miR-106a负调控PTEN促进骨肉瘤细胞增殖并抑制凋亡

目的:研究miR-106a在骨肉瘤组织和MG-63细胞中的表达水平及其对MG-63细胞增殖和凋亡的影响及机制。方法:用荧光实时定量PCR法检测20对骨肉瘤和相邻正常组织及MG-63和成骨细胞hFOB 1.19中miR-106a的表达。用miR-106a mimics、miR-106a antagomir 及两者相应的对照物转染MG-63细胞,然后分别用CCK-8法检测四组细胞增殖活性和FCM法检测细胞凋亡率。miR-106a mimics和mimics control与野生型或突变型PTEN 3'-UTR 重组载体共转染后,应用荧光素酶基因报告系统检测miR-106a是否与PTEN基因3'-UTR 结合。利用Western blot技术检测PTEN蛋白在上述四组转染MG-63细胞和骨肉瘤标本中的表达水平。结果:与相邻正常组织（1.19±0.15）相比,肿瘤组织miR-106a的表达水平（2.60±0.86）显著升高;同时,miR-106a在MG-63中的表达水平（2.60±0.92）明显高于hFOB 1.19（1.19±0.39）,以上差异均有统计学意义（P＜0.05）。CCK-8和FCM检测结果显示,与mimics control组相比,miR-106a mimics组的增殖率明显增加,而细胞凋亡率下降;反之,miR-106a antagomir组与antagomir control组相比,增殖率前者低于后者,而凋亡率前者高于后者,上述差异均有统计学意义（P＜0.05）。荧光素酶报告实验显示,miR-106a mimics和wt PTEN 3'-UTR共转染组的荧光强度值明显低于mimics control和wt PTEN 3'-UTR组（P＜0.05）。Western blot发现,与对照组相比,miR-106a mimics组PTEN表达下调,而miR-106a antagomir表达上调;临床标本,肿瘤组织PTEN表达明显低于正常组织,差异均有统计学意义（P＜0.05）。结论:miR-106a在骨肉瘤组织及细胞中过表达,并靶向负调控PTEN表达,促进骨肉瘤细胞增殖并抑制其凋亡,从而发挥促癌作用。因此,miR-106a可为骨肉瘤的诊治提供新的潜在分子靶点。     

Livin反义寡核苷酸对骨肉瘤MG-63细胞活性的影响

目的 探讨Livin在骨肉瘤细胞中的表达及Livin反义寡核苷酸（ASODN）对骨肉瘤细胞活性及功能的影响。方法 设计针对Livin的ASODN序列,根据转染效率评价结果,选择下调作用最强的ASODN序列制备脂质体-寡核苷酸复合物并转染 MG-63 细胞。采用免疫细胞染色法及Western blotting检测转染24 h后MG-63 细胞中Livin的表达情况,CellTiter-Glo法检测转染72 h后MG-63 细胞的增殖情况,划痕法检测ASODN对MG-63细胞迁移能力的影响,流式细胞仪检测转染24 h后 MG-63 细胞的凋亡情况和细胞周期。结果 Livin蛋白主要表达于MG-63细胞的胞质。选用下调作用最强的ASODN转染MG-63细胞后,Livin蛋白表达显著下降;不同浓度Livin ASODN 对 MG-63细胞的增殖及迁移有剂量依赖抑制作用;而ASODN 组的凋亡率明显高于空白对照组和阴性对照组（P＜0.05）。结论 靶向Livin的ASODN可以显著抑制骨肉瘤细胞增殖和侵袭能力并促进其凋亡。     

miRNA-9对骨肉瘤MG-63细胞增殖、凋亡的作用及其机制

目的：通过提高骨肉瘤MG-63细胞miRNA-9的表达,探讨miRNA-9对MG-63细胞增殖及凋亡的影响及可能的作用机制。方法：MG-63细胞随机分为实验组、阴性对照组和空白组。实验组转染miR-NA-9（ Oligo）,阴性对照组转染阴性对照核苷酸序列（ microRNA negative control sequence）,空白组不做转染。qRT-PCR检测细胞miRNA-9、CXCR4的表达。CCK-8法检测3组细胞的增殖;流式细胞术比较3组细胞的凋亡水平。结果：与阴性对照组和空白组相比,转染组细胞中miRNA-9表达升高;miRNA-9高表达的骨肉瘤细胞增殖速率降低、细胞凋亡率增加、CXCR4 mRNA转录水平下调,差异有统计学意义。结论：CXCR4基因参与miRNA-9抑制骨肉瘤MG-63细胞增殖过程,同时促进细胞凋亡。     

