Alkaline ceramidase 2 is a novel direct target of p53 and induces autophagy and apoptosis through ROS generation
| Autor: | Fangzhou Song, Yuelei Jin, Qing He, Qing Ai, Yi Li, Yitao Wang, Zhu Liu, Chunxue Zhang, Youquan Bu, Yunlong Lei, Wang |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Lung Neoplasms DNA damage ATG5 Apoptosis Article Autophagy-Related Protein 5 03 medical and health sciences Transcription (biology) Autophagy Humans Regulation of gene expression Multidisciplinary Chemistry Promoter Sphingolipid Cell biology Gene Expression Regulation Neoplastic 030104 developmental biology A549 Cells Alkaline Ceramidase Tumor Suppressor Protein p53 Reactive Oxygen Species DNA Damage Protein Binding |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | ACER2 is a critical sphingolipid metabolizing enzyme, and has been shown to be remarkably up-regulated following various stimuli such as DNA damage. However, the transcriptional regulatory mechanism of ACER2 gene and its potential role in the regulation of autophagy remain unknown. In this study, we have for the first time identified the human ACER2 gene promoter, and found that human ACER2 transcription is directly regulated by p53 and ACER2 is implicated in the induction of autophagy as well as apoptosis. A series of luciferase reporter assay demonstrated that ACER2 major promoter is located within its first intron where the consensus p53-binding sites exist. Consistently, forced expression of p53 significantly stimulated ACER2 transcription. Notably, p53-mediated autophagy and apoptosis were markedly enhanced by ACER2. Depletion of the essential autophagy gene ATG5 revealed that ACER2-induced autophagy facilitates its effect on apoptosis. Further studies clearly showed that ACER2-mediated autophagy and apoptosis are accompanied by ROS generation. In summary, our present study strongly suggests that ACER2 plays a pivotal role in p53-induced autophagy and apoptosis, and thus might serve as a novel and attractive molecular target for cancer treatment. |
| Databáze: | OpenAIRE |
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