EZH2对胃癌细胞核因子κB靶基因的调节作用

 目的: 探讨zeste同源物增强子2 (EZH2) 蛋白的表达对胃癌细胞的影响以及可能的作用机制。方法: 用real-time PCR 和Western blot实验检测正常胃黏膜上皮细胞和不同胃癌细胞系中EZH2的mRNA和蛋白表达;采用细胞生长、细胞迁移以及软琼脂增殖实验测定EZH2对胃癌细胞系致癌能力的影响;利用萤光素酶报告基因和real-time PCR检测EZH2对核因子κB靶基因的调节作用;用免疫共沉淀法检测EZH2和p65的相互作用。结果: 与正常胃上皮细胞相比,胃癌细胞系中的EZH2过量表达(P<0.05)。EZH2特异性抑制剂腺苷类似物DZNep处理或shEZH2抑制了AGS和SNU-16细胞系的细胞活力。此外,DZNep和shEZH2 抑制了AGS细胞迁移及软琼脂细胞形成的克隆数目(P<0.05)。shEZH2 下调了核因子κB报告基因或白细胞介素8报告基因的活性以及核因子κB靶基因白细胞介素8、趋化因子配体5及趋化因子配体20的表达(P<0.05)。此外,EZH2可以特异性与p65蛋白相互作用。结论: EZH2 通过调节核因子κB靶基因介导胃癌细胞的生长。     

miRNA-101-3p靶向调控EZH2蛋白抑制胃癌细胞增殖和迁移

目的:研究微小RNA-101-3p(miRNA-101-3p)对人胃癌细胞增殖、凋亡和迁移的影响及其可能的调控机制。方法:Real-time PCR检测2种人胃癌细胞和1种胃黏膜细胞中miRNA-101-3p和zeste增强子同源物2(EZH2)的表达水平;采用脂质体瞬时转染技术过表达miRNA-101-3p;流式细胞术检测miRNA-101-3p对胃癌细胞周期和凋亡的影响;Transwell实验、CCK-8法和台盼蓝染色法检测miRNA-101-3p对胃癌细胞迁移和增殖能力的影响;Western blot法检测EZH2的表达。结果:miRNA-101-3p在胃癌细胞的表达水平显著低于胃黏膜细胞(P0.05);过表达miRNA-101-3p后,流式细胞术结果显示胃癌细胞的S期比例减少,G0/G1期比例增加,早期凋亡率增加(P0.05);CCK-8法、台盼蓝染色法及Transwell实验结果显示胃癌细胞的增殖和迁移能力显著降低(P0.05);Western blot结果显示胃癌细胞中EZH2蛋白的表达明显下降(P0.05)。结论:miRNA-101-3p可能通过靶向负调控EZH2蛋白的表达抑制胃癌细胞的增殖和迁移,进而促进胃癌细胞凋亡。     

miR-433-3p靶向HP1BP3抑制胃癌细胞的增殖、迁移和侵袭能力

目的：探究微小RNA-433-3p(miR-433-3p)对胃癌细胞增殖、迁移和侵袭的影响，以及miR-433-3p靶向异染色质蛋白1结合蛋白3(HP1BP3)对胃癌细胞的调控作用。方法：将人胃癌细胞系HGC-27和AGS分为阴性对照（NC）mimic组、miR-433-3p mimic组、NC siRNA (si-NC)组和HP1BP3 siRNA (si-HP1BP3)组，分别转染NC mimic、miR-433-3p mimic、si-NC和si-HP1BP3。RT-qPCR检测miR-433-3p在HGC-27和AGS细胞中的表达；CCK-8法和细胞集落形成实验检测细胞增殖；划痕愈合实验检测细胞迁移；Traswell实验检测细胞侵袭；Western blot检测HP1BP3蛋白表达。结果：与NC mimic组相比，miR-433-3p mimic组HGC-27和AGS细胞中miR-433-3p表达升高。过表达miR-433-3p抑制HGC-27和AGS细胞的增殖、迁移和侵袭，抑制HP1BP3蛋白表达；敲减HP1BP3抑制HGC-27和AGS细胞的增殖和迁移。结论：miR-433...     

