miR-21在辐射敏感性不同的3种乳腺癌细胞株中的表达差异及意义

目的:研究miR-21在MDA-MB-435S、MCF-7、MDA-MB-231这3种辐射敏感性不同的乳腺癌细胞株中表达量的差异及其意义。方法:①采用实时定量PCR法分别检测3种乳腺癌细胞株中miR-21的表达量的差异。②时程关系:在3Gy的X射线分别照射3种乳腺癌细胞株后,分别于0、4、8、12、24 h,进行实时荧光定量PCR检测其miR-21的表达量。结果:①miR-21在MDA-MB-435S细胞株的表达量最低,在MCF-7型细胞株中的表达量处于中间水平,在MDA-MB-231型细胞株中的表达量最高。②时程关系:miR-21在MDA-MB-231型细胞株受照后表达量逐渐升高,在12 h达到峰值,24 h后基本恢复至照前水平;miR-21在MCF-7型细胞株受照后,表达量也逐步升高,8 h达到峰值,24 h后基本恢复至照前水平;mir-21在MDA-MB-435S型细胞株受照后,表达量一路下降,8 h达到最低值,24 h后,其表达量仍明显低于照前水平。结论:miR-21的表达量与乳腺癌细胞的辐射敏感性成反比。     

微小核糖核酸-371a-5p靶向调控X相关凋亡抑制蛋白在滋养层细胞凋亡和复发性流产中的作用分析

目的探讨微小核糖核酸-371a-5p(miR-371a-5p)靶向调控X相关凋亡抑制蛋白(XIAP)在滋养层细胞凋亡、复发性流产中的作用。方法滋养层JEG-3细胞经过细胞培养、转染后,分为空白组(Control)、阴性对照组(ND)、miR-371a-5p mimics组及miR-371a-5p inhibitor组。实时荧光定量PCR检测miR-371a-5的表达观察滋养层细胞凋亡能力,免疫印迹(Western blot)检测XIAP、含半胱氨酸的天冬氨酸蛋白水解酶(caspase-3)表达,采用实时荧定量PCR检测XIAP、caspase-3基因。结果Control组miR-371a-5p mRNA表达水平为(1.50±0.09),NC组miR-371a-5p mRNA表达水平为(1.44±0.05),miR-371a-5p mimics组miR-371a-5p mRNA表达水平为(1.23±0.08),miR-371a-5p inhibitor组miR-371a-5p mRNA表达水平为(1.86±0.05),miR-371a-5p mimics组表达低于Control、NC、miR-371a-5pinhibitor组;miR-371a-5p inhibitor组表达高于Control、NC、miR-371a-5p mimics组(F=31.759,P<0.05)。Control组转染48 h后细胞凋亡率为(1.74±0.04)%,NC组转染48 h后细胞凋亡率为(1.76±0.06)%,miR-371a-5p mimics组转染48 h后细胞凋亡率为(3.51±0.09)%,miR-371a-5p inhibitor组转染48 h后细胞凋亡率为(1.33±0.16)%,滋养层细胞转染48 h后miR-371a-5p mimics组细胞凋亡率高于NC、Control及miR-371a-5p inhibitor组;miR-371a-5p inhibitor组低于NC、Control及miR-371a-5p mimics组(F=47.027,P<0.05)。miR-371a-5p mimics组XIAP相对表达量低于NC、Control及miR-371a-5p inhibitor组;miR-371a-5p inhibitor组XIAP相对表达量高于miR-371a-5p mimics、NC及Control组(F=33.541,P<0.05)。miR-371a-5p mimics组caspase-3相对表达量低于NC、Control及miR-371a-5p inhibitor组;miR-371a-5p inhibitor组caspase-3相对表达量高于miR-371a-5p mimics、NC及Control组(F=43.728,P<0.05)。结论miR-371a-5p靶向调控XIAP参与滋养层细胞凋亡的过程,在复发性流产起到重要作用。     

