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Effect of Carbonyl Cyanide Chlorophenylhydrazone on Intrabacterial Concentration and Antimicrobial Activity of Amphenicols against Swine Resistant Actinobacillus pleuropneumoniae and Pasteurella multocida

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Abstract

Effects and mechanism of carbonyl cyanide chlorophenylhydrazone (CCCP) on antimicrobial activity of florfenicol (FF) and thiamphenicol (TAP) were investigated against amphenicol-resistant Actinobacillus pleuropneumoniae and Pasteurella multocida isolated from diseased swine. Broth microdilution and time-kill assays indicated that CCCP dose-dependently and substantially (4-32 fold MIC reduction) improved amphenicol antimicrobial activity. When combined with CCCP at the lowest literature reported dose (2-5 μg/mL), 85% FF resistant A. pleuropneumoniae and 92% resistant P. multocida showed significantly reduced FF MICs (≥ 4-fold). In contrast, none or few of the susceptible A. pleuropneumoniae and P. multocida had FF MICs reduction ≥ 4-fold. 90% FF resistant A. pleuropneumoniae and 96% resistant P. multocida carried the floR gene, indicating strong association with the FloR efflux pump. With CCCP, the intracellular FF concentration increased by 71% in floR+ resistant A. pleuropneumoniae and 156% in floR+ resistant P. multocida strains but not the susceptible strains. The degree of reduction in TAP MICs was found consistently in parallel to FF for both bacteria. Taken together, partially attributed to blockage of drug-efflux, the combination of FF or TAP with CCCP at sub-cytotoxic concentrations was demonstrated and showed feasibility to combat amphenicol-resistant A. pleuropneumoniae and P. multocida isolated from diseased swine.

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The datasets generated from this study are available upon request to the corresponding author.

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Acknowledgments

The authors thank Dr. Wu Ying-Chen for his support in molecular biology facility.

Funding

This research was funded by Ministry of Science and Technology, Taiwan, grant number 106-2622-B-005 -006-CC2.

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CCC conceptualization, writing-review and editing, supervision and funding acquisition. PR conducting the experiments, data analysis and original draft preparation. HCK provided the bacterial isolates and identified their species and serovars. SKC methodology and validation. LAT critical reviewing and editing. WYS data curation and analysis. All authors contributed to the article and approved the submitted version.

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Correspondence to Chi-Chung Chou.

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All authors contributed to the study conception and design. All authors read and approved the final manuscript.

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Rattanapanadda, P., Kuo, HC., Chang, SK. et al. Effect of Carbonyl Cyanide Chlorophenylhydrazone on Intrabacterial Concentration and Antimicrobial Activity of Amphenicols against Swine Resistant Actinobacillus pleuropneumoniae and Pasteurella multocida. Vet Res Commun 46, 903–916 (2022). https://doi.org/10.1007/s11259-022-09917-4

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  • DOI: https://doi.org/10.1007/s11259-022-09917-4

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