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Am J Physiol Renal Physiol (March 8, 2006). doi:10.1152/ajprenal.00434.2005
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Submitted on November 1, 2005
Accepted on February 17, 2006

RHO KINASE REGULATES RENAL BLOOD FLOW BY MODULATING eNOS ACTIVITY IN ISCHEMIA-REPERFUSION OF THE RAT KIDNEY

Amanda M. G. Versteilen1*, Iolente J. M. Korstjens1, Rene J. P. Musters1, A. B. Johan A Groeneveld1, and Pieter Sipkema1

1 Institute for Cardiovascular Research, VU University Medical Center, Laboratory for Physiology and Intensive Care Unit, Amsterdam, The Netherlands

* To whom correspondence should be addressed. E-mail: amg.versteilen{at}vumc.nl.

Renal ischemia-reperfusion (I/R) results in vascular dysfunction characterized by a reduced endothelium-dependent vasodilatation and subsequently impaired blood flow. In this study we investigated the role of Rho kinase in eNOS mediated regulation of renal blood flow and vasomotor tone in renal I/R. Male Wistar rats were subjected to 60 minutes bilateral clamping of the renal arteries or sham procedure. One hour before clamping, the Rho kinase inhibitor Y27632 (1 mg/kg) was intravenously infused. After I/R renal blood flow was measured using fluorescent microspheres. I/R resulted in a 62% decrease in renal blood flow. In contrast, the blood flow decrease in the group treated with the Rho kinase inhibitor (YI/R) was prevented. Endothelium-dependent vasodilatation of renal arcuate arteries to acetylcholine (Ach) was measured ex vivo in a pressure myograph. These experiments demonstrated that the in vivo treatment with the Rho kinase inhibitor prevented the decrease in NO-mediated vasodilator response. In addition, after I/R renal interlobar arteries showed a decrease in phosphorylated eNOS and vasodilator-stimulated phosphoprotein (VASP), a marker for bioactive NO, which was attenuated by in vivo Rho kinase inhibition. These findings indicate that in vivo inhibition of Rho kinase in renal I/R preserves renal blood flow by improving eNOS function.




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