Upregulation of mitochondrial ferritin by proinflammatory cytokines: implications for a role in Alzheimer's disease
| Autor: | Ziyi Liu, Steven R. Vincent, Hongkuan Yang, Mingchun Yang, Hongpeng Guan, Daijiro Yanagisawa, Ikuo Tooyama, Shiguang Zhao, Shigeko Takeuchi |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Time Factors
Inflammation Apoptosis Biology Transfection Proinflammatory cytokine Cell Line Mitochondrial Proteins chemistry.chemical_compound Downregulation and upregulation Nitriles medicine Aspartic Acid Endopeptidases Humans RNA Messenger Sulfones Cycloheximide RNA Small Interfering Interleukin 6 Protein Synthesis Inhibitors Gene knockdown Amyloid beta-Peptides Dose-Response Relationship Drug General Neuroscience MITOCHONDRIAL FERRITIN NF-kappa B Transcription Factor RelA NF-κB General Medicine Cell biology Up-Regulation Psychiatry and Mental health Clinical Psychology chemistry Immunology Ferritins biology.protein Cytokines Tumor necrosis factor alpha Geriatrics and Gerontology medicine.symptom Amyloid Precursor Protein Secretases Oxidoreductases |
| Zdroj: | Journal of Alzheimer's disease : JAD. 45(3) |
| ISSN: | 1875-8908 |
| Popis: | Studies have shown an increased expression of mitochondrial ferritin (FtMt) and an antioxidant role for the protein in the brains of Alzheimer's disease (AD) patients. However, little information is available concerning the role of FtMt in other AD pathologies, including inflammation and amyloidogenesis. Therefore, we investigated the regulation and function of FtMt in inflammation and amyloidogenesis. FtMt protein expression was increased by proinflammatory cytokines, including tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and interleukin 6 (IL-6), whereas FtMt mRNA levels were increased by TNF-α but not by IL-1β or IL-6 in IMR-32 cells. The transcription factor nuclear factor-κB (NF-κB) inhibitor, Bay 11-7082, suppressed this TNF-α-induced FtMt expression. FtMt overexpression increased NF-κB activity and translocation of p65 into the nucleus in HEK293 cells. Conversely, knockdown of FtMt attenuated TNF-α-induced NF-κB activity. Overexpression of FtMt inhibited TNF-α-induced apoptosis in the cell culture. FtMt overexpression reduced iron-mediated expression of amyloid-β protein precursor and decreased NF-κB-dependent increases in β- and γ-secretase, leading to decreased amyloid-β production. Our data provide new insights into the mechanism underlying the regulation of FtMt expression by proinflammatory cytokines and indicate further roles for FtMt in AD. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|