Reduced SMN protein impairs maturation of the neuromuscular junctions in mouse models of spinal muscular atrophy.

Abstract:

:Spinal muscular atrophy (SMA) is a common pediatric neuromuscular disorder caused by insufficient levels of the survival of motor neuron (SMN) protein. Studies involving SMA patients and animal models expressing the human SMN2 gene have yielded relatively little information about the earliest cellular consequences of reduced SMN protein. In this study, we have used severe- and mild-SMN2 expressing mouse models of SMA as well as material from human patients to understand the initial stages of neurodegeneration in the human disease. We show that the earliest structural defects appear distally and involve the neuromuscular synapse. Insufficient SMN protein arrests the post-natal development of the neuromuscular junction (NMJ), impairing the maturation of acetylcholine receptor (AChR) clusters into 'pretzels'. Pre-synaptic defects include poor terminal arborization and intermediate filament aggregates which may serve as a useful biomarker of the disease. These defects are reflected in functional deficits at the NMJ characterized by intermittent neurotransmission failures. We suggest that SMA might best be described as a NMJ synaptopathy and that one promising means of treating it could involve maintaining function at the NMJ.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Kariya S,Park GH,Maeno-Hikichi Y,Leykekhman O,Lutz C,Arkovitz MS,Landmesser LT,Monani UR

doi

10.1093/hmg/ddn156

subject

Has Abstract

pub_date

2008-08-15 00:00:00

pages

2552-69

issue

16

eissn

0964-6906

issn

1460-2083

pii

ddn156

journal_volume

17

pub_type

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