title: Localization of type IV collagen a 1 to a 6 chains in basement membrane during mouse molar germ development.
abstract: The dental basement membrane (BM) putatively mediates epithelial-mesenchymal interactions during tooth morphogenesis and cytodifferentiation. Type IV collagen alpha chains, a major network-forming protein of the dental BM, was studied and results disclosed distinct expression patterns at different stages of mouse molar germ development. At the dental placode and bud stage, the BM of the oral epithelium expressed alpha 1, alpha 2, alpha 5 and alpha 6 chains while the gubernaculum dentis, in addition to the above four chains, also expressed a 4 chain. An asymmetrical expression for alpha 4, alpha 5 and alpha 6 chains was observed at the bud stage. At the early bell stage, the BM associated with the inner enamel epithelium (IEE) of molar germ expressed alpha 1, alpha 2 and alpha 4 chains while the BM of the outer enamel epithelium (OEE) expressed only alpha 1 and a 2 chains. With the onset of dentinogenesis, the collagen a chain profile of the IEE BM gradually disappeared. Howeverfrom the early to late bell stage, the gubernaculum dentis consistently expressed alpha 1, alpha 2, alpha 5 and a 6 chains resembling fetal oral mucosa. These findings suggest that stage- and position-specific distribution of type IV collagen alpha subunits occur during molar germ development and that these changes are essential for molar morphogenesis and cytodifferentiation.
authors.affiliation: Department of Oral Pathology and Medicine, Okayama University, Japan. nori@dent.okayama-u.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Nagai
authors.forename: K
authors.initials: K
authors.lastname: Nakano
authors.forename: Y
authors.initials: Y
authors.lastname: Sado
authors.forename: I
authors.initials: I
authors.lastname: Naito
authors.forename: M
authors.initials: M
authors.lastname: Gunduz
authors.forename: H
authors.initials: H
authors.lastname: Tsujigiwa
authors.forename: H
authors.initials: H
authors.lastname: Nagatsuka
authors.forename: Y
authors.initials: Y
authors.lastname: Ninomiya
authors.forename: C H
authors.initials: CH
authors.lastname: Siar
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D001485:Basement Membrane / Q000737:chemistry / Q000196:embryology* / Q000378:metabolism; D024141:Collagen Type IV / Q000378:metabolism* / Q000493:pharmacokinetics; D004848:Epithelium / Q000378:metabolism*; D005260:Female; D005455:Fluorescent Antibody Technique; D007124:Immunoenzyme Techniques; D051379:Mice; D008813:Mice, Inbred ICR; D008963:Molar / Q000196:embryology* / Q000254:growth & development / Q000378:metabolism; D011247:Pregnancy; D014018:Tissue Distribution; D014083:Tooth Germ / Q000196:embryology* / Q000254:growth & development / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D024141:Collagen Type IV