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Immunol."],"abstract":"<jats:p>Toxoplasmosis is a worldwide parasitosis that is usually asymptomatic; cell-mediated immunity, particularly T cells, is a crucial mediator of the immune response against this parasite. Membrane protein expression has been studied for a long time in T lymphocytes, providing vital information to determine functional checkpoints. However, less is known about the role of post-translational modifications in T cell function. Glycosylation plays essential roles during maturation and function; particularly, sialic acid modulation is determinant for accurate T cell regulation of processes like adhesion, cell-cell communication, and apoptosis induction. Despite its importance, the role of T cell sialylation during infection remains unclear. Herein, we aimed to evaluate whether different membrane sialylation motifs are modified in T cells during acute <jats:italic>Toxoplasma gondii<\/jats:italic> infection using different lectins. To this end, BALB\/c Foxp3<jats:sup>EGFP<\/jats:sup> mice were infected with <jats:italic>T. gondii<\/jats:italic>, and on days 3, 7, and 10 post-infection, splenocytes were obtained to analyze conventional (Foxp3<jats:sup>-<\/jats:sup>) CD4<jats:sup>+<\/jats:sup> and CD8<jats:sup>+<\/jats:sup> populations by flow cytometry. Among the different lectins used for analysis, only <jats:italic>Sambucus nigra<\/jats:italic> lectin, which detects sialic acid \u03b12,6 linkages, revealed two distinctive populations (SN<jats:sup>Bright<\/jats:sup> and SN<jats:sup>-\/Dim<\/jats:sup>) after infection. Further characterization of CD4<jats:sup>+<\/jats:sup> and CD8<jats:sup>+<\/jats:sup> SN<jats:sup>-\/Dim<\/jats:sup> lymphocytes showed that these are highly activated cells, with a TEf\/EM or TCM phenotype that produce high IFN-\u03b3 levels, a previously undescribed cell state. This work demonstrates that glycan membrane analysis in T cells reveals previously overlooked functional states by evaluating only protein expression.<\/jats:p>","DOI":"10.3389\/fimmu.2024.1429302","type":"journal-article","created":{"date-parts":[[2024,8,26]],"date-time":"2024-08-26T05:04:21Z","timestamp":1724648661000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["\u03b12,6 sialylation distinguishes a novel active state in CD4+ and CD8+ cells during acute Toxoplasma gondii 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