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Related Experiment Videos

Agonist-induced morphologic decrease in cellular D1A dopamine receptor staining

M A Ariano1, C E Sortwell, M Ray

  • 1Department of Neuroscience, Chicago Medical School, Illinois, USA. arianom@mis.finchcms.edu

Synapse (New York, N.Y.)
|February 12, 1998
PubMed
Summary
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Acute dopamine (DA) exposure causes D1A receptor protein loss from cell surfaces, likely via endocytosis. This desensitization is reversible and functionally distinct from cyclic AMP signaling changes.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Dopamine (DA) receptors play crucial roles in brain function.
  • Understanding dopamine receptor desensitization is key to neurological research.

Purpose of the Study:

  • To investigate the distribution changes of D1A dopamine receptor proteins following acute DA exposure.
  • To elucidate the mechanisms underlying D1A dopamine receptor desensitization.

Main Methods:

  • Immunofluorescent staining of D1A DA receptor protein in CHO cells, primary striatal cultures, and rat striatal slices.
  • Assessment of cyclic AMP levels as a functional readout.
  • Use of specific antagonists ((+)-butaclamol, SCH 23390) and concanavalin A.
  • FM1-43 fluorescence to track endocytosis.

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Main Results:

  • Acute DA exposure led to a significant loss of D1A receptor protein staining on cell surfaces.
  • This effect was observed across all tested models (CHO cells, cell cultures, brain slices).
  • The DA-induced changes were blocked by D1-family antagonists and reversed upon agonist removal.
  • Cyclic AMP levels increased, indicating functional receptor integrity, and this was also blocked by antagonists.
  • Concanavalin A blocked receptor loss but not cAMP elevation, suggesting distinct mechanisms.
  • FM1-43 uptake indicated endocytosis of D1A receptors.

Conclusions:

  • Acute homologous D1A DA receptor desensitization involves the translocation of receptors from the cell surface to an intracellular compartment.
  • Endocytosis is a likely mechanism mediating this rapid receptor redistribution.
  • The observed receptor loss is morphologically distinct from the functional signaling response (cAMP increase).