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miR-4521-FAM129A axial regulation on ccRCC progression through TIMP-1/MMP2/MMP9 and MDM2/p53/Bcl2/Bax pathways

Xue Feng1, Naimeng Yan2, Weibin Sun3

  • 11Department of Biotechnology, College of Basic Medical Sciences, Dalian Medical University, 116044 Dalian, China.

Cell Death Discovery
|April 25, 2019
PubMed

Insights

Clear cell renal cell carcinoma (ccRCC) progression is driven by FAM129A overexpression and miR-4521 deficiency. This deregulation promotes tumor growth, metastasis, and resistance to treatment, offering new diagnostic and therapeutic targets.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Clear cell renal cell carcinoma (ccRCC) is an aggressive kidney cancer subtype with poor prognosis.
  • Metastasis, chemoresistance, and radiotherapy resistance are hallmarks of ccRCC.
  • Understanding the molecular mechanisms driving ccRCC progression is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the roles of miR-4521 and FAM129A in ccRCC development and progression.
  • To establish the regulatory mechanism between miR-4521 and FAM129A in ccRCC.
  • To explore the potential of targeting this axis for ccRCC diagnosis and treatment.

Main Methods:

  • Analysis of FAM129A and miR-4521 levels in ccRCC patient tumor tissues.
  • In vitro experiments using ccRCC cell lines (786-O and ACHN) involving FAM129A knockdown and miR-4521 overexpression.
  • Investigation of signaling pathways including TIMP-1/MMP2/MMP9 and MDM2/p53/Bcl2/Bax.
  • Direct targeting validation of FAM129A 3'-UTR by miR-4521.

Main Results:

  • FAM129A overexpression and miR-4521 deficiency correlate with advanced TNM stage and Fuhrman grade in ccRCC patients.
  • FAM129A acts as a tumor promoter, while miR-4521 acts as a tumor suppressor in ccRCC.
  • FAM129A knockdown and miR-4521 overexpression reduced in vitro migration, invasion, and proliferation of ccRCC cells.
  • These effects were mediated by the TIMP-1/MMP2/MMP9 and MDM2/p53/Bcl2/Bax pathways.
  • miR-4521 directly targets FAM129A, establishing a negative feedback loop.

Conclusions:

  • The miR-4521-FAM129A axis is a critical regulatory mechanism in ccRCC progression.
  • miR-4521 deficiency leads to FAM129A upregulation, enhancing ccRCC cell migration, invasion, and proliferation.
  • This axis presents potential therapeutic targets for ccRCC diagnosis and treatment.

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