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The Journal of General Physiology, Vol 108, 315-323, Copyright © 1996 by The Rockefeller University Press
ARTICLES |
AD Bonev and MT Nelson
Department of Pharmacology, University of Vermont, Colchester 05446- 2500, USA.
The effects of vasoconstrictor-receptor (neuropeptide Y, alpha- adrenergic, serotonergic, histaminergic) stimulation on currents through ATP-sensitive potassium (KATP) channels in arterial smooth muscle cells were examined. Whole-cell KATP currents, activated by the synthetic KATP channel opener pinacidil or by the endogenous vasodilator, calcitonin gene-related peptide, which acts through protein kinase A, were measured in smooth muscle cells isolated from mesenteric arteries of rabbit. Stimulation of NPY-, alpha 1-, serotonin (5-HT2)-, and histamine (H1)-receptors inhibited KATP currents by 40- 56%. The signal transduction pathway that links these receptors to KATP channels was investigated. An inhibitor of phospholipase C (D609) and of protein kinase C (GF 109203X) reduced the inhibitory effect of these vasoconstrictors on KATP currents from 40-56% to 11-23%. Activators of protein kinase C, a diacylglycerol analogue and phorbol 12-myristate 13- acetate (PMA), inhibited KATP currents by 87.3 and 84.2%, respectively. KATP currents, activated by calcitonin gene-related peptide, were also inhibited (47-87%) by serotonin, phenylephrine, and PMA. We propose that KATP channels in these arterial myocytes are subject to dual modulation by protein kinase C (inhibition) and protein kinase A (activation).
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