利多卡因通过LncRNA H19/miR-671-5p分子轴调控胃癌细胞增殖、迁移及侵袭北大核心CSCD

目的:探讨利多卡因对胃癌细胞增殖、迁移及侵袭的影响及其对LncRNA H19/miR-671-5p的调控机制。方法:体外培养胃癌细胞AGS,使用不同浓度的利多卡因处理细胞;MTT检测细胞增殖;Transwell小室实验检测细胞迁移及侵袭;qRT-PCR检测H19及miR-671-5p的表达量;双荧光素酶报告实验验证H19与miR-671-5p的靶向关系;将pcDNA-H19及其阴性对照pcDNA转染至AGS细胞,使用利多卡因处理细胞,采用上述方法检测细胞增殖、迁移及侵袭;Western blot检测增殖标记蛋白细胞增殖核抗原-67(Ki-67)、增殖细胞核抗原(PCNA)、上皮型钙黏蛋白(E-cadherin)、神经型钙黏蛋白(N-cadherin)的表达量。结果:与Con组相比,利多卡因不同剂量可明显降低细胞活力和Ki-67、PCNA、N-cadherin蛋白水平及H19的表达量(P<0.05),并可减少迁移及侵袭细胞数(P<0.05),提高E-cadherin蛋白水平及miR-671-5p的表达量(P<0.05);双荧光素酶报告实验证实H19可靶向结合miR-671-5p;H19过表达可明显逆转利多卡因对细胞增殖、迁移及侵袭的作用。结论:利多卡因可能通过抑制H19表达及促进miR-671-5p表达从而抑制胃癌细胞的增殖、迁移及侵袭。     

蔓荆子黄素通过上调miR-1193表达调控胃癌细胞的增殖和凋亡

目的:探讨蔓荆子黄素对胃癌细胞增殖、凋亡的影响及可能机制.方法:不同浓度的蔓荆子黄素作用于胃癌细胞AGS后,CCK-8实验和流式细胞术分别检测细胞的增殖和凋亡,RT-qPCR检测miR-1193表达量,Western blot检测CyclinD1、p21、Bcl-2和Bax蛋白表达.将miR-1193模拟物转染至AGS...     

TWEAK反义寡核苷酸对人结肠癌细胞系SW480增殖及侵袭能力的影响

目的观察肿瘤坏死因子样凋亡微弱诱导剂(TWEAK)对人结肠癌细胞系SW480增殖及侵袭能力的影响。方法合成TWEAK反义寡核苷酸(ASODN)、错义寡核苷酸(SCODN)后转染人结肠癌细胞系SW480,将细胞分为空白对照组、脂质体(LF)对照组、ASODN组、SCODN组;采用MTT法检测肿瘤细胞增殖抑制情况,流式细胞术(FCM)检测肿瘤细胞周期分布,ELISA法检测细胞培养液上清中可溶性TWEAK及其受体成纤维细胞生长因子诱导早期反应蛋白14(Fn14)的表达,Western blotting法、免疫荧光细胞化学法(IF)检测细胞中的TWEAK及Fn14蛋白的表达,运用Transwell侵袭实验观测结肠癌细胞侵袭能力的变化。结果空白对照组、LF对照组、SCODN组之间结肠癌细胞的增殖情况无明显差异(P0.05),与对照组相比ASODN组肿瘤细胞增殖受到明显抑制(P0.05),且呈剂量-时间依赖关系;转染TWEAK ASODN后,G2+M期细胞比例明显高于对照组(P0.05),TWEAK及其受体Fn14在结肠癌细胞培养液及细胞内的表达均低于对照组,差异均有统计学意义(P0.05);转染TWEAK ASODN后肿瘤细胞侵袭抑制率为31.39%,明显高于对照组(P0.05);TWEAK及其受体Fn14在结肠癌细胞培养液及细胞内的表达均密切相关(P0.05)。结论 TWEAK ASODN可能通过抑制TWEAK与其受体Fn14结合干扰肿瘤的发生发展,抑制TWEAK表达能抑制人结肠癌细胞系SW480的增殖与侵袭。     

