Resistance Response and Regulatory Mechanisms of Ciprofloxacin-Induced Resistant Salmonella Typhimurium Based on Comprehensive Transcriptomic and Metabolomic Analysis

作者：Xiaohan Yang, Jinhua Chu, Lulu Huang, Muhammad Haris Raza Farhan, Mengyao Feng, J.Z. Bai, Bangjuan Wang, Guyue Cheng · 发表于：Antibiotics · 年份：2025 · DOI：10.3390/antibiotics14080767 · 被引用次数：4 · 研究领域：Antibiotic Resistance in Bacteria、Salmonella and Campylobacter epidemiology、Bacterial Genetics and Biotechnology

BACKGROUND: to fluoroquinolones, the first-line drugs for clinical treatment. METHODS: Typhimurium CICC 10420 as the test strain, ciprofloxacin was used for in vitro induction to develop the drug-resistant strain H1. Changes in the minimum inhibitory concentrations (MICs) of various antimicrobial agents were determined using the broth microdilution method. Transcriptomic and metabolomic analyses were conducted to investigate alterations in gene and metabolite expression. A combined drug susceptibility test was performed to evaluate the potential of exogenous metabolites to restore antibiotic susceptibility. RESULTS: The MICs of strain H1 for ofloxacin and enrofloxacin increased by 128- and 256-fold, respectively, and the strain also exhibited resistance to ceftriaxone, ampicillin, and tetracycline. A single-point mutation of Glu469Asp in the GyrB was detected in strain H1. Integrated multi-omics analysis showed significant differences in gene and metabolite expression across multiple pathways, including two-component systems, ABC transporters, pentose phosphate pathway, purine metabolism, glyoxylate and dicarboxylate metabolism, amino sugar and nucleotide sugar metabolism, pantothenate and coenzyme A biosynthesis, pyrimidine metabolism, arginine and proline biosynthesis, and glutathione metabolism. Notably, the addition of exogenous glutamine, in combination with tetracycline, significantly reduced the resistance of strain H1 to tetracycline. CONCLUSION: resistance involves b...