Translocation of classical PKC and cortical granule exocytosis of human oocyte in germinal vesicle and metaphase Ⅱ stage

AIM: Protein kinase C (PKC) is as a family of serine/threonine kinases that can be activated by Ca2+, phospholipid and diacylglycerol. PKC plays an important role in oocyte maturation and activation. This study was undertaken to investigate classical PKC (cPKC) in human oocyte maturation and activation. METHODS: Germinal vesicle (GV) and metaphase II (MII) stage oocytes were collected from healthy women. The expression and distribution of cPKC were investigated by immunoflourescence. MII oocytes were treated with PKC activator or inhibitor and imaged using a laser confocal scanning microscope (LCSM). RESULTS: In GV oocytes, PKCalpha, beta1 and gamma were localized to the germinal vesicles, with a weak expression in ooplasm. In MII oocytes, PKCalpha, beta1 and gamma were distributed evenly in ooplasm. After treatment with PKC activator, phorbol 12-myristate 13-acetate (PMA), cPKC translocated to the periphery of oocyte, and cortical granules (CG) exocytosis was found. When the oocytes were treated with PKC inhibitor, staurosporine, no translocation of cPKC and CG exocytosis were found. CONCLUSION: PKCalpha, beta1 and gamma exist in human oocytes and activation of these subunits could induce CG exocytosis in MII stage.     

单唾液酸四己糖神经节苷脂联合高压氧治疗急性脑梗死疗效观察

目的:观察单唾液酸四己糖神经节苷脂联合高压氧治疗急性脑梗死的疗效。方法:选择64例发病72 h内的脑梗死发病患者,在相同的基础上,将64例患者随机分成治疗组(单唾液酸四己糖神经节苷脂联合高压氧治疗)和对照组(胞二磷胆碱治疗),2周为一疗程。结果:治疗后治疗组临床有效率及血浆C反应蛋白方面均优于对照组,差异有统计学意义。结论:单唾液酸四己糖神经节苷脂联合高压氧治疗急性脑梗死疗效确切。     

桑叶提取物降血脂作用的动物试验研究

目的了解桑叶提取物降血脂效果。方法以100、200、400mg／kg．bw剂量的桑叶提取物连续给大鼠灌胃30d，次日采血测定TC、TG及HDL—C的含量。结果受试样品组大鼠血清的TC、TG含量低于模型对照组。而其HDL—C含量高于模型对照组。结论桑叶提取物具有降低血脂的作用。     

内生真菌SEF15927对截短侧耳素的微生物羟化研究

目的 研究植物内生真菌SEF15927对截短侧耳素的转化作用.方法 利用液体培养生长细胞对截短侧耳素进行生物转化.发酵液经乙酸乙酯萃取和硅胶柱层析分离获得一个羟化产物.运用质谱和核磁共振光谱鉴定结构.结果 转化产物为2-羟基截短侧耳素.结论 植物内生真菌SEF15927为一具有高转化率的截短侧耳素羟化菌株,     

Synthesis and anti-diabetic activity of （RS）-2-ethoxy-3-{4-[2-（4-trifluoro-methanesulfonyloxy-phenyl）-ethoxy]-phenyl}-propionic acid

AIM: To synthesize and study the anti-diabetic activity of (RS)-2-ethoxy-3-{4-[2-(4-trifluoromethanesulfonyloxy-phenyl)-ethoxy]-phenyl}-propionic acid (compound I). METHODS: Compound I was prepared in 6 steps, using 4-(2-hydroxy-ethyl)-phenol as the starting material. The in vitro selectivity and potency of target compound I, rosiglitazone and WY-14643 on human PPARalpha and PPARgamma were determined in reporter gene assays. In vivo, rosiglitazone and compound I were administered orally to KK(Ay) mice for 14 d. Insulin tolerance tests and oral glucose tolerance tests were performed on the 10th and 14th day of treatment, respectively. At the end of the treatment, sera were collected for biochemical analysis. RESULTS: In vitro, compound I significantly activated both PPARalpha and PPARgamma. In vivo, compound I corrected the impaired insulin and glucose tolerance of KK(Ay) mice, and produced a significant reduction in plasma triglyceride levels after 14 d of treatment. The effect produced was significant compared with the control group. CONCLUSION: Both in vitro and in vivo anti-diabetic activity studies for compound I were conducted and the data suggest that this compound is a potentially effective anti-diabetic agent.     

