BioAim Scientific (Kanada)
The Bioaim Mouse CTLA4 ELISA kit is a solid phase sandwich ELISA (enzyme-linked immunosorbent assay) for the quantitative measurement of CTLA4 in mouse serum, plasma and cell culture media. An antibody specific for mouse CTLA4 was coated on a 96-well plate. Standards and samples are added to the wells and any CTLA4 present binds to the immobilized antibody. The wells are washed and biotinylated anti-mouse CTLA4 antibody is added. After washing away unbound biotinylated antibody, HRP-conjugated streptavidin is added to the wells. The wells are again washed and TMB substrate solution is added, which produces a blue color in direct proportion to the amount of CTLA4 present in the initial sample. The Stop Solution changes the color from blue to yellow, and the microwell absorbances are read at 450 nm.Research Area immune response;
cytotoxic T-lymphocyte-associated protein 4(CTLA-4) Background: CTLA4 or CTLA-4 (cytotoxic T-lymphocyte-associated protein 4), also known as CD152, is a protein receptor that, functioning as an immune checkpoint, downregulates immune responses. CTLA4 is constitutively expressed in Tregs but only upregulated in conventional T cells after activation. It acts as an “off” switch when bound to CD80 or CD86 on the surface of antigen-presenting cells.CTLA4 is a member of the immunoglobulin superfamily that is expressed by activated T cells and transmits an inhibitory signal to T cells. CTLA4 is homologous to the T-cell co-stimulatory protein, CD28, and both molecules bind to CD80 and CD86, also called B7-1 and B7-2 respectively, on antigen-presenting cells. CTLA-4 binds CD80 and CD86 with greater affinity and avidity than CD28 thus enabling it to outcompete CD28 for its ligands. CTLA4 transmits an inhibitory signal to T cells, whereas CD28 transmits a stimulatory signal. CTLA4 is also found in regulatory T cells and contributes to its inhibitory function. T cell activation through the T cell receptor and CD28 leads to increased expression of CTLA-4.
Cd152, Ctla-4, Ly-56
Serum, plasma, Cell culture supernatant
|Antigen Name||cytotoxic T-lymphocyte-associated protein 4|
|Detection Range||6.1-1500 pg/ml|
|Alias||Cd152, Ctla-4, Ly-56|