoral produzem níveis elevados de alguns fatores de crescimento comparado com fibroblastos, incluindo ativina A. Meios de cultura condicionados por miofibroblastos contendo ativina A significantemente induziu a proliferação de linhagens celulares de CEC oral e uma maior progressão tumoral in vivo, enquanto que o bloqueio de ativina A por siRNA diminuiu significantemente a proliferação das células de CEC oral. In vitro, miofibroblastos induziram a invasão de linhagens celulares de CEC oral, o qual foi acompanhado por uma indução na produção de MMPs, e in vivo uma significante correlação entre presença de miofibroblastos e atividades de MMP-2 e MMP-9 foi observada. O bloqueio da síntese de ativina A por siRNA em miofibroblastos não alterou a capacidade de indução da invasão e síntese de MMPs. Os resultados deste estudo demonstram 1) que Smad7 bloqueia a transdiferenciação de miofibroblastos gengivais por meio da inibição da fosforilação de Smad2 e da transcrição de CTGF, 2) que miofibroblastos no estroma de CEC orais podem contribuir para um fenótipo mais invasivo via secreção de elevados níveis de MMPs e 3) que produtos de síntese dos miofibroblastos induzem a proliferação e invasão das células de CEC oral e os estímulos proliferativos são controlados pela produção de ativina A.
Abstract: Myofibroblasts are mesenchymal cells, characterized by the specific isoform ? of the smooth muscle actin (?-SMA) expression and the extracellular matrix proteins, growth factors and proteases secretion. These cells play a central role on wound healings and in pathologic process, including fibrosis and cancers. The aims of this study were 1) analyze the connective tissue growth factor (CTGF) role and the superexpression of Smad7 effect on TGF-?1-induced gingival myofibroblasts transdifferentiation, 2) isolate and characterize myofibroblast cell lines from oral squamous cell carcinomas stroma (OSCC) and compare the proliferative potential and matrix metalloproteinases (MMP) production with fibroblast cell lines from OSCCs stroma, and 3) analyze the myofibroblasts influence on the modulation of OSCC cell lines proliferation and invasion. Our results demonstrated that the TGF-?1 treatment induced simultaneously the ?-SMA and CTGF expression and the CTGF neutralization using the small interference RNA (siRNA) blocked the TGF-?1-induced gingival myofibroblasts transdifferentiation. Smad 7 superexpression in normal gingival cells (NG) inhibit the TGF-?1 cascade activation, characterized by the Smad2 phosphorilation and ?-SMA, CTGF and type I collagen expression. Similarly, hereditary gingival fibromatosis (HGF) myofibroblasts superexpressing Smad 7, demonstrated reduced levels of ?-SMA and phospho-Smad2, and low expression levels of CTGF and type I collagen. Three myofibroblast cell lines were isolated from tongue OSCC stroma and characterized by the ?-SMA expression and high levels of type I collagen. Although the proliferative potential of fibroblast and myofibroblast clones has been similar, the MMP-1, -2, -9 and -13 were significantly higher in myofibroblasts. Finally, we demonstrated that tumor stroma myofibroblasts produce high levels of some growth factors compared with fibroblasts, including activin A. Myofibroblasts conditioned medium containing activin A induce significantly the OSCC cell lines proliferation and a tumor progression in vivo, while the activin A dowregulation by siRNA significantly decreased the OSCC cells proliferation. In vitro, myofibroblasts induced OSCC cells invasion, accompanied by an induction of MMPs production, and in vivo was observed a significant correlation between the myofibroblasts presence and the MMP-2 and MMP-9 activity. The myofibroblasts dowregulation of activin A by siRNA did not affect the induction of invasion and MMPs synthesis. The results of this study demonstrate that 1) Smad 7 blockage the gingival myofibroblasts transdifferantiation through the inhibition of Smad 2 phosphorilation and CTGF transcription, 2) myofibroblasts on the OSCCs stroma can contribute to a more invasive phenotype via elevated levels of MMPs secretion, 3) myofibroblasts released products induce an OSCC cells proliferation and invasion and the proliferative stimulus are controlled by the activin A production.
Doutorado
Estomatologia
Doutor em Estomatopatologia
Yucel-Lindberg, Tülay. "Regulation of prostaglandin E₂ synthesis in human gingival fibroblasts /". Stockholm, 1999. http://diss.kib.ki.se/1999/91-628-3734-6/.
Testo completoVičiūnaitė, Neringa. "Skirtingų titano implantų paviršiaus modifikavimo strategijų poveikis dantenų fibroblastų savybėms". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120726_143425-36935.
Testo completoThe influence of different modification strategies of titanium implant surfaces on gingival fibroblasts properties - adhesion, proliferation, and differentiation was studies in this final master thesis. Different titanium surface roughness modifications using physical methods such as sand-blasting as well as laser irradiation were developed. Gingival fibroblasts derived from human gingival subepithelial tissues obtained during gingivectomy were isolated and characterized. The data suggested that the initial adhesion between tested cells and various modified titanium surfaces was similar, but the most efficient surface for subsequent cell attachment was laser-ablated holey arranged in grid-like structures. Additionally, in order to improve the modified titanium surface adhesion properties, these surfaces were coated by extracellular matrix proteins - collagen and laminin. The coating influence on the cell growth and adhesion was evaluated. To analyze the mechanisms regulating cell adhesion processes on the modified surfaces, FAK and Akt kinase expression as well as activation were studied. In order to evaluate the effect of surface topography on cell differentiation, the level of osteogenic differentiation was compared. Structure: introduction, literature review, materials and methods, results and discussion, conclusions, references.