miR-762在胰腺癌中的表达及对胰腺癌细胞生物学行为的影响

背景与目的：miR-762在多种恶性肿瘤中存在表达异常,参与肿瘤的增殖、凋亡及侵袭转移。观察miR-762在胰腺癌组织和细胞系中的表达及对胰腺癌细胞增殖、侵袭转移的影响。方法：采用实时荧光定量聚合酶链反应（real-time fluorescence quantitative polymerase chain reaction,RTFQ-PCR）技术检测于河北医科大学第四医院行胰腺癌根治术的胰腺癌组织和细胞株中miR-762的表达。通过Lipofectamine ^TM 2000将miR-762模拟物（mimics）、miR-762抑制物（inhibitors）及其阴性对照序列（scramble序列）分别转染胰腺癌PANC-1细胞。采用细胞计数试剂盒（cell counting kit-8,CCK-8）实验检测细胞增殖;采用流式细胞术检测细胞凋亡;采用划痕实验和Transwell侵袭实验检测细胞侵袭转移能力;采用蛋白质印迹法（Western blot）检测上皮-间质转化（epithelial-mesenchymal transformation,EMT）相关分子标志物表达。结果：胰腺癌组织中miR-762 mRNA表达量显著高于癌旁组织（P<0.01）。胰腺癌细胞株BxPC-3、PANC-1、AsPC-1、SW-1990中miR-762 mRNA的表达量也显著高于正常胰腺上皮细胞HPDE（P<0.01）。转染miR-762 mimics后PANC-1细胞miR-762 mRNA表达量显著增加,而转染miR-762 inhibitors后PANC-1细胞miR-762 mRNA表达量显著降低（P<0.01）。同时miR-762 mimics组450 nm处的吸光度（D ₄₅₀ ）值、细胞迁移距离和穿膜细胞数及间质表型细胞标志物N-钙黏蛋白（N-cadherin）、波形蛋白（vimentin）表达量显著增加,细胞凋亡率及上皮细胞标志物E-钙黏蛋白（E-cadherin）表达量显著降低;而miR-762inhibitors组D ₄₅₀ 、细胞迁移距离和穿膜细胞数及间质表型细胞标志物N-cadherin、vimentin表达量显著降低,细胞凋亡率及上皮细胞标志物E-cadherin表达量显著增加（P<0.05）。结论：miR-762在胰腺癌组织和细胞株中高表达,上调miR-762表达可能通过调控N-cadherin、vimentin、E-cadherin表达促进EMT进程,从而增强PANC-1细胞的增殖和侵袭转移能力。     

转移抑制基因BRMS1mRNA在骨肉瘤细胞株中的表达及临床意义的研究

目的研究转移抑制基因BRMS1在人骨肉瘤细胞株中的体外转录水平,探讨其在侵袭转移过程中的作用。方法应用半定量RT-PCR技术检测BRMS1mRNA在3种人骨肉瘤细胞株(SaOS-2、HOS和MG-63)中的表达。结果半定量RT-PCR检测BRMS1mRNA在3株骨肉瘤细胞株中表达水平下降,在正常成骨细胞中则以较高水平表达。结论人骨肉瘤细胞株SaOS-2、HOS和MG-63细胞随侵袭转移能力的增强,BRMS1mRNA表达水平下降,为研究骨肉瘤的转移机制提供了理论基础。     

雷帕霉素抑制人骨肉瘤MG-63细胞周期的实验研究

目的观察雷帕霉素对人骨肉瘤细胞株MG-63增殖、周期及Cyclin D1基因表达的影响,探讨雷帕霉素抑制骨肉瘤细胞周期的可能机制。方法体外培养骨肉瘤MG-63细胞,用不同浓度的雷帕霉素（1、10、25nmol／L）干预MG-63细胞。采用水溶性四唑盐WST-8比色法检测MC-63细胞增殖的变化;流式细胞仪检测MG-63细胞周期;RT—PCR及免疫细胞化学SABC法检测MG-63细胞Cyclin D1基因表达的变化。结果雷帕霉素能显著抑制MG-63细胞增殖,呈时间依赖性,差别有显著性意义（P〈0．05）;流式细胞分析显示雷帕霉素能显著抑制细胞周期,使GO／G1期细胞增多（P〈0．05）;RT—PCR检测显示雷帕霉素对MG-63细胞Cyclin D1 mRNA表达无明显影响（P〉0．05）;免疫细胞化学分析雷帕霉素能显著抑制Cyclin D1蛋白的表达,差别有显著性意义（P〈0．05）。结论雷帕霉素能下调MG-63细胞Cyclin D1蛋白的表达,抑制MG-63细胞增殖及细胞周期。     

