Abstract
Nod-like receptor pyrin domain-containing protein 3 (NLRP3) is a crucial member of NLRs family, which plays an important role in host defense. However, knowledge about inflammation response of NLRP3 in fish was scarce. Herein, a novel NLRP3 homologue (designated as CaNLRP3-like) was identified in Qihe crucian carp Carassius auratus. Full-length cDNA of CaNLRP3-like was composed of 3898 bp, which contained a 3093-bp open reading frame encoding. Structural analysis revealed that CaNLRP3-like lacked the PYD domain at N-terminus. Multiple sequence alignment and phylogenetic analysis revealed that CaNLRP3-like showed the high identity with the fishes in Cyprinidae, distinct from the branch formed by the mammals. Spatial expression analysis revealed that CaNLRP3-like was expressed in all examined tissues, with the highest expression levels in gill. Immune challenge experiments revealed that the expression of CaNLRP3-like was significantly up-regulated in six tissues in cases of challenge with Aeromonas hydrophila, LPS, and polyI:C. The recombined protein of CaNLRP3-like with 3Flag-tag was observed obviously in the cytoplasm. Furthermore, knockdown of CaNLRP3-like reduced the mRNA level of IL-1β, and increased the bacterial loading in liver, spleen, and head kidney. Vice versa, overexpression of CaNLRP3-like increased the mRNA expression of IL-1β, and decreased the bacterial loading in three detected tissues. Taken together, CaNLRP3-like gene, as a NLRP3 homologue, was identified and characterized in C. auratus, and these results revealed its role in regulating IL-1β expression and restricting bacterial infection in vivo, which shed light on the potential of CaNLRP3-like as a therapeutic target upon bacterial infection in teleost fish.
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The data that support the findings of this study are available from the corresponding author but restrictions apply to the availability of these data, which were used under license for the current study, and so are not publicly available. Data are however available from the authors upon reasonable request and with permission of participating local authority areas.
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This research was supported by the National Natural Science Foundation of China (U2004154).
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Juan Sun and Xianghui Kong wrote the manuscript, Xianliang Zhao and Chao Pei performed experiments and data analysis, Lei Zhu interpreted the data, and Xianliang Zhao, Jie Zhang, and Xianghui Kong conceptualized and designed the project.
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The study was performed in strict compliance with the recommendations set forth in the Animal Ethics Procedures and Guidelines of the People’s Republic of China. All animal protocols were approved by the Animal Administration and Ethics Committee of Henan Normal University.
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Sun, J., Zhao, X., Pei, C. et al. A novel NLRP3 homologue lacking the PYD domain activates IL-1β expression and promotes the bacterial elimination in Qihe crucian carp Carassius auratus. Aquacult Int 32, 1135–1150 (2024). https://doi.org/10.1007/s10499-023-01209-1
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DOI: https://doi.org/10.1007/s10499-023-01209-1