Williams, Rachel Claire. "Leptin regulation of inflammatory responses in human gingival fibroblasts". Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/2976.
Testo completoMcKnight, Holly A. "PROTEOMIC ANALYSIS OF MEMBRANE BOUND AND ASSOCIATED PROTEINS OF HUMAN GINGIVAL FIBROBLASTS AND PERIODONTAL LIGAMENT FIBROBLASTS". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338325450.
Testo completoPfeiffer, Friederike. "Untersuchung des Adhäsionsverhaltens von Gingiva-Fibroblasten auf mikrostrukturierten Titanoberflächen". [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11195193.
Testo completoFerré, François. "Isolation et caractérisation des cellules souches gingivales : étude de leur potentiel multipotent". Phd thesis, Université René Descartes - Paris V, 2013. http://tel.archives-ouvertes.fr/tel-01017172.
Testo completoWallis, Jeffrey S. "Changes in gene expression in cyclosporine A treated gingival fibroblasts". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 1.91 Mb., 84 p, 2005. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1428256.
Testo completoLappin, M. J. "The role of gingival fibroblasts in the innate immune response". Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546377.
Testo completoJavaid, Mohammad. "Platelet factor 4 upregulates matrix metalloproteinase-1 production in gingival fibroblasts". Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/60244.
Testo completoDentistry, Faculty of
Graduate
Palmqvist, Py. "Osteotropic cytokines : expression in human gingival fibroblasts and effects on bone". Doctoral thesis, Umeå : Umeå universitet, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-960.
Testo completoOuyang, Ying. "Effect of zinc on the metabolism of thiol-treated human gingival fibroblasts". Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30247.
Testo completoDentistry, Faculty of
Graduate
Young, Duprane Pedaci. "Proliferation and adhesion of human Gingival Fibroblasts on various dental polymer materials". The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1413475378.
Testo completoIshikiriama, Bella Luna Colombini. "Estudo da expressão e produção de componentes do sistema renina-angiotensina por fibroblastos de gengiva e ligamento periodontal humanos". Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/25/25142/tde-08022013-084557/.
Testo completoThe Renin-angiotensin system (RAS) can generate hormones that have a high-impact on cardiovascular regulation as well as in the pathogenesis of cardiovascular disease. This system acts through both systemic (endocrine) and local (paracrine/autocrine) effects of Angiotensin II, controlling important functions related to the facilitation of installation and progression of the inflammatory process. For this reason, this proteins production in tissues can be associated to the pathogenesis of many diseases, including periodontal disease (PD). In the PD setting, a infectious-inflammatory characterized disease, the literature findings shows that inhibition of the Ang II formation can decrease the bone loss in animals. In this context, the aims of the present study were: to investigate in vitro: a) the expression of RAS components (ANGT, RENIN, ECA, ECA- 2, AT1, AT2 and Mas) by human gingival and periodontal ligament fibroblasts by RT-qPCR; b) the production of RAS receptors (AT1, AT2 and Mas) by human cultured gingival and periodontal ligament fibroblasts by Immunofluorescence and d) the production of RAS components (RENIN, ECA, ECA-2) if the expression and production of RAS components by gingival and periodontal ligament fibroblasts modify under P. gingivalis and E. coli LPS stimulation. After collected, the data were analysed using GraphPad Prism 5.0, by the two way ANOVA followed by Bonferroni post test with a significance level of 5%. Gene expression was detected for some of the RAS components (ANGT, RENIN, ECA, AT1) by both gingival and periodontal ligament fibroblasts. It was detected a differential gene expression between gingival and periodontal ligament fibroblasts for ECA, being significantly higher in gingival fibroblasts. There was a stain in Immunofluorescence compatible with the production of RAS receptors (AT1 and Mas). It must be noted that the stimulation with P. gingivalis and E. coli LPS, in a concentration of 10 g/mL/24 h, did not altered the expression of RAS components. In conclusion, despite of neither gingival or periodontal ligament fibroblasts express all components of RAS, needed to local formation of Ang II, they might also contribute to the local formation and action of Ang II and in consequence, to the installation and the progression of DP.
Domeij, Helena. "Expression and regulation of MMP-1 and MMP-3 in human gingival fibroblasts /". Stockholm, 2005. http://diss.kib.ki.se/2005/91-7140-544-5/.
Testo completoSobral, Lays Martin. "Analise dos efeitos e dos mecanismos de ação do fator de crescimento transformante-'beta'1, interferon 'gama' e iclosporina A na transdiferenciação dos fibroblastos gengivais em miofibroblastos". [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288728.
