Deficient prolylcarboxypeptidase gene and protein expression in left ventricles of spontaneously hypertensive rats (SHR)

Deficient prolylcarboxypeptidase gene and protein expression in left ventricles of spontaneously hypertensive rats (SHR)

Author Marangoni, Rossana Anderson Google Scholar
Santos, Rosangela Aparecida Google Scholar
Piccolo, Camila Autor UNIFESP Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Abstract Prolylcarboxypeptidase (PRCP), an endothelial cell membrane serine peptidase that inactivates angiotensin II and activates pre-kallikrein, is thought to have anti-hypertensive and anti-proliferative roles in cardiovascular homeostasis. We hypothesized that PRCP function may be altered in heart tissue under conditions that predispose to left ventricle hypertrophy (LVH) in rats. We therefore used real-timePCR and western-blotting to examine the mRNA and protein expression of PRCP in the hearts of spontaneously hypertensive rats (SHR) at pre-hypertensive (5-week-old) and hypertensive (16-week-old) stages compared with age-matched hypertensive (2 kidney-1 clip; 2K-1C) rats and normotensive Wistar rats. PRCP mRNA expression was significantly reduced in hearts of 5- and 16-week-old SHR compared with age-matched Wistar controls, 2K-1C hypertensive rats and sham-operated normotensive rats. There were no significant differences in the PRCP mRNA and protein expression levels in hearts from hypertensive renovascular and sham-operated normotensive rats. Prolonged treatment of SHR with the AT(1) receptor antagonist losartan (40 mg/kg, gavage for 8 weeks) reduced the left ventricular weight/body weight ratio (LVW/BW), as well as the mRNA expression of collagen type 1, collagen type 3 and MMP9 in left ventricular tissue, without affecting PRCP gene and protein expression. Our results suggest that diminished PRCP gene and protein expression might be constitutionally involved in the SHR phenotype. in addition, since neither the development of arterial hypertension in the 2K-1C model nor its successful treatment in SHR altered PRCP gene and protein expression in heart tissue, it appears unlikely that PRCP function is regulated by the renin-angiotensin system or by afterload conditions. (C) 2014 Elsevier Inc. All rights reserved.
Keywords Heart
Kallikrein-kinin system
Renin-angiotensin system
Language English
Sponsor Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number CNPq: CNPq 504362/2009-7
Date 2014-11-01
Published in Peptides. New York: Elsevier B.V., v. 61, p. 69-74, 2014.
ISSN 0196-9781 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 69-74
Access rights Closed access
Type Article
Web of Science ID WOS:000344232700010

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