Recombinant Human B7-H7/HHLA2 Fc Chimera Protein, CF Summary
Accession # Q9UM44
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
|Formulation||Lyophilized from a 0.2 μm filtered solution in PBS.|
|Reconstitution||Reconstitute at 100 μg/mL in PBS.|
|Shipping||The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.|
|Stability & Storage:||Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
Recombinant Human B7-H7/HHLA2 Fc Chimera (Catalog # 8084-B7) inhibits anti-CD3 antibody induced IL-2 secretionin human T lymphocytes. The ED50 for this effect is 2-10 μg/mL.
B7-H7, also known as HHLA2 (HERV-H LTR-associating 2), is a member of the B7 family of immune regulatory proteins (1, 2). Mature human B7-H7 consists of a 322 amino acid (aa) extracellular domain (ECD) with three immunoglobulin-like domains, a 21 aa transmembrane segment, and a 49 aa cytoplasmic domain (3-5). B7‑H7 is constitutively expressed on monocytes and is up-regulated by LPS and IFN-gamma stimulation. It is expressed on LPS/IFN-gamma treated B cells but not on resting B cells (5). B7-H7 binds to cell surface determinants on resting and mature T cells, B cells, and monocytes as well as on immature and mature dendritic cells (5). Soluble B7-H7 inhibits the proliferation of activated CD4+ and CD8+ T cells and their production of IFN-gamma, TNF-alpha, IL-5, IL-10, IL-13, IL-17A, and IL-22 (5).
- Zou, W. and L. Chen (2008) Nat. Rev. Immunol. 8:467.
- Bour-Jordan, H. et al. (2011) Immunol. Rev. 241:180.
- Mager, D.L. et al. (1999) Genomics 59:255.
- Flajnik, M.M. et al. (2012) Immunogenetics 64:571.
- Zhao, R. et al. (2013) Proc. Natl. Acad. Sci. USA 110:9879.
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