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

L Yan1, J Zhou2, Y Gao3

  • 11] Department of Obstetrics and Gynecology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, P. R. China [2] Department of Obstetrics, Gynecology and Reproductive Sciences, Yale Stem Cell Center, Yale University School of Medicine, New Haven, CT, USA.

Oncogene
|August 5, 2014
PubMed

Insights

The H19 long noncoding RNA promotes cancer cell migration by inhibiting the tumor suppressor let-7 microRNA. Metformin may reduce cancer spread by downregulating H19.

Area of Science:

  • Molecular Biology
  • Oncology
  • RNA Biology

Background:

  • The H19 long noncoding RNA (lncRNA) is implicated in human cancer pathogenesis.
  • Mechanisms underlying H19's role in cancer remain largely unknown.
  • let-7 microRNA acts as a tumor suppressor by inhibiting oncogenes.

Purpose of the Study:

  • To elucidate the mechanism by which H19 influences tumor cell migration and invasion.
  • To investigate the regulatory relationship between H19 and let-7 microRNA.
  • To explore the therapeutic potential of targeting the H19 pathway.

Main Methods:

  • H19 depletion and overexpression in tumor cells.
  • Assessment of cell motility and invasiveness.
  • Analysis of let-7 microRNA levels and its target gene expression (Hmga2, c-Myc, Igf2bp3).
  • In vivo studies using human ovarian and endometrial cancer samples.
  • Investigation of metformin's effect on H19 expression and cancer cell behavior.

Main Results:

  • H19 overexpression enhanced tumor cell migration and invasion, while H19 depletion impaired these processes.
  • H19 was found to inhibit let-7 microRNA activity.
  • Metastasis-promoting genes (Hmga2, c-Myc, Igf2bp3) were regulated by the H19/let-7 axis.
  • H19 and oncogene co-expression was observed in primary ovarian and endometrial cancers.
  • Metformin inhibited tumor cell migration and invasion, partly by downregulating H19 via DNA methylation.

Conclusions:

  • H19 promotes tumor metastasis by suppressing the tumor suppressor let-7 microRNA.
  • This H19/let-7 pathway regulates key oncogenes involved in cell motility.
  • Metformin exhibits anti-metastatic properties by downregulating H19.
  • Targeting the H19/let-7 pathway presents a potential therapeutic strategy for cancer treatment.

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