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Inhibition of phosphatidylcholine synthesis by vasopressin and angiotensin in rat hepatocytes.

ABSTRACT: The addition of 1 microM-vasopressin or -angiotensin to isolated rat hepatocytes induced a fast transient inhibition of the rate of incorporation of [Me-3H]choline into phosphatidylcholine. The cationophore A23187 induced a similar inhibition of phosphatidylcholine synthesis. The addition of micromolar Ca2+ to rat liver microsomes inhibited the activity of CDP-choline: 1,2-diacylglycerol cholinephosphotransferase. This inhibition is due a decrease in the Vmax. of the enzyme without affecting the Km for CDP-choline. It is concluded that Ca2+ regulates phosphatidylcholine synthesis in rat liver.

SUBMITTER: Alemany S 

PROVIDER: S-EPMC1153983 | biostudies-other | 1982 Nov

REPOSITORIES: biostudies-other

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