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• W2137339961 endingPage "1896" @default.
• W2137339961 startingPage "1888" @default.
• W2137339961 abstract "Previous studies have shown that two indazole compounds, lonidamine [1-(2,4-dichlorobenzyl)-indazole-3-carboxylic acid] and its analogue AF2785 [(1-(2,4-dichlorobenzyl)-indazol-3-acrylic acid], suppress fertility in male rats. We also found that these compounds inhibit the cystic fibrosis transmembrane conductance regulator chloride (CFTR-Cl−) current in epididymal epithelial cells. To further investigate how lonidamine and AF2785 inhibit the current, we used a spectral analysis protocol to study whole-cell CFTR current variance. Application of lonidamine or AF2785 to the extracellular membrane of rat epididymal epithelial cells introduced a new component to the whole-cell current variance. Spectral analysis of this variance suggested a block at a rate of 3.68 μmol−1/sec−1 and an off rate of 69.01 sec−1 for lonidamine, and an on rate of 3.27 μmol−1/sec−1 and an off rate of 108 sec−1 for AF2785. Single CFTR-Cl− channel activity using excised inside-out membrane patches from rat epididymal epithelial cells revealed that addition of lonidamine to the intracellular solution caused a flickery block (a reduction in channel-open time) at lower concentration (10 μM) without any effect on open channel probability or single-channel current amplitude. At higher concentrations (50 and 100 μM), lonidamine showed a flickery block and a decrease in open-channel probability. The flickery block by lonidamine was both voltage-dependent and concentration-dependent. These results suggest that lonidamine and AF2785, which are open-channel blockers of CFTR at low concentrations, also affect CFTR gating at high concentrations. We conclude that these indazole compounds provide new pharmacological tools for the investigation of CFTR. By virtue of their interference with reproductive processes, these drugs have the potential for being developed into novel male contraceptives." @default.
• W2137339961 created "2016-06-24" @default.
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• W2137339961 date "2002-12-01" @default.
• W2137339961 modified "2023-10-13" @default.
• W2137339961 title "Indazole Inhibition of Cystic Fibrosis Transmembrane Conductance Regulator Cl− Channels in Rat Epididymal Epithelial Cells1" @default.
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• W2137339961 doi "https://doi.org/10.1095/biolreprod.102.007450" @default.
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