Hepatoprotective effect of lactic acid bacteria, inhibitors of β-glucuronidase production against intestinal microflora

The hepatoprotective activity of lactic acid bacteria (Lactobacillus brevis HY7401, Lactobacillus acidophilus CSG and Bifidobacterium longum HY8001), which inhibited beta-glucuronidase productivity of intestinal microflora, on t-BHP- or CCl4-induced hepatotoxicity of mice were evaluated. These oral administration of lactic acid bacteria lowered beta-glucuronidase production of intestinal microflora as well as Escherichia coli HGU-3. When lactic acid bacteria at a dose of 0.5 or 2 g (wet weight)/kg was orally administered on CCl4-induced liver injury in mice, these bacteria significantly inhibited the increase of plasma alanine transferase and aspartate transferase activities by 17-57% and 57-66% of the CCl4 control group, respectively. These lactic acid bacteria also showed the potent hepatoprotective effect against t-BHP-induced liver injury in mice. The inhibitory effects of these lactic acid bacteria were more potent than that of dimethyl diphenyl bicarboxylate (DDB), which have been used as a commercial hepatoprotective agent. Among these lactic acid bacteria, L. acidophilus CSG exhibited the most potent hepatoprotective effect. Based on these findings, we insist that an inhibitor of beta-glucuronidase production in intestine, such as lactic acid bacteria, may be hepatoprotective.     

儿童重症危重症手足口病36例临床特点及治疗分析

目的:分析重症和危重症手足口病的临床特征以指导临床诊断和治疗.方法:对2010年3月～2010年7月在我院确诊重症和危重症手足口病的患儿的临床资料进行回顾性研究.结果:重症患儿年龄最小7月,最大5.25岁.病程中均有发热、皮疹,起病发热占80.6%,手足皮疹占55.6%.痊愈22例(61.1%),好转6例(16.7%)...     

丹酚酸B对缺氧损伤心脏微血管内皮细胞细胞间粘附分子表达的影响

目的 :探讨丹参有效成分丹酚酸B在心脏微血管内皮细胞 (CMEC)缺氧 /复氧损伤中的保护作用。方法 :通过心脏微血管内皮细胞体外培养技术 ,建立缺氧预适应 (HPC)模型并给予丹酚酸B ,应用酶联免疫方法检测细胞间粘附分子 1(ICAM 1)表达。结果 :在CMEC缺氧 3h ,复氧 6h后ICAM 1表达升高 ;缺氧预适应和应用丹酚酸B对CMEC进行预处理则能有效降低CMECICAM 1的表达。结论 :丹酚酸B在CMEC缺氧 /复氧损伤中可产生与缺氧预适应类似的保护效果。     

固相法合成心肌兴奋肽及其类似物

用Boc-和Tos-基团分别保护氨基和侧链胍基,以1%交联度聚苯乙烯二苯甲氨基树脂为载体,用DCC固相法合成肽,HF断裂肽树脂键和去除侧链保护基团,粗产物经高效液相层析纯化,合成了心肌兴奋肽Phe-Met-Arg-Phe-NH_2及其类似物Phe-Pro-Arg-Phe-NH_2,并观察了此二种肽对大鼠血压和心率的影响。     

川产麦冬化学成分的研究(Ⅱ)

本文报道了由川产麦冬中所得三种成分的结构鉴定工作。其结构分别为:diosgenin-3-0[(2-o-乙酰基)-α-L-吡喃鼠李糖(1→2)][β-D-吡喃木糖(1→3]-β-D吡喃萄葡糖甙;ruscogeninl-O-[α-L-。吡喃鼠李糖(1→2)][β-D-吡喃木糖(1→3)]-β-D-吡喃萄葡糖甙及1-borneol 6-O-β-D-呋喃芹糖(1→6) β-D-吡喃萄葡糖甙。前者为首次从植物中分离得到的新化合物。     

