The FR70 monoclonal antibody specifically binds to mouse CD70, a 30-33-kDa type-II transmembrane glycoprotein belonging to the TNF/NGF superfamily. CD70 is the ligand for CD27 and is expressed primarily on activated B cells. CD70 expression can be induced by activation of splenocytes with lipopolysaccharide and stimulatory antibodies specific for IgM, CD40 or both. mRNA coding for CD70 is transiently expressed after Concanavalin A stimulation of splenocytes or thymocytes. CD70 has been observed to be expressed on dendritic cells of Leishmania major-infected mice. The CD27-CD70 interaction delivers costimulatory signals to T cells and NK cells. It has been reported that FR70 antibody blocks binding of mCD27-Ig fusion protein to mouse Cd70-transfected cells and inhibits some in vitro T-cell- and NK-cell-dependent responses.
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.