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(Hypertension. 2008;51:1590.)
© 2008 American Heart Association, Inc.

Original Articles

Collecting Duct Renin Is Upregulated in Both Kidneys of 2-Kidney, 1-Clip Goldblatt Hypertensive Rats

Minolfa C. Prieto-Carrasquero; Fady T. Botros; Javier Pagan; Hiroyuki Kobori; Dale M. Seth; Dulce E. Casarini; L. Gabriel Navar

From the Department of Physiology and Hypertension and Renal Center of Excellence (M.C.P.-C., F.T.B., J.P., H.K., D.M.S., L.G.N.), Tulane University Health Sciences Center, New Orleans, La; Department of Physiology and Pharmacology (M.C.P.-C., J.P.), Ponce School of Medicine, Ponce, Puerto Rico; and Nephrology Division (D.E.C.), Department of Medicine, Federal University of Sao Paulo, Sao Paulo, Brazil.

Correspondence to Minolfa C. Prieto-Carrasquero, Tulane University HSC, Department of Physiology, SL39, 1430 Tulane Ave, New Orleans, LA 70112. E-mail mprieto{at}tulane.edu

Renin in collecting duct cells is upregulated in chronic angiotensin II–infused rats via angiotensin II type 1 receptors. To determine whether stimulation of collecting duct renin is a blood pressure–dependent effect; changes in collecting duct renin and associated parameters were assessed in both kidneys of 2-kidney, 1-clip Goldblatt hypertensive (2K1C) rats. Renal medullary tissues were used to avoid the contribution of renin from juxtaglomerular cells. Systolic blood pressure increased to 184±9 mm Hg in 2K1C rats (n=19) compared with sham rats (121±6 mm Hg; n=12). Although renin immunoreactivity markedly decreased in juxtaglomerular cells of nonclipped kidneys (NCK: 0.2±0.0 versus 1.0±0.0 relative ratio) and was augmented in clipped kidneys (CK: 1.7±1.0 versus 1.0±0.0 relative ratio), its immunoreactivity increased in cortical and medullary collecting ducts of both kidneys of 2K1C rats (CK: 2.8±1.0 cortex; 2.1±1.0 medulla; NCK: 4.6±2.0 cortex, 3.2±1.0 medulla versus 1.0±0.0 in sham kidneys). Renal medullary tissues of 2K1C rats showed greater levels of renin protein (CK: 1.4±0.2; NCK: 1.5±0.3), renin mRNA (CK: 5.8±2.0; NCK: 4.9±2.0), angiotensin I (CK: 120±18 pg/g; NCK: 129±13 pg/g versus sham: 67±6 pg/g), angiotensin II (CK: 150±32 pg/g; NCK: 123±21 pg/g versus sham: 91±12 pg/g; P<0.05), and renin activity (CK: 8.6 µg of angiotensin I per microgram of protein; NCK: 8.3 µg of angiotensin I per microgram of protein; sham: 3.4 µg of angiotensin I per microgram of protein) than sham rats. These data indicate that enhanced collecting duct renin in 2K1C rats occurs independently of blood pressure. Upregulation of distal tubular renin helps to explain how sustained intrarenal angiotensin II formation occurs even during juxtaglomerular renin suppression, thus allowing maintained effects on tubular sodium reabsorption that contribute to the hypertension.

Key Words: tubular renin • prorenin • Ang II–dependent hypertension • angiotensin II • renin mRNA • renin Western blot • renin immunostaining

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