Dissertations / Theses on the topic 'EBV cancers'
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Swanson, Anna May. "Novel immunotherapies for EBV-associated cancers." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/2683.
Full textZha, Shuai. "Lanthanide-based nanomaterials for imaging and inhibition of EBV-related cancers." HKBU Institutional Repository, 2020. https://repository.hkbu.edu.hk/etd_oa/731.
Full textJiang, Lijun. "Luminescent bioprobes for imaging and inhibition of EBV associated cancers /Jiang Lijun." HKBU Institutional Repository, 2017. http://repository.hkbu.edu.hk/etd_oa/361.
Full textMovassagh, Mercedeh J. "Comprehensive Computational Assessment And Evaluation of Epstein Barr virus (EBV) Variations, miRNAs, And EBERs in eBL, AML And Across Cancers." eScholarship@UMMS, 2019. https://escholarship.umassmed.edu/gsbs_diss/1022.
Full textJones, Richard Julian. "Novel gene therapy for EBV-associated malignancies." Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274412.
Full textSheng, Wang. "Étude des fonctions oncogènes du virus d'Epstein-Barr (EBV) : détermination des souches du virus impliquées dans les cancers associés à l'EBV en Afrique du Nord : étude de la transformation maligne par l'oncogène viral BARF1 dans les fibroblastes de souris et les lymphocytes B humains." Lyon 1, 2001. http://www.theses.fr/2001LYO1T038.
Full textHui, Kwai-fung, and 許貴鋒. "Induction of epstein-barr virus (EBV) lytic cycle and its cellular consequences in EBV-positive epithelial malignancies." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B47849575.
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Paediatrics and Adolescent Medicine
Doctoral
Doctor of Philosophy
Ling, Guangsheng, and 寧珖聖. "Development of DNA vaccines encoding Epstein-Barr virus (EBV)-specificantigens potentially for EBV-associated nasopharyngeal carcinoma (NPC)immunotherapy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36189121.
Full textLiu, Xuan, and 劉絢. "BARF1 sequence analysis and functional significance in EBV-Related disorders." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36190445.
Full textFitzsimmons, Leah. "Investigating the anti-apoptotic role of EBV in endemic Burkitt lymphona." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5717/.
Full textHeath, Emily. "Studies of EBV infection of B Lymphocytes ex Vivo and in Vitro." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1714/.
Full textHussain, Mushtaq. "Phylogenomic and structure-function relationship studies of proteins involved in EBV associated oncogenesis." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/5357/.
Full textCurran, John Andrew. "The oncogenic activity of the latent membrane protein of EBV in transgenic mice." Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388552.
Full textZheng, Ying, and 鄭盈. "A complementary activation of peripheral NK cell immunity in EBV related nasopharyngeal carcinoma." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B34605162.
Full textEsteves, Marlene Duarte. "Infeção por HPV e EBV em tumores de cabeça e pescoço." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12072.
Full textO cancro de cabeça e pescoço é o quinto com maior incidência em Portugal e representa um grave problema de saúde pública com cerca de 43 000 novos casos por ano. Adicionalmente ao tabaco e álcool, os vírus foram também associados ao desenvolvimento deste tipo de patologias, nomeadamente o Vírus do Papiloma Humano e o Vírus Epstein-Barr. Os objetivos deste estudo foram caracterizar a prevalência da infeção pelo EBV e HPV nos tumores de cabeça e pescoço; comparar a prevalência viral nas diferentes amostras; e avaliar a presença de DNA viral na saliva como possível biomarcador preditivo do cancro de cabeça e pescoço. O estudo foi realizado em 68 doentes (3 mulheres e 65 homens) diagnosticados com HNC, com uma idade mediana de 55 anos (34-87). A infeção por HPV foi detetada em DNA de amostras de saliva e tecido por PCR. A deteção de EBV foi feita usando um protocolo in house de PCR em tempo real. A frequência geral da infeção na saliva foi 2.9% (2/66) para o HPV e 74.2% (49/66) para o EBV. Nos tecidos a prevalência da infeção foi 7.1% (3/40) para o HPV e 52.4% (22/40) para o EBV. Apesar de apenas existirem 2 casos positivos na saliva e 3 nos tecidos, a genotipagem revelou 4 casos positivos para HPV 16. Observamos que não existe excreção de HPV na saliva dos doentes com carcinomas HPV negativos, enquanto que em 2 dos 3 carcinomas HPV positivos observou-se a excreção e HPV, o que nos leva a concluir que a excreção de HPV na saliva deverá ser estudada como um possível marcador de patologia maligna da cavidade oral. Pelo contrário, relativamente ao EBV, concluímos que a excreção de EBV na saliva não pode ser utilizada como biomarcador preditivo da existência de carcinoma de cabeça e pescoço, uma vez que nos casos de carcinoma EBV negativos existe igualmente excreção de EBV na saliva.
Head and neck cancer (HNC) is the fifth most frequently in Portugal and is a serious public health problem with almost 43.000 new cases per year. Besides tobacco smoke and alcohol, viruses were associated with the development of HNC, in particular Human Papillomavirus and Epstein-Barr virus (EBV). The aim of this study was to characterize the prevalence of HPV, and EBV in saliva and tissue samples of head and neck cancer patients. This study was performed with 68 patients (3 women and 65 men), diagnosed with HNC with median age 55 years old (range 34-87). Infection of HPV was detected in DNA saliva and tissue by PCR using consensus primers and genotyping was performed by restriction fragment length polymorphism (RFLP). Detection of EBV was performed using an in house Real time-PCR protocol. The overall frequency of infection in saliva was 2.9% (2/66) for HPV and 74.2% (49/66) for EBV. In tissues, the prevalence of infection was 7.1% (3/40) for HPV and 52.4% (22/40) for EBV. Despite only 2 positive cases in saliva and 3 in tissues, genotyping revealed 4 cases to be HPV16 positive. It was observed that there was no excretion of HPV in saliva in patients with HPV negative carcinoma, while in two of the three HPV positive carcinoma occurred excretion of HPV, leading to the conclusion that HPV excretion in saliva must be studied as a possible marker of malignancy of the oral cavity. In contrast, we have concluded that the excretion of EBV in saliva cannot be used as a biomarker predictive of the presence of carcinoma of the head and neck, such as in carcinoma EBV-negative has also occurred excretion of EBV in saliva.
Wong, Hing-lok, and 黃慶樂. "Functional study of the EBV-encoded RNAs (EBERs) in nasopharyngeal epithelial cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B32004059.
Full textKao, Kuan-Yu. "Control of the EBV growth transformation programme : the importance of the Bamhi W repeats." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1493/.
Full textLiu, Yu, and 劉鈺. "Biological properties of EBV-encoded latent membrane protein 1 in nasopharyngeal epithelial cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31242078.
Full textQuinn, Laura. "EBV immune evasion genes modulating CD8+ T cell recognition during lytic cycle replication." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4559/.
Full textQureshi, Muhammad Asif. "Dissecting the role of LMP1 (CAO) induced chronic inflammation in EBV associated carcinogenesis." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3404/.
Full textZhang, Guitao, and 张贵焘. "Epstein-barr virus (EBV) infection and STAT3 activation in nasopharyngeal epithelial cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hdl.handle.net/10722/209213.
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Anatomy
Doctoral
Doctor of Philosophy
Gourzones, Claire. "Libération extra-cellulaire de microARN et de complexes nucléo-protéiques par les cellules infectées par EBV : rôle des exosomes et d’autres transporteurs." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA11T072/document.
