Regulation of tumor cell migration and invasion by the H19/let-7 axis is antagonized by metformin-induced DNA methylation

The imprinted, developmentally regulated H19 long noncoding RNA has been implicated in the pathogenesis of diverse human cancers, but the underlying mechanisms have remained poorly understood. Here, we report that H19 promotes tumor cell migration and invasion by inhibiting let-7, a potent tumor sup...

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Veröffentlicht in:Oncogene 2015-06, Vol.34 (23), p.3076-3084
Hauptverfasser: Yan, L, Zhou, J, Gao, Y, Ghazal, S, Lu, L, Bellone, S, Yang, Y, Liu, N, Zhao, X, Santin, A D, Taylor, H, Huang, Y
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container_end_page 3084
container_issue 23
container_start_page 3076
container_title Oncogene
container_volume 34
creator Yan, L
Zhou, J
Gao, Y
Ghazal, S
Lu, L
Bellone, S
Yang, Y
Liu, N
Zhao, X
Santin, A D
Taylor, H
Huang, Y
description The imprinted, developmentally regulated H19 long noncoding RNA has been implicated in the pathogenesis of diverse human cancers, but the underlying mechanisms have remained poorly understood. Here, we report that H19 promotes tumor cell migration and invasion by inhibiting let-7, a potent tumor suppressor microRNA that functions to posttranscriptionally suppress the expression of oncogenes that regulate cell growth and motility. We show that H19 depletion impairs, whereas its overexpression enhances the motility and invasiveness of tumor cells. These phenomena occur, at least in part through affecting let-7-mediated regulation of metastasis-promoting genes, including Hmga2 , c-Myc and Igf2bp3 . This H19/let-7-dependent regulation is recapitulated in vivo where co-expressions of oncogenes and H19 exist in both primary human ovarian and endometrial cancers. Furthermore, we provide evidence that the anti-diabetic drug metformin inhibits tumor cell migration and invasion, partly by downregulating H19 via DNA methylation. Our results reveal a novel mechanism underpinning H19-mediated regulation in metastasis and may explain why in some cases increased let-7 expression unexpectedly correlates with poor prognosis, given the widely accepted role for let-7 as a tumor suppressor. Targeting this newly identified pathway might offer therapeutic opportunities.
doi_str_mv 10.1038/onc.2014.236
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subjects 631/337/176/1988
631/67
631/80/84/2336
631/80/86
Antidiabetics
Apoptosis
c-Myc protein
Carcinogenesis
Cell adhesion & migration
Cell Biology
Cell Line, Tumor
Cell migration
Cell Movement
Deoxyribonucleic acid
Diabetes mellitus
DNA
DNA methylation
DNA Methylation - drug effects
Endometrial cancer
Endometrial Neoplasms - genetics
Endometrial Neoplasms - metabolism
Endometrial Neoplasms - pathology
Endometrium
Female
Gene Expression Regulation, Neoplastic
Gene regulation
Genetic aspects
Health aspects
HEK293 Cells
Human Genetics
Humans
Internal Medicine
Invasiveness
Medicine
Medicine & Public Health
Metastases
Metastasis
Metformin
Metformin - pharmacology
MicroRNA
MicroRNAs
MicroRNAs - genetics
MicroRNAs - metabolism
miRNA
Motility
Myc protein
Neoplasm Invasiveness
Oncology
Ovarian Neoplasms - genetics
Ovarian Neoplasms - metabolism
Ovarian Neoplasms - pathology
Properties
RNA, Long Noncoding - genetics
RNA, Long Noncoding - metabolism
short-communication
Signal Transduction
Transcription (Genetics)
Transcription factors
Tumor cells
Tumor suppressor genes
Tumors
title Regulation of tumor cell migration and invasion by the H19/let-7 axis is antagonized by metformin-induced DNA methylation
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