Intestinal Mucosal Immune and Functional Response to Gastric and Enteric Pathogen

肠上皮是宿主内环境和宿主细胞之间最大的粘膜屏障。 外部环境在生理条件下，抗原运输通过三种非相互作用的方式发生。 专有途径：肠内跨细胞、细胞旁和树突状细胞取样 流明当受控抗原运输和宿主免疫应答之间的微妙平衡丧失时， 可能会出现严重的炎症和明显的临床症状。这一负面结果可能受到以下因素的影响： 宿主的遗传组成、肠道病原体的毒力特征或两者的组合。的结果 宿主和肠道微生物之间的相互作用受到以下事实的影响： 上皮细胞是非常动态的，对无数种类的刺激有灵敏的反应， 由微生物伴侣组成的复杂的顶极群落组成，数量远远超过 肠本身。在正常的体内平衡中，胃肠道上皮层形成一个紧密的，但选择性的屏障： 微生物和大多数抗原都被拒之门外，但从必需到微不足道的营养物质都被吸收了。 有效地此外，上皮屏障的紧密性本身是动态的，并依赖于紧密连接 (TJ)能力，虽然管理和影响其渗透性的机制知之甚少。 越来越清楚的是，上皮通透性的缺陷与大的 一些局部甚至全身性疾病。肠道感染的一个共同特征是它们能够 增加上皮渗透性，这是一种启动和促进宿主免疫应答的作用。粘膜 渗透性也是粘膜引入的疫苗递送中的一个因素。通过这个项目，我们打算 利用我们在粘膜生物学、蛋白质组学、基因组学、微生物组学、生物化学 和分子生物学，以确定宿主-微生物系统中粘膜屏障功能改变的作用。 影响抗原运输的相互作用，导致局部和全身免疫应答， 和肠道病原体。我们将充分利用一个非常有利的环境，包括 粘液瘤生物学研究中心、疫苗开发中心和基因组研究所 科学，所有主题都与这个提议有关。

The intestinal epithelium presents the largest mucosal barrier between the internal host milieu and the external environment. Under physiological circumstances antigen trafficking occurs through three nonmutually exclusive pathways: transcellular, paracellular, and dendritic cell sampling within the intestinal lumen. When the delicate balance between controlled antigen trafficking and host immune response is lost, severe inflammation and overt clinical symptoms may develop. This negative outcome may be influenced by host genetic makeup, virulence traits of the intestinal pathogens, or the combination of both. The outcome of the interplay between host and intestinal microorganisms is influenced by the fact that the intestinal epithelium is extremely dynamic and exquisitely responsive to stimuli of innumerable variety and it is populated by a complex climax community of microbial partners, far more numerous than the cells of the intestine itself. In normal homeostasis, the gastrointestinal epithelial layer forms a tight, but selective barrier: microbes and most antigens are held at bay, but nutrients from the essential to the trivial are absorbed efficiently. Moreover, the tightness of the epithelial barrier is itself dynamic and depends on tight junctions (TJ) competency, though the mechanisms governing and affecting their permeability are poorly understood. What is becoming increasingly clear is that defects in epithelial permeability are associated with a large number of local and even systemic disorders. A common feature of enteric infections is their ability to increase epithelial permeability, an effect that initiates and promotes the host immune response. Mucosal permeability is also a factor in the delivery of mucosally introduced vaccines. With this project, we intend to capitalize on our combined expertise in mucosal biology, proteomics, genomics, microbiomics, biochemistry, and molecular biology to determine the role of alterations in mucosal barrier function in host-microbial interactions affecting antigen trafficking that lead to local and systemic immune responses to gastric and enteric pathogens. We will take full advantage of a very conducive environment that includes the Mucosal Biology Research Center, the Center for Vaccine Development and The Institute of Genomic Science, all thematically relevant to this proposal.