miR-363通过靶向于MCL-1增强顺铂对乳腺癌细胞的杀伤活性

目的探究microRNA-363(miR-363)是否能增强顺铂对乳腺癌细胞的杀伤活性及机制。方法利用生物信息学、定量PCR及Western blot法,验证miR-363能否在体外调节乳腺癌细胞系MDA-MB-231 MCL-1的表达水平;MTT法检测miR-363联合顺铂对乳腺癌细胞系MDA-MB-231的杀伤活性;构建MCL-1真核表达载体,MTT法检测MCL-1表达载体转染对miR-363联合顺铂治疗乳腺癌疗效的影响。结果乳腺癌细胞系MDA-MB-231的miR-363表达水平显著低于正常乳腺细胞系MCF-10A,差异有统计学意义(P0.05)。miR-363转染后,乳腺癌细胞系MDA-MB-231 MCL-1的mRNA表达水平及蛋白表达水平相比于NCO转染组均下降,差异有统计学意义(P0.05)。MTT结果表明,miR-363联合顺铂组对MDA-MB-231细胞的杀伤活性显著高于miR-363组和顺铂组,差异有统计学意义(P0.05)。miR-363联合顺铂在MCL-1表达载体转染后对MDA-MB-231细胞的杀伤活性显著低于未转染MCL-1表达载体的miR-363联合顺铂组,差异有统计学意义(P0.05)。结论 miR-363通过靶向与MCL-1增强顺铂对乳腺癌细胞的杀伤活性。     

扶正合剂联合miR-210对乳腺癌细胞增殖 迁移 侵袭的影响及机制研究

目的 探究扶正合剂联合miR-210对乳腺癌细胞增殖、迁移、侵袭的影响及其机制。方法 体外培养人乳腺癌细胞株MDA-MB-231,采用扶正合剂进行干预。将anti-miR-NC、anti-miR-210分别转染至MDA-MB-231细胞；将miR-NC、miR-210 mimics分别转染MDA-MB-231细胞，再使用扶正合剂处理细胞。CCK-8检测细胞增殖能力，Transwell小室检测细胞迁移和侵袭，实时荧光定量PCR(RT-qPCR)检测miR-210表达，Western blot检测CyclinD1、p21、MMP-2、MMP-9蛋白表达。结果 与正常对照组(0.56±0.05)比较，乳腺癌细胞组OD值明显上调，为(0.96±0.09),差异有统计学意义(t=11.655,P=0.000);与乳腺癌细胞组比较，扶正合剂组OD值显著降低，为(0.32±0.03),差异有统计学意义(t=20.239,P=0.000)。正常对照组迁移细胞数、侵袭细胞数、MMP-2蛋白及MMP-9蛋白表达水平分别为(62.31±5.30)个、(70.33±8.26)个、(0.25±0.02)、(0....     

PTEN抑制乳腺癌细胞MDA-MB-231体外增殖及其机制的探讨

目的:观察PTEN对乳腺癌细胞MDA-MB-231体外增殖和迁移的影响,进一步探讨其可能机制.方法:选用人乳腺癌细胞MDA-MB-231并体外培养,质粒转染技术建立过表达PTEN的稳定细胞株MDA-MB-231/PTEN作为实验组,空载体细胞株MDA-MB-231/pcDNA3.1作为阴性对照组,以未转染细胞为正常对照组,RT-PCR检测各组细胞PTEN的表达水平,MTT法检测各组MDA-MB-231细胞的增殖能力,Transwell小室迁移实验检测各组MDA-MB-231细胞的迁移能力.结果:PTEN在MDA-MB-231/PTEN细胞中表达稳定,且其表达量明显高于阴性对照组和正常对照组,而阴性对照组和正常对照组PTEN表达量差异无统计学意义.转染PTEN基因可显著抑制乳腺癌细胞MDA-MB-231的增殖和迁移能力.结论:PTEN与乳腺癌的增殖和迁移有关,对乳腺癌细胞的体外增殖和迁移能力起到抑制作用.     

