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• W2023846794 startingPage "2296" @default.
• W2023846794 abstract "This article shows that colchicine and taxol strongly influence the kinetics of L-type Ca channels in intact cardiac cells, and it suggests a mechanism for this action. It is known that colchicine disassociates microtubules into tubulin, and that taxol stabilizes microtubules. We have found that colchicine increases the probability that Ca channels are in the closed state and that taxol increases the probability they are in the open state. Moreover, taxol lengthens the mean open time of Ca channels. In this regard, taxol is similar to Bay-K 8644; however, Bay K works on inside-out patches, but taxol does not. Neither colchicine nor taxol alters the number of Ca channels in a patch. We have quantified these results as follows. It is known that L-type channels in embryonic chick heart ventricle cells have voltage- and current-dependent inactivation. In 10 mM Ba, channel conductance is linear in the range -10 to 20 mV. The conductance is 12 +/- 1 pS, and the extrapolated reversal potential is 42 +/- 2 mV (n = 3). In cell-attached patches, inactivation depends on the number of channels. One channel (holding at -80 mV and stepping to 0 mV for 500 ms) shows virtually no inactivation. However, three channels inactivate with a time constant of 360 +/- 20 ms (n = 6). In similar patches, colchicine (80 microM for 15 min) decreases the inactivation time constant to 162 +/- 33 ms (n = 4) and taxol (50 microM for 10 min) virtually abolishes inactivation (time constant 812 +/- 265 ms (n = 4)). We suggest that colchicine and taxol affect Ca channels through their action on the cytoskeleton, which in turn regulates the effective concentration of inactivating ions near the mouths of channels. An alternate explanation is that free tubulin interacts directly with Ca channels." @default.
• W2023846794 created "2016-06-24" @default.
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• W2023846794 date "1994-12-01" @default.
• W2023846794 modified "2023-10-18" @default.
• W2023846794 title "Inactivation of L-type Ca channels in embryonic chick ventricle cells: dependence on the cytoskeletal agents colchicine and taxol" @default.
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• W2023846794 doi "https://doi.org/10.1016/s0006-3495(94)80715-5" @default.
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