title: Down-regulation of plasma membranous Annexin A1 protein expression in premalignant and malignant lesions of the oral cavity: correlation with epithelial differentiation.
abstract: OBJECTIVE
  To determine the potential involvement of ANXA1 in oral squamous-cell carcinoma (OSCC), we evaluated the ANXA1 protein expression in oral premalignant lesions (OPLs) and OSCCs and correlated the results with clinicopathologic variables.
  
  
  METHODS
  Matched normal and tumour specimens of 44 primary OSCCs and 28 OPLs were analyzed for ANXA1 subcellular localization and protein expression level by immunohistochemistry (IHC). Correlations between ANXA1-IHC staining scores of OSCCs and clinicopathologic features were evaluated by Fisher's exact test.
  
  
  RESULTS
  Markedly down-regulation of ANXA1 protein expression was identified on the plasma membrane of epithelial cells in OSCCs (P < 0.001) and OPLs (P = 0.001) compared with normal counterparts. Moreover, loss of plasma membranous ANXA1 expression was significantly correlated with the poorly differentiated status of OSCC cells (P = 0.012).
  
  
  CONCLUSIONS
  Our findings suggest that loss of ANXA1 is frequent and early event during oral carcinogenesis and that ANXA1 could contribute to maintaining epithelial differentiation in OSCC.
authors.affiliation: Department of Clinical Molecular Biology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, 260-8670, Japan.
authors.forename: Hitomi
authors.initials: H
authors.lastname: Nomura
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Uzawa
authors.forename: Yukio
authors.initials: Y
authors.lastname: Yamano
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Fushimi
authors.forename: Dai
authors.initials: D
authors.lastname: Nakashima
authors.forename: Yukinao
authors.initials: Y
authors.lastname: Kouzu
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kasamatsu
authors.forename: Katsunori
authors.initials: K
authors.lastname: Ogawara
authors.forename: Masashi
authors.initials: M
authors.lastname: Shiiba
authors.forename: Hiroki
authors.initials: H
authors.lastname: Bukawa
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Yokoe
authors.forename: Hideki
authors.initials: H
authors.lastname: Tanzawa
mesh_terms: D017305:Annexin A1 / Q000378:metabolism*; D002294:Carcinoma, Squamous Cell / Q000378:metabolism* / Q000473:pathology; D002454:Cell Differentiation / Q000502:physiology; D002462:Cell Membrane / Q000378:metabolism; D002467:Cell Nucleus / Q000378:metabolism / Q000473:pathology; D018450:Disease Progression; D015536:Down-Regulation; D004847:Epithelial Cells / Q000378:metabolism / Q000502:physiology*; D006801:Humans; D009055:Mouth / Q000378:metabolism / Q000473:pathology; D009061:Mouth Mucosa / Q000378:metabolism / Q000473:pathology; D009062:Mouth Neoplasms / Q000378:metabolism* / Q000473:pathology; D009367:Neoplasm Staging; D011230:Precancerous Conditions / Q000378:metabolism*
chemical_list: D017305:Annexin A1