中国寄生虫学与寄生虫病杂志 ›› 2012, Vol. 30 ›› Issue (3): 9-210-213.

• 实验研究 • 上一篇    下一篇

人型支原体共生与阴道毛滴虫甲硝唑耐药性的关系

王频佳1,谢成彬2 *   

  1. 1 成都医学院检验医学院,成都 610083; 2 四川省妇幼保健院检验科,成都 610031
  • 出版日期:2012-06-30 发布日期:2012-09-28

Mycoplasma hominis Symbiosis and Trichomonas vaginalis Metronidazole Resistance

WANG Pin-jia1,XIE Cheng-bin2 *   

  1. 1  Department of Laboratory Medicine,Chengdu Medical College,Chengdu 610083,China; 2 Clinical Laboratory,Sichuan Provincial Hospital for Women and Children,Chengdu 610031,China
  • Online:2012-06-30 Published:2012-09-28

摘要: 目的  研究人型支原体(Mycoplasma hominis)的共生与阴道毛滴虫(Trichomonas vaginalis)甲硝唑耐药性的关系。  方法  2010年11月至2011年7月,自四川省妇幼保健院妇科门诊患者生殖道分泌物中分离出160株阴道毛滴虫,用梯度浓度1 024、512、256……4、2和1 μg/ml甲硝唑分别处理该批虫株,以死亡率≥90%的最低浓度作为甲硝唑最小致死浓度(MLC)。以160个阴道毛滴虫分离株中提取的DNA为模板,用PCR技术特异性扩增人型支原体16S rRNA基因,检测滴虫细胞内是否有人型支原体共生。对检出人型支原体DNA的分离株用32 μg/ml多西环素清除支原体,比较清除前后甲硝唑MLC的变化。  结果  160个阴道毛滴虫分离株中甲硝唑MLC为1~8 μg/ml的占61.3%(98/160),16~32 μg/ml的占26.3%(42/160),64~256 μg/ml的占12.5%(20/160)。PCR检测结果显示,有61株(38.1%)检出人型支原体DNA,其中MLC为1~8 μg/ml的分离株检出率为13.3%(13/98),16~32 μg/ml的分离株检出率为73.8%(31/42),64~256 μg/ml的分离株检出率为85.0%(17/20),不同MLC范围的分离株人型支原体检出率差异有统计学意义(P<0.01)。用多西环素处理后,61株中仅有8株支原体被清除,清除前后甲硝唑MLC无明显变化。  结论  四川地区的阴道毛滴虫分离株对甲硝唑表现出一定程度的耐药性,人型支原体的共生可能与之有关,但尚未发现直接证据。

关键词: 阴道毛滴虫, 人型支原体, 共生, 甲硝唑, 耐药性

Abstract: Objective   To investigate the relation of Mycoplasma hominis symbiosis and the resistence of Trichomonas vaginalis to metronidazole.  Methods  From November 2010 to July 2011, 160 isolates of T. vaginalis were collected from the genital tract secretion of gynecological out-patients at the Sichuan Provincial Hospital for Women and Children. The minimum lethal concentration (MLC) to metronidazole of these isolates was determined by an in vitro sensitivity assay with different concentration gradients of metronidazole (from 1 to 1 024 μg/ml), and M. hominis DNA in T. vaginalis was detected by polymerase chain reaction (PCR) technique with specific 16S rRNA primers. After clearance of M. hominis from the parasites by 32 μg/ml doxycycline, MLC was determined and compared with that before clearance.  Results  MLC of metronidazole in T. vaginalis ranged from 1 to 256 μg/ml, with 61.3% isolates (98/160) ranging from 1 to 8 μg/ml, 26.3% isolates (42/160) ranging from 16 to 32 μg/ml, and 12.5% isolates (20/160) ranging from 64 to 256 μg/ml. 61 isolates were PCR positive for M. hominis DNA in the 160 isolates of T. vaginalis. The M. hominis DNA positive rate was significantly higher in the T. vaginalis isolates with higher MLC than those isolates with lower MLC (P<0.01). However, when M. hominis was cleared by doxycycline from 8 isolates among the 61 ones, no change was observed in sensitivity of the isolates to metronidazole.  Conclusion  M. hominis symbiosis might be associated with the metronidazole-resistance of T. vaginalis.  However, it needs direct evidence.

Key words: Trichomonas vaginalis, Mycoplasma hominis, Symbiosis, Metronidazole, Drug resistance