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- W2009884538 abstract "The present studies were undertaken to define the contribution of the autologous or syngeneic mixed-leukocyte reactions (AMLR/SMLR) to the cellular proliferation observed in unfractionated spleen cell cultures. Proliferation was studied in whole, untreated 6-day murine spleen cell cultures supplemented with syngeneic serum. These cultures exhibited relatively low but significant levels of cellular proliferation as measured by uptake of radioactive thymidine ([3H]TdR). Treatment of spleen cells with monoclonal anti-Thy 1.2 antibody and complement before culture, the addition of specific anti-I-A monoclonal antibodies to the cultures or removal of Ia+ adherent cells before initiation of culture all inhibited the proliferative response significantly. Thus, the autologous proliferation of untreated and unfractionated spleen cells manifests the main characteristics of the AMLR/SMLR, namely, its dependence on T (responder) and Ia+ (stimulator) cells and specific inhibition by anti-I-A antibodies. A marked augmentation in cellular proliferation was observed in unfractionated spleen cell cultures treated for the initial 24 hr of culture with 5 × 10−6M indomethacin, an inhibitor of prostaglandin synthesis. Conversely, the addition of 7 × 10−9M prostaglandin E1 (PGE1) to these cultures depressed cellular proliferation. This suppression of autologous splenic cell proliferation induced by PGE1 could be partially reversed by the addition of concanavalin A-induced lymphokine (LK) preparations early in the culture. These findings indicate that (a) the proliferation of unfractionated spleen cell cultures occurring in the absence of exogenous stimulatory signals is due largely to an ongoing AMLR, and (b) biologically active mediators with opposing influences, namely, prostaglandins and immunostimulatory LK, participate in the regulation of the AMLR." @default.
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- W2009884538 date "1984-04-01" @default.
- W2009884538 modified "2023-10-14" @default.
- W2009884538 title "Spontaneous proliferation in unfractionated spleen cell cultures: Autologous mixed-lymphocyte reactions (AMLR) which can be differentially regulated by prostaglandins and lymphokines" @default.
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- W2009884538 doi "https://doi.org/10.1016/0008-8749(84)90101-1" @default.
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