T Cell Initiated Gastric Pathology

超出所提供的空间。幽门螺杆菌是一种主要的病原体，除了感染世界上一半以上的人口外，它还与胃和十二指肠溃疡疾病、粘膜相关淋巴瘤和腺癌有关。幽门螺杆菌感染导致嗜中性粒细胞、巨噬细胞、CD4+ T细胞和B细胞早期胃浸润。这些胃浸润伴随着胃IFN-y、TNF- 0_和IL-1水平的升高，胃壁细胞、产酶细胞的丧失和胃粘膜细胞的不典型增生。关于这种胃浸润诱导随后的胃上皮病理的机制知之甚少。幽门螺杆菌感染的一种小动物模型——狐猴小鼠模型，在感染后发生严重的胃萎缩和胃腺癌，与人类疾病非常相似。该模型允许对幽门螺杆菌感染的适应性免疫反应进行仔细的分析。使用一种新的过继性疾病转移模型，我们已经证明宿主CD4+ T细胞反应对H. felis相关胃病理的发展至关重要。这引起了我们对CD4+ T细胞在幽门螺杆菌相关的胃上皮细胞破坏和病理发展中的作用及其潜在效应机制的关注。本资助申请的重点是胃中CD4+ T细胞的募集和激活导致继发性非抗原特异性胃上皮细胞改变的假设。这些上皮细胞增殖和分化的变化导致胃发育不良和胃癌的形成。为了阐明这种免疫/上皮细胞关系及其后遗症，我们建议：1)表征CD4+ T细胞对幽门螺杆菌相关胃病理发展至关重要的抗原识别需求；2)确定分泌或细胞表面产物在幽门螺杆菌相关胃上皮病理产生中的作用。这些研究将利用疾病的体内模型，以及一种新的原代胃上皮细胞培养系统。了解宿主对幽门螺杆菌的免疫反应诱导胃上皮病理的基本机制，将为进一步研究幽门螺杆菌感染及相关消化系统疾病的炎症反应调控和免疫疗法设计奠定基础。莫63110年关键人员 ======================================== 节结束 ===========================================

EXCEED THE SPACE PROVIDED. The bacteria Helicobacter pylori is a major pathogen which, in addition to infecting over half of the world's population, is linked to gastric and duodenal ulcer disease, mucosal-associated lymphomas, and adenocarcinoma. Infection with H. pylori results in an early gastric infiltration of neutrophils, macrophages, CD4+ T cells, and B cells. These gastric infiltrates are accompanied by increased levels of gastric IFN-y, TNF- 0_,and IL-1 and by loss of gastric parietal cells, zymogenic cells, and dysplasia of gastric mucosal cells. Very little is known about the mechanisms by which this gastric infiltrate induces subsequent gastric epithelial pathology. A small animal model of Helicobacter infection, the H. felis mouse model, closely mimics the human disease in that severe gastric atrophy and gastric adenocarcinoma develops after infection. This model has allowed a careful analysis of the adaptive immune response to Helicobacter infection. Using a novel adoptive transfer model of disease, we have shown that it is the host CD4+ T cell response which is crucial for the development of H. felis-associated gastric pathology. This has directed our attention to the role of the CD4+ T cell, and its potential effector mechanisms, in the development of Helicobacter-associated gastric epithelial cell destruction and pathology. This grant application focuses on the hypothesis that recruitment and activation of CD4+ T cells in the stomach results in secondary non-antigen specific gastric epithelial cell alterations. These changes in epithelial cell proliferation and differentiation lead to gastric dysplasia and cancer formation. In order to elucidate this immune / epithelial cell relationship and its sequelae, we propose to: 1) characterize the antigen recognition requirements of the CD4+ T cell critical for the development of Helicobacter-associated gastric pathology; and 2) determine the role of secreted or cell-surface products in the generation of Helicobacter-associated gastric epithelial pathology. These studies will utilize both in vivo models of disease, as well as a novel primary gastric epithelial cell cul_tre system. The understanding of the basic mechanisms by which the host immune response to Helicobacter induces gastric epithelial pathology will lay the foundation for further studies on the regulation of the inflammatory response and the design of immunotherapies for Helicobacter infection and associated digestive diseases _ERFORMANCE SITE(S) (organization, city, state) Washington University 660 South Euclid Avenue St. Louis, MO 63110 KEY PERSONNEL ========================================Section End===========================================