The 68-5H11 monoclonal antibody specifically binds to CD62E. This adhesion molecule is a 97-115 kDa type I transmembrane glycoprotein that is encoded by the SELE gene. CD62E is also known as E-selectin, Endothelial-leukocyte adhesion molecule-1 (ELAM-1), and Leukocyte endothelial cell adhesion molecule 2 (LECAM-2). CD62E is minimally expressed by unstimulated endothelium. Activated endothelial cells upregulate surface CD62E expression in response to various activators including inflammatory cytokines such as Interleukin-1 and Tumor Necrosis Factor. CD62E plays a role in leucocyte extravasation by promoting leucocyte rolling on activated endothelial cells during inflammation. CD62E may also play a role in the metastasis of certain tumor cells. The adhesion between endothelial CD62E molecules and a carbohydrate ligand on neutrophils is inhibited by the mAb 68-5H11.
The antibody was conjugated to BD Horizon™ BUV496 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 496-nm. BD Horizon BUV496 can be excited by the ultraviolet laser (355 nm) and detected with a 515/30 nm filter with a 450LP. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into the channel detecting BD Horizon V500 or BV510 (eg, 525/40-nm filter). However, the spillover can be corrected through compensation as with any other dye combination.