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• W1557196074 abstract "P-glycoprotein, an active transporter that pumps a diverse range of hydrophobic compounds out of cells, has recently been proposed to function as, or regulate, a volume-activated, anion-selective channel (Valverde, M.A., Diaz, M., Sepulveda, F. V., Gill, D. R., Hyde, S. C., and Higgins, C. F. (1992) Nature 355, 830-833). In this study a number of compounds known to inhibit P-glycoprotein-mediated drug pumping were tested for their effect on the osmotically activated release from HeLa cells of I-, a known substrate of volume-activated anion channels, and taurine, a sulfonic amino acid that serves as an important organic osmolyte in many cell-types. Tamoxifen, 4-iodotamoxifen, and pyrrolidino-4-iodotamoxifen (idoxifene) were potent blockers of osmotically activated I- and taurine efflux. Other known P-glycoprotein inhibitors (verapamil, cyclosporin A, pimozide, trifluoperazine, ICI 164, and ICI 182) were less effective. For all compounds tested the effect on taurine release was the same as that on I- release, consistent with the hypothesis that swelling-activated taurine release is via anion-selective channels. There was no positive correlation between the effect of the inhibitors on osmotically activated solute release and their effect on P-glycoprotein-mediated drug transport. In contrast, there was a strong positive correlation between the IC50 values for the effect of the inhibitors on volume-activated solute release and those for their effect on calmodulin. These data raise doubts as to whether the effect of P-glycoprotein inhibitors on volume-activated channels is a consequence of their interaction with P-glycoprotein and indicate a possible role for calmodulin, or a cell component having at least some physical similarities, in controlling channel activity." @default.
• W1557196074 created "2016-06-24" @default.
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• W1557196074 date "1994-11-01" @default.
• W1557196074 modified "2023-10-18" @default.
• W1557196074 title "Inhibition of volume-activated I- and taurine efflux from HeLa cells by P-glycoprotein blockers correlates with calmodulin inhibition." @default.
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• W1557196074 doi "https://doi.org/10.1016/s0021-9258(18)43891-4" @default.
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