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Invitrogen
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Description: The eBio20A monoclonal antibody reacts with human CD152, also known as cytotoxic T lymphocyte antigen-4 (CTLA-4). CTLA-4, a protein with structural similarities to CD28, is expressed on activated T cells (activated B cells may also express CTLA-4) and binds the B7 family members, CD80 (B7-1) and CD86 (B7-2), with higher affinity than CD28 does. CTLA-4 and CD28 appear to deliver opposing signals to T cells: while CD28 is a potent costimulator, CTLA-4 restricts the progression of T cells to an activated state by inhibiting IL-2 secretion and cellular proliferation. The cytoplasmic portion of CTLA-4 contains ER retention motifs, resulting in intracellular localization of a large proportion of newly synthesized CTLA-4 in response to TCR signaling.
Applications Reported: This eBio20A (20A, A3) antibody has been reported for use in flow cytometric analysis.
Applications Tested: This eBio20A (20A, A3) antibody has been pre-titrated and tested by intracellular staining and flow cytometric analysis of PHA stimulated normal human peripheral blood cells. This can 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.
Excitation: 488-561 nm; Emission: 578 nm; Laser: Blue Laser, Green Laser, Yellow-Green Laser.
Filtration: 0.2 µm post-manufacturing filtered.
CTLA4 (Cytotoxic T-Lymphocyte Antigen 4) is a CD28-family receptor expressed on mainly CD4+ T cells. It binds the same ligands as CD28 (CD80 and CD86 on B cells and dendritic cells), but with higher affinity than CD28. However, in contrast to CD28 which enhances cell function when bound at the same time as the T cell receptor, CTLA4 inhbits the T cell and prevents it from functioning. Intracellular CTLA4 is also found in regulatory T cells and may be important to their function.
For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.
Protein Aliases: CD152; CD152 isoform; celiac disease 3; CTLA-4; cytotoxic T lymphocyte associated antigen 4 short spliced form; Cytotoxic T-lymphocyte protein 4; Cytotoxic T-lymphocyte-associated antigen 4; cytotoxic T-lymphocyte-associated protein 4; cytotoxic T-lymphocyte-associated serine esterase-4; ICOS; insulin-dependent diabetes mellitus 12; ligand and transmembrane spliced cytotoxic T lymphocyte associated antigen 4
Gene Aliases: ALPS5; CD; CD152; CELIAC3; CTLA-4; CTLA4; GRD4; GSE; IDDM12
UniProt ID: (Human) P16410
Entrez Gene ID: (Human) 1493
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