不同转移潜能MG63骨肉瘤细胞亚株裸鼠肺转移模型的建立

Objective: To establish a nude mice model of human osteosarcoma lung metastasis. Methods: The growth of human osteosarcoma cell sublines M8 and M6 was determined by MTT assay. 2 × 107 cells were injected into the tail vein of nude mice. Mice were sacrificed started on week 4 after injection, and lung metastases were evaluated under both mac-roscopic and microscopic observation with HE staining. Results: The growth of low-metastatic subline M6 was lower than high-metastatic sublines M8. Seventeen mice after injected M8 had occurred lung metastases while only one mice had oc-curred in M6 group. Moreover, M8 cells within metastases were arrangement disorder with variable nuclear hyperchromasia. Conclusion: A mouse model for human osteosarcoma cancer lung metastasis can be established by injection different ability of metastasis MG63 cells into tail vein.     

肺癌抑制基因-1对人骨肉瘤MG63细胞生长的抑制效应(英文)

Objective: The aim of this study was to establish the osteosarcoma cell sublines which stably expressing tumor suppressor in lung cancer-1 (TSLC1) gene and evaluate its effect on growth inhibition of human osteosarcoma cell line MG63. Methods: The recombinant plasmid pCI-TSLC1 was stably transfected into MG63 cells with Lipofectamine 2000. The positive clones were developed by selection by G418. Biological characteristics of one of the 6 cell lines which highly expressing TSLC1, namely, the M8T were studied. Cell growth was analyzed with MTT assay. 2 × 107 cells suspended in 0.2 mL phosphate buffered saline (PBS) were injected into the two flanks of 5-6-week-old female BALB/C nu/nu athymic nude mice. The volumes of subcutaneous of tumor growth were evaluated and calculated by the formula V= Length × Width × Height × 0.5 once a week. Results: The M8T cell subline which stably expressing TSLC1 was characterized by Western blot. The genetic stability and purity of M8T cells were stable. TSLC1 significantly suppressed the growth of M8T cells in vitro. Moreover, the tumorigenicity of M8T cells was suppressed in vivo. Conclusion: The osteosarcoma cell sublines M8T which stably expressing TSLC1 had been successfully established. The ability of growth and metastasis of M8T was significantly suppressed both in vitro and in vivo.     

INFLUENCE OF IMMUNE STATUS OF THE IMMUNE DEFICIENT MICE ON THE METASTATIC PHENOTYPES OF THE HETEROGENEOUS CLONAL SUBLINES OF HUMAN LUNG GIANT CELL CARCINOMA

By using cell cloning technique, 4 sublines (A,C,D,E) were isolated from a cell line of human lung giant cell carcinoma (PLA-801). After subcutaneous inoculation in T-cell deficient BALB/c nude mice, the incidence of tumor growth and spontaneous metastasis were the highest in subline D, moderate in sublines A and E, and lowest in subline C. Tumor cells of subline C also showed similar low tumorigenicity in another T-cell deficient 615/ PB1 nude mice.However, in 615/PB1 beige nude mice with con-genitally combined immune-deficiency in both T and NK cell activity, tumor cells of the rarely metastatic subline C do produce significantly high frequency of tumor growth and spontaneous metastasis.Morphological studies (light microscope, electron microscope and immunohistochemistry) showed rich microfilaments and Vimentin positive in the cytoplasm of metastatic tumor cells. This may imply a possibility that tumor cells differentiate towards the direction favourable to spreading and metastasis.     

Human endogenous retroviral syncytin exerts inhibitory effect on invasive phenotype of B16F10 melanoma cells

