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Ras transformation uncouples the kinesin-coordinated cellular nutrient response.

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Kinesin family members KIF2A and KIF2C regulate lysosome organization and mTORC1 activity. Mutant K-Ras repurposes these proteins for cancer growth, independent of ERK1/2 signaling.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Kinesins are motor proteins, but KIF2A and KIF2C depolymerize microtubules.
  • KIF2A influences lysosome localization and mTORC1 activation.
  • ERK1/2 signaling regulates KIF2C and KIF2A expression.

Purpose of the Study:

  • To investigate the role of KIF2C and KIF2A in lysosome organization and mTORC1 activity.
  • To determine how ERK1/2 signaling impacts these processes in normal and cancer cells.
  • To understand how mutant K-Ras utilizes these pathways in cancer.

Main Methods:

  • Studied immortalized human bronchial epithelial cells (HBECs) and mutant K-Ras-transformed cells.
  • Utilized ERK1/2 inhibition with PD0325901.
  • Assessed lysosome organization, mTORC1 activity, proliferation, and migration.

Main Results:

  • ERK1/2 inhibition disrupted lysosome organization and decreased mTORC1 activity in HBECs, mimicking nutrient deprivation.
  • In Ras-transformed cells, mTORC1 activity and lysosome organization were independent of ERK1/2 and KIFs.
  • ERK1/2 and KIFs were essential for Ras-dependent proliferation and migration.

Conclusions:

  • Mutant K-Ras repurposes KIF2A, KIF2C, and ERK1/2 signaling for cancer phenotypes.
  • These proteins play distinct roles in normal cells versus Ras-transformed cancer cells.