银杏叶黄酮对高血脂大鼠血脂水平的影响

目的 :观察银杏叶黄酮的降血脂作用。方法 :用高血脂饲料喂养SD大鼠 ,制备高血脂症大鼠模型 ,银杏叶黄酮两个剂量组每日灌胃给药。以丹香降脂颗粒为阳性对照组 ,高血脂模型组给予等容量NS。于给药第 14天和第 2 8天分别取血测定血清总胆固醇 (TC)和甘油三脂 (TG)指标。结果 :银杏叶黄酮组TC、TG水平明显降低 (P <0 0 1)。结论

苦丁茶冬青不同萃取组分降血脂活性的比较

本文通过高脂饲料诱导建立大鼠高血脂模型,比较研究苦丁茶冬青中石油醚、乙酸乙酯、正丁醇和水4种萃取组分的降血脂活性。结果显示,苦丁茶冬青石油醚萃取物得率为1.83%,乙酸乙酯萃取物得率为1.65%,正丁醇萃取物得率为6.49%,水提物得率为6.97%。苦丁茶冬青不同萃取组分对高脂诱导高血脂大鼠体重增加、血清总胆固醇(TC)、甘油三酯(TG)和低密度脂蛋白胆固醇(LDL-C)升高均具有改善作用,其中石油醚萃取物能显著抑制高血脂大鼠体重增加和显著降低高血脂模型大鼠血清中TC和TG含量(p<0.05)。结果表明苦丁茶冬青不同萃取物组分均具有一定调节血脂和调节高胆固醇血症的功效,本文可为苦丁茶冬青降血脂和调节胆固醇保健品的开发提供理论依据。

Coexistence of hyperlipidemia and acute cerebral ischemia/reperfusion induces severe liver damage in a rat model

AIM:To investigate the correlation of hyperlipemia(HL) and acute cerebral ischemia/reperfusion(I/R) injury on liver damage and its mechanism.METHODS:Rats were divided into 4 groups:control,HL,I/R and HL+I/R.After the induction of HL via a high-fat diet for 18 wk,middle cerebral artery occlusion was followed by 24 h of reperfusion to capture I/R.Serum alanine transaminase(ALT) and aspartate aminotransferase(AST) were analyzed as part of liver function tests and liver damage was further assessed by histological examination.Hepatocyte apoptosis was evaluated by terminal deoxynucleotidyl transferase dUTP nick-end labeling(TUNEL) assay.The expression of genes related to apoptosis(caspase-3,bcl-2) was assayed by immunohistochemistry and Western blotting.Serum tumor necrosis factor-(TNF-),interleukin-1(IL-1) and liver mitochondrial superoxide dismutase(SOD),glutathione peroxidase(GSH-Px),malondialdehyde(MDA) and Ca 2+ levels were measured to determine inflammatory and oxidative/antioxidative status respectively.Microsomal hydroxylase activity of the cytochrome P450 2E1(CYP2E1)-containing enzyme was measured with aniline as the substrate,and CYP2E1 expression in the liver tissue and microsome was determined by immunohistochemistry and Western blotting respectively.RESULTS:HL alone induced by high-fat diet for 18 wk resulted in liver damage,indicated by histopathological analysis,and a considerable increase in serum ALT(25.13 ± 16.90 vs 9.56 ± 1.99,P < 0.01) and AST levels(18.01 ± 10.00 vs 11.33 ± 4.17,P < 0.05) compared with control.Moreover,HL alone induced hepatocyte apoptosis,which was determined by increased TUNEL-positive cells(4.47 ± 0.45 vs 1.5 ± 0.22,P < 0.01),higher caspase-3 and lower bcl-2 expression.Interestingly,compared with those in control,HL or I/R groups,massive increases of serum ALT(93.62 ± 24.00 vs 9.56 ± 1.99,25.13 ± 16.90 or 12.93 ± 6.14,P < 0.01) and AST(82.32 ± 26.92 vs 11.33 ± 4.17,18.01 ± 10.00 or 14.00 ± 6.19,P < 0.01) levels in HL+I/R group were observed suggesting severe liver damage,which was confirmed by liver histology.In addition,HL combined with I/R also caused significantly increased hepatocyte apoptosis,as evidenced by increased TUNEL-positive cells(6.20 ± 0.29 vs 1.5 ± 0.22,4.47 ± 0.45 or 1.97 ± 0.47,P < 0.01),elevated expression of caspase-3 and lower expression of bcl-2.Furthermore,when compared to HL or I/R alone,HL plus I/R enhanced serum TNF-,IL-1,liver mitochondrial MDA and Ca 2+ levels,suppressed SOD and GSH-Px in liver mitochondria,and markedly up-regulated the activity(11.76 ± 2.36 vs 4.77 ± 2.31 or 3.11 ± 1.35,P < 0.01) and expression(3.24 ± 0.38 vs 1.98 ± 0.88 or 1.72 ± 0.58,P < 0.01) of CYP2E1 in liver.CONCLUSION:The coexistence of HL and acute cerebral I/R induces severe liver damage,suggesting that cerebral ischemic stroke would exaggerate the damage of liver caused by HL.This effect is possibly due to en-hanced CYP2E1 induction which further promotes oxidative damage,inflammation and hepatocyte apoptosis.