在裸小鼠皮肤上松节油对双氯芬酸钠的渗透动力学研究

目的以双氯芬酸钠为模型药物,研究松节油对药物的透皮吸收促透作用.方法采用氮酮、松节油对皮肤预处理的方法,通过离体裸小鼠皮肤渗透释药实验,不同时间取样,测定接受液中双氯芬酸钠的浓度,计算累积透过量、稳态流量、渗透系数和滞后时间等指标.结果松节油对双氯芬酸钠促透作用较氮酮弱,但其时滞较氮酮短(P<0.05).两种促透剂均减弱双氯芬酸钠的储库效应,其中松节油减弱程度没有氮酮大;两种促透剂对双氯芬酸钠的时滞均有延长,松节油延长更明显(P<0.05).结论松节油对双氯芬酸钠有一定的促透作用.     

多索茶碱注射液的含量测定方法改进

目的 对多索茶碱注射液含量测定方法进行改进,为该药品质量标准修订提供参考.方法 采用高效液相色谱法,色谱柱为Agela Venusil ASB C18,流动相为乙腈-水（35∶65）,流速为1.0 mL·min^-1,检测波长为273 nm,柱温为30℃.结果 多索茶碱在0.2003～0.8012μg范围内与峰面积线性关系良好（r=0.9998）;平均回收率为99.8％,RSD为0.5％（n=9）.结论 该方法经方法学验证可用于多索茶碱注射液的含量及有关物质测定.     

盐酸雷尼替丁泡腾颗粒剂的生物等效性研究

目的:测定盐酸雷尼替丁泡腾颗粒剂的生物等效性。方法:10名男性健康志愿者交叉口服盐酸雷尼替丁泡腾颗粒剂和盐酸雷尼替丁胶囊,采用HPLC法测定人血清中药物浓度进行生物等效性的研究。以ALLTMA C18为固定相,0.02mol·L-1磷酸二氢钾溶液-甲醇（70:30）为流动相,流速1.0mL·min-1,检测波长为320nm。结果:泡腾颗粒剂与胶囊的血药浓度曲线均符合二室模型。其主要药物动力学参数:Tpeak分别为（1.96±0.55）h和（2.21±0.39）h,Cmax分别为（665±213）μg·L-1和（547±181）μg·L-1,AUC分别为（3452±601）h·μg·L-1和（3053±579）h·μg·L-1。各参数经配对t-检验处理,均无显著差异（P>0.05）,泡腾颗粒剂的生物等效性经含量校正后为108％。结论:结果表明泡腾颗粒剂与胶囊剂具有生物利用等效性。     

C型钠尿肽抑制大鼠胃窦环行肌自发性收缩活动

目的：研究钠尿肽对胃动力的作用及其可能的机制．方法：用四道记录仪记录胃窦环行肌条的自发性收缩活动;利用放射免疫技术测定cGMP的产生量;利用放射自显影技术分析钠尿肽受体在胃内的分布情况．结果：钠尿肽受体在大鼠胃的不同部位均有分布,但在胃窦部最多。ANP、BNP和CNP均能抑制胃窦环行肌条的自发性收缩,其中,CNP的作用尤为明显并呈剂量依赖关系．CNP的这种抑制性作用被鸟苷酸环化酶抑制剂LY83583所削弱,而用cGMF敏感的磷酸酯酶抑制剂zaparinist预处理时CNP的抑制作用明显增加．CNP明显提高胃窦环行肌cGMP的浓度．用非选择性钾通道阻断剂TEA预处理后发现CNP对胃窦环行肌自发性收缩活动的抑制作用明显减弱．结论：钠尿肽受体在大鼠的胃窦分布最多．CNP明显抑制大鼠胃窦环行肌的自发性收缩活动．CNP对大鼠胃窦环行肌自发性收缩活动的抑制效应是通过cGMP途径实现的．钾通道也参与CNP对大鼠胃窦平滑肌的舒张过程。     

利巴韦林的安全性和有效性--Meta分析结果的系统综述

本文对利巴韦林有效性和安全性的meta分析进行了综述,在丙型肝炎患者中,与干扰素单独治疗相比,利巴韦林/干扰素联合治疗对丙型肝炎有更好的疗效,但增加了不良反应的发生率.利巴韦林治疗婴儿呼吸道合胞病毒感染的疗效尚无充分证据,需要进行更大的随机对照试验.