NDLI: miR-17-92 Cluster Promotes Cholangiocarcinoma Growth

Content Provider	PubMed Central
Author	Zhu, Hanqing Han, Chang Lu, Dongdong Tong, Wu
Copyright Year	2014
Abstract	miR-17-92 is an oncogenic miRNA cluster implicated in the development of several cancers; however, it remains unknown whether the miR-17-92 cluster is able to regulate cholangiocarcinogenesis. This study was designed to investigate the biological functions and molecular mechanisms of the miR-17-92 cluster in cholangiocarcinoma. In situ hybridization and quantitative RT-PCR analysis showed that the miR-17-92 cluster is highly expressed in human cholangiocarcinoma cells compared with the nonneoplastic biliary epithelial cells. Forced overexpression of the miR-17-92 cluster or its members, miR-92a and miR-19a, in cultured human cholangiocarcinoma cells enhanced tumor cell proliferation, colony formation, and invasiveness, in vitro. Overexpression of the miR-17-92 cluster or miR-92a also enhanced cholangiocarcinoma growth in vivo in hairless outbred mice with severe combined immunodeficiency (SHO-PrkdcscidHrhr). The tumor-suppressor, phosphatase and tensin homolog deleted on chromosome 10 (PTEN), was identified as a bona fide target of both miR-92a and miR-19a in cholangiocarcinoma cells via sequence prediction, 3′ untranslated region luciferase activity assay, and Western blot analysis. Accordingly, overexpression of the PTEN open reading frame protein (devoid of 3′ untranslated region) prevented miR-92a– or miR-19a–induced cholangiocarcinoma cell growth. Microarray analysis revealed additional targets of the miR-17-92 cluster in human cholangiocarcinoma cells, including APAF-1 and PRDM2. Moreover, we observed that the expression of the miR-17-92 cluster is regulated by IL-6/Stat3, a key oncogenic signaling pathway pivotal in cholangiocarcinogenesis. Taken together, our findings disclose a novel IL-6/Stat3–miR-17-92 cluster–PTEN signaling axis that is crucial for cholangiocarcinogenesis and tumor progression.
Related Links	http://dx.doi.org/10.1016/j.ajpath.2014.06.024
Ending Page	2839
Page Count	12
Starting Page	2828
File Format	PDF
ISSN	00029440
e-ISSN	15252191
Journal	The American Journal of Pathology
Issue Number	10
Volume Number	184
Language	English
Publisher	American Society for Investigative Pathology
Publisher Date	2014-10-01
Access Restriction	Open
Rights Holder	American Society for Investigative Pathology
Subject Keyword	Pathology and Forensic Medicine Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Pathology and Forensic Medicine

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