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- Table of Contents
2 Citations 18 Q&As
Facts about Protein S100-A8.
Predominantly found as calprotectin (S100A8/A9) that has a wide plethora of intra- and extracellular functions. The intracellular functions include: facilitating leukocyte arachidonic acid trafficking and metabolism, modulation of the tubulin-dependent cytoskeleton during migration of phagocytes and activation of the neutrophilic NADPH-oxidase.
Human | |
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Gene Name: | S100A8 |
Uniprot: | P05109 |
Entrez: | 6279 |
Belongs to: |
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S-100 family |
60B8AG; CAGACP-10; Calgranulin A; calgranulin-A; Calprotectin L1L subunit; CFAG; CFAGL1Ag; CGLA; Cystic fibrosis antigen; Leukocyte L1 complex light chain; MA387; MIF; Migration inhibitory factor-related protein 8; MRP8; MRP-8; MRP8S100 calcium binding protein A8 (calgranulin A); NIF; P8; protein S100-A8; S100 calcium binding protein A8; S100 calcium-binding protein A8 (calgranulin A); S100 calcium-binding protein A8; S100A8; Urinary stone protein band A
Mass (kDA):
10.835 kDA
Human | |
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Location: | 1q21.3 |
Sequence: | 1; NC_000001.11 (153390032..153422583, complement) |
Calprotectin (S100A8/9) is predominantly expressed in myeloid cells. Except for inflammatory conditions, the expression is restricted to a specific stage of myeloid differentiation since both proteins are expressed in circulating neutrophils and monocytes but are absent in normal tissue macrophages and lymphocytes. Under chronic inflammatory conditions, such as psoriasis and malignant disorders, also expressed in the epidermis. Found in high concentrations at local sites of inflammation or in the serum of patients with inflammatory diseases such as rheumatoid, cystic fibrosis, inflammatory bowel disease, Crohn's disease, giant cell arteritis, cystic fibrosis, Sjogren's syndrome, systemic lupus erythematosus, and progressive systemic sclerosis. Involved in the formation and deposition of amyloids in the aging prostate known as corpora amylacea inclusions. Strongly up-regulated in many tumors, including gastric, esophageal, colon, pancreatic, bladder, ovarian, thyroid, breast and skin cancers.
Secreted. Cytoplasm. Cytoplasm, cytoskeleton. Cell membrane; Peripheral membrane protein. Predominantly localized in the cytoplasm. Upon elevation of the intracellular calcium level, translocated from the cytoplasm to the cytoskeleton and the cell membrane. Upon neutrophil activation or endothelial adhesion of monocytes, is secreted via a microtubule-mediated, alternative pathway.
PMID: 3561500 by Dorin J.R., et al. A clue to the basic defect in cystic fibrosis from cloning the CF antigen gene.
PMID: 3313057 by Odink K., et al. Two calcium-binding proteins in infiltrate macrophages of rheumatoid arthritis.
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