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  • Title: Forskolin potentiates isoproterenol induced beta adrenoceptor desensitization in intact human lymphocytes.
    Author: Yu JL, Hui KK.
    Journal: Res Commun Chem Pathol Pharmacol; 1988 Jul; 61(1):3-16. PubMed ID: 2845534.
    Abstract:
    The effects of forskolin on L-isoproterenol induced beta adrenoceptor desensitization in intact human lymphocytes from healthy subjects were studied. Exposure of intact lymphocytes to 50 microM L-isoproterenol for 150 minutes at 37 degrees C induced a 18% loss in beta adrenergic receptor density (Bmax) as characterized by using [3H]-DHA at 25 degrees C (23% loss, at 4 degrees C) as well as a significant loss in cyclic AMP responsiveness of the cell to isoproterenol restimulation. The addition of 10 microM forskolin to 50 microM isoproterenol potentiated isoproterenol induced beta 2 adrenoceptor desensitization as shown by further reduction in [3H]-DHA binding sites (decreased by 40% at 25 degrees C, 45% at 4 degrees C) and corresponding decrease in cyclic AMP responsiveness. These suggest that isoproterenol and forskolin act in a cooperative manner not only in the activation of adenylate cyclase and cyclic AMP generation but also in the regulation of hormone receptor and adenylate cyclase coupling.
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