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miRNA Pattern in Hypoxic Microenvironment of Kidney Cancer-Role of PTEN

Aleksandra Majewska1,2, Klaudia Brodaczewska1, Aleksandra Filipiak-Duliban1,2

  • 1Laboratory of Molecular Oncology and Innovative Therapies, Military Institute of Medicine, 128 Szaserow Street, 04-141 Warsaw, Poland.

Biomolecules
|May 28, 2022
PubMed

Insights

MicroRNA patterns in renal cancer reveal how hypoxia and PTEN loss impact gene expression. Understanding these changes is crucial for developing targeted cancer therapies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) are key regulators of gene expression, and their dysregulation is implicated in various pathologies, including cancer.
  • The tumor microenvironment, characterized by features like hypoxia, significantly influences cancer progression and therapeutic responses.
  • PTEN (Phosphatase and Tensin homolog) is a critical tumor suppressor whose alterations are common in cancers.

Purpose of the Study:

  • To investigate the miRNA expression patterns in renal cancer.
  • To elucidate the interplay between hypoxia, PTEN status, and miRNA dysregulation within the tumor microenvironment.
  • To identify potential miRNA-based therapeutic targets for renal cancer.

Main Methods:

  • Utilized CRISPR/Cas9 to create a PTEN knockout in the Renca kidney cancer cell line.
  • Performed global miRNA expression analysis in vitro (normoxic and hypoxic conditions) and in vivo.
  • Validated findings on human renal cancer models with varying PTEN status.

Main Results:

  • Hypoxia universally increased miR-210-3p expression.
  • Hypoxia-induced PTEN decrease correlated with increased miR-221-3p.
  • PTEN loss altered hypoxia-driven miRNA changes, decreasing miR-10b-5p and increasing miR-206-3p.
  • Complete PTEN loss induced miR-155-5p and miR-100-5p.
  • Upregulation of miR-342-3p was observed in PTEN-knockout tumors within the tumor microenvironment.

Conclusions:

  • MiRNA patterns in renal cancer are significantly influenced by both hypoxia and PTEN mutation status.
  • Effective cancer therapy strategies must consider the tumor microenvironment's specific characteristics and genetic alterations.
  • Specific miRNAs (e.g., miR-210-3p, miR-221-3p, miR-10b-5p, miR-206-3p, miR-155-5p, miR-100-5p, miR-342-3p) are potential biomarkers and therapeutic targets in renal cancer.
Keywords:
PTENRCCmicroRNAtumor hypoxia

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