儿茶素和漆黄素对柠檬酸铁诱导大鼠原代肝细胞损伤的保护作用

目的　分别从中药苞蔷薇根和叶中提取获得 (+ ) 儿茶素 (CAT )和漆黄素 (FIS)两种黄酮 ,研究其对柠檬酸铁致肝细胞铁超载的药理作用。方法　原代大鼠肝细胞加入 50μmol·L- 1柠檬酸铁诱导肝细胞铁超载。致损伤前加入CAT及FIS或损伤后 2 4h ,加入CAT及FIS ,继续培养 2 4h后 ,测定培养液中的超氧化物歧化酶 (SOD )、乳酸脱氢酶(LDH )、谷草转氨酶 (AST)、谷丙转氨酶 (ALT)活性和白蛋白 (ALB)含量。培养 48h后 ,用MTT法测肝细胞的存活率。结果　在致损伤前加入CAT或FIS ,仅见CAT 5× 10 - 5mol·L- 1和FIS 5× 10 - 5 mol·L- 1对大鼠原代肝细胞的恢复作用与模型对照组相比差异有显著性 (P <0 0 5或P <0 0 1)。在致损伤后加入CAT或FIS ,可见CAT 5× 10 - 5 、5× 10 - 6 、5× 10 - 7mol·L- 1组 ,FIS 5× 10 - 5 、5× 10 - 6 、5×10 - 7mol·L- 1组均可不同程度的提高培养液中的SOD活性 ,降低LDH水平 ,抑制ALT、AST的释放 ,提高ALB的含量 ,提高培养液中肝细胞的存活率 ,与模型对照组比 ,差异有显著性 (P <0 0 1,P <0 0 5)。FIS 5× 10 - 5 mol·L- 1组与正常对照组相比 ,对于提高SOD活性、ALB含量 ,差异无显著性 (P >0 0 5)。结论　CAT、FIS对柠檬酸铁所致大鼠原代肝细胞的损伤具有保护作用     

d-儿茶素-3-O-β-D-葡萄糖苷的抗氧化作用(英文)

目的　研究粘萎陵菜含有的一种化合物 ,d 儿茶素 3 O β D 葡萄糖苷 (CGS)的保肝作用机制。方法　测定CGS在体外对NADPH 维生素C和Fe2 + 半胱氨酸系统诱发的微粒体脂质过氧化反应(丙二醛形成 )的影响 ,对黄嘌呤 黄嘌呤氧化酶系统超氧阴离子自由基产生 (还原型细胞色素C形成 )的影响 ;在体内对CCl4和乙醇诱发的小鼠肝丙二醛形成的影响。结果　体外CGS 1 0 0 μmol·L-1 能明显抑制NADPH 维生素C和Fe2 + 半胱氨酸系统诱发的大鼠脑、肝、肾微粒体丙二醛形成及黄嘌呤 黄嘌呤氧化酶系统超氧阴离子自由基的产生。在体内能抑制CCl4和乙醇诱发的小鼠肝脂质丙二醛形成。结论　CGS具有抗氧化作用     

大黄5种饮片中没食子酸和儿茶素的含量比较研究

目的:建立大黄5种饮片中没食子酸和儿茶素的含量测定方法,考察不同炮制方法对鞣质单体含量的影响。方法:采用高效液相色谱法,以梯度洗脱同时测定大黄不同炮制品中没食子酸和儿茶素的含量,选用Zorbax Eclipse XDB-C18柱(4.6 mm×250 mm,5μm);检测波长277 nm;柱温30℃;流速0.9 mL.min-1。结果:大黄酒、醋、熟、炭饮片中没食子酸的含量与生品比较均有不同程度的增加,其中以熟大黄的增加幅度最为显著,质量分数为139.3%。大黄生、酒、醋饮片中儿茶素的含量接近,而熟片和炭片中未检测到。结论:不同的炮制工艺对大黄中没食子酸和儿茶素的含量有较大的影响。     

Combined Water Extracts from Oxidation-Treated Leaves and Branches of Hovenia dulcis Has Anti-Hangover and Liver Protective Effects in Binge Alcohol Intake of Male Mice

Hovenia dulcis, known as the oriental raisin tree, is used for food supplements and traditional medicine for the liver after alcohol-related symptoms. However, little information exists about the use of its leaves and branches. In this study, we established a method to use the leaves and branches to develop anti-hangover treatment and elucidated the underlying mechanisms. Oxidation-treated leaves (OL) exhibited high antioxidant content comparable to that of the peduncles and showed an anti-hangover effect in male mice. The branch extract (BE) was enriched in the flavonoid catechin, approximately five times more than OL extract. The mixture of OL and BE (OLB) was formulated in a 2:1 ratio with frozen-dried extract weight and was tested for anti-hangover effects and protective properties against binge alcohol-induced liver injury. OLB showed better anti-hangover effect than OL. In addition to this anti-hangover effect, OLB protected the liver from oxidative/nitrosative damage induced by binge alcohol intake.     

