CD62L defines a subset of pathogen-specific bovine CD4 with central memory cell characteristics
Central memory T cells (Tcm) have not previously been characterized in cattle and any other ruminant species. Here we described two phenotypically and functionally different subsets of pathogen-specific memory CD4+ T cells in cattle that survived infection with Mycoplasma mycoides subsp. mycoides small colony (MmmSC). The first subset is CD45RO+CD45R_CD62L_ and comprises two thirds of IFN-g producing CD4+ T cells after MmmSC recall stimulation. The second is CD45RO+CD45R_CD62L+ and represents the majority of proliferating CD4+ T cells after 7 days of stimulation. Cell sorting experiments confirmed that both CD4+CD62L+ and CD4+CD62L_ subsets are present in vivo and proliferate independently in recall responses to MmmSC. In addition, MmmSC stimulation strongly decreased CCR7 and increased CCR5 transcripts levels in CD4+CD62L_ cells whereas CD4+CD62L+ were only slightly affected. High levels of recall proliferation but low IFN-g production, together with the capacity to preferentially migrate through the lymph nodes (i.e., expression of CD62L and CCR7), are characteristics of Tcm, in humans and mice. Tcm are associated with long-term protective immunity and a privileged target for vaccine development. Our results demonstrate the existence of Tcm in cattle and suggest that CD62L may serve as a marker to monitor Tcm in infections and vaccine development studies in ruminant.
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | L73 - Maladies des animaux, L52 - Physiologie animale - Croissance et développement, Mycoplasma mycoides, ruminant, bovin, cellule, relation hôte pathogène, prolifération des tissus, cytologie, épidémiologie, contrôle de maladies, http://aims.fao.org/aos/agrovoc/c_23951, http://aims.fao.org/aos/agrovoc/c_6695, http://aims.fao.org/aos/agrovoc/c_1391, http://aims.fao.org/aos/agrovoc/c_1418, http://aims.fao.org/aos/agrovoc/c_34017, http://aims.fao.org/aos/agrovoc/c_37411, http://aims.fao.org/aos/agrovoc/c_2091, http://aims.fao.org/aos/agrovoc/c_2615, http://aims.fao.org/aos/agrovoc/c_2327, |
| Online Access: | http://agritrop.cirad.fr/552767/ http://agritrop.cirad.fr/552767/1/document_552767.pdf |
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