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Related Experiment Video

Updated: May 29, 2026

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Met receptor: a moving target.

Michael J Clague1

  • 1Physiological Laboratory, Institute of Translational Medicine, University of Liverpool, Crown Street, L69 3BX, Liverpool, UK. clague@liv.ac.uk

Science Signaling
|September 16, 2011
PubMed
Summary
This summary is machine-generated.

Mutant hepatocyte growth factor (HGF) receptors bypass degradation, recycling to the cell surface for enhanced signaling. This pathway impacts cell motility and tumorigenesis, revealing a new mechanism for receptor regulation.

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Area of Science:

  • Cell biology
  • Molecular signaling
  • Cancer research

Background:

  • Activated hepatocyte growth factor (HGF) receptor (Met) is typically degraded in lysosomes.
  • This down-regulation is crucial for controlling cellular signaling.

Purpose of the Study:

  • To investigate how certain Met receptor mutations alter its degradation pathway.
  • To explore the role of endosomal recycling in Met receptor signaling and cellular functions.

Main Methods:

  • Analysis of Met receptor trafficking in response to HGF activation.
  • Investigating the involvement of adaptor proteins (e.g., GGA3) and small GTPases (e.g., Arf6) in receptor recycling.
  • Studying the signaling output from endosomes.

Main Results:

  • Kinase-activating Met receptor mutations lead to plasma membrane recycling instead of lysosomal degradation.
  • Recycled Met receptors can signal from endosomes, promoting cell motility and tumorigenesis.
  • Wild-type Met receptors also utilize endosomal recycling, dependent on GGA3, Arf6, and Crk interactions.

Conclusions:

  • Endosomal recycling provides an alternative pathway for Met receptor regulation, circumventing lysosomal degradation.
  • Spatial control of Met receptor signaling via endosomal recycling is critical for cell motility and potentially tumorigenesis.
  • This pathway represents a novel mechanism influencing receptor dynamics and cellular behavior.