The 24D2 monoclonal antibody specifically recognizes CD340 which is also known as Human epidermal growth factor receptor 2 (HER-2 or HER2), Neu (neuro/glioblastoma derived oncogene homolog), or Metastatic lymph node gene 19 protein (MLN19). CD340 (HER-2) is a ~185 kDa type I transmembrane glycoprotein that is encoded by ERBB2 (erb-b2 receptor tyrosine kinase 2) and belongs to the ERBB family of receptor tyrosine kinases that includes EGFR, HER3, and HER4. Although CD340 (HER-2) has no identified direct-binding ligand, it can form heterodimers with other ligand-bound ERBB family members. CD340 (HER-2) helps activate intracellular signaling pathways including mitogen-activated protein kinase (MAPK) and phosphatidylinositol-3 kinase (PI-3K) through its cytoplasmic tyrosine kinase-containing region. CD340 (HER-2) is expressed by bone marrow mesenchymal stem cells. It is overexpressed and plays a significant role in the development of multiple human cancers including some leukemias, neuroblastomas, and carcinomas of the breast, ovary, cervix, colon, and lung.
The antibody was conjugated to BD Horizon Red 718, which has been developed exclusively for BD Biosciences as a better alternative to Alexa Fluor® 700. BD Horizon Red 718 can be excited by the red laser (628 – 640 nm) and, with an Em Max around 718 nm, it can be detected using a 730/45 nm filter. Due to similar excitation and emission properties, we do not recommend using R718 in combination with APC-R700 or Alexa Fluor® 700.