槲皮素对过氧化氢所致体外心肌细胞损伤的保护作用

目的:观察槲皮素对过氧化氢所致心肌细胞损伤的保护作用及其机制。方法:①实验于2004-12/2005-05在锦州医学院药理学教研室完成。选用出生1～3d的SD大鼠15只,雌雄不拘。②采用纯化培养的心肌细胞建立过氧化氢损伤模型,实验分为6组(每6孔细胞一组):正常对照组(正常细胞培养,加入等数量的培养基,不加入任何药物),10g/L二甲基亚砜组(加入10g/L二甲基亚砜),过氧化氢损伤组(加入过氧化氢200μmol/L),过氧化氢 低浓度槲皮素组(加入过氧化氢200μmol/L和槲皮素25μmol/L),过氧化氢 槲皮素中浓度组(加入过氧化氢200μmol/L和槲皮素50μmol/L),过氧化氢 槲皮素高浓度组(加入过氧化氢200μmol/L和槲皮素100μmol/L)。过氧化氢(200μmol/L)损伤时间为12h。③采用乳酸脱氢酶试剂盒测其释放量;采用黄嘌呤氧化酶法测定超氧化物歧化酶活力;硫代巴比妥酸显色法测定丙二醛含量;硝酸还原法测定一氧化氮含量;四唑盐比色法测定线粒体脱氢酶活性。④计量资料差异比较采用t检验,组间数据处理根据处理方差齐性分析结果,采用非配对t检验。结果:①心肌细胞乳酸脱氢酶活性及丙二醛含量:过氧化氢损伤组明显高于正常对照组(P<0.01),过氧化氢 高、中、低浓度槲皮素组明显低于过氧化氢损伤组(P<0.01)。②心肌细胞超氧化物歧化酶活性:过氧化氢损伤组明显低于正常对照组(P<0.01),过氧化氢 高、中浓度槲皮素组明显高于过氧化氢损伤组(P<0.01)。③线粒体脱氢酶活性:过氧化氢损伤组明显低于正常对照组(P<0.01),过氧化氢 各浓度槲皮素组明显高于过氧化氢损伤组(P<0.01)。④心肌细胞内一氧化氮含量:过氧化氢损伤组高于正常对照组(P<0.05),过氧化氢 高、中、低浓度槲皮素组低于过氧化氢损伤组(P<0.05)。结论:槲皮素具有对抗缺氧复氧损伤、明显保护心肌细胞的作用,可能与其抗氧化、抗脂质过氧化反应有关。

Protective effect of quercetin on in vitro cardiomyocyte injury induced by hydrogen peroxide

BACKGROUND: Cerebral infarction is commonly associated with blood stasis syndrome. Abnormal alternation of blood rheology is generally manifested as increased blood viscosity and hematocrit (HCT). In isometric hemodilution, a certain amount of red blood cell (RBC) is shifted by bleeding and simultaneously, isometric diluter is supplemented to reduce whole blood viscosity.OBJECTIVE: To observe the improvement of astragalus injection, the Chinese herb for qi tonification and isometric hemodilution on blood rheology in blood stasis syndrome of cerebral infarction.DESIGN: Randomized controlled experiment and case-control analysis were designed.SETTING: Union Hospital Affiliated to Tongji Medical College, Huazhong University of Science and Technology. PARTICIPANTS: In cerebral infarction group (infarction group), 64 inpatients of senile ischemic cerebral vascular disease were collected from Union Hospital Affiliated to Huazhong University of Science and Technology from March 2002 to March 2004. Al l of cases were aged over 60 years and were in conformity with the diagnostic criteria on blood stasis syndrome. According to random number table, routine treatment group (routine group) and the group of integrative therapy of Chinese and western medicine (experimental group) were divided, 32 cases in each one. 47 healthy people of similar age and diagnosed with routine physical examination were selected in normal control. METHODS: In routine group, cerebral infarction was treated with routine therapy, including extending capacity, reducing viscosity, resisting coagulation, blocking aggregation of platelet and dehydration and general symp tomatic supporting treatment. In experimental group, on basis of routine treatment, isometric hemodilution and astragalus injection, the Chinese herb for qi tonification were used. 10% of total blood amount (about 450-650 mL) was collected from vein, and colloid solution of same volume was injected intravenously. The treatment was applied once every 5 days, continuously for 3 times. Astragalus injection 50 mL mixed with physical saline 250 mL was intravenous dropped, once per day, continuously for 3 weeks. MAIN OUTCOME MEASURES: ① Comparison of indexes in bloodrheology before and after treatment in routine group and experimental group. ② Comparison of indexes in blood rheology between normal control and infarction group. RESULTS: According to intention management, 64 patients and 47 normal persons all entered result analysis. ① Comparison between infarction group and normal control: RVB, HCT and PFC (fibrinogen) were higher than normal control (3.90±0.73), (3.40±0.28) mPa·s; (46.39±6.03) %,(42.61±2.91)%; (3.25±0.75), (3.08±0.46) g/L, P < 0.01, 0.05], MTIE (de formity index of RBC) was lower than normal control (0.958±0.006, 0.961 Shen H,Lu YD.Study on quantitative messurement of immunohistochemical ±0.004, P < 0.05). ② Comparison between routine group and experimental group: Difference in some indexes presented before the treatment. After treatment, RVB, HCT and PFC in experimental grou p were all lower than routine group (3.90±0.52), (4.21±0.68) mPa·s; (43.80±3.29)%, (48.47±4.50)%; (3.31±0.60), (3.68±0.67) g/L, P < 0.01, 0.05]. CONCLUSION: Isometric hemodilution therapy and astragalus injection reduces blood viscosity, improves blood rheology and alleviates clinical svmptoms of blood stasis syndrome in senile cerebral infarction.