title: Cells and mediators which participate in immunoglobulin synthesis by human mononuclear cells. I. The obligatory requirement of null lymphocytes in the synthesis of immunoglobulins in vitro.
abstract: The circulating mononuclear cells of normal adult human volunteers were fractionated into T and non-T lymphocytes. The T cells were then fractionated into TM and non-TM cells and the non-T cells were further fractionated, by both positive and negative isolation, into B cells and null cells. Culture of non-T cells, TM cells, and PWM for 7 to 8 days resulted in cytoplasmic Ig (cIg) synthesis by all B cells, as detected by immunofluorescence. However, culture of either purified B or null cells with TM cells and PWM resulted in a marked reduction (75%) of cIg-synthesizing cells. The addition of monocytes did not enhance cIg synthesis. Culture of reconstituted B and null cells with TM cells and PWM restored the capacity to synthesize cIg to the cells. It is concluded that null cells are required, as well as TM cells and PWM, for cIg synthesis by B cells.
authors.forename: M
authors.initials: M
authors.lastname: Richter
authors.forename: C A
authors.initials: CA
authors.lastname: Jodouin
mesh_terms: D001402:B-Lymphocytes / Q000276:immunology; D002478:Cells, Cultured; D006801:Humans; D007136:Immunoglobulins / Q000096:biosynthesis* / Q000276:immunology; D066298:In Vitro Techniques; D008214:Lymphocytes / Q000276:immunology* / Q000378:metabolism; D008215:Lymphocytes, Null / Q000276:immunology*; D009000:Monocytes / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology
chemical_list: D007136:Immunoglobulins