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- W1971716310 abstract "In order to identify the intracellular transmitter in the phototransduction process in the retinal rod, the action of cGMP, 2',3'cGMP, cAMP, GMP and Ca2+ on the isolated inside-out patches of the plasma membrane of retinal rods of the frog (Rana temporaria) was studied. cGMP applied at the intracellular membrane surface markedly increased the conductance of patches. The action of cGMP took place in the absence of nucleoside triphosphates and, hence, was not mediated by protein phosphorylation. The dependence of cGMP-induced component of conductance on cGMP concentration was S-shaped, with half-saturation within 10-30 microM and a Hill coefficient of about 1.7-1.8. cAMP, 2',3'cGMP, GMP (1 mM) did not exhibit any action on the membrane. Ca2+ did not affect the patch conductance in the absence of cGMP. In the presence of cGMP, lowering Ca2+ concentration from 10(-3) to 10(-8) M decreased the cGMP-dependent component of conductance by 20-30%. The approximate value of the elementary event underlying the cGMP-induced conductance estimated from the magnitude of the variance of the cGMP-induced current is within 100-250 fS. We suppose that the cGMP-activated channels found by us provide the light-sensitive conductance of the rod plasma membrane in vivo and that cGMP is the intracellular transmitter acting in the phototransduction process." @default.
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- W1971716310 date "1986-04-01" @default.
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- W1971716310 title "Direct action of cGMP on the conductance of retinal rod plasma membrane" @default.
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- W1971716310 doi "https://doi.org/10.1016/0005-2736(86)90162-8" @default.
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