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MYC through miR-17-92 suppresses specific target genes to maintain survival, autonomous proliferation, and a

Yulin Li1, Peter S Choi1, Stephanie C Casey1

  • 1Division of Oncology, Department of Medicine and Pathology, Stanford University, Stanford, CA 94305, USA.

Cancer Cell
|August 14, 2014
PubMed

Insights

The MYC oncogene drives cancer by upregulating miR-17-92, which suppresses key genes. This microRNA prevents cancer cell death and tumor regression, highlighting a new therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • The MYC oncogene is a key driver of tumorigenesis.
  • MYC overexpression leads to uncontrolled cell proliferation and survival, hallmarks of cancer.
  • MYC regulates gene expression through various mechanisms, including microRNA pathways.

Purpose of the Study:

  • To investigate the role of MYC-driven miR-17-92 in maintaining the neoplastic state.
  • To identify the specific target genes of miR-17-92 that contribute to cancer progression.
  • To determine if targeting miR-17-92 can reverse cancer-associated features.

Main Methods:

  • Analysis of MYC's regulation of miR-17-92.
  • Identification of miR-17-92 target genes involved in chromatin regulation and apoptosis.
  • Experimental manipulation of miR-17-92 expression and target gene knockdown in cancer models.
  • Assessment of cellular phenotypes including proliferation, senescence, and apoptosis.

Main Results:

  • MYC maintains the neoplastic state by suppressing chromatin regulatory genes (Sin3b, Hbp1, Suv420h1, Btg1) and the apoptosis regulator Bim via miR-17-92.
  • Enforced miR-17-92 expression blocked MYC-suppression-induced proliferative arrest, senescence, and apoptosis, abrogating tumor regression.
  • Knockdown of miR-17-92 target genes partially mimicked miR-17-92 function by inhibiting senescence and apoptosis.

Conclusions:

  • MYC, through miR-17-92, actively maintains a neoplastic state by suppressing critical regulatory genes.
  • miR-17-92 is a crucial mediator of MYC's oncogenic functions.
  • Targeting the MYC-miR-17-92 axis presents a potential therapeutic strategy for reversing tumorigenesis.

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