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™ BUV563 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 which has an Ex Max of 348 nm and an acceptor dye. The tandem has an Em Max at 563 nm. BD Horizon BUV563 can be excited by the 355 nm ultraviolet laser. On instruments with a 561 nm Yellow-Green laser, the recommended bandpass filter is 585/15 nm with a 535 nm long pass to minimize laser light leakage. When BD Horizon BUV563 is used with an instrument that does not have a 561 nm laser, a 560/40 nm filter with a 535 nm long pass may be more optimal. Due to the excitation and emission characteristics of the acceptor dye, there may be spillover into the PE and PE-CF594 detectors. However, the spillover can be corrected through compensation as with any other dye combination.