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。     

Knockdown of SOX2OT inhibits the malignant biological behaviors of glioblastoma stem cells via up-regulating the expression of miR-194-5p and miR-122

Background

Accumulating evidence has highlighted the potential role of long non-coding RNAs (lncRNAs) in the biological behaviors of glioblastoma stem cells (GSCs). Here, we elucidated the function and possible molecular mechanisms of the effect of lncRNA-SOX2OT on the biological behaviors of GSCs.

Results

Real-time PCR demonstrated that SOX2OT expression was up-regulated in glioma tissues and GSCs. Knockdown of SOX2OT inhibited the proliferation, migration and invasion of GSCs, and promoted GSCs apoptosis. MiR-194-5p and miR-122 were down-regulated in human glioma tissues and GSCs, and miR-194-5p and miR-122 respectively exerted tumor-suppressive functions by inhibiting the proliferation, migration and invasion of GSCs, while promoting GSCs apoptosis. Knockdown of SOX2OT significantly increased the expression of miR-194-5p and miR-122 in GSCs. Dual-luciferase reporter assay revealed that SOX2OT bound to both miR-194-5p and miR-122. SOX3 and TDGF-1 were up-regulated in human glioma tissues and GSCs. Knockdown of SOX3 inhibited the proliferation, migration and invasion of GSCs, promoted GSCs apoptosis, and decreased TDGF-1 mRNA and protein expression through direct binding to the TDGF-1 promoter. Over-expression of miR-194-5p and miR-122 decreased the mRNA and protein expression of SOX3 by targeting its 3’UTR. Knockdown of TDGF-1 inhibited the proliferation, migration and invasion of GSCs, promoted GSCs apoptosis, and inhibited the JAK/STAT signaling pathway. Furthermore, SOX3 knockdown also inhibited the SOX2OT expression through direct binding to the SOX2OT promoter and formed a positive feedback loop.

Conclusion

This study is the first to demonstrate that the SOX2OT-miR-194-5p/miR-122-SOX3-TDGF-1 pathway forms a positive feedback loop and regulates the biological behaviors of GSCs, and these findings might provide a novel strategy for glioma treatment.

     

miR-548d抑制骨肉瘤细胞的增殖和迁移

目的:探讨miR-548d对骨肉瘤细胞增殖和迁移的影响。方法:通过Real time PCR及Western blot检测miR-548d和KRAS在30例骨肉瘤组织以及293、MG63和U2OS细胞中的表达情况。对30例骨肉瘤组织中miR-548d和KRAS含量的相关性进行分析，随后通过报告基因实验印证miR-548d对KRAS的靶向作用。MG63细胞中分别过表达或沉默miR-548d后，通过Western blot实验分析KRAS的变化情况，MTT实验观察miR-548d对细胞增殖的影响，Transwell实验观察miR-548d对其迁移能力的影响。结果:骨肉瘤组织及细胞中miR-548d表达较低，KRAS表达较高。在骨肉瘤组织中miR-548d与KRAS的表达呈负相关。报告基因实验证明miR-548d可以直接打靶KRAS。Western blot指出miR-548d可以抑制KRAS的表达。最后MTT和Transwell实验指出miR-548d可以抑制MG63细胞的增殖与迁移。结论:miR-548d可以通过打靶KRAS抑制骨肉瘤细胞的增殖和迁移。     

miR-30c Impedes Glioblastoma Cell Proliferation and Migration by Targeting SOX9

miR-30c has been acknowledged as a tumor suppressor in various human cancers, such as ovarian cancer, gastric cancer, and prostate cancer. However, the role of miR-30c in glioblastoma (GBM) needs to be investigated. In our study, we found that the expression of miR-30c was significantly downregulated in GBM tissues and cell lines. We found that overexpression of miR-30c inhibited cellular proliferation of GBM cells in vitro and in vivo. More GBM cells were arrested in the G₀ phase after miR-30c overexpression. Moreover, we showed that miR-30c overexpression suppressed the migration and invasion of GBM cells. Mechanistically, we found that SOX9 was a direct target of miR-30c in GBM cells. Overexpression of miR-30c inhibited the mRNA and protein levels of SOX9 in GBM cells. Moreover, there was a negative correlation between the expression of miR-30c and SOX9 in GBM tissues. Finally, we showed that restoration of SOX9 in GBM cells reversed the proliferation, migration, and invasion of GBM cells transfected with miR-30c mimic. Collectively, our results demonstrated that miR-30c suppressed the proliferation, migration, and invasion of GBM cells via targeting SOX9.     

