中国组织工程研究 ›› 2015, Vol. 19 ›› Issue (39): 6240-6245.doi: 10.3969/j.issn.2095-4344.2015.39.002

• 人工假体 artificial prosthesis • 上一篇    下一篇

构建膝关节假体感染兔模型:体内环境因素对表皮葡萄球菌及生物膜的影响

申友亮1,朱同娥1,张靖靖1,戚  超2,于腾波2   

  1. 1青岛市胶州中心医院,山东省青岛市  266300;2青岛大学医学院附属医院关节外科,山东省青岛市  266000
  • 出版日期:2015-09-24 发布日期:2015-09-24
  • 通讯作者: 于腾波,教授,博士生导师,青岛大学医学院附属医院关节外科,山东省青岛市 266000
  • 作者简介:申友亮,男,1984年生,山东省莒县人,汉族,2012年青岛大学毕业,硕士,医师,主要从事关节外科方面的研究。
  • 基金资助:

    山东省科技发展计划项目(2010GWZ20225)

Construction of a rabbit model of knee prosthesis infection: environmental factors in vivo affect Staphylococcus epidermidis and biofilms

Shen You-liang1, Zhu Tong-e1, Zhang Jing-jing1, Qi Chao2, Yu Teng-bo2   

  1. 1Jiaozhou Center Hospital, Qingdao 266300, Shandong Province, China; 2Department of Joint Surgery, the Affiliated Hospital of Medical College, Qingdao University, Qingdao 266000, Shandong Province, China
  • Online:2015-09-24 Published:2015-09-24
  • Contact: Yu Teng-bo, Professor, Doctoral supervisor, Department of Joint Surgery, the Affiliated Hospital of Medical College, Qingdao University, Qingdao 266000, Shandong Province, China
  • About author:Shen You-liang, Master, Physician, Jiaozhou Center Hospital, Qingdao 266300, Shandong Province, China
  • Supported by:

    the Science and Technology Development Project of Shandong Province, No. 2010GWZ20225

摘要:

背景:细菌生物膜是导致假体感染难以治愈的主要原因。体外实验研究证实高渗氯化钠、乙醇能够明显促进葡萄球菌生物膜的形成,而关于体内假体周围乙醇、高渗环境对生物膜形成的影响未见报道。
目的:探讨假体周围不同环境因素对关节置换后假体感染表皮葡萄球菌生长和生物膜形成的影响。
方法:构建关节假体表皮葡萄球菌感染的大白兔模型,分为高渗氯化钠组、乙醇组和对照组,每组15只。高渗氯化钠组、乙醇组注入细菌的同时分别加入0.1 mL 4%的氯化钠和体积分数4%的乙醇溶液,对照组注入0.1 mL 0.9%的氯化钠溶液。造模成功后于接种细菌后第2,4,6,8和16 天分别处死3只大白兔,留取关节液、假体和感染周围组织。分离培养细菌提取总RNA于基因水平检测ica操纵子转录水平,以扫描电镜观察假体表面细菌黏附情况,应用苏木精-伊红染色观察假体周围感染组织。
结果与结论:假体周围组织学观察结果显示,高渗氯化钠组注入细菌后第4天所有动物假体周围组织有炎细胞浸润并于第16天时观察到菌落形成。乙醇组和对照组于第6天发现有炎性浸润。扫描电镜观察到第6,8和16天高渗氯化钠组和乙醇组与对照组相比,假体表面黏附细菌逐渐增加,差异有显著性意义(P < 0.05)。注入细菌后第6,8和16天icaA mRNA在高渗氯化钠组和乙醇组的表达明显高于对照组,差异有显著性意义(P < 0.05)。提示关节置换后假体周围环境因素的改变能够影响表皮葡萄球菌的生长以及生物膜的形成。

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

关键词: 骨科植入物, 人工假体, 生物膜, 人工关节, 感染, 表皮葡萄球菌, 体内环境因素

Abstract:

BACKGROUND: Bacterial biofilm is the main cause of the infection of the prosthesis. In vitro experiments confirmed that hypertonic sodium chloride and ethanol can apparently promote the formation of staphylococcal biofilms. There are no reports on the effects of ethanol and hypertonic environment surrounding the prosthesis on the formation of biofilms.
OBJECTIVE: To evaluate the effects of different environment factors surrounding the prosthesis on the growth of Staphylococcus epidermidis and bacterial biofilm formation after replacement.
METHODS: White rabbit models infected with Staphylococcus epidermidis on the prosthesis were established, and were randomly divided into hypertonic sodium chloride, ethanol and control groups (n=15). The bacteria were injected with 0.1 mL 4% sodium chloride and 4% ethanol into the knee of rabbits in the hypertonic sodium chloride  
and ethanol groups. The rabbits were injected with 0.1 mL 0.9% sodium chloride in the control group. Three rabbits were sacrificed at 2, 4, 6, 8 and 16 days after inoculated with bacteria. Synovial fluid, prosthesis and tissue surrounding infection were obtained. Bacterium was cultured to extract total RNA. The ica operon transcription levels were detected in the gene levels. Adhesion of bacteria on the surface of the prosthesis was observed using a scanning electron microscope. Tissues surrounding the prosthesis were observed using hematoxylin-eosin staining.
RESULTS AND CONCLUSION: Histological examination revealed that inflammatory cell infiltration was observed in all the rabbits at 4 days after injection. Colony formation was found at 16 days after injection. At 6 days after injection, inflammatory cell infiltration was observed in the ethanol and control groups. Scanning electron microscope showed that compared with the control group, the bacteria adhered to the prosthetic surface became more in the hypertonic sodium chloride and ethanol groups at 6, 8 and 16 days (P < 0.05). At 6, 8 and 16 days, the expression of icaA mRNA was significantly higher in the hypertonic sodium chloride and ethanol groups than in the control group (P < 0.05). These data showed that the environment factors could affect the growth of Staphylococcus epidermidis and bacterial biofilm formation.

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

Key words: Prosthesis Implantation, Infection, Biofilms, Staphylococcus epidermidis

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