CO2气腹对结直肠癌细胞增殖及microRNA-221和CDKN1C/p57表达的影响

目的:通过检测不同压力CO2气腹环境下结直肠癌细胞周期和microRNA-221(miR-221)及CDKN1C/p57表达的变化,探讨CO2气腹对结直肠癌细胞增殖的影响.方法:将人结直肠癌CaCO2细胞系分别置于0、10、12和15mm Hg的CO2气腹环境下培养4h,应用实时荧光定量PCR检测CaCO2细胞中miR...     

miR-338-5p在结直肠癌组织中的表达及其对结肠癌细胞增殖的影响

目的探讨miR-338-5p在结直肠癌组织中的表达状况,以及miR-338-5p过表达对结肠癌细胞系HCT116和SW620增殖、凋亡及细胞周期的影响。方法使用实时定量PCR方法检测miR-338-5p在40例临床诊断为结直肠癌患者配对癌组织及癌旁组织中的表达情况。随后使用miR-338-5p-mimics转染结肠癌细胞系HCT116和SW620,确认过表达成功后,分别使用CCK-8法、FITC-AnnexinV．PI法及Propidiumiodide法检测肿瘤细胞的增殖、凋亡和细胞周期的改变。结果①miR-338-5p在结直肠癌组织中的表达明显低于其在相应的癌旁组织中的表达（P〈0．01）。②与转染阴性对照比较,转染miR-338．5p．mimics后,HCT116和SW620细胞增殖能力明显减弱（P〈0．01）,凋亡率明显增加[HCT116细胞：（11．43±0．67）％比（7．98±0．36）％,P〈0．01;SW620细胞：（10．5±0．2）％比（7．93±0．5）％,P〈0．01],诱导HCT116和SW620细胞G1期阻滞[HCT116细胞：（80．41±1.34）％比（64．87±1．83）％,P〈0．01;SW620细胞：（68．76±0．41）％比（54．89±0．78）％,P〈0．01]。结论miR-338-5p可能作为抑癌基因在结直肠癌中发挥作用,并对细胞增殖、凋亡和周期有显著影响。     

结直肠癌组织中miR-142-3p及RAC1基因的表达及其意义

目的 研究结直肠癌组织中miR-142-3p、RAC1基因及蛋白的表达与临床病理特征的关系,并探讨miR-142-3p及RAC1二者表达的相关性.方法 用实时荧光定量PCR技术测定50例结直肠癌组织及其对应的正常黏膜组织中miR-142-3p和RAC1mRNA的表达;用免疫组化SP法检测RAC1蛋白的表达.结果 结直肠癌组织中miR-142-3p的表达低于对应的癌旁组织[-(0.714±2.876)比-(2.116±3.179),Z=-2.882,P=0.004];RAC1 mRNA表达显著高于癌旁组织[(8.973±1.940)比(10.093±2.069),Z=-4.204,P=0.000].miR-142-3p的表达与结直肠癌的淋巴结转移和临床分期有关(均P＜0.05),而与患者的性别、年龄、肿瘤大小、肿瘤位置、浸润深度、组织分化程度、有无远处转移等无关(均P ＞0.05);RAC1 mRNA的表达与结直肠癌患者的分化程度、淋巴结转移、远处转移及临床分期有关(均P ＜0.05),而与性别、年龄、肿瘤位置、肿瘤大小、浸润深度无关(均P＞0.05);RAC1蛋白的表达与肿瘤的分化程度、淋巴结转移、远处转移及临床分期有关(P＜0.05),而与其他临床病理特征无关.miR-142-3p的表达与RAC1 mRNA的表达无相关性(P＞0.05),而与RAC1蛋白的表达存在负相关(P＜0.05).结论 在结直肠癌组织中RAC1mRNA及RAC1蛋白高表达和miR-142-3p的低表达可能与其预后有关.     

