Effects of over-expressing resistin on glucose and lipid metabolism in mice

Resistin, a newly discovered peptide hormone mainly secreted by adipose tissues, is present at high levels in serum of obese mice and may be a potential link between obesity and insulin resistance in rodents. However, some studies of rat and mouse models have associated insulin resistance and obesity with decreased resistin expression. In humans, no relationship between resistin level and insulin resistance or adiposity was observed. This suggests that additional studies are necessary to determine the specific role of resistin in the regulation of energy metabolism and adipogenesis. In the present study, we investigated the effect of resistin in vivo on glucose and lipid metabolism by over-expressing resistin in mice by intramuscular injection of a recombinant eukaryotic expression vector pcDNA3.1-Retn encoding porcine resistin gene. After injection, serum resistin and serum glucose (GLU) levels were significantly increased in the pcDNA3.1-Retn-treated mice; there was an obvious difference in total cholesterol (TC) level between the experiment and the control groups on Day 30. In pcDNA3.1-Retn-treated mice, both free fatty acid (FFA) and high density lipoprotein (HDL) cholesterol levels were markedly lower than those of control, whereas HDL cholesterol and triglyceride (TG) levels did not differ between the two groups. Furthermore, lipase activity was expressly lower on Day 20. Our data suggest that resistin over-expressed in mice might be responsible for insulin resistance and parameters related to glucose and lipid metabolism were changed accordingly.     

Resistin levels of serum and follicular fluid in non-obese patients with polycystic ovary syndrome during IVF cycles

INTRODUCTION Polycystic ovary syndrome (PCOS) is a leading cause of anovulatory infertility and affects 5%~10% of reproductive age women (Dunaif, 1997). It is characterized by hyperandrogenemia and chronic anovulation and is associated with insulin resistance, obesity and increased risk for type 2 diabetes (Kno- chenhauer et al., 1998). Insulin resistance is thought to play an important role in aetiology of PCOS (Chang et al., 1983; Shoupe et al., 1983). In vitro and in vivo studies …     

运动对糖耐量减低患者血清抵抗素、脂联素和胰岛素敏感性的影响

探讨运动对糖耐量减低（IGT）患者血清抵抗素、脂联素和胰岛素敏感性的影响．56名中老年IGT患者随机分为3组：对照组（18例）、健步走组（19例）、健步走＋抗阻力组（19例）,健步走组采取24周健步走运动处方锻炼．健步走＋抗阻力组采取健步走和抗阻力运动相结合的运动处方锻炼,运动干预前后采用放射免疫法测定血清胰岛素、抵抗素、血清脂联素。计算胰岛素抵抗指数（HOMA-IR）．健步走组、健步走＋抗阻力组的抵抗素、脂联素和HOMA-IR与对照组相比均有极其显著性差异（P〈0．01）;健步走组与健步走＋抗阻力组的抵抗素和HOMA-IR与健步走组相比无显著性差异（P〉0．05）,脂联素比较有极其显著性差异（P〈0．01）．运动可改善IGT患者的代谢水平．健步走＋抗阻力运动对脂联素的影响较单纯健步走更为明显．     

Resistin levels of serum and follicular fluid in non-obese patients with polycystic ovary syndrome during IVF cycles

Objectives: To measure serum and follicular resistin, steroids hormone levels in women with PCOS (polycystic ovary syndrome) (BMI (body mass index)<25 kg/m²), to assess possible correlations of resistin to hormonal and metabolic parameters and to analyze the clinical outcomes of in vitro fertilization-embryo transfer (IVF-ET) in women with PCOS and tubal infertility. Study design: We analyzed the clinical outcomes of IVF-ET in women with PCOS (BMI<25 kg/m²) and tubal infertility during the years 2002 to 2004 and compared the serum and follicular fluid resistin levels, estradiol (E₂), progesterone (P), testosterone (T) levels in 20 PCOS and 20 healthy, age-matched women without PCOS during IVF-stimulated cycles. The correlations between the resistin levels and the outcomes of IVF-ET were evaluated. Results: No significant differences in resistin levels of either serum or follicular fluid between PCOS and control group were found. However, resistin levels in serum were higher than that in follicular fluid in both groups. Multiple regression analysis showed that resistin levels in serum did not correlate with BMI, estradiol, LH (luteinizing hormone) and insulin level in fasting blood. No significant correlations were found between follicular fluid reisistin levels and fertilization rate, implantation rate, clinical pregnancy rate or early miscarriage rate in both PCOS and control groups. Conclusion: Our results show that resistin does not have correlation with the hormonal and metabolic parameters as well as the outcomes of IVF. These data suggest that resistin is unlikely to be a local determinant factor in steroidogenesis and growth and maturation of oocytes during IVF-ET in lean women with PCOS.     