Full textThe study of tumoral microenvironment should take into account different modes of intercellular communications: direct contacts between extracellular membranes, secretion and uptake of cytokines and finally emission and uptake of complex biological objects like exosomes and microvesicles.Epstein-Barr virus (EBV) is associated with several human malignancies of epithelial origin (Nasopharyngeal carcinoma or NPC) or of lymphoïd origin (post-transplant lymphoproliferative disorder or PTLD). In these tumors, malignant cells are latently infected by EBV and release exosomes and microvesicles containing viral nucleic acids and proteins. Studying them will enable a better understanding of tumor-host interactions and the discovery of new markers which could be useful for early diagnostic and the follow-up of the disease under treatment.The first aim of this thesis was to study the release by malignant cells of EBV microRNAs belonging to the BART family and their blood diffusion in patients bearing NPC tumors. For the first time, I’ve shown that exosomes released by NPC cells in vitro contain EBV miR-BART microRNAs. Moreover, ebv-miR-BART7 can be detected in the plasma of NPC patients. Unlike what is observed in vitro, circulating BART microRNAs are not carried by exosomes. Recent data from studies in xenografted mice show that they are carried by extra-cellular complexes which can be immunoprecipitated by anti-Ago2 antibodies. We are currently trying to confirm these data in plasma from NPC patients. This work will ease the use of miR-BARTs as potential biomarkers.The second aim was to study the proteome modifications induced by the EBV Latent Membrane Protein 1 protein (LMP1). I’ve shown that LMP1 expression in lymphoid or epithelial cells infected or not by EBV induces the release of PARP1 in the extra-cellular space. This extra-cellular PARP1 is not carried by exosomes or microvesicles but is embedded in non-vesicular nano-objects containing histones and DNA. We have called these objects “DNA-proteins complexes”. We don’t know how they are produced and released by cells. We think that they are not only secreted by apoptotic cells. Recent data show that this release of extra-cellular PARP1 is associated with PARP1 activation by LMP1 oncoprotein expression. We are trying to prove this hypothesis using cell lines expressing wild type or mutated LMP1. The release and the activation of PARP1 induced by LMP1 expression will help to understand the mechanisms of EBV-associated oncogenesis and auto-immunity
Frumento, Guido. "Preclinical development of adoptive T-cell immunotherapy for EBV-associated diseases using third-party donors." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8364/.
Full textThomas, Olivia Grace. "Epstein-Barr virus and multiple sclerosis : investigating EBV antigen-induced T-cell cross-recognition of central nervous system proteins." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7961/.
Full textFarrell, Katrina. "The biological basis and clinical correlates of the association between EBV-positive Hodgkin lymphoma and HLA class I." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4900/.
Full textShojaeian, Jalouli Miranda. "Oral cancer with special reference to virus detection and quantitative gene expression." Doctoral thesis, Uppsala universitet, Käkkirurgi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-275516.
Full textSanford, Daniel C. "C/EBP delta expression and function in prostate cancer biology." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1141421403.
Full textMallard, Eric. "Caractérisation de lymphocytes T effecteurs et mémoires en situations physiologique et pathologique." Paris 6, 2005. http://www.theses.fr/2005PA066225.
Full textBouvier, Guy. "Étude des interactions carcinogènes chimiques et virales dans le NPC : caractérisation des substances activatrices de la réplication du virus d'Epstein-Barr (EBV) à partir de conserves alimentaires." Lyon 1, 1992. http://www.theses.fr/1992LYO1T175.
Full textSilva, Naiara Soares Melo da. "Estudo sobre a expressão da metaloproteinase de matriz 7 (MMP-7), a infecção pelos Vírus HPV e EBV e o grau de malignidade de lesões do colo uterino." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/8502.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Cervical cancer is the second largest cause of deaths from malignant cancer among women worldwide. Many studies show the importance of the HPV virus in the onset of cervical cancer, but because of the monoclonal nature of this cancer, it is suspected that HPV infection may not be considered the only causal factor responsible for the development of cervical carcinoma. Studies have indicated that EBV may have a role in cooperation with the HPV16 tumor development. Such cooperation could influence the tumor microenvironment by creating a favorable niche for its progression. Cancer cells secrete enzymes that degrade the extracellular matrix (ECM). Such enzymes such as matrix metalloproteinases (MMPs) facilitate cell movement in tissues and induce the activity of growth factors that promote angiogenesis. Among the group of MMPs, MMP-7 seems to have a crucial role in the development of carcinogenesis, since its action has been associated with the cleavage and release of adhesion molecules important. In this sense, this study was performed to establish the relationship between the HPV coinfection / EBV and expression of MMP-7. They were examined immunohistochemically histological slides of cervical lesions biopsies of 60 patients aged 35 to 65 years. The samples were divided into high grade lesion and low grade and evaluated semiquantitatively by scoring system ranging from 0 to +++. Histopathological indexes the degree of injury were established. It observed a statistically significant association between high-grade lesion, the expression of MMP-7 and the presence of the HPV virus, with p = 0.007 at the junction portion squamocolumnar and p = 0.023 in the portion of the ectocervix. This correlation
O câncer cervical é responsável pela segunda maior causa de mortes por neoplasia malignas entre as mulheres no mundo. Muitos estudos comprovam a importância do vírus HPV no surgimento do câncer cervical, porém devido à natureza monoclonal desta neoplasia, suspeita-se que a infecção pelo HPV não possa ser considerada o único fator causal responsável pelo desenvolvimento do carcinoma de colo de útero. Estudos já apontaram que o EBV pode ter um papel de cooperação com o HPV16 no desenvolvimento tumoral. Tal cooperação poderia influenciar o microambiente tumoral criando um nicho favorável para a sua progressão. Células de câncer secretam enzimas que degradam a matriz extracelular (MEC). Tais enzimas, como as metaloproteinases de matriz (MMPs) facilitam a movimentação celular nos tecidos e induzem a atividade de fatores de crescimento que promovem a angiogênese. Dentre o grupo das MMPs, a MMP-7 parece ter papel crucial no desenvolvimento da carcinogênese, pois sua ação já foi associada com a clivagem e a liberação de importantes moléculas de adesão. Neste sentido, foi realizado este estudo para estabelecer a relação entre a co-infecção HPV/EBV e a expressão da MMP-7. Foram examinadas imunohistoquimicamente lâminas histológicas de biópsias de lesões de colo uterino de 60 pacientes com idades entre 35 e 65 anos. As amostras foram divididas em lesão de alto grau e de baixo grau e avaliados semiquantitativamente através de um sistema de escore variando de 0 à +++. Índices histopatológicos quanto ao grau das lesões foram estabelecidos. Foi observada uma associação estatisticamente significante entre a lesão de alto grau, a expressão da MMP-7 e a presença do vírus HPV, com p=0,007 na porção da junção escamocolunar e p=0,023 na porção da ectocérvice.
Bouguenina, Mohammed El Habib. "La protéine SMYLE (Short MYomegalin Like EB1 binding protein) dans l'organisation d'un complexe centrosomal, la régulation de la nucléation et la stabilisation des microtubules : conséquences sur la migration et la division des cellules cancéreuses." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM5060.
