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Human VSIG4 ELISA Pair Set

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Human VSIG4 Materials provided
Capture Ab:1 mg/mL of rabbit anti-VSIG4 monoclonal antibody (in PBS, pH 7.4). Dilute to a working concentration of 2 μg/mL in PBS before coating.
Detection Ab:0.25 mg/mL rabbit anti-VSIG4 monoclonal antibody conjugated to horseradish-peroxidase (HRP) (in PBS, 50 % HRP-protector, pH 7.4). Dilute to working concentration of 0.25 μg/mL in detection antibody dilution buffer before use.
Standard:Each vial contains 100 ng of recombinant VSIG4. Reconstitute with 1 mL detection antibody dilution buffer. After reconstitution, store at -20℃ to -80℃ in a manual defrost freezer. A seven-point standard curve using 2-fold serial dilutions in sample dilution buffer, and a high standard of 2 ng/mL is recommended.
Human VSIG4 Specificity
Human VSIG4 Sensitivity
The minimum detectable dose of Human VSIG4 was determined to be approximately 31.25 pg/ml. This is defined as at least three times standard deviations above the mean optical density of 10 replicates of the zero standard.
Human VSIG4 Principle of the product
The Human VSIG4 ELISA Pair Set is for the quantitative determination of Human VSIG4.
This ELISA Pair Set contains the basic components required for the development of sandwich ELISAs.
The Sino Biological ELISA Pair Set is a solid phase sandwich ELISA (Enzyme-Linked Immunosorbent Assay). It utilizes a monoclonal antibody specific for VSIG4 coated on a 96-well plate. Standards and samples are added to the wells, and any VSIG4 present binds to the immobilized antibody. The wells are washed and a horseradish peroxidase conjugated rabbit anti-VSIG4 monoclonal antibody is then added, producing an antibody-antigen-antibody "sandwich". The wells are again washed and TMB substrate solution is loaded, which produces color in proportion to the amount of VSIG4 present in the sample. To end the enzyme reaction, the stop solution is added and absorbances of the microwell are read at 450 nm.
Human VSIG4 Storage
Capture Antibody: Aliquot and store at -20℃ to -80℃ for up to 6 months from date of receipt. Avoid repeated freeze-thaw cycles.
Detection Antibody: Store at 4℃ and protect it from prolonged exposure to light for up to 6 months from date of receipt. DO NOT FREEZE!
Standard: Store lyophilized Standard at -20℃ to -80℃ for up to 6 months from date of receipt. Aliquot and store the reconstituted Standard at -80℃ for up to 1 month. Avoid repeated freeze-thaw cycles.
VSIG4 Background

VSIG4 (V-set and immunoglobulin domain containing 4), also known as complement receptor of the immunoglobulin superfamily (CRIg) and Z39Ig, is a type I  transmembrane glycoprotein. It is a B7 family-related protein and an Ig superfamily member. In contrast to the B7 family members which contain two IgG domains, VSIG4 contains one complete V-type I g domain and a truncated C-type I g domain. VSIG4 is exclusively expressed on tissue resident macrophages and binds to multimers of C3b and iC3b that are covalently attached to particle surfaces. No VSIG4 expression appears to be present in T and B cells. VSIG4 functions as a negative regulator of T cell activation, and may be involved in the maintenance of peripheral T cell tolerance, and is also identified as a potent suppressor of established inflammation. Mouse VSIG4 is synthesized as a 280 amino acid precursor that contains a signal sequence, an V-type I g domain (aa 36-115), one potential N-linked glycosylation site, and a single transmembrane domain. The V-type I g domain of mouse VSIG4 shares 86% and 80% aa sequence identity with the V-type I g domains of rat and human VSIG4, respectively.

Human VSIG4 References
  • Vogt, L. et al., 2006, J Clin Invest.116: 2817-2826.
  • Helmy, K. et al., 2006, Cell. 124:915-927.
  • Wiesmann, C. et al., 2006, Nature. 444:217-220.
  • Zang,X. et al., 2006, J Clin Invest. 116: 2590-2593.
  • Katschke, KJ. et al., 2007, J. Exp. Med. 204:1319-1325.
  • He,JQ. et al., 2008, Mol Immunol. 45: 4041-4047.
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