OPN反义基因对乳腺癌MDA-MB-231细胞迁移能力的影响

目的:探讨OPN反义基因(ANOPN)对人乳腺癌细胞系MDA-MB-231细胞生长及迁移能力的影响。方法:构建人骨桥蛋白反义基因真核表达质粒pcDNA3.1-ANOPN,将质粒pcDNA3.1-ANOPN、空载体pcDNA3.1(+)和等量的脂质体分别转染人乳腺癌细胞系MDA-MB-231,将转染细胞分别命名为MDA-ANOPN、MDA-vect和MDA,在体外观察各组细胞的迁移能力。结果:MDA-MB-231细胞比MDA-vect及MDA细胞迁移能力弱(P<0.01)。结论:ANOPN可抑制人乳腺癌细胞系MDA-MB-231细胞的迁移能力。     

miR-125a-5p在人乳腺癌细胞侵袭和转移中的作用机制研究

目的探讨miR-125a-5p在人乳腺癌细胞侵袭与转移中的作用机制。方法采用荧光定量PCR检测人乳腺细胞MCF-10A和乳腺癌细胞中miR-125a-5p的表达量,利用瞬时转染技术将过表达质粒转染到MDA231中,检测miR-125a-5p质粒在乳腺癌MDA231、MCF-7细胞中的转染效率,利用趋化运动实验与Transwell侵袭试验检测趋化运动能力和运动能力。结果人乳腺癌淋巴结转移、组织分期及雌激素受体均与miR-125a-5p表达水平有关,差异有统计学意义(P<0.05)。miR-125a-5p在MDA231和MCF-7中表达量较MCF-10A中低,差异有统计学意义(P<0.05);MDA231与MCF-7相比,MDA231中表达量更低,差异有统计学意义(P<0.05)。GAB2在MDA231/miR-125a-5p细胞组的表达量低于MDA231组和MDA231/NC组,差异均有统计学意义(P<0.05);在AntimiR-125a-5p/MCF-7组中的表达量高于AntiNC/MCF-7和MCF-7组,差异均有统计学意义(P<0.05)。穿过基质胶...     

Parkin蛋白抑制三阴性乳腺癌MDA-MB-231细胞的有氧糖酵解和增殖迁移

目的 评估Parkin蛋白对乳腺癌MDA-MB-231细胞有氧糖酵解和生长增殖的影响。方法 首先采用Western blot检测Parkin蛋白在人乳腺上皮细胞MCF-10A和乳腺癌MDA-MB-231细胞中的表达。随后构建高表达Parkin的乳腺癌MDA-MB-231细胞株为实验组,以转染空载体的MDA-MB-231细胞为对照组,分别采用葡萄糖、乳酸和ATP检测试剂盒检测两组细胞葡萄糖摄取量,乳酸和ATP生成量,并通过Western blot检测糖酵解相关蛋白GLUT1、PKM2和LDHA表达水平;运用细胞增殖实验、平板克隆及细胞划痕实验评估细胞的增殖和迁移能力;采用Western blot检测凋亡相关蛋白Bax、Bcl-2和cleaved Caspase-3的表达水平。结果 与MCF-10A细胞相比,MDA-MB-231细胞Parkin蛋白表达水平显著下降（P<0.01）。高表达Parkin可使乳腺癌MDA-MB-231细胞的葡萄糖摄取和乳酸生成下降,ATP水平上升（P<0.05）,其增殖和迁移能力下降（P<0.01）;与对照组相比,Parkin组细胞糖酵解相关蛋...     

miR-26b调控MCF-7细胞MCL-1蛋白的表达并诱导凋亡

目的探讨microRNA-26b(miR-26b)的作用靶点及其对MCF-7细胞的抑制作用。方法通过荧光定量PCR方法及Western blot方法检测正常乳腺细胞系MCF-10A及乳腺癌细胞系MCF-7、MDA-MB-231及MDAMB-435的miR-26b及MCL-1的表达水平。MTT法检测miR-26b转染对MCF-7细胞活力的影响,Annexin V/PI染色法检测miR-26b转染对MCF-7细胞凋亡的影响。通过生物信息学分析预测miR-26b的靶基因,并将miR-26b转染入MCF-7细胞,检测miR-26b对MCL-1表达水平的影响。结果相比于MCF-10A细胞,乳腺癌细胞系MCF-7、MDA-MB-231及MDA-MB-435的miR-26b表达水平均显著下降,同时MCL-1表达水平均显著上升,提示miR-26在乳腺癌中其肿瘤抑制作用可能调节细胞MCL-1的表达。进一步研究发现MCL-1基因的3'-UTR区存在miR-26b的假定结合位点,且在乳腺癌细胞中转染miR-26b后,MCL-1的表达下降。转染miR-26b可抑制MCF-7细胞的活力并诱导其发生凋亡。结论 miR-26b下调MCF-7细胞MCL-1蛋白的表达并诱导其发生凋亡。     