Objective; Fusogenic endogenous retroviral syncytin plays an important role in the formation of syncytiotrophoblasts in human placenta.Apart from its expression in placenta,brain and testis,syncytin has also been found in many cancers.Although syncytin has been proposed to serve as a positive prognostic marker in some cancers,the underlying mechanism is unclear.The aim of this study is to evaluate the effects of syncytin expression on the invasive phenotype of melanoma cells.Methods：The eukaryotic expression plasmid for syncytin-EGFP was constructed and transfected into B16F10 melanoma cells.The effect of syncytin on the invasion potential of rumor cells was evaluated in B16F10 subline cells that stably expressed syncytin-EGFP fusion protein or EGFP alone.Results：The B16F10 sublines that stably expressed syncytin-EGFP or EGFP alone were established respectively and confirmed by immunofluorescent and immtmoblotting assay.Syncytin expression in B16F10 cells was associated with decreased cell proliferation,migration and invasion.Multinucleated giant cells that contained as many as five nuclei were induced in syncytin-expressing cells.In addition,syncytin expression did not alter the sensitivity of B16F10 cells to trichosanthin,a toxin that damages syncytiotrophoblasts more efficiently than other tissues.Conclusions：These results suggest that syncytin expression in some cancers may confine their invasion potential and thus serve as a positive prognostic factor.     

甲基转移酶在恶性骨肉瘤体外诱导分化过程中的作用

Objective： To observe the change of DNA methyltransferase （Dnmt） in osteosarcoma cell lines differentiation induction in vitro, so as to explore the function and relativity of Dnmt in malignant osteosarcoma cell during differentiation induction in vitro. Methods： After in vitro differentiation induction by all trans-retinoic acid （ATRA）, morphological and functional changes of the cells were observed. The expression levels of Dnmt and PCNA mRNA were detected by semi-quantitative RT-PCR. Changes of cell cycle were determined by flow cytometry （FCM）. Results： After treatment with ATRA, the growth of MG-63 cell was inhibited. The cells underwent morphological and functional differentiation. Alkaline phosphatase activity of the cells was increased. The relative expression levels of Dnmt and PCNA mRNA were decreased remarkably in osteosarcoma cells with the time delayed. Osteosarcoma cells were arrested in G1 phase. Conclusion： ATRA could inhibit cell growth and induce differentiation of MG-63 ceils in morphologic and function. The Dnmt regulation directly links to cell cycle and PCNA mRNA levels. Inhibition of the Dnmt mRNA expression in MG-63 ceils may be one of the important mechanisms of ATRA inducing differentiation of osteosarcoma cells.     

Experiment studies of antitumor proliferation and metastasis of a new chinese herb AT-1

Objective: To study the effects of a new Chinese herb AT-1 on the tumor cell proliferation and metastasis in vitro.Methods: Tumor cell proliferation activity was tested by MTT. The ability of tumor cell invasion and migration was assayed by counting the number of tumor cells going throw matrigel. The expression changes of CD44 genes in PG cells treated with AT-1 were tested by FACS. Results:Compared with the control, the proliferation activity of the cells treated with the At-1 was restrained. The invasion and migration ability of PG cells and the expression of the cell adherence related gene CD44 was decreased treatment with AT-1. Conclusion: AT-1 is a new antitumor proliferation and metastasis agent. Its antitumor metastasis effect might be achieved by decreasing the expression of the cell adherence-associate gene CD44.     

High Expression of the RECK Gene in Breast Cancer Cells is Related to Low Invasive Capacity

OBJECTIVE To investigate the expression of the RECK gene in human breast (cancer) cell lines, and to determine the relationship between RECK gene expression and the invasive capacity of the breast cancer cell lines. METHODS The invasive capacity of breast (cancer) cell lines including HBL-100, MCF-7 and MDA-MB-435S were determined by the Tran-swell method. The protein expression levels of RECK, MMP-2 and MMP-9 genes in these three cell lines were measured by immunocytochemical methods. The expressions of the RECK gene and protein level were measured by RT-PCR and Western blots in the cell lines respectively. RESULTS The order of the invasive capacity of the breast (cancer) cell lines was MDA-MB-435S, being the highest, and HBL-100, being the lowest. The invasive capacity difference between any two groups among the three groups was significant (P<0.01). The protein expression level of the RECK gene in the HBL-100 cell line was highest, and no expression was detected in MDA-MB-435S cells. Moreover, the expression of the RECK gene was negatively correlated with the expression of the MMP-2 and MMP-9 genes. The mRNA level of the RECK gene in HBL-100 cells was the highest, but no expression was found in the MDA-MB-435S cells (P<0.001). CONCLUSION There was a significant negative correlation between the expression level of the RECK gene and invasive capacity in vitro, and the RECK gene expression showed an inverse proportion to that of the MMP-2, MMP-9 genes.     

