title: Expression and localization of laminin 5, laminin 10, type IV collagen, and amelotin in adult murine gingiva.
abstract: The biochemical composition of the internal and external basal laminae in the junctional epithelium differs significantly, and the precise cellular origin of their respective molecules remains to be determined. In the present study, the expression and localization of three basement membrane-specific molecules-laminin 5 (γ2 chain), type IV collagen (α1 chain), and laminin 10 (α5 chain)-and one tooth-specific molecule, amelotin, was analyzed in adult murine gingiva by using in situ hybridization and immunohistochemistry. The results showed that the outermost cells in junctional epithelium facing the tooth enamel strongly expressed laminin 5 mRNA, supporting the immunohistochemical staining data. This suggests that laminin 5 is actively synthesized in junctional epithelial cells and that the products are incorporated into the internal basal lamina to maintain firm epithelial adhesion to the tooth enamel throughout life. Conversely, no amelotin mRNA signals were detected in the junctional epithelial cells, suggesting that the molecules localized on the internal basal lamina are mainly derived from maturation-stage ameloblasts. Weak and sporadic expression of type IV collagen in addition to laminin 10 in the gingiva indicates that these molecules undergo turnover less frequently in adult animals.
authors: Department of Ultrastructural Science, Tokyo Dental College, Misaki-cho 2-9-18, Chiyoda-ku, Tokyo, 101-0061, Japan, sawada@tdc.ac.jp.
authors: Takashi
authors: T
authors: Sawada
authors: Takaki
authors: T
authors: Yamazaki
authors: Kazuko
authors: K
authors: Shibayama
authors: Kaido
authors: K
authors: Kumazawa
authors: Yoko
authors: Y
authors: Yamaguchi
authors: Mitsuhiro
authors: M
authors: Ohshima
mesh_terms: D000818:Animals; D015815:Cell Adhesion Molecules / Q000235:genetics / Q000378:metabolism*; D024141:Collagen Type IV / Q000235:genetics / Q000378:metabolism*; D003746:Dental Enamel Proteins / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D005881:Gingiva / Q000378:metabolism*; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D007797:Laminin / Q000235:genetics / Q000378:metabolism*; D008297:Male; D051379:Mice; D021381:Protein Transport; D000097794:Kalinin
chemical_list: D015815:Cell Adhesion Molecules; D024141:Collagen Type IV; D003746:Dental Enamel Proteins; D007797:Laminin; D000097794:Kalinin; C507066:Amtn protein, mouse; C119013:laminin 10