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D2 dopamine receptor localization on striatonigral neurons.

M A Ariano1, C J Stromski, E M Smyk-Randall

  • 1Neuroscience Institute, Chicago Medical School, IL 60064.

Neuroscience Letters
|September 14, 1992
PubMed
Summary

This study reveals the distribution of D2 dopamine receptors in the brain. D2 receptors are found on many neurons in the neostriatum, impacting treatments for neurological disorders.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Two main classes of dopamine receptors, D1 and D2, are crucial in the central nervous system.
  • Dopamine receptors are key targets for treating Parkinson's disease and schizophrenia.
  • Understanding dopamine receptor cellular distribution is vital for therapeutic advancements.

Purpose of the Study:

  • To investigate the postsynaptic distribution of D2 dopamine receptors within the neostriatum.
  • To clarify the cellular localization of D2 dopamine receptors in the basal ganglia.

Main Methods:

  • Utilized retrograde labeling techniques.
  • Employed immunofluorescence to detect specific receptor amino acid sequences.
  • Examined the postsynaptic distribution of striatal D2 dopamine receptors.

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Main Results:

  • D2 dopamine receptors were identified on at least 60% of neurons projecting from the neostriatum to the substantia nigra.
  • Approximately 65% of all D2 receptor-positive cells were found to be intrinsic neurons within the neostriatum.

Conclusions:

  • The D2 dopamine receptor exhibits a widespread distribution in the neostriatum, present on both projection and intrinsic neurons.
  • Findings provide critical insights into the cellular neuroanatomy of dopamine signaling.
  • This detailed mapping aids in understanding the neural circuitry underlying dopamine-related disorders.