Full textMicrotubules (MT) are dynamic polymers anchored by their minus ends at the MT organizing centers while their highly dynamic plus end explores the cytoplasm until it get stabilized. This plus end capture allows the organization of the MT network. +TIPs are a group of proteins that share the commonality to associate either directly or indirectly to MT plus ends. EB1 is a central protein of the +TIP network that regulates MT dynamics and their interactions with plus end anchoring structures. Using targeted proteomics, we have characterized the EB1 interactome and revealed a set of protein previously shown to associate with the nucleating centers that included AKAP9 an anchoring protein for protein kinase A (PKA), the pericentriolar matrix protein CDK5RAP2 and a short Myomegalin isoform that we named SMYLE (Short MYomegalin Like EB1 binding protein). Molecular mapping revealed that the proteins formed a hierarchically organized complex. We have observed that the transient association of SMYLE to the newly nucleated MTs at the centrosome favored the nucleation and acetylation. Interestingly, SMYLE depletion led to MT nucleation defects, but also a disruption of cortical MT capture. These defects in the MT network were associated with a steep fall in the migratory potential of breast cancer cells and mitotic abnormalities. Our results allow proposing that SMYLE belongs to centrosomal supramolecular complex that favors the assembly and stability of newly nucleated MTs, thus contributing to major processes in tumor development
Reis, Leonardo Oliveira 1978. "Bacilo Calmette-Guerin (BCG) e enterotoxina B do Staphylococcus aureus (EBS) no tratamento do câncer não músculo invasivo de bexiga urinária de ratos." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/312205.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciências Médicas
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Resumo: O tratamento do câncer de bexiga urotelial não músculo invasivo (CBNMI) com Bacilo Calmette-Guerin (BCG) tem efeito comprovado na redução de recidiva tumoral, embora ocorram efeitos colaterais de intensidades variadas, desde sintomas irritativos leves até reação sistêmica grave e o impacto na progressão tumoral seja controverso. Neste cenário a enterotoxina B do Staphylococcus aureus (EBS) destaca-se como alternativa promissora na terapêutica do CBNMI. Assim, os objetivos principais do presente estudo foram comparar e caracterizar os efeitos morfológicos, antiangiogênicos e o balanço entre proliferação e apoptose das imunoterapias com BCG, EBS e BCG-EBS no tratamento do CBNMI de ratos induzidos quimicamente. Um total de 75 ratas da linhagem Fisher 344 foram utilizadas. Para a indução do câncer, 60 animais foram anestesiados e receberam uma dose intravesical de 1,5mg/kg de N-metil-N-nitrosouréia (MNU) a cada 15 dias, nas semanas 0, 2, 4 e 6 (4 doses). Os outros 15 animais receberam 0,3ml de solução fisiológica intravesical e constituíram o grupo Controle (CT). Após o período de indução com MNU, os animais foram divididos em 5 grupos (15 animais cada): grupo MNU: recebeu o mesmo tratamento que o grupo CT - 0,3 ml de solução fisiológica intravesical; grupo BCG: recebeu dose intravesical de 106 UFC (2x106 UFC/mg) de BCG; grupo EBS: recebeu dose intravesical de 10?g/ml de EBS; grupo BCG-EBS: recebeu tratamento simultâneo com BCG e EBS nas mesmas concentrações que nos grupos BCG e EBS; todos por 6 semanas consecutivas. Após 15 semanas de protocolo, os animais foram sacrificados e as bexigas urinárias coletadas e submetidas às análises histopatológica, imunohistoquímica e Western Blotting. Os resultados demonstraram que as alterações histopatológicas mais frequentes em cada grupo foram carcinoma papilífero e carcinoma in situ no grupo MNU, hiperplasia papilífera nos grupos BCG e EBS e hiperplasia plana no grupo BCG-EBS. Não houve toxicidade relevante. Os índices apoptótico e proliferativo foram aumentados em todos os grupos de tratamento. Contudo, esses índices foram menores nos grupos BCG, EBS e BCG-EBS em relação ao grupo MNU. Intensas imunorreatividades para VEGF, MMP-9 e IGFR-1 foram verificadas no grupo MNU; moderadas nos grupos BCG e EBS; e fracas nos grupos BCG-EBS e Controle. Em contraste, intensa imunorreatividade para endostatina foi verificada nos grupos Controle e BCG-EBS em relação aos demais grupos experimentais. Assim, pode-se concluir que o tratamento associado BCG-EBS foi mais eficaz em restaurar o equilíbrio entre os processos de apoptose e proliferação celular e as alterações histopatológicas do que os tratamentos isolados com BCG e EBS. Além disso, a diminuição da proliferação celular e das alterações histopatológicas correlacionaram-se com o aumento da reatividade para endostatina e diminuição das reatividades para VEGF, IGFR-1 e MMP-9. A associação entre BCG e EBS abre uma nova perspectiva terapêutica no CBNMI
Abstract: PURPOSE: Compare and characterize effects of intravesical Bacillus Calmette-Guerin (BCG), Staphylococcal Enterotoxin B (SEB) and BCG plus SEB treatments in the non-muscle invasive bladder cancer (NMIBC). METHODS: Seventy-five female Fisher 344 rats were anesthetized and 15 of them received 0.3 ml of saline (Control group), 60 animals received 1.5 mg/kg dose of N-methyl-N-nitrosourea (MNU), all intravesically every other week for 6 weeks. The rats were divided into 5 groups: MNU and Control groups received 0.3 ml of saline; BCG group received 106 CFU dose of BCG; SEB group received 10 ?g/ml dose of SEB and BCG-SEB group received simultaneous BCG and SEB, all intravesically for 6 weeks. After 15 weeks, all urinary bladders were collected for histopathological, immunological and Western Blotting analyses. RESULTS: Papillary carcinoma (pTa) and high-grade intraepithelial neoplasia (carcinoma in situ) were more often in MNU group, papillary hyperplasia in BCG and SEB groups and flat hyperplasia in BCG-SEB group. No significant toxicity was observed. Apoptosis and cellular proliferation indexes decreased in BCG, SEB and BCG-SEB groups compared to MNU group. Intensified VEGF, MMP-9, Ki-67 and IGFR-1 immunoreactivities were verified in the MNU group; moderate in the BCG and SEB groups; and weak in the BCG-SEB and Control groups. In contrast, intense endostatin immunoreactivity was verified in the Control and BCG-SEB groups. CONCLUSIONS: BCG and SEB presented similar anti-angiogenic effects. BCG-SEB treatment showed an additional activity compared to monotherapy, being more effective in restoring apoptosis and cellular proliferation balance, correlating with increased endostatin and decreased VEGF, MMP-9, Ki-67 and IGFR-1 reactivities
Doutorado
Fisiopatologia Cirúrgica
Doutor em Ciências
Zhang, Yingjie. "Molecular mechanisms of transcriptional control of C/EBPD expression in mammary epithelial cells and functional analysis of C/EBP[delta] in contact inhibition." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1157134598.
Full textGrabner, Enrico. "Untersuchung von Promotormethylierungen des p16-Gens im Atemkondensat von Patienten mit Bronchialkarzinom und Vergleich mit Tumorpräparaten." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-158654.
Full textBuffet, Camille. "Anomalies moléculaires de la voie MAPK et cancer papillaire de la thyroïde : étude de deux phosphatases spécifiques de ERK, DUSP5 et DUSP6." Thesis, Paris 5, 2014. http://www.theses.fr/2014PA05T049/document.
Full textPapillary thyroid cancer (PTC) is the most common endocrine malignancy. Mutually exclusive and activating alterations of the MAPK pathway (Mitogen-Activated Protein Kinases) are identified in 70% of cases. Common mutations found in PTCs are point mutation of the B-RAF (50%) and RAS genes (10%) as well as RET/PTC chromosomal rearrangements (10%). The hot spot B-RAFV600E mutation is the most frequently alteration identified and is connected with agressive clinical characteristics (high stage at diagnosis, high recurrence risk and death). These molecular events lead to constitutive activation of the MAPK pathway, resulting in MEK (Mitogen-activated Extracellular signal-Regulated Kinase) and ERK (Extracellular signal-Regulated Kinase) phosphorylation. ERK is negatively regulated by phosphatases and among them, Dual Specificity Phosphatases (DUSPs), ubiquitary expressed, in particular two ERK-specific phosphatases DUSP5 (nuclear) and DUSP6 (cytosolic). We hypothesized that these phosphatases could have tumor supressor properties (i.e. their loss would be associated with an increase in MAPK pathway activation) or may serve as a surrogate marker of MAPK pathway activation in the context of a negative feedback loop. We analysed regulation and expression of both phosphatases in 3 models: three PCCL3 cell lines (rat thyroid cells) expressing one of the most common oncogene identified in PTCs (RET/PTC3 or H-RASV12 or B-RAFV600E) under the control of a doxycycline-inducible promoter, human PTC-derived cell lines and human PTC. We demonstrated that MAPK pathway activation was correlated with induction of DUSP5 and DUSP6. These phosphatases are involved in a negative feedback loop that contributes to a tight regulation of phospho-ERK levels. DUSP5 and DUSP6 mRNA are overexpressed in human PTCs, especially in B-RAF mutated tumors suggesting a higher MAPK signaling output in these agressive PTCs. Silencing of DUSP5 and/or DUSP6 by small interfering RNA does not affect proliferation of human B-RAFV600E thyroid carcinoma-derived cell lines, suggesting the lack of tumor suppressor gene role. Compensatory changes in expression of DUSPs when a specific one is inactivated may explain this lack of effect. On the opposite, a DUSP6 pharmacological inhibitor induced a concentration dependent decrease in proliferation of human B-RAFV600E cells, suggesting « off-target » effect of this inhibitor. In a second part, we analysed the regulation of DUSP5 expression, which is a target of the MAPK pathway activation. We demonstrated, using pharmacological inhibitors, that DUSP5 is an early response gene, regulated mostly by the MAPK pathway, at the transcriptional level. Two contiguous CArG boxes that bind serum response factor (SRF) were found in a 1Kb promoter region, as well as several E twenty-six transcription factor family binding sites (EBS). These sites potentially bind Elk-1, a transcription factor activated by ERK1/2. Using wild type or mutated DUSP5 promoter reporters, we demonstrated that SRF plays a crucial role in serum induction of DUSP5 promoter activity, the proximal CArG box being important for SRF binding in vitro and in living cells. Moreover Elk-1 was bound in vitro to a promoter region containing the proximal CArG box and a putative EBS. Its specific binding to SRF was necessary to elicit promoter response to dominant positive Elk-VP16 and to enhance the response to serum stimulation. Altogether our results suggest that the MAPK pathway is more active in B-RAFV600E PTC than in PTC with other genetic alteration and could explain their clinical agressivity. DUSP5 and DUSP6, as well as phosphorylated MEK, are markers of activation of the MAPK pathway. Neither phosphatase has tumor suppressor properties in our thyroid cancer cell models. Our results suggest redundancy and functional compensation among DUSPs. (...)
