SK4 Encodes Intermediate Conductance Ca2+-Activated K+ Channels in Mouse Urinary Bladder Smooth Muscle Cells
Open Access
- 1 January 2000
- journal article
- Published by Elsevier in The Japanese Journal of Pharmacology
- Vol. 84 (1) , 97-100
- https://doi.org/10.1254/jjp.84.97
Abstract
The single channel current of intermediate conductance Ca2 +-activated K+ channel (IK channel) was measured in mouse urinary bladder myocytes (MBM), and the molecular basis of the channel was suggested to be the SK4 subtype by RT-PCR. Among Ca2+-activated K+ channel subtypes (SK2, SK3, SK4 and BK), the mRNAs of SK4 and BK were predominantly expressed in MBM. IK channel currents recorded from MBM showed: 38.7 pS slope conductance under symmetrical 140 mM K+ conditions, Ca2+-dependent activation, and blockade by charybdotoxin and econazole. These results strongly suggest that SK4 encodes IK channels in MBM.Keywords
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