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Chen S, Jin P, Chen H, Wu D, Li S, Zhang Y, Liu Q, Yang D. Dual function of a turbot inflammatory caspase in mediating both canonical and non-canonical inflammasome activation. Dev Comp Immunol 2021; 121:104078. [PMID: 33794278 DOI: 10.1016/j.dci.2021.104078] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 03/20/2021] [Accepted: 03/20/2021] [Indexed: 06/12/2023]
Abstract
Host protective inflammatory caspase activity must be tightly regulated to prevent pathogens infection, however, the inflammatory caspase-engaged inflammasome activation in teleost fish remains largely unknown. In this study, we reveal a bifurcated evolutionary role of the inflammatory caspase in mediating both non-canonical and canonical inflammasome pathways in teleost fish. Through characterization of a unique inflammatory SmCaspase from the teleost Scophthalmus maximus (turbot), we found it can directly recognize cytosolic lipopolysaccharide (LPS) via its N-terminal CARD domain, resulting in caspase-5-like proteolytic enzyme activity-mediated pyroptosis in Turbot Muscle Fibroblasts. Interestingly, we also found that this inflammatory caspase can be recruited to SmNLRP3-SmASC to form the NLRP3 inflammasome complex, engaging the SmIL-1β release in Head Kidney-derived Macrophages. Consequently, the SmCaspase activation can recognize and cleave the SmGSDMEb to release its N-terminal domain, mediating both pyroptosis and bactericidal activities. Furthermore, the SmCaspase-SmGSDMEb axis-gated pyroptosis governs the bacterial clearance and epithelial desquamation in fish gill filaments in vivo. To our knowledge, this study is the first to identify an inflammatory caspase acting as a central coordinator in NLRP3 inflammasome, as well as a cytosolic LPS receptor; thus uncovering a previously unrecognized function of inflammatory caspase in turbot innate immunity.
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Affiliation(s)
- Shouwen Chen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Peng Jin
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Hao Chen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Di Wu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Shuxin Li
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Yuanxing Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China; Shanghai Engineering Research Center of Marine Cultured Animal Vaccines, Shanghai, 200237, China
| | - Qin Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Engineering Research Center of Marine Cultured Animal Vaccines, Shanghai, 200237, China
| | - Dahai Yang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Engineering Research Center of Marine Cultured Animal Vaccines, Shanghai, 200237, China.
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