KIF18B在胃癌细胞增殖、迁移中的作用及机制研究

目的 探究驱动蛋白超家族18B(KIF18B)对胃癌细胞增殖、 迁移的影响及潜在调控机制.方法 采用qRT-PCR和Western印迹分析胃癌组织和细胞(MKN-28、AGS、HGC-27)中KIF18B的表达水平;通过CCK-8、克隆形成以及划痕实验检测胃癌细胞的增殖、迁移情况;Western印迹法检测迁移蛋白(E-...     

lncRNA XIST通过靶向miR-3666调控胃癌细胞增殖、侵袭转移机制北大核心CSCD

目的:探讨lncRNA XIST对胃癌细胞增殖、侵袭转移的影响及分子机制。方法:收集武汉市第四医院30例胃癌患者癌组织及癌旁组织,培养正常胃黏膜上皮细胞MRG-1、胃癌细胞SGC-7901和AGS,采用实时荧光定量PCR(RT-qPCR)检测lncRNA XIST和miR-3666表达水平;通过敲减胃腺癌细胞AGS中lncRNA XIST表达以及下调miR-3666表达水平,分析lncRNA XIST及miR-3666对胃癌细胞的调控作用,将细胞AGS分为si-NC组、si-XIST组、miR-NC组、miR-3666组、si-XIST+antimiR-NC组、si-XIST+anti-miR-3666组;MTT检测细胞增殖情况;Transwell检测细胞迁移和侵袭;流式细胞术检测细胞凋亡;双荧光素酶报告实验检测lncRNA XIST和miR-3666的靶向关系。结果:与癌旁组织和正常胃黏膜上皮细胞MRG-1比较,胃癌组织和AGS、SGC-7901细胞中XIST表达水平升高,miR-3666表达水平降低(P<0.05)。敲除lncRNA XIST或过表达miR-3666,AGS细胞增殖能力减弱,迁移和侵袭能力降低,细胞凋亡率升高(P<0.05)。lncRNA XIST靶向调控miR-3666,抑制miR-3666逆转了XIST基因敲除对胃癌AGS细胞增殖、运动性及凋亡的影响。结论:敲除lncRNA XIST可通过上调miR-3666抑制胃癌细胞增殖、迁移和侵袭,并促进细胞凋亡。     

β-拉帕醌对胃癌细胞生长与侵袭的抑制作用及机制

目的：探讨β-拉帕醌体外抑制胃癌细胞增殖和迁移及诱导凋亡的作用及机制。方法应用噻唑蓝（ MTT）及平板克隆实验检测β-拉帕醌对SGC-7901与AGS胃癌细胞增殖的影响,划痕实验检测β-拉帕醌抑制胃癌细胞的迁移能力,流式细胞术检测β-拉帕醌诱导胃癌细胞凋亡的作用。应用Western b1ot法检测β-拉帕醌处理胃癌细胞前后其增殖、迁移、上皮-间质转化（ epithe1ia1-mesenchyma1 transition,EMT）及凋亡分子标志物的变化。结果β-拉帕醌可显著抑制SGC-7901和AGS胃癌细胞的增殖能力,并下调增殖与周期相关Skp2和DEK蛋白的表达（ P均<0.05）;经β-拉帕醌处理后,胃癌细胞的迁移能力明显下降,且显著下调MMP-2/9和Ezrin蛋白以及EMT间质标志物的表达,上调EMT上皮标志物表达水平;另外,β-拉帕醌增加胃癌细胞的凋亡,下调BCL-2/Bax比值以及上调活化型Caspase-3/8/9的表达。结论β-拉帕醌对胃癌细胞有明显的抑制增殖及诱导凋亡的作用,并可通过MMPs和EMT途径抑制胃癌细胞的迁移能力。     

