Peroxiredoxin2基因RNAi慢病毒载体构建及对SW480细胞增殖的影响

目的：构建Peroxiredoxin2（PRDX2）基因RNA干扰（RNAinterference,RNAi）慢病毒表达载体,探讨PRDX2基因干扰后对结直肠癌SW480细胞增殖的影响。方法设计、合成靶向PRDX2的RNA干扰的序列,构建pGC‐EGFP‐shPRDX2慢病毒载体并进行鉴定,同时应用qRT‐PCR和Westernblot方法观察转染的SW480结肠癌细胞PRDX2mRNA和蛋白表达的抑制效果,并通过MTT、平板克隆形成实验检测细胞增殖变化。结果成功构建PRDX2基因慢病毒载体并经测序证实;pGC‐EGFP‐shPRDX2可有效抑制结直肠癌SW480细胞PRDX2的表达,感染慢病毒的SW480细胞中PRDX2mRNA和蛋白表达水平明显降低（P＜0．05）;SW480细胞经PRDX2RNA干扰后其生长和增殖能力显著降低（P＜0．05）。结论PRDX2基因RNAi慢病毒表达载体在SW480细胞中表达稳定可靠,PRDX2基因干扰后有效抑制了结直肠癌SW480细胞的增殖和生长,为进一步探讨PRDX2在结直肠癌发生、发展及转移中的作用奠定基础。     

Chemoprevention of liver cancer by plant polyphenols

Primary liver cancer or hepatocellular carcinoma (HCC) is one of the most frequent tumors representing the fifth commonest malignancy worldwide and the third cause of mortality from cancer. Currently, the treatments for HCC are not so effective and new strategies are needed for its fight. Chemoprevention, the use of natural or synthetic chemical agents to reverse, suppress or prevent carcinogenesis is considered an important way for confronting HCC. Many of the chemopreventive agents are phytochemicals, namely non-nutritive plant chemicals with protective or disease preventive properties. In this review, we focus on plant polyphenols, one of the most important classes of phytochemicals, their chemopreventive properties against HCC and discuss the molecular mechanisms accounting for this activity.     

Association of creatin kinase B and peroxiredoxin 2 expression with age and embryo quality in cumulus cells

Purpose  

The purpose of this study was to identify age-related oocyte or embryo markers suitable for non-invasive analysis, as women over 38 years of age experience diminished pregnancy and ovulation rates.     

RNAi沉默PRDX Ⅲ基因表达诱导U251胶质瘤细胞凋亡的实验研究

目的探讨RNAi沉默PRDXⅢ基因表达诱导U251胶质瘤细胞凋亡。方法设计合成针对PRDXⅢ的siRNA,脂质体介导转染人U251多形胶质母细胞瘤细胞,RT-PCR法检测转染后24 h PRDXⅢmRNA的表达水平,Western-blotting检测转染后48 h PRDXⅢ蛋白的表达水平,筛选出有效的干扰序列;流式细胞仪、DNAladder、PI染色检测转染后48 hU251细胞的凋亡状况,MTT检测转染后48 h U251细胞的生长抑制率。结果 RT-PCR、Western Blotting检测显示空白对照组、空载体组和无关序列组PRDXⅢmRNA表达无明显变化,干扰序列1、3使PRDXⅢmRNA的表达明显降低。DNA ladder显示干扰组出现明显梯形电泳条带,空白对照组、空载体组和无关序列组细胞未见明显梯形电泳条带。PI染色结果显示空白对照组,空载体组和无关序列组细胞未见明显凋亡,而干扰组细胞核的染色质高度浓染,部分细胞核裂解为碎块,符合凋亡形态学的改变。FCM检测结果显示干扰组细胞凋亡率明显高于空白对照组、空载体组、无关序列组（P〈0.01）。MTT检测干扰组对U251细胞生长的抑制率为44.4%,明显减慢了细胞生长（P〈0.01）。结论 RNAi技术成功地抑制了U251细胞中PRDXⅢ基因的表达,并诱导U251细胞凋亡,表明PRDXⅢ基因与胶质瘤的凋亡有关,PRDXⅢ基因有可能成为胶质瘤基因治疗的靶基因。     

Hippocampus protein profiling reveals aberration of malate dehydrogenase in chlorpromazine/clozapine treated rats

Chlorpromazine and clozapine are antipsychotic agents used to relieve symptoms of early-diagnosed schizophrenia. In this study, we used proteomics technology to screen the protein aberration in Sprague-Dawley rats treated with these two antipsychotic agents. Our goal was to identify the effects of antipsychotics on hippocampal proteins in rats. Protein expression profiles were compared in each experimental group using two-dimensional gel electrophoresis and identified using matrix-assisted laser desorption/ionisation time of flight mass spectrometry. Malate dehydrogenase, peroxiredoxin 3, vacuolar ATP synthase subunit beta and mitogen-activated protein kinase kinase 1 were found to have altered expression levels in the groups treated with antipsychotics compared with the matched controls. These findings should contribute to identifying new targets for disease preventing pharmacological agents and be beneficial for the development of more effective agents.     

慢病毒沉默PRDX4抑制肺癌细胞A549迁移和侵袭及其机制的探讨北大核心

目的:研究慢病毒沉默过氧化物还原酶4(peroxiredoxin 4,PRDX4)对肺癌细胞迁移和侵袭能力的影响,并探讨其分子机制。方法:采用shRNA干扰技术敲低肺癌细胞系A549中PRDX4的表达,Western blot和qRT-PCR验证转染效果;划痕愈合实验检测细胞迁移能力;Transwell细胞侵袭实验检测细胞侵袭能力;Western blot分析p-ERK1/2、N-cadherin、Vimentin蛋白表达。结果:成功构建沉默PRDX4的肺癌细胞系;慢病毒感染后A549细胞PRDX4蛋白和mRNA表达水平显著低于对照组(P<0.05);与BC组和NC组相比,Sh组细胞迁移、侵袭能力显著降低(P<0.05);与BC组和NC组相比,Sh组细胞p-ERK1/2、N-cadherin、Vimentin蛋白表达水平显著降低。结论:沉默PRDX4可能通过ERK信号通路抑制肺癌细胞的迁移和侵袭。