Activation of a Novel c-Myc-miR27-Prohibitin 1 Circuitry in Cholestatic Liver Injury Inhibits Glutathione Synthesis in Mice
| العنوان: | Activation of a Novel c-Myc-miR27-Prohibitin 1 Circuitry in Cholestatic Liver Injury Inhibits Glutathione Synthesis in Mice |
|---|---|
| المؤلفون: | Ting Liu, Shelly C. Lu, Heping Yang, Yu Zhou, María L. Martínez-Chantar, Ebrahim Zandi, José M. Mato, Hui Peng, Tony W.H. Li |
| المصدر: | Antioxidants & Redox Signaling. 22:259-274 |
| بيانات النشر: | Mary Ann Liebert Inc, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Male, Lithocholic acid, NF-E2-Related Factor 2, Physiology, Glutamate-Cysteine Ligase, Clinical Biochemistry, Gene Expression, Cholestasis, Intrahepatic, Biology, environment and public health, digestive system, Biochemistry, Proto-Oncogene Proteins c-myc, chemistry.chemical_compound, In vivo, Cell Line, Tumor, Prohibitins, Gene expression, medicine, Animals, Humans, Prohibitin, Molecular Biology, General Environmental Science, Liver injury, Binding Sites, Base Sequence, GCLM, Cell Biology, Glutathione, respiratory system, medicine.disease, Molecular biology, Antioxidant Response Elements, Mice, Inbred C57BL, Repressor Proteins, MicroRNAs, Original Research Communications, GCLC, chemistry, General Earth and Planetary Sciences, RNA Interference, Protein Binding |
| الوصف: | Aims: We showed that chronic cholestatic liver injury induced the expression of c-Myc but suppressed that of glutamate-cysteine ligase (GCL, composed of catalytic and modifier subunits GCLC and GCLM, respectively). This was associated with reduced nuclear antioxidant response element (ARE) binding by nuclear factor-erythroid 2 related factor 2 (Nrf2). Here, we examined whether c-Myc is involved in this process. Results: Similar to bile duct ligation (BDL), lithocholic acid (LCA) treatment in vivo induced c-Myc but suppressed GCL subunits expression at day 14. Nrf2 expression and Nrf2 ARE binding fell markedly. However, Nrf2 heterodimerization with MafG was enhanced by LCA, which prompted us to examine whether LCA treatment in vivo altered proteins that bind to ARE using biotinylated ARE in pull-down assay followed by proteomics. LCA treatment enhanced c-Myc but lowered prohibitin 1 (PHB1) binding to ARE. This was a result of c-Myc-mediated induction of microRNA 27a/b (miR27a/b), which target both PHB1 and Nrf2 to reduce their expression. Knockdown of c-Myc or miR27a/b attenuated LCA-mediated suppression of Nrf2, PHB1, and GCL subunit expression, whereas overexpression of PHB1 protected against the fall in Nrf2 and GCL subunits. Both c-Myc and PHB1 directly interact with Nrf2 but c-Myc lowers Nrf2 binding to ARE while PHB1 enhances it. Innovation: This is the first work that shows how activation of this circuit in cholestatic liver injury inhibits GCL expression. Conclusions: LCA feeding and BDL activate c-Myc-miR27a/b-PHB1 circuit, with the consequence of inhibiting Nrf2 expression and ARE binding, resulting in decreased reduced glutathione synthesis and antioxidant capacity. Antioxid. Redox Signal. 22, 259–274. |
| تدمد: | 1557-7716 1523-0864 |
| DOI: | 10.1089/ars.2014.6027 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::267a03b8d271b6edbe741d99cbcaa44c https://doi.org/10.1089/ars.2014.6027 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....267a03b8d271b6edbe741d99cbcaa44c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15577716 15230864 |
|---|---|
| DOI: | 10.1089/ars.2014.6027 |