| Antigen Background | CD28 is expressed on thymocytes, peripheral lineage cell subsets, activated B cells and plasma cells. The antigen is involved in adhesion between T and B lymphocytes through the B7/BB-1 ligand expressed on activated B cells. CD28 co-stimulates T-cells activated via the CD3 T-cell receptor and CD2 pathways and induces their proliferation. |
| Immunogen | human CD28 transfected murine T cell hybridoma. |
| Preparation Note | Prepared by conjugation to R-phycoerythrin (PE). This orange-red dye is efficiently excited at 488 nm and emits at 578 nm. |
| Specificity | Recognizes the CD28 (44 kDa) human cell surface disulfide-linked, homodimeric glycoprotein. The antibody reacts with human CD28-transfected murine T-cell hybridoma, PHA-activated blasts and IL-6 dependent plasmacytoma lines. It cross reacts with rhesus monkey PBL. The antibody blocks CD28/B7 (CD80) mediated cell-cell adhesion. It binds to the CDR domain in a CDR1 dependent manner. It enhances CD3 monoclonal antibody-induced T-cell proliferation. May be used in adhesion and co-stimulation studies.
5th Workshop: code no. CD28.05. |
| Physical form | Solution in 0.01 M phosphate buffered saline, pH 7.4, containing 1% bovine serum albumin and 15 mM sodium azide. |
