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The complement factor C5a receptor is upregulated in NFL-/- mouse motor neurons
Saima Humayun1, May Gohar, Kathryn Volkening
1Department of Pathology, Schulich School of Medicine, University of Western Ontario, London, Canada.
Journal of Neuroimmunology
|March 17, 2009
Summary
Degenerating motor neurons in ALS models show increased C5aR expression. This suggests C5aR may contribute to motor neuron damage and excitotoxicity in Amyotrophic Lateral Sclerosis.
Area of Science:
- Neuroscience
- Immunology
- Neurodegeneration
Background:
- Amyotrophic Lateral Sclerosis (ALS) involves motor neuron degeneration.
- The complement system, including C5a, plays a role in neuroinflammation.
- C5a anaphylatoxin receptor (C5aR) is implicated in inflammatory responses.
Purpose of the Study:
- To investigate the role of C5aR in motor neuron degeneration in ALS.
- To determine if C5aR expression is altered in ALS motor neurons.
- To explore the relationship between C5a, C5aR, and excitotoxicity in ALS.
Main Methods:
- Utilized NFL-/- mice, a model for motor neuron degeneration in ALS.
- Assessed C5aR expression in spinal motor neurons during disease progression.
- Examined the effects of C5a and kainate on C5aR expression in neuronal cells.
Main Results:
- Degenerating motor neurons in NFL-/- mice exhibited high C5aR levels early in the disease.
- C5a demonstrated potent neurotoxic effects on Neuro2A and PC12 cells in vitro.
- Both C5a and kainate increased activated C5aR expression, while glutamate did not interact with C5a.
Conclusions:
- Early upregulation of C5aR in motor neurons may contribute to ALS pathogenesis.
- C5aR activation could exacerbate motor neuron damage and potentiate excitotoxicity in ALS.
- Targeting C5aR may offer a therapeutic strategy for ALS.
