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2017 ; 7
(1
): 9030
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Pioglitazone Enhances Cytosolic Lipolysis, ?-oxidation and Autophagy to
Ameliorate Hepatic Steatosis
#MMPMID28831172
Hsiao PJ
; Chiou HC
; Jiang HJ
; Lee MY
; Hsieh TJ
; Kuo KK
Sci Rep
2017[Aug]; 7
(1
): 9030
PMID28831172
show ga
Non-alcoholic fatty liver disease closely contributes to the development of
obesity and insulin resistance. Even though pioglitazone has been reported to
effectively lessen hepatic steatosis in human studies, its molecular mechanism
remains unclear. This study is designed to investigate the regulation of
cytosolic lipolysis, ?-oxidation and autophagy by pioglitazone in a mice model of
high fat diet (HFD) and cell model incubated with palmitic acid. Our results
revealed hepatic steatosis was apparently induced by HFD and it was significantly
reversed by pioglitazone. The serum insulin and hepatic triglyceride content was
significantly decreased by co-administered pioglitazone with HFD. Hepatic
expression of cytosolic-lipolysis related proteins (ATGL, HSL), ?-oxidation
(CPT-1A) and autophagy-related proteins (ATG7, LC3, LAL) was significantly
enhanced by pioglitazone. Knockdown PPAR?/PPAR? in AML12 cells significantly and
proportionally reduced the expressions of ATGL, CPT-1A and LC3II, which was
induced by pioglitazone. Furthermore, facilitation of the autophagic flux by
pioglitazone was obviously blocked by lysosomal inhibitor, leupeptin, to
demonstrate accumulation of the LC3II and intracellular lipid in AML12 cells. Our
results demonstrated that pioglitazone attenuating the hepatic steatosis may be
mediated by enhancing cytosolic lipolysis, ?-oxidation and autophagy in a PPAR?
and PPAR? dependent manner.