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Metformin-Derived Growth Inhibition in Renal Cell Carcinoma Depends on miR-21-Mediated PTEN Expression

Charis Kalogirou1, Daniel Schäfer, Markus Krebs

  • 1Department of Urology and Paediatric Urology, Julius Maximilians University Medical Centre of Wx00FC;rzburg, Wx00FC;rzburg, Germany.

Urologia Internationalis
|October 27, 2015
PubMed
Abstract

Insights

Metformin

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Metformin exhibits tumor-suppressive properties in renal cell carcinoma (RCC) by activating AMPK, which inhibits the AKT/mTOR pathway.
  • MicroRNA-21 (miR-21) and its target gene PTEN play crucial roles in cancer development and progression.
  • Understanding the interplay between metformin, miR-21, and PTEN is essential for optimizing RCC treatment strategies.

Purpose of the Study:

  • To investigate the role of miR-21 and PTEN in mediating metformin's (MF) anti-cancer effects in renal cell carcinoma (RCC) cell lines.
  • To explore the impact of miR-21 and PTEN on metformin sensitivity in CAKI-1 and CAKI-2 cells.
  • To elucidate the molecular mechanisms underlying metformin's action in RCC, focusing on the miR-21/PTEN/AKT signaling axis.

Main Methods:

  • Cell proliferation was assessed using MTS assays.
  • Quantitative real-time PCR (qRT-PCR) was employed to analyze miR-21 and PTEN expression levels.
  • Cells were transfected with pre-miR-21 or anti-miR-21 mimics/inhibitors, and with siAMPK to assess AMPK dependency.
  • Western blot analysis was performed to evaluate the expression of PTEN, AKT, and phosphorylated AKT (pAKT).

Main Results:

  • CAKI-1 cells, less sensitive to metformin, displayed higher miR-21 and lower PTEN expression compared to CAKI-2 cells.
  • A negative correlation between miR-21 and PTEN expression was observed in both cell lines and a primary RCC cohort.
  • Metformin treatment reduced miR-21 levels and increased PTEN expression in an AMPK-dependent manner.
  • Modulating miR-21 levels affected metformin sensitivity, and metformin treatment influenced PTEN and pAKT levels.

Conclusions:

  • Differential sensitivity to metformin in RCC cells is linked to miR-21/PTEN expression levels, impacting AKT signaling.
  • The miR-21/PTEN axis is a key mediator of metformin's tumor-suppressive effects in RCC.
  • These findings suggest potential clinical implications for metformin-based therapies in RCC patients, possibly involving modulation of miR-21/PTEN.

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