Loss of QKI in macrophage aggravates inflammatory bowel disease through amplified ROS signaling and microbiota disproportion
| Autor: | Li Wang, Ke Xue, Zicheng Ye, Dongsheng Zhai, Yongquan Bai, Zifan Lu, Di Qu, Lele Deng, An Xiang, Guo Chen, Tianshu Du, Wenwen Wang, Yi Zhao, Lirong Ma |
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| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
Cancer Research Immunology RNA-binding protein Biology medicine.disease_cause lcsh:RC254-282 digestive system Inflammatory bowel disease Article Small hairpin RNA 03 medical and health sciences Cellular and Molecular Neuroscience 0302 clinical medicine medicine Macrophage lcsh:QH573-671 Messenger RNA lcsh:Cytology Cell Biology lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens RNA modification medicine.disease Phenotype KEAP1 030104 developmental biology 030220 oncology & carcinogenesis Cancer research Oxidative stress |
| Zdroj: | Cell Death Discovery Cell Death Discovery, Vol 7, Iss 1, Pp 1-17 (2021) |
| ISSN: | 2058-7716 |
| Popis: | Inflammatory bowel disease (IBD) is a refractory chronic inflammatory illness of the gastrointestinal (GI) tract. Macrophage exerts an important role in IBD development. QKI, as an RNA binding protein, was related with inflammatory responses in bacterial infections by regulating the polarization of macrophages. Therefore, we suspected that QKI-regulated macrophages have the potential to play a certain role in IBD and the underlying mechanism. Our results demonstrated that the mice with macrophage-specific deletion of QKI induced with dextran sodium sulfate (DSS) are more susceptible to IBD development, exhibited a severe leaky gut barrier phenotype and higher intense oxidative stress, which are rescued by treating with butylated hydroxyanisole (BHA), an agonist of NRF2. Mechanically, we observed that Keap1 mRNA in the nucleus was exported to the cytoplasm after LPS stimuli in parallel with QKI reductions, and the removal of QKI by shRNA facilitated Keap1 mRNA nuclear exporting and expression in cytoplasm, consequently NRF2 activation in nucleus was weakened, and led to the impaired antioxidant abilities. In addition, mice models of fecal microbiota transplant (FMT) and the co-culturing of mice epithelia cells with feces derived from the DSS-treated QKI-deficit mice revealed consistently aggravated colitis along with a severe oxidative stress; 16S sequencing analysis substantiated the altered compositions of commensal bacteria too. Overall, the current study represents the first effort to explore the anti-oxidant role of QKI in the intestinal macrophage via post-transcriptional regulation of Keap1 mRNA localization and the relevant NRF2 antioxidant signaling, and the disproportional changes in the microbiota were attributable to the mediation of pathogenic damage in the IBD development of QKI-deficit mice. |
| Databáze: | OpenAIRE |
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