下调USP9X表达对胃癌AGS细胞凋亡和侵袭能力的影响

目的:探讨下调X染色体连锁的泛素特异性肽酶9(USP9X)表达对胃癌细胞凋亡和侵袭能力的影响,并探讨其可能的分子机制。方法:将USP9X小干扰RNA(siRNA)和对照siRNA转染胃癌AGS细胞,将细胞分为3组:未处理的AGS组、对照siRNA组和USP9X siRNA组。采用real-time PCR和Western blot检测不同处理组的胃癌AGS细胞中USP9X的mRNA和蛋白表达。CCK-8法检测细胞活力;流式细胞术和Boyden小室分别检测不同处理组胃癌AGS细胞的凋亡和侵袭能力;Western blot检测凋亡和侵袭相关蛋白的表达水平。结果:USP9X siRNA显著下调胃癌AGS细胞中USP9X的mRNA和蛋白表达水平。USP9X表达下调显著诱导胃癌细胞凋亡,并降低胃癌细胞的侵袭能力。USP9X表达下调显著降低Mcl-1和MMP-2的表达,但明显上调Bax蛋白的表达(P0.05)。结论:USP9X可能是胃癌细胞凋亡和侵袭的关键调控因子。     

CADM1过表达对人胃癌MKN-45细胞增殖和侵袭的影响及其分子机制

 目的：研究细胞黏附分子1（cell adhesion molecule 1,CADM1）过表达对人胃癌MKN-45细胞增殖和侵袭的影响并探讨其可能的分子机制。方法：采用Western blotting检测3株胃癌细胞系中CADM1蛋白的表达。构建pcDNA-CADM1真核表达载体,并将其转染MKN-45细胞,采用G418筛选稳定表达CADM1的细胞株,利用Western blotting鉴定所筛选的稳定细胞株。采用CCK-8试剂和Boyden小室分析过表达CADM1对MKN-45细胞增殖和侵袭的影响。利用Western blotting检测细胞增殖和侵袭相关蛋白表达。结果：MKN-45细胞中CADM1蛋白的相对表达水平显著低于MKN-28和SGC-7901细胞（P<0.05）。此外,成功构建pcDNA-CADM1真核表达载体,并获得稳定过表达CADM1的MKN-45细胞株。CCK-8结果显示,与未处理组和pcDNA3.1组相比,pcDNA-CADM1组中MKN-45细胞的增殖明显受到抑制（P<0.05）。Boyden小室体外侵袭实验结果显示,与未处理组（101.53±6.89）和pcDNA3.1组（98.77±7.03）相比,pcDNA-CADM1组中MKN-45细胞穿膜的细胞数（52.35±3.89）显著减少（P<0.05）。Western blotting结果显示,与未处理组和pcDNA3.1组相比,pcDNA-CADM1组中p21蛋白表达显著上调,而MMP-2和MMP-9表达显著下调（P<0.05）。结论：CADM1过表达能明显抑制胃癌细胞的增殖和侵袭能力,因而CADM1有望成为胃癌治疗的新靶点。     

白藜芦醇抑制胃癌BGC823细胞增殖机制的研究

目的观察白藜芦醇(Res)抑制人胃癌BGC823细胞增殖的影响。方法采用MTT法、集落形成实验、流式细胞仪(FCM)和检测端粒酶活性来观察Res作用于人胃癌BGC823细胞48h后对肿瘤细胞增殖和细胞周期的影响。结果1.5、3.0、6.0、12.0、24.0mg/L的Res对人胃癌BGC823细胞生长抑制率分别为19.1%、25.3%、52.6%、67.9%、91.3%,Res处理后BGC823细胞集落形成明显受到抑制,使细胞周期阻滞于S期,端粒酶活性受到抑制。结论Res对人胃癌BGC823细胞的增殖抑制作用明显。     

Heat shock proteins play a crucial role in tumor-specific apoptosis by REIC/Dkk-3

We recently showed that overexpression of REIC/Dickkopf-3 (Dkk-3), a tumor suppressor gene, induced apoptosis in a tumor cell-specific manner. The aim of the present study was to determine the mechanisms underlying the selective induction of apoptosis. At first, we found a mouse renal carcinoma cell line, RENCA, to be extremely sensitive to an adenovirus carrying REIC/Dkk-3 (Ad-REIC), and we showed that activation of c-Jun N-terminal kinase (JNK) was a critical step in cell death, i.e. a process similar to that in human prostate and testicular cancer observed in our previous studies. Among the proteins interfering with the activation of JNK, heat shock protein (Hsp)70/72 was reduced in expression in RENCA cells compared with that in NIH3T3 cells. An Hsp70/72 inducer protected RENCA cells from Ad-REIC-induced apoptosis, while an Hsp70/72 inhibitor sensitized NIH3T3 cells for apoptosis induction. These results indicate that functionally active Hsp70/72 is a key factor in tumor cell-specific induction of apoptotic cell death and that analyses of the expression levels of Hsp70/72 may be essential in determining the significance of Ad-REIC-based gene therapy against human cancer.     

