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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Biochem+Biophys+Rep
2015 ; 4
(ä): 351-356
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Salbutamol inhibits ubiquitin-mediated survival motor neuron protein degradation
in spinal muscular atrophy cells
#MMPMID29124224
Harahap NIF
; Nurputra DK
; Ar Rochmah M
; Shima A
; Morisada N
; Takarada T
; Takeuchi A
; Tohyama Y
; Yanagisawa S
; Nishio H
Biochem Biophys Rep
2015[Dec]; 4
(ä): 351-356
PMID29124224
show ga
Spinal muscular atrophy (SMA) is a common autosomal recessive neuromuscular
disorder that is currently incurable. SMA is caused by decreased levels of the
survival motor neuron protein (SMN), as a result of loss or mutation of SMN1.
Although the SMN1 homolog SMN2 also produces some SMN protein, it does not fully
compensate for the loss or dysfunction of SMN1. Salbutamol, a ?2-adrenergic
receptor agonist and well-known bronchodilator used in asthma patients, has
recently been shown to ameliorate symptoms in SMA patients. However, the precise
mechanism of salbutamol action is unclear. We treated SMA fibroblast cells
lacking SMN1 and HeLa cells with salbutamol and analyzed SMN2 mRNA and SMN
protein levels in SMA fibroblasts, and changes in SMN protein ubiquitination in
HeLa cells. Salbutamol increased SMN protein levels in a dose-dependent manner in
SMA fibroblast cells lacking SMN1, though no significant changes in SMN2 mRNA
levels were observed. Notably, the salbutamol-induced increase in SMN was blocked
by a protein kinase A (PKA) inhibitor and deubiquitinase inhibitor, respectively.
Co-immunoprecipitation assay using HeLa cells showed that ubiquitinated SMN
levels decreased in the presence of salbutamol, suggesting that salbutamol
inhibited ubiquitination. The results of this study suggest that salbutamol may
increase SMN protein levels in SMA by inhibiting ubiquitin-mediated SMN
degradation via activating ?2-adrenergic receptor-PKA pathways.