miR-221在甲状腺乳头状癌中的表达及其生物学功能

背景与目的:microRNA(miRNA)异常表达与恶性肿瘤的发生发展密切相关,部分miRNA表达与甲状腺乳头状癌(PTC)侵袭性临床病理特征具有明确的相关性。本研究探讨miR-221在PTC中的表达情况及其对PTC细胞生物学行为的影响。方法:通过qPCR技术检测51对PTC癌组织及癌旁组织手术标本中miR-221的表达情况,并通过实时荧光定量RT-PCR检测甲状腺乳头状癌K1细胞miR-221的表达,将PTC K1细胞分别转染miRNA随机序列(阴性对照组)和miR-221抑制物(miR-221抑制物组)后,以无处理的K1细胞为空白对照,分别用MTT比色法检测细胞增殖,流式细胞术分析细胞周期、细胞凋亡率,Transwell小室检测细胞侵袭力。结果:miR-221在PTC癌组织中的相对表达量均明显高于癌旁组织的相对表达量(P0.05)。与空白对照组比较,miR-221抑制物组K1细胞增殖能力明显降低,细胞凋亡率明显增加,G_0/G_1期细胞比例明显升高,而G_2/M期细胞的比例明显降低,细胞侵袭能力明显降低,差异均有统计学意义(均P0.05)。阴性对照组与空白对照组间以上指标差异均无统计学意义(均P0.05)。结论:miR-221在PTC中的表达升高,且可能通过调节细胞周期与凋亡而影响PTC细胞的增殖与侵袭能力。miR-221有作为PTC早期诊断与治疗的生物标志物的潜在价值。     

微小RNA-126在食管鳞癌中的表达及作用机制

目的 观察微小RNA-126(miR-126)在食管鳞癌组织中的表达及其可能调控的靶基因.方法 采用实时定量反转录聚合酶链反应(RT-qPCR)法,检测75例患者食管鳞癌组织和其匹配的癌旁组织中miR-126的表达水平,应用软件预测miR-126的靶基因,免疫组织化学法分析靶蛋白在癌组织中的表达,在食管鳞癌细胞中提高或降低miR-126表达水平,验证其对靶基因的调控作用.结果 对75组配对标本分析,癌组织中miR-126的相对表达量为0.28±0.32,癌旁组织为0.45±0.47,差异有统计学意义(P＜0.01);miR-126低表达与食管鳞癌分化程度、淋巴结转移、肿瘤浸润深度和临床分期相关(P＜0.05);胰岛素受体底物-1(IRS-1)在食管鳞癌组织中过表达,与肿瘤分化程度有关(P＜0.01);上调食管鳞癌细胞Eca9706、Eca109、TE-1中miR-126的表达会导致IRS-1蛋白的表达量(0.785±0.337、1.873±0.684、1.938±1.081)较空白组(1.188±0.336、2.756±1.097、3.028±0.789)下降(P＜0.01),下调食管鳞癌细胞中miR-126的表达会导致IRS-1蛋白的表达量(2.543±0.610、5.182±1.897、5.940±0.997)相对升高(P＜0.01).结论 食管鳞癌组织中miR-126表达水平下降,IRS-1蛋白的表达受miR-126的负调控,IRS-1可能是miR-126在食管鳞癌中发挥抑癌基因功能的靶基因之一.     

microRNA-497 在肝细胞癌中的表达及意义

目的:探讨microRNA-497(miR-497)在肝细胞癌组织中的表达及其意义.方法:收集40例肝细胞癌及对应癌旁组织标本,用qRT-PCR方法检测标本中miR-497的表达;人肝癌SMMC-7721细胞经miR-497模拟物转染后,用MTT和流式细胞术检测其增殖能力与凋亡水平的变化,并用qRT-PCR和Western blot检测miR-497潜在靶点Bcl-w的mRNA与蛋白的表达.结果:miR-497在肝癌组织中的表达水平明显低于其癌旁组织[(1.181±0.779)vs.(14.599±5.266),P＜0.05];转染miR-497模拟物的SMMC-7721细胞增殖能力明显降低,细胞凋亡增加,Bcl-w的mRNA与蛋白表达均明显降低(与未转染的SMMC-7721细胞比较,均P＜0.05).结论:肝癌组织中miR-497表达下调,该下调可能导致靶基因Bcl-w表达升高,从而促进肿瘤的发生与发展.     

