MiR-143 and MiR-145 regulate IGF1R to suppress cell proliferation in colorectal cancer.

MiR-143 and MiR-145 regulate IGF1R to suppress cell proliferation in colorectal cancer.
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DOI:
10.1371/journal.pone.0114420
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Wang Y
Wang Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Su J;Liang H;Yao W;Wang N;Zhang S;Yan X;Feng H;Pang W;Wang Y;Wang X;Fu Z;Liu Y;Zhao C;Zhang J;Zhang CY;Zen K;Chen X;Wang Y

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胰岛素样生长因子 1 受体 (IGF1R) 是一种跨膜受体,由胰岛素样生长因子 1 (IGF-1) 和称为 IGF-2 的相关激素激活。它属于一大类酪氨酸激酶受体,在结直肠癌的病因和进展中发挥着重要作用。在这项研究中,我们使用生物信息学分析来寻找可能靶向 IGF1R 的 miRNA。我们在 IGF1R 基因的 3'-非翻译区 (3'-UTR) 中鉴定了 miR-143 和 miR-145 (miR-143/145) 的特定靶位点。这些 miRNA 属于 miRNA 簇的成员,据报道这些 miRNA 具有肿瘤抑制活性。与生物信息学分析一致,我们发现结直肠癌组织中 miR-143/145 水平与 IGF1R 蛋白水平之间存在负相关。通过在Caco2、HT29和SW480结直肠癌细胞中过表达miR-143/145,我们实验验证了miR-143/145直接识别IGF1R转录本的3'-UTR并调节IGF1R表达。此外,通过体外细胞增殖测定检查了 miR-143/145 靶向 IGF1R 的生物学后果。我们证明 miR-143/145 对 IGF1R 的抑制抑制了 Caco2 细胞的增殖。综上所述,我们的研究结果为 miR-143/145 簇通过抑制 IGF1R 翻译作为结直肠癌肿瘤抑制因子的作用提供了证据。
Insulin-like growth factor 1 receptor (IGF1R) is a transmembrane receptor that is activated by insulin-like growth factor 1 (IGF-1) and by a related hormone called IGF-2. It belongs to the large class of tyrosine kinase receptors and plays an important role in colorectal cancer etiology and progression. In this study, we used bioinformatic analyses to search for miRNAs that potentially target IGF1R. We identified specific target sites for miR-143 and miR-145 (miR-143/145) in the 3′-untranslated region (3′-UTR) of the IGF1R gene. These miRNAs are members of a cluster of miRNAs that have been reported to exhibit tumor suppressor activity. Consistent with the bioinformatic analyses, we identified an inverse correlation between miR-143/145 levels and IGF1R protein levels in colorectal cancer tissues. By overexpressing miR-143/145 in Caco2, HT29 and SW480 colorectal cancer cells, we experimentally validated that miR-143/145 directly recognizes the 3′-UTR of the IGF1R transcript and regulates IGF1R expression. Furthermore, the biological consequences of the targeting of IGF1R by miR-143/145 were examined by cell proliferation assays in vitro. We demonstrated that the repression of IGF1R by miR-143/145 suppressed the proliferation of Caco2 cells. Taken together, our findings provide evidence for a role of the miR-143/145 cluster as a tumor suppressor in colorectal cancer through the inhibition of IGF1R translation.
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