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2017 ; 7
(ä): 43949
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IGF-1 potentiates sensory innervation signalling by modulating the mitochondrial
fission/fusion balance
#MMPMID28276453
Ding Y
; Li J
; Liu Z
; Liu H
; Li H
; Li Z
Sci Rep
2017[Mar]; 7
(ä): 43949
PMID28276453
show ga
Restoring the contractile function of long-term denervated skeletal muscle (SKM)
cells is difficult due to the long period of denervation, which causes a loss of
contractility. Although sensory innervation is considered a promising protective
approach, its effect is still restricted. In this study, we introduced
insulin-like growth factor-1 (IGF-1) as an efficient protective agent and
observed that IGF-1 potentiated the effects of sensory protection by preventing
denervated muscle atrophy and improving the condition of denervated muscle cells
in vivo and in vitro. IGF-1-induced Akt phosphorylation suppressed the
mitochondrial outer-membrane protein Mul1 expression, which is a key step on
preserving contractile property of sensory innervated SKM cells. Mul1
overexpression interfered with the balance between mitochondrial fusion and
fission and was a key node for blocking the effects of IGF-1 that preserved the
contractility of sensory-innervated SKM cells. Activation of AMP-activated
protein kinase ? (AMPK?), a mitochondrial downstream target, could block the
effects of IGF-1. These data provide novel evidence that might be applied when
searching for new approaches to improve the functional condition of long-term
denervated SKM cells by increasing sensory protection using the IGF-1 signalling
system to modulate the balance between mitochondrial fusion and fission.