|Detection of B7‑1/CD80 in Raji Human Cell Line by Flow Cytometry. Raji human Burkitt's lymphoma cell line was stained with Mouse Anti-Human B7‑1/CD80 Monoclonal Antibody (Catalog # MAB140, filled histogram) or isotype control antibody (Catalog # MAB002, open histogram), followed by Fluorescein-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # F0103B).|
IL‑2 secretion Induced by B7‑1/CD80 and Neutralization by Human B7‑1/CD80 Antibody. |
Recombinant Human B7‑1/CD80 Fc Chimera (Catalog # 140-B1) co-stimulates IL‑2 secretion in the Jurkat human acute T cell leukemia cell line in the presence of PHA in a dose-dependent manner (orange line), as measured by the Human IL‑2 Quantikine ELISA Kit (Catalog # D2050). IL‑2 secretion elicited by Recombinant Human B7‑1/CD80 Fc Chimera (1 µg/mL) and PHA (10 µg/mL) is neutralized (green line) by increasing concentrations of Mouse Anti-Human B7‑1/CD80 Monoclonal Antibody (Catalog # MAB140). The ND50 is typically 0.2-1 µg/mL.
|B7‑1/CD80 in Human Tonsil. B7‑1/CD80 was detected in immersion fixed paraffin-embedded sections of human tonsil using Mouse Anti-Human B7‑1/CD80 Monoclonal Antibody (Catalog # MAB140) at 5 µg/mL overnight at 4 °C. Tissue was stained using the Anti-Mouse HRP-DAB Cell & Tissue Staining Kit (brown; Catalog # CTS002) and counterstained with hematoxylin (blue). Specific staining was localized to cytoplasm in lymphocytes. View our protocol for Chromogenic IHC Staining of Paraffin-embedded Tissue Sections.|
B7-1 and B7-2, together with their receptors CD28 and CTLA-4, constitute one of the dominant co-stimulatory pathways that regulate T- and B-cell responses. Although both CTLA-4 and CD28 can bind to the same ligands, CTLA-4 binds to B7-1 and B7-2 with a 20‑100 fold higher affinity than CD28 and is involved in the down‑regulation of the immune response. B7-1 is expressed on activated B cells, activated T cells, and macrophages. B7-2 is constitutively expressed on interdigitating dendritic cells, Langerhans cells, peripheral blood dendritic cells, memory B cells, and germinal center B cells. Additionally, B7-2 is expressed at low levels on monocytes and can be up‑regulated through Interferon gamma. B7-1 and B7-2 are both members of the Immunoglobulin superfamily. Human B7-1 is a 288 amino acid (aa) protein containing a 34 aa signal peptide, a 208 aa extracellular domain, a 21 aa transmembrane domain, and a 25 aa cytoplasmic domain. Human B7-1 and B7-2 share 26% aa sequenceidentity. Human and mouse B7-1 share 44% aa sequenceidentity. However, it has been observed that both human and mouse B7-1 and B7-2 can bind to either human or mouse CD28 and CTLA-4, suggesting that there are conserved amino acids which form the B7-1/B7-2/CD28/CTLA-4 critical binding sites.
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