title: Differential expression of cyclophilin A and EMMPRIN in developing molars of rats.
abstract: A complex and intricate cascade of gene expression is essential for late stage tooth development. This study was performed to detect molecules involved in dental hard tissue formation and tooth eruption by comparing gene expression in cap stage molar germs (before eruptive movement and dental hard tissue formation) with that in root formation stage molar germs (after eruptive movement and dental hard tissue formation). DD-PCR revealed that cyclophilin A (Cyp-A), a potent chemoattractant for monocytes as well as a ligand for extracellular matrix metalloproteinase inducer (EMMPRIN) was expressed differentially in the two stages molar germs. The levels of Cyp-A and EMMPRIN mRNA were significantly higher at the root formation stage than at the cap and crown stages of the molar germs. Immunofluorescence showed that Cyp-A and EMMPRIN were expressed strongly in the follicular cells overlaying the occlusal region of the molar germs at the root formation stage. In contrast, their immunoreactivity was weak in the follicular tissues and was not region-specific in molar germs at the cap stage. In addition, the MCP-1 and CSF-1 mRNA levels increased in parallel to that of Cyp-A mRNA and the increased number of osteoclasts at the occlusal region. Immunoreactivity against Cyp-A and EMMPRIN was also observed in the fully differentiated ameloblasts and odontoblasts. This study suggests that Cyp-A and EMMPRIN play roles in the maturation of dental hard tissue and the formation of an eruption pathway.
authors.affiliation: Dental Science Research Institute, Department of Oral Anatomy, School of Dentistry, Chonnam National University, Gwangju, South Korea.
authors.forename: So-Young
authors.initials: SY
authors.lastname: Yang
authors.forename: Byung-Il
authors.initials: BI
authors.lastname: Park
authors.forename: Hyun-Jin
authors.initials: HJ
authors.lastname: Kim
authors.forename: Jee-Hae
authors.initials: JH
authors.lastname: Kang
authors.forename: Na-Ri
authors.initials: NR
authors.lastname: Jung
authors.forename: Ju-Do
authors.initials: JD
authors.lastname: Byun
authors.forename: Min-Seok
authors.initials: MS
authors.lastname: Kim
authors.forename: Ji-Yeon
authors.initials: JY
authors.lastname: Jung
authors.forename: Jung-Tae
authors.initials: JT
authors.lastname: Koh
authors.forename: Won-Jae
authors.initials: WJ
authors.lastname: Kim
authors.forename: Won-Mann
authors.initials: WM
authors.lastname: Oh
authors.forename: Sun-Hun
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000565:Ameloblasts / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn; D051926:Basigin / Q000235:genetics* / Q000378:metabolism; D021984:Cyclophilin A / Q000235:genetics* / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental / Q000235:genetics*; D008963:Molar / Q000254:growth & development* / Q000378:metabolism*; D009804:Odontoblasts / Q000378:metabolism; D010010:Osteoclasts / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D014078:Tooth Eruption / Q000502:physiology*
chemical_list: D051926:Basigin; D021984:Cyclophilin A