茶多酚对醋氨酚致大鼠胚泡微核诱导作用的影响

作者采用细胞生物学与细胞遗传学方法，评价茶多酚（TP）对醋氨酚（Ace）致大鼠着床前胚泡遗传物质损伤的预防作用。结果表明，大鼠孕第3天igAce0．5g/kg（阳性阴道涂片为孕第0天），呈明显的胚泡微核诱导作用，胚泡微核率为122‰，具微核胚泡率为33．3％，而孕第0～3天每天igTP0．1、0．2和0．4g/kg后再给同剂量Ace，则胚泡微核率和具微核胚泡率均显著降低，分别为6．2‰、4．1‰、3．7‰和18．3％、14．3％、12．5％，并呈良好的剂量依赖关系。提示TP对Ace致大鼠胚泡遗传物质损伤有预防作用，其机制可能与抑制细胞色素P450的活性，降低Ace在体内代谢有关。     

Renoprotective effects of tea catechin in streptozotocin- induced diabetic rats

Tea catechins, a class of flavonoids, are suggested to have biological effects, possibly mediated through their antioxidative properties. Recent data indicated that tea catechins suppressed proliferative changes in glomeruli and inhibited the development of glomerulosclerosis in partially nephrectomized rats. We thus sought to determine whether tea catechins may protect against renal dysfunction in streptozotocin-induced diabetic rats. Four groups of male Sprague-Dawley rats (n=11–15 per group), with and without streptozotocin-induced diabetes, were treated with and without catechins (5 mg/day) administered in the drinking water for 12 weeks. At the end of the treatment period, 24-hour urinary albumin excretion rate (AER), serum lipid peroxides as thiobarbituric acid reactive substrates (TBARS) and blood pressure were measured. Renal glomerular volume and interstitial fibrosis were assessed morphologically. Albuminuria developed progressively in untreated diabetic rats, resulting in a mean AER of 559±124 (mean±SE) versus 63±7 μg/day/100 g body weight in non-diabetic rats at 12 weeks (P<0.001). Catechin treatment significantly reduced AER to 287±56 μg/day/100 g body weight in diabetic rats (P=0.017 versus untreated diabetic rats). Increased interstitial fibrosis in the kidney, observed in untreated diabetic rats, was completely normalized with catechin treatment. Serum levels of TBARS and blood pressure were comparable among the four groups. In conclusion, administration of tea catechin retards the progression of functional and morphological changes in the kidney of streptozotocin-induced diabetic rats.     

2007年宁夏彭阳县饮茶型氟中毒调查结果分析

目的 了解宁夏彭阳县饮茶型氟中毒的流行现状、病区分布等基础资料,为饮茶型氟中毒防治、监测、健康教育提供科学依据.方法 2007年在宁夏彭阳县抽取4个乡(镇)作为调查点,在每个调查点抽取8～12岁儿童和16岁以上成人(成人中有饮茶习惯者50人为饮茶组,无饮茶习惯者50人为对照组)作为观察对象,采用Dean法检测儿童及成人氟斑牙;用氟离子选择电极法检测饮用水、尿、茶水含氟量,用水浸-电极法检测砖茶含氟量.结果 饮茶组、对照组,儿童氟斑牙检出率分别为24.75%(99/400)、9.50%(38/400)和15.96%(71/445),饮茶组明显高于对照组(χ2=32.73,P<0.05);三种人群尿氟分别为(3.38±2.37)、(2.09±1.33)、(1.41±0.67)mg/L,饮茶组明显高于对照组(u=9.49,P<0.05).4个调查点总的茶水含氟量为(3.63±2.05)mg/L,饮用水含氟量为(1.01±0.49)mg/L.王洼镇水氟[(1.31±0.33)mg/L]超过国家生活饮用水标准(1.0mg/L),饮茶组、对照组,儿童三种人群氟斑牙检出牢及饮用水、尿、茶水、砖茶样品含氟量均高于其他3个调查点(P均<0.05).结论 宁夏彭阳县居民通过饮用砖茶引起蓄积性氟中毒,表明当地存在饮茶型氟中毒病区,其中王洼镇是饮茶型和饮水型氟中毒叠加病区.     

