The 19.2 monoclonal antibody specifically binds to CD206 which is also known as the macrophage mannose receptor (MMR) or C-type lectin domain family 13 member D (CLEC13D). CD206 is a type I transmembrane glycoprotein of approximately 162 kDa which binds to glycoconjugates containing mannose, fucose, or N-acetylglucosamine. These carbohydrates are present on the surface of many microorganisms and enable the macrophage to bind to microorganisms through the MMR and internalize them during the process of phagocytosis. CD206 is expressed on human macrophages, endothelial cells, and cultured dendritic cells. It is not detected on resting monocytes. Mannose receptor expression is upregulated on peripheral blood mononuclear cells following 3 day incubation with GM-CSF.
The antibody was conjugated to BD Horizon™ BV711 which is part of the BD Horizon Brilliant™ Violet family of dyes. This dye is a tandem fluorochrome of BD Horizon BV421 with an Ex Max of 405-nm and an acceptor dye with an Em Max at 711-nm. BD Horizon BV711 can be excited by the violet laser and detected in a filter used to detect Cy™5.5 / Alexa Fluor® 700-like dyes (eg, 712/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there may be moderate spillover into the Alexa Fluor® 700 and PerCP-Cy5.5 detectors. However, the spillover can be corrected through compensation as with any other dye combination.