miR-562靶向调控FGFR1对结直肠癌细胞迁移及侵袭的影响

目的探究微小RNA 562(miR-562)调控成纤维细胞生长因子受体1(FGFR1)对结直肠癌细胞迁移及侵袭的影响。方法选取2019年10月至2020年10月十堰市人民医院(湖北医药学院附属人民医院)25例行手术切除术的结直肠癌患者, 获取其结直肠癌组织及肿瘤边缘>5 cm处正常癌旁组织样本。实时荧光定量PCR(qRT-PCR)法检测癌旁组织、结肠癌组织、人正常结直肠细胞(FHC细胞)和人结直肠癌细胞系(SW480、SW620、HT29及HCT116细胞)中miR-562的表达。将SW480细胞分为对照组、miR-NC组、miR-562 mimics组、miR-562 mimics+pcDNA3.1组、miR-562 mimics+pcDNA3.1-FGFR1组。CCK-8法检测SW480细胞增殖;Transwell法检测SW480细胞侵袭迁移;双荧光素酶报告基因检测miR-562和FGFR1靶向关系;Western blot检测SW480细胞中FGFR1、细胞周期蛋白D1(CyclinD1)、基质金属蛋白酶2(MMP2)的表达情况。结果与癌旁组织相比, 结肠癌组织中miR-5...     

微小RNA-124通过靶向激活的蛋白激酶C受体1对胃癌细胞增殖、周期和凋亡的影响

目的观察微小RNA(miRNA, miR)-124通过靶向激活的蛋白激酶C受体1(RACK1)对胃癌细胞增殖、周期和凋亡的影响。方法选取2020年6月至2022年6月收集的76例胃癌组织和癌旁组织作为研究对象, 采用荧光定量聚合酶链反应(PCR)分析肿瘤组织和癌旁组织miR-124表达水平。采用慢病毒介导对照miRNA和miR-124感染人胃癌细胞系BGC-823, 分为对照miRNA和miR-124组, 分别采用细胞计数试剂(CCK-8)和EdU染色分析细胞增殖, 流式细胞术分析两组细胞的周期和凋亡;采用生物信息学和双荧光素酶报告基因分析miR-124的靶基因;蛋白质印迹法(Western blot)分析肿瘤组织和细胞靶基因表达及其周期和凋亡蛋白表达。组间比较采用t检验。结果癌旁组织miR-124表达水平(1.06±0.22)明显高于胃癌组织(0.56±0.13), 差异有统计学意义(t=16.940, P<0.05)。对照miRNA组细胞48 h吸光值A(2.09±0.13)明显高于miR-124组(1.36±0.11), 差异有统计学意义(t=10.660, P<0....     

微小RNA-195靶向调控Delta样配体4抗结直肠癌分子机制研究

目的:观察微小RNA(microRNA,miR)-195调控结直肠癌中Notch通路配体Delta样配体4(Dll4)表达,探讨其作用靶点,明确miR-195通过Notch通路抗结直肠癌的分子机制。方法:收集北京大学人民医院胃肠外科2010年11月至2011年2月56例行结直肠癌根治术切除的标本,3、应用芯片技术筛选6...     

miR-1246在肝癌组织中的表达及其对人肝癌细胞增殖和凋亡的影响

目的 观察微小RNA-1246（miR-1246）在肝癌组织中的表达及其对人肝癌细胞增殖和凋亡的影响,探讨其在肝癌发生发展中的作用和意义。方法应用实时定量PCR（qRT-PCR）方法检测miR-1246在肝癌以及癌旁组织的表达;对人肝癌细胞株（BEL7402、SMMC7721）转染miR-1246 抑制剂后,采用MTT法观察肝癌细胞的增殖活性,流式细胞仪检测细胞凋亡的变化。结果 miR-1246 在肝癌组织中表达显著高于癌旁组织[（65.39±8.77）vs（10.23±2.58）,P=0.002]。MTT和凋亡实验结果显示,与阴性对照组相比,转染miR-1246抑制剂后,BEL7402细胞增殖能力下降,凋亡增加（P均＜0.05）;SMMC7721细胞也出现增殖能力下降,凋亡增加（P均＜0.05）。结论 miR-1246 在肝癌组织中高表达,并且与肝癌细胞的增殖及凋亡有关,其表达的上调可能与肝癌的发生发展有关。     

