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Extracellular proteases in developing chick neural retina.

J B Sheffield1, D Graff

  • 1Department of Biology, Temple University, Philadelphia, PA 19122.

Experimental Eye Research
|June 1, 1991
PubMed
Summary
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Embryonic neural retinal cells secrete metalloproteinases that degrade extracellular matrix, facilitating cell migration during retinal development. This proteolytic activity is crucial for tissue remodeling and neurite extension.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Cell migration is essential for retinal histogenesis.
  • Space must be created within the tissue matrix for cell movement.

Purpose of the Study:

  • To investigate the role of extracellular proteolytic activity in embryonic neural retinal cell migration.
  • To identify the types of proteases involved in this process.

Main Methods:

  • Culturing embryonic chick neural retinal cells on fluorescent gelatin substrates.
  • Performing soluble assays on neural retinal homogenates.
  • Utilizing zymogram analysis to detect proteolytic activity.
  • Testing the effect of 1.10 phenanthroline and plasminogen on protease activity.

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Main Results:

  • Neurite tips degraded the fluorescent gelatin substrate, indicating gelatinolysis.
  • Latent gelatinolytic activity was detected in neural retinal homogenates.
  • Zymograms revealed high molecular weight proteolytic bands, inhibited by 1.10 phenanthroline, suggesting metalloproteinase involvement.
  • Proteolytic activity was found in cell culture supernatants.
  • Plasminogen addition revealed additional proteolytic activity, indicating a plasminogen activation system.

Conclusions:

  • Extracellular metalloproteinase activity is associated with embryonic neural retinal cell migration.
  • Proteolytic degradation of the extracellular matrix facilitates cell movement and neurite extension during retinal development.
  • The retina exhibits complex proteolytic systems, including metalloproteinases and a plasminogen activation system.