Document 0590 DOCN M9650590 TI Intestinal T lymphocytes. DT 9605 AU Robijn RJ; Logtenberg T; Wiegman LJ; van Berge Henegouwen GP; Houwen RW; Koningsberger JC; Dept. of Gastroenterology, Immunology, University Hospital; Utrecht, The Netherlands. SO Scand J Gastroenterol Suppl. 1995;212:23-33. Unique Identifier : AIDSLINE MED/96117908 AB The intestine is largely colonized by bacteria and further exposed to an immense array of ingested and shed immunogenic material. Therefore, the gut associated lymphoid tissue plays a major role in the human immune system. It may even constitute a unique immune system of its own, since it has been demonstrated to differ anatomically, phenotypically, functionally and on a molecular basis from its systemic counterpart and other peripheral lymphoid tissue. This is ultimately reflected by the observation in (transgenic) mice that intraepithelial T cells can develop independently of the thymus. Along the same lines, a rapidly growing body of evidences suggests that human bone marrow precursors can home to the gut epithelium, rearrange their T cell receptor genes and further differentiate in the mucosal micro environment. This, and other features that characterize the 'diffuse' mucosal T cell infiltrate will be discussed. DE Animal CD4-Positive T-Lymphocytes/IMMUNOLOGY/METABOLISM/PHYSIOLOGY CD8-Positive T-Lymphocytes/IMMUNOLOGY/METABOLISM/PHYSIOLOGY Gene Rearrangement, T-Lymphocyte Human Intestinal Mucosa/*IMMUNOLOGY/METABOLISM/PHYSIOLOGY Mice Mice, Transgenic Receptors, Antigen, T-Cell Support, Non-U.S. Gov't T-Lymphocyte Subsets *T-Lymphocytes/IMMUNOLOGY/METABOLISM/PHYSIOLOGY JOURNAL ARTICLE REVIEW REVIEW, ACADEMIC SOURCE: National Library of Medicine. NOTICE: This material may be protected by Copyright Law (Title 17, U.S.Code).