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. 1991 Apr;2(4):311–316. doi: 10.1091/mbc.2.4.311

Differential dependence of early and late increases in 1,2-diacylglycerol on the presence of catalytically active alpha-thrombin: evidence for regulation at the level of 1,2-diacylglycerol generation.

L A Rangan 1, T M Wright 1, D M Raben 1
PMCID: PMC361783  PMID: 2059659

Abstract

alpha-Thrombin stimulates a biphasic increase in cellular 1,2-diacylglycerol mass in quiescent IIC9 fibroblasts. This report describes the use of hirudin, a high-affinity inhibitor of alpha-thrombin that renders it catalytically inactive, to investigate the dependence of elevated 1,2-diacylglycerol levels on the presence of catalytically active alpha-thrombin. When cultures were incubated in the presence of alpha-thrombin, 1,2-diacylglycerol levels remained elevated for greater than or equal to 4 h. Inactivation of alpha-thrombin after 15 s did not alter the kinetics of 1,2-diacylglycerol formation occurring over the next 1 h. However, sustained (1-4 h) increases in this lipid were eliminated. Inactivation of alpha-thrombin after 1 h of stimulation resulted in 1) an immediate and reversible decline in 1,2-diacylglycerol levels, 2) elimination of the sustained phase of 1,2-diacylglycerol production, 3) inhibition of the alpha-thrombin-stimulated generation of choline metabolites, and 4) a blunted mitogenic response to alpha-thrombin. These data indicate that early (0-1 h) and late (1-4 h) increases in 1,2-diacylglycerol are differentially dependent on the presence of catalytically active alpha-thrombin. Furthermore, sustained increases in 1,2-diacylglycerol in response to alpha-thrombin are regulated at least in part at the level of generation (via phosphatidylcholine hydrolysis). Our results also support a role for sustained 1,2-diacylglycerol levels in the mitogenic response.

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Selected References

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