About InVivoSIM anti-human CTLA-4 (Tremelimumab Biosimilar) This biosimilar antibody uses the same variable regions from the therapeutic antibody Tremelimumab making it ideal for research use. This Tremelimumab biosimilar is a fully human monoclonal antibody which reacts with human CTLA-4 (cytotoxic T lymphocyte antigen-4) also known as CD152. CTLA-4 is a 33 kDa cell surface receptor encoded by the Ctla4 gene that belongs to the CD28 family of the Ig superfamily. CTLA-4 is expressed on activated T and B lymphocytes. CTLA-4 is structurally similar to the T-cell co-stimulatory protein, CD28, and both molecules bind to the B7 family members B7-1 (CD80) and B7-2 (CD86). Upon ligand binding, CTLA-4 negatively regulates cell-mediated immune responses. CTLA-4 plays roles in induction and/or maintenance of immunological tolerance, thymocyte development, and regulation of protective immunity. CTLA-4 is among a group of inhibitory receptors being used as cancer treatment targets through immune checkpoint blockade. Tremelimumab binds to CTLA-4, blocking the inhibitory signal, which allows the cytotoxic T cells to kill cancer cells. Tremelimumab and Ipilimumab are both fully human monoclonal antibodies directed against CTLA-4, but Ipilimumab is an IgG1 isotype and Tremelimumab is a non-complement-fixing IgG2 isotype. InVivoSIM anti-human CTLA-4 (Tremelimumab Biosimilar) Specifications IsotypeHuman IgG2, κ Recommended Dilution BufferInVivoPure pH 7.0 Dilution Buffer ImmunogenHuman CTLA-4 Reported ApplicationsCTLA-4 neutralization Flow Cytometry ELISA Western Blot FormulationPBS, pH 7.0 Contains no stabilizers or preservatives Endotoxin<0.5EU/mg (<0.0005EU/μg) Determined by LAL gel clotting assay Aggregation<5% Determined by SEC Purity>95% Determined by SDS-PAGE Sterility0.2 μm filtration ProductionPurified from cell culture supernatant in an animal-free facility PurificationProtein A Molecular Weight150 kDa StorageThe antibody solution should be stored at the stock concentration at 4°C. Do not freeze.
