Chapter 18 : Ontogeny of the Host Response to Enteric Microbial Infection

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Normal newborn animals, including humans, do not have the discriminatory function of the fully mature form; as a result, they are more likely to have abnormal responses to food and commensal organisms. The development of this important function is intimately associated with changes in the intestinal immune system that occur during ontogeny in response to intrinsic genetic programs, exposure to food antigens, and colonization by a normal commensal flora. This chapter reviews what these changes are, when they take place, what mechanisms drive them, and how they contribute to the function of the mature response to enteric microbes, and also briefly describes the elements of the mature intestinal immune system. In the context of defense against microbial infection, an important function of intestinal epithelial cells is to act as a physical barrier. During gut ontogeny, lymphocyte populations develop in the human fetal intestine from about 11 weeks of gestation onward. The major changes after this period occur in the epithelial and lymphocyte populations. Antibiotic use in the neonatal period and infancy, which has significant effects on the intestinal flora and therefore on the maturation of the intestinal immune system, has also been associated with the subsequent development of allergic disease. Further study of the role of commensal-host interactions in guiding the maturation of intestinal immune function will provide added insight, not only into the responses that protect against enteric infections, but also into more general mechanisms involved in immunoregulation.

Citation: Cherayil B, Walker W. 2003. Ontogeny of the Host Response to Enteric Microbial Infection, p 301-332. In Hecht G (ed), Microbial Pathogenesis and the Intestinal Epithelial Cell. ASM Press, Washington, DC. doi: 10.1128/9781555817848.ch18

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Adaptive Immune System
Innate Immune System
Immune Systems
Major Histocompatibility Complex
Major Histocompatibility Complex Class I
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Image of FIGURE 1

Elements of the mucosal immune system. The various cellular components that contribute to immune defense of the intestine are depicted.

Citation: Cherayil B, Walker W. 2003. Ontogeny of the Host Response to Enteric Microbial Infection, p 301-332. In Hecht G (ed), Microbial Pathogenesis and the Intestinal Epithelial Cell. ASM Press, Washington, DC. doi: 10.1128/9781555817848.ch18
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Image of FIGURE 2

Changes in the mucosal immune system during ontogeny. The appearance of various cell types, molecules, and functional changes associated with immune defense of the intestine are depicted along a time line representing the fetal and early neonatal periods. The numbers refer to weeks of gestation.

Citation: Cherayil B, Walker W. 2003. Ontogeny of the Host Response to Enteric Microbial Infection, p 301-332. In Hecht G (ed), Microbial Pathogenesis and the Intestinal Epithelial Cell. ASM Press, Washington, DC. doi: 10.1128/9781555817848.ch18
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