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Am J Physiol Regul Integr Comp Physiol (January 16, 2003). doi:10.1152/ajpregu.00459.2002
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Submitted on July 29, 2002
Accepted on November 28, 2002

The Androgen-Mediated Induction of the Kidney Arachidonate Hydroxylases is Associated with the Development of Hypertension

Kiyoshi Nakagawa1, Jackleen S Marji2, Michal L Schwartzman2, Michael R Waterman3, and Jorge H Capdevila4*

1 Medicine, Vanderbilt University, Nashville, TN, USA
2 Pharmacology, New York Medical College, Valhalla, New York, USA
3 Biochemistry, Vanderbilt University, Nashville, TN, USA
4 Medicine, Vanderbilt University, Nashville, TN, USA; Biochemistry, Vanderbilt University, Nashville, TN, USA

* To whom correspondence should be addressed. E-mail: jorge.capdevila{at}vanderbilt.edu.

Hypertension is a leading cause of cardiovascular, cerebral, and renal disease morbidity and mortality, and epidemiological evidence suggests a role for sex-dependent mechanisms in the pathophysiology of hypertension. We show here that treatment of rats with 5[alpha]-dihydrotestosterone increases the activity of the kidney arachidonate omega/omega-1 hydroxylase and the biosynthesis of 20-hydroxyeicosatetraenoic acid (20-HETE; 165 and 177% of control untreated male and female rats, respectively), and raises the systolic blood pressures of male and females rats by 46 and 57 mm of Hg, respectively. These androgen effects are associated with an upregulation in the kidney levels of CYP 4A8 mRNA, and a decrease in CYP 4A1 transcripts. Dissected renal microvessels, the target tissue for most of the pro-hypertensive actions of 20-HETE, show an androgen-dependent upregulation of vascular CYP 4A8 mRNA, and a 4 fold increase in 20-HETE synthase activity. We propose that androgens regulate renal function and systemic blood pressure through a combination of transcriptional and hemodynamic mechanisms that are ultimately responsible for the regulation of renovascular tone and function.




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