Role of the multidrug resistance protein-1 in hypertension and vascular dysfunction caused by angiotensin II

Widder, J. D., Guzik, T. J., Mueller, C. F.H., Clempus, R. E., Schmidt, H. H.H.W., Dikalov, S. I., Griendling, K. K., Jones, D. P. and Harrison, D. G. (2007) Role of the multidrug resistance protein-1 in hypertension and vascular dysfunction caused by angiotensin II. Arteriosclerosis, Thrombosis, and Vascular Biology, 27(4), pp. 762-768. (doi: 10.1161/01.ATV.0000259298.11129.a2) (PMID:17272743)

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Abstract

Objective— Human endothelial cells use the multidrug resistance protein-1 (MRP1) to export glutathione disulfide (GSSG). This can promotes thiol loss during states of increased glutathione oxidation. We investigated how MRP1 modulates blood pressure and vascular function during angiotensin II-induced hypertension. Methods and Results— Angiotensin II–induced hypertension altered vascular glutathione flux by increasing GSSG export and decreasing vascular levels of glutathione in wild-type (FVB) but not in MRP1−/− mice. Aortic endothelium-dependent vasodilatation was reduced in FVB after angiotensin II infusion, but unchanged in MRP1−/− mice. Aortic superoxide (O2·−) production and expression of several NADPH oxidase subunits were increased by angiotensin II in FVB. These effects were markedly blunted in MRP1−/− vessels. The increase in O2·− production in FVB vessels caused by angiotensin II was largely inhibited by L-NAME, suggesting eNOS uncoupling. Accordingly, aortic tetrahydrobiopterin and levels of NO were decreased by angiotensin II in FVB but were unchanged in MRP1−/−. Finally, the hypertension caused by angiotensin II was markedly blunted in MRP1−/− mice (137±4 versus 158±6 mm Hg). Conclusion— MRP1 plays a crucial role in the genesis of multiple vascular abnormalities that accompany hypertension and its presence is essential for the hypertensive response to angiotensin II.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Harrison, Professor David and Guzik, Professor Tomasz
Authors: Widder, J. D., Guzik, T. J., Mueller, C. F.H., Clempus, R. E., Schmidt, H. H.H.W., Dikalov, S. I., Griendling, K. K., Jones, D. P., and Harrison, D. G.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
Journal Name:Arteriosclerosis, Thrombosis, and Vascular Biology
Publisher:American Heart Association
ISSN:1079-5642
ISSN (Online):1524-4636
Published Online:01 February 2007

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