Recombinant Human B7-H4 Fc Chimera Biotinylated Protein, CF

R&D Systems | Catalog # BT8870

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R&D Systems
Discontinued Product
BT8870 has been discontinued. An alternative/replacement product is available: AVI8870. View all B7-H4 products.

Key Product Details

Source

HEK293

Accession Number

Q7Z7D3

Structure / Form

Disulfide-linked homodimer. Biotinylated via sugars.

Conjugate

Biotin

Applications

Bioactivity
View all B7-H4 Proteins and Enzymes »

Product Specifications

Source

Human embryonic kidney cell, HEK293-derived human B7-H4 protein
Human B7-H4
(Phe29-Ala258)
Accession # Q7Z7D3		 IEGRMD Human IgG1
(Pro100-Lys330)
N-terminus C-terminus

Purity

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

Endotoxin Level

<0.10 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis

Phe29

Predicted Molecular Mass

52 kDa (unlabeled)

SDS-PAGE

81-94 kDa and 170 - 195 kDa, reducing conditions

Activity

Measured by its ability to inhibit anti-CD3 antibody induced IL-2 secretion in human T lymphocytes.
The ED50 for this effect is 0.1-0.5 μg/mL.

Formulation, Preparation, and Storage

BT8870
Formulation Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
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
  • 12 months from date of receipt, ≤ -20 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, ≤ -20 °C under sterile conditions after reconstitution.

Calculators

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

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Background: B7-H4

B7-H4, also known as B7x and B7S1, is a 50-80 kDa glycosylated member of the B7 family of immunomodulatory proteins (1, 2). Mature human B7-H4 consists of a 235 amino acid (aa) extracellular domain (ECD) with one Ig-like V-set domain and one Ig-like C2-set domain, a 21 aa transmembrane segment, and a 2 aa cytoplasmic tail (3-5). Within the ECD, human B7-H4 shares 90% aa sequence identity with mouse and rat B7-H4. It shares 22% - 28% aa sequence identity with human B7-1, B7-2, B7-H1, B7-H2, B7-H3, and PD-L2. Alternate splicing of human B7-H4 generates an additional isoform that lacks the first Ig-like domain. B7-H4 is expressed on the surface of activated lymphocytes, macrophages, monocytes, dendritic cells, epithelial cells, and bone marrow-derived mesenchymal stem cells
(4-8). Its binding to activated T cells dampens T cell responses and induces cell cycle arrest in the T cell (3-5). Reverse signaling can induce either cell cycle arrest or apoptosis in the B7-H4 expressing cell (9, 10). B7-H4 is up-regulated in several carcinomas in correlation with tumor progression and metastasis (2, 7, 11, 12). A soluble form of B7-H4 is elevated in the serum of ovarian cancer, renal cell carcinoma, and rheumatoid arthritis patients, also in correlation with advanced disease status (13-15). Soluble B7-H4 functions as a decoy molecule that blocks the inhibitory influence of B7-H4 on immune activation (15). Despite evidence for the involvement of B7-H4 in immune regulation, mice deficient in its expression do not show significant immune deficiencies, suggesting compensation by other molecules in vivo (16).

References

  1. Yi, K.H. and L. Chen (2009) Immunol. Rev. 229:145.
  2. Salceda, S. et al. (2005) Exp. Cell Res. 306:128.
  3. Zang, X. et al. (2003) Proc. Natl. Acad. Sci. 100:10388.
  4. Prasad, V.R. et al. (2003) Immunity 18:863.
  5. Sica, G.L. et al. (2003) Immunity 18:849.
  6. Kryczek, I. et al. (2006) J. Exp. Med. 203:871.
  7. Tringler, B. et al. (2005) Clin. Cancer Res. 11:1842.
  8. Xue, Q. et al. (2010) Stem Cells Dev. 19:27.
  9. Song, H. et al. (2008) Cancer Lett. 266:227.
  10. Park, G.B. et al. (2009) Immunology 128:360.
  11. Zang, X. et al. (2007) Proc. Natl. Acad. Sci. 104:19458.
  12. Krambeck, A.E. et al. (2006) Proc. Natl. Acad. Sci. 103:10391.
  13. Simon, I. et al. (2006) Cancer Res. 66:1570.
  14. Thompson, R.H. et al. (2008) Cancer Res. 68:6054.
  15. Azuma, T. et al. (2009) PloS Med. 6:e1000166.
  16. Suh, W.-K., et al. (2006) Mol. Cell. Biol. 26:6403.

Long Name

B7 Homolog 4

Alternate Names

B7H4, B7S1, B7x, Vtcn1

Entrez Gene IDs

79679 (Human); 242122 (Mouse); 295322 (Rat)

Gene Symbol

VTCN1

UniProt

Q7Z7D3

Additional B7-H4 Products

Product Documents for Recombinant Human B7-H4 Fc Chimera Biotinylated Protein, CF

Certificate of Analysis

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Product Specific Notices for Recombinant Human B7-H4 Fc Chimera Biotinylated Protein, CF

For research use only

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