CD28 Monoclonal Antibody (CD28.2), Alexa Fluor™ 700, eBioscience™, Invitrogen™

Description

• Description: The CD28.2 monoclonal antibody reacts with the human CD28 molecule, a 44 kDa homodimer expressed by thymocytes, mature T cells and plasma cells
• CD28 is a ligand for CD80 (B7-1) and CD86 (B7-2) and is a potent co-stimulator of T cells
• Signaling through CD28 augments IL-2 and IL-2 receptor expression as well as cytotoxicity of CD3-activated T cells
• Applications Reported: This CD28.2 antibody has been reported for use in flow cytometric analysis
• Applications Tested: This CD28.2 antibody has been pre-diluted and tested by flow cytometric analysis of normal human peripheral blood cells
• This may be used at 5 μL (0.125 μg) per test
• A test is defined as the amount (μg) of antibody that will stain a cell sample in a final volume of 100 μL
• Cell number should be determined empirically but can range from 10^5 to 10^8 cells/test
• Alexa Fluor 700 emits at 723 nm and can be excited with the red laser (633-647 nm)
• Most instruments will require a 685 LP mirror and 710/20 band pass filter
• Please make sure that your instrument is capable of detecting this fluorochrome
• Excitation: 633-647 nm; Emission: 723 nm; Laser: Red Laser CD28 antigen is a 44 kDa disulfide linked homodimeric T cell specific surface glycoprotein
• CD28 is a cell adhesion molecule of the immunoglobulin superfamily which is constitutively expressed on most peripheral blood T lymphocytes
• Moreover, CD28 is the critical T cell costimulatory receptor that provides the cell the important second activation signal by binding CD80 and CD86 which are expressed by antigen presenting cells
• In addition to its co-stimulation role, CD28 functions by preventing T cells from entering an anergic-hyporesponsive state or from undergoing premature apoptotic cell death
• In murine peripheral lymphoid organs and in the blood, all CD4+ and CD8+ T cells express CD28
• In the thymus, CD28 expression is highest on immature CD3-, CD8+ and CD4+8+ cells, and on CD4-8- cells that express alpha/beta and gamma/delta TCR
• The level of CD28 on mature CD4+ and CD8+ alpha/beta TCR+ thymocytes is two- to fourfold lower than on the immature cells
• Diseases associated with CD28 dysfunction include mycosis fungiodes and Sezary's Disease.