茶多酚对饮茶型氟中毒大鼠关节软骨氧化损伤的保护作用

目的 探讨茶多酚对饮茶型氟中毒大鼠关节软骨的氧化应激损伤的保护作用.方法 120只雄性Wistar大鼠按体质量随机分为6组:对照组、加氟组、氟+茶多酚组、氟+铝组、氟+铝+茶多酚组和砖茶组.加氟组每日饮用含氟(F-)100.00 mg/L的氟化钠(NaF)水溶液;氟+茶多酚组每日饮用含F-100 mg/L、茶多酚10.0 g/L的水溶液;氟+铝组每日饮用含F-100.00 mg/L、铝(Al3+)200.00 mg/L的水溶液;氟+铝+茶多酚组同时饮用含有上述3种物质的水溶液:砖茶组饮用砖茶沏制而成的砖茶水(F- 100.00 mg/L、Al3+215.00mg/L、9.2 g/L);对照组饮用自来水(F- 0.33 mg/L).连续饲养3个月,处死动物,检测血清中超氧化物歧化酶(SOD)、总抗氧化能力(T-AOC)、戊二醛(MDA)、一氧化氮(NO)和细胞因子白介素1β(IL-1β)、白介素6(IL-6)的水平;RT-PCR和免疫组化法检测关节软骨中诱生型一氧化氮合酶(iNOS)mRNA及蛋白表达.结果 氟 +铝+茶多酚组SOD水平[(664.009±29.589)kU/L]与加氟组、氟+销组[(625.328±27.199)、(652.282±13.926)kU/L]比较有升高趋势,但是差异无统计学意义(P均>0.05);氟+茶多酚组、氟+铝+茶多酚组、砖茶组T-AOC水平[(10.874±0.721)、(11.871±0.941)、(10.380±2.747)kU/L]与加氟组、氟+铝组[(8.849±1.887)(8.210±1.740)kU/L]比较,差异有统计学意义(P均<0.05);氟+铝+茶多酚组血清中MDA水平[(3.235±0.446)μmol/L]与加氟组、氟+铝组[(3.889±0.387)、(4.580±0.474)μmol/L]比较,差异有统计学意义(P均<0.05);氟+茶多酚组、氟+铝+茶多酚组、砖茶组血清中NO水平[(23.278±2.386),(20.643±2.623)、(24.367±6.072)μmol/L]与加氟组、氟+铝组[(32μ962±8.268)、(34.909±6.288)μmol/L]比较,差异有统计学意义(P均<0.05):加氟组、氟+销组、氟+茶多酚组、氟+铝+茶多酚组、砖茶组血清IL-1β水平分别为(4.728±0.297)、(4.412±0.229)、(4.432±0.285)、(4.516±0.351)、(4.614±0.2270)ng/L,组间比较,差异无统计学意义(F=2.314,P>0.05);氟+铝+茶多酚组、砖茶组IL-6水平[(7.231±0.596)、(7.325±0.290)ng/L]与氟+铝组[(8.256±0.635)ng/L]比较,差异有统计学意义(P均<0.05).氟+茶多酚组、氟+铝+茶多酚组、砖茶组iNOS mRNA相对表达量(0.482±0.021、0.447±0.021、0.491±0.022)与加氟组、氟+铝组(0.562±0.025、0.591±0.020)比较,差异有统计学意义(P均<0.05);对照组iNOS蛋白表达阳性细胞主要分布在关节表层,各实验组iNOS阳性细胞在关节面表层、中层均有分布.结论 茶多酚能通过清除氧自由基、提高机体总抗氧化能力、减少脂质过氧化产物等抗氧化作用减轻饮茶型氟中毒引起的大鼠氧化应激损伤,对饮茶型氟中毒有一定的保护作用.     

The influence of beverage composition on delivery of phenolic compounds from coffee and tea

Epidemiological data suggest that consumption of coffee and tea is associated with a reduced risk of several chronic and degenerative diseases including cardiovascular disorders, diabetes, obesity and neurodegenerative disorders. Both coffee and tea are a rich source of phenolic compounds including chlorogenic acids in coffee; and flavan-3-ols as well as complex theaflavins and thearubigens in tea. Coffee and tea are two of the most commonly consumed beverages in the world and thus represent a significant opportunity to positively affect disease risk and outcomes globally. Central to this opportunity is a need to better understand factors that may affect the bioavailability of specific phenolic components from coffee and tea based beverages. An overview of the phenolic composition of coffee and tea is discussed in the context of how processing and composition might influence phenolic profiles and bioavailability of individual phenolic components. Specifically, the impact of beverage formulation, the extent and type of processing and the influence of digestion on stability, bioavailability and metabolism of bioactive phenolics from tea and coffee are discussed. The impact of co-formulation with ascorbic acid and other phytochemicals are discussed as strategies to improve absorption of these health promoting phytochemicals. A better understanding of how the beverage composition impacts phenolic profiles and their bioavailability is critical to development of beverage products designed to deliver specific health benefits.     

Antioxidant potential of tea reduces arsenite induced oxidative stress in Swiss albino mice

Environmental arsenic (As) is a potent human carcinogen and groundwater As contamination is a major health concern in West Bengal, India. Oxidative stress has been one of the prime factors in As-induced carcinogenicity. Generation of reactive oxygen species (ROS), beyond the body’s endogenous antioxidant balance cause a severe imbalance of the cellular antioxidant defence mechanism. Tea, a popular beverage has excellent chemopreventive and antioxidant properties. In this study it was investigated whether these flavonoids could ameliorate the arsenite (As III) induced oxidative stress in Swiss albino mice. Bio-monitoring with comet assay elicited that the increase in genotoxicity caused by As III was counteracted by both black tea and green tea. Elevated levels of lipid peroxides and protein carbonyl by As III were effectively reduced with green as well as black tea. They also exhibited protective action against the As III induced depletion of antioxidants like catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione reductase (GR), glutathione-S-transferase (GST) and glutathione (GSH) in mice liver tissue. Thus the tea polyphenols by virtue of their antioxidant potential may be used as an effective agent to reduce the As III induced oxidative stress in Swiss albino mice.     