Sivko, Gloria S. BS DV M. "Characterization and regulation of C/EBPδ in human mammary epithelial cell G0 growth arrest." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1082580020.
Full textAstarci, Erhan. "Investigation Of The Inflammatory Pathways In Spontaneously Differentiating Caco-2 Cells." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613507/index.pdf.
Full text) acted downstream of PKC to inactivate Inhibitor of kappa B (IB) and activate NF-&kappa
B in the undifferentiated cells and this axis was inhibited in the differentiated cells. The increase in ICAM1 expression in the differentiated cells was due to a transcriptional upregulation by C/EBP. The protein expressions of both ICAM-1 and VCAM-1, however, were found to decrease in the course of differentiation, with both proteins getting post-translationally degraded in the lysosome. Functionally, a decrease in adhesion to HUVEC cells was observed in the differentiated Caco-2 cells. Thus, the regulation of ICAM-1 and VCAM-1, although both NF-B target genes, appear to be different in the course of epithelial differentiation. microRNAs are known to regulate many cellular pathways. miR-146a, which is known to target NF-&kappa
B, was shown to be highly upregulated in differentiated Caco-2 cells. As a predicted target of miR-146a, mRNA and protein expression of MMP16 was inversely correlated with miR-146a during differentiation of Caco-2 cells. miR-146a could bind to the 3&rsquo
UTR of MMP16 and ectopic expression of miR-146a resulted in a decreased mRNA and protein expression of MMP16 in the undifferentiated Caco-2 and HT-29 cells. Functionally, decreased gelatinase activity determined by gelatin zymography and reduced invasion and migration through Transwells was observed. In the final part of the thesis, the inhibition of NF-&kappa
B via PPAR&gamma
in 15-Lipoxygenase-1 (15LOX1) expressing cells was investigated. The expression of 15LOX1, a member of the inflammatory arachidonate cascade, could lower phosphorylation of I&kappa
B&alpha
and NF-&kappa
B DNA binding activity which was reversed with a 15LOX1 inhibitor. This inhibition was mediated by phospho-PPAR&gamma
, which in turn was phosphorylated by ERK1/2.
Coulibaly, Tata Safiatou. "Double approche à la thérapie anti-tumorale à l'aide de vecteurs lentiviraux." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAJ087/document.
Full textCancer gene therapy requires the use of an effective suicide gene and the specific targeting of cancer cells. In my PhD work, I have first characterized a new potential suicide gene derived from human deoxycytidine kinase (dCK): M36. Compared to dCK, M36 improves sensitization of certain cancer cells to treatment with chemotherapeutic compounds as gemcitabine and AraC. These results are particularly encouraging for the elimination of cancer cells resistant to the treatment because of a defect with dCK. In a second part, I have worked at the proof of concept that a modified HIV envelope can allow specific targeting of cancer cells by lentiviral vectors. During this work, I have generated a CD4i envelope with a strongly diminished natural tropism and that carries a motif known to bind the model cell surface cancer marker HER2. This envelope constitutes a good starting material to be improved by evolution in cell culture to obtain specific targeting of HER2+ cells
Malenfant, Daniel. "Étude des fonctions développementales et métaboliques du récepteur nucléaire fetoprotein transcription factor (FTF)." Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/28755/28755.pdf.
Full textFTF is a nuclear receptor principally expressed in adult digestive organs that has been shown to act as a major regulator of lipids and steroids metabolism, cellular proliferation and embryonic development. FTF involvement in steroid synthesis and cell cycle regulation tends toward the stimulation of tumor proliferation in neoplasic tissues in which FTF is expressed. However, more studies of FTF function in normal and disease states and on its regulation are needed to draw a complete picture of FTF activity in cell physiology. Within the context of my studies, I delineated the FTF adult and fetal tissular expression, characterized a novel Ftf promoter element and identified FTF direct hepatic transcriptional targets in fetal, adult and tumor cell lines by using chromatin immunoprecipitation (ChIP-on-chip). These studies defined new FTF functions in metabolism, fetal development and hepatic carcinogenesis. FTF expression in digestive system and in neural structures controlling eating behavior, its transcriptional regulation by metabolic nuclear receptors and its binding to enzyme and transporter gene promoters driving energy metabolism, puts FTF in a key location for governing cellular and organismal energy metabolism. C/EBP, a transcriptional FTF partner on the Afp gene promoter and also involved in energy metabolism, is bound to 20% of the FTF targets including FTF itself thus adding branches to the complex hepatic transcriptional network. In hepatoma cells, FTF binds to proliferation and tumor cell maintenance genes like replication, growth and apoptosis regulators. Therefore, FTF belongs to the hepatic transcription network that governs hepatic development, differentiation and adult energy metabolism and is likely to be involved in promoting hepatic tumorogenesis.
Litteral, Vaughn. "mdm2 Amplification in NIH3T3L1 Preadipocytes Leads to Mdm2 Elevation in Terminal Adipogenesis." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1216825497.
Full textSpence, James Michael. "A Comparison of Major Factors that Affect Hospital Formulary Decision-Making by Three Groups of Prescribers." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1157518/.
Full textOliveira, Andreia Fernanda Nora de. "Characterization of EBV-associated gastric cancers." Master's thesis, 2014. http://hdl.handle.net/10400.14/20133.
Full textWorldwide, Gastric Cancer (GC) is the sixth most common malignancy with nearly 1 million new cases estimated in 2012. In Portugal, data reveal that GC is the fifth most frequent cancer with about 3000 new cases per year. Moreover GC has still a higher mortality rates being responsible for 1387 deaths in men and 898 in women. Recent data showed that Epstein-Barr virus (EBV) has been detected in different histopathological subtypes of gastric carcinoma and EBV-associated gastric carcinoma (EBVaGC) accounts about 10% of all cases. This study pretends to characterize EBVaGC in our population through detection of EBV in gastric carcinoma tissues from 136 consecutive patients attended at Portuguese Institute of Oncology of Porto (IPO Porto FG EPE) in the year of 2011. EBV detection was performed by in situ hybridization (ISH) targeting EBV-encoded small RNA (EBER-ISH) with an EBER-DNA probe. The results showed that in our population EBVaGC represent 6.6% of all GC cases. Analyzing the distribution of EBV among the different histological types, we observed that EBV was present in 6.6% of intestinal-types, 11.1% of indeterminate types, 100% of lymphoepithelioma-like carcinomas and there were no positive cases among diffuse types (p<0.001). The risk analysis revealed that, despite there are not statistically significant differences, patients with intestinal (p=0.350; OR= 1.98, 95% CI=0.37-10.5) and indeterminate (p=0.238; OR=2.78, 95% CI=0.55-15.5) GC have an increased risk of having an EBVaGC; while diffuse GC (p=0.078; OR=0.14, 95% CI=0.01-2.58) have a decreased risk of having an EBVaGC. Regarding tumor location, the results demonstrated that patients with tumors in upper regions of stomach have an increased risk to have an EBVaGC (p=0.032; OR=4.68, 95% CI=1.11-19.7). In conclusion, the EBV infection rate among gastric carcinomas in Portugal is similar to that ascertained in other countries. Conversely, the clinicopathological features showed differences when compared with previous studies, mainly the absence of EBV in diffuse-type gastric carcinomas. This is the first study to characterize EBVaGC in Portugal which reinforce the need of further studies to clarify the role of EBV and to explore its potential value as predictive/prognostic biomarker in gastric cancer development.
"Epstein-Barr virus (EBV) genotyping in EBV-associated lesions." 2004. http://library.cuhk.edu.hk/record=b6073701.
Full text"June 2004."
Thesis (Ph.D.)--Chinese University of Hong Kong, 2004.
Includes bibliographical references (p. 137-149).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Mode of access: World Wide Web.
Abstracts in English and Chinese.
Lin, Jiun-Han, and 林君翰. "EBV enhances tumorigenic activity in human breast cancer cells." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/59178651202536748723.
