The synaptic potential mediated by metabotropic glutamate receptors is not associated with a substantial elevation of cytosolic free calcium concentration in Purkinje cells.

Abstract:

:Brief tetanic stimulation of parallel fibres can evoke a slow excitatory postsynaptic potential (EPSP) in cerebellar Purkinje cells that is mediated by metabotropic glutamate receptors (mGluRs). It is likely that the receptor subtype involved is mGluR1, which couples to the production of diacylglycerol and inositol-1,4,5-trisphosphate (IP3). We therefore examined whether the mGluR-EPSP is associated with an increase in cytosolic free calcium [Ca2+]i using simultaneous Ca2+ imaging and electrophysiological recordings. An mGluR-EPSP could be evoked in all nine Purkinje cells tested. In all but one this potential was not associated with measurable changes in [Ca2+]i whereas single calcium spikes produced large Ca2+ transients. In the one Purkinje cell where [Ca2+]i was elevated, the rise was estimated to be roughly 20-fold smaller than that produced by a single Ca2+ spike.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Batchelor AM,Vranesic I,Del Principe F,Garthwaite J,Knöpfel T

doi

10.1097/00001756-199608120-00017

subject

Has Abstract

pub_date

1996-08-12 00:00:00

pages

1949-52

issue

12

eissn

0959-4965

issn

1473-558X

journal_volume

7

pub_type

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