miR-542-5p对卵巢癌细胞SKOV3恶性生物学行为的影响

目的:探讨miR-542-5p对卵巢癌细胞系SKOV3的增殖、迁移、侵袭、凋亡等恶性生物学行为的影响。方法:应用miR-542-5p mimics和mimics阴性对照 (mimics NC)分别转染卵巢癌细胞SKOV3。采用MTT实验、划痕试验、Transwell实验和流式细胞术检测过表达miR-542-5p对SKOV3细胞增殖、迁移、侵袭、凋亡的影响。结果:过表达miR-542-5p后,SKOV3细胞的增殖能力较阴性对照和正常SKOV3细胞明显降低（P<0.05）;Transwell实验和划痕实验显示,过表达miR-542-5p后,细胞的迁移和侵袭能力较阴性对照组明显下降（P<0.05）;流式细胞术结果显示,过表达miR-542-5p后,SKOV3细胞的凋亡率较阴性对照组升高,而对细胞周期无影响。结论:过表达miR-542-5p可以抑制卵巢癌细胞SKOV3的体外增殖、迁移和侵袭能力,诱导细胞凋亡。提示miR-542-5p在卵巢癌恶性生物学进程中可能发挥重要作用。     

miR-182-5p通过靶向调节KLF7抑制骨肉瘤细胞的增殖、迁移和侵袭

目的:研究miR-182-5p对人骨肉瘤细胞增殖、迁移和侵袭的作用。方法:用qRT-PCR检测法比较人骨肉瘤细胞系（U2OS、MG63、SAOS2）、人正常细胞和人成骨细胞（HFOB1.19）中miR-182-5p的表达水平。转染miRNA模拟物或抑制剂或模拟物+KLF7,以转染miR-182-5p表达的上调或下调。通过EDU、迁移分析和侵袭分析来检测细胞功能。双荧光素酶报告分析检测miR-182-5p与KLF7的关系,蛋白质印迹分析检测KLF7的表达。结果:miR-182-5p在骨肉瘤细胞系中被下调。miR-182-5p过表达抑制肿瘤生长、迁移和侵袭。随后的研究显示,KLF7是骨肉瘤细胞中miR-182-5p的直接和功能靶点。miR-182-5p通过调节KLF7来抑制骨肉瘤细胞的增殖、迁移和侵袭。结论:miR-182-5p通过靶向调节KLF7而起到抑制骨肉瘤细胞增殖、迁移和侵袭的作用。     

Upregulated in Hepatitis B virus-associated hepatocellular carcinoma cells,miR-331-3p promotes proliferation of hepatocellular carcinoma cells by targeting ING5

Hepatitis B virus (HBV) is a major risk factor for development and progression of hepatocellular carcinoma (HCC). It has been reported that viral infection can interfere with cellular microRNA (miRNA) expression and participate in the pathogenesis of oncogenicity. Our miRNAs array data indicated that miR-331-3p expression in HCC cell lines increased, but the relationship between miR-331-3p expression and HBV activity is unclear. Here, we observed elevated expression of miR-331-3p in different HCC cell lines expressing HBV. HBV, especially HBx, promotes miR-331-3p expression by enhancing its promoter activity. Using a miRNA target prediction database miRBase, we identified ING5 to be a novel target gene of miR-331-3p. miR-331-3p could inhibit ING5 expression by directly targeting its 3′-untranslated region (3′-UTR). As predicted, HBV was confirmed to repress ING5 at both mRNA and protein levels by promoting miR-331-3p expression. Our result indicated that miR-331-3p expression promotes proliferation of SMMC7721 cells by inhibiting ING5. ING5 overexpression promoted cell apoptosis in HCC cell lines. We also found ING5 expression was decreased in tumor tissue of HCC patient with HBV infection compared to its expression in para-carcinoma tissues. Conclusion: These results showed that miR-331-3p is upregulated by HBV and promotes proliferation of HCC cells though repression of ING5 expression. These data provide new insights for understanding the mechanisms of HBV-related HCC pathogenesis.     

