PMID- 1318053 OWN - NLM STAT- MEDLINE DCOM- 19920716 LR - 20190509 IS - 0895-7061 (Print) IS - 0895-7061 (Linking) VI - 5 IP - 4 Pt 1 DP - 1992 Apr TI - Effects of acute and chronic blockade of neutral endopeptidase with Sch 34826 on NaCl-sensitive hypertension in spontaneously hypertensive rats. PG - 210-8 AB - We have previously demonstrated that dietary NaCl supplementation is associated with increased circulating atrial natriuretic peptide (ANP) levels in Wistar-Kyoto (WKY) rats but not in spontaneously hypertensive rats (SHR), and that replacement with exogenous ANP prevents NaCl-sensitive hypertension in NaCl-sensitive SHR (SHR-S). The current study tested the hypothesis that chronic administration of the neutral endopeptidase (NEP) inhibitor Sch 34826 prevents NaCl sensitive hypertension in SHR-S by increasing endogenous ANP. Male SHR-S received Sch 34826 (90 mg/kg/day) or vehicle by gavage for 4 weeks beginning immediately before the initiation of 1% or 8% NaCl diets at age 7 weeks. Sch 34826 prevented the increase in arterial pressure in response to 8% NaCl in SHR-S, but had no effect on blood pressure in 1% NaCl fed SHR-S; plasma ANP levels were increased by 63 and 68% in the 1% and 8% NaCl groups, respectively, in response to Sch 34826. To examine the mechanism(s) of the antihypertensive effect of Sch 34826 in NaCl-supplemented SHR-S, a single dose (90 mg/kg) of Sch 34826 or vehicle was administered by gavage to SHR-S that had consumed 1% or 8% NaCl diets for 3 weeks. Sch 34826 abolished the NaCl-induced increase in blood pressure 3 h after treatment in 8% NaCl fed SHR-S, but had no effect in SHR-S fed the 1% NaCl diet. This effect was associated with increased urine volume and urinary sodium, ANP, and cyclic GMP in 8% NaCl fed SHR-S.(ABSTRACT TRUNCATED AT 250 WORDS) FAU - Jin, H AU - Jin H AD - Department of Medicine, University of Alabama, Birmingham. FAU - Mathews, C AU - Mathews C FAU - Chen, Y F AU - Chen YF FAU - Yang, R AU - Yang R FAU - Wyss, J M AU - Wyss JM FAU - Esunge, P AU - Esunge P FAU - Oparil, S AU - Oparil S LA - eng GR - HL-07457/HL/NHLBI NIH HHS/United States GR - HL-22544/HL/NHLBI NIH HHS/United States GR - HL-37722/HL/NHLBI NIH HHS/United States GR - etc. PT - Journal Article PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Am J Hypertens JT - American journal of hypertension JID - 8803676 RN - 0 (Analgesics) RN - 0 (Dioxolanes) RN - 0 (Dipeptides) RN - 0 (Protease Inhibitors) RN - 105262-04-2 (Sch 34826) RN - 451W47IQ8X (Sodium Chloride) RN - 85637-73-6 (Atrial Natriuretic Factor) RN - 9NEZ333N27 (Sodium) RN - H2D2X058MU (Cyclic GMP) SB - IM MH - Administration, Oral MH - Analgesics/*pharmacology MH - Animals MH - Atrial Natriuretic Factor/urine MH - Blood Pressure/drug effects/physiology MH - Cyclic GMP/urine MH - Dioxolanes/*pharmacology MH - Dipeptides/*pharmacology MH - Hypertension/chemically induced/*physiopathology/urine MH - Male MH - Protease Inhibitors/*pharmacology MH - Rats MH - Rats, Inbred SHR/*physiology MH - Rats, Inbred WKY MH - Sodium/urine MH - Sodium Chloride/administration & dosage/*adverse effects EDAT- 1992/04/01 00:00 MHDA- 1992/04/01 00:01 CRDT- 1992/04/01 00:00 PHST- 1992/04/01 00:00 [pubmed] PHST- 1992/04/01 00:01 [medline] PHST- 1992/04/01 00:00 [entrez] AID - 10.1093/ajh/5.4.210 [doi] PST - ppublish SO - Am J Hypertens. 1992 Apr;5(4 Pt 1):210-8. doi: 10.1093/ajh/5.4.210.