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Cell Commun Signal ; 18(1): 147, 2020 09 10.
Artigo em Inglês | MEDLINE | ID: mdl-32912335

RESUMO

BACKGROUND: Deficiency of mitochondrial sirtuin 3 (SIRT3), a NAD+-dependent protein deacetylase that maintains redox status and lipid homeostasis, contributes to hepatic steatosis. In this study, we investigated additional mechanisms that might play a role in aggravating hepatic steatosis in Sirt3-deficient mice fed a high-fat diet (HFD). METHODS: Studies were conducted in wild-type (WT) and Sirt3-/- mice fed a standard diet or a HFD and in SIRT3-knockdown human Huh-7 hepatoma cells. RESULTS: Sirt3-/- mice fed a HFD presented exacerbated hepatic steatosis that was accompanied by decreased expression and DNA-binding activity of peroxisome proliferator-activated receptor (PPAR) α and of several of its target genes involved in fatty acid oxidation, compared to WT mice fed the HFD. Interestingly, Sirt3 deficiency in liver and its knockdown in Huh-7 cells resulted in upregulation of the nuclear levels of LIPIN1, a PPARα co-activator, and of the protein that controls its levels and localization, hypoxia-inducible factor 1α (HIF-1α). These changes were prevented by lipid exposure through a mechanism that might involve a decrease in succinate levels. Finally, Sirt3-/- mice fed the HFD showed increased levels of some proteins involved in lipid uptake, such as CD36 and the VLDL receptor. The upregulation in CD36 was confirmed in Huh-7 cells treated with a SIRT3 inhibitor or transfected with SIRT3 siRNA and incubated with palmitate, an effect that was prevented by the Nrf2 inhibitor ML385. CONCLUSION: These findings demonstrate new mechanisms by which Sirt3 deficiency contributes to hepatic steatosis. Video abstract.


Assuntos
Antígenos CD36/metabolismo , Fígado Gorduroso/genética , Subunidade alfa do Fator 1 Induzível por Hipóxia/metabolismo , Fator 2 Relacionado a NF-E2/metabolismo , Fosfatidato Fosfatase/metabolismo , Sirtuína 3/genética , Animais , Linhagem Celular , Fígado Gorduroso/metabolismo , Fígado Gorduroso/patologia , Deleção de Genes , Humanos , Lipogênese , Masculino , Camundongos Endogâmicos C57BL , Transdução de Sinais , Sirtuína 3/metabolismo
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