Receptor tyrosine kinase transactivation: fine-tuning synaptic transmission

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Updated: Sep 27, 2026

Microtransplantation of Synaptic Membranes to Reactivate Human Synaptic Receptors for Functional Studies
10:08

Microtransplantation of Synaptic Membranes to Reactivate Human Synaptic Receptors for Functional Studies

Published on: July 20, 2022

Stephen S G Ferguson1

  • 1Cell Biology Research Group, Robarts Research Institute, Department of Physiology and Pharmacology, University of Western Ontario, 100 Perth Drive, PO Box 5015, London, Ontario, Canada N6A 5K8. ferguson@robarts.ca

Trends in Neurosciences
|February 20, 2003
PubMed

Insights

Dopamine D4 receptors transactivate growth factor receptors, impacting brain signaling. This finding offers new insights into dopamine

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • G-protein-coupled receptors (GPCRs) signal via receptor tyrosine kinases (RTKs) and MAPK pathways.
  • RTK activation involves autophosphorylation and endocytosis.

Purpose of the Study:

  • To investigate dopamine D4 receptor-mediated transactivation of platelet-derived growth factor beta receptor (PDGFβR).
  • To determine the impact of this transactivation on synaptic neurotransmission and NMDA receptor function.
  • To explore the implications for cognitive disorders.

Main Methods:

  • Investigated GPCR-RTK transactivation mechanisms.
  • Utilized neurophysiological assays to measure synaptic activity.
  • Examined calcium-dependent NMDA receptor inactivation.

Main Results:

  • Dopamine D4 receptor stimulation transactivates PDGFβR.
  • This transactivation leads to rapid modulation of synaptic neurotransmission.
  • Ca(2+)-dependent inactivation of NMDA receptors was observed.

Conclusions:

  • RTK transactivation plays a physiological role in the central nervous system (CNS).
  • Aberrant dopamine signaling may underlie cognitive deficits in schizophrenia and ADHD.
  • Provides a novel mechanism for understanding dopamine's role in brain function.

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