title: Expression of extracellular matrix proteins in ameloblastomas and adenomatoid odontogenic tumors.
abstract: This study evaluated the expression of fibronectin, tenascin and type I collagen in ameloblastomas and adenomatoid odontogenic tumors (AOTs) aiming to contribute with the comprehension of the differences in the biological behavior of these tumors. Immunohistochemical technique was performed in 20 cases of ameloblastoma (16 solid and 4 desmoplastic) and in 10 cases of AOT. All tumors presented moderate fibronectin expression in the stroma. Solid ameloblastomas showed intense expression of fibronectin at the epithelial-mesenchymal interface, whereas desmoplastic ameloblastomas revealed no immunoexpression of fibronectin at this site. Ameloblastomas presented stronger immunoreactivity to tenascin than AOTs, especially at the epithelial-mesenchymal interface. AOTs and desmoplastic ameloblastomas showed intense labeling for type I collagen. The patterns of expression of the proteins studied agree with the locally more invasive behavior of ameloblastomas in comparison to AOTs. Our results might suggest a less invasive behavior of desmoplastic ameloblastoma in comparison to solid ameloblastoma.
authors.affiliation: Department of Oral Pathology, School of Dentistry, Federal University of Rio Grande do Norte, Natal, RN, Brazil.
authors.forename: Ana Miryam Costa
authors.initials: AM
authors.lastname: de Medeiros
authors.forename: Cassiano Francisco Weege
authors.initials: CF
authors.lastname: Nonaka
authors.forename: Hébel Cavalcanti
authors.initials: HC
authors.lastname: Galvão
authors.forename: Lélia Batista
authors.initials: LB
authors.lastname: de Souza
authors.forename: Roseana de Almeida
authors.initials: Rde A
authors.lastname: Freitas
mesh_terms: D018254:Adenomatoid Tumor / Q000378:metabolism* / Q000473:pathology; D000564:Ameloblastoma / Q000378:metabolism* / Q000473:pathology; D014408:Biomarkers, Tumor / Q000096:biosynthesis; D024042:Collagen Type I / Q000096:biosynthesis*; D016326:Extracellular Matrix Proteins / Q000096:biosynthesis; D005353:Fibronectins / Q000096:biosynthesis*; D006801:Humans; D007150:Immunohistochemistry; D007573:Jaw Neoplasms / Q000378:metabolism* / Q000473:pathology; D009808:Odontogenic Tumors / Q000378:metabolism* / Q000473:pathology; D011379:Prognosis; D019063:Tenascin / Q000096:biosynthesis*
chemical_list: D014408:Biomarkers, Tumor; D024042:Collagen Type I; D016326:Extracellular Matrix Proteins; D005353:Fibronectins; D019063:Tenascin