Chinese Journal of Tissue Engineering Research ›› 2013, Vol. 17 ›› Issue (32): 5855-5862.doi: 10.3969/j.issn.2095-4344.2013.32.017

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Periodontal ligament stem cells expansion in vitro under different cryopreservation systems

Wang Xuan1, Liu Yi-shan1, Ma Yan2, Bi Xiao-juan2, Zheng Shu-tao3, Liu Jia1, Li Bo-qi1, Sun Da-lei1, Zhao Jin4   

  1. 1Department of Pediatric Dentistry & Oral Prevention and Health Care, 4Department of Endodontics, First Affiliated Hospital of Xinjiang Medical University, Urumqi  830011, Xinjiang Uygur Autonomous Region, China; 2Stem Cell Research Laboratory, Clinical Medical Research Institute of Xinjiang Medical University, Urumqi  830011, Xinjiang Uygur Autonomous Region, China; 3Clinical Medical Research Institute, State Key Lab Incubation Base of Xinjiang Major Diseases Research, First Affiliated Hospital of Xinjiang Medical University, Urumqi  830011, Xinjiang Uygur Autonomous Region, China
  • Received:2013-05-27 Revised:2013-06-15 Online:2013-08-06 Published:2013-08-06
  • Contact: Zhao Jin, M.D., Chief physician, Professor, Department of Endodontics, First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, Xinjiang Uygur Autonomous Region, China merryljin@sina.com
  • About author:Wang Xuan★, Master, Attending physician, Department of Pediatric Dentistry & Oral Prevention and Health Care, First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, Xinjiang Uygur Autonomous Region, China wangjieqiu126@sina.com
  • Supported by:

    the Natural Science Foundation of Xinjiang Uygur Autonomous Region for the Youth, No. 2013211B58*

Abstract:

BACKGROUND: The cryopreservation is the key step to ensure the successful stem cell transplantation treatment. The traditional cryopreservation is to place the cells directly into the cryopreservation solution, but dimethyl sulfoxide in the cryopreservation liquid likes a double-edged sword during the repeated cryopreservation and recovery process, that is, although dimethyl sulfoxide can reduce the cell membrane mechanical injury by ice crystals in the recovery process, at the same time, it can enhance the toxic effects on cells directly and affect cell survival situation and is not conducive to clinical transplantation therapy. In recent years, extracted stem cells from frozen tissue had become another research direction.
OBJECTIVE: To look for the best solution of periodontal ligament stem cells expansion in vitro by the appropriate cryopreservation periodontal tissue.
METHODS: Periodontal tissue was scraped from healthy human teeth and divided them into three equal parts: fresh group, harvesting periodontal ligament stem cells from fresh tissue; 5% dimethyl sulfoxide group, 5% dimethyl sulfoxide added into the cryopreservation system; 10% dimethyl sulfoxide group, 10% dimethyl sulfoxide added into the cryopreservation system. One month later, periodontal ligament stem cells were extracted from the cryopreserved periodontal ligament from the latter two groups.
RESULTS AND CONCLUSION: In the time that cells swam out of tissue mass and cell harvest amount, the 5% dimethyl sulfoxide group was inferior to the fresh group but better than the 10% dimethyl sulfoxide group (P < 0.05). No differences were found among the three groups in the following aspects (P > 0.05): colony formation rate of passage 1 periodontal ligament stem cells, cell survival rate, proliferation ability of passage 3 periodontal ligament stem cells, cell growth curve and surface marker expression of periodontal ligament stem cells. The results suggest that the 5% dimethyl sulfoxide added cryopreserved system for periodontal ligament tissue cannot only shorten the time of periodontal ligament stem cells amplification in vitro, ensure cell harvest and maintain basic cellular biological characteristics, but also reduce the total amount of the dimethyl sulfoxide and the direct damage to the cells caused by repeatedly frozen cells, thereby providing a more secure guarantee for the future implementation of clinical transplantation therapy. So, the 5% dimethyl sulfoxide added cryopreserved system may be the new selection for donor tissue storage.

Key words: stem cells, stem cell culture and differentiation, periodontal tissue, dimethyl sulfoxide, periodontal ligament stem cells, cell culture, cell cryopreservation, cell proliferation, osteogenic induction, adipogenic induction, provincial grants-supported paper, stem cell photographs-containing paper

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