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- W1763105928 abstract "Abstract Human neutrophils treated with phorbol 12-myristate 13-acetate (PMA) or dioctanoylglycerol exhibited a large (10-fold), sustained accumulation of the mass of diradylglycerol, beginning 1 min after stimulation and continuing for 30 to 60 min. Phorbol dibutyrate was less potent than PMA in stimulating diradylglycerol accumulation, whereas the 4-alpha analogs of PMA and phorbol dibutyrate were inactive. Submaximal concentrations of PMA (0.5 to 2.5 nM) plus the calcium ionophore, ionomycin (15 to 60 nM), led to synergistic accumulation of diradylglycerols. Chlorpromazine and sphingosine, inhibitors of protein kinase C, blocked PMA-stimulated accumulation of diradylglycerol with IC50 concentrations of 32 and 9 microM, respectively, paralleling their inhibition of PMA-stimulated O2- production. These compounds also inhibited the ionomycin-stimulated accumulation of diradylglycerols. A third protein kinase C inhibitor, H-7, was less effective, inhibiting PMA-stimulated accumulation of diradylglycerol by 25% at 100 microM. Differential sensitivity to alkaline hydrolysis suggests that diradylglycerols that accumulate in response to PMA or ionomycin stimulation are composed of a mixture of two distinct diglyceride species, diacylglycerols and alkylacylglycerols. Whereas diacylglycerol may activate cellular protein kinase C, the importance of the production of alkylacylglycerols is uncertain." @default.
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- W1763105928 date "1988-01-01" @default.
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- W1763105928 title "Phorbol diesters and dioctanoylglycerol stimulate accumulation of both diacylglycerols and alkylacylglycerols in human neutrophils." @default.
- W1763105928 doi "https://doi.org/10.4049/jimmunol.140.1.200" @default.
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