miR-126调控Shh通路抑制卵巢癌细胞增殖的机制研究

目的探讨miR-126对Shh通路活化和卵巢癌细胞增殖的影响,为临床诊疗卵巢癌提供新靶点。方法选取2017年1月-2018年12月在浙江衢化医院病理确诊并进一步行手术切除治疗的卵巢癌患者20例为研究对象,取其癌性组织及其邻近癌旁组织作为组织标本。检测癌性组织及癌旁组织的miR-126相对表达量。转染miR-126mimics、miR-126inhibitor及阴性对照试剂后,检测癌细胞的miR-126相对表达量、Shh蛋白表达量、细胞周期以及癌细胞的增殖活性。结果实时荧光定量PCR检测结果显示,卵巢癌组织中miR-126的相对表达量明显高于癌旁组织(P0.05)。卵巢癌细胞转染后,①mimics组的miR-126相对表达量升高于NC组(P0.05),inhibitor组的miR-126相对表达量低于NC组(P0.05);②与NC组卵巢癌细胞增殖活性比较,inhibitor组卵巢癌细胞增殖活性增高(P0.05),mimics组卵巢癌细胞增殖活性降低(P0.05);③与NC组比较,inhibitor组G1期细胞群体明显增多,S期细胞群体减少,mimics组G1期细胞群体明显减少,S期细胞群体增多(P0.05);④与NC组比较,inhibitor组Shh蛋白表达水平升高(P0.05),mimics组Shh蛋白表达水平(P0.05)。结论卵巢癌与miR-126作用相关,抑制卵巢癌细胞增殖的可能作用机制是miR-126调控Shh通路抑制癌细胞生长。     

三氧化二砷对人三阴性乳腺癌细胞株MDA-MB-231教化单核细胞的影响

目的探讨三氧化二砷(As2O3)对人三阴性乳腺癌细胞株MDA-MB-231教化单核细胞的影响。方法于体外分别用不同浓度的As2O3处理MDA-MB-231细胞,采用酶联免疫吸附试验(ELISA)法检测巨噬细胞集落刺激因子1(CSF1)表达水平的差异,利用Transwell共培养体系检测不同浓度As2O3处理组MDAMB-231细胞对人单核细胞株U937趋化能力的差异。结果As2O3能下调MDA-MB-231细胞CSF1的表达,且呈现浓度依赖性(P<0.01);Transwell共培养体系显示,As2O3能减弱MDA-MB-231细胞对人单核细胞株U937的趋化作用。结论As2O3可通过下调CSF1的表达而抑制三阴性乳腺癌细胞株MDA-MB-231对人单核细胞株U937的趋化作用,且呈浓度依赖性。     

雌马酚通过抑制核转录因子-κB表达水平诱导人乳腺癌MDA-MB-231细胞凋亡

目的研究雌马酚对雌激素受体表达阴性的人乳腺癌细胞株MDA-MB-231的作用。方法用MTT法测定雌马酚干预对MDA-MB-231细胞活力的影响;光学显微镜观察雌马酚对细胞形态的影响;流式细胞术及免疫细胞化学法检测雌马酚对细胞凋亡的作用。结果雌马酚可以抑制MDA-MB-231细胞的活力(P<0.05)。雌马酚可抑制NF-κB的表达而诱导细胞凋亡。结论雌马酚可通过降低NF-κB的表达诱导MDA-MB-231凋亡。     