乳腺癌MiR-34a启动子荧光素酶载体构建及活性测定

提取人乳腺癌细胞（MCF7）基因组DNA,应用PCR扩增miR-34a启动子序列,将其克隆连接到荧光素酶报告质粒p GL3-Basic中;瞬时转染人肾上皮细胞（293T）,检测荧光素酶活性。成功构建了p GL3-miR34a-promoter报告基因载体并对其测序验证,结果表明启动子序列正确,载体具有较高的启动子活性。     

碘缺乏传代大鼠下丘脑弓状核形态学研究

实验采用wistar大鼠18只,分为低磺组和正常组,于40日龄处死,取含弓状核的脑片,右侧做光镜观察,运用体视学原理,对弓状核神经元进行测量和计算。左侧做电镜观察。结果显示:低碘组弓状核神经元数密度增加,细胞体积减小,细胞核与细胞质平均体积减小。超微结构变化为:暗细胞增多,细胞内细胞器变性,次级溶酶体增多。在加碘组无上述变化,本结果提示了机体在低碘和甲状腺功能低下时,神经内分泌系统可能受到影响;其细胞的结构发生改变,必然影响细胞的功能。     

我国一鸟疟原虫新记录——嗜核疟原虫的描述

在海南岛保亭县猎捕2隻白腰文鸟(Lonchura striata),它们体内自然感染了一种小型疟原虫,根据其形态特征,鉴定为嗜核疟原虫。     

抗老灵BG对老龄前后小白鼠肝脏的影响

应用纯中药合剂“抗老灵BG”对老年前及老年小白鼠进行抗衰老疗效观察,在光镜及及电镜下进行各年龄组小白鼠肝脏形态结构的比较,发现用药老年前及老年组小白鼠肝细胞排列规则、大小一致,胞核圆形、核膜规整,胞浆内有多量糖元颗粒,未见脂褐素沉积及枯否氏细胞增生,其形态特点与青年组小白鼠相似,明显优于同龄生理盐水对照组小白鼠,从而证实“抗老灵BG”具有延缓肝脏衰老之功效。     

LPS刺激对鸡HD11细胞RIPK2基因甲基化的影响及调控

为分析LPS刺激前后对RIPK2基因甲基化的影响,试验采用凝胶电泳、亚硫酸氢盐、双荧光素酶报告系统和qRT-PCR方法分析LPS刺激前后RIPK2基因的甲基化模式及甲基化相关试剂对鸡RIPK2启动子活性及表达水平影响。结果表明：LPS刺激后鸡RIPK2基因甲基化水平从53.8%下降至15.4%;5-氮杂胞苷显著性提高鸡RIPK2启动子活性,促进基因表达;而CpG甲基转移酶M. SssI显著性抑制鸡RIPK2启动子活性,抑制基因表达。研究结果对提高家禽免疫和控制过度性炎症反应具有十分重要的现实意义。     

Cytotoxicity of epigallocatechin-3-gallate to LNCaP cells in the presence of Cu^2＋

Epigallocatechin-3-gallate (EGCG) has shown remarkably anti-cancer activity, with its bioactivity being related to reactive conditions, such as pH and metal ions. The present study investigated the degradation of EGCG and its effect on prostate cancer cell in the presence of Cu2 . EGCG was incubated with prostate cancer cells,     