半夏白术天麻汤化裁方治疗高脂血症的实验研究

目的:实验观察半夏白术天麻汤化裁方对高血脂模型大鼠相关指标的影响,为临床用药提供药效学依据。方法:给予大鼠高脂饲料4周,造成高血脂大鼠模型,同时给予受试药半夏白术天麻汤化裁方,测定给药过程中大鼠体重变化,及给药后高脂模型大鼠甘油三酯(TG)、胆固醇(CHOL)、高密度脂蛋白(HDL)、低密度脂蛋白(LDL)、载脂蛋白A1(apoA1)、载脂蛋白B(apoB),超氧化物歧化酶(SOD),丙二醛(MDA)的变化。结果:半夏白术天麻汤化裁方3个剂量组体重与模型组比较,高剂量组体重较同期模型对照组比较有所增加。3个剂量组对血清甘油三酯均具有显著地降低作用,高剂量组对血清CHOL,LDL水平亦具有显著地降低作用,与模型组比较具有显著性差异(P<0.05)。3个剂量组能不同程度提高血清HDL水平,但与模型组比较无显著性差异。各组大鼠血清apo A1水平均无显著性差异,各剂量组和血脂康对照组不同程度降低Apo B水平,其中高剂量组最为明显。3个剂量组不同程度提高SOD活性,降低MDA含量,其中以高剂量作用最为明显。结论:半夏白术天麻汤化裁方具有明确的改善高血脂相关指标的作用。

半夏白术天麻汤化裁方治疗高脂血症的研究

目的:实验观察半夏白术天麻汤化裁方对高血脂模型大鼠相关指标的影响,为临床用药提供药效学依据。方法:给予大鼠高脂饲料4周,造成高血脂大鼠模型,同时给予受试药半夏白术天麻汤化裁方,测定给药过程中大鼠体重变化及给药后高脂模型大鼠甘油三酯(TG)、胆固醇(CHOL)、高密度脂蛋白(HDL)、低密度脂蛋白(LDL)、载脂蛋白A1(apoA1)、载脂蛋白B(apoB),超氧化物歧化酶(SOD),丙二醛(MDA)的变化。结果:半夏白术天麻汤化裁方3个剂量组体重与模型组比较,高剂量组体重较同期模型对照组比较有所增加。半夏白术天麻汤化裁方3个剂量组对血清甘油三酯均具有显著地降低作用,高剂量组对血清CHOL,LDL水平亦具有显著地降低作用,与模型组比较具有显著性差异(P<0.05)。半夏白术天麻汤化裁方3个剂量组能不同程度提高血清HDL水平,但与模型组比较无显著性差异。各组大鼠血清apo A1水平均无显著性差异,各剂量组和血脂康对照组不同程度降低apo B水平,其中半夏白术天麻汤化裁方高剂量组最为明显。半夏白术天麻汤化裁方3个剂量组不同程度提高SOD活性,降低MDA含量,其中以高剂量作用最为明显。结论:半夏白术天麻汤化裁方具有明确的改善高血脂相关指标的作用。

Effect of Linguizhugan decoction on hyperlipidemia rats with intermittent fasting

OBJECTIVE:To explore the effect of Linguizhugan decoction on hyperlipidemia rats with caloric restriction.METHODS:The hyperlipidemia model of rat was induced by high fat diet for 8 weeks.After the model was established,26 rats were randomly divided into 4 groups:the control group(n=6),the model group(n=6),the intermittent fasting(IF) group(n= 8),and the IF and herbal medicine(IFH) group(n= 6).IF group was applied intermittent fasting every other day.The IFH group was given Linguizhugan decoction every day and intermittent fasting every other day.Blood samples were taken at the end of 16 weeks,and serum ghrelin and lipid was tested.RESULTS:Serum ghrelin in the IF group significantly increased(P<0.01).Serum ghrelin in IFH group was lower than the IF group(P<0.05),but higher than the model group(P<0.01).CONCLUSION:Linguizhugan decoction may play a part in regulation of energy and appetite in hyperlipidemia rats with IF.