S100A8 Antibody (749916) [Alexa Fluor® 750]

• Applications: WB, IHC
• Clone: 749916
• Clonality: Monoclonal
• Host: Mouse
• Conjugate: Alexa Fluor 750

S100A8 Antibody (749916) [Alexa Fluor® 750] Summary

• Immunogen: E. coli-derived recombinant human S100A8
  Met1-Glu93
  Accession # P05109
• Specificity: Detects human S100A8 in direct ELISAs. In direct ELISAs, 100% cross-reactivity with recombinant human (rh) S100A8/A9 is observed and no cross-reactivity with rhS100A9, recombinant mouse (rm) S100A8, rmS100A9, or rmS100A8/A9 is observed.
• Isotype: IgG1
• Clonality: Monoclonal
• Host: Mouse
• Purity Statement: Protein A or G purified

Packaging, Storage & Formulations

• Storage: Protect from light. Do not freeze. 12 months from date of receipt, 2 to 8 °C as supplied
• Buffer: Supplied 0.2mg/ml in 1X PBS with RDF1 and 0.09% Sodium Azide

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Background

S100A8 (also known as MRP8 and calgranulin A) is a 10 kDa member of the S100 family, EF-hand superfamily of Ca-binding proteins. It is produced by neutrophils and monocytes, and forms Ca‑dependent heterodimer/heterotetramer complexes (termed calprotectin) with S100A9. It functions both intracellularly and extracellularly, where it binds to RAGE and CD36. Human S100A8 is 93 amino acids (aa) in length. It contains two EF-hand motifs (aa 12-47 and 46-81) and one high-affinity Ca‑binding site (aa 59-70). There may be one splice form that shows a 15 aa substitution for the C-terminal 14 amino acids. Although mouse S100A8 is cleaved by MMP‑2 after Asn21, it is unclear if human S100A8 is susceptible. Full-length human S100A8 is 57% and 74% aa identical to mouse and canine S100A8, respectively.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

FAQs for S100A8 Antibody (FAB4570S). (Showing 1 - 2 of 2 FAQ).

1. Have any of your MRP8 antibodies been tested for use in neutralization, or blocking assays, on human samples?
   • Unfortunately at this time we have not tested, or received customer feedback on our MMP8 antibodies for use in blocking or neutralizing assays. If you were planning on testing any of our MMP8 antibodies for neutralizing or blocking capabilities, we would recommend our Innovator’s Reward Program. Under the terms of this program we would be happy to provide a credit for a free vial in exchange for new data on this previously untested or reported application. Please submit this data in the form of an online review. Additional Innovators Reward Program information can be found using this link.
2. We would like to stain paraffin embedded human intestinal tissue for Calprotectin. One question will be which cells express the majority of Calprotectin - invading neutrophils vs epithelium for example. The antibody list you provide is quite extensive. Which antibody would you recommend for our purpose? Which tissue would you recommend as positive control.
   • Nine of our antibodies to Calprotectin have been validated for IHC-P with human tissue, and you can see all of these products. A number of our IHC images were generated using human spleen samples, and as such this may be a good choice of a positive control tissue. We do sell a human spleen slide product, which is suitable for IHC-P. Unfortunately I do not have an in-depth knowledge of Calprotectin, however the image shown for our antibody with catalogue number NBP1-02826 demonstrates clear staining of neutrophils. The following paper also suggests that the protein is abundant in neutrophils: PMID 11435495.