[HTML][HTML] Annexin A1 on the Surface of Early Apoptotic Cells Suppresses CD8+ T Cell Immunity

H Weyd, L Abeler-Dörner, B Linke, A Mahr, V Jahndel… - PLoS …, 2013 - journals.plos.org
H Weyd, L Abeler-Dörner, B Linke, A Mahr, V Jahndel, S Pfrang, M Schnölzer, CS Falk
PLoS One, 2013journals.plos.org
Prevention of an immune response against self-antigens derived from apoptotic cells is
essential to preclude autoimmune and chronic inflammatory diseases. Here, we describe
apoptosis induced externalization of endogenous cytosolic annexin 1 initiating an anti-
inflammatory effector mechanism that suppresses the immune response against antigens of
apoptotic cells. Cytosolic annexin 1 rapidly translocated to the apoptotic cell surface and
inhibited dendritic cell (DC) activation induced by Toll like receptors (TLR). Annexin 1 …
Prevention of an immune response against self-antigens derived from apoptotic cells is essential to preclude autoimmune and chronic inflammatory diseases. Here, we describe apoptosis induced externalization of endogenous cytosolic annexin 1 initiating an anti-inflammatory effector mechanism that suppresses the immune response against antigens of apoptotic cells. Cytosolic annexin 1 rapidly translocated to the apoptotic cell surface and inhibited dendritic cell (DC) activation induced by Toll like receptors (TLR). Annexin 1-inhibited DC showed strongly reduced secretion of pro-inflammatory cytokines (e.g. TNF and IL-12) and costimulatory surface molecules (e.g. CD40 and CD86), while anti-inflammatory mediators like PD-L1 remained unchanged. T cells stimulated by such DC lacked secretion of interferon-γ (IFN-γ) and TNF but retained IL-10 secretion. In mice, annexin 1 prevented the development of inflammatory DC and suppressed the cellular immune response against the model antigen ovalbumin (OVA) expressed in apoptotic cells. Furthermore, annexin 1 on apoptotic cells compromised OVA-specific tumor vaccination and impaired rejection of an OVA-expressing tumor. Thus, our results provide a molecular mechanism for the suppressive activity of apoptotic cells on the immune response towards apoptotic cell-derived self-antigens. This process may play an important role in prevention of autoimmune diseases and of the immune response against cancer.
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