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Skin deep: Unconventional autophagy eats away TNF-driven skin inflammation
Ying Feng1, Francis Ka-Ming Chan1
1Liangzhu Laboratory, Department of Cardiology, Heart Regeneration and Repair Key Laboratory of Zhejiang Province, Transvascular Implantation Devices Research Institute, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China.
Autophagy, regulated by ATG9A, suppresses skin inflammation by inhibiting STING activation and Z-DNA binding protein 1 (ZBP1)-dependent cell death, revealing a novel anti-inflammatory mechanism.
Area of Science:
- Immunology
- Cellular Biology
- Molecular Biology
Background:
- Tumor necrosis factor (TNF) and type I interferons (IFNs) are key inflammatory mediators.
- Autophagy is a cellular degradation process with roles in immunity.
- The interplay between autophagy, TNF, IFNs, and inflammation remains poorly understood.
Purpose of the Study:
- To investigate the role of autophagy in regulating skin inflammation.
- To elucidate the molecular mechanisms by which autophagy influences inflammatory pathways.
- To explore the connection between autophagy, STING activation, and ZBP1-dependent cell death.
Main Methods:
- Utilized genetic models to study autophagy-deficient cells and tissues.
- Investigated the impact of ATG9A on STING signaling pathways.
- Assessed Z-DNA binding protein 1 (ZBP1)-dependent cell death in inflammatory conditions.
Main Results:
- ATG9A-mediated autophagy was found to suppress skin inflammation.
- Autophagy activation inhibited STING (Stimulator of Interferon Genes) activation.
- Suppression of ZBP1-dependent cell death was observed with ATG9A-mediated autophagy.
Conclusions:
- Autophagy acts as a crucial regulator of skin inflammation.
- ATG9A-mediated autophagy restrains inflammation by dampening STING signaling.
- This pathway provides a novel mechanism for controlling ZBP1-dependent cell death during inflammation.
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