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Identification of a novel CCR7 gene in rainbow trout with differential regulation in the context of mucosal or systemic infection Public Deposited

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  • Identification of a novel CCR7 gene in rainbow trout with differential expression in the context of mucosal or systemic infection
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  • In mammals, CCR7 is the chemokine receptor for the CCL19 and CCL21 chemokines, molecules with a major role in the recruitment of lymphocytes to lymph nodes and Peyer´s patches in the intestinal mucosa, especially naïve T lymphocytes. In the current work, we have identified a CCR7 homologue in rainbow trout (Oncorhynchus mykiss) that shares many of the conserved features of mammalian CCR7. The receptor is constitutively transcribed in the gills, hindgut, spleen, thymus and gonad. When leukocyte populations were isolated, IgM⁺ cells, T cells and myeloid cells from head kidney transcribed the CCR7 gene. In blood, IgM⁺ and IgT⁺ B cells but not T lymphocytes were transcribing CCR7, whereas in the spleen, CCR7 mRNA expression was strongly detected in T lymphocytes. In response to infection with viral hemorrhagic septicemia virus (VHSV), CCR7 transcription was down-regulated in spleen and head kidney upon intraperitoneal infection, whereas upon bath infection, CCR7 was up-regulated in gills but remained undetected in the fin bases, the main site of virus entry. Concerning its regulation in the intestinal mucosa, the ex vivo stimulation of hindgut segments with Poly I:C or inactivated bacteria significantly increased CCR7 transcription, while in the context of an infection with Ceratomyxa shasta, the levels of transcription of CCR7 in both IgM⁺ and IgT⁺ cells from the gut were dramatically increased. All these data suggest that CCR7 plays an important role in lymphocyte trafficking during rainbow trout infections, in which CCR7 appears to be implicated in the recruitment of lymphocytes to mucosal tissues such as gills or intestine.
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  • Ordás, M. C., Castro, R., Dixon, B., Sunyer, J. O., Bjork, S., Bartholomew, J., ... Tafalla, C. (2012). Identification of a novel CCR7 gene in rainbow trout with differential expression in the context of mucosal or systemic infection. Developmental and Comparative Immunology, 38(2), 302-311. doi: 10.1016/j.dci.2012.07.001
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  • This work was supported by the Starting Grant 2011 (Project No.: 280469) from the European Research Council and the AGL2011-29676 project from the Spanish Ministry of Economy and Competitiveness (Plan Nacional AGL2011-29676).
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