Clinical significance of XRCC1 gene expression in human breast cancer and its cell and molecular mechanisms北大核心CSCD

Objective: To investigate the expression of X-ray repair cross complementing 1 (XRCC1) in human breast cancer and its relationship with the clinical characteristics, and to analyze the effects of XRCC1 over-expression on the proliferation and migration of breast cancer MB-231 cells and the molecular mechanism. Methods: The expression level of XRCC1 mRNA in breast cancer cell lines and human breast cancer tissues was detected by real-time fluorescent quantitative PCR. The expression of XRCC1 protein in human breast cancer tissues was detected by immunohistochemistry. The relationship between the expression of XRCC1 protein and the clinicopathological characteristics of breast cancer patients was analyzed. The pcDNA3.1(+)-Flag-XRCC1 plasmids were transfected into breast cancer MB-231 cells for the overexpression of XRCC 1 gene. Then the proliferation activity was detected by CCK-8 and soft agar plate clone formation assay. The cell cycle and apoptosis were detected by FCM method. The cell migration and invasion were detected by Transwell chamber assay. The expressions of cell cycle-, apoptosis- and migration-related proteins were detected by Western blotting. Results: The expression level of XRCC1 mRNA was significantly decreased in most breast cancer cell lines (all P < 0.001). As compared with the normal mammary epithelium and the paired adjacent breast tissues, the expression levels of XRCC1 mRNA and protein were downregulated in human breast cancer tissues (all P < 0.001). The expression level of XRCC1 mRNA was positively correlated with the prognosis of breast cancer patients (γ 2 =0.052, P =0.046), and XRCC1 protein expression was correlated with tumor diameter, lymph node metastasis, histological grade and TNM stage (all P < 0.05). After the overexpression of XRCC 1 gene, the proliferation, colony formation, invasion and migration of breast cancer MB-231 cells were significantly inhibited (all P < 0.01), the cell cycle was significantly blocked in G1 phase (P < 0.001), and the apoptosis rate was significantly increased (P < 0.001). Furthermore, the expressions of p21, p27, Bax, cleaved caspase-3 and E-cadherin were significantly upregulated (all P < 0.001), while the expressions of cyclin-dependent kinase 4/6 (CDK4/6), cyclin D1, Bcl-2, N-cadherin and vimentin were down-regulated (all P < 0.001) in MB-231 cells with XRCC1 overexpression. Conclusion: XRCC1 expression is down-regulated in breast cancer cell lines and tissues, and its expression level is positively correlated with the prognosis of breast cancer patients. Restoring XRCC 1 gene expression can inhibit cell growth, migration and invasion, and can induce apoptosis. So XRCC1 may be a potential tumor suppressor regulating the occurrence and development of human breast cancer. © 2019 by TUMOR.     

MTA1基因表达与人骨肉瘤细胞浸润和转移的关系

背景与目的:骨肉瘤具有很高的转移特性,以肺转移多见。尽管能成功控制原发瘤,但5年内仍然有超过30%的患者死于肺转移。肿瘤转移相关基因(MTA1)是新近发现的一个肿瘤转移候选基因,其表达增高与乳腺癌及胃癌、结直肠癌的侵袭转移能力成正相关。MTA1在骨肉瘤中的表达国内外尚未见相关研究报道,通过比较MTA1基因在人骨肉瘤细胞高低转移株的表达水平,探讨MTA1表达与骨肉瘤细胞浸润和转移潜能的相关性。方法:采用半定量逆转录聚合酶链反应(RT-PCR)检测MG-63骨肉瘤细胞高低转移株MTA1的表达情况,用Boyden小室体外侵袭实验检测两株MG-63细胞的体外侵袭力;用脂质体介导的MTA1基因转染MG-63低转移株细胞,通过RT-PCR检测MTA1的表达;Boyden小室体外侵袭实验检测转染前后细胞侵袭力的变化。结果:RT-PCR结果显示MTA1在MG-63低转移细胞株中表达水平低(1.32),在高转移细胞株中表达水平高(6.27)(P<0.05);Boyden小室体外侵袭实验显示MG-63高转移株细胞体外侵袭力强,其穿膜细胞相对百分率为(46.3±2.4)%,低转移株细胞体外侵袭力较弱,其穿膜细胞相对百分率(12.6±1.1)%,两者差异有显著性(P<0.05);转染MTA1基因后,低转移细胞株转移潜能较未转染细胞明显增高。结论:MTA1与人骨肉瘤细胞转移潜能有密切关系,MTA1对肿瘤转移的作用机制以及作为干预肿瘤转移靶基因的可能性值得进一步探讨。     

