West China Journal of Stomatology ›› 2017, Vol. 35 ›› Issue (4): 368-372.doi: 10.7518/hxkq.2017.04.005

• Orginal Article • Previous Articles     Next Articles

The effect of Toll-like receptor 4 in nicotine suppressing the osteogenic potential of periodontal ligament stem cells

Luan Yan(), Deqin Yang()   

  1. Dept. of Conservative Dentistry and Endodontics, Stomatological Hospital of Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
  • Received:2017-01-06 Revised:2017-04-02 Online:2017-08-01 Published:2017-08-01
  • Supported by:
    National Natural Science Foundation of China (31571508, 31371473);The Seventh Batch of Key Discipline Construction Project of Chongqing—Endodontics and Operative Dentistry (2011);Key Project of Medical Research Program of Chongqing Municipal Health Bureau (2011-1-062);Science and Technology Project of Yubei District in Chongqing [Yubei Finance and Education (2011) No.33]

Abstract:

Objective To explore the impact of nicotine on proliferation and osteogenic capability of periodontal ligament stem cells (PDLSCs), and the role of Toll-like receptor 4 (TLR4) in nicotine, suppressing the osteogenic capability of PDLSCs. Methods PDLSCs were cultured in vitro, and the flow cytometer was used to identify the surface antigen markers of PDLSCs. WST-1 was used to detect the proliferation ability of PDLSCs, which were stimulated by different concentrations of nicotine. Alizarin red staining was used to observe the formation of mineralized nodules after PDLSCs stimulation with different con-centrations of nicotine. Real-time polymerase chain reaction (RT-PCR) and Western blot were used to detect the change in osteogenic potential of PDLSCs stimulated by nicotine, after TAK-242, and with the inhibitor of TLR4. Results PDLSCs expressed mesenchymal stem cell-associated mar-kers CD90 and CD105. When the concentration of nicotine was 10-4mol·L-1, the PDLSC proliferation could be suppressed after 3 d compared with the control group (P<0.05). The amount of mineralized nodules reduced after osteogenic differentiation at 21 d by alizarin red staining. RT-PCR and Western blot showed the expression levels of alkaline phosphatase (ALP), and osteocalcin (OCN), and the Runt-related transcription factor-2 (Runx-2) were lower than in the control group when nicotine suppressed the PDLSCs (P<0.05). This effect was atte-nuated after TAK-242 was added. Conclusion Nicotine suppresses the proliferation and osteogenic capability of PDLSCs, which may be regulated by TLR4.

Key words: nicotine, periodontal ligament stem cells, Toll-like receptors 4, osteogenic differentiation

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