Calcitonin gene-related peptide-mediated increase in K(+)-induced [(3)H]-dopamine release from rat caudal striatal slices.

Abstract:

:The calcitonin-gene receptor peptide (alphaCGRP) receptor is present in high levels in the caudal striatum of the rat. Previous behavioural experiments have highlighted a possible correlation between alphaCGRP-mediated effects and the dopaminergic system. In this study, we examined the effect of alphaCGRP on K(+)-evoked [(3)H]-dopamine release in a slice preparation of the rat caudal striatum. The unstimulated release of [(3)H]-dopamine was not affected by alphaCGRP. However, alphaCGRP increased the release of [(3)H]-dopamine evoked by K(+) (30 mM) in a concentration-dependent manner. The stimulatory effect of alphaCGRP was blocked by the CGRP1 antagonist hCGRP(8-37) (without effect on its own). The stimulatory effect of 1 microM alphaCGRP was blocked by dizocilpine (MK-801), suggesting that excitatory transmission is involved in mediating the facilitated release. This study suggests that the peptide alphaCGRP, modulates dopamine release in the rat caudal striatum probably indirectly via glutamatergic transmission.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Maneuf YP,McKnight AT

doi

10.1016/s0304-3940(01)02056-0

keywords:

subject

Has Abstract

pub_date

2001-09-14 00:00:00

pages

73-6

issue

2-3

eissn

0304-3940

issn

1872-7972

pii

S0304394001020560

journal_volume

310

pub_type

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