The 63D3.rMAb is a recombinant monoclonal antibody that specifically recognizes human CD14 which is also known as Monocyte differentiation antigen CD14, Myeloid cell-specific leucine-rich glycoprotein, or LPS Receptor (LPS-R). CD14 is expressed as an ~55 kDa glycophosphatidylinositol (GPI)-linked cell surface glycoprotein. CD14 is highly expressed on most mature monocytes and macrophages, and at lower levels on neutrophils. CD14 is also expressed on some dendritic cells (DC) and Langerhans cells. CD14 binds to bacterial cell wall components including lipopolysaccharide (LPS) bound to lipopolysaccharide-binding protein (LBP). CD14 serves as a co-receptor for certain signaling Toll-like receptors (TLRs) for the cellular detection and response to LPS as well as other pathogen-associated molecular patterns (PAMPs). Ligand-bound CD14 plays a role in stimulating various myeloid cells to produce pro-inflammatory cytokines and mediators and to upregulate the expression of cell surface adhesion molecules. Soluble forms of CD14 (sCD14) are reportedly released by cells into the blood or other bodily fluids. Soluble CD14 can regulate cellular responses to LPS and confer LPS-responsiveness to cells that do not ordinarily express CD14.
The antibody was conjugated to BD Horizon BV750 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 750-nm. BD Horizon Brilliant BV750 can be excited by the violet laser (405 nm) and detected with a 750/30 nm filter with a 740 nm long pass. Due to spectral differences between labeled cells and beads, using BD™ CompBeads can result in incorrect spillover values when used with BD Horizon BV750 reagents. Therefore, the use of BD CompBeads or BD CompBeads Plus to determine spillover values for these reagents is not recommended.