國家衛生研究院 NHRI:Item 3990099045/7533
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    題名: Methamphetamine inhibits voltage-gated potassium currents in NG108-15 cells: Possible contribution to large-conductance calcium-activated potassium channels
    作者: Wang, YJ;Chan, MH;Chen, HH
    貢獻者: Center for Neuropsychiatric Research
    摘要: Methamphetamine (MA), a highly abused amphetamine-like psychostimulant, has surged in popularity worldwide in the last decade. Repeated MA exposure has been shown to affect the alternative splice variant expression of large conductance Ca2+-activated K+ (BK) channels. It remains unclear whether MA affects BK channel activity. The present study investigated the effects of MA on BK channels in NG108-15 mouse neuroblastomaxrat glioma hybrid cells using whole-cell and cell-attached patch clamp techniques. In whole-cell recordings, the macroscopic K+ outward currents were inhibited by MA with an EC50 of 146muM, but not affected by dopamine (DA). It implies that DA is not involved in the effects of MA on K+ outward currents. In cell-attached patches, MA significantly decreased BK channel activity. Moreover, MA significantly decreased the BK channel opener NS1619-evoked whole-cell K+ outward currents and BK channel activity. Finally, the effect of MA on membrane potential was examined by current-clamp configuration. MA caused membrane depolarization and application of NS1619 returned the depolarized potential to resting value. These findings suggest that MA might act as an inhibitor of BK channels, and thereby increase the neuronal excitability and enhance neurotransmitter release.
    日期: 2013-11
    關聯: Toxicology Letters. 2013 Nov;223(2):139-145.
    Link to: http://dx.doi.org/10.1016/j.toxlet.2013.08.021
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0378-4274&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000326684600005
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84886300430
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