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中国防痨杂志 ›› 2012, Vol. 34 ›› Issue (7): 452-454.

• 论著 • 上一篇    下一篇

Mtb耐异烟肼基因变异株的体外最小抑菌浓度研究

张海晴 刘成永 孙庆 张瑞梅 黄海滨 侯远沛 成松   

  1. 221004  江苏徐州市传染病医院结核科
  • 收稿日期:2011-05-12 出版日期:2012-07-10 发布日期:2012-07-06
  • 通信作者: 刘成永 E-mail:liucy0913@126.com

In vitro minimum inhibitory concentration of Mycobacterium tuberculosis isoniazid-resistant gene mutants

ZHANG Hai-qing,LIU Cheng-yong, SUN Qing, ZHANG Rui-mei, HUANG Hai-bin, HOU Yuan-pei,CHENG Song   

  1. Department of Tuberculosis of Xuzhou Infectious Diseases Hospital,Jiangsu Province,Xuzhou 221004,China
  • Received:2011-05-12 Online:2012-07-10 Published:2012-07-06
  • Contact: LIU Cheng-yong E-mail:liucy0913@126.com

摘要: 目的  研究Mtb耐INH临床分离株katG基因、inhA基因、ahpC基因突变对其体外最小抑菌浓度(MIC)的影响。方法  对临床分离的耐INH的160株Mtb及对INH敏感的40株Mtb进行耐药基因芯片检测;并对所有标本进行INH MIC测定,比较不同变异株的MIC结果,其数据采用t检验进行比较,以P<0.05为差异有统计学意义。结果  Mtb耐INH株katG 315基因变异占68.8%(110/160),katG 315基因变异株的MIC为(20.20±19.46 μg/ml),高于inhA变异株(0.73±0.82 μg/ml)(t′=10.9171,tα=1.9807,P<0.05);低于katG 315+inhA变异株(69.33±32.45 μg/ml),(t′= 7.164,tα= 2.0627,P<0.05)。结论  Mtb耐INH基因有不同的突变模式,各模式存在不同的耐药程度,此可以给临床用药进一步提供参考。

关键词: 分枝杆菌,结核, 微生物敏感性试验, 异烟肼, 抗药性,细菌

Abstract: Objective  To study katG, inhA and ahpC mutations of Mycobacterium tuberculosis isoniazid-resistant clinical isolates, and their effect on minimum inhibitory concentration (MIC) in vitroMethods  Isoniazid-resistant genes of 160 Mycobacterium tuberculosis isoniazid-resistant strains and 40 isoniazid-sensitive strains were detected by gene chip. All samples with different gene mutations were determined and compared MICs of isoniazid.  Results  Of isoniazid-resistant strains, 68.8% (110/160) had katG 315 mutations, the MICs of katG 315 gene mutants (20.20±19.46 μg/ml)was significantly higher than inhA gene mutants (0.73±0.82 μg/ml, t′=10.9171, tα=1.9807,P<0.05), and significantly lower than katG 315 plus inhA gene mutants (69.33±32.45 μg/ml, t′= 7.164, tα= 2.0627, P<0.05).  Conclusion  Isoniazid-resistant strains had different gene mutation patterns, different genotypes had different levels of isoniazid resistance, which can provide a reference to the clinical.

Key words: Mycobacterium tuberculosis, Microbial sensitivity tests, Isoniazid, Drug resistance,bacterial