The 15-2 monoclonal antibody specifically recognizes CD206 which is also known as Macrophage mannose receptor (MMR) or C-type lectin domain family 13 member D (CLEC13D). CD206 (MMR) is a ~175 kDa type I transmembrane glycoprotein that is encoded by MRC1 (Mannose receptor C-type 1) which belongs to the mannose receptor family. The extracellular region of CD206 (MMR) is comprised of an N-terminal cysteine-rich domain, followed by a fibronectin type II domain, eight carbohydrate recognition domains (CRD), a transmembrane segment, and a short cytoplasmic tail. CD206 (MMR) is expressed on human macrophages, immature dendritic cells, and endothelial cells. It is not detected on resting monocytes. CD206 (MMR) can function as a Pattern Recognition Receptor (PRR) since it binds to glycoconjugates containing mannose, fucose, or N-acetylglucosamine that are present on the surface of many microorganisms. This receptor enables macrophages and dendritic cells to bind and internalize microbes and their products through endocytosis and phagocytosis and to participate in innate immunity as well as antigen processing related to antigen presentation for adaptive immune responses.
The antibody was conjugated to BD Horizon™ BV650 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 650-nm. BD Horizon BV650 can be excited by the violet laser and detected in a filter used to detect APC-like dyes (eg, 660/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there will be spillover into the APC and Alexa Fluor® 700 detectors. However, the spillover can be corrected through compensation as with any other dye combination.