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Titolo:
Angiotensin-converting enzyme inhibitors and AT(1)-receptor antagonist restore nitric oxide synthase (NOS) activity and neuronal NOS expression in the adrenal glands of spontaneously hypertensive rats
Autore:
Qadri, F; Arens, T; Schwartz, EC; Hauser, W; Dominiak, P;
Indirizzi:
Med Univ Lubeck, Inst Expt & Clin Pharmacol & Toxicol, D-23538 Lubeck, Germany Med Univ Lubeck Lubeck Germany D-23538 Toxicol, D-23538 Lubeck, Germany
Titolo Testata:
JAPANESE JOURNAL OF PHARMACOLOGY
fascicolo: 4, volume: 85, anno: 2001,
pagine: 365 - 369
SICI:
0021-5198(200104)85:4<365:AEIAAA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
WISTAR-KYOTO RATS; NOREPINEPHRINE RELEASE; TYROSINE-HYDROXYLASE; CATECHOLAMINES; MODULATION; OUTFLOW; MEDULLA; ACE;
Keywords:
nitric oxide synthase; spontaneously hypertensive rat; adrenal gland; angiotensin-converting enzyme inhibitor; losartan;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Qadri, F Med Univ Lubeck, Inst Expt & Clin Pharmacol & Toxicol, Ratzeburger Allee 160, D-23538 Lubeck, Germany Med Univ Lubeck Ratzeburger Allee 160 Lubeck Germany D-23538 any
Citazione:
F. Qadri et al., "Angiotensin-converting enzyme inhibitors and AT(1)-receptor antagonist restore nitric oxide synthase (NOS) activity and neuronal NOS expression in the adrenal glands of spontaneously hypertensive rats", JPN J PHARM, 85(4), 2001, pp. 365-369

Abstract

During development of hypertension in spontaneously hypertensive (SHR) rats, the activity of adrenal nitric oxide synthase (NOS) was investigated. SHR and Wistar-Kyoto (WKY) rats were studied at different ages: 3 - 4, 7 - 8 and 12 - 13 weeks after birth. Basal NOS activity was measured by the ability of homogenate to convert [H-3]-L-arginine to [H-3]-L-citrulline. At all ages, SHR rats exhibited 50 - 60% reduction in NOS activity when compared to age-matched WKY rats. In a following study, SHR rats (12-13 weeks) were treated chronically with the angiotensin I-converting enzyme inhibitors (ACE-I) captopril or enalapril, or the AT(1)-receptor antagonist losartan (2 x 25, 10 and 60 mg/kg per day for 10 days, respectively). The total NOS activity and protein expression of NOS isoenzymes from adrenals were determined. The basal NOS activity and protein expression of neuronal NOS (nNOS) was significantly increased in treated SHR rats when compared to control rats. The isoforms endothelial NOS and inducible NOS were undetectable. We conclude that impaired NO synthesis in the adrenal glands of SHR rats may contribute to the onset and maintenance of hypertension. The upregulation of nNOS protein in the adrenal glands may be one of the mechanisms by which ACE inhibitors and AT1-receptor antagonists by restoring the NO synthesis, mediate their antihypertensive effects.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 09:22:16