大蒜素对骨肉瘤MG-63细胞系增殖和凋亡的影响

目的观察大蒜素对人成骨肉瘤细胞株MG-63增殖和凋亡的影响。方法不同浓度的大蒜素作用于体外培养的MG-63细胞,倒置显微镜下观察MG-63细胞的形态学变化,采用CCK-8法检测大蒜素对MG-63细胞增殖抑制能力,吖啶橙/溴化乙锭双荧光染色及Annexin V-FITC标记流式细胞术检测细胞凋亡情况以及对MG-63细胞周期影响。结果大蒜素可抑制人成骨肉瘤细胞株MG-63细胞增殖,具有明显剂量和时间依赖性,10 μg/ml大蒜素可明显诱导MG-63细胞凋亡,并将细胞周期阻滞在G2/M期。结论大蒜素能够诱导MG-63细胞凋亡,阻滞细胞周期,抑制细胞增殖。     

miR-361-5p对肾细胞癌ACHN细胞恶性生物学行为的影响

目的：探讨miR-361-5p对肾细胞癌ACHN细胞增殖、侵袭、迁移、凋亡及其细胞周期的影响。方法：将miR-361-5p mimics和miR-361-5p inhibitor分别转染至肾癌ACHN细胞中,用qPCR检测转染细胞中miR-361-5p的表达水平,用MTT法、划痕愈合实验、Transwell实验、流式细胞术分别检测细胞的增殖、迁移、侵袭、细胞周期和凋亡水平。结果：与空白对照组和 Mimics-NC组比较,miR-361-5p mimics组ACHN细胞中miR-361-5p表达水平显著升高（P<0.01）,细胞的增殖、侵袭和迁移能力均显著减弱（均P<0.01）,而凋亡率升高（P<0.01）。与空白对照组或Inhibitor-NC组比较,miR-361-5p inhibitor组细胞中miR-361-5p表达水平显著下降（P<0.01）,细胞的增殖、侵袭和迁移能力均增强（均P<0.01）,细胞周期运转加速（P<0.01）,凋亡率降低（P<0.05）。结论：miR-361-5p可抑制肾癌ACHN细胞的增殖、侵袭和迁移,并诱导细胞凋亡,其在肾癌发生发展过程中发挥重要的抑制作用。     

miR-106a下调MAP3K2抑制骨肉瘤细胞增殖的实验研究

目的:探讨miR-106a对骨肉瘤细胞增殖的影响及机制。方法:利用Real-time PCR比较了正常成骨细胞（hFOB11.9）及三种骨肉瘤细胞（MG-63、U-2OS和HOS）中miR-106a的表达情况;将NC（negative control)、miR-106a mimics及miR-106a inhibitor分别转染MG-63细胞;转染后通过CCK-8实验、平板克隆形成实验检测miR-106a对细胞增殖的影响;通过生物信息学软件预测miR-106a的靶基因-蛋白激酶2（MAP3K2）;分别构建MAP3K2 3'-UTR结合区野生型和突变型载体,通过荧光素酶报告基因实验检测miR-106a对MAP3K2的调控;在转染了NC以及miR-106a mimics的MG-63细胞中,利用Western blot检测MAP3K2的蛋白水平。结果:与正常成骨细胞相比,骨肉瘤细胞MG-63、U-2OS和HOS中miR-106a的表达明显降低（P＜0.05）;CCK-8生长曲线表明,转染48、72和96小时后,与NC相比,miR-106a mimics能够显著抑制MG-63细胞的生长（P＜0.05）,而miR-106a inhibitor则能促进肿瘤细胞的生长（P＜0.05）;平板克隆形成实验也表明miR-106a mimics能够抑制MG-63的生长,miR-106a inhibitor发挥相反作用;荧光素酶报告基因实验表明转染了克隆MAP3K2 3'-UTR的荧光素酶质粒组中,荧光素酶活性受到miR-106a mimics的明显抑制（P＜0.05）,而在MAP3K2 3'-UTR突变组中,荧光素酶活性与对照相比无显著差异（P=0.877）;与NC组相比,转染miR-106a mimics后,MAP3K2的表达明显降低（P＜0.05）。结论:miR-106a可能通过下调MAP3K2的表达抑制骨肉瘤细胞的生长。     