Full text國立臺灣大學
生物化學暨分子生物學研究所
95
Epstein-Barr virus (EBV) is a ubiquitous human γ-herpesvirus estimated to have infected about 95% of the adult population worldwide. EBV is associated with certain malignancies, such as Burkitt lymphoma, Hodgkin lymphoma and nasopharyngeal carcinoma. Several laboratories have reported recently that EBV may also be involved in the pathogenesis of breast carcinoma, the most frequently diagnosed malignancies in women. In our laboratory, the presence of the EBV genome in breast tumors (66/140, 47.14%) and in normal tissues adjacent to breasr tumors (1/12, 8.3%) indicated that EBV was mainly detected in tumors. After statistical data analysis, EBV was correlated with poor prognosis in breast cancer. It suggested that EBV might be related to the development of some breast carcinomas. To investigate the potential role of EBV in breast cancer, we established EBV-infected breast cancer cell lines, MCF7-A and BT474-A. Three EBV latency genes (EBNA1, EBER1, and BARF0) were expressed in EBV-infected breast cancer cells and this pattern was typical of EBV latency I. EBV-infected MCF7-A and BT474-A cells exhibited increased anchorage-independent growth in soft agar. HER2 (also known as Neu, ErbB2) is a member of the epidermial growth factor receptor (EGFR; HER1/ErbB1) family of receptor tyrosine kinases (RTKs), which also includes HER3(ErbB3) and HER4(ErbB4). Amplification and overexpression of the HER2 proto-oncogene is observed in 20–30% of human breast cancers and is correlated with poor prognosis and decreased patient survival. Moreover, EBV infection enhances expression of HER2 and HER3 gene, and formation of HER2/HER3 heterodimer. HER2/HER3 heterodimer also stimulated phosphorylation of the phosphatidylinositol 3''-kinase (PI3K)-dependent effector kinase Akt, as well as that of the MEK-dependent mitogen-activated kinase (MAPK), extracellular signal-regulated kinase (ERK). To realize the role of HER2/HER3 in anchorage-independent growth, cells were seeded in the soft agar in the presence of an anti-HER2 antibody, herceptin, PI3K inhibitor LY294002 or the MEK inhibitor U0126. The ability of colony formation in soft agar was substantially reduced by either herceptin or the PI3K inhibitor LY294002 or the MEK inhibitor U0126 in MCF7-A cells. In the other hand, the oncogenic potential of Wnt proteins in the mammary gland has been amply demonstrated in mouse models, and it is clear that at least distal components of the Wnt/β-catenin pathway are activated in majority of breast carcinomas. The evidence for this includes elevated levels of cytoplasmic β-catenin, the frequent presence of β-catenin in the nucleus, and expression of transcriptional targets of β-catenin such as cyclin D1. In our study, EBV infection enhances expression and accumulation of β-catenin, and activates expression of β-catenin target genes, c-MYC and cyclin D1. Next, it was examined which of the three EBV genes expressed in these cells (EBNA1, EBER1 and BARF0) was responsible for HER2/HER3 and β-catenin expression. Consequently, we showed that BARF0 alone was sufficient to efficiently up-regulate HER2/HER3 and β-catenin expression and promoted tumorigenic activity in MCF7 and BT474 cells by both overexpression and small interfering RNA knock-down. According to the luciferase reporter assay, expression of BARF0 resulted in 9.1- and 8.3-fold transcriptional activation of the HER2 and HER3 promoter construct in MCF7 cells, respectively. Stably BARF0-tranfected MCF7 cells formed more colonies in soft agar than parental cells. Meanwhile, we found that BARF0 enhances the expression of MMP2 in BT474 cells. And then BARF0 promotes BT474 cells migration and invasion ability through activating β-catenin signaling by PI3K/AKT pathway. These findings imply that BARF0 is likely to enhance the breast cancer tumorigenic activity through activating HER2/HER3 and β-catenin signaling pathway.
Wu, Hsiang-yi, and 吳香儀. "Genetic Alternations In EBV-infected Breast Cancer Cell Lines." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/48252364424495691500.
Full text國立臺灣大學
生物化學暨分子生物學研究所
91
Breast cancer is the most common fatal malignancy cancer of females in developed countries. From 1970 to 1990, breast cancer is an important cancer of women in Taiwan and the incidence of age in breast cancer trends to early onset. The etiology of breast cancer involves a complex interplay of genetic, hormonal, and dietary factor that are superimposed on the physiological status of the host. At the molecular level, several oncogenes and tumor suppressor genes were shown to be involved in the development of breast cancer. At 1995, EBV was first detected in human breast cancers then several reports further indicated the presence of EBV in the 20%-50% breast tissue. So our laboratory is interested in developing effective analysis to examine the existence of Epstein-Barr virus(EBV)genome and gene product(s) in breast cancer specimens from Taiwan. We want to know what is the role of EBV in breast cancer carcinogenesis. Some reports indicate that one of the EBNA-1 associated cellular protein ,p32/TAP, was important for RNA splicing. Therefore, we propose a hypothesis that through EBNA-1 and p32/TAP interaction, EBV may enhance the relaxation of RNA fidelity of the host cell. Then the consequent result may cause the mutation of TSG101 and ERα (estrogen receptor alpha). In order to test this hypothesis, we compare the mutation frequency of TSG101 and ERα between parental and EBV-infected breast cancer cell lines and some other cancer cell lines. We also want to know wheather EBV will affect the cellular gene(s) in DNA level .Therefore, the status of p53 between parental and EBV-infected cells has been analyzed as well. Our results pointed out that increase of TSG101 aberrant splicing transcripts has been found in EBV-infected HBL-100-A,T47D-A and A431-A cells. In addition, our result indicated that increase of ERα alternative splicing transcripts has been found in these EBV-infected cells. These data strongly support the hypothesis that EBNA-1 and p32/TAP interaction, EBV may enhance the relaxation of RNA fidelity of the host cell. Then the consequent result may cause the mutation of TSG101 and ERα. According to this excited discovery, the inter-relationship of EBV and those genetic alterations will provide important clues to elucidate the possible role of EBV in carcinogensis although the p53 status has not been affected after EBV infection. Our results pointed out that EBV might involve in breast cancer progression. However, many other mechanistic aspects underlying EBV-mediated transcription are still unclear. For instance, how EBV promotes cellular proliferation through TSG101 and ERα? What specific regulatory genes are involved in this growth pathway? What EBV-stimulated cell cycle signal transduction pathways are important in breast carcinogenesis? Are some of the questions remain to be addressed ?
Lin, Jiun-Han. "EBV enhances tumorigenic activity in human breast cancer cells." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1707200714000600.
Full text"Somatostatin receptor 1, a novel EBV-associated CpG hypermethylated gene, contributes to the pathogenesis of EBV-associated gastric cancer." 2012. http://library.cuhk.edu.hk/record=b5549615.
