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Related Experiment Videos

Signaling on the endocytic pathway.

P S McPherson1, B K Kay, N K Hussain

  • 1Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, H3A 2B4, Canada. mcpm@musica.mcgill.ca

Traffic (Copenhagen, Denmark)
|June 8, 2001
PubMed
Summary
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Receptor endocytosis, traditionally seen as a signal terminator, actually facilitates continued signaling. Endocytic vesicles act as distinct signaling compartments, crucial for propagating cellular responses.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Signal Transduction

Background:

  • Receptor tyrosine kinases (RTKs) and G-protein-coupled receptors (GPCRs) initiate signaling upon ligand binding.
  • Receptor endocytosis via clathrin-coated pits was thought to attenuate signaling.
  • Emerging evidence suggests signaling persists during and after endocytosis.

Purpose of the Study:

  • To investigate the role of endocytosis in signal transduction.
  • To determine if endocytic vesicles serve as signaling platforms.

Main Methods:

  • Studied ligand binding to RTKs and GPCRs.
  • Investigated receptor trafficking through clathrin-coated pits.
  • Analyzed signaling events during endocytosis, including extracellular signal-regulated kinase (ERK) activation.

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Main Results:

  • Endocytosis does not solely attenuate signaling; it can propagate it.
  • Signaling components assemble at clathrin-coated pits and associate with endocytic vesicles.
  • Extracellular signal-regulated kinase (ERK) activation appears to require endocytosis.
  • Endocytic vesicles function as signaling compartments separate from the plasma membrane.

Conclusions:

  • Endocytosis is integral to the activation and propagation of signaling pathways.
  • Endocytic vesicles are dynamic signaling platforms.
  • Receptor-mediated endocytosis plays a dual role in signal regulation.