姜黄素通过ATK/FoxM1信号通路调控胃癌干细胞增殖及凋亡

BACKGROUND:Curcumin has crucial inhibitory effects on various cancer cells and cancer stem cells. However, its effect on gastric cancer stem cells and the underlying mechanism of this effect are unclear. OBJECTIVE:To explore the effect of curcumin on gastric cancer stem cells and the underlying mechanism. METHODS:Tumor sphere-forming assay and gastric cancer stem cell markers (EpCAM and CD44) were used to separate gastric cancer stem cells from gastric cancer SGC7901 cell lines. Effects of curcumin on the proliferation and apoptosis of gastric cancer stem cells were determined by MTT and flow cytometry analysis, respectively. Western blot analysis was used to detect the expression levels of FoxM1, p-AKT, and AKT. LY294002, an inhibitor of the PI3K/AKT pathway, was used to determine the regulatory relationship between AKT and FoxM1 signaling pathways. RESULTS AND CONCLUSION:The EpCAM+/CD44+ gastric cancer stem cells were successfully isolated from SGC7901 cells. MTT assay showed that curcumin inhibited the proliferation of gastric cancer stem cells, while flow cytometry analysis showed that curcumin induced apoptosis in gastric cancer stem cells. In addition, the expression levels of p-AKT and FoxM1 were decreased by curcumin treatment. After being treated by LY294002, the expression levels of p-AKT and FoxM1 were down-regulated markedly. In conclusion, curcumin can inhibit cell proliferation and induce apoptosis in gastric cancer stem cells via the ATK/FoxM1 signaling pathway.     

Smad1 在胃腺癌组织中的表达及对胃腺癌细胞迁移能力的影响研究

目的:研究Smad1 在胃腺癌组织中的表达及对胃腺癌细胞迁移能力的影响。方法:提取收集的胃腺癌组织 及对应的癌旁组织中的蛋白,Western blot 检测Smad1 的表达水平。以胃腺癌细胞HGC-27 为研究对象,细胞转染过表达 Smad1 的载体(p-EGFP-C1/ Smad1)和Smad1 小干扰RNA(Smad1 siRNA),同时转染p-EGFP-C1 和siRNA control 为对照。细胞 划痕实验检测细胞迁移能力。Western blot 检测细胞中MMP-9、MMP-2、p-Akt、Akt 的表达水平。Akt 信号通路抑制剂 LY294002(20μg/ ml)作用于胃腺癌细胞HGC-27,MTT 检测细胞增殖情况,细胞划痕实验检测细胞迁移能力。Western blot 检 测MMP-9、MMP-2、p-Akt、Akt 蛋白表达水平。结果:胃腺癌组织中Smad1 的水平明显低于癌旁组织(P<0.01)。p鄄EGFP鄄C1/ Smad1 组细胞存活率和迁移率均明显低于p-EGFP-C1 组(P<0.01)。Smad1 siRNA 组细胞存活率和迁移率均明显高于siRNA control 组(P <0.01)。p-EGFP-C1、p-EGFP-C1/ Smad1、siRNA control、Smad1 siRNA 组细胞中Akt 蛋白表达水平没有变化。 p-EGFP-C1/ Smad1 组细胞MMP-9、MMP-2、p-Akt 蛋白表达水平明显低于p-EGFP-C1 组(P<0.01)。Smad1 siRNA 组细胞MMP鄄 9、MMP-2、p-Akt 蛋白表达水平明显高于siRNA control(P<0.01)。胃腺癌细胞与Akt 信号通路抑制剂作用后细胞增殖和迁移 趋势与p-EGFP-C1/ Smad1 组一致。结论:Smad1 在胃腺癌组织中低表达。Smad1 能够抑制胃腺癌细胞增殖和迁移,作用机制 与Akt 信号通路有关。     

