To examine the effect of myogenin gene on the differentiation of bovine skeletal muscle satellite cell, we constructed small interfering RNA plasmid vector to obtain myogenin knockdown bovine skeletal muscle cells, th...To examine the effect of myogenin gene on the differentiation of bovine skeletal muscle satellite cell, we constructed small interfering RNA plasmid vector to obtain myogenin knockdown bovine skeletal muscle cells, then used cell transfection, real time RCR and Western Blot to detect the influence of myogenin to cell differentiation. Results showed that the knockdown of myogenin significantly decreased its expression and other muscle-specific genes. Compared to the control, it could differentiate into few myotubes when challenged by low serum in the medium. These findings provided an important theoretical basis for further explore of the genetic mechanism in adult skeletal muscle, the remedy of muscle injuries and the cultivation of high-yield transgenic cattle.展开更多
RNA interference(RNAi),which causes the degradation of any RNA in a sequence specific manner,is a posttranscriptional gene silencing mechanism.Targeting the invariant chain(Ii)in DCs has been used as an approach to en...RNA interference(RNAi),which causes the degradation of any RNA in a sequence specific manner,is a posttranscriptional gene silencing mechanism.Targeting the invariant chain(Ii)in DCs has been used as an approach to enhance antitumor immunity.It is demonstrated in this article that transfection of H-2(K)DCs with siRNA specific for Ii gene can significantly knock down Ii.When exposed to TNF-alpha,immature DCs transfected with Ii siRNA can differentiate into mature DCs without reducing viability or IL-12p70 production.Ii siRNA-treated H-2(K)DCs exhibited an increased allostimulatory capacity in a lymphocyte proliferation assay.Furthermore,Ii siRNA-transfected H-2(K)DCs enhanced Th1 responses by increasing IFN-gamma and decreasing IL-4 production,and much stronger cytotoxic activity was observed when DCs were co-transfected with Ii siRNA and an endogenous tumor antigen in vitro.Our findings indicate that silencing the Ii gene in DCs with siRNA may offer a potential approach to enhancing antitumor immunotherapy.展开更多
转运核糖核酸(tRNA)衍生的小分子RNA(transfer-RNA derived small RNA,tsRNA)是近年来新发现的一类由成熟tRNA或其前体通过特殊的内切酶介导产生的非编码RNA。已有的研究揭示,tsRNA能够在转录及转录后水平上调控基因表达,能以表观遗传...转运核糖核酸(tRNA)衍生的小分子RNA(transfer-RNA derived small RNA,tsRNA)是近年来新发现的一类由成熟tRNA或其前体通过特殊的内切酶介导产生的非编码RNA。已有的研究揭示,tsRNA能够在转录及转录后水平上调控基因表达,能以表观遗传调控因子方式,在多种生物体的生理和病理过程中发挥重要作用,因此,其逐渐成为生物医学的研究热点而引起广泛关注。而且越来越多的证据显示,tsRNA通过对应激反应、细胞增殖与凋亡、神经发育、突触可塑性、神经炎症与免疫调节、表观遗传、RNA加工和蛋白质翻译调控等参与许多神经精神疾病的发生和发展过程。该文主要就tsRNA的生成和分类及其生物学功能,阐述tsRNA在神经发育和神经精神疾病中的作用和可能作用机制,从而进一步揭示tsRNA作为神经精神疾病可靠生物标志物和治疗靶点的潜力。展开更多
目的通过分析tsRNA在肺腺癌中的差异表达情况及其表达水平与患者预后的关系,进一步筛选并验证肺腺癌相关tsRNA,以了解其在肺腺癌发生和进展中的相关机制。方法基于计算医学中心数据库筛选出在肺腺癌组织和正常组织中差异表达的tsRNA;基...目的通过分析tsRNA在肺腺癌中的差异表达情况及其表达水平与患者预后的关系,进一步筛选并验证肺腺癌相关tsRNA,以了解其在肺腺癌发生和进展中的相关机制。方法基于计算医学中心数据库筛选出在肺腺癌组织和正常组织中差异表达的tsRNA;基于癌症基因组图谱(The Cancer Genome Atlas,TCGA)数据库分析tsRNA表达水平对肺腺癌患者预后的影响;基于TRFtarget2.0和tRFTar数据库预测靶基因;基于DAVID、KOBA KEGG在线网站进行基因本体论(Gene Ontology,GO)富集分析和京都基因和基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路分析;基于阿拉巴马大学伯明翰分校癌症数据分析门户(the University of Alabama at Birmingham CANcer data analysis Portal,UALCAN)分析靶基因在肺腺癌组织和正常组织中的表达水平。采用增殖实验、迁移实验、侵袭实验验证tRF-19-69M8LOJX在肺腺癌细胞中的生物学功能。结果与正常组织相比,tRF-19-69M8LOJX在肺腺癌组织中表达上调(log2FC=4.28,FDR<0.05)。高表达水平的tRF-19-69M8LOJX预示着更短的无进展生存期(HR=1.565,95%CI=1.142~2.145,P=0.005);过表达tRF-19-69M8LOJX促进A549细胞的增殖、迁移(P<0.001)和侵袭(P=0.009);COL1A1(P=0.002)和VCAN(P=0.022)在tRF-19-69M8LOJX过表达细胞模型中显著上调。结论tRF-19-69M8LOJX在肺腺癌组织的表达水平上调,与患者不良预后密切相关,可能在肺腺癌的发生发展中起着重要作用。展开更多
