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- W2020756415 abstract "Although raising intracellular cyclic adenosine monophosphate (cAMP) levels is generally considered to be inhibitory on the mitogen-induced T cell proliferation, in this study we have shown that the addition of either dbcAMP (50 microM) or cholera toxin (1 ng/ml) resulted in an increase in [3H]thymidine uptake in PBMC cultures stimulated with phorbol ester, 12-tetradecanoylphorbol 13-acetate (TPA), or with a combination of TPA plus anti-CD3 mAb (mAb 235). In contrast, under similar culture conditions, the phytohemagglutinin-P (PHA-P) response was inhibited by these agents as has been reported. The augmentative effect of dbcAMP in PBMC cultures was due to an increase in IL-2 production and not to increased in IL-2R-alpha chain expression. The enhancing effect of dbcAMP and CT observed with PBMC was monocyte dependent and not seen with purified T cell preparations. The addition of monocytes reconstituted the ability of intracellular cAMP elevating agents to augment the T cell response to TPA with and without mAb to CD3. The monocytes mediate their action via soluble factor(s) with molecular weight (m.w.) of more than 10 kDa. Neither rIL-1, rIL-6, nor rTNF-alpha have any augmentative effect as contrast with the supernatant from treated monocytes. Taken together, our results indicate that cAMP can play a positive regulatory role in T cell proliferation due to factor(s) secreted by dbcAMP-treated monocytes resulting in increased IL-2 synthesis in T cells." @default.
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- W2020756415 date "1992-12-01" @default.
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- W2020756415 title "Augmentation of phorbol ester-induced T cell proliferation by agents which raise intracellular cyclic adenosine monophosphate" @default.
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- W2020756415 doi "https://doi.org/10.1016/0008-8749(92)90328-m" @default.
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