Effect of bone morphogenetic protein-2 on proliferation and apoptosis of gastric cancer cells

Objective: To investigate the effects of bone morphogenetic protein-2 (BMP-2) on the proliferation, differentiation and apoptosis of normal human gastric mucosal cells and gastric cancer cells.Methods: Poorly differentiated gastric cancer BGC823 cells, moderately differentiated gastric cancer cells and normal human gastric mucosal epithelial GES-1 cells were independently treated with recombinant human BMP-2 or its inhibitor Noggin. MTT assay was performed to detect the proliferation, flow cytometry done to measure the cell cycle and apoptosis and immunohistochemistry carried out to determine the expression of cyclin-dependent kinase 4 (CDK4).Results: BMP-2 exerted inhibitory effect on the growth of all types of cells and the inhibition become more evident with the increase of BMP-2 dose. After treatment with 200 ng/ml BMP-2, cancer cells arrested in G1 phase and those in S phase reduced. Gastric cancer cells had higher CDK4 expression than GES-1 cells. BMP-2 decreased CDK-4 expression in cancer cells but had no influence in GES-1 cells. Noggin conferred promotive effect on the growth of 3 types of cells. In 2 types of cancer cells, treatment with 2000 ng/ml Noggin significantly increased the proportion of cells in S phase but reduced that in G1 phase. However, Noggin did not affect the cell cycle of GES-1 cells. The CDK4 expression was markedly increased in 2 types of cancer cells but that of GES-1 remained unchanged after treatment with 2000 ng/ml Noggin.Conclusions: BMP-2 may inhibit the proliferation of both normal and malignant gastric epithelial cells, down-regulate CDK4 expression in gastric cancer cells and arrest gastric cancer cells in G1-phase in cell cycle. Through antagonizing BMP-2, Noggin, may accelerate the proliferation of gastric cancer cells. Thus, the abnormality of BMP signaling pathway may play an important role in the pathogenesis of gastric cancer.     

Dickkopf-1沉默通过下调β-catenin水平抑制胃癌细胞侵袭及上皮-间充质转化

目的:探讨分泌蛋白Dickkopf-1(DKK1)在人胃癌细胞中的表达及其对胃癌细胞侵袭能力的影响。方法:以real-time PCR和Western blot法检测DKK1在人胃黏膜细胞(GES-1)和胃癌细胞(MKN-45和SGC-7901)中的表达水平;以RNA干扰法沉默DKK1,沉默效果以real-time PCR、Western blot及ELISA法验证;Transwell实验检测细胞侵袭能力,以丝裂霉素C抑制细胞增殖;real-time PCR及Western blot法检测细胞E-钙黏蛋白(E-cadherin)、N-钙黏蛋白(N-cadherin)、波形蛋白(vimentin)及β-连环蛋白(β-catenin)水平。结果:DKK1在MKN-45和SGC-7901细胞中的表达明显高于GES-1细胞,表明DKK1在胃癌细胞中表达显著升高;DKK1在MKN-45和SGC-7901细胞中被成功沉默后,细胞侵袭能力显著下降,并具有时间依赖性,同时伴随E-cadherin表达增高及N-cadherin和vimentin表达下降,表明DKK1沉默能够显著抑制胃癌细胞侵袭和上皮-间充质转化(epithelial-mesenchymal transition,EMT);经外源性重组DKK1(r DKK1)转染肿瘤细胞后,进一步证实DKK1具有促胃癌细胞侵袭的作用,并可促进EMT进程;DKK1沉默通过下调β-catenin水平来实现其对胃癌细胞侵袭及EMT的抑制作用。结论:DKK1在人胃癌细胞中表达显著增高,且DKK1沉默能够通过下调β-catenin水平抑制胃癌细胞侵袭及EMT过程。     

