西洋参茎叶皂苷对局灶性脑缺血大鼠脑组织酸中毒及自由基代谢的影响

目的 探讨西洋参茎叶皂苷对大鼠局灶性脑缺血损伤的保护作用及其作用机制.方法 采用大鼠大脑中动脉内栓线阻断法制备局灶性脑缺血损伤模型,通过化学比色法、硫代巴比妥酸法检测西洋参茎叶皂苷对脑缺血损伤大鼠脑组织乳酸（LA）、乳酸脱氢酶（LDH）、丙二醛（MDA）、超氧化物歧化酶（SOD）四个生化指标的影响.结果 西洋参茎叶皂苷（100、50 mg/kg）可明显降低LA、MDA含量及提高LDH、SOD活性.结论 西洋参茎叶皂苷对大鼠局灶性脑缺血损伤具有保护作用,其作用机制可能与抑制酸中毒、对抗自由基和拮抗过氧化损伤有关.

Effect of Panax quinquefolium saponins from steams and leaves on acidosis and the metabolism of free radical in focal cerebral ischemia injury rats

Objective To investigate the protective effct of Panax quinquefolium saponins from steams and leaves(PQS)on focal cerebral ischemia injury in rats and its mechanisms. Methods Wistar rats were randomly divided into sham operation group,model control group,nimodipine group and two PQS groups,in which PQS of 100 and 50 mg/kg was intragastrically administered. Focal cerebral ischemia model was established by middle cerebral artery occlusion (MCAO)in rats, via string ligation of artetia carotis interna. The content of malondicldehy de(MDA) was determined by thibabituric acid ( TBA ) test, the activity of lactate dehydrogenase ( LDH ), superoxide dismutase (SOD)and the content of lactic acid(LA) were detected by chemical colorimetry test in cerebral tissues. Results PQS( 100,50mg/kg)could significantly decrease the content of LA、MDA and increase the activity of LDH、SOD. Conclusion The protective mechanism of PQS on focal cerebral ischemia injury may be related to reduce acidosis, anti-free radical and resist oxidative damage.