吉林大学学报(医学版) ›› 2022, Vol. 48 ›› Issue (6): 1389-1394.doi: 10.13481/j.1671-587X.20220603

• 基础研究 • 上一篇    下一篇

blaNDM-1基因敲除对阴沟肠杆菌毒力的影响

代鹏飞,杨恺,杜艳,刘淑敏()   

  1. 昆明医科大学第一附属医院医学检验科 云南省检验医学重点实验室 云南省医学检验 临床医学研究中心,云南 昆明 650032
  • 收稿日期:2022-01-08 出版日期:2022-11-28 发布日期:2022-12-07
  • 通讯作者: 刘淑敏 E-mail:466174813@qq.com
  • 作者简介:代鹏飞(1993-),男,湖北省天门市人,检验技师, 医学硕士,主要从事临床微生物检验方面的研究。
  • 基金资助:
    国家自然科学基金项目(81960382);云南省科技厅应用基础研究计划联合专项(2019FE001-060)

Effect of blaNDM-1 gene knockout on virulence of Enterobacter cloacae

Pengfei DAI,Kai YANG,Yan DU,Shumin LIU()   

  1. Department of Clinical Laboratory,First Affiliated Hospital,Kunming Medical University,Yunnan Key Laboratory of Laboratory Medicine,Yunnan Provincal Clinical Research Center for Laboratory Medicine,Kunming 650032,China
  • Received:2022-01-08 Online:2022-11-28 Published:2022-12-07
  • Contact: Shumin LIU E-mail:466174813@qq.com

摘要:

目的 比较blaNDM-1基因敲除前后阴沟肠杆菌毒力的变化,阐明blaNDM-1基因对其毒力的影响。 方法 将携带blaNDM-1基因的阴沟肠杆菌分为携带耐药基因blaNDM-1的阴沟肠杆菌T2(T2组)、阴沟肠杆菌T2 blaNDM-1基因敲除株(ΔT2组)和阴沟肠杆菌ATCC13047(ST组)。检测各组质粒稳定性、各组阴沟肠杆菌的菌落运动直径、生物膜吸光度(A)值、黏附细菌量、黏附率及侵袭黏附比。 结果 传代200次后,T2组阴沟肠杆菌仍携带blaNDM-1基因,ΔT2和ATCC13047组阴沟肠杆菌不携带blaNDM-1基因;T2组阴沟肠杆菌仅携带碳青霉烯类耐药基因blaNDM-1,其他碳青霉烯类耐药基因blaKPC-2、blaIMP-4、blaVIM-1和blaOXA-48均为阴性;ΔT2和ST组所检测的5种碳青霉烯类耐药基因均为阴性,T2与ΔT2组阴沟肠杆菌携带相同的毒力基因clpB、icmf和acrA。T2组菌落运动直径小于ΔT2和ST组(P<0.05)。与T2组比较,ΔT2组生物膜A值升高,但差异无统计学意义(P>0.05)。与T2组比较,ΔT2组黏附细菌量降低,但差异无统计学意义(P>0.05)。共培养24 h后,T2组和ΔT2组RAW264.7细胞的黏附率和侵袭黏附比低于ST组(P<0.05)。 结论 blaNDM-1基因未明显增加阴沟肠杆菌的毒力。

关键词: 阴沟肠杆菌, blaNDM-1, 基因敲除, 毒力, 耐药

Abstract:

Objective To compare the changes of virulence of Enterobacter cloacae before and after blaNDM-1 gene knockout, and to clarify the effect of blaNDM-1 gene on the virulence of Enterobacter cloacae. Methods The Enterobacter cloacae carrying blaNDM-1 gene were divided into Enterobacter cloacae T2 carrying drug resistant gene blaNDM-1 group(T2 group),Enterobacter cloacae T2 with blaNDM-1 gene-knockout group (ΔT2 group) and Enterobacter cloacae ATCC13047 control group (ST group). The stabilities of the plasmids in various groups were detected,and the colony movement diameters,biofilm absorbance (A)values, amounts of adhesion bacteria, adhesion rates and invasion adhesion ratios of the Enterobacter cloacae in various groups were detected. Results After 200 passages, the Enterobacter cloacae in T2 group still carried blaNDM-1 gene, while the Enterobacter cloacae in Δ T2 and ATCC13047 groups did not carry blaNDM-1 gene;the Enterobacter cloacae inT2 group only carried the carbapenem resistance gene blaNDM-1, while the other carbapenem resistance genes blaKPC-2, blaIMP-4, blaVIM-1 and blaOXA-48 were negative; five carbapenem resistance genes detected in Δ T2 and ST groups were negative;the Enterobacter cloacae in T2 and Δ T2 groups carried the same virulence genes clpB, icmf and acrA. The colony movement diameter of the bacteria in T2 group was smaller than those in Δ T2 and ST groups (P<0.05). Compared with T2 group, the biofilm A value in Δ T2 group was increased,but the difference was not significant(P>0.05). Compared with T2 group, the amount of adhesion bacteria in Δ T2 group was decreased,but the difference was not significant(P>0.05). After co-culture for 24 h, the adhesion rate and invasion adhesion ratio of the RAW264.7 cells in T2 group and Δ T2 group were lower than that in ST group (P<0.05). Conclusion BlaNDM-1 does not significantly increase the virulence of Enterobacter cloacae.

Key words: Enterobacter cloacae, BlaNDM-1, Gene knockout, Virulence, Drug-resistance

中图分类号: 

  • R378.2