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Targeted elimination of senescent Ras-transformed cells by suppression of MEK/ERK pathway

Elena Y Kochetkova1, Galina I Blinova1, Olga A Bystrova1

  • 1Institute of Cytology, Russian Academy of Sciences, St-Petersburg, Russia.

Aging
|November 16, 2017
PubMed

Insights

Cellular senescence prevents autophagy, enhancing MEK/ERK inhibitor efficacy against Ras-driven cancers. This approach targets Ras-expressing tumor cells by inducing apoptotic death.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • The Ras-Raf-MEK-ERK pathway is crucial in cancer development and a target for therapy.
  • Autophagy can promote cancer cell survival and drug resistance by counteracting anti-cancer treatments.

Purpose of the Study:

  • To investigate if inducing cellular senescence enhances the tumor-suppressive effects of MEK/ERK inhibition in Ras-mutated cancer cells.
  • To explore the mechanisms behind drug resistance and potential therapeutic strategies.

Main Methods:

  • Used HDAC inhibitor sodium butyrate to induce senescence in Ras-transformed rat embryo fibroblasts (ERas) and A549 lung adenocarcinoma cells.
  • Treated cells with MEK/ERK inhibitor PD0325901 and analyzed cell death, autophagy, and organelle function.
  • Examined lysosome-autophagosome spatial relationships in senescent cells.

Main Results:

  • MEK/ERK inhibition induced apoptosis in non-senescent ERas cells, but this was rescued by autophagy.
  • Senescent ERas cells failed to activate autophagy in response to MEK/ERK inhibition due to lysosome-autophagosome dissociation.
  • This impairment in senescent cells led to accumulated mitochondrial damage and apoptotic death.

Conclusions:

  • Cellular senescence blocks cytoprotective autophagy, making Ras-expressing cells vulnerable to MEK/ERK inhibition.
  • Targeting MEK/ERK in senescent Ras-driven cancer cells presents a novel strategy for tumor elimination.
  • This study highlights the potential of combining senescence induction with targeted pathway inhibition for cancer therapy.
Keywords:
MEK/ERKapoptosisautophagymitochondriasenescence

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