The effect of low glucose and high lactic acid on the survival of Hela

目的:探讨低糖高乳酸环境对宫颈癌细胞生存的影响,以及对EGFR-mTOR通路的调节作用。方法:将Hela细胞培养于常糖(葡萄糖10mmol/L); 、低糖(葡萄糖3mmol/L)、高乳酸(葡萄糖10mmol/L,乳酸2.5mmol/L)、低糖高乳酸(葡萄糖3mmol/L,乳酸2.5mmol/; L)4种环境下,CCK-8法测定Hela细胞的生长抑制率,流式细胞术测定细胞周期。荧光实时定量PCR法检测EGFR和mTOR; mRNA水平表达。结果:与常糖组相比,高乳酸组的细胞抑制率显著升高(P<0.01),48h细胞G_1/G_0期比例显著升高(P<0.01),细胞; 凋亡率、EGFR和mTOR; mRNA表达水平均无变化。与常糖组相比,低糖组的细胞抑制率显著升高(P<0.01),48h细胞凋亡率显著降低(P<0.01),细胞各周期比例变化; 与常糖组无差异,EGFR表达水平降低(P<0.05)。与常糖组相比,低糖高乳酸组的细胞抑制率显著升高(P<0.01),但低于低糖组(P<0.01; )和高乳酸组(P<0.05),48h G_1/G_0期比例显著升高(P<0.01),细胞诱导凋亡率显著升高(P<0.01),EGFR和mTOR; mRNA表达水平均显著升高(P<0.01)。结论:Hela细胞在低糖高乳酸环境中的存活状况好于单纯低糖和单纯高乳酸环境,且伴随着EGFR和mTO; R基因表达水平上升。Objective:To explore the effect of the low glucose and high lactic acid; environment of survival of cervical carcinoma cells,and the regulation; of EGFR-mTOR signal way.Methods:Hela cells were cultured in four; conditions:normal glucose (glucose 10mmol/L),low glucose (glucose; 3mmol/L),high lactic acid (lactic acid 2.5mmol/L) and low glucose add; high lactic acid (glucose 3mmol/L,lactic acid 2.5mmol/L).Growth; inhibition rate of Hela cell was determined by CCK-8.Flow cytometry; (FCM)were performed to evaluate the cell cycle.The expression levels of; EGFR and mTOR mRNA were detected using real-time quantitative polymerase; chain reaction (real-time PCR).Results:Compared with those in regular; sugar environment,the cell growth inhibition rates were significantly; increased in high lactic acid environment(P<0.01).At 48h,the rate of; G_1/G_0 was significantly increased (P<0.01),while the apoptosis rate of; the cells and the expressions of EGFR and mTOR mRNA had no; change.Compared with those in regular sugar environment,the cell growth; inhibition rates were significantly increased in high lactic acid; environment,(P<0.01),while lower than those in low glucose; environment(P<0.01) and in high acid environment(P<0.05).The rates of; G_1,G_2 and S phase had no change.The expressions of EGFR mRNA was; reduced (P<0.05).The cell growth inhibition rates were significantly; increased in high lactic acid add low glucose environment (P<0.01).At; 48h,the apoptosis rate and the rate of G_1/G_0 were significantly; increased (P<0.01),while the EGFR and mTOR expression levels were also; increased (P<0.05).Conclusion:Hela in the low glucose add high lactic; acid survives better than those in low glucose and in high lactic acid; environment,while the expression of EGFR and mTOR is increased.泉州市科技计划立项项目; 国家面上项

Selective Oxidation of Methane to Methanol in Oleum over Pd/C Catalyst

以PdCl2为前驱体,采用浸渍法制备了Pd/C催化剂,并在发烟硫酸中考察了其催化甲烷选择氧化反应的性能,采用X射线粉末衍射、X射线光电子能谱、高分辨透射电镜和CO吸附等方法对催化剂进行了表征.甲烷选择氧化反应得到的主产物硫酸单甲酯经水解后得到甲醇,在5%Pd/C催化剂、Pd用量30μmol、反应温度180℃、反应压力4.0 MPa、反应时间4 h和发烟硫酸中SO3含量为50%的优化工艺条件下,甲烷转化率为23.6%,甲醇的选择性和收率分别为69.5%和16.4%,在一定程度上可实现催化剂的多次重复使用.Pd/C催化剂上的甲烷选择氧化反应可能遵循亲电取代机理,催化性能与Pd负载量、Pd粒子尺寸和分散度等有关.The selective oxidation of methane to methanol over Pd/C catalysts generated from a PdCl2 precursor was investigated in oleum.Characterization of the catalysts was performed by X-ray diffraction,X-ray photoelectron spectroscopy,high-resolution transmission electron microscopy,and CO adsorption.The major product in the oxidation reaction was methyl bisulfate,which was then hydrolyzed into methanol.Methane conversion of 23.6% with methanol selectivity of 69.5% and yield of 16.4% was achieved under the optimum conditions of 5%Pd/C,30 μmol Pd,reaction temperature 180 ℃,methane pressure 4.0 MPa,reaction time 4 h,and 50% sulfur trioxide concentration.After facile separation with the reactants and pretreatment,the catalyst could be reused several times with considerable stability.The selective oxidation of methane catalyzed by Pd/C catalysts in oleum possibly involved an electrophilic substitute mechanism.The catalytic performance was related to the Pd loading,dispersion,and particle size.国家自然科学基金(20473065);; 福建省科技重大专项(2005HZ01-3

