Human VSIG4 Biotinylated Antibody

Catalog #: BAF4646 Datasheet / COA / SDS

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BAF4646

All VSIG4 Antibodies

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Human VSIG4 Biotinylated Antibody Summary

Species Reactivity

Human

Specificity

Detects human VSIG4 in Western blots. In Western blots, approximately 15% cross-reactivity with recombinant mouse VSIG4 is observed.

Source

Polyclonal Goat IgG

Purification

Antigen Affinity-purified

Immunogen

Mouse myeloma cell line NS0-derived recombinant human VSIG4
Arg20-Pro283
Accession # Q9Y279

Formulation

Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein.

Label

Biotin

Applications

Recommended Concentration

Sample

Western Blot

0.1 µg/mL

Recombinant Human VSIG4 Fc Chimera (Catalog # 4646-VS)

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.

Reconstitution Calculator

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.

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: VSIG4

VSIG4 (V-set and immunoglobulin domain containing 4), also known as CRIg and Z39IG, is a 45 kDa, type I transmembrane protein of the B7 family within the Ig superfamily that is expressed only in tissue-resident macrophages (1‑4). The gene is located on the X chromosome (2). The human VSIG4 cDNA encodes 399 amino acids (aa) including a 19 aa signal sequence, a 264 aa extracellular domain (ECD) containing a V-type and a C2-type Ig domain, a 21 aa transmembrane domain and a 95 aa cytoplasmic domain (3). The human VSIG4 ECD shares 84% aa identity with canine VSIG4. Within the IgV domain, it shares 90%, 80%, and 78% aa identity with bovine, mouse and rat VSIG4, respectively; these animals lack the C2-type domain. Splice isoforms of 321, 305, 272, 201, and 199 aa lack all or part of the cytoplasmic domain, the C2-type Ig domain and/or the transmembrane domain (5). VSIG4 is specifically expressed on macrophages in the thymic medulla, peritoneum, alveoli, synovia, adipose and heart, liver Kupffer cells, placental Hofbauer cells, and atherosclerotic foam cells (1‑4, 6‑9). It is absent on infiltrating macrophages (8). VSIG4 is a complement receptor that binds C3b and iC3b fragments, internalizes them to recycling endosomes, and is recycled to the cell surface (4, 6). It contributes significantly to innate immunity by binding and phagocytosis of complement-opsonized invading pathogens (4, 8, 10). Binding of either native or recombinant soluble VSIG4 to C3b inhibits complement amplification through the alternative, but not classical, pathway (10, 11). VSIG4 is also a negative regulator of mouse and human T cell activation (2). Although VSIG4 engagement may activate NF kappa B and thus be pro-inflammatory in some cases, many of its activities are important in resolving, rather than initiating, inflammation (1, 2, 7, 10, 11).

References

He, J.Q. et al. (2008) Mol. Immunol. 4041.
Vogt, L. et al. (2006) J. Clin. Invest. 116:2817.
Langnaese, K. et al. (2000) Biochim. Biophys. Acta 1492:522.
Helmy, K. et al. (2006) Cell 124:915.
Entrez protein Accession # EAX05393, NP_001093901, CAI42052, CAI4205, EAX05394.
Tanaka, M. et al. (2008) Clin. Exp. Immunol. 154:38.
Lee, M-Y. et al. (2006) J. Leukoc. Biol. 80:922.
Gorgani, N.N. et al. (2008) J. Immunol. 181:7902.
Walker, M.G. (2002) Biochim. Biophys. Acta 1574:387.
Wiesmann, C. et al. (2006) Nature 444:217.
Katschke, K.J. et al. (2007) J. Exp. Med. 204:1319.

Long Name

V-Set and Immunoglobulin Domain Containing 4

Entrez Gene IDs

11326 (Human); 278180 (Mouse); 312102 (Rat); 102144784 (Cynomolgus Monkey)

Alternate Names

CRIg; Ig superfamily protein; Protein Z39Ig; V-set and immunoglobulin domain containing 4; V-set and immunoglobulin domain-containing protein 4; VSIG4; Z39IG; Z39IGcomplement receptor of the immunoglobulin superfamily