Testo completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Miofibroblastos são células especializadas que exercem funções importantes em processos fibróticos através da síntese elevada de macromoléculas da matriz extracelular, proteases e citocinas. O exato mecanismo do surgimento (transdiferenciação) dos miofibroblastos permanece desconhecido, porém inúmeros estudos sugerem que o fator de crescimento transformante-'beta'1 (TGF-'beta'1) exerça um papel importante neste processo via ativação do fator de crescimento de tecido conjuntivo (CTGF). Em oposição aos efeitos de TGF-'beta'1, algumas citocinas inflamatórias, incluindo interferon 'gama' (IFN'gama'), parecem inibir a transdiferenciação dos miofibroblastos. O uso da droga imunossupressora ciclosporina A (CsA) é freqüentemente associada a inúmeros efeitos colaterais, sendo o aumento gengival fibrótico o de maior interesse para a área odontológica. Linhagens celulares de fibroblastos de gengiva normal tratadas com CsA expressam níveis elevados de TGF-'gama'1 e colágeno, que são intrínsecos do fenótipo miofibroblástico. Os objetivos deste estudo foram compreender a participação de TGF-'beta'1 e IFN'gama' na transdiferenciação dos fibroblastos gengivais em miofibroblastos e entender os mecanismos de ação destes fatores neste processo. Adicionalmente, nós verificamos a presença de miofibroblastos em aumentos gengivais induzidos por CsA. Nossos resultados demonstraram, através de 4 diferentes ensaios: transcriptase reversa-reação em cadeia da polimerase (RTPCR), western blot, imunofluorescência e citometria de fluxo, que TGF-'beta'1 induz e FNg bloqueia a transdiferenciação dos fibroblastos gengivais em miofibroblastos metabolicamente ativos em uma maneira dependente da dose e tempo. Nas células onde a expressão de CTGF foi significantemente reduzida por seqüências específicas de RNA de interferência, TGF-'beta'1 não foi capaz de promover a transdiferenciação dos miofibroblastos, revelando que TGF-'beta'1 é dependente da ativação de CTGF para induzir a transdiferenciação dos fibroblastos gengivais em miofibroblastos. IFN'gama' bloqueou a transdiferenciação dos miofibroblastos por estimular a expressão de Smad 7, uma proteína que regula negativamente a atividade de TGF-'beta'1. Interessantemente, miofibroblastos não foram associados aos aumentos gengivais induzidos por CsA, como revelado pelos modelos in vivo de injeções diárias de CsA em ratos Wistar e in vitro de tratamento de fibroblastos gengivais com CsA. Embora CsA tenha induzido a expressão de TGF-'beta'1, não demonstrou nenhum efeito na modulação dos níveis de CTGF. Nossos resultados demonstram que a indução da transdiferenciação dos miofibroblastos por TGF-'beta'1 é dependente da estimulação de CTGF. Adicionalmente, este estudo sugere que IFN'gama' pode ser clinicamente efetivo no tratamento de alterações fibróticas associadas à presença de miofibroblastos, pois atenua a excessiva produção de colágeno tipo I por estas células
Abstract: Myofibroblasts are the main cellular type involved in extracellular matrix deposition in fibrotic diseases. Relatively little is known about the underlying mechanisms that regulate myofibroblast emergence (transdifferentiation), however the regulatory cytokine transforming growth factor-beta 1 (TGF-'beta'1) has been traditionally considered an inducer of the myofibroblastic phenotype via activation of connective tissue growth factor (CTGF)-dependent pathway. Some inflammatory cytokines, particularly interferon g (IFN'gama'), show opposite effects to TGF-'beta'1, inhibiting myofibroblast transdifferentiation. Cyclosporin A (CsA) is a widely used immunosuppressant drug that causes significant side effects such as gingival overgrowth. Normal gingival fibroblast cell lines treated with CsA express high levels of TGF-'beta'1 and collagen, which are intrinsic of myofibroblasts. In the present study we examined whether TGF-'beta'1 and IFN'gama' can modulate transdifferentiation of gingival fibroblasts into myofibroblasts, and the biologic mechanisms behind those factors in this process. Additionally, we have analyzed the presence of myofibroblasts in CsA-induced gingival overgrowth. Our results demonstrated throughout a modality of experiments that included reverse trancriptasepolymerase chain reaction (RT-PCR), western blot, immunofluorescence and flow citometry analysis, that TGF-'beta'1 induces and IFN'gama' blocks fibroblast-myofibroblast transdifferentiation in a dose- and time-dependent manner. In fibroblasts with CTGF levels know-down by specific small interference RNA, TGF-'beta'1 effect on transdifferentiation was significantly reduced, revealing that CTGF plays a crucial role in mediating TGF-'beta'1 myofibroblast transdifferentiation. IFN'gama' blocked myofibroblast transdifferentiation by stimulating Smad 7 levels, a protein that negatively regulates TGF-'beta'1 signaling. Interestingly, myofibroblasts were not found in CsA-induced gingival overgrowth, as revealed by the in vivo model of daily injections of CsA in Wistar rats and by the in vitro model of gingival fibroblast cultures treated with CsA. Although CsA treatment stimulated TGF-'beta'1 expression by NG fibroblasts, it lacked to induce CTGF levels. Our results demonstrate that TGF-'beta'1 induction of transdifferentiation of gingival fibroblasts to myofibroblasts occurs via a CTGF dependent pathway. Additionally, this study suggests that IFN'gama' may be clinically effective in the treatment of fibrotic diseases associate with myofibroblast
Mestrado
Patologia
Mestre em Estomatopatologia
Mandetta, Carolina de Moraes Rego. "Avaliação in vitro de matriz colágena suína como arcabouço tridimensional para cultivo de fibroblastos gengivais". Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/58/58132/tde-12072012-110036/.
