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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 Mol+Endocrinol
2015 ; 29
(11
): 1558-70
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CAR Suppresses Hepatic Gluconeogenesis by Facilitating the Ubiquitination and
Degradation of PGC1?
#MMPMID26407237
Gao J
; Yan J
; Xu M
; Ren S
; Xie W
Mol Endocrinol
2015[Nov]; 29
(11
): 1558-70
PMID26407237
show ga
The constitutive androstane receptor (CAR) and peroxisome proliferator-activated
receptor gamma coactivator-1? (PGC1?) are master regulators of drug metabolism
and gluconeogenesis, respectively. In supporting the cross talk between drug
metabolism and energy metabolism, activation of CAR has been shown to suppress
hepatic gluconeogenesis and ameliorate hyperglycemia in vivo, but the underlying
molecular mechanism remains elusive. In this study, we demonstrated that CAR
suppressed hepatic gluconeogenic gene expression through posttranslational
regulation of the subcellular localization and degradation of PGC1?. Activated
CAR translocated into the nucleus and served as an adaptor protein to recruit
PGC1? to the Cullin1 E3 ligase complex for ubiquitination. The interaction
between CAR and PGC1? also led to their sequestration within the promyelocytic
leukemia protein-nuclear bodies, where PGC1? and CAR subsequently underwent
proteasomal degradation. Taken together, our findings revealed an unexpected
function of CAR in recruiting an E3 ligase and targeting the gluconeogenic
activity of PGC1?. Both drug metabolism and gluconeogenesis are energy-demanding
processes. The negative regulation of PGC1? by CAR may represent a cellular
adaptive mechanism to accommodate energy-restricted conditions.