Antigen Description
Human PILRA, is a novel member of the Ig superfamily expressed as a monomeric 44 kDa transmembrane glycoprotein and containing a single extracellular V-set Ig-like domain. Two potential secreted isoforms were also identified. FDF03 was mostly detected in hemopoietic tissues and was expressed by monocytes, macrophages, and granulocytes, but not by lymphocytes (B, T, and NK cells), indicating an expression restricted to the myelomonocytic lineage. FDF03 was also strongly expressed by monocyte-derived dendritic cells (moDC) and preferentially by CD14+/CD1a- DC derived from CD34+ progenitors. Moreover, flow cytometric analysis showed FDF03 expression by CD11c+ blood and tonsil DC, but not by CD11c- DC precursors. The FDF03 cytoplasmic tail contained two immunoreceptor tyrosine-based inhibitory motifs (ITIM)-like sequences. Human FDF03 is a novel ITIM-bearing receptor selectively expressed by cells of myeloid origin, including DC, which may regulate functions other than that of the broadly distributed LAIR-1/p40 molecule.
COA
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