小RNA
癌症研究
血管生成
生物
上皮-间质转换
癌变
PTEN公司
结直肠癌
肿瘤进展
基因沉默
转移
癌症
信号转导
细胞生物学
PI3K/AKT/mTOR通路
遗传学
基因
生物化学
作者
Tommaso Colangelo,Alessandra Fucci,Carolina Votino,Lina Sabatino,Massimo Pancione,Carmelo Laudanna,Monica Binaschi,Mario Bigioni,Carlo Alberto Maggi,Domenico Parente,Nicola Forte,Vittorio Colantuoni
出处
期刊:Neoplasia
[Elsevier]
日期:2013-09-01
卷期号:15 (9): 1086-1099
被引量:124
摘要
MicroRNA-130b (miR-130b) is involved in several biologic processes; its role in colorectal tumorigenesis has not been addressed so far. Herein, we demonstrate that miR-130b up-regulation exhibits clinical relevance as it is linked to advanced colorectal cancers (CRCs), poor patients' prognosis, and molecular features of enhanced epithelial-mesenchymal transition (EMT) and angiogenesis. miR-130b high-expressing cells develop large, dedifferentiated, and vascularized tumors in mouse xenografts, features that are reverted by intratumor injection of a specific antisense RNA. In contrast, injection of the corresponding mimic in mouse xenografts from miR-130b low-expressing cells increases tumor growth and angiogenic potential while reduces the epithelial hallmarks. These biologic effects are reproduced in human CRC cell lines. We identify peroxisome proliferator-activated receptor γ (PPARγ) as an miR-130b direct target in CRC in vitro and in vivo. Notably, the effects of PPARγ gain- and loss-of-function phenocopy those due to miR-130b down-regulation or up-regulation, respectively, underscoring their biologic relevance. Furthermore, we provide mechanistic evidences that most of the miR-130b-dependent effects are due to PPARγ suppression that in turn deregulates PTEN, E-cadherin, Snail, and vascular endothelial growth factor, key mediators of cell proliferation, EMT, and angiogenesis. Since higher levels of miR-130b are found in advanced tumor stages (III–IV), we propose a novel role of the miR-130b-PPARγ axis in fostering the progression toward more invasive CRCs. Detection of onco-miR-130b and its association with PPARγ may be useful as a prognostic biomarker. Its targeting in vivo should be evaluated as a novel effective therapeutic tool against CRC.
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