Vitamin D Receptor Activation Mitigates the Impact of Uremia on Endothelial Function in the 5/6 Nephrectomized Rats

Overview

Journal Int J Endocrinol

Publisher Wiley

Specialty Endocrinology

Date 2010 Feb 20

PMID 20169119

Citations 17

Authors

J Ruth Wu-Wong

William Noonan

Masaki Nakane

Kristin A Brooks

Jason A Segreti

James S Polakowski

Bryan Cox

Affiliations

Soon will be listed here.

Abstract

Endothelial dysfunction increases cardiovascular disease risk in chronic kidney disease (CKD). This study investigates whether VDR activation affects endothelial function in CKD. The 5/6 nephrectomized (NX) rats with experimental chronic renal insufficiency were treated with or without paricalcitol, a VDR activator. Thoracic aortic rings were precontracted with phenylephrine and then treated with acetylcholine or sodium nitroprusside. Uremia significantly affected aortic relaxation (-50.0 +/- 7.4% in NX rats versus -96.2 +/- 5.3% in SHAM at 30 muM acetylcholine). The endothelial-dependent relaxation was improved to -58.2 +/- 6.0%, -77.5 +/- 7.3%, and -90.5 +/- 4.0% in NX rats treated with paricalcitol at 0.021, 0.042, and 0.083 mug/kg for two weeks, respectively, while paricalcitol at 0.042 mug/kg did not affect blood pressure and heart rate. Parathyroid hormone (PTH) suppression alone did not improve endothelial function since cinacalcet suppressed PTH without affecting endothelial-dependent vasorelaxation. N-omega-nitro-L-arginine methyl ester completely abolished the effect of paricalcitol on improving endothelial function. These results demonstrate that VDR activation improves endothelial function in CKD.

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