Testo completoIntroduction: Gingival fibroblasts play a central role in oral soft tissue regeneration. Mucograft® (PCM-3D) is a new xenogeneic substitute that has been used in periodontics in techniques such as root coverage and increasing keratinized tissue. The aim of this investigation was to verify if PCM-3D is a suitable three-dimensional matrix though its in vitro response to the culture of HGF. Methods: Human gingival fibroblasts (HGF) culture was established by the explant technique of gingival connective tissues of three healthy patients. HGF were seeded on bidimensional bovine collagen matrix (BCol-2D), three-dimensional bovine collagen matrix (BCol- 3D) and three-dimensional porcine collagen matrix (PCM-3D). HGF were grown for up to 10 days. At 3, 7 and 10 days the following parameters were assessed: HGF number, morphology and distribution by direct fluorescence; cell viability by MTT; cell proliferation and expression of proteins of the extracellular matrix non-collagenous fibronectina and cytoeskeletic - proteins actin and tubulin by indirect immunofluorescence. Quantitative data were submitted to Friedman and Kruskal- Wallis test, and the last one was followed by Tukeys test. Results: Epifluorescence revealed that at 3 days HGF grown on BCol-2D were broader, more flattened and had more cell protrusions and stress fibers in all experimental times. On the other hand, HGF seeded on BCol-3D and PCM-3D displayed a spindle-shaped, elongated, or cylindrical phenotype with fewer protrusions as well as less total cell spread area than on the 2D matrix, with some cells on PCM-3D showing stellate appearance. MTT assay showed cell viability higher in cultures grown on BCol-2D and PCM-3D than in BCol-3D (p<0,001). At 3days a greater number of cells in BCol-2D samples followed by PCM-3D and BCol-3D, respectively, was observed with statistical difference between BCol-2D and PCM-3D and between (p<0,001). At 7 days, there was a decrease in cell number grown on BCol-2D and an increase in BCol-3D and PCM-3D, where the number of cells were significantly higher in BCol-2D in relation to PCM-3D (p=0.002). At the end of the experimental period, there was an increase in total cell number in all of the experimental groups, and it was again significantly greater in BCol-2D than in PCM (p=0.005). Between 3 and 10 days, there was an increase in total cell number in ColB-3D (p<0.001), which showed higher counts within 10 days. Higher percentage of HGF in the cell cycle could be seen in BCol-2D followed by BCol-3D and PCM-3D, respectively, in all of the experimental groups. In PCM-3D there was almost no expression of Ki-67. BCol-2D showed a decrease in HGF cycling between 3 and 10 days (p=0,036). The expression of non-collagenous and cytoskeletal proteins were similar in both matrices during all the period of the study. Conclusion: PCM-3D is suitable for HGF culture, since, within the matrix, important properties were found, among them, morphology, proliferation andprotein expression, similar to those observed in a 3D collagen matrix well established in the literature.
Costa, Eliane Ferraz da. "Influência de Equisetum giganteum e Punica granatum sobre os fibroblastos gengivais humanos: manutenção da viabilidade". Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/25/25150/tde-16082017-174342/.
Testo completoStudies have reported the antimicrobial activity of Equisetum giganteum and Punica granatum, reducing the risk of development of denture stomatitis, a disease mainly related to the colonization of prostheses by the fungus Candida albicans. In view of this, it is necessary that these plants be well tolerated by the oral tissues and, if possible, assist in the repair process. Objective: To carry out a phytochemical study of potentially active substances of E. giganteum and P. granatum and to evaluate the viability of human gingival fibroblasts against different concentrations of these two plants, after different periods in vitro. Material and Methods: After the identification of the plant compounds by HPLC-PAD, the fractions with the best antifungal activity against Candida albicans were selected. The crude extracts and selected fractions of P. granatum and E. giganteum were tested at different concentrations (0.23, 0.47, 0.94, 1.88, 3.75, 7.5, 15 and 30 mg) and periods (12, 24, 36 and 60 h) against human gingival fibroblasts (FGH), for the evaluation of their possible cytotoxicity through the analysis of the viability of FGH by the LIVE/DEAD assay. By means of this assay we quantitatively analyzed the cell viability through the readings of the relative units of fluorescence (URF) and qualitatively by analysis of the cellular morphology and density using inverted fluorescence microscopy, after three independent experiments. The parametric quantitative results were represented as mean and standard deviation (SD) with ANOVA-One-Way Variance analysis, followed by comparative analysis by the Tukey HSD test. The non-parametric quantitative results were presented as medians and quartiles and were submitted to the Kruskal-Wallis test, followed by comparative analysis by the Dunn test, according to normality tests (Kolmogorov-Smirnov test). Values of p <0.05 were indicative of statistical significance. Conclusions: Phenolic compounds, such as flavonoids and tannins, were identified in E. giganteum and P. granantum, respectively. We identified a concentration-dependent cytotoxicity for the two plants tested, regardless of the time. Under the lowest concentrations of plants the viability and morphology of FGH were preserved when compared to the control. Within this context, we believe in the possibility to use these plants as alternative therapy in several health areas, but in biocompatible concentrations.
Maia, Luciana Prado. "Avaliação in vitro de matriz dérmica acelular como arcabouço tridimensional para cultivo de fibroblastos gengivais". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/58/58132/tde-27082010-160945/.
