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Updated: Feb 25, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

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Two-Pulse Endosomal Stimulation of Receptor Tyrosine Kinases Induces Cell Proliferation

Steven Pennock1,2, Sukhmani Billing3, Zhixiang Wang1

  • 1Signal Transduction Research Group, Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada, T6G 2H7.

Methods in Molecular Biology (Clifton, N.J.)
|August 10, 2017
PubMed

Insights

This study reveals that receptor tyrosine kinases (RTKs) remain active after endocytosis. A novel two-pulse stimulation method activates endosomal EGFR, driving cell proliferation.

Area of Science:

  • Cellular signaling and cancer biology
  • Molecular mechanisms of receptor tyrosine kinases (RTKs)

Background:

  • Receptor tyrosine kinases (RTKs) are crucial for cell signaling, regulating processes like proliferation.
  • Dysregulated RTK activity is linked to diseases, notably cancer.
  • RTKs are activated at the plasma membrane but remain active during endosomal trafficking.

Purpose of the Study:

  • To investigate the biological outcomes of sustained RTK activity during endosomal trafficking.
  • To develop a method for controlling RTK activity within endosomes.
  • To explore the potential of targeted endosomal RTK activation for driving cell proliferation.

Main Methods:

  • Development of a two-pulse endosomal stimulation approach.
  • Focus on epidermal growth factor receptor (EGFR) as a model RTK.
  • Assessing the impact of endosomal EGFR activation on cell proliferation.

Main Results:

  • Demonstrated that endosome-accumulated RTKs can be specifically activated.
  • The two-pulse stimulation method successfully activated endosomal EGFR.
  • Activated endosomal EGFR was shown to drive cell proliferation.

Conclusions:

  • RTK activity persists beyond initial plasma membrane activation and continues within endosomes.
  • Targeted activation of endosomal RTKs is a viable strategy for modulating cellular processes.
  • This approach offers new insights into RTK signaling and potential therapeutic avenues for diseases involving cell proliferation.
Keywords:
Cell proliferationEndosomeEpidermal growth factor receptor (EGFR)Receptor tyrosine kinase (RTK)Two pulse

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