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Títol:	SIRT3 deficiency exacerbates fatty liver by attenuating the HIF1α-LIPIN 1 pathway and increasing CD36 through Nrf2
Autor/a:	Barroso, Emma; Rodríguez-Rodríguez, Rosalía; Zarei, Mohammad; Pizarro-Delgado, Javier; Planavila, Anna; Palomer, Xavier; Villarroya, Francesc; Vázquez-Carrera, Manuel
Notes:	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.
Matèries:	-Proteïnes -Homeòstasi -Esteatosi hepàtica -Olis i greixos -Proteínas -Homeostasis -Hepatopatía grasa -Aceites y grasas -Proteins -Homeostasis -Hepatic steatosis -Oils and fats -61
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Tipus de document:	Article Article - Versió publicada
Publicat per:	Springer Nature
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