Relationship between tea dust exposure and lung function： a systemic literature review

Background:During the production of tea,tea dust has been viewed as a risk factor that may cause the suffering of changes of lung function and respiratory symptoms.Objective:To review whether the occupational exposure to tea dust may lead to the changes of lung function and respiratory symptoms.Methods:We searched the literatures in March 2012 in the databases of Medline,EMBase,Web of Science,Wan-Fang Database and CNKI.The search condition is"(herb OR tea)AND(lung function OR ventilatory function OR pulmonary function OR spirometric measurement)".The paper should be pubished in Enghish or Chinese,with internal or external controls.Results:Totally 17 papers were included.Both acute and chronic changes of lung function were referred.In addition,the respiratory symptoms such as cough,tightness and etc.were also reported and discussed.Conclusion:We concluded that the exposure of tea dust may lead to the changes of lung function and respiratory symptoms.     

参肽茶多酚胶囊配方优化研究

目的确定参肽茶多酚胶囊辅料的最佳配方用量。方法以淀粉、胶态二氧化硅、硬脂酸镁为考察因素,每个因素取3个水平,用L9（34）正交表安排试验,以粉体流动性为考察指标,进行正交试验。结果每1 000粒参肽茶多酚胶囊配方中添加淀粉130 g、胶态二氧化硅3 g、硬脂酸镁3 g时,粉体流动性最好。结论本研究配方合理,适于放大生产。     

茶多糖对链脲菌素诱导高血糖小鼠血糖血脂的影响

目的研究茶多糖对链脲菌素（STZ）诱导高血糖小鼠血糖血脂的影响,初步探讨茶多糖降血糖的作用机制。方法采用链尿菌素诱导高血糖小鼠模型,给药至第14d、28d测定其空腹血糖;给药至28d,测定血清胆固醇与甘油三酯,取肝脏,测定肝糖原含量。结果茶多糖能显著性降低给药第14d、28d空腹血糖及血清总胆固醇、甘油三酯含量,提高肝糖原含量。结论茶多糖对链脲菌素诱导的高血糖小鼠具有一定的降血糖降血脂的作用,其可能的作用机制是增加肝糖原含量有一定的关系。     

茶多酚对内毒素抑制人牙周膜成纤维细胞增殖的影响

目的 观察茶多酚对脂多糖(LPS)诱导下人牙周膜成纤维细胞(HPDLFs)增殖的影响.方法 采用组织块培养法培养原代HPDLFs并传代、免疫组化检测,取第5代细胞用于实验.将LPS及茶多酚分组,采用四甲基偶氮唑盐(MTT)法分别于24、48、72 h检测HPDLFs增殖活力.结果 免疫组化染色结果显示,所培养细胞的波形丝蛋白染色呈阳性表现,阳性部位位于胞质,角蛋白染色呈阴性表现.各浓度LPS组在24、48、72 h的光密度(OD)值(4 mg/L LPS组:0.323±0.007、0.345±0.010、0.437±0.007;20 mg/L LPS组:0.270±0.004、0.283±0.009、0.367±0.007; 100 mg/L LPS组:0.175±0.006、0.187±0.006、0.248±0.005;500 mg/L LPS组:0.088±0.004、0.091±0.006、0.153±0.009)与同时段空白对照组(0.306±0.008、0.333±0.007、0.399±0.007)组间比较差异均有统计学意义(均P＜0.05).100 mg/L LPS组和各浓度茶多酚组在24、48、72 h的OD值(100 mg/L LPS组:0.216±0.010、0.260±0.010、0.352±0.012; 100 mg/L LPS组+0.125 g/L茶多酚组:0.300±0.010、0.408±0.013、0.490±0.014;100 mg/L LPS组+0.25 g/L茶多酚组:0.333±0.012、0.416±0.010、0.532±0.012;100 mg/L LPS组+0.5 g/L茶多酚组:0.390±0.012、0.485±0.011、0.642±0.013;100 mg/L LPS组+1 g/L茶多酚组:0.368±0.010、0.481±0.006、0.621±0.007)与同时段空白对照组(0.450±0.012、0.528±0.011、0.687±0.010)组间比较,差异均有统计学意义(均P＜0.05);各浓度茶多酚组在24、48、72 h的OD值均低于同时段100 mg/L LPS组(均P＜0.05).结论 LPS抑制HPDLFs的增殖,茶多酚明显促进LPS诱导下HPDLFs的增殖,这提示茶多酚可应用于牙周炎的预防及治疗.