D1/D5 dopamine receptors stimulate intracellular calcium release in primary cultures of neocortical and hippocampal neurons

Journal of Neurophysiology
N Lezcano, C Bergson

Abstract

D1/D5 dopamine receptors in basal ganglia, hippocampus, and cerebral cortex modulate motor, reward, and cognitive behavior. Previous work with recombinant proteins revealed that in cells primed with heterologous G(q/11)-coupled G-protein-coupled receptor (GPCR) agonists, the typically G(s)-linked D1/D5 receptors can stimulate robust release of calcium from internal stores when coexpressed with calcyon. To learn more about the intracellular signaling mechanisms underlying these D1/D5 receptor regulated behaviors, we explored the possibility that endogenous receptors stimulate internal release of calcium in neurons. We have identified a population of neurons in primary cultures of hippocampus and neocortex that respond to D1/D5 dopamine receptor agonists with a marked increase in intracellular calcium (Ca) levels. The D1/D5 receptor stimulated responses occurred in the absence of extracellular Ca(2+) indicating the rises in Ca involve release from internal stores. In addition, the responses were blocked by D1/D5 receptor antagonists. Further, the D1/D5 agonist-evoked responses were state dependent, requiring priming with agonists of G(q/11)-coupled glutamate, serotonin, muscarinic, and adrenergic receptors or with high external K...Continue Reading

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Citations

Dec 3, 2008·Molecular Pharmacology·Asha SahuAshiwel S Undieh
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