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- W1781325596 abstract "Abstract The optimal culture and assay conditions for the detection of spontaneously occurring and pokeweed mitogen (PWM)-induced polyvalent Ig (IgG + IgM + IgA) and individual Ig class-specific plaque-forming cells (PFC) in human peripheral blood have been described in detail. Culture conditions are critical, particularly with regard to cell density and batches of supplemental serum. Fetal calf serum is a much more supportive serum supplement for PWM-induced PFC than is human serum. The assay system is a modified reverse hemolytic PFC assay using staphylococcal protein A coupled to sheep red blood cells by the chromic chloride method. PFC are developed by rabbit anti-human polyvalent Ig or anti-human individual Ig class antisera. Human peripheral blood contains 468 (±78) spontaneously occurring Ig secreting PFC per 10 6 lymphocytes at Day 0 and 20,500(± 1971) PWM-induced Ig secreting PFC after 6 days in culture. The response is T-cell dependent; however, T cells can be replaced by a soluble T-cell factor prepared from a 48-hr allogeneic mixed lymphocyte reaction supernatant. The relative dependence on monocytes is a reflection of the culture conditions employed. Under the conditions of round-bottom tubes which promote cell-to-cell contact, depletion of monocytes to 0 to 2% does not result in a diminution of PFC responses. In fact, under such conditions, in certain individuals monocytes are markedly suppressive such that removal of monocytes results in a substantial enhancement of PFC responses. This system is simple and reproducible and should prove extremely useful in the delineation of the mechanisms of B-cell triggering and immunoregulation in normals and in disease states." @default.
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- W1781325596 date "1980-08-01" @default.
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- W1781325596 title "Activation of human B lymphocytes" @default.
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- W1781325596 doi "https://doi.org/10.1016/0008-8749(80)90204-x" @default.
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