Biomarkers of oxidative stress in stroke / 国际脑血管病杂志

Oxidative stress has been demonstrated to be one of the important mechanisms for brain injury. Free radicals are one of the most important products following cerebral ischemia/reperfusion and intracerebral hemorrhage. They are the important markers for evaluating the 2 types of stroke injuries. At present, some relevant biomarkers of oxidative stress, such as lipid, DNA, protein peroxidation, antioxidant enzymes, and non-enzymatic antioxidant molecules as well as inflammatory and anti-inflammatory factors, are increasingly receiving attention. This article reviews and evaluates the biomarkers of oxidative stress in stroke.

Green tea extracts protected against carbon tetrachloride-induced chronic liver damage and cirrhosis / 中华预防医学杂志

<p><b>OBJECTIVE</b>Using the carbon tetrachloride liver cirrhosis rat model, the protective effect of the green tea extractive (GTE) on the liver cirrhosis was studied.</p><p><b>METHODS</b>Male SD rats were randomly divided into three groups: normal group, GTE group and cirrhosis group. The GTE group and the cirrhosis group were injected subcutanuously 2 times/wk over 9 weeks with 40% CCl(4). In the second and the ninth week, the rats were sacrificed to measure MDA and hydroxyproline concentrations and TGF-beta(1) mRNA expression in liver tissue, as well as to conduct histological examination on various organs.</p><p><b>RESULTS</b>Compared with the cirrhosis group, the MDA and the hydroxyproline concentrations in the GTE group were significantly reduced (P < 0.05). The liver necrosis and cirrhosis were extenuated in the GTE group by means of histologic examination. The expression of the TGF-beta(1) mRNA was reduced significantly in the GTE group.</p><p><b>CONCLUSION</b>Dietary supplementation of GTE can protect against CCl(4)-induced liver damage and cirrhosis in rats.</p>

THE PREVENTIVE EFFECT OF LYCOPENE ON HYPERGLYCEMIA IN ALLOXAN-INDUCED DIABETIC RATS AND ITS MECHANISM / 营养学报

Objective: To study the preventive effect of lycopene (LP) on hyperglycemia in alloxan-induced diabetic rats, and reveal its possible mechanism.Method:Forty Sprague-Dawley rats were randomized into 5 groups:three groups of LP at doses of 5, 20, 50 mg(/kg bw ?d)for 15d, one control group and one model group of salad oil. Then alloxan (ALx) were injected intraperitoneally to the rats at dose of 150 mg/kg bw. At D4 and D14 after ALx injection, an oral glucose tolerance test (OGTT) was performed and body weight was measured, and at D14 GSP, FINS, NEFA, SOD,GSH-Px and MDA in liver were also determined . Results:Compared with the indices in group with ALX injection only,both the 2h blood glucose and GSP in group with medium-dose LP decreased significantly(P

EFFECT OF THEANINE ON DELAYING EXERCISE-INDUCED FATIGUE AND ITS MECHANISM / 营养学报

Objective: To study the effect of theanine on delaying exercise-induced fatigue, and reveal its possible mechanism.Method: Mice were randomized into 4 groups:three groups of theanine at doses of 5.6、8.4、12.6 mg/(kg bw?d),and one control group given distilled water.After 30 d,burdened swimming time,serum BUN,liver glycogen,and monoamine neurotransmitters(5-HT、DA and NE) concentrations in brain were measured.Results: Compared with the control group,both the burdened swimming time and the liver glycogen level of 8.4、12.6mg/(kg bw?d)groups increased significantly (P

EFFECT OF DIFFERENT DIETARY FAT ON GLUCOSE TOLERANCE AND INSULIN SENSITIVITY / 营养学报

Objective: To investigate the effects of different dietary fat on insulin sensitivity and glucose tolerance in rats. Methods: Fifty adult male Sprague-Dawley rats were randomly assigned to five groups and fed on basal diet (low fat diet) and four test diets containing 30.4% fat of total energy as lard, perilla oil, sunflower oil or olive oil respectively for 6 w. An oral glucose tolerance test (OGTT) was performed and blood samples were taken for measurement of serum insulin, triglyceride (TG) and total cholesterol (TC) level. Insulin sensitivity index (ISI) was calculated and epididymal fat pad was weighed. Results: In comparison with rats fed low fat, rats fed lard had a low ISI and a high serum glucose level 120 min after glucose load. The ISI in groups of sunflower oil and olive oil was markedly higher than in lard group, whereas serum glucose at 120 min was significantly lower. Serum glucose and insulin level both at 0 min and 120 min were significantly lower and ISI was higher in perilla oil group than that in lard group. Moreover, rats fed perilla oil had a low fasting glucose and a higher ISI compared with rats fed sunflower oil, olive oil and low fat respectively. Serum TC and TG were significantly lower in rats fed perilla oil than in rats fed low fat and lard respectively. Relative epididymal fat pad weight was lower in rats fed perilla oil than in rats fed lard. Conclusion: Perilla oil is effective in increasing insulin sensitivity and improving glucose metabolism in rats, and the effects of sunflower oil and olive oil are between that of perilla oil and lard. The hypoglycemic effect of perilla oil might be mediated, at least in part by reducing triglyceride level and body fat accumulation.