Effects of Candesartan on the Expression of Cerebral NAD(P) H Oxidase mRNA in Salt-loaded Stroke-Prone Spontaneously Hypertensive Rats
- VernacularTitle:坎地沙坦抑制盐负荷高血压大鼠大脑尼克酰胺腺嘌呤二核苷酸磷酸氧化酶基因的表达
- Author:
Yan WANG
;
Yi YU
;
Lina ZHOU
- Publication Type:Journal Article
- Keywords:
Stroke-prone spontaneously hypertensive rat;
Oxidative stress;
Cerebrum;
Stroke;
Candesartan
- From:
Chinese Journal of Hypertension
2007;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
Background Oxidative stress has been implicated in the pathogenesis of angiotensin Ⅱ(Ang Ⅱ)related hypertension.Superoxide anion,produced by NAD(P)H oxidase,plays important roles in hypertension and its complications.Ang Ⅱ infusion increases cerebral NAD(P)H oxidase activity,which is inhibited by angiotensin Ⅱ receptor blocker(ARB)candesartan and NAD(P)H oxidase inhibitor.However,the underlying mechanism of ARB in preventing hypertensive stroke is not elucidated clearly.Objective To investigate the effects of candesartan on the expression of cerebral NAD(P)H oxidase mRNA in salt-loaded stroke-prone spontaneously hypertensive rats(SHRsp).Methods Twelve-week-old salt-loaded SHRsp were treated with candesartan [1.0 mg/(kg?d)],trichlormethiazide [TCM,1.6 mg/(kg?d)] or vehicle(n=12 in each)for 2 weeks.Age-matched salt-loaded WKY rats were served as control(n=12).Blood pressure was measured every week.After two weeks,cerebrums were harvested and 24 h urine was collected.Urinary albumin was examined by ELISA.Cerebral cortex NAD(P)H oxidase subunits(p22phox,p47phox and gp91phox)mRNA expression were assayed by real-time PCR.Results The systolic blood pressure was increased significantly in salt-load SHRsp.Candesartan and TCM reduced SBP to the similar level.Urinary albumin excretion and cerebral cortex NAD(P)H oxidase subunits were markedly higher in salt-loaded SHRsp than those in salt-loaded WKY rats.Incidence of stroke was significantly reduced in candesartan treated group as compared with TCM treated SHRsp(P
