Intended Use
For In Vitro Diagnostic Use
Summary and Explanation
PAX-7 or Paired Box Gene 7 is a transcription factor coded by a gene on locus 1p36, which can fuse with Forkhead Domain Region (FKHR). PAX-7 protein is involved in developmental pathways in neural tube and mesencephalon formation, muscle cell development, and oxidative stress sensitivity. PAX-7 regulates neural cell adhesion molecules and is expressed in proliferating myoblasts, but it is down-regulated after playing its role in cell differentiation toward muscle-derived specification.
PAX-7 is restricted to muscle satellite and myogenic precursor cells in adults, although it is upregulated in embryonal (ERMS) and alveolar rhabdomyosarcoma (ARMS) and could suggest a de-differentiated cell type when overexpressed in these tumors. Recent studies suggested that PAX-7 antibody is a novel marker, because it was expressed consistently in Ewing sarcoma, in addition to rhabdomyosarcoma and synovial sarcoma. PAX-7 antibody was found expressed in 90% of Ewing sarcomas (90%), mainly in a diffuse and strong manner. Although NKX2-2 showed similar sensitivity, PAX-7 showed more extensive and strong reactivity. ARMS differs from ERMS by virtue of its occurrence in older patients, distinctive pseudoalveolar pattern, usual absence of strap cells, and strong myogenin rather than MyoD1 expression. Identification of a PAX3 or PAX-7/FKHR fusion gene may be necessary for the confident distinction of ARMS from the most primitive forms of ERMS.
Presentation
PAX-7 antibody is a mouse monoclonal antibody derived from cell culture supernatant that is concentrated, dialyzed, filter sterilized and diluted in buffer pH 7.5, containing BSA and sodium azide as a preservative.
Synonyms: pax-7, pax7, pax 7, anti-pax-7, anti-pax7, anti-pax 7, paired box gene 7
