The abnormal function of T cells in chronically anti-mu-treated mice with no mature B lymphocytes.
T cells from anti-mu-treated mice, normal goat serum ( NGS )-treated mice or untreated control mice were compared with respect to their surface antigenic phenotypes, T cell mitogenic responses, helper function and precursor frequency of helper T cells. Anti-mu treatment arrested the development of B cells at an immature stage, as determined by flow microfluorometry; it resulted in no serum IgM, but detectable levels of IgG by solid-phase radioimmunoassay. Proliferative responses to phytohemagglutinin and concanavalin A were significantly decreased in T cells obtained from mu-suppressed C57BL/6 mice, but not from control mice. When T cells from anti-mu-treated mice were tested in vitro for their helper activity to collaborate with B cells from nu/nu C57BL/6 mice to give plaque-forming cells to sheep red blood cells, they provided far less help than did T cells from control mice. The frequency of T helper cells, as measured by limiting dilution analysis, was much lower in the anti-mu- than in the NGS -treated mice. Cell mixing experiments provided evidence for active suppression of T helper function among splenocytes taken from mu-suppressed mice.
D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000494:pharmacology; D005434:Flow Cytometry; D006041:Goats; D007108:Immune Tolerance; D007143:Immunoglobulin Heavy Chains / Q000276:immunology*; D007148:Immunoglobulin mu-Chains / Q000276:immunology*; D008213:Lymphocyte Activation; D051379:Mice; D008810:Mice, Inbred C57BL; D008819:Mice, Nude; D011863:Radioimmunoassay / Q000379:methods; D013601:T-Lymphocytes / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000166:cytology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
D000888:Antibodies, Anti-Idiotypic; D007143:Immunoglobulin Heavy Chains; D007148:Immunoglobulin mu-Chains