Dexamethasone induces aberrant macrophage immune function and apoptosis
| Autor: | Jie Lin, Bin Liu, Guohua Zhao, Ai Fulu, Wu Lv |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Lipopolysaccharides Cancer Research Kruppel-Like Transcription Factors dexamethasone Proinflammatory cytokine Cell Line 03 medical and health sciences Mice 0302 clinical medicine Immune system medicine Macrophage Animals Humans Prostaglandin E2 immunosuppression glucocorticoids Chemistry Macrophages apoptosis KLF9 General Medicine Articles Hep G2 Cells Cell cycle COX-2 Coculture Techniques Gene Expression Regulation Neoplastic 030104 developmental biology RAW 264.7 Cells Oncology Apoptosis 030220 oncology & carcinogenesis Gene Knockdown Techniques Cancer research Cytokine secretion Reactive Oxygen Species medicine.drug |
| Zdroj: | Oncology Reports |
| ISSN: | 1791-2431 1021-335X |
| Popis: | Glucocorticoids (GCs) are known potent clinical drugs, however, their mode of action is still complex and debatable. Macrophages are the most important target of GCs and play a key role in tumor immunity in vivo, but their relationship is also controversial. In the present study, the lentivirus system was used to overexpress and knock down the level of transcription factor Kruppel‑like factor 9 (KLF9). The results revealed that dexamethasone (Dex) induced ROS generation and mitochondria‑dependent apoptosis in RAW 264.7 cells via the KLF9. In addition, overexpression of KLF9 significantly increased apoptosis of RAW 264.7 cells. Notably, ELISA assay revealed that increased expression of KLF9 inhibited LPS‑induced COX‑2 expression and reduced COX‑2‑derived prostaglandin E2 and pro‑inflammatory cytokine secretion. Furthermore, a co‑culture system was used to reveal that overexpression of KLF9 in RAW 264.7 cells promoted HepG2 cell survival. In summary, it is reported that KLF9 promoted apoptosis of proinflammatory macrophages, and suppressed the antitumor effects, which can be selectively targeted by GCs as a novel mechanism to suppress antineoplastic activity. |
| Databáze: | OpenAIRE |
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