目的:鉴定人肝母细胞瘤HepG2细胞中响应DNA损伤的转运RNA衍生的小RNA(transfer RNAderived small RNA,tsRNA)的表达特征,并研究其潜在功能。方法:本研究基于配对的HepG2细胞和敲除TP53基因的HepG2细胞,采用阿霉素(adriamycin,ADR)成功构...目的:鉴定人肝母细胞瘤HepG2细胞中响应DNA损伤的转运RNA衍生的小RNA(transfer RNAderived small RNA,tsRNA)的表达特征,并研究其潜在功能。方法:本研究基于配对的HepG2细胞和敲除TP53基因的HepG2细胞,采用阿霉素(adriamycin,ADR)成功构建DNA损伤的细胞模型,并进行小非编码RNA的转录组分析,系统地鉴定一批响应ADR并参与p53调节的tsRNA,利用京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)进行了功能富集分析。此外,经沉默目标tsRNA基因表达后,通过CCK-8实验和平板集落形成实验初步证实了目标tsRNA在HepG2细胞模型中的生物学功能。结果:DNA损伤可诱导一批参与p53调节的tsRNA,其中tRF-5-1(tRF-5_tRNA-Gly-TCC-2-1)和tRF-i-1(tRF i_tRNA-Tyr-GTA-11-1)在HepG2细胞中的表达上调最为显著(P<0.05)。沉默tRF-5-1或tRF-i-1基因可抑制HepG2细胞的增殖活力(P<0.05)。结论:HepG2细胞模型中可以鉴定一组响应DNA损伤的tsRNA,且tsRNA可以促进HepG2细胞的增殖活力,提示tsRNA在肝脏细胞的恶性增殖中可能扮演重要角色。展开更多
基金Supported by the Ministry of Agricultural Nuarture of New Varieties Genetically Modified Organisms Significant Special Funding (2008ZX08007-002)
文摘To examine the effect of myogenin gene on the differentiation of bovine skeletal muscle satellite cell, we constructed small interfering RNA plasmid vector to obtain myogenin knockdown bovine skeletal muscle cells, then used cell transfection, real time RCR and Western Blot to detect the influence of myogenin to cell differentiation. Results showed that the knockdown of myogenin significantly decreased its expression and other muscle-specific genes. Compared to the control, it could differentiate into few myotubes when challenged by low serum in the medium. These findings provided an important theoretical basis for further explore of the genetic mechanism in adult skeletal muscle, the remedy of muscle injuries and the cultivation of high-yield transgenic cattle.
基金National Nature Science Foundation of China(30570828,30471961,30170915).
文摘RNA interference(RNAi),which causes the degradation of any RNA in a sequence specific manner,is a posttranscriptional gene silencing mechanism.Targeting the invariant chain(Ii)in DCs has been used as an approach to enhance antitumor immunity.It is demonstrated in this article that transfection of H-2(K)DCs with siRNA specific for Ii gene can significantly knock down Ii.When exposed to TNF-alpha,immature DCs transfected with Ii siRNA can differentiate into mature DCs without reducing viability or IL-12p70 production.Ii siRNA-treated H-2(K)DCs exhibited an increased allostimulatory capacity in a lymphocyte proliferation assay.Furthermore,Ii siRNA-transfected H-2(K)DCs enhanced Th1 responses by increasing IFN-gamma and decreasing IL-4 production,and much stronger cytotoxic activity was observed when DCs were co-transfected with Ii siRNA and an endogenous tumor antigen in vitro.Our findings indicate that silencing the Ii gene in DCs with siRNA may offer a potential approach to enhancing antitumor immunotherapy.