萤火虫萤光素酶基因转化花叶芋及表达的研究

将萤火虫萤光素酶基因重组到质粒pBR325中,通过“三亲交配”和同源重组,将萤光素酶基因整合到Ti质粒pGV3850:1103。通过改良的叶盘转化法,用萤光素酶基因转化单子叶植物花叶芋,获得转基因植株。对再生植株的胭脂碱测定、新霉素磷酸转移酶分析、DNA点杂交、萤光素酶基因活性测定,证明萤光素酶基因已转化到花叶芋中并进行了表达。     

A food-grade industrial arming yeast expressing β-1,3-1,4-glucanase with enhanced thermal stability

The aim of this work was to construct a novel food-grade industrial arming yeast displaying β-1,3-1,4-glucanase and to evaluate the thermal stability of the glucanase for practical application. For this purpose, a bi-directional vector containing galactokinase (GAL1) and phosphoglycerate kinase 1 (PGK1) promoters in different orientations was constructed. The β-1,3-1,4-glucanase gene from Bacillus subtilis was fused to α-agglutinin and expressed under the control of the GAL1 promoter. α-galactosidase induced by the constitutive PGK1 promoter was used as a food-grade selection marker. The feasibility of the α-galactosidase marker was confirmed by the growth of transformants harboring the constructed vector on a medium containing melibiose as a sole carbon source, and by the clear halo around the transformants in Congo-red plates owing to the expression of β-1,3-1,4-glucanase. The analysis of β-1,3-1,4-glucanase activity in cell pellets and in the supernatant of the recombinant yeast strain revealed that β-1,3-1,4-glucanase was successfully displayed on the cell surface of the yeast. The displayed β-1,3-1,4-glucanase activity in the recombinant yeast cells increased immediately after the addition of galactose and reached 45.1 U/ml after 32-h induction. The thermal stability of β-1,3-1,4-glucanase displayed in the recombinant yeast cells was enhanced compared with the free enzyme. These results suggest that the constructed food-grade yeast has the potential to improve the brewing properties of beer.     

Lymphotactin enhances the in-vitro immune efficacy of dendritoma formed by dendritic cells and mouse hepatocellular carcinoma cells

Objective: To investigate the in-vitro antitumor immune responses of dendritoma formed by mouse hepatocellular carcinoma (HCC) cells and lymphotactin (Lptn) gene modified dendritic cells (DCs). Method: DCs prepared from mouse bone marrow were genetically modified by lymphotactin adenovirus, and fused with H22 cells by polyethylene glycol (PEG). RT-PCR and ELISA were employed to identify lymphotactin expression at mRNA and protein level. Cell phenotypes and fusion efficiency was detected by FACS. The stimulatory effect of DC on T cells was detected by mixed lymphocyte reaction. The cytotoxicity activity against H22 cells was assayed by LDH method. Results: Lymphotactin could be efficiently expressed by DCLptn/H22 hybridoma. DCLptn/H22 cells could induce potent T cell proliferation effect and generate strong cytotoxic T lymphocyte (CTL) reaction against allogenic H22 cells. Conclusion: Lymphotactin genetic modification could enhance the in vitro immune activity of the dendritoma.     

食蟹猴疟原虫酸性磷酸酶电镜细胞化学研究

利用电镜细胞化学方法对食蟹猴疟原虫红内期酸性磷酸酶进行定位研究．结果发现．酸性磷酸酶广泛定位于疟原虫的食物泡、内质网、核糖体和疟色素上；而一些内含物与红细胞相似的双层膜结构内无ACP活性，不属于食物泡，而是宿主细胞的伪足伸入虫体；并认为ACP是由核糖体转运至食物泡内的；外周胞饮作用和胞口援食可能都是疟原虫红内期的营养方式．而外周胞饮作用可以起主要作用．     

Expression of a fusion protein of human ciliary neurotrophic factor and soluble CNTF-Receptor and identification of its activity

INTRODUCTIONCiliaryneurotrophicfactor (CNTF)isanat urallyoccurringproteinwithamolecularmassofapproximately 2 2kDa .Itisexpressedinglialcellswithinthecentralandperipheralnervoussystems.CNTFstimulatesgeneexpression ,cellsurvivalordifferentiationinavarietyof…