miRNA-184在胶质瘤组织中的表达及其对胶质瘤细胞增殖和凋亡的影响

目的:探讨miRNA-184在胶质瘤组织中的表达及其对胶质瘤细胞增殖和凋亡的影响以及胶质瘤发生发展过程中的分子机制。方法:利用荧光定量PCR（RT-qPCR）检测miRNA-184在患者胶质瘤组织以及癌旁组织中的表达水平；利用体外细胞培养实验向胶质瘤细胞中转染miRNA-184 mimics；利用CCK-8比色法和流式细胞仪分别检测转染miRNA-184 mimics后胶质瘤细胞的增殖能力和凋亡情况；利用Western blot检测转染miRNA-184 mimics后胶质瘤细胞中AKT蛋白的表达水平。结果:荧光定量PCR检测结果表明，miRNA-184在患者胶质瘤组织中的表达水平显著低于癌旁组织（P＜0.05）；细胞体外转染实验结果表明，转染miRNA-184 mimics后，胶质瘤细胞的增殖能力显著下降，凋亡率显著升高（P＜0.01）；Western blot检测结果表明，转染miRNA-184 mimics后胶质瘤细胞中AKT蛋白表达水平显著下降（P＜0.05）。结论:miRNA-184在胶质瘤组织中显著低表达，miRNA-184与胶质瘤的发生发展密切相关；过表达miRNA-184可以抑制胶质瘤细胞的增殖，促进胶质瘤细胞的凋亡；miRNA-184可能通过抑制AKT信号通路从而抑制胶质瘤的发生发展。     

Effects of Kruppel-like factor 6 on osteosarcoma cell biological behavior

Kruppel-like factor 6 (KLF6) is a tumor suppressor gene frequently downregulated in a number of human cancers, including osteosarcoma. However, the role of KLF6 in osteosarcoma remains unclear. This study was aimed at investigating the effects of KLF6 on osteosarcoma cell biological behavior. First, the expression of KLF6 in osteosarcoma cell lines (MG63, SaOS-2, U2OS, and HOS) and a human osteoblastic cell line (hFOB1.19) was detected by Western blotting. Results showed that KLF6 displayed a significant downregulation in osteosarcoma cell lines (MG63, SaOS-2, U2OS, and HOS) compared with human osteoblastic cell line (hFOB1.19). To investigate the role of KLF6 in osteosarcoma cell proliferation, apoptosis, and invasion, we generated human osteosarcoma MG63 cells in which KLF6 was either overexpressed or depleted. The MG63 cell viability, cycle, apoptosis, and invasive ability were analyzed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide staining, propidium iodide (PI) staining, Annexin-V-FITC/PI double staining, and Transwell invasion experiment, respectively. Results showed that the viability, proliferation, and invasive abilities were suppressed, and the apoptosis was enhanced in MG63 cells with overexpression of KLF6. The viability, proliferation, and invasive abilities were improved, and the apoptosis was inhibited in MG63 cells with knockdown of KLF6. At the same time, these molecules, including p21, bcl-2, and MMP-9, associated with the events about cell cycle, apoptosis, and invasion, were detected. Results showed that the expressions of bcl-2 and MMP-9 were downregulated, and the expressions of p21 were upregulated in the MG-63 cells with overexpression of KLF6. Taken together, our results suggested that KLF6 could inhibit proliferation and invasion, and facilitate apoptosis of osteosarcoma cells, which might be a potential target for the treatment of osteosarcoma.     

MicroRNA 181a improves proliferation and invasion, suppresses apoptosis of osteosarcoma cell