文摘转运核糖核酸(tRNA)衍生的小分子RNA(transfer-RNA derived small RNA,tsRNA)是近年来新发现的一类由成熟tRNA或其前体通过特殊的内切酶介导产生的非编码RNA。已有的研究揭示,tsRNA能够在转录及转录后水平上调控基因表达,能以表观遗传调控因子方式,在多种生物体的生理和病理过程中发挥重要作用,因此,其逐渐成为生物医学的研究热点而引起广泛关注。而且越来越多的证据显示,tsRNA通过对应激反应、细胞增殖与凋亡、神经发育、突触可塑性、神经炎症与免疫调节、表观遗传、RNA加工和蛋白质翻译调控等参与许多神经精神疾病的发生和发展过程。该文主要就tsRNA的生成和分类及其生物学功能,阐述tsRNA在神经发育和神经精神疾病中的作用和可能作用机制,从而进一步揭示tsRNA作为神经精神疾病可靠生物标志物和治疗靶点的潜力。
文摘目的通过分析tsRNA在肺腺癌中的差异表达情况及其表达水平与患者预后的关系,进一步筛选并验证肺腺癌相关tsRNA,以了解其在肺腺癌发生和进展中的相关机制。方法基于计算医学中心数据库筛选出在肺腺癌组织和正常组织中差异表达的tsRNA;基于癌症基因组图谱(The Cancer Genome Atlas,TCGA)数据库分析tsRNA表达水平对肺腺癌患者预后的影响;基于TRFtarget2.0和tRFTar数据库预测靶基因;基于DAVID、KOBA KEGG在线网站进行基因本体论(Gene Ontology,GO)富集分析和京都基因和基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路分析;基于阿拉巴马大学伯明翰分校癌症数据分析门户(the University of Alabama at Birmingham CANcer data analysis Portal,UALCAN)分析靶基因在肺腺癌组织和正常组织中的表达水平。采用增殖实验、迁移实验、侵袭实验验证tRF-19-69M8LOJX在肺腺癌细胞中的生物学功能。结果与正常组织相比,tRF-19-69M8LOJX在肺腺癌组织中表达上调(log2FC=4.28,FDR<0.05)。高表达水平的tRF-19-69M8LOJX预示着更短的无进展生存期(HR=1.565,95%CI=1.142~2.145,P=0.005);过表达tRF-19-69M8LOJX促进A549细胞的增殖、迁移(P<0.001)和侵袭(P=0.009);COL1A1(P=0.002)和VCAN(P=0.022)在tRF-19-69M8LOJX过表达细胞模型中显著上调。结论tRF-19-69M8LOJX在肺腺癌组织的表达水平上调,与患者不良预后密切相关,可能在肺腺癌的发生发展中起着重要作用。
文摘目的:鉴定人肝母细胞瘤HepG2细胞中响应DNA损伤的转运RNA衍生的小RNA(transfer RNAderived small RNA,tsRNA)的表达特征,并研究其潜在功能。方法:本研究基于配对的HepG2细胞和敲除TP53基因的HepG2细胞,采用阿霉素(adriamycin,ADR)成功构建DNA损伤的细胞模型,并进行小非编码RNA的转录组分析,系统地鉴定一批响应ADR并参与p53调节的tsRNA,利用京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)进行了功能富集分析。此外,经沉默目标tsRNA基因表达后,通过CCK-8实验和平板集落形成实验初步证实了目标tsRNA在HepG2细胞模型中的生物学功能。结果:DNA损伤可诱导一批参与p53调节的tsRNA,其中tRF-5-1(tRF-5_tRNA-Gly-TCC-2-1)和tRF-i-1(tRF i_tRNA-Tyr-GTA-11-1)在HepG2细胞中的表达上调最为显著(P<0.05)。沉默tRF-5-1或tRF-i-1基因可抑制HepG2细胞的增殖活力(P<0.05)。结论:HepG2细胞模型中可以鉴定一组响应DNA损伤的tsRNA,且tsRNA可以促进HepG2细胞的增殖活力,提示tsRNA在肝脏细胞的恶性增殖中可能扮演重要角色。
