期刊
NEUROMUSCULAR DISORDERS
卷 28, 期 5, 页码 427-442出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.nmd.2018.02.013
关键词
Acetylcholine receptor; Duchenne muscular dystrophy; Dystrophin; mdx mice; Neuromuscular junction; Synaptic transmission
资金
- 'Prinses Beatrix Spierfonds' [W.OR11-11]
- 'Stichting Spieren voor Spieren'
- 'L'Association Francaise contre les myopathies' [15042, 16686]
- Dutch Duchenne Parent Project
Dystrophin is a sub-sarcolemmal component of skeletal muscle fibres and is enriched at the postsynaptic membrane of the neuromuscular junction (NMJ). In the mdx mouse, dystrophin absence not only causes muscle damage but also mild synaptic dysfunctions and clear morphological aberrations at NMJs. In particular, reduction of postsynaptic sensitivity for the neurotransmitter acetylcholine and extra exhaustion of presynaptic acetylcholine release during intense synaptic activity exists. Current experimental therapeutic approaches in Duchenne muscular dystrophy aim to restore dystrophin expression. An important question is what dystrophin levels are needed to improve muscle function. Recent experimental and clinical studies suggested that levels as low as a few percent of normal can be beneficial. Similarly, it is of interest to know how dystrophin levels relate to NMJ function and morphology. We investigated NMJs of a series of mdx-Xist(Delta hs) mice, which expressed dystrophin between similar to 2% and 19% of normal. Most functional and morphological NMJ parameters of these mice remained comparable to mdx. On the other hand, mdx''- mice (expressing similar to 50% dystrophin) showed normal NMJ features. Thus, the minimal dystrophin level required for normal NMJ function and morphology lies between 19% and 50% of normal when expression of dystrophin is not uniform. (C) 2018 The Authors. Published by Elsevier B.V.
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