Rotenone inhibits delayed rectifier K+ current via a protein kinase A-dependent mechanism.

Abstract:

:Voltage-gated K+ channels (K(V)) regulate cell electrical properties, proliferation, migration, and death. Rotenone is a mitochondrial inhibitor, influencing activity of many channels that potentially participate in cell death processes, but its effect on K(V) channel in neurons remains unclear. This study used whole-cell patch clamp methods and found that rotenone concentration dependently decreased delayed rectifier K+ current (I(DR)) amplitude in cultured ventral mesencephalic neurons, but had no effect on A-type current (I(A)) peak amplitude. Furthermore, the protein kinase A inhibitor H-89 prevented rotenone-induced decrease in I(DR). The inhibition of I(DR) by rotenone was mimicked by extracellular application of forskolin. In summary, our results indicate that rotenone acutely decreased I(DR) currents in cultured mesencephalic neurons via a protein kinase A-dependent mechanism.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Gao XF,Wang W,He C

doi

10.1097/WNR.0b013e32830d149e

subject

Has Abstract

pub_date

2008-09-17 00:00:00

pages

1401-5

issue

14

eissn

0959-4965

issn

1473-558X

pii

00001756-200809170-00011

journal_volume

19

pub_type

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