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- W2305363331 abstract "Effects of a new hypoglycemic drug, N-[trans-4-isopropylcyclohexy-carbonyl]-D-phenylalanine (A-4166), on membrane current were investigated using the patch-clamp technique in single pancreatic beta-cells isolated from rats. A-4166, at a concentration of 10 microM, depolarized membrane potential of beta-cells and evoked action potentials in the presence of 2.8 mM glucose. The single ATP-sensitive K+ channel (K-ATP channel) current recorded in cell-attached membrane patches was reversibly inhibited by A-4166 (> 0.1 microM) without a change in the single-channel conductance of the K-ATP channel. Both A-4166 and tolbutamide inhibited the whole cell K-ATP channel current with half-maximum inhibition (IC50) of 0.23 and 12.8 microM, respectively (Hill coefficient = 1). In inside-out membrane patches, the IC50 with A-4166 occurred at 4.5 nM, in contrast to 0.7 microM for tolbutamide. A-4166 did not affect L- and T-type Ca2+ channels or the time-dependent outward current. We conclude that A-4166 specifically blocks the K-ATP channel and that the blockade is more potent than that of tolbutamide. The action of A-4166 underlies the mechanism by which the drug stimulates insulin secretion from beta-cells." @default.
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- W2305363331 date "1995-02-01" @default.
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- W2305363331 title "A new hypoglycemic agent, A-4166, inhibits ATP-sensitive potassium channels in rat pancreatic beta-cells" @default.
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- W2305363331 doi "https://doi.org/10.1152/ajpendo.1995.268.2.e185" @default.
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