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 BUV615 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome with an Ex Max near 350 nm and an Em Max near 615 nm. BD Horizon Brilliant BUV615 can be excited by the ultraviolet laser (355 nm) and detected with a 610/20 filter and a 595 nm LP. Due to the excitation of the acceptor dye by the blue/yellow-green laser line, there may be significant spillover into channels detecting PE-CF594 like emissions (eg, 610/20-nm filter).