Journal Article

SAHA ameliorates the SMA phenotype in two mouse models for spinal muscular atrophy

Markus Riessland, Bastian Ackermann, Anja Förster, Miriam Jakubik, Jan Hauke, Lutz Garbes, Ina Fritzsche, Ylva Mende, Ingmar Blumcke, Eric Hahnen and Brunhilde Wirth

in Human Molecular Genetics

Volume 19, issue 8, pages 1492-1506
Published in print April 2010 | ISSN: 0964-6906
Published online January 2010 | e-ISSN: 1460-2083 | DOI: https://dx.doi.org/10.1093/hmg/ddq023
SAHA ameliorates the SMA phenotype in two mouse models for spinal muscular atrophy

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Proximal spinal muscular atrophy (SMA) is a common autosomal recessively inherited neuromuscular disorder determined by functional impairment of α-motor neurons within the spinal cord. SMA is caused by functional loss of the survival motor neuron gene 1 (SMN1), whereas disease severity is mainly influenced by the number of SMN2 copies. SMN2, which produces only low levels of full-length mRNA/protein, can be modulated by small molecules and drugs, thus offering a unique possibility for SMA therapy. Here, we analysed suberoylanilide hydroxamic acid (SAHA), a FDA-approved histone deacetylase inhibitor, as potential drug in two severe SMA mouse models each carrying two SMN2 transgenes: US-SMA mice with one SMN2 per allele (Smn−/−;SMN2tg/tg) and Taiwanese-SMA mice with two SMN2 per allele (Smn−/−;SMN2tg/wt), both on pure FVB/N background. The US-SMA mice were embryonically lethal with heterozygous males showing significantly reduced fertility. SAHA treatment of pregnant mothers rescued the embryonic lethality giving rise to SMA offspring. By using a novel breeding strategy for the Taiwanese model (Smn−/−;SMN2tg/tg × Smn−/+ mice), we obtained 50% SMA offspring that survive ∼10 days and 50% control carriers in each litter. Treatment with 25 mg/kg twice daily SAHA increased lifespan of SMA mice by 30%, significantly improved motor function abilities, reduced degeneration of motor neurons within the spinal cord and increased the size of neuromuscular junctions and muscle fibers compared with vehicle-treated SMA mice. SMN RNA and protein levels were significantly elevated in various tissues including spinal cord and muscle. Hence, SAHA, which lessens the progression of SMA, might be suitable for SMA therapy.

Journal Article.  8934 words.  Illustrated.

Subjects: Genetics and Genomics

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