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Evidence for CGRP accumulation and activity in experimental neuromas
D W Zochodne1, J A Allison, W Ho
1Department of Clinical Neurosciences, University of Calgary, Alberta, Canada.
The American Journal of Physiology
|February 1, 1995
Summary
Calcitonin gene-related peptide (CGRP) causes increased blood flow in experimental nerve injuries. This neuropeptide accumulates in neuromas and may play a role in nerve regeneration.
Area of Science:
- Neuroscience
- Neuropeptide Research
- Peripheral Nerve Injury
Background:
- Calcitonin gene-related peptide (CGRP) is a vasodilator neuropeptide.
- CGRP may influence peripheral nerve injury response.
Purpose of the Study:
- To investigate CGRP presence and activity in experimental rat neuromas.
- To assess CGRP's role in nerve injury-induced hyperemia.
Main Methods:
- Created experimental neuromas in Sprague-Dawley rats by sciatic nerve section.
- Measured local blood flow using hydrogen polarography and laser-Doppler flowmetry.
- Evaluated CGRP presence via immunohistochemistry and radioimmunoassay (RIA).
Main Results:
- Increased local blood flow observed in neuromas at 24h, 48h, 7d, and 14d post-injury.
- Peak hyperemia occurred at 48h and was reversed by a CGRP antagonist.
- CGRP immunoreactivity and content increased, correlating with blood flow changes.
Conclusions:
- CGRP accumulates in experimental neuromas over time.
- CGRP induces significant local vasodilatation in injured peripheral nerves.
- CGRP is likely important in the regenerative process of injured nerves.