title: In situ expression of heat shock proteins, Hsc73, Hsj2 and Hsp86 in the developing tooth germ of mouse lower first molar.
abstract: This study examined the detailed gene expression pattern of three different heat shock proteins (HSPs), Hsc73, Hsj2, and Hsp86, by means of an in situ hybridization method. Hsc73, Hsj2, and Hsp86 were shown in our previous study to be differentially expressed in the mouse embryonic mandible at day 10.5 (E10.5) gestational age. These HSP genes showed similar expression patterns during development of the mouse lower first molar. HSPs-expressing cells were widely distributed in both the epithelial and underlying ectomesenchymal cells at E10.5, and then were slightly localized at E12 in an area where the tooth germ of the lower first molar is estimated to be formed. A strong expression of HSPs was observed in the tooth germ at E13.5. At the cap stage, HSPs were expressed in the enamel organ and dental papilla. At the bell stage, HSPs were distinctly expressed in the inner enamel epithelium and dental papilla cells facing the inner enamel epithelial layer, which later differentiate into ameloblasts and odontoblasts, respectively. This study is the first report in which Hsc73, Hsj2, and Hsp86 were distinctly expressed in the developing tooth germ, thus suggesting these HSPs are related to the development and differentiation of odontogenic cells.
authors.affiliation: Laboratory of Oral Pathology and Medicine, Faculty of Dental Science, Kyushu University 61, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
authors.forename: Hiroko
authors.initials: H
authors.lastname: Wada
authors.forename: Ieyoshi
authors.initials: I
authors.lastname: Kobayashi
authors.forename: Haruyoshi
authors.initials: H
authors.lastname: Yamaza
authors.forename: Kou
authors.initials: K
authors.lastname: Matsuo
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Kiyoshima
authors.forename: Merina
authors.initials: M
authors.lastname: Akhtar
authors.forename: Takako
authors.initials: T
authors.lastname: Sakai
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Koyano
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Sakai
mesh_terms: D000818:Animals; D003743:Dental Enamel / Q000196:embryology; D003771:Dental Papilla / Q000196:embryology; D005260:Female; D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D018841:HSP90 Heat-Shock Proteins / Q000096:biosynthesis / Q000235:genetics; D006360:Heat-Shock Proteins / Q000096:biosynthesis* / Q000235:genetics; D017403:In Situ Hybridization; D051379:Mice; D008807:Mice, Inbred BALB C; D008963:Molar / Q000201:enzymology* / Q000378:metabolism*; D009805:Odontogenesis / Q000502:physiology; D011247:Pregnancy; D014083:Tooth Germ / Q000196:embryology* / Q000378:metabolism*
chemical_list: D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D018841:HSP90 Heat-Shock Proteins; D006360:Heat-Shock Proteins; C494372:Hspa8 protein, mouse; C107835:Hspca protein, mouse