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Decreased stathmin expression ameliorates neuromuscular defects but fails to prolong survival in a mouse model of spinal muscular atrophy.

Abstract：

:Spinal muscular atrophy (SMA), a genetic neurodegenerative disorder, is caused by mutations or deletions in the survival of motor neuron 1 (SMN1) gene that result in SMN deficiency. SMN deficiency impairs microtubule networks in Smn-deficient cells and in SMA-like motor neuron cultures. Microtubule defects can be restored by knockdown of the stathmin gene (Stmn), which is upregulated in SMA. However, whether in vivo reduction of stathmin levels could improve the pathology of SMA has not been investigated. Here we generated SMA-like mice in a Stmn knockout (KO) background through a series of genetic crosses. Analyses of motor performance and histology showed that heterozygous StmnKO (Stmn(+/-)) but not homozygous StmnKO (Stmn(-/-)) ameliorates some SMA defects, with increased microtubule densities in sciatic axons, improved motor performance, enhanced NMJ maturation, and mitigated neuroinflammation. However, Stmn deletion does not prolong the lifespan of SMA-like mice, suggesting that stathmin dysregulation and microtubule disruption are not a cause but rather a consequence of SMA pathology. This work demonstrates that limiting the amount of stathmin in SMA-like mice is effective in reducing their neuromuscular defects, whereas induced aberrant expression of stathmin in SMA-like animals is detrimental.

journal_name

Neurobiol Dis

journal_title

Neurobiology of disease

authors

Wen HL,Ting CH,Liu HC,Li H,Lin-Chao S

doi

10.1016/j.nbd.2012.11.015

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

94-103

eissn

0969-9961

issn

1095-953X

pii

S0969-9961(12)00378-6

journal_volume

52

pub_type

杂志文章

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