Testo completoGingival fibroblasts play a central role in oral soft tissue regeneration. Alloderm® (Alloderm® - ADM) is the most used and studied allogeneic substitute. The aim of this investigation was to verify if ADM is a suitable threedimensional matrix, through its in vitro response to gingival fibroblasts and cancerous cells lineage and, also, if ADM end products affect cellular behavior. Methods: Canine gingival fibroblasts (CGF) and human gingival fibroblasts (HGF) cultures were established by the explant technique of gingival connective tissues of three dogs and three healthy patients, respectively. CGF, HGF and B16F10 cells of murine melanoma were seeded on ADM and grown for up to 14 days. The following parameters were assessed: presence, morphology and distribution of CGF, HGF e B16F10 by direct fluorescence; CGF and HGF viability by MTT; and the effect of culture medium conditioned (CM) in the MDA for 24 h on CGF viability by MTT. Quantitative data were submitted to Mann-Whitney and Kruskal-Wallis tests, followed by Dunn\'s method. Results: Epifluorescence revealed that CGF and HGF were adherent and exhibited a polygonal morphology at 12 h while at 7 and 14 days they were spread, exhibiting an elongated shape and the actin cytoskeleton assembled into stress fibers. CGF were unevenly distributed on ADM surface, showing no increase in cell number over the experimental periods; HGF formed a monolayer on the ADM surface, in a higher number at 14 days (p<0,05); B16F10 exhibited na increase in cell number in 7 days (p<0,05), and were mainly arranged in cell aggregates on the ADM, forming a continuous layer at 14 days. A higher percentage of cells on the ADM surface (p <0.05) compared to inside the matrix was observed for all cell types in all periods. MTT values indicated higher cell viability in samples cultured with HGF compared to CGF (p=0.024). A significantly lower cell viability for CGF grown in CM compared to cells grown in non conditioned medium at 48 and 72 h (p <0.05) was noticed. Conclusion: Gingival fibroblasts and even highly proliferative cells as B16F10 can be only superficially located on ADM and CGF are negatively affected by ADM end products, reducing its viability.
Pfeiffer, Friederike [Verfasser]. "Untersuchung des Adhäsionsverhaltens von Gingiva-Fibroblasten auf mikrostrukturierten Titanoberflächen / vorgelegt von Friederike Pfeiffer". Tübingen, Engelfriedshalde 85 : F.Pfeiffer, 2004. http://d-nb.info/971387761/34.
Testo completoPalm, Eleonor. "Inflammatory responses of gingival fibroblasts in the interaction with the periodontal pathogen Porphyromonas gingivalis". Doctoral thesis, Örebro universitet, Institutionen för hälsovetenskap och medicin, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-38660.
Testo completoHarris, Jesse. "Comparison of STERIPLEX™ HC and Sodium Hypochlorite Cytotoxicity on Primary Human Gingival Fibroblasts". VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2662.
Testo completoBarona, Intriago Maria Fernanda. "Regulation of gingival fibroblast gene expression by leukocyte and platelet rich fibrin". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62647.
Testo completoDentistry, Faculty of
Graduate
Kunze, Melanie. "Effizienter Gentransfer in humane parodontale Ligamentzellen und humane gingivale Fibroblasten mittels Adeno assoziierter Virus Vektoren". Köln Deutsche Zentralbibliothek für Medizin, 2010. http://d-nb.info/1000932621/34.
Testo completoKelsey, William Patrick V. "Proteomic Analysis of the Nuclear Membranes of Human Periodontal Ligament Fibroblast and Gingival Fibroblast Cell Types: A Comparison Study". Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1243618431.
Testo completoHanino, Mohammad. "Mechanism of ciclosporin-induced gingival hyperplasia : an in vitro study of the effect of ciclosporin on human gingival fibroblasts and oral keratinocytes". Thesis, Queen Mary, University of London, 2011. http://qmro.qmul.ac.uk/xmlui/handle/123456789/1297.
Testo completoAlanazi, Humidah. "Effect of cigarette smoke on "Candida albicans" growth and its interaction with human gingival fibroblasts". Master's thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26367.
Testo completoThe main objective of this study was to investigate the effect of cigarette smoke (CS) on C. albicans and its interaction with human gingival fibroblasts. We have shown that Candida multiplies presence CS, by adopting the hyphae form. CS makes C. albicans sensitive H2O2, but resistant to heat and NaCl. CS in-creases chitin production by C. albicans. Preincubated with CS, C. albicans adheres more to gingival cells in monolayer, proliferating more and adopts the hyphae form more easily. Fibroblasts show a reduction of their growth, but produce more IL-1b. CSC modulates C. albicans and on the other side also CS modulates the host cells. This suggests a significant negative cigarette smoke promotes oral candidiasis in smokers.
Ramírez, Rámiz Albert. "Estudio celular y molecular en cultivos de fibroblastos tratados con fármacos inductores de agrandamiento gingival". Doctoral thesis, Universitat de Barcelona, 2007. http://hdl.handle.net/10803/689.
Testo completoEn los primeros casos de AGIF, se creía que la alteración histopatológica residía en un aumento de la población celular de los fibroblastos -Hipótesis nula-. Este estudio quiere demostrar que esta alteración se produce en la matriz extracelular -fibras colágenas y glicosaminoglicanos de la sustancia fundamental:
Los fármacos inductores del Agrandamiento gingival no provocan una hiperplasia gingival secundaria a la proliferación celular de fibroblastos -Hipótesis alternativa-.
Para ello se proponen unos objetivos:
1-Determinar si cultivos de fibroblastos de encía humana son sensibles a la acción de fármacos inductores de Agrandamiento gingival.
2-Observar el efecto de estos fármacos en cultivos primarios de fibroblastos procedentes de las muestras examinadas -estudio de la viabilidad celular-.
3-Cuantificar si hay efecto farmacológico en la transcripción génica del Factor de Crecimiento Transformador ß (TGFß), del colágeno y de la colagenasa.
4-Observar si hay efecto farmacológico en la síntesis del colágeno y del TGFß.
Se tomaron muestras gingivales de pacientes, una de ellas sin relación con la administración de fármacos inductores conocidos de Agrandamiento gingival. Otra muestra se tomó de un paciente transplantado renal sometido desde hacía 2 años a ciclosporina -125 mg/12h-. Se observaronn las muestras a microscopía óptica para ver las características histopatológicas y una porción se fragmentó en explantes y se cultivó en medio esencial para conseguir un número determinado de fibroblastos. Se aplicaron los tres fármacos inductores a unas dosis preestablecidas -según estudios in Vitro consultados- y se observó la Viabilidad de los fibroblastos para el análisis de la proliferación celular. En una segunda fase, se estudió la expresión del mRNA de tres proteínas implicadas en la patogenia del AGIF -colágeno, colagenasa y TGFβ-. Finalmente se observó la traducción proteica del colágeno y del TGFβ.
