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  • Title: Inhibition of insulin receptor binding by A23187: synergy with phorbol esters.
    Author: Rouis M, Thomopoulos P, Cherier C, Testa U.
    Journal: Biochem Biophys Res Commun; 1985 Jul 16; 130(1):9-15. PubMed ID: 3927905.
    Abstract:
    The ionophore A23187 inhibits the binding of insulin on U-937 monocyte-like cells which had been induced to differentiate by 1 alpha, 25-(OH)2 cholecalciferol, while it remains inactive on the undifferentiated cells. A 50% reduction of the specific binding of 125I-insulin is observed within 20 to 30 min at 37 degrees C. The effect is obtained at 10(-7)M to 10(-6)M A23187. It is reversible in 60 min at 37 degrees C. A suboptimal concentration of the ionophore potentiates the inhibitory action of phorbol esters on insulin binding.
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