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Angiotensin type 2 receptor-mediated phosphorylation of eNOS in the aortas of mice with 2-kidney, 1-clip hypertension. | LitMetric

Angiotensin type 2 receptor-mediated phosphorylation of eNOS in the aortas of mice with 2-kidney, 1-clip hypertension.

Hypertension

Department of Pharmacology, Faculty of Pharmaceutical Sciences and High Technology Research Center, Kobe Gakuin University, Ikawadani-cho, Nishi-ku, Kobe, Japan.

Published: May 2005

AI Article Synopsis

Article Abstract

To evaluate the role of vascular angiotensin II (Ang II) type 2 (AT2) receptor in renovascular hypertension, we investigated expressions of AT2 receptor and endothelial nitric oxide synthase (eNOS) in thoracic aortas of mice with 2-kidney, 1-clip (2K1C) hypertension. The mRNA levels of AT2 receptor in aortas, but not those of AT1 and bradykinin B2 receptors, increased 14 days but not 42 days after clipping. The contractile response to Ang II (>0.1 micromol/L) was attenuated in aortic rings excised 14 days after clipping and was restored to that of rings from sham mice by antagonists of AT2 receptor (PD123319) and B2 receptor (icatibant). The aortic levels of total eNOS, phosphorylated eNOS at Ser1177 (p-eNOS), total Akt, and phosphorylated Akt at Ser473 (p-Akt) were increased in 2K1C mice on day 14, whereas only eNOS levels were increased on day 42. The aortic cGMP levels were 20-fold greater in 2K1C mice on day 14 compared with sham mice. Administration of nicardipine for 4 days before the excision of aortas 14 days after clipping not only reduced blood pressure but also decreased the aortic levels of eNOS, p-eNOS, Akt, p-Akt, and cGMP to sham levels, whereas the administration of PD123319 or icatibant to 2K1C mice decreased p-eNOS and cGMP to sham levels without affecting blood pressure and the levels of eNOS, Akt and p-Akt. These results suggest that vascular NO production is enhanced by increased eNOS phosphorylation via the activation of AT2 receptors in the course of 2K1C hypertension.

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http://dx.doi.org/10.1161/01.HYP.0000164571.77710.19DOI Listing

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