Los resultados permitieron comprobar que no se produjeron cambios en la proliferación fibroblástica para la inducción con nifedipina y ciclosporina. Fenitoína produjo una reducción de esta proliferación como si hubiera un efecto tóxico del fármaco. En la transcripción génica de las proteínas consideradas se observaron aumentos para los tres fármacos inductores. En la expresión proteica del colágeno tampoco se apreciaron cambios.
En base a las muestras analizadas se puede considerar que hay una afectación en la matriz extracelular por la inducción farmacológica al comprobar aumentos significativos en mRNA de colágeno, TGFβ y colagenasa. Aunque hay factores que pueden actuar en la post-transcripción que alteren la expresión de estas proteínas y la actividad de la colagenasa.
Las conclusiones del estudio han sido:
1. Los fibroblastos gingivales de cultivos primarios son sensibles a fármacos inductores de Agrandamiento gingival -fenitoína, nifedipina y ciclosporina-.
2. Los fármacos inductores de Agrandamiento gingival no provocan hiperplasia gingival secundaria a la proliferación celular de fibroblastos.
3. Los fármacos inductores provocan un incremento significativo de la transcripción del TGFß, colágeno y colagenasa.
4. Los fármacos inductores no producen un incremento de la traducción del colágeno, con repercusión en la matriz extracelular.
Yang, Po Fong. "Filamentous actin disruption and diminished inositol phosphate response in gingival fibroblasts caused by Treponema denticola". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0007/MQ40757.pdf.
Testo completoChaussain-Miller, Catherine. "Rôle du fibroblaste dermique et gingival dans la cicatrisation : modulation de l'organisation matricielle in vitro". Paris 5, 2001. http://www.theses.fr/2001PA05M052.
Testo completoFournier, Benjamin. "Thérapie cellulaire de l'anévrisme aortique par le fibroblaste gingival : études ex vivo et in vivo". Paris 5, 2009. http://www.theses.fr/2009PA05T019.
Testo completoAortic abdominal aneurysm is accompanied by a degradation of the elastic network and an increase of the metalloproteinases. We tried to transpose repair qualities of the gingival fibroblast on these arteries in ex-vivo and in vivo models. A culture model of rabbit artery in collagen gel is evaluated then used in coculture with gingival fibroblasts to evaluate the effect of these fibroblasts on arterial remodeling. The gingival fibroblasts are also cultivated with human aneurismal aortas. Finally our hypothesis is tested on an in vivo model of rabbit aneurism where the cells are transplanted into the lumen. In coculture, the gingival fibroblasts inhibit MMP-9 by an increase of its inhibitor: TIMP-1. Same inhibition is present in cocultures with human aneurismal aortas. The MMP-7 is also inhibited by increase in the TIMP-1 but also at a transcriptional level by an increase of TGF-pl. These cocultures allow the preservation of the arterial elastic network. The transfer of the fibroblasts in aneurisms created in rabbit reduced their diameters and the MMP-9. These results obtained on ex vivo and in vivo models show the capacity of the gingival fibroblasts to preserve the elastic network and to modulate the activity of proteases implied in pathology. The transplantation of gingival fibroblasts seems to be an interesting approach in the treatment of aortic aneurisms. Nevertheless complementary experiments are necessary to confirm our results and to understand how the gingival fibroblast influences remodeling
Alamri, Abdullah, e Abdullah Alamri. "Exposure to cigarette smoke condensate and its impact on human gingival fibroblast: mechanisms of molecular pathways involved in survival/apoptosis". Master's thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26042.
Testo completoNotre objectif est d'étudier les effets de la fumée de cigarette (FC) sur les fibroblastes gingivaux humains. Nos travaux démontrent que FC réduit la viabilité cellulaire cellules vivantes par le biais de la voie apoptotique/nécrotique. Une analyse génomique a montré une surexpression significative de plusieurs gènes dont les gènes de Bax, récepteurs du TNF et caspases; mais une régulation des gènes Lymphotoxin alpha, BCLA1 et BIRC3. Une analyse protéique montant une augmentation des protéines Bax et p53 et de la caspase -3 confirmant l’effet nocif du FC biais un mécanisme apoptotique/nécrotique. Une exposition répétée au FC pendant de courtes périodes, favorise la prolifération cellulaire en augmentant l'activité de la télomérase. En conclusion, ces résultats démontrent qu’à hautes doses la FC est toxique mais à faibles doses la FC provoque une surcroissance cellulaire qui pourrait contribuer au développement des maladies parodontales et des caries.
HOSHINO, TAKESHI, TARO HAYAKAWA, KYOKO YAMASHITA, KOJI NISHIO e HANG LI. "CELL CYCLE-DEPENDENT LOCALIZATION OF TISSUE INHIBITOR OF METALLOPROTEINASES-1 IMMUNOREACTIVITY IN CULTURED HUMAN GINGIVAL FIBROBLASTS". Nagoya University School of Medicine, 1995. http://hdl.handle.net/2237/16089.
Testo completoBattikhi, Tulin. "Treponema Denticola outer membrane extract enhances the phagocytosis of collagen coated-beads by human gingival fibroblasts". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0026/MQ40753.pdf.
