Abstract
The perforated patch clamp method was used to study the effect of the agonist of beta-adrenoreceptors isoproterenol on L-type Ca2+ current in cardiocytes of rats and ground squirrels in two states: active and hibernating. It is shown that isoproterenol exerts a dual effect on Ca2+ currents of rats and ground squirrels in the active state: at V h = −50 mV, the current increases, whereas at V h = −30 mV, it decreases. In hibernating ground squirrels, the dual effect of isoproterenol is not observed: isoproterenol increases Ca2+ current at any V h values. The hypothesis is put forward that, during the entrance of ground squirrels into hibernation, the phosphorylation of one of the sites (not cAMP-dependent) of L-type Ca2+ channels is blocked.
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Kokoz, Y.M., Grichenko, A.S., Korystova, A.F. et al. Effect of Isoproterenol on the L-type Ca2+ Current in Cardiac Cells from Rats and Hybernating Ground Squirrels. Biosci Rep 19, 17–25 (1999). https://doi.org/10.1023/A:1020141922904
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DOI: https://doi.org/10.1023/A:1020141922904