饮茶对狗急性低氧性肺动脉高压的影响—前列腺素的作用

本实验给狗胃内灌注红茶和绿茶,观察了饮茶对狗血流动力学和急性低氧性肺动脉高压的影响,同时探讨了前列腺素在其中的作用。实验结果表明红茶显著抑制吸入低氧气体引起的肺动脉高压和血浆血栓素A_2(TXA_2)的升高,但绿茶对急性低氧性肺动脉高压和缺氧时血浆TXA_2、前列环素(PGI_2)的变化无明显影响。本文结果提示饮红茶可能有利于低氧性肺动脉高压的防治,其作用与抑制缺氧时TXA_2的合成和/或释放有关。     

茶多酚拮抗放射性颌下腺细胞凋亡的实验研究

目的 探讨茶多酚(TP)对放射性颌下腺损伤的防护作用。方法 将Wistar大鼠60只随机分为照射组(R)、茶多酚+照射组(TPR),照射前14 d至标本提取当天分别予以生理盐水和茶多酚灌胃,采用⁶⁰Co γ射线15 Gy 一次性照射大鼠头颈部。照射结束后3、6和30 d,每组各取10只大鼠颌下腺,原位末端标记法(TUNEL法)检测腺体细胞和导管细胞凋亡,免疫组织化学方法检测腺体Bcl-2﹑Bax的表达,透射电镜观察组织细胞超微结构改变。结果 茶多酚可以使照射后3﹑6和30 d 的颌下腺腺泡细胞及导管细胞凋亡指数降低,与照射组相比,差异有统计学意义(F =56.383, P <0.01);Bcl-2和Bax的表达组间差异无统计学意义;电镜下TPR组损伤较轻,细胞核凋亡改变不典型。结论 茶多酚可以对放射性颌下腺损伤起到一定防护作用,其机制可能是通过拮抗细胞凋亡实现的。     

三金茶质量标准研究

目的 建立三金茶（金樱根，菝葜，羊开口，金沙藤，积雪草，绿茶）的质量标准。方法 采用TLC法鉴别制剂中金樱根、积雪草；采用HPLC法对制剂中的积雪草苷进行定量分析，流动相：乙腈-水（23：77）；流速：1．0ml／min；检测波长：205nm。结果 积雪草苷在0．416～1.248μg范围内线性关系良好（r=0.9999）平均回收率为99．8％，RSD为1．1％。结论 本方法操作简便，结果准确、可靠，可有效控制制剂的质量。     

乌玫茶中决明子质量控制方法的研究

【目的】通过对决明子的定性、定量分析来控制乌玫茶的质量。【方法】采用薄层层析法对决明子进行定性分析；应用高效液相色谱法，采用ODS-C18色谱柱，以甲醇：0．1％磷酸（80：20）为流动相，检测波长为365nm，测定决明子中大黄素的含量。【结果】在0．1—1．0mg/L浓度范围内，线性关系良好，回归方程为Y=7757．36X-89．64。r=0．9993，平均回收率为97．95％。【结论】本法简便可靠准确，可以作为质控方法。     

Modulation of MPP<Superscript>+</Superscript> uptake by tea and some of its components in Caco-2 cells

The entry of most xeno/endobiotics into the organism is limited by their intestinal absorption. The interference of certain foods with the therapeutic efficacy of drugs or with chemical toxicity is becoming evident and growing attention is being given to these subjects. The aim of this work was to study the effect of green tea (GT) and black tea (BT), as well as some of their components, on the transport of organic cation molecules. For this purpose, ³H-MPP⁺ (radiolabeled 1-methyl-4-phenylpyridinium) was used as a model organic cation and Caco-2 cells were used as an intestinal epithelial model. Our results showed that both GT and BT significantly increased ³H-MPP⁺ absorption in these cells. Additionally, we studied the effect of epigallocatechin-3-gallate (EGCG), myricetin, caffeine, and theophylline. Whereas EGCG (2 mM) increased, myricetin (50 μM) and caffeine (1 mM) decreased, and theophylline (1 mM) had no effect on the uptake of ³H-MPP⁺ into Caco-2 cells. When GT was supplemented with caffeine or theophylline, we observed a partial loss of its effect. When BT was supplemented with EGCG, its ability to increase ³H-MPP⁺ uptake was much more pronounced than that observed with BT alone. In conclusion, this study showed that GT and BT might interfere with the absorption of the model organic cation MPP⁺ by the intestinal epithelium. Since important compounds are organic cations, the consequences of this interference may have an impact on human health. Although this constitutes only preliminary work and further studies are needed, tea should be included in the growing list of foodstuffs that have the potential to be involved in food–drug interactions.     

