CD98 is a disulfide-linked heterodimer composed of a ~80-85 kDa, type II membrane glycoprotein heavy chain, (CD98hc), and ~40-45 kDa light chain. The UM7F8 monoclonal antibody specifically recognizes CD98hc, which is also known as 4F2 heavy chain antigen (4F2hc). CD98 is broadly expressed on hematopoietic cells, including peripheral blood lymphocytes, monocytes and granulocytes (low), as well as non-hematopoietic cells, eg, intestinal epithelial cells. CD98 expression is upregulated on activated and proliferating cells. CD98hc is encoded by the SLC3A2 [solute carrier family 3 (amino acid transporter heavy chain), member 2] gene. CD98 reportedly functions in transmembrane amino acid transport and in the regulation of integrin signaling which are involved in the regulation of cellular activation, proliferation, and survival. The UM7F8 antibody is reportedly a functional antibody that can costimulate T cell proliferative responses.
The antibody was conjugated to BD Horizon BB515 which is part of the BD Horizon Brilliant™ Blue family of dyes. With an Ex Max near 490 nm and an Em Max near 515 nm, BD Horizon BB515 can be excited by the blue laser (488 nm) laser and detected with a 530/30 nm filter. This dye has been exclusively developed by BD Biosciences and is up to seven times brighter than FITC with less spillover into the PE channel. Due to similar excitation and emission properties, BB515, FITC, and Alexa Fluor® 488 cannot be used simultaneously. It is not recommended to use BB515 in cocktails that include Streptavidin conjugates as it may cause high background.