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Symbol S100A9 contributors: mct/npt - updated : 23-02-2016
HGNC name S100 calcium binding protein A9
HGNC id 10499
Location 1q21.3      Physical location : 153.330.329 - 153.333.502
Genatlas name calprotectin
Synonym name
  • cystic fibrosis associated antigen, myeloid-related protein 14
  • S100 calcium binding protein A9 (calgranulin B)
  • migration inhibitory factor-related protein 14
  • leukocyte L1 complex heavy chain
  • calprotectin L1H subunit
  • calgranulin B
  • Synonym symbol(s) CAGB, CFAG, MRP14, MIF, L1AG, NIF, S109, 60B8AG, CGLB, LIAG, MAC387, P14
    TYPE functioning gene
    SPECIAL FEATURE component of a cluster
    STRUCTURE 3.17 kb     3 Exon(s)
    Genomic sequence alignment details
    10 Kb 5' upstream gene genomic sequence study
    regulatory sequence Binding site   transcription factor
    text structure
  • TP53 binding sites in the promoter
  • MAPPING cloned Y linked N status confirmed
    Map see EDC@
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    3 - 586 13.11 114 - 2009 19122197
    Type widely
       expressed in (based on citations)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Lymphoid/Immunespleen   highly
    Respiratorylung   highly
    Skin/Tegumentskin     Homo sapiens
    SystemTissueTissue level 1Tissue level 2LevelPubmedSpeciesStageRna symbol
    Blood / Hematopoieticbone marrow   
    Epithelialbarrier liningepidermis   Homo sapiens
    SystemCellPubmedSpeciesStageRna symbol
    Blood/Hematopoieticmonocyte Homo sapiens
    Blood/Hematopoieticneutrophil Homo sapiens
    Lymphoid/Immunemacrophage Homo sapiens
    Skin/Tegumentkeratinocyte Homo sapiens
    cell lineage
    cell lines
    at STAGE
  • two calcium binding domains with an EF-hand motif
  • one S100 specific Nter
  • one classical Cter
  • a central core polypeptide domain of S100A9 in the calprotectin complex that plays a crucial role in epithelial resistance to bacterial invasion (Champaiboon 2009)
  • mono polymer homomer , heteromer , dimer
    interspecies homolog to murine S100a9
  • S100 family
  • CATEGORY adhesion , regulatory
    basic FUNCTION
  • involved in the regulation of a number of cellular processes such as cell cycle progression and differentiation
  • playing a role in the development of epithelial skin tumors
  • playing a role in the inflammatory response to lipopolysaccharide by inducing the release of neutrophils from the bone marrow and directing their migration to the inflammatory site
  • induced adhesion only to fibronectin
  • stimulated neutrophil adhesion to this extracellular matrix protein
  • playing a a pivotal role during sepsis
  • potential role for pro-inflammatory S100A9 and S100A12 in pathogenesis caused by inflammation and protein complex formation in Alzheimer disease (AD)
  • S100A8/S100A9 levels are likely to be maintained in conditions where IL10 is raised, and these proteins may contribute to viral persistence in patients infected by some RNA viruses
  • TP53 transcriptional target, inducing cellular apoptosis in a partly TP53-dependent manner and mediating the TP53 apoptosis pathway (Li 2009)
  • bacterial flagellin induces the upregulation of S100A8/S100A9 via a TLR5-dependent mechanism in epidermal keratinocytes (PMID/
  • pivotal roles of S100A8 and S100A9 in the propagation of inflammation and keratinocyte proliferation in psoriasis
  • S100A8 and S100A9 themselves function as pro-angiogenic and chemotactic factors, generating a psoriatic milieu in skin
  • S100A8 and/or S100A9 promote endothelial cell proliferation, survival, and angiogenesis both directly and by inducing keratinocytes to produce pro-angiogenic cytokines
  • S100A8 and/or S100A9 promote endothelial cell proliferation, survival, and angiogenesis both directly and by inducing keratinocytes to produce pro-angiogenic cytokines
  • S100A8 and S100A9 are Ca(2+)-binding proteins that are associated with acute and chronic inflammation and cancer
  • S100A8/A9 (calprotectin) negatively regulates G2/M cell cycle progression and growth of squamous cell carcinoma
  • role for S100A8 and S100A9 in redox-sensitive biological responses, including pro-inflammatory cytokine secretion (
  • has a protective role in inflammation-induced skin carcinogenesis
  • S100A8/A9 (calprotectin) and S100A12 proinflammatory mediators are found at inflammatory sites and in the serum of patients with inflammatory or autoimmune diseases
    a component
  • constituent of epidermal differentiation complex
  • heterodimerizing with S100A8 for NADPH oxidase activation in neutrophils, S100A8/S100A9-heterodimer calprotectin are formed in the absence of calcium, tetramerization is strictly calcium-dependent
    small molecule metal binding,
  • Ca2+
  • protein
  • interacting with S100A8 (S100A8-S100A9 complexes amplify the endotoxin-triggered inflammatory responses of phagocytes)
  • S100A8 and S100A9 interact non-covalently, and that they function coordinately and/or independently as homodimers or heterodimers, depending on the microenvironment
  • functional partner for NADPH oxidase activation contrary to S100A9, however, the loading with calcium and a combination with phosphorylated S100A9 are essential
  • S100A12, S100A8, S100A9 has no direct effect on cholesterol efflux in macrophages, but rather promotes the secretion of IL22, which then directly reduces cholesterol efflux in macrophages by decreasing the expression of ABCG1
  • S100A9 protein is a critical regulator of TLR3 trafficking
  • CD14 is a co-receptor of TLR4 in the S100A9-induced cytokine response
  • S100A9, a negative regulator of myeloid cell differentiation, was transrepressed by the IRF7 protein
  • cell & other
    corresponding disease(s)
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    constitutional     --over  
    in ulcerative colitis and Crohn's disease and psoriasis
    tumoral     --low  
    in squamous cell carcinoma of the head and neck, also oesophageal
    constitutional     --over  
    in numerous inflammatory diseases, such as sepsis, rheumatoid arthritis, inflammatory bowel disease, vasculitis and cancer
    constitutional     --over  
    from keratinocytes in psoriatic lesions
    tumoral     --over  
    elevated levels of S100A8 or A9 in the ductal fluid, a near absence of pancreatic enzymes, and high levels of mucins were found to have significantly worse prognosis in pancreatic cancer
    constitutional     --over  
    overexpression of S100A8-S100A9 in neurons is an early step in oncogenic KRAS-induced gliosis
    Variant & Polymorphism
    Candidate gene
  • S100A8 and S100A9 may serve as biomarkers for the detection of renal cell carcinoma
  • potential marker of disease activity in patients with psoriatic arthritis
  • Therapy target
    inhibiting S100A8 and/or S100A9 may be a novel therapy targeting various molecular events involved in the initiation of psoriasis
  • S100a9(-/-) mouse is viable and phenotypically normal