Testo completoMustafa, Manal. "Studies on uptake and effect of triclosan on production of inflammatory mediators in human gingival fibroblasts /". Stockholm, 2003. http://diss.kib.ki.se/2003/91-7349-714-2.
Testo completoKunze, Melanie [Verfasser]. "Effizienter Gentransfer in humane parodontale Ligamentzellen und humane gingivale Fibroblasten mittels Adeno assoziierter Virus Vektoren / Melanie Kunze". Köln : Deutsche Zentralbibliothek für Medizin, 2010. http://d-nb.info/1000932621/34.
Testo completoMiranda, i. Rius Jaume. "Estudi de prevalença del dismorfisme gingival, engrandiment gingival en pacients tractats: amb bloquejadors dels canals del calci". Doctoral thesis, Universitat de Barcelona, 1997. http://hdl.handle.net/10803/1186.
Testo completoClàssicament els fàrmacs que s'havien relacionat amb el sobrecreixement gingival eren els antiepilèptics, fonamentalment la fenitoïna. A partir de la dècada dels vuitanta aquesta alteració morfològica també s'ha relacionat amb l'administració d'altres fàrmacs com la ciclosporina A i els bloquejadors dels canals del calci: dihidropiridines, verapamil i diltiazem.
L'engrandiment gingival induït per fàrmacs presenta unes característiques clíniques i anàtomo-patològiques similars, tot i tractar-se de fàrmacs amb una acció terapèutica molt diferent. Això ha fet pensar a molts autors de l'existència d'alguna característica comuna entre ells que expliqués la patogènia del sobrecreixement gingival. En la literatura existeixen nombroses hipòtesis que pretenen explicar aquest dismorfisme, y sembla ser que el mecanisme patogènic seria la combinació de diferents factors: placa bacteriana, presència de fibroblastes gingivals predeterminats genèticament "responder" i l'acció del propi fàrmac. Una característica farmacodinà.mica comuna dels fàrmacs reconeguts com inductors de l'engrandiment gingival és la d'alterar el flux de calci transmembrana, que alhora modificaria el metabolisme dels fibroblastes del teixit connectiu gingival, produint-se un increment dels components de la matriu extracel.lular: fibres de col.làgena i/o substància fonamental amorfa. És per això que el concepte que millor definiria aquesta alteració des d'una vessant clínica seria el d'engrandiment o sobrecreixement gingival, encara que el terme hiperplasia gingival hagi estat utilitzat en la majoria de publicacions científiques.
El sobrecreixement gingival que habitualment s'inicia a la regió de la papil.la interdental, pot afavorir l'aparició de símptomes i signes clínics que inclouen: dolor, sagnat i friabilitat dels teixits, moviments anormals de les dents, alteracions estètiques, fonètiques i de l'oclusió, a més a més d'afavorir l'aparició de càries i d'altres disfuncions periodontals. Constatàrem que la majoria d'individus que presentaven engrandiment gingival aquest havia passat desapercebut tant pel pacient com pel clínic, encara que els afectats per un sobrecreixement més sever si que mañifestaren alguns d'aquests símptomes. L'engrandiment gingival induït per fàrmacs, i en el nostre cas pels calcioantagonistes, s'ha demostrat que pot ser reduït o previngut amb un bon control de la placa bacteriana dirigit a eliminar la inflamació gingival; i en els casos més severs la cirurgia periodontal resectiva és el mètode utilitzat per l'eliminació de l'excés de teixit.
La majoria de publicacions referents a l'engrandiment gingival induït per calciantagonistes, són series de casos amb un nombre reduït de pacients que els realment necessaris en funció de la prevalença estimada per aquest dismorfisme; tampoc s'hi reflecteixen valors que indiquin el risc atribuïble al consum d'aquests fàrmacs, ni comparacions respecte a una població control.
Desenvolupàrem un estudi clínic transversal en l'àmbit de l'atenció primària, CAP Rambla de Terrassa (Barcelona), on s'examinaren els pacients que de forma consecutiva eren visitats en les consultes de medicina general i cardiologia, per conèixer la prevalença, severitat i risc d'engrandiment gingival en la població tractada amb calciantagonistes, i que es comparà amb una població que no rebia cap dels fàrmacs reconeguts com inductors. En l'estudi s'inclogueren 265 pacients: 72 tractats amb dihidropiridines fonamentalment la nifedipina, 32 amb diltiazem, 14 amb verapamil i els 147 subjectes restants foren els controls de la mostra. Es valorà el grau de sobrecreixement gingival en un sentit àpico-coronari (vertical) amb l'índex d'Angelopoulos i Goaz modificat per Miller i Damm -GO-, i en un sentit àntero-posterior (horitzontal/nòdul-papil.lar) amb l'índex de Seymour modificat per Miranda i Brunet MB-. Es considerà que existia engrandiment gingival quan el valor d'algun dels dos índexs era >0 en qualsevol localització. També s'enregistraren: l'índex gingival, l'índex de placa i la profunditat de sondatge, així com les variables sòcio-demogràfiques i qualitatives de tots els individus. Estadísticament s'establiren les diferents comparacions de les variables analitzades amb la prova de Chi Quadrat i quan fou necessari s'utilitzà el Test exacte de Fischer. Es realitzà l'anàlisi bivariant dels factors que poguessin exercir alguna influència sobre els índexs de sobrecreixement gingival. S'evaluà mitjançant un anàlisi mu1tivariant de regressió logística l'Odds Ratio o risc atribuïble al calciantagonista ajustat per les variables de confusió. I finalment es determinà el test de concordança Kappa dels dos índexs utilitzats en la valoració de l'engrandiment gingival (GO i MB).
