The Neu 24.7 monoclonal antibody specifically recognizes HER-2/neu, which is also known as p185HER2 or CD340. HER-2/neu is a ~185 kDa type I transmembrane glycoprotein that is encoded by ERBB2 (erb-b2 receptor tyrosine kinase 2) which belongs to the ERBB receptor kinase family. The HER-2/neu antigen is expressed on some breast cancer cells. Amplification and/or over expression of HER-2/neu occurs in multiple human malignancies. Overexpression is reported to be strongly correlated with progression of human ovarian and breast carcinomas. Anti-HER-2/neu stains the external domain of this protein on cells such as the strongly expressing line SKBR3 and the weakly expressing line MCF7. HER-2/neu is also expressed on normal bone marrow mesenchymal stem cells (MSC).
The antibody was conjugated to BD Horizon™ BV650 which is part of the BD Horizon Brilliant™ Violet family of dyes. This dye is a tandem fluorochrome of BD Horizon BV421 with an Ex Max of 405-nm and an acceptor dye with an Em Max at 650-nm. BD Horizon BV650 can be excited by the violet laser and detected in a filter used to detect APC-like dyes (eg, 660/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there will be spillover into the APC and Alexa Fluor® 700 detectors. However, the spillover can be corrected through compensation as with any other dye combination.