Sialic Acid Ligands of CD28 Suppress Costimulation of T Cells.

Sialic Acid Ligands of CD28 Suppress Costimulation of T Cells.
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DOI:
10.1021/acscentsci.1c00525
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发表时间:
2021-09-22
影响因子:
18.2
通讯作者:
Paulson JC
Paulson JC
中科院分区:
化学1区
文献类型:
--
作者:
Edgar LJ;Thompson AJ;Vartabedian VF;Kikuchi C;Woehl JL;Teijaro JR;Paulson JC

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Effector T cells comprise the cellular arm of the adaptive immune system and are essential for mounting immune responses against pathogens and cancer. To reach effector status, costimulation through CD28 is required. Here, we report that sialic acid-containing glycans on the surface of both T cells and APCs are alternative ligands of CD28 that compete with binding to its well-documented activatory ligand CD80 on the APC, resulting in attenuated costimulation. Removal of sialic acids enhances antigen-mediated activation of naïve T cells and also increases the revival of effector T cells made hypofunctional or exhausted via chronic viral infection. This occurs through a mechanism that is synergistic with antibody blockade of the inhibitory PD-1 axis. These results reveal a previously unrecognized role of sialic acid ligands in attenuation of CD28-mediated costimulation of T cells. T cells require multiple signals to activate, including costimulation via CD28. We report that sialoglycans are alternative ligands for CD28 and attenuate costimulation by competing with CD80.
T细胞共刺激和共抑制的分子机制。
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