MiR-129-5p靶向HMGB1抑制骨肉瘤细胞增殖和迁移

目的 探讨miR-129-5p对骨肉瘤(OS)细胞增殖和迁移的影响以及对HMGB1的调控作用.方法 RT-PCR和Western blot法分别检测骨肉瘤细胞株MG-63、Saos-2和成骨细胞hFOB1.19中miR-129-5p和HMGB1的表达.生物信息学预测miR-129-5p与HMGB1基因是否存在结合位点,...     

Functional characterisation of osteosarcoma cell lines and identification of mRNAs and miRNAs associated with aggressive cancer phenotypes

Background:

Osteosarcoma is the most common primary malignant bone tumour, predominantly affecting children and adolescents. Cancer cell line models are required to understand the underlying mechanisms of tumour progression and for preclinical investigations.

Methods:

To identify cell lines that are well suited for studies of critical cancer-related phenotypes, such as tumour initiation, growth and metastasis, we have evaluated 22 osteosarcoma cell lines for in vivo tumorigenicity, in vitro colony-forming ability, invasive/migratory potential and proliferation capacity. Importantly, we have also identified mRNA and microRNA (miRNA) gene expression patterns associated with these phenotypes by expression profiling.

Results:

The cell lines exhibited a wide range of cancer-related phenotypes, from rather indolent to very aggressive. Several mRNAs were differentially expressed in highly aggressive osteosarcoma cell lines compared with non-aggressive cell lines, including RUNX2, several S100 genes, collagen genes and genes encoding proteins involved in growth factor binding, cell adhesion and extracellular matrix remodelling. Most notably, four genes—COL1A2, KYNU, ACTG2 and NPPB—were differentially expressed in high and non-aggressive cell lines for all the cancer-related phenotypes investigated, suggesting that they might have important roles in the process of osteosarcoma tumorigenesis. At the miRNA level, miR-199b-5p and mir-100-3p were downregulated in the highly aggressive cell lines, whereas miR-155-5p, miR-135b-5p and miR-146a-5p were upregulated. miR-135b-5p and miR-146a-5p were further predicted to be linked to the metastatic capacity of the disease.

Interpretation:

The detailed characterisation of cell line phenotypes will support the selection of models to use for specific preclinical investigations. The differentially expressed mRNAs and miRNAs identified in this study may represent good candidates for future therapeutic targets. To our knowledge, this is the first time that expression profiles are associated with functional characteristics of osteosarcoma cell lines.     

lncRNA RHPN1-AS1靶向miR-485-5p调控骨肉瘤细胞增殖、凋亡、迁移、侵袭及其分子机制

目的:探讨lncRNA RHPN1反义RNA1（RHPN1-AS1）靶向miR-485-5p对骨肉瘤细胞增殖、凋亡、迁移、侵袭的影响和机制。方法:实时荧光定量PCR（qRT-PCR）检测20例骨肉瘤组织与其对应的癌旁组织、人正常成骨细胞hFOB1.19以及3种骨肉瘤细胞（U-2OS、SAOS-2、HOS）中RHPN1-AS1和miR-485-5p的表达水平。利用脂质体转染法将RHPN1-AS1小干扰RNA（si-RHPN1-AS1）、小干扰RNA阴性对照（si-NC）、miR-485-5p模拟物（miR-485-5p mimics）、miRNA阴性对照（miR-NC）分别转染U-2OS细胞,四甲基偶氮唑蓝（MTT）法检测细胞活力,流式细胞术检测细胞凋亡,Transwell实验检测细胞迁移和侵袭能力,蛋白质印记（Western blot）检测细胞周期蛋白D1（Cyclin D1）、p21、p27、B细胞淋巴瘤/白血病-2（Bcl-2）、Bcl-2相关X蛋白（Bax）、基质金属蛋白酶2（MMP-2）、基质金属蛋白酶9（MMP-9）和基质金属蛋白酶14（MMP-14）蛋白的表达。双荧光素酶报告基因实验和qRT-PCR验证RHPN1-AS1和miR-485-5p的靶向调控关系。结果:与癌旁组织比较,骨肉瘤组织中RHPN1-AS1的表达水平显著升高,miR-485-5p的表达水平显著降低（P＜0.05）;与hFOB1.19细胞比较,3种骨肉瘤细胞中RHPN1-AS1的表达水平显著升高,miR-485-5p的表达水平显著降低（P＜0.05）。与si-NC组比较,si-RHPN1-AS1组U-2OS细胞的活力显著降低,迁移和侵袭能力显著降低,细胞凋亡率显著升高,Cyclin D1、Bcl-2、MMP-2、MMP-9和MMP-14蛋白的表达水平显著降低,p21、p27和Bax蛋白的表达水平显著升高（P＜0.05）;与miR-NC组比较,miR-485-5p组U-2OS细胞的活力显著降低,迁移和侵袭能力显著降低,细胞凋亡率显著升高,Cyclin D1、Bcl-2、MMP-2和MMP-9蛋白的表达水平显著降低,p21和Bax蛋白的表达水平显著升高（P＜0.05）。RHPN1-AS1靶向负性调控miR-485-5p表达。干扰miR-485-5p表达逆转了抑制lncRNA RHPN1-AS1表达对骨肉瘤U-2OS细胞增殖、凋亡、迁移和侵袭的影响。结论:抑制RHPN1-AS1通过上调miR-485-5p抑制骨肉瘤细胞增殖、迁移和侵袭,诱导细胞凋亡。     

