A transmembrane C-type lectin receptor mediates LECT2 effects on head kidney-derived monocytes/macrophages in a teleost, Plecoglossus altivelis

Fish & Shellfish Immunology
Hai-Ling MaJiong Chen

Abstract

Leukocyte cell-derived chemotaxin 2 (LECT2) is a multifunctional cytokine involved in many diseases in which immune dysfunction is present. Ayu LECT2 (PaLECT2), which interacts with a C-type lectin receptor (PaCLR), was shown to activate ayu head kidney-derived monocytes/macrophages (MO/MΦ) to improve the outcomes of fish upon bacterial infections. However, it is not known if PaCLR mediates PaLECT2 effects on ayu MO/MΦ. In this study, we determined the role of PaCLR in signal transduction of PaLECT2 on ayu MO/MΦ. We expressed the PaCLR ectodomain in Escherichia coli and produced a refolded recombinant protein (rPaCLR) that was then used to produce the anti-PaCLR IgG (anti-PaCLR) for neutralization. Addition of the refolded PaLECT2 mature peptide (rPaLECT2m) to ayu MO/MΦ cultures, increased cytokine expression, induced chemotaxis, and enhanced phagocytosis and bactericidal activity of these cells were observed. When we added anti-PaCLR to block the ectodomain of PaCLR, these effects were significantly inhibited. Based on our previous works and the data presented here, we conclude that PaCLR mediates the immunomodulatory effects of PaLECT2 on ayu MO/MΦ, thus defining a mechanism by which LECT2 protects fish against pathogens.

References

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Feb 23, 2013·Fish & Shellfish Immunology·Xin-Jiang LuYu-Hong Shi
Oct 12, 2013·Hepatology : Official Journal of the American Association for the Study of Liver Diseases·Chi-Kuan ChenMin-Liang Kuo
Dec 3, 2014·Fish & Shellfish Immunology·Jiong ChenChang-Hong Li

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Citations

May 29, 2016·Fish & Shellfish Immunology·Shen-Xue ChenJiong Chen
May 4, 2017·Clinical and Translational Science·V Slowik, U Apte

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