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Related Experiment Videos

The dopaminergic amacrine cell.

D M Dacey1

  • 1Department of Biological Structure, University of Washington, Seattle 98195.

The Journal of Comparative Neurology
|November 15, 1990
PubMed
Summary

This study details the morphology of dopaminergic amacrine cells in macaque retinas using HRP injections. These cells exhibit extensive, varicose axon-like processes, crucial for retinal function.

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Area of Science:

  • Neuroscience
  • Retinal Cell Biology
  • Primate Visual System

Background:

  • Dopaminergic amacrine cells play a key role in retinal processing.
  • Previous characterization of these cells in primates has been limited.

Purpose of the Study:

  • To provide a detailed morphological characterization of dopaminergic amacrine cells in the macaque retina.
  • To compare the morphology of HRP-filled cells with tyrosine hydroxylase (TH)-immunoreactive cells.

Main Methods:

  • Intracellular injection of horseradish peroxidase (HRP) into macaque retinal wholemounts.
  • Staining with acridine orange and Lucifer Yellow.
  • Tyrosine hydroxylase (TH) immunohistochemistry using diaminobenzidine (DAB).

Main Results:

  • HRP-fills revealed large amacrine cells with spiny dendritic trees and extensive, varicose, axon-like processes extending over 3 mm.
  • These HRP-filled cells corresponded to TH-immunoreactive amacrine cells.
  • Axon-like processes showed a high coverage factor (≥300), suggesting a total length of 4-5 mm, forming a dense plexus.

Conclusions:

  • Dopaminergic amacrine cells in the macaque retina possess extensive axonal arborizations.
  • The high coverage factor of the axon-like processes suggests a significant role in modulating retinal circuitry.
  • Morphological and immunohistochemical data confirm the identity of these cells as dopaminergic amacrine neurons.

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