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Vinca alkaloid drugs promote stress-induced translational repression and stress granule formation

Witold Szaflarski1,2,3, Marta M Fay1,2, Nancy Kedersha1,2

  • 1Division of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital, Boston, MA, USA.

Oncotarget
|April 16, 2016
PubMed

Insights

Vinca alkaloids activate stress granules (SGs), aiding cancer cell survival by altering RNA metabolism. Blocking SG assembly enhances chemotherapy effectiveness and promotes cancer cell death.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cellular Stress Response

Background:

  • Chemotherapy drug resistance is a major clinical challenge.
  • Stress granules (SGs) are cellular complexes involved in stress response and cancer cell survival.
  • The precise role of SGs in mediating chemotherapy resistance is not fully understood.

Purpose of the Study:

  • To investigate the role of stress granules in the mechanism of action of vinca alkaloids (VAs).
  • To explore how VAs affect cellular RNA metabolism and SG formation.
  • To determine if targeting SG assembly can overcome VA resistance.

Main Methods:

  • Analysis of SG assembly and composition in cancer cells treated with VAs.
  • Investigated the role of translation initiation factors eIF4E-BP1 and eIF2α.
  • Assessed the impact of inhibiting SG assembly on cancer cell viability and apoptosis.

Main Results:

  • Vinca alkaloids potently induce stress granule formation in cancer cells.
  • VA-induced SGs are formed through the activation of eIF4E-BP1 and phosphorylation of eIF2α, inhibiting translation.
  • Inhibition of SG assembly significantly reduced cancer cell viability and increased apoptosis.

Conclusions:

  • Vinca alkaloids activate a stress granule-mediated survival pathway in cancer cells.
  • Targeting the assembly of stress granules represents a potential strategy to enhance chemotherapy efficacy.
  • This study reveals novel insights into the effects of VAs on RNA metabolism and cancer cell survival.
Keywords:
cancerchemotherapystress granulesstress responsetranslation initiation

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