Human CTLA‑4 Antibody

1 citations
  • Specificity
    Detects human CTLA-4 in direct ELISAs and Western blots. In Western blots, approximately 25% cross-reactivity with recombinant mouse CTLA-4 is observed.
  • Source
    Polyclonal Goat IgG
  • Purification
    Antigen Affinity-purified
  • Immunogen
    S. frugiperda insect ovarian cell line Sf 21-derived recombinant human CTLA-4
    Accession # Q6GR94
  • Formulation
    Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
  • Label
  • Western Blot
    0.1 µg/mL
    Recombinant Human CTLA‑4 Fc Chimera (Catalog # 325-CT)
  • Flow Cytometry
    2.5 µg/106 cells
    See below
  • Immunocytochemistry
    5-15 µg/mL
    See below
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Data Examples
CTLA‑4 in Human Peripheral Blood Mononuclear Cells. CTLA‑4 was detected in immersion fixed human peripheral blood mononuclear cells treated with treated with PMA and calcium ionomycin using Goat Anti-Human CTLA‑4 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF-386-PB) at 15 µg/mL for 3 hours at room temperature. Cells were stained using the NorthernLights™ 557-conjugated Anti-Goat IgG Secondary Antibody (red; Catalog # NL001) and counterstained with DAPI (blue). Specific staining was localized to cell surfaces. View our protocol for Fluorescent ICC Staining of Non-adherent Cells.
Detection of CTLA‑4 in NS0 Mouse Cell Line Co-transfected with CTLA-4 and eGFP by Flow Cytometry. NS0 mouse myeloma cell line co-transfected with human CTLA-4 and eGFP was stained with either (A) Goat Anti-Human CTLA‑4 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF-386-PB) or (B) Normal Goat IgG Control (Catalog # AB-108-C) followed by Allophycocyanin-conjugated Anti-Goat IgG Secondary Antibody (Catalog # F0108).
Preparation and Storage
  • Reconstitution
    Reconstitute at 0.2 mg/mL in sterile PBS.
  • Shipping
    The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
  • Stability & Storage
    Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
    • 12 months from date of receipt, -20 to -70 °C as supplied.
    • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
    • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Background: CTLA-4

CTLA-4 and CD28, together with their ligands B7-1 and B7-2, constitute one of the dominant costimulatory pathways that regulate T- and B-cell responses. CTLA-4 and CD28 are structurally homologous molecules that are members of the immunoglobulin (Ig) gene superfamily. Both CTLA-4 and CD28 are composed of a single Ig V‑like extracellular domain, a transmembrane domain and an intracellular domain. CTLA-4 and CD28 are both expressed on the cell surface as disulfide-linked homodimers or as monomers. The genes encoding these two molecules are closely linked on human chromosome 2. CTLA-4 was originally identified as a gene that was specifically expressed by cytotoxic T lymphocytes. However, CTLA-4 transcripts have since been found in both Th1 and Th2, and CD4+ and CD8+ T cell clones. Whereas CD28 expression is constitutive on the surfaces of 95% of CD4+ T cells and 50% of CD8+ T cells and is down regulated upon T cell activation, CTLA-4 expression is upregulated rapidly following T cell activation and peaks approximately 24 hours following activation. Although both CTLA-4 and CD28 can bind to the same ligands, CTLA-4 binds to B7-1 and B7-2 with 20‑100‑fold higher affinity than CD28. The physiological role of CTLA-4 in T cell costimulation is currently being studied.

  • References:
    1. Lenschow, D.J. et al. (1996) Annu. Rev. Immunol. 14:233.
    2. Hathcock, K.S. and R.J. Hodes (1996) Advances in Immunol. 62:131.
    3. Ward, S.G. (1996) Biochem. J. 318:361.
  • Long Name:
    Cytotoxic T-lymphocyte-associated Molecule 4
  • Alternate Names:
    CD152; CD; CD152 antigen; CD152IDDM12; CD28; celiac disease 3; CELIAC3; CTLA-4; cytotoxic T-lymphocyte antigen 4; cytotoxic T-lymphocyte protein 4; Cytotoxic T-lymphocyte-associated antigen 4; cytotoxic T-lymphocyte-associated protein 4; cytotoxic T-lymphocyte-associated serine esterase-4; GRD4; GSE; ICOS; ligand and transmembrane spliced cytotoxic T lymphocyte associated antigen 4
Related Research Areas

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

Showing Results 1 - 1 of 1

  1. Inhibitory receptors are expressed by Trypanosoma cruzi-specific effector T cells and in hearts of subjects with chronic Chagas disease.
    Authors: Arguello RJ, Albareda MC, Alvarez MG, Bertocchi G, Armenti AH, Vigliano C, Meckert PC, Tarleton RL, Laucella SA
    PLoS ONE, 2012;7(5):e35966.
    Species: Human
    Sample Type: tissue
    Application: IHC Paraffin-embedded,


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