Abstract
Due to increasing antimicrobial resistance, studies where new treatment options are investigated along with the synergistic effects of natural products with antibiotics have arisen. Pseudomonas aeruginosa (P. aeruginosa) is an opportunistic pathogen and infection with multi-drug resistant (MDR) P. aeruginosa poses a critical problem during treatment. Curcumin (CUR) is listed in the literature as one of the promising natural ingredients with its strong antimicrobial activity. In our study, our aim was to investigate the in vitro synergistic effect of CUR with imipenem (IMP) and Colistin (CST) in MDR P. aeruginosa isolates and in vivo activity on Galleria mellonella (G. mellonella) larvae. Three clinical isolates of MDR P. aeruginosa, which were determined to be phenotypically resistant to carbapenems, were used, and KPC and OXA48 resistance genes were determined by PCR method. The synergistic effect of CUR with antibiotics were investigated by the checkerboard method. Larval survival and bacterial load were compared with the in vivo study. In this study, IMP MIC values were significantly reduced (two to eight-fold decrease) in the presence of CUR, and partial synergy was observed. For CST, this value decreased two-fold. Bacterial load was evaluated to investigate the effect of antimicrobials during infection. While the CFUs increased over time in non-treated larvae as compared to the initial inoculum, bacterial load was significantly decreased for the groups treated with CUR, IMP and CST compared to the untreated group (p < 0.05). It was concluded CUR-antibiotic combinations can provide an alternative approach in the treatment of infections with MDR bacteria.




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Acknowledgements
I would like to thank Prof.Dr.Meryem Akpolat Ferah, who provided me with CUR in this study, and Biostatistics faculty member, Dr.Fürüzan Köktürk, who provided the control of statistics.
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Conceptualization, S.O. methodology, S.O. software, S.O.; validation S.O. formal analysis, S.O. statistical analysis,S.O.,F.K investigation, S.O., resources, S.O.; data curation, S.O.; writing—original draft preparation, writing—review and editing, S.O., B.K., visualization, S.O.,supervision, S.O., All authors have read and agreed to the published version of the manuscript.
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Communicated by Erko Stackebrandt.
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Ozturk, S. Demonstration of the efficacy of curcumin on carbapenem-resistant Pseudomonas aeruginosa with Galleria mellonella larvae model. Arch Microbiol 204, 524 (2022). https://doi.org/10.1007/s00203-022-03135-x
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DOI: https://doi.org/10.1007/s00203-022-03135-x


