Activation of the Wnt/ß-catenin pathway and tissue inhibitor of metalloprotease 1 during tertiary dentinogenesis.
J Biochem
; 153(1): 43-50, 2013 Jan.
Article
em En
| MEDLINE
| ID: mdl-23038674
ABSTRACT
Tertiary dentin is deposited inside teeth after various stimuli and serves as a major defensive wall to preserve pulp cells. However, the molecular mechanisms of the activation of quiescent odontoblasts, immature pulp cells and tertiary dentin formation are still unclear. Therefore, we performed a comprehensive gene expression analysis of pulp cells after cavity preparation of 9-week-old rat molars to clarify the critical molecules in tertiary dentinogenesis. As a result, mRNA expression of various molecules was up- or down-regulated. Notably, several members of the matrix metalloprotease family and their endogenous inhibitors were up-regulated after cavity preparation. In situ hybridization showed that tissue inhibitor of metalloprotease 1 (Timp1) was widely and continuously distributed in the pulp beneath the cavity in vivo. We also observed accumulation of ß-catenin in the pulp cells beneath the cavity by fluorescence immunohistochemistry. Furthermore, Timp1 transcription was repressed by a dominant-negative TCF4 in immature undifferentiated mesenchymal cells, but not altered in mature odontoblast-like cells. These results indicate that cavity preparation may activate the Wnt/ß-catenin pathway and the Wnt/ß-catenin pathway and Timp1 may be correlatively involved in pulp repair. Timp1 might play crucial roles in reactivation of immature pulp cells for tertiary dentinogenesis.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Regulação para Cima
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Inibidor Tecidual de Metaloproteinase-1
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Cárie Dentária
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Polpa Dentária
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Dentina
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Beta Catenina
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Via de Sinalização Wnt
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article