
- Species ReactivityMouse
- SpecificityDetects mouse B7-1/CD80 in direct ELISAs and Western blots. Shows approximately 50% cross‑reactivity with recombinant human
(rh) B7-H1 and no cross-reactivity with rhB7-1, recombinant mouse (rm) rmB7-2, and rmB7-H2. - SourceMonoclonal Rat IgG2A Clone # 111114
- PurificationProtein A or G purified from hybridoma culture supernatant
- ImmunogenMouse myeloma cell line NS0-derived recombinant mouse B7-1/CD80
Val38-Asn246
Accession # Q00609 - FormulationLyophilized 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.
- LabelUnconjugated
- Western Blot5 µg/mLSee below
- Immunohistochemistry5-25 µg/mLSee below
- ReconstitutionReconstitute at 0.5 mg/mL in sterile PBS.
- ShippingThe 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 & StorageUse 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.
- Azuma, M. et al. (1993) Nature 366:76.
- Freeman, G.J. et al. (1993) Science 262:909.
- Freeman, G. et al. (1991) J. Exp. Med. 174:625.
- Selvakumar, A. et al. (1993) Immunogenetics 38:292.
- Chen, C. et al. (1994) J. Immunol. 152:4929.
- Freeman, G.J. et al. (1993) J. Exp. Med. 178:2185.
- Entrez Gene IDs:941 (Human); 12519 (Mouse); 25408 (Rat); 102140078 (Cynomolgus Monkey)
- Alternate Names:Activation B7-1 antigen; B7; B71; B7-1; BB1; CD28LG1; CD28LGB7-1 antigen); CD80 antigen; CD80 molecule; CD80; costimulatory factor CD80; costimulatory molecule variant IgV-CD80; CTLA-4 counter-receptor B7.1; T-lymphocyte activation antigen CD80
Background:
B7-1 and B7-2, together with their receptors CD28 and CTLA-4, constitute one of the dominant costimulatory 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 interferongamma. B7-1 and B7-2 are both members of the immunoglobulin superfamily. Mouse B7-1 is a 306 amino acid (aa) protein containing a putative 37 aa signal peptide, a 190 aa extracellular domain, a 22 aa transmembrane domain, and a 38 aa cytoplasmic domain. Mouse B7-1 and B7-2 share 28% amino acid identity. Mouse and human B7-1 share 44% amino acid identity. 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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