Jul 18, 1989

Stimulation of synaptosomal dopamine synthesis by corticotropin-releasing factor in rat striatum: role of Ca2+-dependent mechanisms

European Journal of Pharmacology
M C Olianas, P Onali

Abstract

Corticotropin-releasing factor (CRF) stimulated synaptosomal dopamine (DA) synthesis in rat striatal homogenates. The stimulatory effect of CRF was antagonized by alpha-helical CRF 9-41 and was dependent on the extracellular Ca2+ concentration, being absent after removal of Ca2+ from the incubation medium and maximal at about 1.2 mM extracellular Ca2+. The stimulation of DA synthesis by forskolin (FSK) was less sensitive to a change of extracellular Ca2+ concentration. 3-Isobutyl-1-methylxanthine potentiated the FSK effect but did not affect the response to CRF. CRF stimulation was additive to that produced by 40 mM KCl and was little affected by the calmodulin inhibitor, W-7, which markedly suppressed the veratridine-induced stimulation of DA synthesis. Polymyxin B antagonized the CRF stimulation while it had a weaker effect on FSK-stimulated DA synthesis. Tolbutamide reduced the FSK stimulation more effectively than the CRF response. CRF elicited a non-significant increase of cyclic AMP formation by striatal membranes. These results indicate that CRF stimulates striatal DA synthesis by a Ca2+-dependent mechanism possibly involving the activation of the protein kinase C pathway.

Mentioned in this Paper

Colforsin
Biochemical Pathway
Veratridine
Tissue Membrane
Neostriatum
Extracellular
Calcium
August Rats
Lentiform Nucleus Structure
Calmodulin

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