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Related Experiment Videos

Early changes in degenerating mouse sciatic nerve are associated with endothelial cells.

A L Oaklander1, M S Miller, P S Spencer

  • 1Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY 10461.

Brain Research
|September 1, 1987
PubMed
Summary

The earliest biochemical sign of nerve Wallerian degeneration is DNA synthesis, specifically [3H]thymidine incorporation, beginning one day after nerve injury in mice. This early response primarily involves endothelial cells.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Biochemistry

Background:

  • Wallerian degeneration is a critical process following nerve injury, but the earliest biochemical events remain incompletely understood.
  • Identifying specific molecular markers is crucial for understanding nerve regeneration and developing therapeutic strategies.

Purpose of the Study:

  • To determine the earliest reproducible biochemical change in nerves undergoing Wallerian degeneration.
  • To assess the timing, magnitude, and specificity of cellular function markers in distal nerve stumps.

Main Methods:

  • Mouse sciatic nerves were transected, and sham operations were performed.
  • Temporal changes in DNA, RNA, and protein synthesis, and ornithine decarboxylase activity were analyzed from 0-5 days postoperatively.

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  • Incorporation of [3H]thymidine was used as a marker of premitotic activity.

    • Main Results:

    • The earliest and most specific marker of Wallerian degeneration was [3H]thymidine incorporation, indicating premitotic activity.
    • This response began as early as 1 day post-transection, with a peak at 3-4 days.
    • Preferential labeling of endothelial cells lining intrafascicular capillaries was observed during the early [3H]thymidine response.

    Conclusions:

    • Early Wallerian degeneration is characterized by a specific increase in DNA synthesis, primarily in endothelial cells.
    • This study identifies [3H]thymidine incorporation as a key early biochemical marker for studying nerve degeneration.