MicroRNA cloning and sequencing in osteosarcoma cell lines: differential role of miR-93

Background

Studies show that abnormalities in non-coding genes can contribute to carcinogenesis; microRNA levels may modulate cancer growth and metastatic diffusion.

Method

MicroRNA libraries were built and sequenced from two osteosarcoma cell lines (MG-63 and 143B), which differ in proliferation and transmigration. By cloning and transfection, miR-93, expressed in both cell lines, was then investigated for its involvement in osteosarcoma progression.

Results

Six of the 19 miRNA identified were expressed in both cell lines with higher expression levels of miR-93 in 143B and in primary osteosarcoma cultures compared to normal osteoblasts. Interestingly, levels of miR-93 were significantly higher in metastases from osteosarcoma than in paired primary tumours. When 143B and MG-63 were transfected with miR-93, clones appeared to respond differently to microRNA overexpression. Ectopic expression of miR-93 more significantly increased cell proliferation and invasivity in 143B than in MG-63 clones. Furthermore, increased mRNA and protein levels of E2F1, one of the potential miR-93 targets, were seen in osteosarcoma cellular clones and its involvement in 143B cell proliferation was confirmed by E2F1 silencing.

Conclusion

Although further studies are needed to evaluate miRNA involvement in osteosarcoma progression, miR-93 overexpression seems to play an important role in osteosarcoma cell growth and invasion.     

Hsa-miR-181a-5p Expression and Effects on Cell Proliferation in Gastric Cancer

Purpose: MicroRNAs (miRNAs) are small endogenous, non-coding, single-stranded RNAs (approximately22 nt). Accumulating evidence has shown that aberrant miRNA expression is pronounced and correlatedwith gastric cancer genesis and progression. Materials and Methods: Expression levels of miR-181a-5p in GCtissues and cell lines were assessed by qRT-PCR and tested for correlation with clinical features. In addition,effects of miR-181a-5p on GC cell growth were investigated. Results: Our findings indicate that miR-181a-5pis upregulated in GC, in correlation with lymph node invasion, nerve invasion and vascular invasion (P<0.05).Enforced expression of miR-181a -5p promoted cell proliferation ability. Conclusions: This study suggested thatincreased miR-181a-5p is related to GC progression. MiR-181a-5p may represent a potential therapeutic targetfor GC.     

