title: Chronic in vivo depletion of CD4 T cells begun in utero inhibits gut B cell differentiation.
abstract: We studied the role of CD4 T cells on the ontogeny of mucosal IgA compartment. We treated C57 BL/6 mice, beginning in utero and for 4 weeks thereafter, with anti-CD4 monoclonal antibody. Mice were evaluated at 1, 3, and 5 weeks after stopping the treatment. At 1 week, anti-CD4-treated mice had no detectable CD4 T cells in spleen or Peyer's patches. These CD4-depleted mice demonstrated a 40% reduction of surface Peyer's patch IgA+ B cells and a marked decrease in jejunal IgA secretion. By 5 weeks, CD4 T cells were detectable in spleen and Peyer's patch and the number of surface IgA+ B cells in Peyer's patch was increased, but they remained less than the control levels. Jejunal IgA secretion recovered to the control level by 5 weeks. LPS induced normal levels of in vitro IgM secretion by Peyer's patch B cells in anti-CD4-treated mice; thus, treatment with anti-CD4 does not nonspecifically inhibit the gut B cell compartment. This study demonstrates that CD4 T cell depletion begun in utero significantly inhibits the differentiation of mucosal B cells to IgA-secreting cells and partially inhibits switching to IgA+ B cells in Peyer's patch.
authors.affiliation: Department of Pediatrics, University of Iowa College of Medicine, Iowa City 52242.
authors.forename: N
authors.initials: N
authors.lastname: Tolaymat
authors.forename: S P
authors.initials: SP
authors.lastname: Weber
authors.forename: J S
authors.initials: JS
authors.lastname: Cowdery
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D001402:B-Lymphocytes / Q000166:cytology*; D015496:CD4-Positive T-Lymphocytes / Q000502:physiology*; D002454:Cell Differentiation / Q000502:physiology; D007070:Immunoglobulin A / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D007413:Intestinal Mucosa / Q000196:embryology / Q000276:immunology*; D008212:Lymphocyte Depletion; D051379:Mice; D008810:Mice, Inbred C57BL; D010581:Peyer's Patches / Q000166:cytology; D013154:Spleen / Q000166:cytology
chemical_list: D000911:Antibodies, Monoclonal; D007070:Immunoglobulin A; D007075:Immunoglobulin M