O-Glycosylation of NnTreg Lymphocytes Recognized by the Amaranthus leucocarpus Lectin

Abstract EN

O-glycosidically-linked glycans have been involved in development, maturation, homing, and immune regulation in T cells.

Previous reports indicate that Amaranthus leucocarpus lectin (ALL), specific for glycans containing galactose-N-acetylgalactosamine and N-acetylgalactosamine, recognizes human naïve CD27+CD25+CD4+ T cells.

Our aim was to evaluate the phenotype of CD4+ T cells recognized by ALL in peripheral blood mononuclear cells obtained from healthy volunteers.

CD4+ T cells were isolated by negative selection using magnetic beads-labeled monoclonal antibodies; the expression of T regulatory cell phenotypic markers was assessed on ALL-recognized cells.

In addition, IL-4, IL-10, IFN-γ, and TGF-β intracellular production in ALL+ cells was also evaluated.

The analyses of phenotypic markers and intracellular cytokines were performed through flow cytometry.

ALL-recognized CD4+ T cells were mainly CD45RA+, CCR7+ cells.

Although 52±10% CD25+Foxp3+ cells were positive to ALL, only 34±4% of ALL+ cells corresponded to CD25+Foxp3− cells.

Intracellular cytokines in freshly obtained ALL+CD4+ T cells exhibited 8% of IL-4, 15% of IL-10, 2% of IFN-γ, and 15% of TGF-β, whereas ALL−CD4+ T cells depicted 1% of IL-4, 2% of IL-10, <1% of IFN-γ, and 6% of TGF-β.

Our results show that galactose-N-acetylgalactosamine and N-galactosamine-bearing CD4+ T cells expressed phenotypic markers of NnTreg cells.