Endoplasmic reticulum stress up‐regulates Nedd4‐2 to induce autophagy
Autor: | Xiao-Yi Zeng, Ruo-Qiong Sun, Eunjung Jo, Ji-Ming Ye, Stanley M H Chan, Terence P. Herbert, Daria Camera, Hao Wang, Juan C. Molero |
---|---|
Rok vydání: | 2016 |
Předmět: |
Male
X-Box Binding Protein 1 0301 basic medicine Autophagosome Nedd4 Ubiquitin Protein Ligases Ubiquitin-Protein Ligases NEDD4 macromolecular substances Endoplasmic Reticulum BAG3 Biochemistry Mice 03 medical and health sciences 0302 clinical medicine Autophagy Genetics Animals Humans Molecular Biology Endosomal Sorting Complexes Required for Transport biology Endoplasmic reticulum Fibroblasts Up-Regulation Ubiquitin ligase Cell biology HEK293 Cells 030104 developmental biology Gene Expression Regulation Liver biology.protein Unfolded protein response 030217 neurology & neurosurgery HeLa Cells Biotechnology |
Zdroj: | The FASEB Journal. 30:2549-2556 |
ISSN: | 1530-6860 0892-6638 |
Popis: | The accumulation of unfolded proteins within the endoplasmic reticulum (ER) causes ER stress and activation of unfolded protein response (UPR). This response can trigger ER-associated degradation and autophagy, which clear unfolded proteins and restore protein homeostasis. Recently, it has become clear that ubiquitination plays an important role in the regulation of autophagy. In the present study, we investigated how the E3 ubiquitin ligase neural precursor cell-expressed, developmentally down-regulated protein 4-2 (Nedd4-2) interacts with ER stress and autophagy. In mice, we found that an increase in the expression of Nedd4-2, which was concomitant with the activation of the UPR and autophagy, was caused by a prolonged high-fructose and high-fat diet that induces ER stress in the liver. Pharmacologic induction of ER stress also led to an increase in Nedd4-2 expression in cultured cells, which was coincident with UPR and autophagy activation. The inhibition of inositol-requiring enzyme 1 significantly suppressed Nedd4-2 expression. Moreover, increased Nedd4-2 expression in vivo was closely associated with the activation of inositol-requiring enzyme 1 and increased expression of the spliced form of X-box binding protein 1. Furthermore, knockdown of Nedd4-2 in cultured cells suppressed both basal autophagy and ER stress-induced autophagy, whereas overexpression of Nedd4-2-induced autophagy. Taken together, our findings provide evidence that Nedd4-2 is up-regulated in response to ER stress by the spliced form of X-box binding protein 1 and that this is important in the induction of an appropriate autophagic response.-Wang, H. Sun, R.-Q., Camera, D., Zeng, X.-Y., Jo, E., Chan, S. M. H., Herbert, T. P., Molero, J. C., Ye, J.-M. Endoplasmic reticulum stress up-regulates Nedd4-2 to induce autophagy. |
Databáze: | OpenAIRE |
Externí odkaz: |