Estrogen deficiency affects tooth formation and gene expression in the odontogenic region of female rats.

Autor: Küchler EC; Department of Orthodontics, University of Regensburg, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany; Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Avenida do Café, Ribeirão Preto, SP 14040-904, Brazil., de Lara RM; Private Practice, Curitiba, PR 80060-000, Brazil., Omori MA; Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Avenida do Café, Ribeirão Preto, SP 14040-904, Brazil., Schröder A; Department of Orthodontics, University of Regensburg, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany., Teodoro VB; Private Practice, Curitiba, PR 80060-000, Brazil., Baratto-Filho F; School of Dentistry, Univille University, R. Paulo Malschitzki, Joinville, SC 89219-710, Brazil., Léon JE; Department of Pathology and Forensic Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil., Proff P; Department of Orthodontics, University of Regensburg, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany., Madalena IR; Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Avenida do Café, Ribeirão Preto, SP 14040-904, Brazil., Kirschneck C; Department of Orthodontics, University of Regensburg, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany. Electronic address: christian.kirschneck@klinik.uniregensburg.de.
Jazyk: angličtina
Zdroj: Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft [Ann Anat] 2021 Jul; Vol. 236, pp. 151702. Date of Electronic Publication: 2021 Feb 16.
DOI: 10.1016/j.aanat.2021.151702
Abstrakt: Background: There is some evidence that estrogen regulates the expression of several genes in different cells, including dental cells. Therefore, the aim of this study was to investigate the role of estrogen deficiency during tooth development regarding tooth structure morphology and its impact on the expression of odontogenesis-related genes.
Methods: A total of 40 female Wistar rats was divided into OVX (estrogen deficiency) and Sham (control) groups. Bilateral ovariectomy was performed in the OVX group, while Sham surgery was performed in the control group at the age of 21 days. At an age of 56 days, 16 rats were euthanized for gene expression analyses of Bmp4, Smad6, Tgfb1 and Runx2. At the age of 63 days, the remaining rats were euthanized for histological and morphometric analyses of teeth. The mandibles of the rats were submitted to μCT analysis. Tooth structures (enamel, dentin and dental pulp) were analyzed. T test was used to compare the mean differences between groups (p<0.05).
Results: In the μCT analysis, enamel and dentin thickness were significantly increased in the control group (p<0.0001). Pulp dimensions were significantly larger in the OVX group (p<0.0001). A reduction of tooth structures in the OVX group was confirmed in HE staining. Smad6 was differentially expressed in the OVX group (p=0.04).
Conclusion: Estrogen deficiency affects gene expression in the odontogenic region and tooth structure morphology.
(Copyright © 2021 Elsevier GmbH. All rights reserved.)
Databáze: MEDLINE
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