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Updated: Aug 22, 2026
Assessing Functional Performance in the Mdx Mouse Model
Published on: March 27, 2014
Impaired long-term spatial and recognition memory and enhanced CA1 hippocampal LTP in the dystrophin-deficient
Cyrille Vaillend1, Jean-Marie Billard, Serge Laroche
1Laboratoire de Neurobiologie de la Mémoire, de l'Apprentissage et de la Communication, CNRS UMR 8620, Université Paris-Sud, 91405 Orsay, France. cyrille.vaillend@ibaic.u-psud.fr
Abstract:
Duchenne muscular dystrophy (DMD) is associated with cognitive deficits that may result from dystrophin deficiency in neurons. However, in the dystrophin-deficient Dmd(mdx) mouse model of DMD, the nature of the memory impairment is not well characterised and its biological substrate is uncertain. Here, we demonstrate that dystrophin deficiency in Dmd(mdx) mice impairs long-term, but not short-term, object recognition memory and impairs long-term spatial memory, but not acquisition, following massed training in the water maze. Furthermore, we show that the abnormal enhancement of CA1 hippocampal LTP in Dmd(mdx) mice is not restricted to short-lasting mechanisms, but also affects the maintenance phase of LTP of both synaptic efficacy and neuronal excitability. We conclude that dystrophin loss alters memory consolidation in both spatial and nonspatial learning tasks, at least in part due to altered synaptic plasticity mechanisms, and suggest that the severity of the deficits may depend on the nature of the training procedure.
Insights
Duchenne muscular dystrophy (DMD) causes long-term memory deficits in mice by affecting synaptic plasticity. Dystrophin deficiency impairs memory consolidation in spatial and nonspatial learning tasks.
Area of Science:
- Neuroscience
- Genetics
- Cell Biology
Background:
- Duchenne muscular dystrophy (DMD) is linked to cognitive deficits, potentially due to neuronal dystrophin deficiency.
- The precise nature and biological basis of memory impairments in the Dmd(mdx) mouse model of DMD remain unclear.
Purpose of the Study:
- To characterize memory impairments in Dmd(mdx) mice.
- To investigate the underlying biological mechanisms, specifically synaptic plasticity, in the Dmd(mdx) model.
Main Methods:
- Behavioral testing of Dmd(mdx) mice using object recognition and water maze tasks.
- Electrophysiological recordings to assess long-term potentiation (LTP) in the hippocampus (CA1 region).
Main Results:
- Dmd(mdx) mice exhibited impaired long-term object recognition memory but intact short-term memory.
- Long-term spatial memory was impaired in Dmd(mdx) mice, while initial learning (acquisition) remained unaffected.
- Abnormal enhancement of CA1 hippocampal LTP, affecting both synaptic efficacy and neuronal excitability maintenance, was observed in Dmd(mdx) mice.
Conclusions:
- Dystrophin loss in Dmd(mdx) mice disrupts memory consolidation for both spatial and nonspatial tasks.
- Altered synaptic plasticity mechanisms are implicated in these memory deficits.
- The severity of memory deficits may be influenced by the training procedure's nature.
