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Related Experiment Videos

Cell-type specific dendritic contacts between retinal ganglion cells during development.

C Lohmann1, R O Wong

  • 1Department of Anatomy and Neurobiology, Washington University Medical School, Box 8108, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA.

Journal of Neurobiology
|July 5, 2001
PubMed
Summary

Developing retinal ganglion cells (RGCs) form specific dendro-dendritic contacts. These contacts between same-sign RGCs, but not opposite-sign RGCs, may regulate mosaic formation and dendritic field overlap during development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Retinal Cell Biology

Background:

  • Retinal ganglion cells (RGCs) process visual information within defined dendritic fields.
  • ON and OFF center RGCs form separate retinal mosaics with consistent overlap.
  • Lateral inhibition is hypothesized to regulate RGC dendritic field development.

Purpose of the Study:

  • To investigate the presence and nature of dendro-dendritic contacts between developing RGCs.
  • To determine if these contacts play a role in the formation of ON and OFF RGC mosaics.
  • To explore the cell-type specificity and developmental timing of these contacts.

Main Methods:

  • Multiphoton microscopy was used to reconstruct dye-filled, neighboring ON and OFF ferret alpha RGCs.
  • Dendro-dendritic contacts were analyzed across different neonatal ages.

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  • Cell-type specificity of contacts was assessed by examining interactions between alpha and beta RGCs.

    • Main Results:

    • Dendro-dendritic contacts were observed exclusively between RGCs of the same sign (ON/ON or OFF/OFF), never between opposite signs (ON/OFF).
    • Contacts occurred between terminal dendrites and also involved fasciculation of dendritic processes.
    • Contacts were present before full stratification of alpha cell arbors, indicating early cell recognition.
    • Contacts were cell-type specific, with alpha cells not contacting beta cells of the same sign.

    Conclusions:

    • Dendro-dendritic contacts between developing RGCs are cell-type specific and occur early in development.
    • These contacts likely mediate intercellular signaling crucial for regulating dendritic field extension.
    • Such signaling maintains constant relative overlap within ON and OFF RGC mosaics during development.