The TU41 monoclonal antibody specifically binds to the intracellular adhesion molecule-3 (ICAM-3) which is also known as CD50. ICAM-3 is a 110-120 kDa type I membrane glycoprotein expressed on all leukocytes (platelets and erythrocytes are ICAM-3-negative). ICAM-3 is also expressed on epidermal Langerhans cells and endothelial cells. It predominantly interacts with LFA-1 (CD11a/CD18) without requiring activation as the initial dendritic cell-T lymphocyte interaction. ICAM-3 is an important LFA-1 ligand that functions in the initiation of the immune/inflammatory response and also plays a role in chemotaxis.
The antibody was conjugated to BD Horizon™ BV421 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 407-nm and Em Max at 421-nm, BD Horizon BV421 can be excited by the violet laser and detected in the standard Pacific Blue™ filter set (eg, 450/50-nm filter). BD Horizon BV421 conjugates are very bright, often exhibiting a 10 fold improvement in brightness compared to Pacific Blue conjugates.