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• W2064155557 abstract "The ATP-regulated potassium (KATP) channel in the pancreatic beta cell couples the metabolic state to electrical activity. The primary regulator of the KATP channel is generally accepted to be changes in ATP/ADP ratio, where ATP inhibits and ADP activates channel activity. Recently, we showed that long-chain CoA (LC-CoA) esters form a new class of potent KATP channel activators in rodents, as studied in inside-out patches.In this study we have investigated the effects of LC-CoA esters in human pancreatic beta cells using the inside-out and whole-cell configurations of the patch clamp technique.Human KATP channels were potently activated by acyl-CoA esters with a chain length exceeding 12 carbons. Activation by LC-CoA esters did not require the presence of Mg2+ or adenine nucleotides. A detailed characterization of the concentration-dependent relationship showed an EC50 of 0.7+/-0.1 micromol/l. Furthermore, in the presence of an ATP/ADP ratio of 10 (1.1 mmol/l total adenine nucleotides), whole-cell KATP channel currents increased approximately six-fold following addition of 1 micro mol/l LC-CoA ester. The presence of 1 micro mol/l LC-CoA in the recording pipette solution increased beta-cell input conductance, from 0.5+/-0.2 nS to 2.5+/-1.3 nS.Taken together, these results show that LC-CoA esters are potent activators of the KATP channel in human pancreatic beta cells. The fact that LC-CoA esters also stimulate KATP channel activity recorded in the whole-cell configuration, points to the ability of these compounds to have an important modulatory role of human beta-cell electrical activity under both physiological and pathophysiological conditions." @default.
• W2064155557 created "2016-06-24" @default.
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• W2064155557 date "2004-02-01" @default.
• W2064155557 modified "2023-10-15" @default.
• W2064155557 title "Long-Chain CoA esters activate human pancreatic beta-cell K ATP channels: potential role in Type 2 diabetes" @default.
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• W2064155557 doi "https://doi.org/10.1007/s00125-003-1299-x" @default.
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