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• W2144142030 endingPage "1686" @default.
• W2144142030 startingPage "1678" @default.
• W2144142030 abstract "The recently cloned T-type calcium channel alpha1I (Cav3.3) displays atypically slow kinetics when compared to native T-channels. Possible explanations might involve alternative splicing of the alpha1I subunit, or the use of expression systems that do not provide a suitable environment (auxiliary subunit, phosphorylation, glycosylation...). In this study, two human alpha1I splice variants, the alpha1I-a and alpha1I-b isoforms that harbour distinct carboxy-terminal regions were studied using various expression systems. As the localization of the alpha1I subunit is primarily restricted to neuronal tissues, its functional expression was conducted in the neuroblastoma/glioma cell line NG 108-15, and the results compared to those obtained in HEK-293 cells and Xenopus oocytes. In Xenopus oocytes, both isoforms exhibited very slow current kinetics compared to those obtained in HEK-293 cells, but the alpha1I-b isoform generated faster currents than the alpha1I-a isoform. Both activation and inactivation kinetics of alpha1I currents were significantly faster in NG 108-15 cells, while deactivating tail currents were two times slower, compared to those obtained in HEK-293 cells. Moreover, the alpha1-b isoform showed significantly slower deactivation kinetics both in NG 1080-15 and in HEK-293 cells. Altogether, these data emphasize the advantage of combining several expression systems to reveal subtle differences in channel properties and further indicate that the major functional differences between both human alpha1I isoforms are related to current kinetics. More importantly, these data suggest that the expression of the alpha1I subunit in neuronal cells contributes to the normalization of current kinetics to the more classical, fast-gated T-type Ca2+ current." @default.
• W2144142030 created "2016-06-24" @default.
• W2144142030 creator A5037127640 @default.
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• W2144142030 creator A5061728673 @default.
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• W2144142030 date "2001-11-01" @default.
• W2144142030 modified "2023-10-04" @default.
• W2144142030 title "The α_1IT-type calcium channel exhibits faster gating properties when overexpressed in neuroblastoma/glioma NG 108-15 cells" @default.
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• W2144142030 doi "https://doi.org/10.1046/j.0953-816x.2001.01796.x" @default.
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