骨唾液酸蛋白的表达对骨肉瘤细胞侵袭转移特性的影响

 目的 构建人骨唾液酸蛋白（BSP）正反义真核表达载体，研究其对骨肉瘤细胞侵袭转移特性的影响。方法 以PCR的方法扩增人BSP的开放阅读框序列，与载体pIRES2-EGFP相连构成重组正反义表达质粒。以脂质体介导转染入MG-63细胞，通过Western blot检测细胞中蛋白的表达。以重组基底膜侵袭实验和划痕实验测定对骨肉瘤细胞侵袭力的影响。结果 成功构建了人BSP正反义核酸真核表达载体，转染后有效表达hBSP，与对照组相比，正义载体转染后使MG-63细胞中hBSP蛋白表达水平升高，侵袭力增强；反义载体转染后使MG-63细胞中hBSP蛋白表达水平降低，侵袭力受到抑制。结论 BSP表达的改变可能在骨肉瘤的浸润转移过程中起重要作用，BSP表达下调可以抑制骨肉瘤的侵袭能力。     

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.     

骨肉瘤高低不同转移特性细胞亚系差异表达基因的分析和意义

背景与目的：骨肉瘤转移机制密切相关的基因筛选是骨科领域研究的难点。本研究应用基因芯片技术筛选高低不同转移特性骨肉瘤细胞亚系的差异表达基因，并探讨其转移的分子机制。方法：提取骨肉瘤细胞亚系A1和A2的总RNA，反转录制备杂交探针，运用基因芯片进行杂交，杂交信号用Agilent Seanner扫描，用Ima Gene3．0软件和Genespring软件分析和处理数据。结果：对A1和A2的基因表达谱分析。发现两者表达差异显著的基因有222个，其中在A1中119个基因表达上调，103个基因表达下调，这些基因可以划分为6个主要功能群，其中49个基因的差异表达非常显著。结论：A1和A2存在多方面基因的表达差异，只有部分差异与骨肉瘤的转移机制密切相关；基因芯片技术能有效地分析各细胞亚系的基因表达谱、为研究骨肉瘤转移机制提供新的途径。     

RECK基因在骨肉瘤细胞中的表达及其与MMP-2的关系

Objective:To detect the expression of RECK gene in the highly and low metastatic cell sublines of human os-teosarcema cell HOS and explore its possible roles on the occurrence and metastasis of osteosarcoma. Methods:RT-PCR, gelatin zymography, and rnatrigel invasion assay were respectively used to evaluate the endogenous expression of RECK mRNA, MMP-2 activation ratio and invesive capacity in the two osteosarcoma cell sublines. Results:The highly metastatic cell group expressed significantly lower mRNA level of RECK than the low metastatic cell group (P < 0.05), but showed higher MMP-2 activation ratio and invasive capacity (P < 0.05 and P < 0.01, respectively). Conclusion:The abnormal low expression of RECK may participate in osteosarcoma invasion and metastasis, and may be a new therapeutic target for osteosarooma.     

腺病毒介导VEGF-siRNA对荷人骨肉瘤裸鼠移植瘤生长的影响

目的:观察腺病毒介导的VEGF-siRNA对荷人骨肉瘤细胞株MG63裸鼠移植瘤生长的影响。方法:将Ad-VEGF-siRNA感染MG63,用噻唑蓝(thiazolyl blue,MTT)法检测细胞体外增殖活力,反转录-聚合酶链反应(reverse transeription-poly-merase chain reaction,RT-PCR)法检测VEGF抑制效果。建立裸鼠移植瘤模型,定期瘤内注射Ad-VEGF-siRNA,观察裸鼠致瘤率、肿瘤体积、抑瘤率及免疫组化法检测肿瘤组织中bcl-2的表达。结果:感染Ad-VEGF-siRNA能明显抑制MG63细胞的生长,瘤灶内注射Ad-VEGF-siRNA后裸鼠移植瘤的质量和体积均显著低于对照组(P<0.01)。TUNEL染色显示肿瘤细胞凋亡增加,免疫组化结果提示肿瘤组织中bcl-2表达明显减少(P<0.01)。结论:Ad-VEGF-siRNA可有效而特异地阻断VEGF基因表达,抑制裸鼠移植瘤生长,促进肿瘤细胞的凋亡。     

