Calcineurin regulates M channel modal gating in sympathetic neurons.

Abstract:

:The M current regulates neuronal excitability, with its amplitude resulting from high open probability modal M channel behavior. The M current is affected by changing intracellular calcium levels. It is proposed that internal calcium acts by regulating M channel modal gating. Intracellular application of a preactivated form of the calcium-dependent phosphatase calcineurin (CaN420) inhibited the macroscopic M current, while its application to excised inside-out patches reduced high open probability M channel activity. Addition of ATP reversed the action of CaN420 on excised patches. The change in M channel gating induced by CaN420 was different from the effect of muscarine. A kinetic model supports the proposition that shifts in channel gating induced by calcium-dependent phosphorylation and dephosphorylation control M current amplitude.

journal_name

Neuron

journal_title

Neuron

authors

Marrion NV

doi

10.1016/s0896-6273(00)80033-1

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

163-73

issue

1

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(00)80033-1

journal_volume

16

pub_type

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