Estrogen upregulates renal angiotensin II AT1 and AT2 receptors in the rat.
We studied renal AT1 and AT2 receptors in male, female, ovariectomized and ovariectomized-estrogen-treated Wistar-Hanover and Wistar-Kyoto rats. AT1 receptors and AT1A receptor mRNA predominated, with no significant differences between males and females. AT2 receptor expression was restricted in female rats to the capsule, the transition zone between outer and inner medulla, the endothelium lining the papilla, and arcuate arteries and veins. There were no AT2 receptors in male rats, while male mice express substantial numbers of estrogen-dependent AT2 receptors. Arcuate arteries and veins expressed AT1B mRNA in males and females, and AT2 mRNA in females only. AT1 receptor and AT2 receptor expression were estrogen-dependent, with increases in AT1 and AT2 receptor expression after estrogen treatment in ovariectomized rats. Estrogen treatment increased prostaglandin E2 (PGE2) and cGMP concentrations in the renal medulla, and eNOS expression in cortical arteries. In rodents, expression of renal Angiotensin II receptor types is estrogen-dependent, with significant species, strain and area differences. Our results support an important role for AT2 receptors in the regulation of renal function and in the protective effects of estrogen in the kidney.
Baiardi
Gustavo
G
Section on Pharmacology, National Institute of Mental Health, National Institutes of Health, 10 Center Drive, MSC 1514, Building 10, Room 2D-57, Bethesda, MD 20892, USA.
Macova
Miroslava
M
Armando
Ines
I
Ando
Hiromichi
H
Tyurmin
Dmitri
D
Saavedra
Juan M
JM
D000818:Animals; D001345:Autoradiography; D006152:Cyclic GMP / Q000378:metabolism; D004967:Estrogens / Q000494:pharmacology*; D005260:Female; D005786:Gene Expression Regulation; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D007668:Kidney / Q000098:blood supply / Q000187:drug effects* / Q000378:metabolism*; D008297:Male; D019001:Nitric Oxide Synthase / Q000378:metabolism; D052250:Nitric Oxide Synthase Type III; D010052:Ovariectomy; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D044140:Receptor, Angiotensin, Type 1 / Q000235:genetics / Q000378:metabolism*; D044139:Receptor, Angiotensin, Type 2 / Q000235:genetics / Q000378:metabolism*; D012727:Sex Characteristics; D015854:Up-Regulation
D004967:Estrogens; D012333:RNA, Messenger; D044140:Receptor, Angiotensin, Type 1; D044139:Receptor, Angiotensin, Type 2; D019001:Nitric Oxide Synthase; D052250:Nitric Oxide Synthase Type III; C496316:Nos3 protein, rat; D006152:Cyclic GMP