Evidence that the bradykinin-induced activation of phospholipase D and of the mitogen-activated protein kinase cascade involve different protein kinase C isoforms.

The Journal of Biological Chemistry
K J Clark, A W Murray

Abstract

The effect of alkylglycerol supplementation on protein kinase C (PKC)-mediated signaling events has been studied in fibroblasts from Zellweger patients (SF 3271 cells). Western blotting analysis established that Zellweger fibroblasts express PKC alpha, epsilon, and zeta. Incubation with bradykinin induced a rapid transient translocation of PKC alpha and a more sustained translocation of PKC epsilon to the particulate fraction; translocation of PKC zeta was unaffected. Bradykinin-induced translocation and activation of PKC alpha, but not translocation of PKC epsilon, was blocked in SF 3271 cells which had been incubated with 1-O-hexadecylglycerol (1-O-HDG; 20 micrograms/ml) for 24 h and then incubated in the absence of 1-O-HDG and serum for a further 24 h. Supplementation with 1-O-HDG increased the mass of ether-linked phospholipid. Bradykinin initiated a transient increase in cytosolic Ca2+ concentration in both control and 1-O-HDG supplemented cells, indicating that the initial receptor linked events were not affected by 1-O-HDG supplementation. Bradykinin also caused a rapid activation of phospholipase D (PLD), measured by phosphatidylbutanol accumulation, and mitogen-activated protein kinase (MAPK) determined by myelin basic...Continue Reading

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