维A类化合物4-APR抑制肿瘤侵袭、转移的作用

用体内外实验模型,研究了新维A类化合物4-乙酰胺苯基维A酸酯(4-APR)对肿瘤侵袭、转移的抑制作用。4-APR 43.3mg·kg^-1po即能减少小鼠Lewis肺癌的自发性肺转移瘤数。半体内实验证明4-APR10^-5mol·L^-1和10^-6mol·L^-1对B16-F10癌细胞的人工肺转移瘤数分别抑制67.9%和36.6%。体外实验显示,4-APR对B16-F10细胞侵袭重组基底膜的抑制率分别为54.2%和41.9%。     

桂利嗪分散片溶出度测定的研究

采用紫外分光光度法对桂利嗉分散片溶出度进行了测定。结果显示 ,本品 3批 3 min平均溶出量均超过标示量的 80 % ,提示该方法用于桂利嗪分散片的溶出度的测定快速简便、结果满意。     

Identification of a major metabolite of danshensu in rat urine and simultaneous determination of danshensu and its metabolite in plasma: application to a pharmacokinetic study in rats

Danshensu, as the effective component of Salvia miltiorrhiza (Danshen), has been widely used in clinical studies for treatment of cardiovascular diseases in China. A new metabolite, 4‐hydroxy‐3‐methoxyphenyllactic acid was isolated from the urine of rats, and its chemical structure was identified by ultraviolet (UV), Infrared Spectroscopy (IR), mass spectrometry (MS) and nuclear magnetic resonance (NMR). Furthermore, a selective and sensitive high performance liquid chromatography‐tandem mass spectrometric (HPLC‐MS/MS) method was developed for the simultaneous quantification of danshensu and its major metabolite, 4‐hydroxy‐3‐methoxyphenyllactic acid, in rat plasma after oral and intravenous administration of danshensu. The separation was performed on a Hypersil Gold C₁₈ column (150 × 2.1 mm i.d., 3.0 µm, Thermo, San jose CA, USA) with gradient elution using a mobile phase composed of methanol and water (containing 0.1% formic acid) at a flow rate of 0.2 mL/min. Linear detection responses were obtained for danshensu and 4‐hydroxy‐3‐methoxyphenyllactic acid ranging from 5 to 10000 ng/mL and 5 to 4000 ng/mL, respectively. The lower limits of quantification (LLOQs) for the two compounds were both 5 ng/mL. The intra‐and inter‐day precision (R.S.D %) were within 5.61% for the two analytes. The average recoveries of the analytes were greater than 72.43%. The method was proved to be stable during all sample storage, preparation and analytic procedures. This method was successfully applied to the pharmacokinetic studies of danshensu and 4‐hydroxy‐3‐methoxyphenyllactic acid after oral and intravenous administration of danshensu in rats.Copyright © 2014 John Wiley & Sons, Ltd.     

新药临床和审批过程中FDA与药品申办者的会议沟通机制

目的对FDA在新药临床和审批过程中与药品申办者的会议沟通机制进行介绍,为我国提供相应的参考。方法查阅FDA的相关法律法规以及一系列的指南文件。结果与结论该会议机制以其法制化、规范化、透明化的特点,确保了新药审评的效率及质量,值得我国借鉴。     

香加皮不同组分多次给药对小鼠肝毒性“量-时-毒”关系研究

目的 研究香加皮水提组分和醇提组分多次给药致小鼠肝毒性的“量-时-毒”关系.方法 取小鼠按不同时间点或不同剂量分组,观察小鼠死亡情况和毒性反应,分别于药后相应时间点检查血清肝功指标和肝脏组织ALT、AST活性,计算肝、肾脏器指数.结果 香加皮水提组分和醇提组分对小鼠多次给药肝毒性“量-时-毒”关系研究为:ALT、AST在给药后1天明显升高,以AST为更敏感,一直持续到7天.药后7天之内,水提组分在(0.78～15.0)g·kg-1剂量范围之内、醇提组分在(0.78～ 6.0)g·kg-1剂量范围之内,与正常组比较,香加皮水提和醇提组分均可造成明显的肝毒性损伤,表现ALT、AST、ALP、TBI升高,ALB降低,肝体和肾体比值有不同程度的增高,呈现明显的量效和时效关系;且醇提组分的肝毒性作用程度＞水提组分.结论 多次给小鼠一定剂量的香加皮水提组分和醇提组分均可造成明显的肝损伤,并呈现明显的肝毒性“量-时-毒”关系.