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Chinese Journal of Antituberculosis ›› 2025, Vol. 47 ›› Issue (5): 597-604.doi: 10.19982/j.issn.1000-6621.20240518

• Original Articles • Previous Articles     Next Articles

High-throughput screening and identification of compounds with anti-Mycobacterium kansasii activity

Hu Qianfang1, Zhong Rujie2, Shang Yuanyuan2, Zhang Xuxia2,3, Li Shanshan2(), Wang Wei2,3()   

  1. 1Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing 300016, China
    2Bacterial Immunology Laboratory/Beijing Key Laboratory for Drug-Resistant Tuberculosis Research, Beijing Chest Hospital, Capital Medical University/Beijing Tuberculosis and Thoracic Tumor Research Institute, Beijing 101149, China
    3National Clinical Laboratory on Tuberculosis/Beijing Key Laboratory for Drug-Resistant Tuberculosis Research, Beijing Chest Hospital, Capital Medical University/Beijing Tuberculosis and Thoracic Tumor Research Institute, Beijing 101149, China
  • Received:2024-11-21 Online:2025-05-10 Published:2025-04-29
  • Contact: Li Shanshan, Email: lss9011@126.com; Wang Wei, Email: wangwei010@aliyun.com
  • Supported by:
    Beijing Science and Technology New Star Program(20230484295);National Key Research and Development Program of China(2024YFC2311200)

Abstract:

Objective: To establish a high-throughput screening (HTS) platform for compounds actively against Mycobacterium kansasii and identify novel candidates. Methods: A 96-well plate-based HTS system was developed to screen a G protein-coupled receptor (GPCR) compound library for candidates with anti-M.kansasii activity. Selected candidates were evaluated for antibacterial activity against clinical strains, time-kill kinetics, biofilm inhibition, and cytotoxicity. Data were statistically analyzed using t-tests and analysis of variance (ANOVA) at P<0.05. Results: Seventeen candidate compounds with anti-M.kansasii activity were identified. Promethazine hydrochloride and vorapaxar exhibited best performance against the M.kansasii standard strain (ATCC 12478), with minimum inhibitory concentrations (MIC) of 1.6 μg/ml and 1.23 μg/ml, respectively, and both of them showed a MIC of 2 μg/ml against rifampin-resistant clinical isolates. Time-kill curve experiments and Biofilm inhibition assays demonstrated their anti-ATCC 12478 activity and anti-biofilm effect were both concentration-dependent. Promethazine hydrochloride exhibited an inhibitory effect only at 8 μg/ml (A450=3.027 vs. 1.984, t=4.183, P=0.014), whereas vorapaxar showed significant inhibitory effects at both 4 μg/ml (A450=3.027 vs. 1.959, t=4.342, P=0.012) and 8 μg/ml (A450=3.027 vs. 2.024, t=4.493, P=0.019), with all differences being statistically significant. There was no statistically significant difference in cell viability compared to the control group after cell being cultured with Promethazine hydrochloride for 24 hours. Vorapaxar caused a slight reduction in cell viability only at a concentration of 20 μmol/L compared with control group (survival rate=84.97% vs. 99.97%, t=3.098, P=0.021). Conclusion: A high-throughput screening platform for compounds with anti-M.kansasii activity was successfully established, and both promethazine hydrochloride and vorapaxar exhibited significant anti-M.kansasii activity as well as concentration-dependent antibiofilm activity, providing potential candidate compounds for the development of new anti-M.kansasii drugs.

Key words: Mycobacterium kansasii, High-throughput screening, Promethazine, Vorapaxar, Biofilms

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