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Biochim Biophys Acta. 1982 Feb 25;714(3):415-21.

Regulation of protein kinases activity by quercetin in Ehrlich ascites tumor cells.


Cyclic AMP-independent protein kinase activities from Ehrlich ascites tumor cells, partially purified by DEAE-cellulose and phosphocellulose chromatography were inhibited by quercetin. The cyclic AMP in the tumor ascites cells and the cyclic AMP-dependent protein activity from this tumor and from bovine and mouse tissues were unaffected by this drug. Since we reported that quercetin elevates cyclic AMP level in Ehrlich ascites tumor cells, this bioflavonoid may have a dual effect on the protein kinase activities in these cells, thus, increasing the cyclic AMP-dependent and decreasing the cyclic AMP-independent protein kinase activities.

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