黑加仑籽油降血脂功能性的研究

目的:考察黑加仑籽油在大鼠形成高血脂症过程中对血脂的影响。方法:采用40只雄性Wistar大鼠作为实验动物,随机分为4组:空白组、高脂组、高剂量组、低剂量组。测定大鼠血清中甘油三酯(TG)、总胆固醇(TC)、高密度脂蛋白胆固醇(HDL-C)、动脉硬化指数(AI)以及大鼠体重在实验前后的变化。结果:低剂量组和高剂量组大鼠的TG、TC和AI值均不同程度低于高脂组,而HDL-C却极显著高于高脂组(p<0.01)。结论:黑加仑籽油能够显著降低高血脂症大鼠血清中TG和TC的含量以及AI值,并可有效抑制HDL-C含量的降低,具有显著的降血脂功效。

沙棘油软胶囊辅助降血脂功能研究

采用16周龄雄性Wistar大鼠作为试验动物,给予高脂饲料建立高血脂症模型,同时给予不同剂量(0.15、0.3、0.9 g/(kg.d))的沙棘油软胶囊,喂养28 d后测定大鼠血清中甘油三酯(TG)、总胆固醇(TC)、高密度脂蛋白胆固醇(HDL-C)以及大鼠体重在试验前后的变化,以考察沙棘油软胶囊在大鼠形成高血脂症过程中对血脂的影响。试验结果表明,喂饲沙棘油软胶囊的低、中和高剂量组大鼠TG、TC水平显著低于高脂模型对照组(P<0.05),对大鼠HDL-C水平无显著影响(P>0.05)。沙棘油软胶囊具有辅助降血脂的功能。

金花茶叶水提物的降脂功能试验研究

用高脂饲料喂养Wistar大鼠15d,造成大鼠高血脂症模型,然后分别灌胃(ig)给予金花茶叶水提物每天0.8,0.4,0.2g/kg,以临床降血脂药物洛伐他汀(0.01g/kg)为阳性对照.灌胃实验第43天后取血清测定总胆固醇(TC)和甘油三酯(TG)、高密度脂蛋白(HDL-C)和低密度脂蛋白(LDL-C).结果金花茶叶水提物高、中剂量组均能降低高血脂症模型大鼠血清中TC、TG和LDL-C含量,效果与阳性对照药洛伐他汀相当,与高脂对照组比较,经t检验,差异均有显著性意义;高剂量组和洛伐他汀还能升高高血脂症模型大鼠血清中HDL-C含量.表明金花茶叶水提物具有明显的降血脂作用.

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.

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.