MTA家族蛋白表达与非小细胞肺癌侵袭转移的相关性探讨

目的:探讨肿瘤转移相关基因(matastasis associated gene,MTA)家族蛋白作为非小细胞肺癌（non-small cell lung cancer,NSCLC）预后预测因子的价值,为进一步了解该基因家族与肿瘤侵袭和转移相关的分子机制提供参考。方法:应用免疫组化(SABC)检测MTA家族（MTA1、MTA2、MTA3）蛋白在54例NSCLC肿瘤组织中的表达水平,分析与NSCLC临床病理特征的关系;选取正常肺上皮细胞BEAS-2B、肺癌高转移细胞株95-D与低转移细胞株95-C,对比MTA1在其中的表达与细胞侵袭转移的相关性。结果:MTA1、MTA2和MTA3在NSCLC组织中均有较高的表达,而MTA1表达水平与淋巴结转移状态相关;细胞学实验结果显示MTA1在肿瘤细胞中高表达,而MTA1在肺癌高转移细胞95-D中的表达水平显著高于低转移细胞95-C。结论:MTA1表达水平与肿瘤侵袭、转移关系密切,可考虑作为肿瘤转移、预后预测因子。     

MALAT1靶向调控miR-205与骨肉瘤侵袭的实验研究

目的   探讨人肺腺癌转移相关转录本1（MALAT1）与miR-205的关系,揭示MALAT1促进骨肉瘤发生发展的分子机制。方法   实时荧光定量PCR（QPCR）法检测骨肉瘤组织、癌旁正常组织、人成骨细胞（hFOB）以及骨肉瘤MG63、Sao-2细胞株中MALAT1和miR-205的表达;生物信息学及荧光素酶实验观察MALAT1对miR-205的靶向调控;miR-205 mimics转染Sao-2和MG63细胞后QPCR检测MALAT1表达, si-MALAT1转染Sao-2和MG63细胞后QPCR检测miR-205表达;miR-205 mimics和si-MALAT1分别转染MG63细胞,Transwell小室实验检测细胞侵袭能力,Western blotting检测MMP-2、MMP-9表达。结果   骨肉瘤组织、癌旁正常组织中MALAT1和miR-205表达量分别为4.7±0.6、2.6±0.08和2.2±0.09、3.7±0.3,差异有统计学意义（P＜0.05）;MG63、Sao-2细胞株中MALAT1和miR-205表达量分别为2.4±0.7、2.1±0.05和0.53±0.04、0.47±0.02,与hFOB中的0.9±0.01、0.82±0.04比较,差异有统计学意义（P＜0.05）;生物信息学及荧光素酶检测显示MALAT1序列中存在miR-205的3个互补序列,且两者存在靶向调控作用;转染si-MALAT1的Sao-2和MG63细胞中miR-205的表达量分别为3.4±0.7、3.8±0.6,对照组为1.4±0.5、1.0±0.1,差异有统计学意义（P＜0.05）;转染miR-205 mimics的Sao-2、MG63细胞中MALAT1的表达量分别为0.51±0.05、0.42±0.03,而对照组为1.5±0.7、1.28±0.4,差异有统计学意义（P＜0.05）;Transwell实验结果 显示miR-205 mimics组MG63细胞侵袭数为（28.52±3.68）个,低于miR-205 mimics与pMALAT1共转染组的（42.63±5.67）个,差异具有统计学意义（P＜0.05）;Western blotting结果 显示miR-205 mimics组MMP-2、MMP-9的表达量分别为0.41±0.02、0.49±0.04,显著低于miR-205与pMALAT1共转染组的0.73±0.01、0.80±0.05,差异具有统计学意义（P＜0.05）。结论   MALAT1与miR-205之间存在双向抑制关系,MALAT1通过抑制miR-205的表达促进骨肉瘤细胞的侵袭。