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.     

MicroRNA-802 Promotes Osteosarcoma Cell Proliferation by Targeting p27

MicroRNAs have been demonstrated to regulate proliferation and apoptosis in many types of cancers, butbiological functions in osteosarcomas remain relatively unknown. Here, we found expression of miR-802 to beup-regulated in osteosarcoma tissues in comparison with adjacent normal tissues. Enforced expression of miR-802was able to promote cell proliferation in U2OS and MG63 cells, while miR-802 antisense oligonucleotides (antisensemiR-802) inhibited cell proliferation. At the molecular level, our results further revealed that expression of p27,a negative cell-cycle regulator, was negatively regulated by miR-802. Therefore, the data reported here indicatethat miR-802 is an important regulator in osteosarcoma, our findings contributing to a better understanding ofimportant mis-regulated miRNAs in this tumour type.     

miR-145 inhibits osteosarcoma cells proliferation and invasion by targeting ROCK1

MicroRNAs (miRNAs) contribute to the development and progression of various types of human cancers. The aim of this study was to study the role of miR-145 and to identify its functional target gene in osteosarcoma (OS) cells. We found that miR-145 was reduced in OS tissues and cell lines. Enforced expression of miR-145 inhibited cell proliferation, migration, and invasion abilities of MG-63 cells. Furthermore, we revealed that Rho-associated protein kinase 1 (ROCK1) was a target of miR-145 in OS. Finally, we found that silencing of ROCK1 performed similar effects with miR-145 in MG-63 cells, and ROCK1 was inversely correlated with miR-145 in OS tissues. Collectively, these data indicate that miR-145 may act as a tumor suppressor and contributes to the progression of OS through targeting ROCK1.     

miR-369-5p抑制肝细胞癌细胞增殖、迁移及侵袭

目的:探讨miR-369-5p在肝细胞癌（hepatocellular carcinoma,HCC）中的表达情况、临床意义,观察miR-369-5p对HCC细胞增殖、迁移及侵袭的影响及其作用机制。方法:实时定量PCR检测miR-369-5p在HCC组织与相应癌旁组织、正常肝细胞（L02）与HCC细胞系中的表达情况;CCK-8实验检测MHCC-97H及HCCLM3细胞增殖能力;Transwell实验检测MHCC-97H及HCCLM3细胞迁移及侵袭能力;Targetscan数据库预测p21活化激酶4（p21 activated kinase 4,PAK4）为miR-369-5p下游靶基因;用双荧光素酶实验检测荧光素酶活性;蛋白免疫印迹试验检测MHCC-97H及HCCLM3细胞中PAK4的蛋白表达水平。结果:miR-369-5p在HCC组织及细胞系中均明显低表达,低表达miR-369-5p与肿瘤大小、TNM分期、微血管浸润相关;在MHCC-97H及HCCLM3细胞中过表达miR-369-5p抑制细胞的增殖、迁移及侵袭能力;通过生物信息学工具预测PAK4是miR-369-5p的下游靶基因;在MHCC-97H及HCCLM3细胞中过表达miR-369-5p下调PAK4蛋白的表达。结论:在HCC中miR-369-5p表达下调且其低表达与HCC恶性病理特征有关,在HCC中过表达miR-369-5p可通过下调PAK4表达抑制细胞增殖、迁移及侵袭。     

MicroRNA-128 promotes proliferation in osteosarcoma cells by downregulating PTEN

MicroRNAs are a class of small noncoding RNAs that function as critical gene regulators through targeting mRNAs for translational repression or degradation. Several studies have indicated that abnormal expression of miRNAs occurs frequently in human osteosarcoma. In the present study, we found that miR-128 expression was significantly increased in osteosarcoma tissues compared to adjacent normal tissues. Ectopic overexpression of miR-128 significantly promoted while suppression of miR-128 by its antisense inhibited the proliferation of MG63 and U2OS cells. At the molecular level, our results demonstrated that miR-128 overexpression could repress expression of PTEN by directly targeting PTEN 3'-untranslated region. Consistently, downstream AKT signaling was altered by miR-128 overexpression or knockdown. Therefore, our results suggest that miR-128 plays an important role in the proliferation of human osteosarcoma cells by directly regulation of PTEN/AKT signaling.     