LINC00649通过miR-424-5p/IGF1R轴调控内质网应激介导的宫颈癌细胞凋亡

目的探讨LINC00649/miR-424-5p/IGF1R对内质网应激(ERs)介导的宫颈癌(CC)细胞凋亡的影响。方法从GEO数据库中获取CC相关的数据,并分析差异表达的miRNAs。利用生物信息学数据库预测miR-424-5p的上、下游靶点,将LINC00649和IGF1R纳入研究,随后双荧光素酶实验进一步验证靶向关系。qRT-PCR检测LINC00649、miR-424-5p和IGF1R在CC组织和细胞中的表达水平。CCK-8和流式细胞术分别评估CC细胞增殖和凋亡变化。Western blot检测ERs相关蛋白GRP78、CHOP和Caspase-12的表达。结果与癌旁组织和H8细胞相比,LINC00649和IGF1R在CC组织和细胞中表达上调,而miR-424-5p下调(均P<0.05)。LINC00649的异常高表达与CC患者的预后不良有关,敲减LINC00649可通过促进ERs来抑制CC细胞活力,诱导细胞凋亡(均P<0.05)。LINC00649吸附miR-424-5p上调IGF1R的表达。miR-424-5p抑制剂或过表达IGF1R均可部分逆转敲减LINC00649对CC细胞的影响(均P<0.05)。结论 LINC00649能够通过miR-424-5p/IGF1R抑制CC细胞的ERs过程进而减少细胞凋亡,提高细胞活力。     

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.     

利多卡因通过调控lncRNA TTN-AS1/miR-524-5p表达对骨肉瘤细胞增殖、迁移和侵袭的影响

目的:研究利多卡因对骨肉瘤细胞MG-63增殖、迁移和侵袭的影响,并探索其作用机制。方法:使用1 mmol/L、5 mmol/L、10 mmol/L浓度利多卡因处理MG-63细胞,MTT法检测细胞增殖,Transwell小室法检测细胞迁移和侵袭,Western blot检测细胞周期蛋白D1（CyclinD1）、p21、基质金属蛋白酶-2（MMP-2）、基质金属蛋白酶-9（MMP-9）蛋白表达,qRT-PCR检测长链非编码RNA TTN-AS1（TTN-AS1）和微小RNA-524-5p（miR-524-5p）表达,starBase软件结合双荧光素酶报告实验分析TTN-AS1与miR-524-5p的靶向关系。MG-63细胞中转染si-TTN-AS1、miR-524-5p或pcDNA-TTN-AS1（并进行10 mmol/L利多卡因处理）,观察细胞的增殖、迁移、侵袭。结果:不同浓度利多卡因明显提高细胞增殖抑制率和p21蛋白表达量（P＜0.05）,显著减少迁移细胞数、侵袭细胞数和CyclinD1、MMP-2、MMP-9蛋白表达量（P＜0.05）,均呈剂量依赖性。TTN-AS1可靶向调控miR-524-5p表达。抑制TTN-AS1表达与miR-524-5p过表达显著增加MG-63细胞的增殖抑制率和p21蛋白表达量（P＜0.05）,明显降低迁移细胞数、侵袭细胞数和CyclinD1、MMP-2、MMP-9蛋白表达量（P＜0.05）。TTN-AS1过表达逆转了利多卡因对MG-63细胞增殖、迁移、侵袭和CyclinD1、MMP-2、MMP-9蛋白表达的抑制作用,以及对miR-524-5p、p21蛋白表达的促进作用。结论:利多卡因通过调控lncRNA TTN-AS1/miR-524-5p表达抑制骨肉瘤MG-63细胞增殖、迁移和侵袭。     

MicroRNA-1226-3p has a tumor-promoting role in osteosarcoma

Osteosarcoma is a malignant bone tumor that commonly occurs in young individuals. It accounts for 10% of solid tumors in those who are 15–19 years old. MicroRNA (miRNA/miR) dysregulation serves a crucial role in the molecular mechanism of osteosarcoma. The present study reported a novel miRNA (miR-1226-3p) and investigated its function in osteosarcoma. miR-1226-3p mimics and miR-1226-3p antisense oligonucleotides were transfected into human osteosarcoma SaOS-2 cells to alter miR-1226-3 expression, while the hFOB 1.19 cell line was used as the control. The apoptosis rate was analyzed using a dead cell apoptosis kit. TNF receptor-associated factor 3 (TRAF3) protein expression was assayed by western blotting. The results of bioinformatics and clinical specimen analyses revealed that higher expression levels of miR-1226-3p were associated with lower survival rates. Additionally, the results of experiments on cultured cells revealed that miR-1226-3p promoted the proliferation of SaOS-2 cells, while miR-1226-3p inhibition decreased cell proliferation and increased apoptosis. Furthermore, it was revealed that miR-1226-3p targeted TRAF3 in SaOS-2 cells. In conclusion, the present study suggested that miR-1226-3p promoted the proliferation of osteosarcoma cells.