The 1A4 monoclonal antibody specifically binds to CD141. CD141 is a 75 kDa, single chain, type I membrane glycoprotein referred to as thrombomodulin and fetomodulin. CD141 is expressed on endothelial cells, smooth muscle cells, epithelial cells, synovial lining cells, and keratinocytes. It is also found on megakaryocytes, dendritic cells, peripheral blood monocytes, and neutrophils, but not on lymphocytes. Reports indicate that CD141 plays an important role in Protein C activation and the initiation of the Protein C anticoagulant pathway. Thrombin loses its procoagulant function when it binds to CD141, and the CD141/thrombin complex is able to activate Protein C.
The antibody was conjugated to BD Horizon BUV661 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 661-nm. BD Horizon Brilliant BUV661 can be excited by the ultraviolet laser (355 nm) and detected with a 670/25 filter and a 630 nm LP. Due to cross laser excitation of this dye, there may be significant spillover into channels detecting APC-like emissions (eg, 670/25-nm filter).