MicroRNA 181a (miR-181a) was found dysregulated in a variety of human cancers and significantly associated with clinical outcome of cancer patients. However, the direct role of miR-181a has not yet been characterized in osteosarcoma progression. This study was aimed at investigating the effects of miR-181a on osteosarcoma cell biological behavior. First, the expression of miR-181a in osteosarcoma cell lines (MG63, HOS, SaOS-2, and U2OS) and a human osteoblastic cell line (hFOB1.19) was detected by qRT-PCR. Results showed that miR-181a was overexpressed in osteosarcoma cell lines compared to human osteoblastic cell line (hFOB1.19). To investigate the effects of miR-181a on proliferation, apoptosis, and invasion of osteosarcoma cells, we generated human osteosarcoma MG63 cells in which miR-181a was either overexpressed or depleted. The MG63 cell viability, cycle, apoptosis, and invasive ability were analyzed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide staining, propidium iodide (PI) staining, Annexin V-FITC/PI double staining, and Transwell invasion experiment, respectively. The results showed that MG63 cell viability, proliferation, and invasive abilities were suppressed, and the apoptosis was enhanced in the group with underexpression of miR-181a. The viability, proliferation, and invasive abilities were improved, and the apoptosis was inhibited in the group with overexpression of miR-181a. The results from Western blotting indicated that miR-181a might be associated with the up-regulation of bcl-2 and matrix metalloproteinase 9 and the down-regulation of tissue inhibitor of metalloproteinases-3 and p21 in MG63 cells. Taken together, our results suggested that miR-181a might facilitate proliferation and invasion and suppress apoptosis of osteosarcoma cells, which might be a potential target for the treatment of osteosarcoma.     

LncRNA DARS-AS1靶向miR-758-3p促进骨肉瘤细胞增殖并抑制凋亡

目的:探讨LncRNA DARS-AS1对骨肉瘤细胞增殖及凋亡的影响及其可能作用机制。方法:qRT-PCR法检测骨肉瘤组织、瘤旁组织、人成骨细胞hFOB 1.19、人骨肉瘤细胞Saos2、U2OS、HOS中LncRNA DARS-AS1、miR-758-3p的表达量;对Saos2细胞进行转染,根据不同转染物分为si-NC组、si-LncRNA DARS-AS1组、miR-NC组、miR-758-3p组、si-LncRNA DARS-AS1+anti-miR-NC组、si-LncRNA DARS-AS1+anti-miR-758-3p组;MTT法、流式细胞术分别检测细胞增殖及凋亡;双荧光素酶报告实验检测LncRNA DARS-AS1与miR-758-3p的靶向调控关系。结果:与瘤旁组织比较,骨肉瘤组织中LncRNA DARS-AS1的表达量升高(P<0.05),miR-758-3p的表达量降低(P<0.05);与hFOB 1.19细胞比较,Saos2、U2OS、HOS细胞中LncRNA DARS-AS1的表达量升高(P<0.05),miR-758-3p的表达量降低(P&...     

Kv1.3钾通道在骨肉瘤中的表达及作用研究

目的 探讨特异性短发卡RNA（shRNA）抑制Kv1.3钾通道对骨肉瘤MG-63细胞增殖和凋亡的影响。方法 采用实时荧光定量聚合酶链反应、Western blotting和免疫组化检测骨肉瘤MG-63细胞中Kv1.3钾通道的表达,并分别采用CCK-8法、裸鼠骨肉瘤异种移植模型和流式细胞仪检测MG-63细胞增殖、生长和凋亡的变化,采用Western blotting检测MG-63细胞中多聚ADP核糖聚合酶（PARP）和caspase-3的表达水平。结果Kv1.3钾通道在骨肉瘤细胞中异常高表达。沉默Kv1.3钾通道的Ad5-Kv1.3-shRNA能从体内外有效地抑制MG-63细胞增殖并促进其早期凋亡。沉默Kv1.3钾通道可明显诱导细胞凋亡相关蛋白caspase-3和PARP的裂解。结论Kv1.3钾通道参与骨肉瘤细胞增殖和凋亡的过程,有望成为骨肉瘤治疗及诊断的新靶点基因。     

微小RNA-101对人骨肉瘤细胞自噬和侵袭性的影响

目的 探讨微小RNA-101（microRNA-101,miR-101）的表达对人骨肉瘤细胞自噬和侵袭性的影响。方法 采用实时荧光定量PCR（qRT-PCR）检测骨肉瘤组织和人骨肉瘤细胞系MG-63细胞以及成骨细胞miR-101的相对表达,蛋白免疫印迹(Western blot)检测两种细胞自噬相关蛋白Beclin1和LC3B的表达;经脂质体转染将miR-101模拟物和miR-101阴性对照转染MG-63细胞,并设立空白对照,通过qRT-PCR、Western blot和侵袭实验（Transwell）检测以上三组细胞miR-101的表达、Beclin1和LC3B的表达以及三组细胞侵袭能力的变化。结果 与癌旁骨组织和正常骨组织或成骨细胞相比,miR-101在骨肉瘤组织和MG-63细胞中表达明显下降（P<0.01）;模拟物转染组miR-101的表达较空白对照组上调了255%,但该组自噬相关蛋白的表达较空白组却显著降低（P<0.01）;Transwell侵袭实验显示,模拟物转染组细胞迁移数目较阴性对照组和空白对照组分别减少了60%和67.67%（P<0.01）。结论 miR-101在骨肉瘤组织和骨肉瘤细胞中呈现低表达,可能与骨肉瘤的发生发展相关。miR-101抑制骨肉瘤细胞侵袭,其机制可能是通过抑制细胞自噬而发挥作用。     

