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miR-29a suppresses MCF-7 cell growth by downregulating tumor necrosis factor receptor 1

Yiling Zhao1, Fenghua Yang2, Wenyuan Li3

  • 11 Department of Ultrasound, The Affiliated Hongqi Hospital of Mudanjiang Medical University, Mudanjiang, China.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|February 23, 2017
PubMed

Insights

Tumor necrosis factor receptor 1 (TNFR1) is upregulated in breast cancer. MicroRNA-29a (miR-29a) suppresses tumor growth by targeting TNFR1, inhibiting proliferation and inducing apoptosis.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • Tumor necrosis factor receptor 1 (TNFR1) has contradictory roles in breast cancer, necessitating clarification.
  • Understanding TNFR1's function is crucial for developing targeted breast cancer therapies.

Purpose of the Study:

  • To elucidate the role of TNFR1 in breast cancer.
  • To investigate the regulatory relationship between miR-29a and TNFR1 in breast cancer cells.

Main Methods:

  • Quantitative analysis of TNFR1 expression in breast cancer tissues and cell lines.
  • Small interfering RNA (siRNA) mediated knockdown of TNFR1.
  • Bioinformatic prediction and luciferase reporter assays to confirm miR-29a binding to TNFR1.
  • Overexpression of miR-29a in MCF-7 cells.
  • Western blot analysis of key signaling proteins (NF-κB, cyclinD1, Bcl-2/Bax).

Main Results:

  • TNFR1 expression is significantly increased in human breast cancer.
  • Knockdown of TNFR1 inhibits proliferation, arrests cell cycle, and induces apoptosis.
  • miR-29a expression is inversely correlated with TNFR1 in breast cancer.
  • miR-29a directly targets and downregulates TNFR1, suppressing proliferation and inducing apoptosis in MCF-7 cells.
  • miR-29a counteracts the oncogenic effects of TNFR1 by inactivating the NF-κB pathway.

Conclusions:

  • miR-29a acts as a tumor suppressor in breast cancer by targeting TNFR1.
  • The miR-29a/TNFR1 axis influences breast cancer cell growth via the NF-κB signaling pathway.
  • Targeting the miR-29a/TNFR1 interaction may offer a therapeutic strategy for breast cancer.
Keywords:
MCF-7 cellTumor necrosis factor receptor 1miR-29a

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