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2016 ; 30
(9
): 1034-46
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Chronic AMPK activation via loss of FLCN induces functional beige adipose tissue
through PGC-1?/ERR?
#MMPMID27151976
Yan M
; Audet-Walsh É
; Manteghi S
; Dufour CR
; Walker B
; Baba M
; St-Pierre J
; Gigučre V
; Pause A
Genes Dev
2016[May]; 30
(9
): 1034-46
PMID27151976
show ga
The tumor suppressor folliculin (FLCN) forms a repressor complex with
AMP-activated protein kinase (AMPK). Given that AMPK is a master regulator of
cellular energy homeostasis, we generated an adipose-specific Flcn (Adipoq-FLCN)
knockout mouse model to investigate the role of FLCN in energy metabolism. We
show that loss of FLCN results in a complete metabolic reprogramming of adipose
tissues, resulting in enhanced oxidative metabolism. Adipoq-FLCN knockout mice
exhibit increased energy expenditure and are protected from high-fat diet
(HFD)-induced obesity. Importantly, FLCN ablation leads to chronic
hyperactivation of AMPK, which in turns induces and activates two key
transcriptional regulators of cellular metabolism, proliferator-activated
receptor ? (PPAR?) coactivator-1? (PGC-1?) and estrogen-related receptor ?
(ERR?). Together, the AMPK/PGC-1?/ERR? molecular axis positively modulates the
expression of metabolic genes to promote mitochondrial biogenesis and activity.
In addition, mitochondrial uncoupling proteins as well as other markers of brown
fat are up-regulated in both white and brown FLCN-null adipose tissues,
underlying the increased resistance of Adipoq-FLCN knockout mice to cold
exposure. These findings identify a key role of FLCN as a negative regulator of
mitochondrial function and identify a novel molecular pathway involved in the
browning of white adipocytes and the activity of brown fat.