Full text方法:本研究應用穩定轉染EBV的胃癌細胞AGS (AGS-EBV)和無EBV轉染的AGS細胞為模型。採用高解析度的甲基化DNA免疫共沉澱晶片技術(MeDIP-chip)比較AGS-EBV 和AGS全基因組DNA甲基化的變化,並根據基因本體論(GO),對EBV誘導的甲基化基因進行分類。採用RT-PCR,去甲基化處理及亞硫酸氫鈉測序(BGS)等方法驗證EBV誘導的甲基化基因。同時,採用基因敲除和過表達方法體外研究靶基因的生物學功能:通過細胞活力實驗和集落形成實驗判斷靶基因對細胞增殖的影響;通过流式细胞技术、伤口愈合实验及侵袭实验研究筛选到的靶基因生长抑素受体1(SSTR1)的功能;此外,还通過腫瘤通路基因PCR晶片分析靶基因調控的下游腫瘤相關基因。
结果:EBV編碼的小RNA(EBER)原位雜交方法和EBV潛伏期膜蛋白(LMP2A)的表達均證實AGS-EBV細胞中確實存在EBV的感染。和AGS細胞相比,發現AGS-EBV細胞中DNA甲基轉移酶3b(DNMT3b)的表達和活性顯著增加。AGS細胞中, LMP2A過表達後,DNMT3b的表達和活性也顯著增加。通過MeDIP-chip篩選出AGS-EBV中1,065甲基化有差異的基因,其中886基因為高甲基化。GO分析結果表明這些高甲基化基因參與KEGG信號通路。其中,六個新的高甲基化基因(MDGA2, IL15RA, SCARF2, EPHB6, SSTR1 和 REC8)在AGS-EBV細胞中的表達低於AGS;經過去甲基化處理之後,這些基因的表達水準有顯著增加。
通過深入研究生長抑素受體1(SSTR1)的生物學功能,發現:敲除SSTR1 能促進胃癌細胞的增殖和集落形成;通過调节G1/S期的調節因子,加快細胞進入S期,顯著增加S期的細胞數目。此外,胰腺癌細胞PANC1細胞中,SSTR1的過表達,也進一步證實SSTR1確實是一種腫瘤抑制基因。腫瘤通路基因PCR晶片結果顯示SSTR1通過促進細胞週期抑制因數(包括p15,p16,p21和p27)的表達,同時抑制CDC25A 和Myc的表達,發揮抑制增殖作用,導致細胞週期停滯在G1期,減少細胞增殖。SSTR1也通過減少凋亡相關基因的表達參與細胞凋亡的過程。此外,SSTR1還能顯著下調遷移相關基因的表達。這些結果表明,在EB病毒相關胃癌的發生過程中,SSTR1通過調節細胞週期、凋亡及遷移的有關基因,進而抑制細胞增殖,減少細胞的遷移和轉移。
结论:AGS感染EBV後,通過LMP2A促進DNMT3b的表達,激活DNMT3b的活性,導致886個腫瘤相關基因发生甲基化。SSTR1是一種EBV誘導的新的甲基化基因,在胃癌中具有抑制腫瘤的特性。研究表明, 由EBV誘導的SSTR1所具有的表觀遺傳學抑制作用參與EB病毒相關性胃癌的發病機制。
Background and Aims: Epstein-Barr virus (EBV)-associated gastric cancer (GC) accounts for about 10% of all GCs. Accumulating evidences revealed aberrant rmethylation of tumor suppressor genes in EBV-associated GCs. However, the effect of EBV infection on the genome-wide aberrant DNA methylation remains unclear. We aim to profile the genome-wide EBV-associated hypermethylation in EBV-infected cells, to identify EBV-associated methylated genes and to elucidate their function in gastric carcinogenesis.
Methods: The cell model of gastric cancer AGS cells with or without stable EBV infection was used in this study. Genome-wide DNA methylation profiles were compared between AGS-EBV and AGS cells by high resolution Methyl-DNA immunoprecipitation microarry (MeDIP-chip) assay. EBV-associated methylated genes were classified according to gene ontology (GO). The novel EBV-associated methylated candidates were validated using bisulfite genomic sequencing (BGS), RT-PCR, and demethylation treatment. Biological function of one of the candidate genes (Somatostatin Receptor 1, SSTR1) was studied in vitro using gene knockdown and over-expression approaches simultaneously. Effects of SSTR1 expression on gastric cancer cell was measured by cell viability assay, colony formation assay, flow cytometry, wound-healing assay and invasion assay. Gene modulation by SSTR1 in human cancer pathways was assessed by cancer pathway PCR array.
Results: EBV infection was confirmed by EBER in situ hybridization. LMP2A expression was detected in AGS-EBV cells but not in EBV negative AGS cells. Expression and activity of DNMT3b was found to be significantly increased in AGS-EBV cells compared to AGS cells. Ectopic expression of LMP2A in AGS enhanced the expression and activity of DNMT3b. MeDIP-chip profiling identified a total of 1,065 genes differentially methylated by EBV infection (fold changes ≥2, P < 0.05) (fold-changes 2.4365.2). Gene ontology analysis indicated the enrichment of hypermethylated genes involving in important KEGG pathways. Notably, in addition to higher methylation levels confirmed by BGS, six novel hypermethylated genes (MDGA2, IL15RA, SCARF2, EPHB6, SSTR1 and REC8) were down-regulated in AGS-EBV cells as compared with AGS cells. Furthermore, demethylation treatment increased transcription levels of the six genes in AGS-EBV cells.
The biological function of SSTR1 gene was further investigated. Knockdown of SSTR1 in GC cells increased cell proliferation (P < 0.05) and colony formation ability (P < 0.01), and markedly increased cells in S phase through regulating G1/S phase mediators. Overexpression of SSTR1 in PANC1 cell line further confirmed that SSTR1 indeed was a tumor suppressor gene. Analysis of SSTR1 regulation of cancer pathway demonstrated that SSTR1 exerted antiproliferative effect by inducing cyclin-dependent inhibitors (p15, p16, p21 and p27) and inhibiting cell divison cycle 25 homolog A (CDC25A) and Myc, resulting in cell cycle arrest in G1 phase and reduction of cell proliferation. SSTR1 also took part in proliferation by decreasing expression of apoptosis regulators. Moreover, SSTR1 significantly downregulated the expression of migration-related genes, including ITGA1, ITGA2, ITGA3, ITGB5, IL8, MMP1 and PLAUR. These findings suggest that SSTR1 inhibits proliferation and reduces cell migration/invasion in gastric cancer by deregulating genes invloved in the regulation of cell cycle, survival/apoptosis and migration.
Conclusions: EBV infection in AGS cells induces genome-wide aberrant hypermethylation of 886 genes which involved in important cancer-related pathways. EBV-associated methylation is mediated by activation of DNMT3b through LMP2A. We identified and functionally characterized a novel EBV-associated methylated gene SSTR1 which exerted anti-tumor properties in GC. Epigenetic silencing of SSTR1 associated with EBV infection contributes to the pathogenesis of EBV-associated GC.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Zhao, Junhong.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2012.
Includes bibliographical references (leaves 129-141).
Abstract also in Chinese.
ABSTRACT --- p.i
摘 要 --- p.iv
Acknowledgements --- p.vi
Publications --- p.vii
Research articles --- p.vii
Conference abstracts --- p.viii
Table of contents --- p.x
list of tables --- p.xiii
list of figures --- p.xiv
list of abbreviations --- p.xvi
Chapter Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- General introduction --- p.1
Chapter 1.2 --- Gastric Cancer --- p.3
Chapter 1.2.1 --- Eipdemiology of Gastric Cancer --- p.4
Chapter 1.2.2 --- Pathology of Gastric Cancer --- p.8
Chapter 1.2.3 --- Risk Factors for Gastric Cancers --- p.11
Chapter 1.3 --- Epstein-Barr Virus-associated Gastric Cancer (EBVaGC) --- p.15
Chapter 1.3.1 --- Historical Discovery and Harm of EBV --- p.15
Chapter 1.3.2 --- Molecular Biology of EBV --- p.16
Chapter 1.3.3 --- Latent and Lytic Infection of EBV --- p.18
Chapter 1.3.4 --- EBV Products --- p.18
Chapter 1.3.5 --- EBV-associated gastric cancer (EBVaGC) --- p.28
Chapter 1.4 --- EBV-induced Epigenetic Alteration in Gastric Carcinogenesis --- p.36
Chapter 1.4.1 --- Cytosine Methylation and CpG Island --- p.36
Chapter 1.4.2 --- DNA Methylation in Gastric Cancer --- p.39
Chapter 1.5 --- How to identify EBV-induced promoter methylation in gastric cancer --- p.45
Chapter 1.5.1 --- Methylated DNA Immunoprecipitation (MeDIP) --- p.48
Chapter 1.5.2 --- Combined Bisulfite Restriction Analysis (COBRA) --- p.49
Chapter 1.5.3 --- Bisulfite Genomic Sequencing --- p.49
Chapter 1.5.4 --- Pyrosequencing --- p.49
Chapter Chapter 2 --- Materials and Methods --- p.51
Chapter 2.1 --- Materials --- p.51
Chapter 2.1.1 --- Cancer Cell Lines and Culture Condition --- p.51
Chapter 2.1.2 --- Primary GC Samples --- p.52
Chapter 2.2 --- EBV Encoded Nuclear RNA (EBER) in situ Hybridization (EBER-ISH) --- p.52
Chapter 2.3 --- Western Blot Analysis --- p.53
Chapter 2.4 --- Plasmid and Transfection --- p.56
Chapter 2.4.1 --- Plasmid Construction and Extraction --- p.56
Chapter 2.4.2 --- Plasmid Transfection --- p.59
Chapter 2.5 --- Gene Expression Analysis --- p.59
Chapter 2.5.1 --- Purification of Total RNA (RNeasy Kit, Qiagen) --- p.59
Chapter 2.5.2 --- cDNA Reverse Transcription --- p.60
Chapter 2.5.3 --- Semi-Quantitative PCR --- p.62
Chapter 2.5.4 --- Quantitative Real-Time PCR (qRT-PCR) --- p.64
Chapter 2.6 --- DNMT1 and 3b Activity Assay --- p.64
Chapter 2.7 --- DNA Methylation Analysis --- p.64
Chapter 2.7.1 --- Genomic DNA Extraction --- p.64
Chapter 2.7.2 --- Genome-wide Profiling of EBV-associated DNA Methylation by MeDIP-chip --- p.65