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。     

miR-139-5p靶向GPR56抑制骨肉瘤细胞增殖、迁移和侵袭的实验研究

目的:研究miR-139-5p对骨肉瘤细胞增殖、迁移和侵袭的影响,并探讨其机制。方法:运用qRT-PCR检测软骨肉瘤细胞中miR-139-5p、GPR56的mRNA表达;Western blot检测细胞中GPR56的蛋白表达;将miR-139-5p组（转染miR-139-5p mimics）、miR-NC组（转染miR-NC）、si-NC组（转染si-NC）、si-GPR56组（转染si-GPR56）、miR-139-5p+pcDNA3.1组（miR-139-5p mimics和pcDNA3.1共转染）、miR-139-5p+pcDNA3.1-GPR56组（miR-139-5p mimics和pcDNA3.1-GPR56共转染）,均以脂质体法转染至U-2OS细胞;MTT法检测各组细胞的增殖;Transwell检测各组细胞的迁移、侵袭。结果:与人正常成骨细胞hFOB1.19相比,人骨肉瘤细胞U-2OS中miR-139-5p表达显著降低,GPR56表达显著升高（P＜0.05）。过表达miR-139-5p、敲减GPR56均可明显抑制U-2OS细胞增殖、迁移、侵袭;GPR56是miR-139-5p的靶点。过表达GPR56可逆转miR-139-5p对U-2OS细胞增殖、迁移、侵袭的抑制作用。结论:miR-139-5p可抑制骨肉瘤细胞增殖、迁移、侵袭,其机制可能与靶向GPR56有关,将可为骨肉瘤的治疗提供新靶点。     

SRC抑制胶质母细胞瘤的增殖、迁移、侵袭和干性维持的分子机制

目的 研究SRC在胶质母细胞瘤发生发展中的作用,并初步探讨可能的分子机制。方法  采用生物信息学的方法分析SRC在胶质母细胞瘤中的表达变化;利用shRNA下调胶质瘤母细胞系U87MG中SRC的表达,通过RT-PCR和免疫印迹法验证其抑制效率,并筛选出稳定干涉的细胞株;采用WST-1法、划痕愈合实验和Transwell迁移实验检测SRC shRNA干涉后细胞增殖、迁移和侵袭能力的变化;利用干细胞培养液筛选出SRC shRNA稳定干涉的胶质瘤干细胞,观察SRC shRNA对肿瘤干细胞干性的影响;利用细胞免疫荧光法观察干性基因SOX2的表达变化。结果 在胶质母细胞瘤标本中SRC的表达水平高于对照组,筛选到两条有效的SRC shRNA序列;通过shRNA下调SRC的表达后可以显著抑制胶质瘤母细胞U87MG的增殖、迁移、侵袭和肿瘤干细胞干性维持,并且可以明显抑制SOX2的表达。结论 SRC通过调控胶质母细胞瘤的增殖、迁移、侵袭和干性维持影响其发生发展,其对干性维持的作用可能是通过影响SOX2的表达实现的。     

