(Hypertension. 1999;33:414-418.)
© 1999 American Heart Association, Inc.
Scientific Contributions |
From the Department of Physiology and Cardiovascular Research Center, Medical College of Wisconsin, Milwaukee; and the Department of Molecular Genetics (J.R.F.), University of Texas Southwestern Medical Center, Dallas.
Correspondence to Dr Richard J. Roman, Department of Physiology, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226. E-mail rroman{at}post.its.mcw.edu
AbstractThe present study examined the hypothesis that activation of protein kinase C (PKC), components of the mitogen-activated protein (MAP) kinase pathway, or both contributes to the inhibitory effects of 20-hydroxyeicosatetraenoic acid (20-HETE) on K+-channel activity and its vasoconstrictor response in renal arterioles. 20-HETE (0.1 to 50 µmol/L) dose-dependently produced a 30% increase in PKC activity and a fivefold rise in the expression of active extracellular signal-regulated kinase 1 (ERK1) and ERK2 proteins in renal microvessels. 20-HETE (0.01 to 1 µmol/L) reduced the diameter of isolated perfused renal interlobular arterioles by 33±2%. Blockade of PKC activity with an N-myristoylated PKC pseudosubstrate inhibitor (Myr-PKCi, 100 µmol/L) or calphostin C (0.5 µmol/L) had no significant effect on the vasoconstrictor response to 20-HETE. In contrast, the tyrosine kinase inhibitors genistein (30 µmol/L) and tyrphostin 25 (10 µmol/L) reduced the response to 20-HETE by 76.5±2.1% and 67.5±1.8%, respectively. A specific inhibitor of mitogen-activated extracellular signal-regulated kinase (MEK), PD98059, had no effect on the vasoconstrictor response to 20-HETE. In cell-attached patches on renal vascular smooth muscle cells, 20-HETE reduced the open state probability of a large-conductance K+ channel (from 0.0026±0.0004 to 0.0006±0.0001). The Myr-PKCi (100 µmol/L) did not alter the inhibitory effects of 20-HETE on this channel. In contrast, the tyrosine kinase inhibitor genistein (30 µmol/L) blocked the inhibitory effects of 20-HETE on the large-conductance K+ channel. These data suggest that 20-HETE activates the MAP kinase system in renal arterioles and that the activation of a tyrosine kinase, which is proximal to MEK in this cascade, contributes to the inhibitory effects of 20-HETE on K+-channel activity and its vasoconstrictor effects in the renal arterioles.
Key Words: kinase muscle, smooth, vascular arachidonic acid renal circulation cytochrome P450 potassium channels
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