Electrophysiological effects of locally applied noradrenergic agents at cerebellar Purkinje neurons: receptor specificity.

Abstract:

:We have investigated the receptor subtype(s) mediating the noradrenergic inhibition of cerebellar Purkinje cell spontaneous firing rate using local application of specific agonists and antagonists, in situ, via pressure microejection. Extracellular action potentials were recorded from Purkinje neurons in anesthetized Fischer 344 rats. Timolol, a beta-receptor antagonist, did not affect norepinephrine (NE)-induced inhibition in 9 of 12 cells studied. Phentolamine, an alpha-receptor antagonist, blocked the effect of NE in 8 of 11 cells. To further determine the subtype of alpha-receptor involved, the effects of the alpha 1-antagonist prazosin and alpha 2-antagonists idazoxan and yohimbine were examined. While prazosin had no effect on NE-mediated inhibition, both idazoxan and yohimbine blocked NE effects. Idazoxan was also successful in blocking phencyclidine (PCP), an indirect noradrenergic agonist. The inhibitory action of NE upon Purkinje cell firing rate was mimicked by the selective alpha 2-agonist clonidine; this action of clonidine was blocked by idazoxan but not by timolol or prazosin. In addition, the alpha 1-adrenergic agonist phenylephrine and the beta-adrenergic agonist isoproterenol inhibited Purkinje cell firing rate. Phenylephrine effects were blocked by prazosin but not by timolol or idazoxan. Isoproterenol-induced inhibition was blocked by timolol but not phentolamine. Taken together, these studies suggest that both alpha- and beta-receptors alter Purkinje cell firing rate; the depressant action of locally applied NE, however, seems to be mediated primarily via an alpha 2-adrenergic receptor.

journal_name

Brain Res

journal_title

Brain research

authors

Parfitt KD,Freedman R,Bickford-Wimer PC

doi

10.1016/0006-8993(88)90552-5

subject

Has Abstract

pub_date

1988-10-18 00:00:00

pages

242-51

issue

2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(88)90552-5

journal_volume

462

pub_type

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