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Galectin-1 in regenerating motoneurons
J McGraw1, L T McPhail, L W Oschipok
1International Collaboration On Repair Discoveries, 6270 University Boulevard, University of British Columbia, Vancouver, Canada, V6T 1Z4.
The European Journal of Neuroscience
|December 8, 2004
Summary
Galectin-1 (gal-1) expression increases in facial motoneurons after nerve injury. This protein aids peripheral nerve regeneration and functional recovery in mice.
Area of Science:
- Neuroscience
- Regenerative Medicine
- Molecular Biology
Background:
- Recombinant galectin-1 (gal-1) administration enhances peripheral nerve regeneration.
- Endogenous galectin-1 expression rises in neurons post-axotomy.
Purpose of the Study:
- To investigate the regulation of endogenous galectin-1 mRNA expression in facial motoneurons following nerve injury.
- To determine the role of galectin-1 in functional recovery after facial nerve injury.
Main Methods:
- Quantification of galectin-1 mRNA in mouse facial motoneurons after nerve resection or crush injury.
- Assessment of galectin-1 expression changes following target re-innervation and axonal transport blockade (colchicine).
- Evaluation of galectin-1 mRNA levels after glial-derived neurotrophic factor (GDNF) injection.
- Functional recovery assessment in galectin-1 null mutant mice after facial nerve crush.
Main Results:
- Nerve injury significantly increased galectin-1 mRNA in facial motoneurons.
- Loss of target-derived factors and axonal transport blockade contributed to increased galectin-1 expression.
- GDNF administration also elevated galectin-1 mRNA levels.
- Galectin-1 null mutant mice exhibited delayed functional recovery of whisking movements.
Conclusions:
- Endogenous galectin-1 expression in facial motoneurons is upregulated post-injury, influenced by target-derived signals and potentially positive factors like GDNF.
- Galectin-1 plays a crucial role in promoting functional recovery following peripheral nerve damage.