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KChIP2b modulates the affinity and use-dependent block of Kv4.3 by nifedipine.

Abstract：

:Rapidly activating Kv4 voltage-gated ion channels are found in heart, brain, and diverse other tissues including colon and uterus. Kv4.3 can co-assemble with KChIP ancillary subunits, which modify kinetic behavior. We examined the affinity and use dependence of nifedipine block on Kv4.3 and its modulation by KChIP2b. Nifedipine (150 microM) reduced peak Kv4.3 current approximately 50%, but Kv4.3/KChIP2b current only approximately 27%. Nifedipine produced a very rapid component of open channel block in both Kv4.3 and Kv4.3/KChIP2b. However, recovery from the blocked/inactivated state was strongly sensitive to KChIP2b. Kv4.3 Thalf,recovery was slowed significantly by nifedipine (120.0+/-12.4 ms vs. 213.1+/-18.2 ms), whereas KChIP2b eliminated nifedipine's effect on recovery: Kv4.3/KChIP2b Thalf,recovery was 45.3+/-7.2 ms (control) and 47.8+/-8.2 ms (nifedipine). Consequently, Kv4.3 exhibited use-dependent nifedipine block in response to a series of depolarizing pulses which was abolished by KChIP2b. KChIPs alter drug affinity and use dependence of Kv4.3.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Bett GC,Morales MJ,Strauss HC,Rasmusson RL

doi

10.1016/j.bbrc.2005.12.135

subject

Has Abstract

pub_date

2006-02-24 00:00:00

pages

1167-77

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)02874-3

journal_volume

340

pub_type

杂志文章

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