赤芍总苷注射液对大鼠局灶性脑缺血的保护作用和脑血流量的影响

目的:观察赤芍总苷(TPG)注射液对大鼠局灶性脑缺血及脑缺血大鼠局部脑血流量的影响。方法:采用栓线阻断大脑中动脉闭塞法(MCAO)建立大鼠局灶性脑缺血模型,各组动物预先注射给药2 d,并于造模前0.5 h,造模后4 h、12 h再分别给药3次。造模24 h后进行行为学评分,脑组织含水量和脑梗塞面积百分比测定及进行病理学检查,并用激光多普勒血流仪检测MCAO大鼠脑血流量。结果:模型组动物较假手术组动物出现明显的缺血性神经损伤症状,脑血流量明显减少。50、100 mg/kg赤芍总苷注射液能改善脑缺血大鼠的行为学症状、减轻脑水肿、降低其脑梗塞面积和减轻缺血所致组织病理改变;100 mg/kg TPG可明显增加MCAO大鼠缺血部位的脑血流量。结论:赤芍总苷注射液对大鼠局灶性脑缺血有明显保护作用,增加脑血流量可能为治疗作用机理之一。

Effects of the total paeony glycoside on the focal cerebral ischemia in rats

AIM: To investigate the protective effects of the total paeony glycoside(TPG) on the focal cerebral ischemia and regional cerebral blood flow(rCBF) in rats. METHOD: The rat model of focal cerebral ischemia was made by middle cerebral artery occlusion(MCAO) with nylon suture.TPG was injected into every group rats once a day before 48 h,and injected before MCAO 30 min and after 4 h,12 h.After 24 h the effects of the drug were studied about neurological deficit,the water content of brain tissue,the cerebral infarcted zone,under microscopic examination,as well as rCBF on each rat with laser Doppler fiowmeter(LDF). RESULTS: The sympton of brain ischemia was obvious in model rats by contrast to the sham rats,and the model rats rCBF decreased markedly after MCAO.50 mg/kg and 100 mg/kg TPG injection could obviously promote neurological deficit,decrease the water content of brain tissue and the cerebral infarcted zone.And the pathological slices also proved its protective effect on neuron.The laser Doppler flowmeter detected result indicated that 100 mg/kg TPG inject could greatly increase MCAO rats rCBF. CONCLUSIONS: TPG injection has a marked prospective activity on rat focal brain ischemia in rats,and the increase of rCBF may be one of the protection mechanism.