Participation of low-threshold Ca2+ spike in the Purkinje cells complex spike.

Abstract:

:In Purkinje cells from cerebellar slice cultures, low-threshold Ca spike (LTS) gives rise to complex bursts in the soma that resemble the complex spike induced by climbing fibers stimulation. We show that LTS is reduced by T-type and R-type Ca channel blockers (SNX-482, nickel, or mibefradil). We propose that LTS is generated by openings of T-type Ca channels (alpha-1G and/or alpha-1I subunits) and R-type Ca channels (alpha-1E subunit isoforms with a weak sensitivity to SNX-482 and to nickel). Using mibefradil we show that climbing fiber stimulation activates LTS, which contributes to the shape of the response. This Ca entry may be involved in Ca-dependent synaptic plasticity of the parallel fiber input induced by climbing fiber activation.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Cavelier P,Lohof AM,Lonchamp E,Beekenkamp H,Mariani J,Bossu JL

doi

10.1097/WNR.0b013e3282f4cb96

subject

Has Abstract

pub_date

2008-02-12 00:00:00

pages

299-303

issue

3

eissn

0959-4965

issn

1473-558X

pii

00001756-200802120-00008

journal_volume

19

pub_type

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