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The Journal of Neuroscience, April 1, 2000, 20(7):2534-2542

Early and Selective Loss of Neuromuscular Synapse Subtypes with Low Sprouting Competence in Motoneuron Diseases

Dunja Frey¹, Corinna Schneider¹, Lan Xu¹, Jacques Borg², Will Spooren³, and Pico Caroni¹

¹ Friedrich Miescher Institute, CH-4058 Basel, Switzerland, ² Pharmacology Department, Université Louis Pasteur 67200, Strassbourg, France, and ³ Central Nervous System Research, Novartis, 4001 Basel, Switzerland

The addition or loss of synapses in response to changes in activity, disease, or aging is a major aspect of nervous system plasticity in the adult. The mechanisms that affect the turnover and maintenance of synapses in the adult are poorly understood and are difficult to investigate in the brain. Here, we exploited a unique anatomical arrangement in the neuromuscular system to determine whether subtypes of synapses can differ in anatomical plasticity and vulnerability. In three genetic mouse models of motoneuron disease of diverse origin and severity, we observed a gradual and selective loss of synaptic connections that begun long before the onset of clinical deficits and correlated with the timing of disease progression. A subgroup of fast-type (fast-fatiguable) neuromuscular synapses was highly vulnerable and was lost very early on. In contrast, slow-type synapses resisted up to the terminal phase of the disease. Muscle-specific differences were also evident. Similar selective losses were detected in aged mice. These selective vulnerability properties of synapses coincided with hitherto unrecognized major differences in stimulus-induced anatomical plasticity that could also be revealed in healthy mice. Using paralysis and/or growth-associated protein 43 overexpression to induce synaptic sprouting, we found that slow-type, disease-resistant synapses were particularly plastic. In contrast, fast-type synapses with the highest vulnerability failed to exhibit any stimulus-induced change. The results reveal pronounced subtype specificity in the anatomical plasticity and susceptibility to loss of neuromuscular synapses and suggest that degenerative motoneuron diseases involve a common early pathway of selective and progressive synaptic weakening also associated with aging.

Key words: selective vulnerability; motoneuron disease; synapse subtypes; neuromuscular junction; GAP43; anatomical plasticity; Botulinum toxin A

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Copyright © 2000 Society for Neuroscience  0270-6474/00/2072534-09$05.00/0

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