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Retinoic acid is a potential negative regulator for differentiation of human periodontal ligament cells.

Abstract：

BACKGROUND AND OBJECTIVES:Retinoic acid (RA) exerts a wide variety of effects on development, cellular differentiation and homeostasis in various tissues. However, little is known about the effects of RA on the differentiation of periodontal ligament cells. In this study, we investigated whether RA can affect the dexamethasone-induced differentiation of periodontal ligament cells. METHODS AND RESULTS:Human periodontal ligament cells were differentiated via culturing in the presence of dexamethasone, ascorbic acid, and beta-glycerophosphate for mineralized nodule formation, as characterized by von Kossa staining. Continuous treatment with all-trans-RA inhibited the mineralization in a dose-dependent manner, with complete inhibition over 1 microm RA. Other RA analogs, 9-cis-RA and 13-cis-RA, were also effective. Furthermore, addition of RA for just the first 4 days completely inhibited the mineralization; however, as RA was added at later stages of culture, the inhibitory effect was diminished, suggesting that RA had a phase-dependent inhibition of mineralization. RA receptor (RAR)-alpha agonist (AM-580), but not retinoid X receptor agonist (methoprene acid), inhibited the mineralization, and reverse transcription-polymerase chain reaction analysis revealed that RAR-alpha was expressed on the cells, suggesting that RAR-alpha was involved in the inhibitory mechanism. This inhibition was accompanied by inhibition of alkaline phosphatase activity; however, neither expression of platelet-derived growth factor (PDGF) receptor-alpha, PDGF receptor-beta, or epidermal growth factor (EGF) receptor, nor phosphorylation of extracellular signal-regulated kinases triggered by PDGF-ascorbic acid or PDGF-BB was changed, as assessed by flow cytometry or western blot analyses. CONCLUSIONS:These findings suggest that RA is a potential negative regulator for differentiation of human periodontal ligament cells.

journal_name

J Periodontal Res

journal_title

Journal of periodontal research

authors

Shibuya N,Nemoto E,Kanaya S,Kunii R,Shimauchi H

doi

10.1111/j.1600-0765.2005.00811.x

subject

Has Abstract

pub_date

2005-12-01 00:00:00

pages

432-40

issue

6

eissn

0022-3484

issn

1600-0765

pii

JRE811

journal_volume

40

pub_type

杂志文章

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