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- W1570757548 abstract "Rabbit lymph node cell populations cultured in vitro in the presence of fetal calf serum are induced to produce immunoglobulin M-secreting cells. The induction of such immunoglobulin production, measured by the capacity of the cell population to secrete immunoglobulins, was inhibited when cells were cultured with sera from a variety of species despite the presence of fetal calf serum. The addition of such inhibitory serum 36 hours after initiation of the cell culture or thereafter was without effect on the extent of induction of immunoglobulin production. On the other hand, the presence of inhibitory serum in culture during only the first 24 hours yielded the same inhibition as when serum was present throughout the 72-hour culture period. Inhibitory sera also suppressed the incorporation of thymidine into DNA. The induction of immunoglobulin production and the incorporation of thymidine into DNA were essentially equally inhibited by the same range of serum concentrations. Unlike conventional inhibitors of DNA synthesis, the inhibitory sera exhibited selective specificity with regard to the kind of cells that could be affected. Thus, such sera inhibited the DNA synthesis of lymph node cells cultured in the presence of fetal calf serum but did not inhibit concanavalin A-stimulated DNA synthesis of such cultured cells and, similarly, serum did not inhibit DNA synthesis of thymus cells cultured in the presence of fetal calf serum. The sera of all species examined were inhibitory except for fetal sera. As judged from a quantitative assay, bovine and porcine serum contained the highest titer of inhibitor, whereas sera from human, rat, mouse, and rabbit were clustered in a group exhibiting less inhibitor. Ascites fluid and lymph node extracellular fluids contained less inhibitor than found in the serum of the same animal and lysates of washed lymph node cells were devoid of inhibitor. Although fetal bovine serum and newborn bovine serum did not contain the inhibitor, it was detectable within 24 hours of parturition. The inhibitor is of relatively large apparent molecular weight (about 300,000) and has been purified about 70-fold." @default.
- W1570757548 created "2016-06-24" @default.
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- W1570757548 date "1976-04-01" @default.
- W1570757548 modified "2023-09-29" @default.
- W1570757548 title "Differentiation of lymphoid cells. A selective anti-mitogenic component of normal serum which inhibits the induction of immunoglobulin production." @default.
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- W1570757548 doi "https://doi.org/10.1016/s0021-9258(17)33611-6" @default.
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