Browsing by Author "BIERI, F"

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    POTENTIATION OF DIACYLGLYCEROL-ACTIVATED PROTEIN KINASE-C BY ACYL-COENZYME A THIOESTERS OF HYPOLIPEMIC DRUGS
    (1989) BRONFMAN, M; ORELLANA, A; MORALES, MN; BIERI, F; WAECHTER, F; STAUBLI, W; BENTLEY, P
    Acyl-Coenzyme A thioesters of the hypolipidaemic and cancerinogenic peroxisome proliferators clofibric acid, nafenopin, ciprofibrate, benzafibrate and tibric acid were found to greatly increase the activity of rat brain protein kinase C. Maximal activation required the simultaneous presence of Ca2+, phosphatidylserine and diolein, thus differentiating their action from that of other tumor promoters such as phorbol esters. Under similar conditions the unesterified drugs were comparatively ineffective. Similar results were obtained using the rat liver enzyme. The data suggest that acyl-coenzyme A thioesters of hypolipidaemic drugs, may play a role in the induction of liver tumors by these compounds, through the potentiation of protein kinase C.