AAV9-mediated SMN gene therapy rescues cardiac desmin but not Lamin A/C and elastin dysregulation in Smn2B/- spinal muscular atrophy mice
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Structural, functional and molecular cardiac defects have been reported in spinal muscular atrophy (SMA) patients and mouse models. Previous quantitative proteomics analyses demonstrated widespread molecular defects in the severe Taiwanese SMA mouse model. Whether such changes are conserved across different mouse models, including less severe forms of the disease, has yet to be established. Here, using the same high-resolution proteomics approach in the less-severe Smn2B/− SMA mouse model, 277 proteins were found to be differentially abundant at a symptomatic timepoint (post-natal day (P) 18), 50 of which were similarly dysregulated in severe Taiwanese SMA mice. Bioinformatics analysis linked many of the differentially abundant proteins to cardiovascular development and function, with intermediate filaments highlighted as an enriched cellular compartment in both datasets. Lamin A/C was increased in the cardiac tissue, whereas another intermediate filament protein, desmin, was reduced. The extracellular matrix (ECM) protein, elastin, was also robustly decreased in the heart of Smn2B/− mice. AAV9-SMN1-mediated gene therapy rectified low levels of survival motor neuron protein and restored desmin levels in heart tissues of Smn2B/− mice. In contrast, AAV9-SMN1 therapy failed to correct lamin A/C or elastin levels. Intermediate filament proteins and the ECM have key roles in cardiac function and their dysregulation may explain cardiac impairment in SMA, especially since mutations in genes encoding these proteins cause other diseases with cardiac aberration. Cardiac pathology may need to be considered in the long-term care of SMA patients, as it is unclear whether currently available treatments can fully rescue peripheral pathology in SMA.
Brown , S J , Šoltić , D , Synowsky , S A , Shirran , S L , Chilcott , E , Shorrock , H K , Gillingwater , T H , Yáñez-Muñoz , R J , Schneider , B , Bowerman , M & Fuller , H R 2023 , ' AAV9-mediated SMN gene therapy rescues cardiac desmin but not Lamin A/C and elastin dysregulation in Smn 2B/- spinal muscular atrophy mice ' , Human Molecular Genetics , vol. 32 , no. 20 , pp. 2950-2965 . https://doi.org/10.1093/hmg/ddad121
Human Molecular Genetics
Copyright © The Author(s) 2023. Published by Oxford University Press. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
DescriptionThis work was supported by Great Ormond Street Hospital Charity (GOSH) and SPARKS Children’s Medical Research Charity (Grant No. V5018 to H.R.F.). M.B. acknowledges general financial support from SMA Angels Charity, SMA UK, Muscular Dystrophy UK, Action Medical Research, Academy of Medical Sciences and Association Française contre les Myopathies for SMA research in her laboratory. H.K.S. and T.H.G. acknowledge support from the Euan MacDonald Centre for Motor Neuron Disease Research and SMA Europe. E.M.C. was partially funded by a scholarship from Royal Holloway University of London. R.J.Y.-M. acknowledges general financial support from SMA UK (formerly The SMA Trust), through the UK SMA Research Consortium, for SMA research in his laboratory.
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