转酮酶样蛋白1在人类鼻咽癌细胞生长增殖中的作用

目的:探讨转酮酶样蛋白1(TKTL1)在体外培养的人类鼻咽癌细胞生长增殖中的作用.方法:构建针对TKTL1 mRNA 的干扰RNA质粒,转染人类鼻咽癌细胞(CNE细胞系);检测转染前后CNE细胞中转酮酶活性的变化;实时定量RT-PCR检测转染前后CNE细胞转酮酶基因家族(TKT、TKTL1、TKTL2)mRNA表达水平的变化;通过流式细胞术和MTT实验检测转染前后CNE细胞增殖和细胞周期的改变.结果:实验组CNE细胞中转酮酶活性(携带有pEGFP-C1-U6/TKTL1)明显低于质粒对照组(携带有pEGFP-C1-U6/UC)和空白对照组(未转染细胞);实时定量RT-PCR结果显示转染前后CNE细胞中TKT和TKTL2 mRNA的表达水平均无显著差异.然而,实验组细胞中TKTL1的表达水平明显低于对照组,且实验组CNE细胞增殖明显被抑制,癌细胞被阻滞在G0/G1期.结论:转酮酶蛋白TKTL1在人类鼻咽癌细胞的生长增殖中起重要作用,TKTL1可能成为肿瘤治疗研究的新靶点.     

Effect of miR-340 on gastric cancer cell proliferation and apoptosis

Gastric cancer pathogenesis is a multi-factor, multi-step, complicated process that related to gene abnormal expression. This study intended to explore the miR-340 effect on human gastric cancer cell line SGC-7901 and BGG823 proliferation and apoptosis, as to provide theoretical basis and experimental evidence for potential clinical application. Array was used to screen gastric cancer related abnormal genes. Q-PCR was applied to detect the screened genes expression in tissue and gastric cancer cells. MTT and colony formation assay were performed to evaluate miR-340 impact on gastric cancer proliferation. Flow cytometry was used to determine cell cycle and cell apoptosis. Q-PCR showed that miR-340 overexpressed in gastric cancer tissue significantly compared with normal control (P < 0.01). MiR-340 overexpression can promote SGC-7901 and BGC823 cells proliferation with 50% proliferation rate. Soft agar colony formation assay also showed that miR-340 overexpression can facilitate gastric cancer cell proliferation. Cell cycle analysis revealed that miR-340 overexpression can reduce cell apoptosis. Annexin V/PI staining demonstrated that miR-340 transfection can decrease cell apoptotic rate (4.58%, 1.98%, 2.11%). MiR-340 can promote tumor cell growth and reduce cell apoptosis effectively.     

RNA 干扰抑制BAG-1 基因表达对皮肤鳞状细胞癌增殖及凋亡的影响研究

目的:探讨抑制BAG-1(Bcl-2-associated athanogene-1)基因表达对皮肤鳞状细胞癌增殖及凋亡的影响。方法:采用LipofectamineTM2000 将BAG-1 的siRNA 转染皮肤鳞状细胞癌A431,转染后48 h,RT-PCR 检测BAG-1 的mRNA 表达,Western blot 检测BAG-1 的蛋白表达;CCK8 和流式细胞仪分别检测细胞增殖和凋亡情况;Western blot 检测B 细胞淋巴瘤/ 白血病-2(Bcl-2)家族促凋亡蛋白Bcl-2 相关X 蛋白(Bax)及Wnt/β-catenin 信号通路β-连环蛋白(β-catenin)、Survivin 的蛋白表达;ELISA 试剂盒检测白介素6 (IL-6)、血管内皮生长因子(VEGF)含量。结果:与空白组和阴性对照组比较,转染BAG-1 的siRNA 可明显抑制BAG-1 在转录和翻译水平上的表达;与空白组较,BAG-1-siRNA 组细胞增殖显著降低,细胞凋亡率显著增加,Bax 蛋白表达上调, β-catenin、Survivin 蛋白表达下调,IL-6、VEGF 含量均显著降低(P<0.05)。结论:BAG-1 表达沉默可降低皮肤鳞状细胞癌增殖,促进细胞凋亡,上调Bax 及下调Wnt/ β-catenin 信号通路表达,降低IL-6、VEGF 因子的分泌。