The effect of corticosteroid-binding globulin on the in vitro incorporation of thymidine into human lymphocytes.

The purpose of these studies was to examine the inhibitory effect of human corticosteroid-binding globulin (CBG) on the mitogenic effect of phytohemagglutinin on cultured human lymphocytes. We found that CBG could inhibit the incorporation of [14C] thymidine into lymphocytes, but the observed inhibition could be accounted for by the cortisol which was bound to the purified CBG, CBG stripped of cortisol or bound to 11-deoxycortisol was inactive in this assay.

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