Chinese Journal of Tissue Engineering Research ›› 2014, Vol. 18 ›› Issue (52): 8420-8425.doi: 10.3969/j.issn.2095-4344.2014.52.011

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Adhesion ability and biofilm formation of Mycobacterium tuberculosis in the interface of polyethylene

Xiong Qing-guang1, Wang Yong-qing1, Zhao Zhi-hui1, Bi Hong-bin2, Sun Jin-bao1, Zhang Qing-jie2, Hao Xiao-hui1, Li Yi1   

  1. 1Department of Orthopedics, the Fourth Central Clinical College, Tianjin Medical University, Tianjin 300140, China; 2Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
  • Revised:2014-11-12 Online:2014-12-17 Published:2014-12-17
  • Contact: Wang Yong-qing, Professor, Chief physician, Master’s supervisor, Doctoral supervisor, Department of Orthopedics, the Fourth Central Clinical College, Tianjin Medical University, Tianjin 300140, China
  • About author:Xiong Qing-guang, Studying for master’s degree, Department of Orthopedics, the Fourth Central Clinical College, Tianjin Medical University, Tianjin 300140, China
  • Supported by:

    Science and Technology Foundation of Tianjin Bureau of Public Health, No. 2013KY05

Abstract:

BACKGROUND: Studies have confirmed that there is no biofilm formation and lower adhesion ability of Mycobacterium tuberculosis in the interface of vitallium, but it has not been reported about biofilm formation and adhesion ability in the polyethylene.

OBJECTIVE: To observe the adhesion ability and biofilm formation of Mycobacterium tuberculosis on the polyethylene before and after rifampicin intervention.
METHODS: Under sterile conditions, polyethylene and vitallium samples were respectively placed in Middlebrook 7H9 culture medium to be co-cultured with Mycobacterium tuberculosis for 2 weeks. Then, two pieces of samples were taken randomly and cultured in 1 mg/L rifampicin (2 mL) for 2 weeks. The number of colonies and colony thickness in the unit area in the material interface were measured by confocal laser scanning microscope, and the structure of biofilms was observed by scanning electron microscope before and after rifampicin intervention.
RESULTS AND CONCLUSION: The colony thickness and the number of colonies in the unit area was significantly more in the polyethylene group than in the vitallium group before intervention (P < 0.05), but after intervention, these two indexes were reduced significantly in the polyethylene group (P < 0.05). Before rifampicin intervention, Mycobacterium tuberculosis was adherent to the polyethylene interface in a snowflake-like or nebulous shape, and biofilm structure was visible; in the vitallium interface, there were scattered colonies of Mycobacterium tuberculosis, but no biofilm formation. After rifampicin intervention, the number of colonies adhered in the polyethylene interface was reduced, Mycobacterium tuberculosis appeared to be shriveled and cleaved partially, and the biofilms exhibited varying degrees of damage; in the vitallium interface, there were no colonies, but single Mycobacterium tuberculosis was occasionally adherent to the polyethylene interface, and there was no biofilm formation. These findings indicate that Mycobacterium tuberculosis can form a biofilm in the polyethylene interface, but rifampin can inhibit and even destroy the biofilm of Mycobacterium tuberculosis.

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程


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Key words: polyethylene, vitallium, Mycobacterium tuberculosis, rifampin

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