HOTAIRM1靶向miR-129-5p对胶质瘤细胞增殖、迁移、侵袭的影响

目的:研究长链非编码RNA HOTAIRM1（lncRNA HOTAIRM1）与微小RNA-129-5p（miR-129-5p）的靶向关系及其对胶质瘤细胞增殖、迁移、侵袭的影响。 方法:荧光定量PCR（qPCR）检测HOTAIRM1和miR-129-5p在人正常脑组织和胶质瘤组织中的表达。建立抑制HOTAIRM1表达细胞株，研究其对U251细胞增殖、凋亡、迁移及侵袭的影响。MTT法检测细胞增殖；流式细胞仪检测细胞凋亡；Transwell小室法检测细胞迁移和侵袭；蛋白质印迹法（Western blot）检测细胞周期蛋白D1（Cyclin D1）、p21、B细胞淋巴瘤/白血病-2（Bcl-2）和Bcl-2相关X蛋白（Bax）、上皮钙黏素（E-cadherin）、基质金属蛋白酶-2（MMP-2）水平。生物学信息预测和双荧光素酶报告基因法分析HOTAIRM1和miR-129-5p之间的靶向关系。共转染si-HOTAIRM1和anti-miR-129-5p，观察抑制miR-129-5p表达对抑制HOTAIRM1表达诱导的U251细胞增殖、凋亡、迁移及侵袭的影响。 结果:HOTAIRM1在胶质瘤组织中的表达明显上调（P<0.05），miR-129-5p表达下调（P<0.05）。抑制HOTAIRM1表达显著降低U251细胞24 h、48 h、72 h的细胞活性、迁移细胞数、侵袭细胞数及Cyclin D1、Bcl-2、MMP-2蛋白表达量（P<0.05），明显增加U251细胞凋亡率和p21、Bax、E-cadherin蛋白表达量（P<0.05）。miR-129-5p是HOTAIRM1的靶基因。上调或下调HOTAIRM1表达明显调控miR-129-5p表达（P<0.05）。抑制miR-129-5p表达逆转了抑制HOTAIRM1表达对U251细胞24 h、48 h、72 h的细胞活性、迁移细胞数、侵袭细胞数及Cyclin D1、MMP-2、Bcl-2蛋白表达的抑制作用，并逆转了抑制HOTAIRM1表达对U251细胞p21、E-cadherin、Bax蛋白表达和细胞凋亡率的促进作用。 结论:lncRNA HOTAIRM1通过靶向miR-129-5p影响胶质瘤细胞增殖、凋亡、迁移和侵袭。     

敲减lncRNA RP1-261G23.7抑制胶质瘤细胞增殖和迁移及其机制探讨北大核心

目的:探讨长链非编码RNA(long non-coding RNA,lncRNA)RP1-261G23.7对人胶质瘤细胞增殖及迁移的影响及可能的调控机制。方法:采用GEPIA数据库分析RP1-261G23.7在胶质瘤组织中的相对表达。采用qRT-PCR检测RP1-261G23.7在4种胶质瘤细胞系(U87MG、SNB-19、U251、LN382)中的相对表达。采用Lipofectamine3000向胶质瘤细胞U87MG中单独转染si-RP1-261G23.7质粒(si-RP1-261G23.7组)和si-NC对照质粒(si-NC组)。采用CCK-8实验和细胞划痕实验检测转染后U87MG细胞的增殖及迁移能力。采用生物信息学、qRT-PCR和双荧光素酶报告基因实验研究RP1-261G23.7和miR-525-5p表达的关系。Western blotting检测NF-κB信号通路蛋白的表达。结果:与正常组织相比,RP1-261G23.7在胶质瘤组织中表达上调(P<0.01)。与人脑星型胶质正常细胞系(HEB)相比,RP1-261G23.7在四种胶质瘤细胞系中表达均上调(P<0.01),U87MG细胞中RP1-261G23.7相对表达量最高(P<0.01)。与si-NC组相比,敲减RP1-261G23.7显著抑制了U87MG细胞的增殖(P<0.05)和划痕愈合(P<0.01)。RP1-261G23.7能够直接互补结合miR-525-5p(P<0.01)。与si-NC组相比,敲减RP1-261G23.7表达显著促进了U87MG细胞中miR-525-5p的表达(P<0.01),NF-κB信号通路蛋白表达显著下降(P<0.01)。结论:胶质瘤组织和细胞系中RP1-261G23.7表达明显上调,敲减RP1-261G23.7通过促进miR-525-5p表达、干扰NF-κB信号通路活化,抑制胶质瘤U87MG细胞的增殖和迁移,可能为胶质瘤的靶向治疗开辟新的路径。     

Association between miR-212-3p and SOX11, and the effects of miR-212-3p on cell proliferation and migration in mantle cell lymphoma

To the best of our knowledge, the effect of miR-212-3p on sex-determining region Y-box 11 (SOX11) expression has not been previously investigated and how this effect affects cell proliferation and migration in lymphoma remains unclear. The present study aimed to assess the association between microRNA-212-3p (miR-212-3p) and SOX11, and the effects of miR-212-3p on cell proliferation and migration in mantle cell lymphoma. Cancer tissue and corresponding paracancerous tissue samples were collected from 65 patients with mantle cell lymphoma. The mRNA expression levels of miR-212-3p and SOX11 were analyzed using quantitative PCR, and SOX11 protein expression was determined using western blotting. Following transfection, the miR-212-3p mimic group exhibited a significantly lower SOX11 mRNA and protein expression than the miR-NC group. After 48–72 h of transfection, cell proliferation in the miR-212-3p mimic group was significantly lower than that in the miR-NC group. Furthermore, the miR-212-3p mimic group exhibited significantly lower cell invasion and significantly higher apoptosis than the miR-NC group. The current results suggested that miR-212-3p inhibited lymphoma cell proliferation and migration, and promoted their apoptosis by specifically regulating SOX11. Therefore, miR-212-3p may serve as a novel therapeutic target and marker for lymphoma.     

