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Titolo:
The role of nitric oxide and the renin-angiotensin system in salt-restricted Dahl rats
Autore:
Kataoka, H; Otsuka, F; Ogura, T; Yamauchi, T; Kishida, M; Takahashi, M; Mimura, Y; Makino, H;
Indirizzi:
Okayama Univ, Sch Med, Dept Med 3, Okayama 7008558, Japan Okayama Univ Okayama Japan 7008558 d, Dept Med 3, Okayama 7008558, Japan Okayama Univ, Fac Educ, Okayama 7008558, Japan Okayama Univ Okayama Japan 7008558 niv, Fac Educ, Okayama 7008558, Japan Okayama Univ, Hlth & Med Ctr, Okayama 7008558, Japan Okayama Univ Okayama Japan 7008558 lth & Med Ctr, Okayama 7008558, Japan
Titolo Testata:
AMERICAN JOURNAL OF HYPERTENSION
fascicolo: 3, volume: 14, anno: 2001,
pagine: 276 - 285
SICI:
0895-7061(200103)14:3<276:TRONOA>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
II RECEPTOR SUBTYPES; SENSITIVE HYPERTENSION; CHRONIC INHIBITION; RELAXING FACTOR; L-ARGININE; SYNTHASE; RELEASE; KIDNEY; DAMAGE;
Keywords:
N-G-nitro-L-arginine; AT(1)-receptors; glomerular injury; blood pressure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Kataoka, H Okayama Univ, Sch Med, Dept Med 3, 2-5-1 Shikata Cho, Okayama 7008558, Japan Okayama Univ 2-5-1 Shikata Cho Okayama Japan 7008558 58, Japan
Citazione:
H. Kataoka et al., "The role of nitric oxide and the renin-angiotensin system in salt-restricted Dahl rats", AM J HYPERT, 14(3), 2001, pp. 276-285

Abstract

To elucidate the role of nitric oxide (NO) and renin angiotensin system (RAS) in the development of salt-sensitive hypertension, we investigated the presser responses and renal histologic changes after long-term inhibition of endogenous NO synthesis in Dahl-Iwai salt-sensitive (DS) and salt-resistant (DR) rats under salt-restricted conditions that exaggerate RAS activation. Male DS and DR rats (6 weeks old) were fed with a low-salt (0.3%) diet for 5 weeks, N-G-nitro-L-arginine (L-NA: dissolved in 60 mg/L deionized water), an arginine analogue acting as a NO-inhibitor, was also administered for 5 weeks. L-NA administration induced a gradual increase in systolic bloodpressure (SBP) in both strains, and the presser response in DS rats was apparently more enhanced relative to that in DR rats. Urinary nitrate plus nitrite (u-NOx) excretion was decreased by L-NA, with a significant negative correlation between SEP and u-NOx excretion in DS rats but not in DR rats. Plasma renin activity and urinary aldosterone level were significantly increased in L-NA-treated DS rats on week 5. Marked histologic changes with glomerular sclerosis and increased protein-uria and urinary N-acetyl-beta -glucosaminidase excretion were found in L-NA-treated DS rats but not DR rats. Competitive RT-PCR of mRNA extracted from the glomeruli revealed that angiotensin II type 1 receptor (AT(1)R) mRNA level was significantly lower in DSrats than in DR rats at week 2, and that L-NA administration significantlyreduced glomerular AT(1)R level of DS rats at week 5, possibly because of downregulation. Our results showed that, even under sodium restriction, thepresser response and renal injury induced by chronic NO inhibition were markedly more enhanced in DS rats than in DR rats, which indicates that depletion of NO participates in both the development of hypertension and glomerular injury in DS rats through a potential activation of RAS irrespective ofsodium loading. These data suggest that endogenous NO is an essential determinant of salt-sensitive hypertension in DS rats. (C) 2001 American Journal of Hypertension, Ltd.

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Documento generato il 03/07/20 alle ore 01:23:50