Core 2 O-glycan synthesis is stimulated by IL-15 signaling.

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Core 2 O-glycan synthesis is stimulated by IL-15 signaling. Core 2 O-glycan synthesis is stimulated by IL-15 signaling. (A) Memory P14 CD8+ T cells were purified and stimulated with IL-15 (250 ng/ml) or IL-15 + 5 mM BADG for 3 days. Binding of E- and P-selectin chimeric proteins was quantified. (B) Same as (A), except after IL-15 stimulation, memory P14 CD8+ T cells were treated with neuraminidase before analyzing E- and P-selectin binding. (C) The synthesis of complex core 2 O-glycans requires the collective action of a number of glycosyltransferases. (D) Memory P14 CD8+ T cells were purified and stimulated in vitro with IL-15 (500 ng/ml) for 3 days. Changes in gene expression of Gcnt1, B3gnt3, B4galt5, St3gal4, Fut7, and St3gal1 were determined by quantitative polymerase chain reaction. (E) St3gal1 caps the core 1 O-glycan substrate with α2,3-linked sialic acid, which prevents core 2 O-glycan synthesis (by Gcnt1) and can be detected with the lectin MAL II. PNA binds to core 1 O-glycans only if they do not contain an α2,3-linked sialic acid. (F) Memory P14 CD8+ T cells were stimulated as in (A), and binding of MAL II, PNA, or the 1B11 antibody was analyzed. (G) LCMV-immune mice (90 days after infection) were given control IgG or IL-15–neutralizing antibody for 10 days. PBL, peripheral blood lymphocyte. The frequency, E-selectin binding (H), and P-selectin binding (I) of the memory P14 CD8+ T cell population in the circulation were quantified. (J) Mice from (G) to (I) were infected with VacV, and memory P14 CD8+ T cells were quantified in the skin on day 3 after VacV infection. Jossef F. Osborn et al. Sci. Immunol. 2017;2:eaan6049 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works