期刊
FISH & SHELLFISH IMMUNOLOGY
卷 115, 期 -, 页码 27-34出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fsi.2021.05.018
关键词
TLR1; Turbot; Vibrio anguillarum; Edwardsiella tarda; Innate immune
资金
- Young Experts of Taishan Scholars [tsqn201909130]
- Science and Technology Support Plan for Youth Innovation of Colleges and Universities in Shandong Province [2019KJF003]
- First class fishery discipline program in Shandong Province, China
TLR1 in turbot was characterized, showing wide expression in healthy tissues, strongest in spleen and head-kidney; strong responses to LPS in challenge experiments, varied responses to other pathogen-associated molecular patterns; subcellularly distributed in cytoplasm, membrane, and nucleus.
TLRs are the first and best-characterized pattern recognition receptors conserved across all the species. Different from mammals, the TLRs in teleost fishes are very diversified due to various evolutionary mechanisms. Here, we characterized one TLR1 gene in turbot, with a 2,415 bp open reading frame (ORF), that encoding 804 amino acid residues, and have the highest similarity and identity both to Paralichthys olivaceus with 88.9% and 79.9%. In phylogenetic analysis, it was firstly clustered with P. olivaceus, and then clustered with Takifugu rubripes. TLR1 was widely expressed in all the examined healthy tissues with the highest expression level in spleen, followed by head-kidney. In addition, it was significantly regulated in gill, skin and intestine following Edwardsiella tarda and Vibrio anguillarum challenge with different expression patterns. In in vitro stimulation with pathogen-associated molecular patterns, TLR1 showed significantly strong and elevated responses to LPS, but only responded to LTA and Poly(I:C) at the highest evaluated concentration, while no response was detected using PGN stimulation. Moreover, in subcellular localization analysis, TLR1 was distributed in the cytoplasm, membrane and nucleus. Taken together, TLR1 played vital roles for host immune response to bacterial infection, only with strong binding ability to LPS and involved in the production of inflammatory cytokines. However, the specific ligand for TLR1 and its functional association with other TLRs should be further characterized in fish species.
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