[No authors listed]
Dendritic cell inhibitory receptor 1 (DCIR1, also known as DCIR and Clec4a2) and dendritic cell activating receptor 2 (DCAR2, also known as DCAR and Clec4b1) are mouse lectin receptors expressed on antigen presenting cells. They have structurally similar C-type lectin domains, of which amino acid sequences show 90.5% identity, and commercially available antibodies against them cross-react each other. Here we have established novel antibodies against DCIR1 and DCAR2 that can unambiguously discriminate DCIR1 and DCAR2 and examined their distribution among various immune cells. While DCIR1 was ubiquitously expressed on myeloid cells, including conventional DCs (cDCs), macrophages, neutrophils and eosinophils, in various immune organs, significant expression of DCAR2 was detected only on subpopulations of cDCs from bone marrow and skin-draining lymph nodes. Interestingly, in FITC-painted mice, DCAR2 was expressed on all of the FITC(+) cDCs, which had migrated from the skin after FITC painting, suggesting that DCAR2 can be a marker of migratory cDCs in skin-draining lymph nodes. Our findings provide a basis to investigate in vivo function of DCIR1 and DCAR2.
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