Multiphasic responses of cerebellar Purkinje cells to 1S,3R-ACPD: an in vivo study.

Abstract:

:The effects of iontophoretically applied (1S,3R)-1-aminocyclopentane-1,3-dicarboxylic acid (1S,3R-ACPD), an agonist of metabotropic glutamate receptors, were examined in rat cerebellar Purkinje cells in vivo. Multibarrel electrodes were used for extracellular recordings of spontaneous single unit discharges and iontophoretic ejection of 1S,3R-ACPD. The effect of 1S,3R-ACPD depended on both the strength and the duration of the iontophoretic current. Application of the agonist with ejection currents at or slightly above the response threshold for up to 60 s resulted in an increased rate of action potential firing. With larger ejection currents of the same duration the initial increase in activity was followed by a depression and eventually a cessation of activity. In the transition phase between low frequency firing and firing arrest, Purkinje cells generated almost exclusively complex spikes. When the drug application was continued for longer durations (1-10 min) the initial response was followed by a characteristic cyclic firing pattern. These cycles consisted of alternating phases of mainly simple spike activity, predominantly complex spike activity and silent intervals. At the end of drug applications using large ejection currents, a prolonged period (on average 66 s) with almost no spiking activity was observed. This period ended with an abrupt onset of simple spike firing. These findings point to an important function of cerebellar metabotropic glutamate receptors in the regulation of Purkinje cell activity.

journal_name

Neurosci Res

journal_title

Neuroscience research

authors

Lingenhöhl K,Knöpfel T,Olpe HR

doi

10.1016/0168-0102(93)90057-w

subject

Has Abstract

pub_date

1993-12-01 00:00:00

pages

223-8

issue

3

eissn

0168-0102

issn

1872-8111

pii

0168-0102(93)90057-W

journal_volume

18

pub_type

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