Expression and role of microRNA-155 in db/db mice

Objective To investigate the expression of microRNA-155 (miR-155) in serum and kidney of C57BLKS/db (db/db) mice and its role in the pathogenesis of diabetic kidney disease (DKD). Methods The db/db mice (n=24) were divided into 6, 8, and 10 weeks old groups (n=8) with age increasing according to the random number table, and C57BL/6 mice of the same age were used as control group. The expression of miR-155 in mouse serum and kidney tissue was determined using real-time quantitative PCR. The mRNA and protein expression of Ets-1, eNOS, AGTR1 in renal tissues was verified by real-time quantitative PCR, Western blotting and immunohistochemistry. Results Compared with the control group, the expression of miR-155 in serum of db/db mice at 6, 8 and 10 weeks of age were significantly increased (all P＜0.01), and the increase of miR-155 was most obvious at 10 weeks of age (P＜0.01). Meanwhile the expression of miR-155 in kidney tissues of 6, 8 and 10 weeks old db/db mice was significantly up-regulated (all P＜0.01), and the highest expression of miR-155 was at 10 weeks of age (P＜0.01). Immunohistochemistry showed that Ets-1, eNOS and AGTR1 were localized in glomerular endothelial cells. The results of real-time quantitative PCR showed that the mRNA expression of Ets-1, eNOS and AGTR1 were down-regulated in the kidney tissues of db/db mice at 6, 8 and 10 weeks of age compared to the control(all P＜0.05), and the level of down-regulation was the most obvious at 10 week. Western blotting results showed that there was no significant change in Ets-1, eNOS and AGTR1 in 6-week-old db/db mice compared to the control group; the eNOS protein expression was down-regulated at 8 weeks of age (P＜0.05); the expression of AGTR1 protein was down-regulated (P＜0.05), and the protein expression of Ets-1 and eNOS were significantly down-regulated at 10-week age (both P＜0.01). Conclusions The expression of miR-155 in serum and kidney tissues of db/db mice increases during the progression of DKD, while the expression of miR-155 target genes Ets-1, eNOS and AGTR1 decreases with the progression of DKD. MiR-155 may participate in the development and progression of DKD by inhibiting its target genes Ets-1, eNOS and AGTR1, affecting endothelial cell function.     

微小RNA-205-5p调控轴抑制蛋白2基因表达对结肠癌细胞增殖凋亡的影响及作用机制的临床研究

目的:探讨微小RNA(microRNA,miR)-205-5p靶向调节轴抑制蛋白2(AXIN2)基因表达对结肠癌细胞增殖凋亡的影响及作用机制。方法:收集2017年1月至2019年1月山西省人民医院手术切除结肠癌组织组织标本并购买结肠癌细胞系,分别以距肿瘤边缘5 cm的癌旁组织和人正常结肠黏膜上皮细胞系为对照。实时定量反...     

MicroRNA-124 inhibits rho associated kinase 1 activity to ameliorate the damages of glomerular endothelial cells caused by high glucose

Objective To explore the effects of miR-124-ROCK1 signal pathway in the damages of glomerular endothelial cells (GEnCs) induced by high glucose. Methods Rat glomerular endothelial cells were cultured in different glucose concentrations: normal control group (NG: 5.5 mmol/L), high glucose group (HG: 30.0 mmol/L), and cells were treated with ROCK1 inhibitor Y27632, miR-124-3p mimic, miR-124-3p inhibitor. The expressions of ROCK1 activity, cell apotosis and tight junction proteins were detected by Western blot. The cell tight junction protein ZO-1 in those groups were assessed by laser scanning confocal microscope. Results High glucose significantly decreased miR-124 expression (P＜0.01), ROCK1 activity (P-MYPT1/MYPT1), and cell apoptosis (Cleaved-Caspase3/pro-Caspase3) were found increased while the tight junction proteins ZO-1and Occludin were found decreased in these cells (P＜0.05 all P＜0.01), However, when pretreated cells with ROCK1 inhibitor Y27632, these injuries were significantly reversed. In cells transfected with miR-124-3p mimic, p-MYPT1/MYPT1 was decreased. p-MYPT1/MYPT1 was however increased in cells transfected with miR-124-3p inhibitor (P＜0.05), indicating that miR-124 could directly inhibit ROCK1 activity. The increased ROCK1 activity and apoptosis, as well as the decreased tight junction proteins induced by high glucose were significantly suppressed as miR-124-3p mimic transfected in GEnCs. Conclusions According to our experiments, high glucose suppressed miR-124 in glomerular endothelial cells, consequenctly activating ROCK1 activity to damage endothelial cells. MiR-124 overexpression could ameliorate these damages induced by high glucose, suggesting that miR-124 might be a new therapeutic target to prevent glomerular endothelial cells injuries in diabetic nephropathy.     

