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Article

Effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts in vitro

  • Authors:
    • Hai-Yuan Zhang
    • Rui Liu
    • Yong-Jun Xing
    • Ping Xu
    • Yan Li
    • Chen-Jun Li
  • View Affiliations / Copyright

    Affiliations: Department of Stomatology, Chengdu Military General Hospital of PLA, Chengdu, Sichuan 610083, P.R. China, Department of Stomatology, Research Institute of Surgery and Daping Hospital, The Third Military Medical University, Chongqing 400042, P.R. China
  • Pages: 1553-1559
    |
    Published online on: October 16, 2013
       https://doi.org/10.3892/etm.2013.1349
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Abstract

This study aimed to investigate the effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts (HPLFs) at various times in vitro in order to further study plateau-hypoxia-induced periodontal disease. HPLFs (fifth passage) cultured by the tissue culture method were assigned to the slight (5% O2), middle (2% O2), and severe hypoxia (1% O2) groups and the control (21% O2) group, respectively. At 12, 24, 48 and 72 h, the proliferation and alkaline phosphatase (ALP) activities were detected. The ultrastructure of the severe hypoxia group was observed. HPLFs grew more rapidly with an increase in the degree of hypoxia at 12 and 24 h, and significant levels of proliferation (P<0.05) were observed in the severe hypoxia group at 24 h. Cell growth was restrained with an increase in the degree of hypoxia at 48 and 72 h, and the restrictions were clear (P<0.05) in the middle and severe hypoxia groups. ALP activity was restrained with increasing hypoxia at each time point. The restrictions were marked (P<0.05) in the severe hypoxia group at 24 h and in the middle and severe hypoxia groups at 48 and 72 h. However, the restriction was more marked (P<0.05) in the severe hypoxia group at 72 h. An increase was observed in the number of mitochondria and rough endoplasmic reticula (RER), with slightly expanded but complete membrane structures, in the severe hypoxia group at 24 h. At 48 h, the number of mitochondria and RER decreased as the mitochondria increased in size. Furthermore, mitochondrial cristae appeared to be vague, and a RER structural disorder was observed. At 72 h, the number of mitochondria and RER decreased further when the mitochondrial cristae were broken, vacuolar degeneration occurred, and the RER particles were reduced while the number of lysosomes increased. HPLF proliferation and mineralization was restrained. Additionally, HPLF structure was broken for a relatively long period of time in the middle and severe hypoxia groups. This finding demonstrated that hypoxia was capable of damaging the metabolism, reconstruction and recovery of HPLFs. The poor state of HPLFs under hypoxic conditions may therefore initiate or aggravate periodontal disease.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang H, Liu R, Xing Y, Xu P, Li Y and Li C: Effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts in vitro. Exp Ther Med 6: 1553-1559, 2013.
APA
Zhang, H., Liu, R., Xing, Y., Xu, P., Li, Y., & Li, C. (2013). Effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts in vitro. Experimental and Therapeutic Medicine, 6, 1553-1559. https://doi.org/10.3892/etm.2013.1349
MLA
Zhang, H., Liu, R., Xing, Y., Xu, P., Li, Y., Li, C."Effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts in vitro". Experimental and Therapeutic Medicine 6.6 (2013): 1553-1559.
Chicago
Zhang, H., Liu, R., Xing, Y., Xu, P., Li, Y., Li, C."Effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts in vitro". Experimental and Therapeutic Medicine 6, no. 6 (2013): 1553-1559. https://doi.org/10.3892/etm.2013.1349
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang H, Liu R, Xing Y, Xu P, Li Y and Li C: Effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts in vitro. Exp Ther Med 6: 1553-1559, 2013.
APA
Zhang, H., Liu, R., Xing, Y., Xu, P., Li, Y., & Li, C. (2013). Effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts in vitro. Experimental and Therapeutic Medicine, 6, 1553-1559. https://doi.org/10.3892/etm.2013.1349
MLA
Zhang, H., Liu, R., Xing, Y., Xu, P., Li, Y., Li, C."Effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts in vitro". Experimental and Therapeutic Medicine 6.6 (2013): 1553-1559.
Chicago
Zhang, H., Liu, R., Xing, Y., Xu, P., Li, Y., Li, C."Effects of hypoxia on the proliferation, mineralization and ultrastructure of human periodontal ligament fibroblasts in vitro". Experimental and Therapeutic Medicine 6, no. 6 (2013): 1553-1559. https://doi.org/10.3892/etm.2013.1349
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