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- W1680355598 abstract "Abstract Cross-linking of membrane IgM (mIgM) on both normal resting B cells and on the murine B cell lymphoma WEHI-231 activates the phosphoinositide signal transduction pathway. The initial event in this pathway is the hydrolysis of phosphatidylinositol 4,5-bisphosphate (PtdInsP2), which results in the generation of two second-messengers: inositol trisphosphate (InsP3), which can cause the release of Ca2+ from intracellular stores, and diacylglycerol (DG), which activates protein kinase C. In examining the effects of exogenous activation of protein kinase C on WEHI-231 cells, we found that phorbol esters blocked some of the biologic effects of anti-IgM on WEHI-231 cells. The mechanism of this effect was investigated. Phorbol ester treatment of WEHI-231 cells blocked the ability of anti-IgM to stimulate production of inositol phosphates and accumulation of phosphatidic acid, the phosphorylated product of DG. Phorbol esters also blocked the ability of anti-IgM to cause an increase in intracellular Ca2+. Thus, it is clear that phorbol esters block anti-IgM-stimulated PtdInsP2 hydrolysis in WEHI-231 cells. In addition, a synthetic DG, dioctanoylglycerol (diC8), also blocked anti-IgM-stimulated inositol phosphate production and the anti-IgM-stimulated rise in cytoplasmic Ca2+. The ability of phorbol esters and diC8 to block mIgM-mediated signaling may reflect a feedback inhibition mechanism by which activated protein kinase C limits the magnitude and duration of receptor signaling." @default.
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- W1680355598 date "1987-02-01" @default.
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- W1680355598 title "Phorbol esters and dioctanoylglycerol block anti-IgM-stimulated phosphoinositide hydrolysis in the murine B cell lymphoma WEHI-231." @default.
- W1680355598 doi "https://doi.org/10.4049/jimmunol.138.3.868" @default.
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