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. 1991 Sep 1;278(Pt 2):475–480. doi: 10.1042/bj2780475

Protein kinase C regulates the stimulated accumulation of 3-phosphorylated phosphoinositides in platelets.

W G King 1, G L Kucera 1, A Sorisky 1, J Zhang 1, S E Rittenhouse 1
PMCID: PMC1151369  PMID: 1716881

Abstract

We have shown that platelets stimulated with thrombin or guanosine 5'-[gamma-thio]triphosphate (GTP[S]), both of which activate phospholipase C and protein kinase C (PKC), show enhancement of 3-phosphorylated phosphoinositide accumulation (3-PPI). We now report the following. (1) Inhibition of thrombin- or GTP[S]-stimulated PKC by pseudo-substrate peptide (RFARK) added to permeabilized platelets markedly inhibits 3-PPI, whereas the serine/threonine phosphatase inhibitor, okadaic acid, promotes 3-PPI. PKC activity, insufficient in itself for fully activating 3-PPI, appears crucial to receptor and post-receptor stimulation of 3-PPI, even when tyrosine phosphorylation is unimpaired. (2) Alteration of Gi by ADP-ribosylation only slightly affects the stimulation of 3-PPI by thrombin, and activation of the G-protein Gi by adrenaline has no effect on 3-PPI. (3) Inhibition of PKC blocks activated secretion of platelet-derived growth factor (PDGF). However, PDGF cannot promote platelet 3-PPI, and thus cannot account for the inhibitory effects of RFARK on 3-PPI.

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Selected References

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