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 t he 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 s tudied before treatment (day 5), at days 11, 17, and 21 of pregnancy (durin g treatment), and at postpartum days 7 and 21 (after the drug was withdrawn at delivery).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, obt ained blood samples, and processed the kidneys for conventional histology a nd immunohistochemistry. In L-NNA rats, fetal and placental weights were re duced at days 17 and 21. Blood pressure was higher at days 17 and 21, retur ning to normal after L-NNA was removed. Urinary kallikrein activity was low er 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 . mL(-1) . h(-1), P<0.05) and remained lower at postpartum day 7. L-N NA rats exhibited glomerular lesions and tubular atrophy, particularly of c onnecting tubules that displayed reduced kallikrein staining. Tubulointerst itial infiltrating macrophages (ED1+) were also observed. Renal lesions wer e 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-arg inine. We postulate that the reduction in renal kallikrein may contribute t o the hemodynamic alterations described in this model.