Chapter 2.7.3 --- Bioinformatics Analysis --- p.66
Chapter 2.7.4 --- CpG Island Prediction and Analysis of the Targets’ Promoter Region --- p.66
Chapter 2.7.5 --- DNA Sodium Bisulfite Modification --- p.67
Chapter 2.7.6 --- Target Gene Methylation in GC Cell Lines --- p.67
Chapter 2.7.7 --- Bisulfite Pyrosequencing Analysis in GC Tissue Samples --- p.70
Chapter 2.8 --- Biological Function Analysis of SSTR1 --- p.72
Chapter 2.8.1 --- Cell Proliferation Assay for Stable Transfection --- p.72
Chapter 2.8.2 --- Colony Formation Assay --- p.72
Chapter 2.8.3 --- Cell Cycle Analysis Assay --- p.72
Chapter 2.8.4 --- Cell Migration Analysis --- p.73
Chapter 2.8.5 --- Invasion Analysis --- p.73
Chapter 2.8.6 --- Human Cancer Pathway Finder RT2 Profiler PCR Array Analysis --- p.74
Chapter 2.9 --- Statistical Analysis --- p.76
Chapter Charpter 3 --- results --- p.77
Chapter 3.1 --- EBV Infection in AGS-EBV Cell Model --- p.77
Chapter 3.2 --- Activation of DNMT3b in AGS-EBV Cells --- p.80
Chapter 3.3 --- LMP2A Induced DNMT3b Activity in AGS Cells --- p.82
Chapter 3.4 --- Genome-wide Profiling of DNA Methylation Associated with EBV Infection Using MeDIP-chip --- p.84
Chapter 3.5 --- EBV-associated Cancer Pathways Defined by EBV-associated Promoter Methylated Genes --- p.86
Chapter 3.6 --- CpG Hypermethylation and Transcriptional Silencing of EBV-associated Methylated Genes in AGS-EBV Cells --- p.88
Chapter 3.7 --- Bioinformatics Analysis of SSTR1 Using University of California Santa Cruz Genome Bioinformatics (UCSC) Database and CpG Island Searcher --- p.93
Chapter 3.8 --- COBRA Analysis of SSTR1 Promoter Methylation in GC Cell Lines --- p.93
Chapter 3.9 --- Frequent SSTR1 Hypermethylation was Associated with EBV Positive Primary Gastric Cancer --- p.96
Chapter 3.10 --- SSTR1 was Down-regulated in GC Cell Lines through RNA Interference --- p.103
Chapter 3.11 --- SSTR1 Knockdown Induced Cell Proliferation in GC Cell Lines --- p.105
Chapter 3.12 --- SSTR1 Knock-down Promoted Cells to Enter into S Phase --- p.108
Chapter 3.13 --- SSTR1 Knock-down Increased the Migration Ability of GC --- p.110
Chapter 3.14 --- SSTR1 Knock-down Promoted Cell Invasion --- p.112
Chapter 3.15 --- Ectopic Expression of SSTR1 Inhibited Proliferation and Clonogenicity in PANC1 Cancer Cells --- p.114
Chapter 3.16 --- Identification of Genes Modulated by SSTR1 --- p.116
Chapter Chapter 4 --- Discussion --- p.119
Chapter Chapter 5 --- Limitation of the study --- p.127
ConclusionS --- p.128
Reference --- p.129
Chen, Yi-Wei, and 陳奕瑋. "Si Hierarchical Nanostructures for Capturing Nasopharyngeal Cancer Circulating Tumor Cells and Detecting EBV DNA." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/59z2e3.
Full text國立中央大學
材料科學與工程研究所
105
Studying circulating tumor cells (CTCs) helps us understand the biology of metastasis. Monitoring CTCs counts in patients’ blood can also help us know if the treatment works or not. Most cancer patients were died because of distant metastases instead of primary tumor. Thus, early detection of CTCs could provide early diagnosis of metastases and even personalized therapy. Herein, we introduced a new CTC capturing substrate composed of Si hierarchical nanostructures (Pyramid NW) method to capture nasopharyngeal carcinoma (NPC) cell in vitro. According to the results, the pyramid microstructure increased the surface area because of its geometric shape. The amount of antibodies on the substrate also increase, enhancing the cell-binding ability of the substrate. The nanowire (NW) structure improved the cell adhesion by letting the cytoskeleton of the cells extend into the gaps between the NW, making pyramid NW structure an ideal substrate for CTC capture. The Epstein-Barr virus (EBV) DNA titers in NPC patient’ blood is usually higher than normal people. In recent years, Surface enhanced Raman scattering (SERS) has become an efficient technique for detecting DNA because of its single molecule level sensitivity and molecular specificity. In this study, our pyramid NW substrate can easily be transformed into a SERS substrate by dipping it into AgNO3 solution. The DNA detection limit can reach up to 10-13M and the calculated enhancement factor can achieve up to 107.
Assunção, Bibiana Andreia Moreira. "Importância da Infeção pelo Epstein Barr (EBV) no cancro oral : revisão narrativa." Master's thesis, 2021. http://hdl.handle.net/10451/51621.
Full textO cancro oral é um problema de saúde pública, tanto nos países desenvolvidos como nos que estão em desenvolvimento e constitui uma importante causa de doença e morte. O vírus Epstein-Barr (EBV) apresenta um tropismo por linfócitos B e também por células epiteliais. Embora a infeção geralmente seja benigna, parece estar associada a vários linfomas e carcinomas que surgem na cavidade oral e em outros locais anatómicos. Nos últimos anos, tem sido investigada a relação com a carcinogénese oral, devido ao seu potencial oncogénico. Este trabalho teve como principal objetivo a realização de uma pesquisa sobre o papel da infeção pelo EBV na carcinogénese oral. Visou-se ainda tentar contribuir com informação que auxilie o médico a compreender a importância desta infeção no cancro oral. Foi realizada uma pesquisa através da base de dados da PubMed®, de artigos publicados nos últimos 10 anos, utilizando os termos MeSH: “Epstein-Barr Virus Infections” e “Mouth Neoplasms”. Os artigos a incluir foram selecionados com base no título e relevância do seu resumo. Na totalidade foram incluídos 29 artigos. A presença de EBV é comum em tecidos da cavidade oral. A prevalência de EBV em amostras orais varia amplamente entre os estudos. A positividade para a presença do EBV em carcinomas orais apresenta uma variação de estudo para estudo, numa proporção entre 30% e 90%. A infeção por EBV e o risco de cancro oral foi consistentemente e positivamente relatado. Investigadores acreditam que, o EBV provavelmente confere fenótipos malignos observados em casos tumorais positivos para EBV. A cavidade oral serve como o principal local de residência e transmissão do EBV. No entanto, outros estudos com amostras maiores são cruciais para confirmar o papel do EBV na patogénese do cancro oral.
Oral cancer is a public health problem in both developed and developing countries and is a major cause of illness and death. EBV has a tropism for B lymphocytes and also for epithelial cells. Although the infection is usually benign, it appears to be associated with a number of lymphomas and carcinomas that arise in the oral cavity and other anatomical sites. In recent years, the relationship with oral carcinogenesis has been investigated, due to its oncogenic potential. The main objective of this work was to carry out a research on the role of EBV infection in oral carcinogenesis. It was also intended to try to contribute with information to help the physician to understand the importance of this infection in oral cancer. A search was carried out through the PubMed® database, of articles published in the last 10 years, using the MeSH terms: “Epstein-Barr Virus Infections” and “Mouth Neoplasms”. The articles to include were selected based on the title and relevance of their abstract. 29 articles were included. The presence of EBV is common in tissues of the oral cavity. The prevalence of EBV in oral samples varies widely between studies. The positivity for the presence of EBV in oral carcinomas varies from study to study, in a proportion between 30% and 90%. EBV infection and the risk of oral cancer were consistently and positively reported. Investigators believe that EBV likely confers malignant phenotypes seen in EBV-positive tumor cases. The oral cavity serves as the main place of residence and transmission of EBV. However, other studies with larger samples are crucial to confirm the role of EBV in the pathogenesis of oral cancer.
