Long-term nitric oxide synthase inhibition in rat pregnancy reduces renal kallikrein.
This study was performed to test the hypothesis that long-term nitric oxide synthase (NOS) inhibition during pregnancy may alter the predominance of the vasodilator kallikrein system. Sprague-Dawley rats were treated with the competitive inhibitor of NOS N(omega)-nitro-L-arginine (L-NNA, 50 mg. kg(-1). d(-1), dissolved in water) from days 7 to 21 of pregnancy. Rats were studied before treatment (day 5), at days 11, 17, and 21 of pregnancy (during treatment), and at postpartum days 7 and 21 (after the drug was withdrawn at delivery). Each group (n=5 to 8) had its corresponding control group (C) that received only vehicle. Additional rats were treated with N(G)-nitro-L-arginine methyl ester (L-NAME) alone or with an excess of L-arginine. At each study day, we measured blood pressure, collected urine overnight, obtained blood samples, and processed the kidneys for conventional histology and immunohistochemistry. In L-NNA rats, fetal and placental weights were reduced at days 17 and 21. Blood pressure was higher at days 17 and 21, returning to normal after L-NNA was removed. Urinary kallikrein activity was lower at days 11 and 17 (L-NNA=1147+/-213 and C=2317+/-146 nmol/16 h, P<0.001). Plasma renin activity was reduced at day 21 (L-NNA=9.6+/-2.1 and C=25.9+/-5 ng x mL(-1) x h(-1), P<0.05) and remained lower at postpartum day 7 x L-NNA rats exhibited glomerular lesions and tubular atrophy, particularly of connecting tubules that displayed reduced kallikrein staining. Tubulointerstitial infiltrating macrophages (ED1+) were also observed. Renal lesions were present as early as day 11 and persisted at day 7 postpartum. L-NAME rats exhibited similar alterations that were attenuated with an excess of L-arginine. We postulate that the reduction in renal kallikrein may contribute to the hemodynamic alterations described in this model.
Salas
S P
SP
Center for Medical Research , Department of Obstetrics and Gynecology, School of Medicine, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago. ssalas@med.puc.cl
Vuletin
J F
JF
Giacaman
A
A
Rosso
P
P
Vío
C P
CP
D000818:Animals; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D007610:Kallikreins / Q000378:metabolism*; D007668:Kidney / Q000378:metabolism* / Q000503:physiopathology; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology; D009569:Nitric Oxide / Q000037:antagonists & inhibitors* / Q000378:metabolism*; D019335:Nitroarginine / Q000494:pharmacology; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012083:Renin / Q000378:metabolism
D004791:Enzyme Inhibitors; D019335:Nitroarginine; D009569:Nitric Oxide; D007610:Kallikreins; D012083:Renin; D019331:NG-Nitroarginine Methyl Ester