The WT.5 monoclonal antibody specifically recognizes the alpha subunit of LFA-1 (αLβ2 integrin, CD11a/CD18), a heterodimeric surface glycoprotein which is found on the majority of leukocytes, but not on peritoneal macrophages or peritoneal mast cells. LFA-1 mediates a variety of heterotypic and homotypic intercellular adhesions through interaction with ICAM-1 (CD54) and ICAM-2 (CD102). WT.1 mAb recognizes both the activated and unactivated forms of LFA-1. It inhibits the binding of LFA-1 to ICAM-1 in several in vitro assays, including binding of Concanavalin A-stimulated lymphocytes (Con A blasts) to purified ICAM-1 and Mg2+-dependent aggregation of concanavalin A-stimulated blasts. It has also been reported to inhibit leukocyte infiltration in several in vivo models of inflammation.
This antibody is conjugated to BD Horizon™ BV605 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 407-nm and Em Max of 602-nm, BD Horizon BV605 can be excited by a violet laser and detected with a standard 610/20-nm filter set. BD Horizon BV605 is a tandem fluorochrome of BD Horizon BV421 and an acceptor dye with an Em max at 605-nm. Due to the excitation of the acceptor dye by the green (532 nm) and yellow-green (561 nm) lasers, there will be significant spillover into the PE and BD Horizon PE-CF594 detectors off the green or yellow-green lasers. BD Horizon BV605 conjugates are very bright, often exhibiting brightness equivalent to PE conjugates and can be used as a third color off of the violet laser.