"Deregulated NF-κB signalling pathways in EBV-positive nasopharyngeal carcinoma." 2011. http://library.cuhk.edu.hk/record=b5894717.
Full textThesis (M.D.)--Chinese University of Hong Kong, 2011.
Includes bibliographical references (leaves 136-170).
Abstracts in English and Chinese.
Abstract --- p.i
Acknowledgements --- p.v
Table of Contents --- p.vi
List of Figures --- p.x
List of Tables --- p.xiii
List of Publications --- p.xv
Chapter Chapter 1 --- Introduction --- p.1
Chapter 1.1. --- Aims of Study --- p.1
Chapter 1.2. --- Literature Review --- p.2
Chapter 1.2.1. --- Nasopharyngeal Carcinoma --- p.2
Chapter 1.2.1.1. --- Overview --- p.2
Chapter 1.2.1.2. --- Histopathology --- p.2
Chapter 1.2.1.3. --- Epidemiology --- p.3
Chapter 1.2.1.4. --- Etiology --- p.5
Chapter 1.2.1.4.1. --- Epstein-Barr Virus (EBV) Latent Infection --- p.5
Chapter 1.2.1.4.2. --- Environmental Factors --- p.5
Chapter 1.2.1.4.3. --- Genetic Factors --- p.6
Chapter 1.2.1.5. --- Molecular Pathogenesis --- p.7
Chapter 1.2.1.5.1. --- Chromosomal Alterations --- p.7
Chapter 1.2.1.5.2. --- NPC-associated Tumour Suppressor Genes --- p.7
Chapter 1.2.1.5.3. --- NPC-associated Oncogenes --- p.8
Chapter 1.2.2. --- Epstein-Barr Virus --- p.9
Chapter 1.2.2.1. --- Overview --- p.9
Chapter 1.2.2.2. --- Lytic and Latent Infection of EBV --- p.9
Chapter 1.2.2.3. --- EBV Latency Programs and Associated --- p.10
Malignancies --- p.11
Chapter 1.2.2.4. --- The Role of EBV in NPC --- p.12
Chapter 1.2.3. --- NF-kB Signalling Pathways --- p.12
Chapter 1.2.3.1. --- Overview --- p.12
Chapter 1.2.3.2. --- Pathway Components --- p.12
Chapter 1.2.3.2.1. --- NF-kB Subunits --- p.16
Chapter 1.2.3.2.2. --- Inhibitors of kB (IkBs) --- p.16
Chapter 1.2.3.2.3. --- IkB Kinases (IKKs) --- p.17
Chapter 1.2.3.3. --- NF-kB Activation and Signalling --- p.17
Chapter 1.2.3.3.1. --- The Canonical Pathway --- p.18
Chapter 1.2.3.3.2. --- The Non-canonical Pathway --- p.18
Chapter 1.2.3.3.3. --- Physiological Functions of NF-kB --- p.19
Chapter 1.2.3.4. --- NF-kB Signalling and Tumourigenesis --- p.20
Chapter 1.2.3.4.1. --- Oncogenic Activation of NF-kB in Hematological Malignancies --- p.20
Chapter 1.2.3.4.2. --- Oncogenic Activation of NF-kB in Solid and Epithelial Tumours --- p.22
Chapter Chapter 2 --- Material and Methods --- p.22
Chapter 2.1. --- Tumour Specimens --- p.24
Chapter 2.2. --- NPC Tumour Lines and Immortalized NP Cell Lines --- p.24
Chapter 2.2.1. --- Cell Lines --- p.24
Chapter 2.2.2. --- Xenografts --- p.27
Chapter 2.3. --- DNA Sequence Analysis --- p.27
Chapter 2.3.1. --- Genomic DNA Extraction --- p.27
Chapter 2.3.2. --- Polymerase Chain Reaction (PCR) --- p.28
Chapter 2.3.3. --- DNA Sequencing --- p.32
Chapter 2.4. --- RNA Expression Analysis --- p.32
Chapter 2.4.1. --- Total RNA Extraction and Reverse Transcription --- p.33
Chapter 2.4.2. --- Quantitative Real-time Polymerase Chain Reaction (QRT-PCR) --- p.35
Chapter 2.5. --- Protein Expression Analysis --- p.35
Chapter 2.5.1. --- Total Protein Extraction --- p.35
Chapter 2.5.2. --- Nuclear and Cytoplasmic Protein Isolation --- p.36
Chapter 2.5.3. --- Western Blotting --- p.39
Chapter 2.6. --- Immunohistochemical Staining --- p.41
Chapter 2.7. --- Statistical Analysis --- p.41
Chapter 2.8. --- Immunoprecipitation --- p.43
Chapter 2.9. --- Electrophoretic Mobility Shift Assay (EMSA) and Supershift Assay --- p.44
Chapter 2.10. --- Enzyme-Linked Immunosorbent Assay (ELISA) --- p.45
Chapter 2.11. --- Plasmid Preparation --- p.45
Chapter 2.11.1. --- Plasmids --- p.45
Chapter 2.11.2. --- Bacterial Transformation and Plasmid DNA Extraction --- p.46
Chapter 2.12. --- Transfections --- p.46
Chapter 2.12.1. --- Transient Transfection --- p.46
Chapter 2.12.2. --- Stable Transfection --- p.47
Chapter 2.13. --- Immunofluorescence --- p.47
Chapter 2.14. --- Cell Proliferation and Viability Analysis --- p.47
Chapter 2.15. --- Small Interfering RNA (siRNA) Knockdown --- p.49
Chapter 2.16. --- Expression Microarray --- p.49
Chapter 2.16.1. --- Agilent Oligonucleotide Microarray --- p.50
Chapter 2.16.2. --- Data Analysis --- p.51
Chapter Chapter 3 --- Activation of NF-kB Signals in NPC --- p.51
Chapter 3.1. --- Introduction --- p.52
Chapter 3.2. --- Results --- p.52
Chapter 3.2.1. --- Expression Pattern of NF-kB Subunits in NPC Tumour Lines --- p.55
Chapter 3.2.2. --- Distinct NF-kB Complexes in NPC Tumour Lines --- p.60
Chapter 3.2.3. --- Expression of NF-kB Subunits in NPC Primary Tumours --- p.67
Chapter 3.3. --- Discussion
Chapter Chapter 4 --- Alterations of NF-kB Components in NPC --- p.71
Chapter 4.1. --- Introduction --- p.72
Chapter 4.2. --- Results --- p.72
Chapter 4.2.1. --- Homozygous Deletion of IicBa and TRAF3 in NPC Tumour Lines --- p.76
Chapter 4.2.2. --- Mutation of TRAF2 and A20 in NPC Tumour Lines
Chapter 4.2.3. --- Aberrant Expression of Multiple NF-kB Signalling Components in NPC Tumour Lines --- p.80
Chapter 4.2.4. --- Expression of NF-kB Signalling Components in NPC --- p.85
Primary Tumour --- p.92
Chapter 4.3. --- Discussion --- p.99
Chapter Chapter 5 --- Identification of Downstream Targets for NPC-associated NF-kB Signalling --- p.99
Chapter 0.1. --- Introduction --- p.99
Chapter 0.2. --- Results --- p.100
Chapter 0.2.1. --- Target Genes Modulated by p50 --- p.100
Chapter 0.2.2. --- Functional Annotation of p50 Target Genes --- p.105
Chapter 0.2.3. --- Target Genes Modulated by RelB --- p.105
Chapter 0.2.4. --- Functional Annotation of RelB Target Genes --- p.105
Chapter 0.2.5. --- Functional Annotation of Genes Modulated by both p50 and RelB --- p.111
Chapter 0.3. --- Discussion --- p.118
Chapter Chapter 6 --- Functional Role of TRAF3 Inactivation in NPC --- p.118
Chapter 0.1. --- Introduction --- p.118
Chapter 0.2. --- Results --- p.118
Chapter 0.2.1. --- Effect of TRAF3 Restoration on NF-kB Activity --- p.119
Chapter 0.2.2. --- Effect of TRAF3 Expression on Cell Proliferation --- p.123
Chapter 0.2.3. --- TRAF3 Expression Modulates Interferon Transcription in NPC Cells --- p.128
Chapter 0.3. --- Discussion
Chapter Chapter 7 --- General Discussion --- p.132
Chapter Chapter 8 --- Conclusion
Chapter Chapter 9 --- References
Appendix --- p.136