血管紧张素Ⅱ-1型受体拮抗剂在白发性高血压大鼠脑出血中的神经保护作用  被引量:1

Neuroprotective effects of angiotensin Ⅱ type 1 receptor blocker on intracerebral hemorrhage in spontaneously hypertensive rats

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作  者:罗成义[1] 郭燕舞[1] 柯以铨[1] 徐如祥[2] 河井信行[3] 田宫隆[3] 

机构地区:[1]南方医科大学珠江医院神经外科,广东神经外科研究所,广东省脑功能修复与再生重点实验室,广州510282 [2]北京军区总医院神经外科,北京100700 [3]日本香川大学医学部神经外科,7610293

出  处:《中华神经医学杂志》2009年第12期1226-1230,共5页Chinese Journal of Neuromedicine

摘  要:目的研究血管紧张素Ⅱ-1型受体拮抗剂奥美沙坦(OLM)在自发性高血压大鼠脑出血中的神经保护作用。方法自发性高血压大鼠采用完全随机数字表法分成正常组、脑出血组、治疗对照组、OLM治疗组,每组11只。正常组不做任何处理,后3组经右侧基底节注射胶原蛋白酶Ⅶ制作实验性脑出血模型。脑出血后1h,OLM组经胃管给予单剂量鼻饲OLM(10mg/kg或3mg/kg,溶入1mL羧甲基纤维素钠中),治疗对照组给予等量羧甲基纤维素钠,脑出血组不予处理。脑出血后6h,在动物清醒状态下,用无创鼠尾血压计测平均动脉血压;脑出血后24h,按改良型肢体平衡试验法进行行为学检测,干湿法测脑组织含水量,RT—PCR分析受体和靶基因mRNA表达水平。结果脑出血组平均动脉血压[(121.4±3.5)mmHg]与正常组基础血压[(120.2±3.8)mmHg]比较差异无统计学意义(P〉0.05);10mg/kgOLM组平均动脉血压[(105.6±3.5)mmHg]较脑出血组明显下降,差异有统计学意义(P〈0.05);但3mg/kgOLM组和治疗对照组没有引起血压的明显下降[分别为(120.8±3.1)mmHg,(118.6±3.9)mmHg],与脑出血组比较差异无统计学意义(P〉0.05)。3mg/kgOLM组大鼠出血侧脑组织含水量[(80.02±0.32)%]较脑出血组[(80.90±0.36)%]减少,差异有统计学意义(P〈0.05);治疗对照组大鼠出血侧脑组织含水量[(80.81±0.32)%]较脑出血组稍低,但差异无统计学意义(P〉0.05)。3mg/kgOLM组表现出更少的神经功能缺失(神经功能评分为5.03±0.71),与脑出血组(6.62±0.55)比较差异有统计学意义(P〈0.05);治疗对照组神经功能评分(6.41±0.55)与脑出血组比较差异无统计学意义(P〉0.05)。3mg/kgOLM组脑出血侧AT1R及靶基因(HO-1、COx-2、IL-6和VCAM-1)的mRNA表达均比脑出血组低,差异�Objective To investigate the neuroprotective effects ofangiotensin II type 1 receptor (AT1R) blocker olmesartan medoxomil (OLM) on intracerebral hemorrhage (1CH) in spontaneously hypertensive rats (SHRs). Methods SHRs (male, 12 weeks old; weighing 300±20 g) were randomly assigned to normal, ICH, vehicle-treatment ICH (control), OLM-treatment ICH (OLM) groups. ICH was induced via stereotaxic right basal ganglia administration ofcollagenase type Vii. One hour after ICH, the rats in OLM group were given a single oral dose of OLM (10 or 3 mg/kg solved in 1 mL sodium carboxymethylcellulose) via nasogastric feeding, and those in the control group received an equal volume of sodium carboxymethylcellulose only. Six hours after ICH induction, mean arterial blood pressure (MAP) was measured using the non-invasive method of tail-cuff plethysmography in conscious rats. Twenty-four hours after ICH induction, neurobehavior was detected by the modified limb placing test (MLPT); brain water content was measured by dry-wet method; the mRNA expression levels of receptor and target genes were analyzed by real-time PCR. Results MAP in the ICH group ([121.4±3.5] mm Hg) did not significantly differ from baseline pressure in the normal group ([120.2±3.8] mm Hg)(P〉0.05); MAP in the OLM group with 10 mg/kg ([105.6±3.1] mm Hg) was significantly lower than that in the ICH group (P〈0.05); the OLM group with 3 mg/kg ([120.8±3.1] mm Hg) and control group ([118.6±3.9] mm Hg) did not induce blood pressure reduction, and did not show significant difference as compared with the ICH group (P〉0.05). In the hemorrhagic hemisphere, brain water content in the OLM group with 3 mg/kg (80.02%±0.32%) had significant difference fi'om that in the ICH group (80.90%±0.36%, P〈 0.05); brain water content of the control group (80.81%±0.32%) was slightly lower than that of the ICH group, without significant differences (P〉0.05). The OLM group with 3 mg/kg

关 键 词:血管紧张素Ⅱ 受体拮抗剂 自发性高血压 脑出血 

分 类 号:R686[医药卫生—骨科学]

 

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