低胆红素血症对机体抗氧化能力和脂质过氧化的影响及VitE的干预效果

目的 :探讨低胆红素血症对机体抗氧化能力和脂质过氧化的不良影响并观察VitE的干预效果。方法 :从体检健康人群中有意选择 4 5例胆红素水平偏高者 (≥ 15 μmol/L)和 4 0例胆红素水平偏低者 (≤ 9μmol/L)作为研究对象 ,抽空腹静脉血检测血清总抗氧化能力 (T -AOC) ,丙二醛 (MDA)及血浆氧化修饰低密度脂蛋白(Ox -LDL) ,并给低胆红素组每人每天口服VitE 10 0mg ,连续 2周 ,复测上述指标。结果 :与高胆红素组比 ,低胆红素组T -AOC明显降低 (P <0 .0 1) ,而MDA和Ox -LDL明显升高 (P <0 .0 5和P <0 .0 1) ,但低胆红素组补充VitE干预后 ,T -AOC显著升高 ,而MDA和Ox -LDL显著降低 (均P <0 .0 1) ,分别达到甚至超过了高胆红素组的相应水平。结论 :低胆红素血症可显著降低机体抗氧化能力 ,促进脂质过氧化 ,但这一不良影响可以通过补充VitE得到有效纠正。     

酵母硒对小鼠EAC瘤生长和抗氧化机能的影响

目的观察酵母硒对小鼠艾氏腹水瘤(EAC)生长及机体氧化机能的影响。方法将30只小鼠分为3组(对照组、低剂量酵母组和高剂量酵母组),酵母硒组小鼠通过灌胃的方法分别灌注酵母硒溶液,剂量分别为107μg/kg.BW.d和214μg/kg.BW.d,灌胃第13 d接种EAC,第23 d后测定小鼠肿瘤重和血清中丙二醛(M DA)含量、谷胱甘肽过氧化酶(G SH-Px)和超氧化物歧化酶(SOD)活力。结果酵母硒可抑制小鼠EAC的生长,同时显著提高血清G SH-Px活性(P<0.05),极显著提高血清SOD活力(P<0.01),高剂量酵母硒降低血清M DA水平(P<0.05)。结论酵母硒可抑制小鼠移植肿瘤的生长,显著提高机体抗氧化能力。     

苏木的药理作用及临床应用研究进展

苏木是常用的具有活血疗伤、祛瘀通经功效的中药材。近年来研究发现,苏木药理作用多样,具有抗炎、免疫抑制、抗肿瘤、抗氧化等作用。苏木在糖尿病并发症、心血管疾病、伤科疾病等疾病治疗方面应用广泛,临床前景广阔。现对苏木的药理作用和临床应用文献进行收集整理,以期为深入开展研究和临床开发应用提供参考。     

异丙酚麻醉对腹部手术患者抗氧化保护作用

目的:研究异丙酚的抗氧化保护作用.方法:32例上腹部手术患者随机分为两组,治疗组静脉推注异丙酚10 mg&#8226;kg 1&#8226;h 1,对照组吸入3%安氟醚维持麻醉,分别于麻醉前,麻醉1,2,3 h抽取血样测定6 磷酸葡萄糖脱氢酶(G 6 PD)的活性、还原型谷胱甘肽(GSH)和氧化型谷胱甘肽(GSSG)的含量,并计算GSH/GSSG比值.结果:治疗组G 6 PD活性轻度升高,GSH/GSSG比值轻度降低;对照组G 6 PD活性显著升高,GSH/GSSG比值显著降低;两组比较差异有极显著性(P＜0.01).结论:异丙酚具有显著的抗氧化活性,是一种既具有麻醉效能又具有抗氧化保护作用的麻醉药物.     

Physico-chemical analysis and antimicrobial potential of A pis dorsata,A pis mellifera and Z iziphus jujube honey samples from Pakistan