低糖高乳酸环境下吉非替尼诱导HeLa细胞EGFR-TKI耐药的研究

目的探讨低糖高乳酸微环境对表皮生长因子酪氨酸激酶抑制剂(EGFR-TKI)抑制HeLa细胞的影响和可能机制。方法HeLa细胞在常糖(葡萄糖10; mmol/L)和低糖高乳酸(葡萄糖3 mmol/L +乳酸2.5 mmol/L)环境下培养,并分别给予2.67; mumol/L吉非替尼干预。采用CCK-8法测定HeLa细胞生长抑制率,流式细胞术检测细胞周期,荧光定量RT-PCR检测EGFR和mTOR; mRNA水平的表达。结果与常糖组比较,低糖乳酸组24 h和72 h细胞抑制率均显著升高(P < 0.01),48; h细胞抑制率略高于常糖组。与吉非替尼阴性组比较,常糖+吉非替尼组和低糖乳酸+吉非替尼组在24、48、72 h三个时点细胞抑制率均显著上升(P <; 0.01)。与常糖组相比,低糖乳酸组48 h细胞诱导凋亡率显著上升(P <; 0.01),低糖乳酸+吉非替尼组细胞诱导凋亡率较低糖乳酸组显著降低(P < 0.01)。与常糖组比较,低糖乳酸组存活细胞的EGFR和mTOR; mRNA表达水平上调(P < 0.05)。常糖+吉非替尼组的EGFR和mTOR mRNA水平均上调(P <; 0.05)。与低糖乳酸组比较,低糖乳酸+吉非替尼组的EGFR和mTOR mRNA上调水平有显著差异(P <; 0.01)。结论高乳酸低糖环境下吉非替尼可大幅度上调存活HeLa细胞EGFR和mTOR表达水平,可能是诱导HeLa细胞抵抗EGFR-TKI的机制; 。泉州市第一医院青年科研; 泉州市科技计划项目; 国家面上项

糖尿病胃肠病中医诊疗标准

文章所讨论的糖尿病胃肠病中医诊疗标准是在中华中医药学会2007年发布的《糖尿病中医防治指南》的基础上,研究、整合、优化以往中医糖尿病标准方面的研究成果,结合临床实际,研究而形成的能够被学术界普遍认可的诊疗标准。文章对糖尿病胃肠病的临床表现、理化检查、鉴别诊断、处理原则、辨证施治、成药治疗、辅助疗法、西医治疗等分别进行阐述,旨在进一步推广和发挥中医药在治疗糖尿病胃肠病时的特色与优势,规范糖尿病胃肠病的诊疗行为,促进糖尿病胃肠病中医药临床疗效的进一步提升

Cu-Zn-Al-Zr甲醇合成催化剂的UVDR、TPD和TPR表征

在 Cu- Zn- Al甲醇合成催化剂中添加适量的氧化锆助剂 ,制得 Cu- Zn- Al- Zr催化剂及表征其特性 .实验结果表明 ,Cu- Zn- Al- Zr催化剂最佳反应温度为 2 30℃ ,比 Cu- Zn- Al低约 10℃ ;热处理前后甲醇得率分别比 Cu- Zn- Al高 16%和 38% .UVDR表征显示 ,反应后催化剂在 5 98nm处观测到在 Zn O晶格介面上的 Cu+;CO- TPD表征显示 ,经 4 5 0℃热处理后的催化剂只在 182℃～ 197℃处出现一个由 Cu0 位贡献的吸附峰 ,热处理前在 2 61℃～ 2 74℃处由 Cu+位贡献的吸附峰消失 .Cu-Zn- Al- Zr催化剂对 CO的吸附量和 Cu+含量均大于 Cu- Zn- Al催化剂 ,这与该催化剂具有较好的低温活性和较高的热稳定性密切相

Selective oxidation of methane to methanol in oleum over Pd/C catalyst

The selective oxidation of methane to methanol over Pd/C catalysts generated from a PdCl2, precursor was investigated in oleum. Characterization of the catalysts was performed by X-ray diffraction, X-ray photo-electron spectroscopy, high-resolution transmission electron microscopy, and CO adsorption. The major product ill the oxidation reaction was methyl bisulfate, which was then hydrolyzed into methanol. Methane conversion of 23.6% with methanol selectivity of 69.5% and yield of 16.4% was achieved under the optimum conditions of 5% Pd/C, 30 mu mol Pd, reatction temperature 180 degrees C, methane pressure 4. 0 MPa, reaction time 4 h, and 50% sulfur trioxide concentration. After facile separation with the reactants and pretreatment, the catalyst could be reused several times with considerable stability. The selective oxidation of methane catalyzed by Pd/C catalysts in oleum possibly involved an electrophilic substitute mechanism. The catalystic performance was related to the Pd loading, dispersion, and particle size