La prevalença d'engrandiment gingival en la població control fou del 4.1% per l'índex GO i del 7.5% pel d'MB. La prevalença d'engrandiment pel grup casos -bloquejadors dels canals del calci- dels diferents subgrups farmacològics fou: per les dihidropiridines 33.3% (GO) i 51.4% (ME); pel diltiazem 31.3% (GO) i 50% (MB); i pel verapamil 21.4% (GO) - 35.7% (MB); siguent les localitzacions anteriors ínfero-vestibular i súpero-vestibular les més freqüents per ambdós registres. Degut a que l'inici del sobrecreixement habitualment es localitza a nivell de la papil.la interdental, i degut a que l'índex d'MB enregistra l'engrandiment en aquesta regió, això ens explicaria aquesta diferència de freqüències.
En el subgrup de pacients tractats amb nifedipina (n=65) es relacionà la dosi acumulada d'aquest fàrmac amb el grau de sobrecreixement, i encara que a dosis acumulades altes existia una major prevalença d'engrandiment per ambdós índexs, aquest dismorfisme no el podem considerar dosi-depenent. L'edat i el sexe no semblen ser factors determinants en el desenvolupament d'aquest dismorfisme; tampoc per les altres variables qualitatives registrades. Pel que fa a la salut gingival els valors elevats de l'índex gingival (inflamació severa) condicionaren de forma significativa la presència d'engrandiment gingival. Respecte a l'acúmul de placa bacteriana, ambdós grups -casos i controls- presentaren uns índexs similars.
Ja que l'engrandiment induït per fàrmacs és per tant un engrandiment combinat, explicable per la pròpia acció del fàrmac i a la inflamació gingival sobreafegida, és important determinar en quina proporció aquest engrandiment és provocat per un factor o un altre. D'aquesta manera en el grup tractat amb dihidropiridines, quan no es considera la dosi, el risc atribuible al fàrmac seria de 10.6-14.4 (GO-MB) i l'atribuïble a l'alteració de la salut gingival seria de 9.6 per ambdós índexs. En el subgrup tractat amb nifedipina a dosi acumulada alta, el risc atribuïble a aquest fàrmac fou superior, entre 17.4-23.6 (GO-MB) i el relacionat amb la salut gingival es mantingué .invariable per ambdós índexs (9.4). Respecte als altres calciantagonistes, diltiazem i verapamil, el risc fou més superior per l'alteració de la salut gingival que no pas per la presència del fàrmac inductor; aquest fet podria ser degut segurament a la reduïda grandària de la mostra d'aquests dos grups. Es varen detectar diferències de freqüencia d'engrandiment per ambdós índexs; l'índex MB detectava un sobrecreixement en les fases incipients de l'engrandiment que no diagnosticava l'índex GO, encara que després de determinar el grau de concordança o Kappa constàrem que ambdós índexs eren fiables.
L'engrandiment gingival és un dismorfisme habitualment poc conegut pels clínics responsables d'aquests pacients; és per això important difondre valors de prevalença i risc de sobrecreixement gingival pel bon control de la salut periodontal en la població tractada amb bloquejadors dels canals del calci. En un futur caldrà analitzar mostres més àmplies de pacients tractats amb el diltiazem i sobretot amb el verapamil, per així poder determinar les freqüències de sobrecreixement gingival i valorar altres aspectes estudiats amb la nifedipina. Finalment és de suposar que el major consum de dihidropiridines diferents de la nifedipina, permetrà determinar si aquests també són fàrmacs inductors, tal com ja alguns autors estableixen en estudis experimentals i en casos clínics aïllats, i alhora establir en cada cas la seva prevalença.
Gingival enlargement is an abnormal growth of the gingival tissue. It is mainly associated with dental-plaque-related inflammation, some diseases and drug therapy. It has been reported with the use of phenytoin, cyclosporin, and calcium channel antagonist, including dihydropyridinederivatives, veraparnil and diltiazem. This research was designed to study the prevalence of gingival enlargement in general population and in patients taking calcium antagonists. Subjects (n=265) were selected using predefined inclusion-exclusion criteria. The non-treated-control group included 147 patients attended in a general practice center (none had been treated with calcium antagonists). The treated-group included 118 patients taking calcium antagonists (at inclusion time and at least during the last six months). It included 72 patients taking dihydropyridines (65 receiving nifedipine), 32 treated with diltiazem, and 14 with verapamil. Medical history and a complete oral and odontological exploration were done in all patients. It included plaque index, gingival index, probing depth and measures of gingival enlargement in the vertical (GO) and the horizontal (MB) directions. The prevalence of gingival enlargement in the non-treated-control group was 4.1-7.5% when measured by GO and MB, respectively. The patients receiving dihydropyridines had an enlargement prevalence of 33.3-51.4%. Those under diltiazem were 31.3-50% and in the case of verapamil 21.4-35.7%. The most frequents locations for both GO/MB indexes were the anterior lower and the upper-buccal jaw. In the case of nifedipine, the enlargement showed a dose/response relationship when total drog exposition was considered. High rates of gingival index (severe inflammation) produced significant differences in relation to gingival enlargement (p<0.01). No differences were observed in the plaque index. Age and gender did not seem to be determinant factors in the development of overgrowth, the same results were obtained for all other qualitative variables registered. Multivariate statistical analysis showed that the attributable risk (Odds Ratio, OR) of gingival overgrowth related to dihydropyridine treatment was 10.6-14.4 (OR for GO/MB), and the risk related to gingival inflammation was 9.6 for both GO/MB.