期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 218, 期 -, 页码 878-890出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2022.07.201
关键词
Nile tilapia ( Oreochromis niloticus ); TLR3; MyD88 and TRIF adaptor
资金
- National Key Research and Development Programme of China [2018YFD0900302]
- Agriculture Research System of China of MOF and MARA [CARS-46]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010883, 2021A1515010852]
OnTLR3 is broadly expressed in Nile tilapia and plays an important role in immune response, serving as a pattern recognition receptor in pathogen invasion.
TLR3 plays a crucial role in innate immunity. In the present study, OnTLR3 was identified in the Nile tilapia Oreochromis niloticus, with a conserved LRR domain and a C-terminal TIR domain. OnTLR3 was broadly expressed in all tissues tested, with the highest expression levels in the blood and the lowest in the kidney. TLR3 mRNA could be detected from pharyngula (2.5 dpf) to late larva (8.5 dpf) during embryonic and larval development. Moreover, the expression level of OnTLR3 was clearly altered in all five tissues after Streptococcus agalactiae infection in vivo and could be induced by LPS, poly(I:C), S. agalactiae WC1535 and delta CPS in Nile tilapia macrophages. When OnTLR3 was overexpressed in 293 T cells, it was distributed in the cytoplasm and could significantly increase NF-kappa B activation. The pulldown assays showed that OnTLR3 interacted with both OnMyD88 and OnTRIF. The binding assays revealed the specificity of OnTLR3 for pathogen-associated molecular patterns (PAMPs) and bacteria that included S. agalactiae, Aeromonas hydrophila and poly(I:C), LPS and PGN. Taken together, these findings suggest that OnTLR3, as a pattern recognition receptor (PRR), might play an important role in the immune response to pathogen invasion.
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