title: Syndecan-1 and Wingless-type protein-1 in human ameloblastomas.
abstract: BACKGROUND
  Aberrant Wingless type 1 glycoprotein (Wnt) pathway in ameloblastomas and a role of syndecan-1 (SDC1) in activating Wnt signalling were perspected. SDC1 shifting from epithelium to stroma was reported in invasive non-odontogenic neoplasms. The aim of this study was to reveal the role of SDC1 and Wnt1 in intraosseous ameloblastomas (IA(s)).
  
  
  METHODS
  SDC1 and Wnt1 expressions were investigated in 29 ameloblastoma subtypes and seven tooth buds.
  
  
  RESULTS
  SDC1 immunostaining strongly depicted stromal cells, extracellular matrix (ECM) and basement membranes of ameloblastomas. It also showed epithelial tumour cells in the acanthomatous and plexiform subtypes, and it often occurred in stellate reticulum cells and basal ameloblasts of tooth buds. Parallel Wnt1 expression occurred in ameloblastomatous epithelial cells, but it was common in basal cells of tooth buds too. Statistically, a significant correlation was found between the percentage of IA(s)-bearing SDC1-positive stromal cells and ECM and the percentage of IA(s)-bearing Wnt1-positive epithelial cells.
  
  
  CONCLUSIONS
  A role of SDC1 in stromal cells and ECM can be hypothesized as a critical factor for carcinogenesis and local invasiveness of IA(s).
authors.affiliation: Dipartimento di Medicina Sperimentale, Università degli Studi di L'Aquila, L'Aquila, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Leocata
authors.forename: D
authors.initials: D
authors.lastname: Villari
authors.forename: C
authors.initials: C
authors.lastname: Fazzari
authors.forename: M
authors.initials: M
authors.lastname: Lentini
authors.forename: C
authors.initials: C
authors.lastname: Fortunato
authors.forename: P A
authors.initials: PA
authors.lastname: Nicòtina
mesh_terms: D000564:Ameloblastoma / Q000145:classification / Q000473:pathology*; D000565:Ameloblasts / Q000473:pathology; D001485:Basement Membrane / Q000473:pathology; D003593:Cytoplasm / Q000648:ultrastructure; D003743:Dental Enamel / Q000473:pathology; D004847:Epithelial Cells / Q000473:pathology; D005109:Extracellular Matrix / Q000737:chemistry; D006801:Humans; D015398:Signal Transduction / Q000502:physiology; D017154:Stromal Cells / Q000473:pathology; D053668:Syndecan-1 / Q000032:analysis*; D014083:Tooth Germ / Q000473:pathology; D051155:Wnt1 Protein / Q000032:analysis*
chemical_list: C508241:SDC1 protein, human; D053668:Syndecan-1; C495247:WNT1 protein, human; D051155:Wnt1 Protein