The action of melatonin to alter calcitonin gene-related peptide (CGRP)-mediated vasodilation and stimulation of adenylate cyclase activity in middle cerebral arteries of rats was investigated. Concentration-dependent dilation of the rat middle cerebral artery produced by CGRP (EC 50 of 9.4×10 −10 M) was significantly inhibited in the presence of 10 −8 M melatonin (EC 50 of 3.4×10 −9 M). In addition, CGRP (10 −7 M)-mediated increase in adenylate cyclase activity was also significantly attenuated by the receptor mediated action of melatonin. These results indicate that melatonin may interact with CGRP to regulate cerebral arterial tone.
European Journal of Pharmacology – Elsevier
Published: Mar 16, 2001
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