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Dendritic cells (DCs) comprise several subsets that are critically involved in the initiation and regulation of immunity. Clec4A4/DC immunoreceptor 2 (DCIR2) is a C-type lectin receptor (CLR) exclusively expressed on CD8α −  conventional DCs (cDCs). However, how Clec4A4 controls immune responses through regulation of the function of CD8α −  cDCs remains unclear. Here we show that Clec4A4 is a regulatory receptor for the activation of CD8α −  cDCs that impairs inflammation and T-cell immunity.  Clec4a4  −/− CD8α −  cDCs show enhanced cytokine production and T-cell priming following Toll-like receptor (TLR)-mediated activation. Furthermore,  Clec4a4  −/−  mice exhibit TLR-mediated hyperinflammation. On antigenic immunization,  Clec4a4  −/−  mice show not only augmented T-cell responses but also progressive autoimmune pathogenesis. Conversely,  Clec4a4  −/−  mice exhibit resistance to microbial infection, accompanied by enhanced T-cell responses against microbes. Thus, our findings highlight roles of Clec4A4 in regulation of the function of CD8α −  cDCs for control of the magnitude and quality of immune response.

Clec4A4 is a regulatory receptor for dendritic cells that impairs inflammation and T-cell immunity