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Related Experiment Videos

Enigmatic bipolar cell of rat visual cortex.

A Peters1, K M Harriman

  • 1Department of Anatomy, Boston University School of Medicine, Massachusetts 02118.

The Journal of Comparative Neurology
|January 15, 1988
PubMed
Summary

Two distinct populations of bipolar cells exist in the rat visual cortex, differing in their synaptic connections. One type forms asymmetric synapses, primarily with dendritic spines, while the other forms symmetric synapses, mainly with dendritic shafts, including VIP-positive cells.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Visual System Research

Background:

  • Bipolar cells in the rat visual cortex were previously reported to form either asymmetric or symmetric synapses.
  • This created an enigma, especially when antibodies to vasoactive intestinal polypeptide (VIP) and choline acetyltransferase (ChAT) preferentially labeled bipolar cells forming symmetric synapses.

Purpose of the Study:

  • To resolve the conflicting observations regarding bipolar cell synaptic connections in the rat visual cortex.
  • To investigate the characteristics and synaptic targets of different bipolar cell populations, particularly those labeled by VIP.

Main Methods:

  • Golgi-electron microscopy was used to examine the synaptic connections of bipolar cells.
  • Immunohistochemistry with antibodies against VIP and choline acetyltransferase (ChAT) was employed to identify specific bipolar cell populations.

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Main Results:

  • Two distinct populations of bipolar cells were identified: one forming asymmetric synapses (67% with dendritic spines) and another forming symmetric synapses (100% with dendritic shafts).
  • VIP-labeled bipolar cells were found to form symmetric synapses, targeting dendritic shafts, cell bodies of pyramidal and nonpyramidal cells, and even other bipolar cells.
  • Approximately 50% of bipolar cells in the rat visual cortex are VIP-positive, and some possess myelinated axons.

Conclusions:

  • The study resolves the enigma by demonstrating two distinct populations of bipolar cells in the rat visual cortex based on their synaptic morphology.
  • VIP-positive bipolar cells constitute a significant subpopulation forming symmetric synapses and exhibiting diverse postsynaptic targets.
  • It is suggested that most VIP-positive bipolar cells may also contain GABA, warranting further investigation.