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Genetically dystrophic mdx/mdx mice exhibit decreased response to nicotine in passive avoidance
Roberto Coccurello1, Claudio Castellano, Paola Paggi
1Dipartimento di Genetica e Biologia Molecolare, Italy.
Abstract:
mdx mice are considered as a genetic homologous of human Duchenne muscular dystrophy. Recent evidence demonstrates that in mouse sympathetic ganglion dystrophin is involved in the stabilization of nicotinic acetylcholine receptor clusters. The purpose of this study was to verify possible effects of dystrophin alterations at the central level. This was assessed by evaluating the response to nicotine administration in mdx and wild-type mice. Thus the effects of post-training nicotine administrations (0.1, 0.25 and 0.5 mg/kg) were tested in mice subjected to a passive avoidance memory task, that measures the ability of mice to remember on test day a shock received 24 h before. Nicotine enhanced memory in wild-type as well as in mdx mice. However, the doses needed to increase memory in mdx were higher than in wild-type. These results are discussed in terms of possible functional changes in central nicotinic acetylcholine receptor in mdx mice.
Insights
Duchenne muscular dystrophy model mice (mdx) show altered responses to nicotine, requiring higher doses to improve memory compared to wild-type. This suggests functional changes in central nicotinic acetylcholine receptors in mdx mice.
Area of Science:
- Neuroscience
- Genetics
- Pharmacology
Background:
- Mdx mice serve as a genetic model for human Duchenne muscular dystrophy.
- Dystrophin deficiency impacts nicotinic acetylcholine receptor cluster stability in peripheral nervous system.
- The role of dystrophin in central nervous system function remains less understood.
Purpose of the Study:
- To investigate the effects of dystrophin alterations on central nervous system function.
- To assess behavioral responses to nicotine administration in mdx mice compared to wild-type controls.
- To explore potential changes in central nicotinic acetylcholine receptor function in the context of muscular dystrophy.
Main Methods:
- Utilized mdx mice and wild-type littermates for behavioral experiments.
- Administered varying doses of nicotine (0.1, 0.25, 0.5 mg/kg) post-training.
- Assessed memory performance using a passive avoidance task, measuring shock retention over 24 hours.
Main Results:
- Nicotine administration successfully enhanced memory performance in both wild-type and mdx mice.
- Mdx mice required significantly higher doses of nicotine to achieve memory enhancement compared to wild-type mice.
- This indicates a potential desensitization or altered sensitivity of central nicotinic acetylcholine receptors in mdx mice.
Conclusions:
- Dystrophin deficiency in mdx mice is associated with altered central nicotinic acetylcholine receptor function.
- These findings suggest a potential therapeutic target for cognitive deficits in muscular dystrophy models.
- Further research is warranted to elucidate the precise mechanisms underlying these central nervous system changes.