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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 Nat+Commun
2017 ; 8
(1
): 548
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Ampk phosphorylation of Ulk1 is required for targeting of mitochondria to
lysosomes in exercise-induced mitophagy
#MMPMID28916822
Laker RC
; Drake JC
; Wilson RJ
; Lira VA
; Lewellen BM
; Ryall KA
; Fisher CC
; Zhang M
; Saucerman JJ
; Goodyear LJ
; Kundu M
; Yan Z
Nat Commun
2017[Sep]; 8
(1
): 548
PMID28916822
show ga
Mitochondrial health is critical for skeletal muscle function and is improved by
exercise training through both mitochondrial biogenesis and removal of
damaged/dysfunctional mitochondria via mitophagy. The mechanisms underlying
exercise-induced mitophagy have not been fully elucidated. Here, we show that
acute treadmill running in mice causes mitochondrial oxidative stress at 3-12?h
and mitophagy at 6?h post-exercise in skeletal muscle. These changes were
monitored using a novel fluorescent reporter gene, pMitoTimer, that allows
assessment of mitochondrial oxidative stress and mitophagy in vivo, and were
preceded by increased phosphorylation of AMP activated protein kinase (Ampk) at
tyrosine 172 and of unc-51 like autophagy activating kinase 1 (Ulk1) at serine
555. Using mice expressing dominant negative and constitutively active Ampk in
skeletal muscle, we demonstrate that Ulk1 activation is dependent on Ampk.
Furthermore, exercise-induced metabolic adaptation requires Ulk1. These findings
provide direct evidence of exercise-induced mitophagy and demonstrate the
importance of Ampk-Ulk1 signaling in skeletal muscle.Exercise is associated with
biogenesis and removal of dysfunctional mitochondria. Here the authors use a
mitochondrial reporter gene to demonstrate the occurrence of mitophagy following
exercise in mice, and show this is dependent on AMPK and ULK1 signaling.
|*Exercise
[MESH]
|*Mitophagy
[MESH]
|AMP-Activated Protein Kinases/chemistry/genetics/*metabolism
[MESH]