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Axonal reinnervation does not influence Schwann cell proliferation after rat sciatic nerve transection
J Siironen1, Y Collan, M Röyttä
1Department of Pathology, University of Turku, Finland.
Brain Research
|August 22, 1994
Summary
Reinnervating axons do not significantly increase Schwann cell proliferation in the distal nerve stump in vivo. Nerve transection effects, not axonal regrowth, appear to drive Schwann cell changes.
Area of Science:
- Neuroscience
- Cell Biology
- Regenerative Medicine
Background:
- Schwann cells are crucial for peripheral nerve repair.
- In vitro studies suggest axons stimulate Schwann cell proliferation.
- The in vivo role of reinnervating axons in Schwann cell mitogenesis remains unclear.
Purpose of the Study:
- To investigate whether reinnervating axons act as Schwann cell mitogens in vivo.
- To compare Schwann cell proliferation in transected nerves with and without axonal reinnervation.
Main Methods:
- Sciatic nerve transection in Wistar rats, with and without preventing reinnervation.
- PCNA-immunostaining to assess cell proliferation.
- Bielschowsky and S-100 staining to track axons and Schwann cells.
Main Results:
- Schwann cell proliferation in the distal stump was similar regardless of axonal reinnervation.
- No significant proliferation of non-Schwann cells was observed.
- Proximally, axonal sprouts and Schwann cell numbers increased when nerve stumps were sutured.
Conclusions:
- Axonal reinnervation into the distal stump does not significantly enhance Schwann cell proliferation in vivo.
- Nerve transection itself may induce changes in Schwann cell numbers.
- Axons might be mitogenic, but this effect is masked by other factors in vivo.