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Up‐regulation of estrogen receptor‐β expression during osteogenic differentiation of human periodontal ligament cells
Author(s) -
Tang X.,
Meng H.,
Han J.,
Zhang L.,
Hou J.,
Zhang F.
Publication year - 2008
Publication title -
journal of periodontal research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.31
H-Index - 83
eISSN - 1600-0765
pISSN - 0022-3484
DOI - 10.1111/j.1600-0765.2007.01031.x
Subject(s) - periodontal fiber , estrogen receptor , estrogen , estrogen receptor beta , endocrinology , medicine , receptor , estrogen receptor alpha , receptor expression , biology , chemistry , microbiology and biotechnology , dentistry , cancer , breast cancer
Background and Objective: Estrogen has been shown to up‐regulate the expression of osteoblastic phenotypes of human periodontal ligament cells via binding to estrogen receptors and may also help periodontal tissue regeneration. However, which subtype of estrogen receptor (α or β) is predominately expressed in human periodontal ligament cells, and how estrogen receptor expression is regulated during the osteogenic differentiation of human periodontal ligament cells, is still unclear. This study aimed to explore the expression and regulation of estrogen receptor subtypes in human periodontal ligament cells and during their osteogenic differentiation. Material and Methods: Human periodontal ligament cells derived from 10 individual age‐matched donors (five male and five female donors) were cultured. Human periodontal ligament cells under osteogenic induction (group M) and the corresponding controls (group C) were harvested on days 7, 14 and 21 for estrogen receptor detection. Results: Both estrogen receptor‐α and estrogen receptor‐β mRNAs were expressed in human periodontal ligament cells from all of the 10 donors. Protein only of estrogen receptor‐β (not of estrogen receptor‐α) was detected and was shown to be located in the nuclei of human periodontal ligament cells. The expression levels of estrogen receptor‐β mRNA and protein from both male and female donors in group M were significantly higher compared with group C during the 21‐d study period. In comparison, the expression level of estrogen receptor‐α mRNA of the donors was not significantly different from that of the controls during osteogenic differentiation and no estrogen receptor‐α protein was detected. Conclusion: The results suggest that estrogen receptor‐β may be the predominant subtype expressed in human periodontal ligament cells and may actively participate in the osteogenic differentiation process of human periodontal ligament cells, both in male and in female subjects.