miR-185通过靶向调控CDC42基因表达抑制骨肉瘤MG63细胞的增殖和迁移

目的： 分析miR-185以及细胞分裂周期蛋白42 （CDC42）在骨肉瘤组织和细胞中的表达情况,初步探究miR-185是否通过调控CDC42影响骨肉瘤MG63细胞的增殖与迁移。 方法： 选取2020年1月至2021年1月于衡水市第四人民医院经病理确诊为骨肉瘤的的28例患者的癌组织及癌旁组织,采用免疫组化法检测骨肉瘤组织中CDC42的表达,采用qPCR法检测骨肉瘤组织中miR-185的表达。双荧光素酶报告基因实验验证CDC42基因与miR-185间的靶向关系。根据转染物不同,将MG63细胞分为miR-185 mimic组、miR-NC组、miR-185 inhibitor组、NC-inhibitor组、CDC42组（转染CDC42过表达载体）及阴性对照（NC）组,采用划痕愈合实验、CCK-8法和流式细胞术分别检测miR-185和CDC42表达对MG63细胞迁移、增殖和周期的影响。构建骨肉瘤MG63细胞裸鼠移植瘤模型,采用免疫组化法、qPCR法和WB法检测过表达或敲降miR-185对移植瘤组织中Ki67与CDC42表达的影响。 结果： 与癌旁组织相比,骨肉瘤组织中miR-185表达明显降低,而CDC42表达显著升高（均P<0.01）。CDC42是miR-185的靶基因。与对照组相比,miR-185 mimic组MG63细胞的迁移和增殖能力均受到抑制（均P<0.01）,而CDC42组MG63细胞的迁移和增殖能力均升高、细胞周期阻滞于S期（均P<0.01）;与miR-185组相比,miR-185+CDC42组MG63细胞的迁移和增殖能力均升高、S期细胞比例升高（均P<0.01）。与对照组相比,miR-18 5 mimic组移植瘤组织中Ki67、CDC42表达均显著降低（均P<0.01）,而miR-185 inhibitor组则相反（均P<0.01）。 结论： 在骨肉瘤组织中,miR-185呈低表达而CDC42呈高表达,miR-185能够通过负调控 CDC42的表达,从而抑制骨肉瘤MG63细胞的增殖和迁移。     

miR-143-3p靶向KRAS阻滞PI3K/Akt信号通路抑制分化型甲状腺癌细胞增殖、侵袭和迁移

目的:探讨miR-143-3p对分化型甲状腺癌细胞增殖、侵袭和迁移的影响及其作用机制。方法:采用qRT-PCR检测miR-143-3p在30例分化型甲状腺癌组织和对应的癌旁组织,以及人分化型甲状腺癌细胞（TCP-1、FTC-133、SW579、BCPAP）和甲状腺滤泡上皮正常细胞（Nthy-ori3-1）中的表达水平。将miR-143-3p mimic和miR-143-3p mimic+pcDNA3.1-KRAS转染于FTC-133细胞中,采用CCK-8检测FTC-133细胞增殖活力;Transwell检测FTC-133细胞侵袭和迁移能力。双荧光素酶报告基因验证miR-143-3p和KRAS的靶向关系。Western blot检测蛋白的表达水平。结果:miR-143-3p在分化型甲状腺癌组织中的表达水平明显低于对应的癌旁组织。miR-143-3p在分化型甲状腺癌细胞系中的表达水平低于甲状腺滤泡上皮正常细胞的表达,尤其在FTC-133细胞中表达最低。过表达miR-143-3p显著抑制了FTC-133细胞增殖、侵袭和迁移能力。此外,双荧光素酶报告基因证实,KRAS为miR-143-3p的靶基因。进一步,过表达KRAS通过激活PI3K/Akt信号通路缓解了仅过表达miR-143-3p对FTC-133细胞增殖、侵袭和迁移能力的抑制作用。结论:过表达miR-143-3p通过靶向KRAS且阻滞PI3K/Akt信号通路,进而抑制分化型甲状腺癌细胞恶性生物学行为。