DataSheet_1_Fas/FasL Signaling Regulates CD8 Expression During Exposure to Self-Antigens.pdf (499.87 kB)
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DataSheet_1_Fas/FasL Signaling Regulates CD8 Expression During Exposure to Self-Antigens.pdf

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posted on 24.03.2021, 04:45 authored by Giovanna Flores-Mendoza, Noé Rodríguez-Rodríguez, Rosa M. Rubio, Iris K. Madera-Salcedo, Florencia Rosetti, José C. Crispín

Activation of self-reactive CD8+ T cells induces a peripheral tolerance mechanism that involves loss of CD8 expression. Because genetic deficiency of Fas and Fasl causes the accumulation of double-negative (DN; CD3+ TCR-αβ+ CD4- CD8-) T cells that have been proposed to derive from CD8+ cells, we decided to explore the role of Fas and FasL in self-antigen-induced CD8 downregulation. To this end, we quantified Fas and FasL induction by different stimuli and analyzed the effects of Fas/FasL deficiency during a protective immune response and after exposure to self-antigens. Our data describes how Fas and FasL upregulation differs depending on the setting of CD8 T cell activation and demonstrates that Fas/FasL signaling maintains CD8 expression during repetitive antigen stimulation and following self-antigen encounter. Together, our results reveal an unexpected role of Fas/FasL signaling and offer a new insight into the role of these molecules in the regulation of immune tolerance.

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