miR-195对胃癌BCG823细胞株增殖与凋亡的影响

目的 观察miR-195对胃癌细胞BCG823增殖与凋亡的影响。方法 利用阳离子脂质体LipofectamineTM2000将miR-195的模拟物转染入BCG823细胞中。Real-time聚合酶链反应(PCR)法测定BCG823内miR-195的表达。CCK8法测定细胞生长曲线观察细胞增殖的抑制。流式细胞仪测定细胞凋亡率的变化。JC-1染色检测线粒体膜电位变化。Caspase活性检测试剂盒检测Caspase-3、Caspase-8、Caspase-9的活性。结果 对照组24、48、72h吸光值分别为0.214、0.236、0.510、0.702,而转染组24、48、72 h吸光值分别为0.222、0.224、0.330、0.504,转染组凋亡率为21.84％,较对照组(4.24％)显著增加,转染组线粒体电位4.3,较对照组(13.8)显著降低(P＜0.05)。对照组Caspase-3、Caspase-9、Caspase-8活性分别为0.265±0.029、0.652±0.042、0.244±0.047,而转染组Caspase-3、Caspase-9、Caspase-8活性分别为0.504±0.039、0.214±0.037、0.262±0.032。miR-195能使Caspase-3、Caspase-9的活性增加,Caspase-8的活性无显著变化。结论 体外实验初步证明miR-195基因可抑制胃癌细胞株BCG823增殖并诱导其凋亡。     

MS-275阻断STAT3信号通路诱导U251细胞凋亡

目的 探讨组蛋白去乙酰化酶抑制剂MS-275对脑胶质瘤细胞株U251细胞增殖的影响及促凋亡机制.方法 以不同药物浓度梯度和U251细胞分别共培养24、48、72 h后,应用CCK-8法检测肿瘤细胞增殖,瑞氏-姬姆萨染色法观察细胞形态变化,PI单染法检测细胞周期,Annexin V-FITC/PI法经流式检测细胞凋亡率,免疫印迹检测STAT3蛋白和PARP蛋白表达.结果 MS-275能显著抑制U251细胞的增殖,药物浓度40 nmol/ml,培养72 h,抑制率为(79.0±1.7)%;经药物作用后,细胞呈现凋亡形态,胞质和胞核浓缩或碎裂;G0/G1期细胞由(66.320±0.456)%降至(38.288±1.242)%(P＜0.01),G2/M期细胞由(19.940±0.580)%升高至(35.650±0.507)%,而后降至(22.343±1.224)%(P＜0.01),亚G0凋亡峰由(0.230±0.035)%增高至(18.393±1.449)%(P＜0.01);总凋亡率由(2.133±0.416)%增高至(29.000±2.307)%(P＜0.01);免疫印迹检测提示磷酸化STAT3表达水平降低,PARP被剪切.结论 MS-275对胶质瘤细胞的增殖抑制作用具有浓度和时间依赖性,它通过阻断STAT3磷酸化,诱导激活Caspase-3凋亡途径.

Abstract：

Objective To investigate the effect of MS-275 on the proliferation of brain glioma cells. Methods U251 cells were respectively cultured for 24, 48, 72 h, with different concentrations of MS-275. CCK-8 assay was used to assess the proliferation of U251 cells. The morphological changes of U251 cells were observed by Wright-Giemsa staining. The cell cycle was analyzed by PI dyeing. The apoptosis rate was assayed by flow cytometry using annexin V-FITC/PI. The protein expression of STAT3 and PARP was detected by Western blotting. Results MS-275 could significantly inhibited proliferation of U251 cells. After treatment with MS-275, apoptosis of U251 cells was seen; The ratio of G0/G1 was decreased from ( 66.320 ± 0.456 ) % to ( 38. 288 ± 1. 242 ) % ( P ＜ 0. 01 ), the percentage of G2/M cells was increased from ( 19. 940 ± 0. 580 ) % to ( 35.650 ± 0. 507 ) %, then decreased to ( 22. 343 ± 1. 224 ) %(P＜0.01), and ratio of sub-G0 was increased from (0.230 ±0.035)% to (18.393 ±1.449)% (P＜0. 01 ); Total apoptosis rate was increased from ( 2. 133 ± 0.416 ) % to ( 29. 000 ± 2. 307 ) % ( P ＜ 0. 01 );The expression level of phosphorylated STAT3 was significantly downregulated, and the cleavage of PARP was detected by Western blotting. Conclusion MS-275 inhibites proliferation of brain glioma cells in a time- and dose-dependent manner, which is achieved by inducing apoptosis.