Twist及其相关调控基因在不同转移性人乳腺癌细胞中的差异表达

目的:观察不同转移潜能人乳腺癌细胞株中Twist及其相关调控基因mRNA表达的差异。方法:培养低侵袭性人乳腺癌细胞株MCF-7和高转移性人乳腺癌细胞株MDA-MB-435S,采用RT-PCR法检测两种细胞株中Twist、脆性组氨酸三联体(FHIT)、皮性钙黏附素(E-cadherin)、细胞凋亡相关基因Mcl-1、Bcl-2和Bax mRNA表达的差异。结果:MCF-7中FHIT、E-cadherin、Bax mRNA的表达显著高于MDA-MB-435S细胞,Twist mRNA在MDA-MB-435S细胞中的表达明显高于MCF-7,Mcl-1、Bcl-2 mRNA在两种细胞株中的表达无明显差异。结论:Twist、FHIT、E-cadherin、Bax mRNA表达差异可能与人乳腺癌细胞的不同转移潜能有关。     

Chk1 suppression leads to a reduction in the enhanced radiation-induced invasive capability on breast cancer cells

Radiation therapy is generally effective for treating breast cancers. However, approximately 30% of patients with breast cancer experience occasional post-treatment local and distant metastasis. Low-dose (0.5 Gy) irradiation is a risk factor that promotes the invasiveness of breast cancers. Although an inhibitor of checkpoint kinase 1 (Chk1) suppresses the growth and motility of breast cancer cell lines, no study has investigated the effects of the combined use of a Chk1 inhibitor and radiation on cancer metastasis. Here, we addressed this question by treating the human breast cancer cell line MDA-MB-231 (in vitro) and mouse mammary tumor cell line 4 T1 (in vitro and in vivo) with γ-irradiation and the Chk1 inhibitor PD407824. Low-dose γ-irradiation promoted invasiveness, which was suppressed by PD407824. Comprehensive gene expression analysis revealed that low-dose γ-irradiation upregulated the mRNA and protein levels of S100A4, the both of which were downregulated by PD407824. We conclude that PD407824 suppresses the expression of S100A4. As the result, γ-irradiation-induced cell invasiveness were inhibited.     

放射治疗对乳腺癌患者外周血免疫系统相关指标的影响

目的:研究分析放射治疗对乳腺癌患者免疫系统相关指标的影响。方法:选取在医院就诊的6例病理诊断为乳腺癌Ⅱ~Ⅲ期患者,将所有患者放射治疗前(0 Gy)静脉血样本定义为对照组、放射治疗20 Gy和50 Gy照射后静脉血样本分别定义为20 Gy组和50 Gy组,于放射治疗10次后、25次后采集不同放射治疗累积剂量24 h后静脉血8 ml;采用流式细胞术检测所有受检者不同剂量放射治疗后外周血淋巴细胞亚群百分数、外周血淋巴细胞凋亡及细胞周期的改变;实时荧光定量聚合酶链反应(q RT-PCR)法检测外周血淋巴细胞微小核糖核酸(miRNA)的改变。结果:乳腺癌患者20 Gy组和50 Gy组照射后与对照组比较,淋巴细胞亚群CD3⁺、CD4⁺/CD8-和CD4⁺/CD8⁺表达水平均呈下调趋势,CD4^-/CD8⁺呈上升趋势,但差异均无统计学意义;20 Gy组T细胞抗原受体(TCR)/CD3明显下调,与对照组比较差异有统计学意义(Z=-2.008,P<0.05),50 Gy组TCR/CD3有所回升,但差异无统计学意义。不同剂量的两组照射后乳腺癌患者mi RNA-150、mi RNA-210表达水平随剂量增加呈降低趋势,50 Gy组表达水平明显降低,与对照组相比差异有统计学意义(Z=-2.242,Z=-2.402;P<0.05)。结论:放射治疗未引起乳腺癌患者明显的免疫功能抑制,可能是通过改变mi RNA-150、mi RNA-210的通路而抑制肿瘤的生长。     

Soy Isoflavone Genistein-Mediated Downregulation of miR-155 Contributes to the Anticancer Effects of Genistein

