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Fish soluble Toll-like receptor 5 (TLR5S) is an acute-phase protein with integral flagellin-recognition activity

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From an EST fragment of the rainbow trout that was predicted to contain leucine-rich repeats (LRR), we cloned the whole cDNA and identified a soluble form of TLR5 ortholog (rtTLR5S), which does not exist in the mouse and human. rtTLR5S was about 38% homologous to the extracellular domains of human (hu) and mouse (mo)TLR5, while rtTLR5S showed <25% homologous to those of other human or mouse TLRs. A chimera constructed of rtTLR5S and the intra-cellular TIR of huTLR5 expressed on HeLa cells signaled the presence of flagellin A and C from V. anguillarum, resulting in NF-κB activation. The mRNA of rtTLR5S was predominantly detected in the liver. The hepatoma cell line of the rainbow trout RTH149 that responded to flagellin, allowed to up-regulate rtTLR5S in response to V. anguillarum or its purified flagellin within 8 h. rtTLR5S, when co-expressed with membrane huTLR5 in HeLa cells, augmented huTLR5-mediated NF-κB activation in response to flagellin. These results, together with the genome information of the pufferfish Fugu (Fugu rubripes), suggest that in fish the soluble TLR5 is an acute-phase protein sensing bacterial infection via recognition of a variety of bacterial flagellins to augment NF-κB activation, and may be important for fish to survive from bacterial infection in the water.
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Document Type: Research Article

Affiliations: Department of Immunology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Higashinari-ku, Osaka 537-8511, Japan

Publication date: March 1, 2005

More about this publication?
  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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