LncRNA 606938抑制结直肠癌细胞增殖

LncRNA 606938 Inhibits Proliferation of Colorectal Cancer Cells

近年来,关于长非编码RNA(long non-coding RNAs,lncRNAs)在疾病中的应用研究被广泛关注。LncRNAs被证实在肿瘤治疗中发挥至关重要的作用,通常作为肿瘤因子或抑癌基因参与调控肿瘤的发生发展。课题组前期通过转录组学发现了在结直肠癌中可以作为靶点的新lncRNA 606938,然而关于其在结直肠癌中的功能及作用机制尚不清楚。本研究通过反转录-实时荧光定量PCR(RT-qPCR)实验发现,相比正常结肠上皮细胞,lncRNA 606938在结直肠癌细胞株中低表达。过表达DLD-1与SW620细胞株中lncRNA 606938的表达,结直肠癌细胞的克隆形成能力显著下降(分别下降了97%和54.5%)。流式细胞术的结果显示,lncRNA 606938过表达使细胞周期阻滞在G_(1)期(分别延长了50.5%和63.9%),且促进结直肠癌细胞的凋亡(分别增加了1.9%和3.3%)。Western印迹结果显示,lncRNA 606938过表达之后,结直肠癌细胞中相关癌基因(β-联蛋白、c-Myc、cyclin D1、cyclin D2、cyclin D3、CDK 4、CDK 6)的表达下调,抑癌基因(TRIM33、caspase 2、actived caspase 3)的表达上调。而在沉默lncRNA 606938之后得到相反的结果。在机制方面,通过核糖核酸交互沉降实验(RNA pulldown)、RNA免疫共沉淀(RIP)和功能挽救实验(Rescue)证实,lncRNA 606938可以靶向结合并促进TRIM33的表达,进而促进β-联蛋白的降解,并抑制β-联蛋白及下游的原癌基因c-Myc、cycline D1等的表达,最终抑制结直肠癌的进程。本研究阐明了lncRNA 606938通过靶向TRIM33/β-catenin信号途径抑制结直肠癌细胞增殖与凋亡的分子机制,揭示了lncRNA 606938作为抑癌基因的潜力,为结直肠癌的临床治疗提供了新靶点和新策略。

In recent years,the application of long non-coding RNAs(lncRNAs)in the treatment of diseases has been widely concerned.LncRNAs have been proved to play a crucial role in tumor therapy.They usually act as oncogene or suppressor genes to regulate the occurrence and development of tumors.Previously,our group discovered a new lncRNA 606938 that can be used as a target in colorectal cancer through transcriptome analysis.However,its molecular mechanism in colorectal cancer is still unclear.In this study,RT-qPCR test shows that lncRNA 606938 is low expressed in colorectal cancer cell lines compared with normal colon epithelial cells.The clonogenicity was decreased by 97%and 54.5%in lncRNA 606938 overexpressed DLD-1 and SW620 cells,respectively.The results of flow cytometry assay showed that overexpression of lncRNA 606938 caused cell cycle arrest at G_(1)phase(They were prolonged by 50.5%and 63.9%,respectively)and promoted apoptosis of colorectal cancer cells,which was increased by 1.9%and 3.3%,respectively.Western blot results showed that overexpression of lncRNA 606938 down-regulated the expression of related oncogenes(β-catenin,c-Myc,cyclin D1,cyclin D2,cyclin D3,CDK 4,CDK 6)in colorectal cancer cells,and the expression of tumor suppressor genes(TRIM33,caspase 2,and actived caspase 3)was up-regulated.The above results were reversed after knockdown of lncRNA 606938.Mechanistically,it has been confirmed through RNA pulldown assay,RIP assay,and Rescue assay that lncRNA 606938 can target and promote TRIM33 expression,thereby promoting the degradation ofβ-catenin and blocking the expression ofβ-catenin and its downstream oncogenes such as c-Myc and cycline D1 to inhibit the progression of colorectal cancer.This study elucidates the molecular mechanism by which the lncRNA 606938 targets TRIM33/β-catenin signaling pathway,inhibits the proliferation and promotes the apoptosis of colorectal cancer cells.This study reveals the potential of lncRNA 606938 as a tumor suppressor gene,providing new target and strategies for the clinical treatment of colorectal cancer.