消溃灵对实验性胃溃疡的防治作用及其毒性实验研究

消溃灵是一种以儿茶和维生素B_2为主要成分的中西药复方制剂,对醋酸型大鼠胃溃疡有显著的修复作用,使溃疡病灶明显缩小、变浅或愈合;对应激型大鼠胃溃疡亦有较好的疗效。未见毒副作用,Ames试验为阴性,亦无致畸胎作用。     

绿茶对耐甲氧西林金黄色葡萄球菌的抗菌作用及机制研究进展

泛耐药的出现,使得耐甲氧西林金黄色葡萄球菌(MRSA)感染的治疗成为临床棘手的问题。绿茶提取物对MRSA有一定的抗菌作用。本文就绿茶对MRSA感染的临床试验、与抗生素的协同抗MRSA作用、有效成分的分离分析及作用机制作一综述。     

Cancer Chemoprevention: Tea Polyphenol Induced Cellular and Molecular Responses

Genetic polymorphisms may modify the effects of environmental risk factors on cancer occurence. We have recentlylaunched a comprehensive epidemiologic project, HERPACC II (Hospital-based Epidemiologic Research Programat Aichi Cancer Center II), including both lifestyle and polymorphism data, following HERPACC-I which solelyconcentrated on lifestyle data. As of April 2001, about 3000 samples of DNA are being stored to conduct case-controlstudies. Genotyping of 46 polymorphisms has been conducted at the laboratory of the Division of Epidemiology andPrevention. Twelve case-control studies and two papers on a new PCR method, PCR-CTPP (polymerase chain reactionwith confronting two-pair primers), have been accepted for publication. Significant findings in Japanese were foundfor 1) gene-environment interaction for esophageal cancer between heavy drinking and aldehyde dehydrogenase 2(ALDH2), 2) malignant lymphoma risk with methylenetetrahydrofalate reductase (MTHFR) and methionine synthase(MS), 3) interactions between smoking and two polymorphisms, interleukin 1B (IL-1B) and myeloperoxidase (MPO)for Helicobacter pylori infection, and 4) smoking habits with dopamine receptor D2 (DRD2) and IL-1B. Furtherstudies on interactions with polymorphisms will continue to be conducted for Japanese, using larger sizes of samples.     

计算机辅助药物靶标搜寻在探索中草药有效成分机制方面的应用

应用INVDOCK软件进行计算机搜寻药物靶标。研究结果显示该软件具有实际应用潜力及在普及型计算机上可进行运算的可行性。此方法除用于研究药物或先导化合物的未知医疗靶标及毒副作用靶标外,亦可用来研究中草药的作用机理。本研究应用INVDOCK寻找数个中草药有效成分的医疗作用靶标并同已知实验结果进行比较。结果表明INVDOCK可作为探索中草药机理的有效辅助工具。     

HPLC法测定七厘散中儿茶素和表儿茶素的含量

目的建立七厘散中儿茶素和表儿茶素的含量测定方法。方法 HPLC法,采用Prevail Select C18(150 mm×4.6mm,5μm)色谱柱,柱温:35℃;以乙腈-水-磷酸(100∶900∶1)为流动相;流速:1 ml/min;检测波长:278 nm。结果儿茶素、表儿茶素线性浓度范围分别为30.08～150.4μg/ml,r=0.9999;12.24～61.20μg/ml,r=0.9999;回收率分别为99.1%和97.4%,RSD分别为1.1%和1.2%。结论本方法操作简便,测定结果准确可靠,可用于七厘散中儿茶素和表儿茶素的含量测定。     

Simultaneous Determination of Contents of Three Active Components in Jiejia Tincture by HPLC Method

The objective of the study was to determine the contents of three active components in Jiejia tincture by establishing HPLC method. Test articles were prepared by ultrasonic extraction. Separation was performed using a Kromasil C18 (250 mm × 4.6 mm, 5 µm) chromatographic column, and gradient elution was performed with acetonitrile-0.3% phosphoric acid solution as the mobile phase at a volumetric flow rate of 0.80 mL/min. The contents of catechin, baicalin and berberine in Jiejia tincture were determined at the wavelength of 276 nm and a column temperature of 30 □. The results revealed that catechin showed a good linear relationship at the range of 100∼800 µg/mL (r=0.9997); baicalin showed a good linear relationship at the range of 15∼120 µg/mL (r=0.9996), and berberine at the range of 7∼56 µg/mL (r=0.9995). Their average recovery rates were 99.67% (RSD 1.01%, n=6), 98.7% (RSD 1.93%, n=6) and 100.5% (RSD 2.88%, n=6) respectively. The study concluded that the high-performance liquid chromatography established in this study was simple, accurate and reproducible, and can also be used in the determination of catechin, baicalin and berberine contents in Jiejia tincture.