title: Baicalein enhances the osteogenic differentiation of human periodontal ligament cells by activating the Wnt/β-catenin signaling pathway.
abstract: OBJECTIVE
  Periodontium regeneration is one of the most important processes for periodontitis therapy. Human periodontal ligament cells (hPDLCs) play a vital role in the repair and regeneration of periodontal tissues. Our study aimed to investigated the mechanisms underlying the promotion of hPLDCs osteogenic differentiation by baicalein.
  
  
  METHODS
  hPDLCs were obtained from periodontal ligament (PDL) tissues by primary culture. The MTT assay was used to determine the growth curves of hPDLCs treated with different concentrations of baicalein (1.25, 2.5, 5, or 10μM). Alkaline phosphatase (ALP) staining and Alizarin red S staining were performed to assess osteogenic differentiation of hPDLCs administered baicalein. Osteogenic differentiation-related gene and protein expression levels and Wnt/β-catenin pathway signal changes were assessed by qRT-PCR and Western blotting analysis.
  
  
  RESULTS
  The results showed that baicalein decreased the growth of hPDLCs slightly and increased ALP activity and calcium deposition in a dose-dependent manner. The expression of runt-related transcription factor 2 (RUNX2), bone morphogenetic protein 2 (BMP2), Osterix (OSX) and osteocalcin (OCN) were elevated after baicalein administration. Moreover, baicalein strongly activated the Wnt/β-catenin pathway and up-regulated the expression of β-catenin, lymphoid enhancer factor 1 (LEF1) and Cyclin D1. Dickkopf-related protein 1 (DKK-1) significantly reversed the effects of baicalein on hPDLCs.
  
  
  CONCLUSIONS
  Our findings indicated that baicalein enhanced the osteogenic differentiation of hPDLCs via the activation of the Wnt/β-catenin signaling pathway, which may represent a potential candidate for periodontitis therapy.
authors.affiliation: Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Li-Jiao
authors.initials: LJ
authors.lastname: Chen
authors.affiliation: Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Bi-Bo
authors.initials: BB
authors.lastname: Hu
authors.affiliation: Department of Periodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Xin-Lian
authors.initials: XL
authors.lastname: Shi
authors.affiliation: Department of Periodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Man-Man
authors.initials: MM
authors.lastname: Ren
authors.affiliation: Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Wen-Bin
authors.initials: WB
authors.lastname: Yu
authors.affiliation: Department of Periodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Sheng-Dan
authors.initials: SD
authors.lastname: Cen
authors.affiliation: Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, China. Electronic address: hurongdang@hotmail.com.
authors.forename: Rong-Dang
authors.initials: RD
authors.lastname: Hu
authors.affiliation: Department of Periodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, China; Department of Orthodontics, School of Dentistry, University of Queensland, Brisbane, Queensland, Australia. Electronic address: dh0726@gmail.com.
authors.forename: Hui
authors.initials: H
authors.lastname: Deng
mesh_terms: D000328:Adult; D000469:Alkaline Phosphatase / Q000378:metabolism; D000975:Antioxidants / Q000494:pharmacology*; D015153:Blotting, Western; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D044950:Flavanones / Q000494:pharmacology*; D006801:Humans; D010012:Osteogenesis / Q000187:drug effects*; D010513:Periodontal Ligament / Q000166:cytology*; D060888:Real-Time Polymerase Chain Reaction; D060449:Wnt Signaling Pathway / Q000502:physiology*
chemical_list: D000975:Antioxidants; D044950:Flavanones; C006680:baicalein; D000469:Alkaline Phosphatase
keywords: Baicalein; Osteogenic differentiation; Periodontal ligament cells; Wnt/β-catenin signaling