茶多酚防治STZ诱导的大鼠糖尿病性白内障的机制

目的探讨茶多酚对STZ诱导的大鼠糖尿病性白内障防治的作用机制。方法制备STZ糖尿病大鼠模型。成模后（血糖＞16.7mmol/L）将大鼠分为正常组、STZ诱导糖尿病组（STZ-DM）和茶多酚干预糖尿病组（TP-DM）。TP-DM组每只大鼠每日给予100mL茶多酚溶液,正常组和STZ-DM组大鼠饮用自来水,所有大鼠正常饮食。HE染色观察晶状体细胞的形态学改变;采用裂隙灯显微镜观察并记录晶状体混浊的程度;使用分光光度计测定晶状体中还原型谷胱甘肽的含量和谷胱甘肽还原酶、过氧化氢酶的活性;大鼠尾静脉取血测定血液中糖化血红蛋白、甘油三酯含量。结果HE染色可见,STZ-DM组大鼠晶状体赤道部至后囊区域内晶状体纤维细胞可见大量未被降解的细胞器,无细胞器区域缩小。建立糖尿病大鼠模型后6～9周,与STZ-DM组大鼠相比,TP-DM组大鼠晶状体混浊程度降低0.5～1个级别;13周时,还原型谷胱甘肽的含量升高45%,过氧化氢酶的活性增强174%,差别具有统计学意义(P＜0.05)。另外,TP-DM组大鼠与同时期STZ-DM组大鼠相比,体重降低(P＜0.05);TP-DM组和STZ-DM组大鼠血液中糖化血红蛋白、甘油三酯含量均高于正常对照组,差别具有统计学意义(P＜0.05)。结论晶状体纤维细胞的异常细胞器降解可能与糖尿病性白内障的发生密切相关;氧化损伤可能在糖尿病性白内障的发生中起重要作用;茶多酚溶液对糖尿病性白内障的形成有抑制作用,可能是通过茶多酚抑制晶状体的氧化损伤而延缓早期的糖尿病大鼠晶状体混浊。     

UPLC法测定银杏叶茶中总黄酮醇苷的含量

目的建立银杏叶茶中槲皮素、山柰素和异鼠李素的超高效液相色谱分析法。方法色谱柱:Thermo Scientific AcclaimTM RSLC 120C18 ODS(100mm×2.1mm,2.2μm);流动相:甲醇-4mL·L~(-1)磷酸溶液(50∶50);流速:0.3mL·min~(-1);检测波长:360nm。结果槲皮素在4.503~90.06ng、山柰素在3.586~71.72ng、异鼠李素在2.111~42.22ng范围内线性关系良好;平均回收率分别为98.95%(RSD=0.87%),98.80%(RSD=0.90%)和98.78%(RSD=1.39%)。结论该方法简单,分析速度快,准确度高,可用于快速检测银杏叶茶中总黄酮醇苷的含量。     

茶多酚片辅助化疗治疗晚期非小细胞肺癌的疗效观察

目的:观察茶多酚片辅助化疗治疗晚期非小细胞肺癌(NSCLC)的疗效。方法:将2011年2月-2013年2月收治的晚期NSCLC患者按照随机数字表法分为联合组和化疗组,各60例。化疗组实施化疗方案,联合组在此基础上加用茶多酚片。对两组患者一般资料、近期疗效、生存率和复发率、治疗后生活质量和免疫功能变化、毒性反应进行比较。结果:两组患者一般资料比较,差异无统计学意义(P>0.05);近期疗效比较,联合组优于化疗组,但差异无统计学意义(P>0.05);生存率联合组优于化疗组,复发率联合组低于化疗组,差异均有统计学意义(P>0.05);治疗后生活质量联合组优于化疗组,差异有统计学意义(P>0.05);治疗前后免疫功能变化,同组治疗前后比较,差异有统计学意义(P>0.05);两组患者毒副反应比较,差异有统计学意义(P>0.05)。结论:茶多酚片辅助化疗方案治疗晚期NSCLC安全、有效。     

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。     

Fate and distribution of kynurenic acid administered as beverage

Background

Kynurenic acid (KYNA) is a biologically active metabolite of tryptophan exerting action on several receptors located in the brain and periphery. KYNA can be synthesized endogenously or supplied in the diet. It was documented that KYNA is present in various types of food. However, its presence in beverages was not yet investigated. Here, we measured content of KYNA in tea and coffee as well as analyzed distribution and fate of intragastrically administered labelled KYNA in mice.