MACC1 is involved in the regulation of proliferation,colony formation,invasion ability,cell cycle distribution,apoptosis and tumorigenicity by altering Akt signaling pathway in human osteosarcoma

There is mounting evidence that metastasis-associated in colon cancer-1 (MACC1) plays pivotal roles in development and progression of many tumors, particularly in osteosarcoma (OS). However, its precise roles and molecular mechanisms remain to be delineated in OS. In the current study, we found that the levels of MACC1 mRNA and protein in four OS cell lines (MG-63, HOS, SaOS-2 and U2OS) were significantly higher than that in hFOB1.19 osteoblast (P?<?0.05). The vector pcDNA-MACC1 contributed to the increase of MACC1 level in MG-63 cells, whereas MACC1 siRNA evoked the decrease of MACC1 level in U2OS cells. In addition, MACC1 downregualtion caused the inhibition of cell proliferation in vitro, colony formation, invasion and tumor growth in vivo, arrested cell cycle in G0/G1 phase and induced cell apoptosis in U2OS cells, and reversed effects were observed in MG-63 cells by MACC1 upregulation. Most notably, MACC1 depletion markedly inactivated Akt signaling pathway in U2OS cells, conversely, MACC1 upregulation evidently activated Akt signaling pathway in MG-63 cells. Collectively, our data presented herein suggest that biological implications triggered by MACC1 may be tightly associated with the status of Akt signaling pathway in OS.     

Roles of microRNA-206 in Osteosarcoma Pathogenesis and Progression

Backgroud and Aims: MicroRNA-206 has proven to be down-regulated in many human malignancies incorrelation with tumour progression. Our study aimed to characterize miR-206 contributions to initiationand malignant progression of human osteosarcoma. Methods: MiR-206 expression was detected in humanosteosarcoma cell 1ine MG63, human normal osteoblastic cell line hFOB 1.19, and paired osteosarcoma andnormal adjacent tissues from 65 patients using quantitative RT-PCR. Relationships of miR-206 levels toclinicopathological characteristics were also investigated. Moreover, miR-206 mimics and negative control siRNAwere transfected into MG63 cells to observe effects on cell viability, apoptosis, invasion and migration. Results:We found that miR-206 was down-regulated in the osteosarcoma cell line MG63 and primary tumor samples,and decreased miR-206 expression was significantly associated with advanced clinical stage, T classification,metastasis and poor histological differentiation. Additionally, transfection of miR-206 mimics could reduce MG-63 cell viability, promote cell apoptosis, and inhibit cell invasion and migration. Conclusions: These findingsindicate that miR-206 may have a key role in osteosarcoma pathogenesis and development. It could serve as auseful biomarker for prediction of osteosarcoma progression, and provide a potential target for gene therapy.     

洛铂对骨肉瘤MG-63细胞增殖、凋亡的影响及其机制

目的 探讨洛铂对骨肉瘤MG-63细胞增殖与凋亡的作用及其机制。方法 取对数生长期的MG-63细胞进行实验,分为对照组和实验组 (加入不同浓度洛铂: 2、4和8 μg/ml)。采用噻唑盐（MTT）比色法、流式细胞技术(FCM)检测洛铂对MG-63细胞的形态改变、生长及增殖抑制、细胞周期阻滞和细胞凋亡诱导等作用,并绘制不同浓度时MG-63细胞的生长曲线,应用Western blot的方法分析洛铂对MG-63细胞的Bcl-2蛋白表达的影响。结果 洛铂能够抑制MG-63细胞的生长、增殖并诱导其凋亡,并呈浓度和时间依赖效应。Western blot检测结果显示洛铂可使MG-63细胞Bcl-2蛋白表达下降。结论 洛铂能显著抑制MG-63细胞增殖,诱导细胞凋亡和细胞周期变化,可能与调节 MG-63细胞Bcl-2蛋白的表达有关。