We previously reported that dietary genistein inhibits mammary tumor growth and metastasis of the highly metastatic MDA-MB-435 cancer cells in immunocompromised mice. The purpose herein was to characterize the role of the novel oncogenic microRNA (miRNA) miR-155 in the anticancer effects of genistein in metastatic breast cancer. The effect of genistein was determined on breast cancer cell viability, apoptosis, and expression of miR-155 and its targets. At low physiologically relevant concentrations, genistein inhibits cell viability and induces apoptosis in metastatic MDA-MB-435 and Hs578t breast cancer cells, without affecting the viability of nonmetastatic MCF-7 breast cancer cells. In parallel with reduced cell viability, miR-155 is downregulated, whereas proapoptotic and anticell proliferative miR-155 targets FOXO3, PTEN, casein kinase, and p27 are upregulated in MDA-MB-435 and Hs578t cells in response to genistein treatment. However, miR-155 levels remain unchanged in response to genistein in the MCF-7 cells. Ectopic expression of miR-155 in MDA-MB-435 and Hs578t cells decreases the effects of genistein on cell viability and abrogates the effects of genistein on apoptosis and expression of proapoptotic genes. Therefore, genistein-mediated downregulation of miR-155 contributes to the anticancer effects of genistein in metastatic breast cancer.     

Epigenetic modulation of BRCA1 and BRCA2 gene expression by equol in breast cancer cell lines

S-Equol is a metabolite resulting from the conversion of daidzein, a soya phyto-oestrogen, by the gut microflora. The potential protective effects of equol in breast cancer are still under debate. Consequently, we investigated the effects of equol on DNA methylation of breast cancer susceptibility genes (BRCA1 and BRCA2) and oncosuppressors in breast cancer cell lines (MDA-MB-231 and MCF-7) and in a dystrophic breast cell line (MCF-10a) following exposure to S-equol (2?μm) for 3 weeks. We demonstrated by quantitative analysis of methylated alleles a significant decrease in the methylation of the cytosine phosphate guanine (CpG) islands in the promoters of BRCA1 and BRCA2 after the S-equol treatment in MCF-7 and MDA-MB-231 cells and a trend in MCF-10a cells. We also showed that S-equol increases BRCA1 and BRCA2 protein expression in the nuclei and the cytoplasm in MCF-7, MDA-MB-231 and MCF-10a cell lines by immunohistochemistry. The increase in BRCA1 and BRCA2 proteins was also found after Western blotting in the studied cell lines. In summary, we demonstrated the demethylating effect of S-equol on the CpG islands inside the promoters of BRCA1 and BRCA2 genes, resulting in an increase in the level of expressed oncosuppressors in breast cancer cell lines.     

Involvement of PPARalpha in the growth inhibitory effect of arachidonic acid on breast cancer cells

Epidemiological studies suggest that dietary PUFA may influence breast cancer progression. n-3 PUFA are generally known to exert antitumour effects, whereas reports relative to n-6 PUFA anti-carcinogen effects are controversial. Arachidonic acid (AA; 20:4n-6) and its metabolites have been shown to inhibit the growth of human breast cancer cell lines, even if the downstream mechanisms by which AA may influence carcinogenesis remain unresolved. We explored the molecular basis for AA influence on proliferation, signal transduction and apoptosis in two human breast cancer cell lines, MCF-7 and MDA-MB-231. In both cell lines AA inhibited cell growth in a dose-dependent manner, even if MDA-MB-231 was somewhat more growth-inhibited than MCF-7. AA decreased extracellular signal-regulated protein kinase 1/2 phosphorylation level, and positively modulated PPARgamma and PPARalpha expression, with only a slight effect against PPARbeta/delta. In addition, AA increased Bak (an apoptosis-regulating protein) expression and reduced procaspase-3 and -9 levels only in MDA-MB-231 cells, thus indicating that the growth inhibitory effect can be correlated with apoptosis induction. In both cell lines the use of a specific antagonist made it possible to establish a relationship between AA growth inhibitory effect and PPARalpha involvement. AA decreases cell proliferation most likely by inducing apoptosis in MDA-MB-231 cells, while in the MCF-7 cell line the growth inhibitory activity can be attributed to the inhibition of the signal transduction pathway involved in cell proliferation. In both cases, the results here presented suggest PPARalpha as a possible contributor to the growth inhibitory effect of AA.