ObjectiveTo evaluate physico-chemical properties and antimicrobial potential of indigenous honey samples against different reference strains including Escherichia coli ATCC 8739, Enterobacter aerogenes ATCC 13048, Pseudomonas aeroginosa ATCC 9027, Bacillus subtilis ATCC 6633, Staphylococcus aureus ATCC 25923, Salmonella typhi ATCC 14028, Klebsiella pneumonia ATCC 13883, Aspergillus niger ATCC 16404, Rhizopus oligosporus PCSIR1, Candida albicans ATCC 14053 and Candida utilis ATCC 9950.MethodsBy using standard methods samples were evaluated for their antimicrobial properties including additive effect of starch and non-peroxidase activity, antioxidative properties (phenol contents, flavonoid contents, 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity). Prior to this evaluation, complete physico-chemical properties including pH, color, ash contents, protein contents, moisture contents, hydroxymethyl furfural contents, total sugar contents, reducing sugar and non-reducing sugar contents were analyzed.ResultsRelatively higher ash contents were found in the Siddar honey i.e. (0.590 0±0.033 6)% and small honey showed relatively higher protein contents i.e. (777.598±9.880) mg/kg. The moisture contents of tested honey samples ranged between 13.8%-16.6%, total sugar contents from 61.672%-72.420% and non-reducing sugar contents from 1.95%-3.93%. Presences of phenolic contents indicate higher antioxidant potential of these honey samples. All bacteria showed clear inhibition zones in response to tested honey samples whereas fungi and yeast showed inhibition at higher concentrations of these honey samples. For Escherichia coli, Bacillus subtilis, Salmonella typhi, Pseudomonas aeroginosa and Aspergillus niger, overall the small honey showed the higher activity than other honey samples.ConclusionPhysico-chemical analysis of honey samples confirmed good quality of honey according to the standards set by European Union Commission and Codex Alimentarius Commission. Evaluation of these honey samples confirms antimicrobial potential of particular types of honeys indigenous to Pakistan.     

过氧化氢对小鼠口腔癌发病影响的实验研究

目的检测氧化应激相关基因Nrf2、GST-π、HO1在4NQO小鼠舌癌标本中的表达水平,分析氧化损伤对4NQO诱导的小鼠口腔癌的促进作用。方法 190只8周龄雄性C57BL/6J小鼠随机分为阴性对照组、阳性对照组、6%、15%和30%过氧化氢处理组。阴性对照组不做任何处理,其余4组以0.005%4NQO诱癌16周后,分别用水(阳性对照组)和6%、15%、30%的过氧化氢涂抹小鼠舌部,每周3次,共8周。第24周末处死全部动物,取舌组织进行组织病理学分析及免疫组化染色。结果在粘膜从正常到异常增生、再到癌变的过程中,Nrf2、GST-π和HO1的表达持续升高,并且30%过氧化氢组中重度异常增生和癌变的组织中上述三者的积分光密度值显著高于阳性对照组(P0.01);6%和15%组中,GST-π的积分光密度值均显著高于阳性对照组(P0.05),Nrf2和HO1的积分光密度值与阳性对照组无统计学差异。结论过氧化氢造成的氧化损伤进一步促进了4NQO小鼠口腔癌的发展。     

Antiatherogenic properties of high-density lipoproteins from arterial plasma are attenuated as compared to their counterparts of venous origin

Background and aimsHigh-density lipoprotein (HDL) particles play atheroprotective roles by their ability to efflux cholesterol from foam cells and to protect low-density lipoproteins (LDLs) from oxidative damage in the arterial intima. We hypothesized that antioxidative properties of HDLs can be attenuated in the oxygen-rich prooxidative arterial environment, contributing to the development of atherosclerosis. To evaluate this hypothesis, we compared antioxidative activity of HDLs from arterial and venous plasmas.Methods and resultsArterial and venous blood samples were simultaneously obtained from 16 patients (age 68 ± 10 years; 75% males) presenting with ischemic or valvular heart disease. Major HDL subfractions and total HDLs were isolated by density gradient ultracentrifugation and their chemical composition and the capacity to protect LDLs from in vitro oxidation were evaluated. HDL-cholesterol, triglycerides and apolipoprotein (apo) B-100 levels were slightly but significantly reduced by −4 to −8% (p < 0.01) in the arterial vs. venous samples. Total mass of HDL subpopulations was similar and HDL subpopulations did not reveal marked compositional differences between the arterial and venous circulation. Potent antioxidative activity of the small, dense HDL3c subpopulation was significantly reduced in the particles of arterial origin vs. their counterparts from venous plasma (increase of +21% in the propagation rate of LDL oxidation, p < 0.05). Interestingly, antioxidative properties of venous HDLs were enhanced in statin-treated patients relative to untreated subjects.ConclusionAntioxidative properties of small, dense HDLs from arterial plasma are attenuated as compared to the particles of venous origin, consistent with the development of atherosclerosis in the arterial wall.     

金海宝口服液对糖尿病大鼠的降糖降脂作用及其机理研究

目的探讨金海宝口服液对糖尿病大鼠的治疗作用及其机理。方法利用静脉注射四氧嘧啶制成糖尿病大鼠模型, 给予金海宝口服液进行治疗,治疗同时观测糖尿病大鼠血糖、血脂、抗氧化功能,胰岛素、神经肽Y含量变化。结果同模型组相比,金海宝口服液(大、小剂量组)均可有效降低糖尿病大鼠血糖、血脂,改善大鼠抗氧化功能,并有效升高大鼠胰岛素水平,降低神经肽Y水平。结论金海宝口服液可有效降低糖尿病大鼠的血糖、血脂,且其降糖机制同抗氧化作用,调节神经肽Y功能相关。