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Chinese Journal of Antituberculosis ›› 2021, Vol. 43 ›› Issue (2): 153-158.doi: 10.3969/j.issn.1000-6621.2021.02.010

• Original Articles • Previous Articles     Next Articles

The study of in vitro synergistic activities of GSK656 with clarithromycin or azithromycin against Mycobacterium abscessus

GUO Hai-Ping, CHEN Lei, HUO Feng-min, PANG Yu, LI Shan-Shan()   

  1. *Department of Bacteriology and Immunology, Beijing Chest Hospital, Capital Medical University, Beijing 101149, China
  • Received:2020-09-14 Online:2021-02-10 Published:2021-02-03
  • Contact: GUO Hai-Ping,LI Shan-Shan E-mail:lss9011@126.com

Abstract:

Objective The purpose of this study was to assess in vitro drug susceptibility of M.abscessus against the combinations of the 3-aminomethyl 4-halogen benzoxaboroles compound GSK656 with macrolides, including clarithromycin (Clr) and azithromycin (Azm). Methods Eighty nontuberculous mycobacteria isolates were stored the biobank of Beijing Chest Hospital, Capital Medical University between 2016 and 2018, consisting of 30 isolates of M.abscessus, 7 isolates of Mycobacterium kansasii,37 isolates of Mycobacterium intracellulare, 5 isolates of Mycobacterium avium and 1 isolates of Mycobacterium fortuitum. The minimal inhibitory concentrations (MICs) were determined using Microporous Alamar-Blue Assay (MABA). Additionally, the checkerboard titration method was used to determine the synergistic effect between GSK656 and other antimicrobial agents. Results For Clr, the MIC values of M.abscessus isolates ranged from 0.031 mg/L to 16 mg/L. The proportion of Clr resistance was 10.0% (3/30) for M.abscessus. For Azm, the MIC values of M.abscessus isolates ranged from 0.125 to 64 mg/L. The Azm resistance was noted in 30.0% (9/30) of M.abscessus isolates. Additionally, GSK656 also exhibited the potent activity against M.abscessus isolates, the MIC50 and MIC90 of which were 0.25 and 2 mg/L, respectively. In the GSK656-Clr combination, 6 (20.0%,6/30) were synergistic, 23 (76.7%,23/30) were indifferent,1 (3.3%,1/30) was antagonistic. For the GSK656-Azm combination, 3 (10.0%,3/30) was synergistic, 18 (60.0%,18/30) were indifferent, and 9(30.0%,9/30)were antagonistic. Chi-square test results revealed that there was a statistically significant difference in synergistic distribution between GSK-Clr and GSK-Azm group (χ2=8.010,P=0.018). Conclusion Our data demonstrate that GSK656 has promising activity against M.abscessus in vitro. The synergistic distribution between GSK-Clr group and GSK-Azm group is statistically significant. The antagonistic effect is more frequent for GSK-Azm combination than GSK-Clr combination.

Key words: GSK656, Antimicrobial agent, Mycobacteria,atypical, Drug evaluation