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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 Am+J+Pathol
2014 ; 184
(12
): 3284-98
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?-catenin links hepatic metabolic zonation with lipid metabolism and diet-induced
obesity in mice
#MMPMID25300578
Behari J
; Li H
; Liu S
; Stefanovic-Racic M
; Alonso L
; O'Donnell CP
; Shiva S
; Singamsetty S
; Watanabe Y
; Singh VP
; Liu Q
Am J Pathol
2014[Dec]; 184
(12
): 3284-98
PMID25300578
show ga
?-catenin regulates the establishment of hepatic metabolic zonation. To elucidate
the functional significance of liver metabolic zonation in the chronically
overfed state in vivo, we fed a high-fat diet (HFD) to hepatocyte-specific
?-catenin transgenic (TG) and knockout (KO) mice. Chow-fed TG and KO mice had
normal liver histologic findings and body weight. However, HFD-fed TG mice
developed prominent perivenous steatosis with periportal sparing. In contrast,
HFD-fed KO mice had increased lobular inflammation and hepatocyte apoptosis.
HFD-fed TG mice rapidly developed diet-induced obesity and systemic insulin
resistance, but KO mice were resistant to diet-induced obesity. However,
?-catenin did not directly affect hepatic insulin signaling, suggesting that the
metabolic effects of ?-catenin occurred via a parallel pathway. Hepatic
expression of key glycolytic and lipogenic genes was higher in HFD-fed TG and
lower in KO mice compared with wild-type mice. KO mice also exhibited defective
hepatic fatty acid oxidation and fasting ketogenesis. Hepatic levels of hypoxia
inducible factor-1?, an oxygen-sensitive transcriptional regulator of glycolysis
and a known ?-catenin binding partner, were higher in HFD-fed TG and lower in KO
mice. KO mice had attenuated perivenous hypoxia, suggesting disruption of the
normal sinusoidal oxygen gradient, a major determinant of liver carbohydrate and
liver metabolism. Canonical Wnt signaling in hepatocytes is essential for the
development of diet-induced fatty liver and obesity.