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- W2464513308 abstract "Insulin-induced membrane changes were investigated in K(+)-depleted rat muscle. Male Sprague-Dawley rats were placed on a K(+)-free but otherwise adequate diet for 5-8 wk; serum K+ concentration ([K+]) dropped to 1.2-3.2 mM. Omohyoid membrane potential was -81 mV in 5.5 mM [K+] (SO4(2-)). Exposure to either insulin or low (0.5 mM) [K+] singly changed potential only slightly. The combination resulted in depolarization of 90% of fibers (-43 mV) and hyperpolarization of 10% of fibers (-101 mV). Fibers from normokalemic rats did not depolarize. Tetrodotoxin (TTX) blocked depolarization, implying the presence of noninactivating TTX-sensitive Na+ channels. K+ currents were measured using the three-electrode voltage clamp; movement of other ions was prevented by ion substitution, channel blockers, and depolarization-induced channel inactivation. K+ conductance was similar in control fibers with or without insulin. In the absence of insulin, currents in K(+)-depleted fibers were offset by a large leakage current that was significantly diminished when insulin was present. The insulin-induced current decrease was observed in nitrendipine, suggesting that the apparent decreased outward current was not an inward current carried by Ca2+. Data are consistent with altered Na+ and K+ channels in K(+)-depleted muscle, i.e., insulin-related closing of K+ channels initiates depolarization, which is then sustained by opening of noninactivating Na+ channels." @default.
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- W2464513308 date "1993-07-01" @default.
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- W2464513308 title "Insulin-induced membrane changes in K(+)-depleted rat skeletal muscle" @default.
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- W2464513308 doi "https://doi.org/10.1152/ajpcell.1993.265.1.c257" @default.
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