The 7-517 monoclonal antibody specifically binds to CD276, also known as B7-H3 (B7 homolog 3). CD276 is a type I transmembrane glycoprotein and member of the B7 family of immunoregulatory proteins. Although the CD276 gene transcript is expressed in nearly all normal tissues, the protein is preferentially expressed in tumors, tumor cell lines, sinonasal epithelial cells, and extravillous trophoblast and Hofbauer cells of the placenta. CD276 protein expression can be induced by activation of T and B lymphocytes, natural killer (NK) cells and antigen-presenting cells. The roles of CD276 in the regulation of immune responses, especially to cancer, are under investigation.
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.