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Cholinergic synaptic circuitry in the macaque prefrontal cortex

L Mrzljak1, M Pappy, C Leranth

  • 1Section of Neurobiology, Yale University School of Medicine, New Haven, Connecticut 06510, USA.

The Journal of Comparative Neurology
|July 10, 1995
PubMed
Summary
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Cholinergic axons in primate brains form synapses on dendrites and cell bodies, with some potentially having dual modulatory effects. This research clarifies the synaptic architecture of acetylcholine in the cortex.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Primate Brain Research

Background:

  • Limited understanding of cholinergic innervation's synaptic structure in the primate cerebral cortex.
  • Cholinergic system's known relevance to cognitive functions and Alzheimer's disease.

Purpose of the Study:

  • To investigate the synaptic architecture of cholinergic axons in the macaque prefrontal cortex.
  • To elucidate the targets and synaptic patterns of cholinergic innervation.

Main Methods:

  • Serial section electron microscopy of macaque prefrontal cortex.
  • Immunohistochemistry using an antibody against choline acetyltransferase (ChAT).
  • Visualization via immunoperoxidase and silver-enhanced diaminobenzidine sulfide (SEDS) techniques.

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Main Results:

  • Cholinergic axons synapse in all cortical layers exclusively using symmetric junctions.
  • Synapses primarily target dendritic shafts (70.5%), spines (25%), and cell bodies (4.5%).
  • Identified cholinergic boutons apposed to spines/dendrites without visible synapses, near asymmetric synapses, suggesting a dual modulatory role.

Conclusions:

  • Cholinergic axons innervate both pyramidal and GABAergic neurons in the prefrontal cortex.
  • Findings suggest acetylcholine may exert dual modulatory effects via synaptic and non-synaptic mechanisms.
  • Further physiological studies are needed to confirm non-synaptic acetylcholine release in the cortex.