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2018 ; 10
(7
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
The AMPK agonist 5-aminoimidazole-4-carboxamide ribonucleotide (AICAR), but not
metformin, prevents inflammation-associated cachectic muscle wasting
#MMPMID29844217
Hall DT
; Griss T
; Ma JF
; Sanchez BJ
; Sadek J
; Tremblay AMK
; Mubaid S
; Omer A
; Ford RJ
; Bedard N
; Pause A
; Wing SS
; Di Marco S
; Steinberg GR
; Jones RG
; Gallouzi IE
EMBO Mol Med
2018[Jul]; 10
(7
): ä PMID29844217
show ga
Activation of AMPK has been associated with pro-atrophic signaling in muscle.
However, AMPK also has anti-inflammatory effects, suggesting that in cachexia, a
syndrome of inflammatory-driven muscle wasting, AMPK activation could be
beneficial. Here we show that the AMPK agonist AICAR suppresses IFN?/TNF?-induced
atrophy, while the mitochondrial inhibitor metformin does not. IFN?/TNF? impair
mitochondrial oxidative respiration in myotubes and promote a metabolic shift to
aerobic glycolysis, similarly to metformin. In contrast, AICAR partially restored
metabolic function. The effects of AICAR were prevented by the AMPK inhibitor
Compound C and were reproduced with A-769662, a specific AMPK activator. AICAR
and A-769662 co-treatment was found to be synergistic, suggesting that the
anti-cachectic effects of these drugs are mediated through AMPK activation. AICAR
spared muscle mass in mouse models of cancer and LPS induced atrophy. Together,
our findings suggest a dual function for AMPK during inflammation-driven atrophy,
wherein it can play a protective role when activated exogenously early in disease
progression, but may contribute to anabolic suppression and atrophy when
activated later through mitochondrial dysfunction and subsequent metabolic
stress.
|AMP-Activated Protein Kinase Kinases
[MESH]
|Aminoimidazole Carboxamide/*analogs & derivatives/therapeutic use
[MESH]