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Neddylation inhibition ameliorates steatosis in NAFLD by boosting hepatic fatty acid oxidation via the DEPTOR-mTOR axis

Autores: Serrano-Macia, M.; Simón, J.; González-Rellán, M. J.; Azkargorta, M.; Goikoetxea-Usandizaga, N.; Lopitz-Otsoa, F.; Saenz de Urturi, D.; Rodríguez-Agudo, R.; Lachiondo-Ortega, S.; Mercado-Gómez, M.; Gutiérrez de Juan, V.; Bizkarguenaga, M.; Fernández-Ramos, D.; Buque, X.; Baselli, G. A.; Valenti, L. V. C.; Iruzubieta, P.; Crespo, J.; Villa, E.; Banales, J. M.; Ávila Zaragoza, Matías Antonio; Marin, J. J. G.; Aspichueta, P.; Sutherland, J.; Barrio, R.; Mayor, U.; Elortza, F.; Xirodimas, D. P.; Nogueiras, R.; Delgado, T. C. (Autor de correspondencia); Martinez-Chantar, M. L. (Autor de correspondencia)
Título de la revista: MOLECULAR METABOLISM
ISSN: 2212-8778
Volumen: 53
Páginas: 101275
Fecha de publicación: 2021
Objective: Neddylation is a druggable and reversible ubiquitin-like post-translational modification upregulated in many diseases, including liver fibrosis, hepatocellular carcinoma, and more recently, non-alcoholic fatty liver disease (NAFLD). Herein, we propose to address the effects of neddylation inhibition and the underlying mechanisms in pre-clinical models of NAFLD. Methods: Hepatic neddylation measured by immunohistochemical analysis and NEDD8 serum levels measured by ELISA assay were evaluated in NAFLD clinical and pre-clinical samples. The effects of neddylation inhibition by using a pharmacological small inhibitor, MLN4924, or molecular approaches were assessed in isolated mouse hepatocytes and pre-clinical mouse models of diet-induced NAFLD, male adult C57BL/6 mice, and the AlfpCre transgenic mice infected with AAV-DIO-shNedd8. Results: Neddylation inhibition reduced lipid accumulation in oleic acid-stimulated mouse primary hepatocytes and ameliorated liver steatosis, preventing lipid peroxidation and inflammation in the mouse models of diet-induced NAFLD. Under these conditions, increased Deptor levels and the concomitant repression of mTOR signaling were associated with augmented fatty acid oxidation and reduced lipid content. Moreover, Deptor silencing in isolated mouse hepatocytes abolished the anti-steatotic effects mediated by neddylation inhibition. Finally, serum NEDD8 levels correlated with hepatic neddylation during the disease progression in the clinical and pre-clinical models Conclusions: Overall, the upregulation of Deptor, driven by neddylation inhibition, is proposed as a novel effective target and therapeutic approach to tackle NAFLD.