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- W329411700 abstract "The authors utilized the frog erythrocyte (FE) as a ..beta..-adreneric receptor (..beta..AR) model system in which to study homologous desensitization. Preincubation with isoproterenol (ISO) leads to a 50% decline in ISO-stimulated adenylate cyclase (AC) activity without significant changes in basal, PGE/sub 1/-, NaF-, GppNHp-, forskolin-, or MnCl/sub 2/-stimulated AC activities. ISO treatment also induces the sequestration of ..beta..AR from the cell surface as evidenced by a 35% decline in (/sup 3/H)CGP-12177 binding sites on the surface of intact FE. Treatment of intact FE with ISO also promotes ..beta..AR phosphorylation to 2 mol PO/sub 4//mol of ..beta..AR. At 25/sup 0/C, the time courses of ISO-induced AC desensitization, ..beta..AR sequestration and ..beta..AR phosphorylation are identical occurring without a lag and exhibiting a t 1/2 of 30 min and a maximal response at 2.5 hrs. The sequestered ..beta..AR can be partially recovered upon cell lysis in a light membrane fraction (LMF), separable from the plasma membranes using sucrose gradients or differential centrifugation. ..beta..AR phosphorylation is reversed in the sequestered LMF exhibiting a PO/sub 4//..beta..AR stoichiometry of 0.7 mol/mol - similar to that observed under basal conditions. These data suggest that phosphorylation of ..beta..AR in the plasma membrane promotes their translocation away from themore » cell surface into a sequestered membrane domain where the phosphorylation is reversed, thus, enabling the return of ..beta..AR back to the cell surface and recoupling with AC.« less" @default.
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- W329411700 date "1986-03-05" @default.
- W329411700 modified "2023-09-27" @default.
- W329411700 title "Homologous desensitization of adenylate cyclase: the role of. beta. -adrenergic receptor phosphorylation and dephosphorylation" @default.
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