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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 EMBO+Mol+Med 2015 ; 7 (6): 802-18 Nephropedia Template TP
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Defects in mitophagy promote redox-driven metabolic syndrome in the absence of TP53INP1 #MMPMID25828351
Seillier M; Pouyet L; N'Guessan P; Nollet M; Capo F; Guillaumond F; Peyta L; Dumas JF; Varrault A; Bertrand G; Bonnafous S; Tran A; Meur G; Marchetti P; Ravier MA; Dalle S; Gual P; Muller D; Rutter GA; Servais S; Iovanna JL; Carrier A
EMBO Mol Med 2015[Jun]; 7 (6): 802-18 PMID25828351show ga
The metabolic syndrome covers metabolic abnormalities including obesity and type 2 diabetes (T2D). T2D is characterized by insulin resistance resulting from both environmental and genetic factors. A genome-wide association study (GWAS) published in 2010 identified TP53INP1 as a new T2D susceptibility locus, but a pathological mechanism was not identified. In this work, we show that mice lacking TP53INP1 are prone to redox-driven obesity and insulin resistance. Furthermore, we demonstrate that the reactive oxygen species increase in TP53INP1-deficient cells results from accumulation of defective mitochondria associated with impaired PINK/PARKIN mitophagy. This chronic oxidative stress also favors accumulation of lipid droplets. Taken together, our data provide evidence that the GWAS-identified TP53INP1 gene prevents metabolic syndrome, through a mechanism involving prevention of oxidative stress by mitochondrial homeostasis regulation. In conclusion, this study highlights TP53INP1 as a molecular regulator of redox-driven metabolic syndrome and provides a new preclinical mouse model for metabolic syndrome clinical research.