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. 1986 Aug 15;238(1):109–113. doi: 10.1042/bj2380109

Thrombin, unlike vasopressin, appears to stimulate two distinct guanine nucleotide regulatory proteins in human platelets.

M D Houslay, D Bojanic, D Gawler, S O'Hagan, A Wilson
PMCID: PMC1147103  PMID: 3099763

Abstract

The thrombin-stimulated GTPase activity of human platelets was additive with respect to the GTPase stimulation effected by prostaglandin E1, but not with that stimulated by adrenaline, vasopressin and platelet-activating factor (PAF). Treatment of platelet membranes with pertussis toxin partially inhibited the thrombin-stimulated GTPase, but had no effect on the vasopressin-stimulated GTPase activity, whereas cholera toxin treatment had no effect on either of these stimulated GTPase activities. Thrombin, adrenaline and PAF, but not vasopressin, inhibited the adenylate cyclase activity of isolated plasma membranes through the action of Ni only, this being inhibited by pertussis toxin. It is suggested that thrombin exerts effects through both the inhibitory guanine nucleotide regulatory protein Ni and through the putative guanine nucleotide regulatory protein, Np, involved in regulating receptor-stimulated inositol phospholipid metabolism. However, vasopressin appears to exert its effects solely through the putative Np.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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