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Regulation of immunoglobulin a secretion in polyclonally induced in vitro human lymphocyte cultures the function of t and b cells from mesenteric lymph nodes and peripheral blood

, : Regulation of immunoglobulin a secretion in polyclonally induced in vitro human lymphocyte cultures the function of t and b cells from mesenteric lymph nodes and peripheral blood. Clinical & Experimental Immunology 64(1): 158-165

Human gut-associated immunoregulatory events were studied in a pokeweed mitogen (PWM)-stimulated culture system using lymphocytes obtained from the mesenteric lymph nodes (MLN) of female subjects undergoing gastroplasty for obesity. Compared with peripheral blood lymphocytes, lymphocytes obtained from MLN secreted IgG, IgA and IgM isotypes that differ in pattern and distribution despite similar proportions of T cells and B cells expressing isotype-specific surface membrane immunoglobulin (SmIg). Among the isotypes secreted. IgA appeared to be increased relatively to other isotypes in MLN cultures. Crossover coculture experiments using T and B cells isolated from both MLN and blood by E-rosetting and cell panning procedures demonstrated that IgA was particularly sensitive to help and suppression exerted by MLN T cells and T cell subsets defined by monoclonal antibodies OKT4 and OKT8 respectively, when compared with similar subsets isolated from blood. The results presented provide a basis for study of gut handling of ingested antigen in man, and of disturbed immunoregulatory events in inflammatory and neoplastic disease of the human gut.

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