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Zhang J, Tan YM, Li SR, Battini N, Zhang SL, Lin JM, Zhou CH. Discovery of benzopyridone cyanoacetates as new type of potential broad-spectrum antibacterial candidates. Eur J Med Chem 2024; 265:116107. [PMID: 38171147 DOI: 10.1016/j.ejmech.2023.116107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 12/23/2023] [Accepted: 12/26/2023] [Indexed: 01/05/2024]
Abstract
Unique benzopyridone cyanoacetates (BCs) as new type of promising broad-spectrum antibacterial candidates were discovered with large potential to combat the lethal multidrug-resistant bacterial infections. Many prepared BCs showed broad antibacterial spectrum with low MIC values against the tested strains. Some highly active BCs exhibited rapid sterilization capacity, low resistant trend and good predictive pharmacokinetic properties. Furthermore, the highly active sodium BCs (NaBCs) displayed low hemolysis and cytotoxicity, and especially octyl NaBC 5g also showed in vivo potent anti-infective potential and appreciable pharmacokinetic profiles. A series of preliminary mechanistic explorations indicated that these active BCs could effectively eliminate bacterial biofilm and destroy membrane integrity, thus resulting in the leakage of bacterial cytoplasm. Moreover, their unique structures might further bind to intracellular DNA, DNA gyrase and topoisomerase IV through various direct noncovalent interactions to hinder bacterial reproduction. Meanwhile, the active BCs also induced bacterial oxidative stress and metabolic disturbance, thereby accelerating bacterial apoptosis. These results provided a bright hope for benzopyridone cyanoacetates as potential novel multitargeting broad-spectrum antibacterial candidates to conquer drug resistance.
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Affiliation(s)
- Jing Zhang
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Yi-Min Tan
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Shu-Rui Li
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Narsaiah Battini
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Shao-Lin Zhang
- School of Pharmaceutical Sciences, Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chongqing University, Chongqing, 401331, China.
| | - Jian-Mei Lin
- Department of Infections, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, China.
| | - Cheng-He Zhou
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
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2
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Gao J, Wang F, Zhu B, Li P, Wang Z, Wang J. Universal response method for accurate quantitative analysis of the impurities in quinolone antibiotics using liquid chromatography coupled with diode array detector and charged aerosol detector. J Chromatogr A 2023; 1710:464412. [PMID: 37757529 DOI: 10.1016/j.chroma.2023.464412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 09/03/2023] [Accepted: 09/22/2023] [Indexed: 09/29/2023]
Abstract
HPLC method is the standard method for the separation and quantification of impurities from quinolone antibiotics. However, due to the large differences in the UV absorption of the impurities in quinolone antibiotics, quantitative analysis without the availability of corresponding reference substances currently poses a challenge. A sensitive and direct method using high performance liquid chromatography coupled with diode array detector and charged aerosol detector (HPLC-DAD-CAD) was developed for the analysis of impurities in quinolone antibiotics. The chromatographic conditions were optimized for good separation and output signal of CAD detector by response surface method (RSM). The systematic variation of CAD parameter settings, such as nebulization temperature, filter constant and power function value (PFV), were used to study the effect of on the detector response of signal-to-noise ratios (S/N) and linearity for ofloxacin, ciprofloxacin and their impurities. In the method validation, good linearity of each component was obtained with coefficient of determination (r) greater than 0.999 in the range of 0.5-300 μg mL-1. The average recoveries of each component were 99.02-102.39 % by DAD, were 98.22-101.91 % by CAD, RSDs were less than 2.5 % for intra-day and inter-day precision by DAD-CAD, with good precision and accuracy. The correction factor experimental results showed that the developed method provided a uniform response to the impurities with differences chromophores and could unbiasedly and directly detect the impurities in quinolone antibiotics. The method is first reported application of HPLC-DAD-CAD method for the analysis of impurities in quinolone antibiotics and it can be used for quality control of quinolone antibiotics.
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Affiliation(s)
- Jiarui Gao
- Zhejiang University of Technology, Hangzhou 310014, China
| | - Fan Wang
- Zhejiang Institute for Food and Drug Control, Key Laboratory for Core Technology of Generic Drug Evaluation National Medical Product Administration & Key Laboratory of Drug Contacting Materials Quality Control of Zhejiang Province, Hangzhou 310052, China
| | - Bingqi Zhu
- Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Ping Li
- Zhejiang University of Technology, Hangzhou 310014, China
| | - Zhijian Wang
- Zhejiang Institute for Food and Drug Control, Key Laboratory for Core Technology of Generic Drug Evaluation National Medical Product Administration & Key Laboratory of Drug Contacting Materials Quality Control of Zhejiang Province, Hangzhou 310052, China
| | - Jian Wang
- Zhejiang University of Technology, Hangzhou 310014, China; Zhejiang Institute for Food and Drug Control, Key Laboratory for Core Technology of Generic Drug Evaluation National Medical Product Administration & Key Laboratory of Drug Contacting Materials Quality Control of Zhejiang Province, Hangzhou 310052, China.
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3
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da Silva LYS, Paulo CLR, Moura TF, Alves DS, Pessoa RT, Araújo IM, de Morais Oliveira-Tintino CD, Tintino SR, Nonato CDFA, da Costa JGM, Ribeiro-Filho J, Coutinho HDM, Kowalska G, Mitura P, Bar M, Kowalski R, Menezes IRAD. Antibacterial Activity of the Essential Oil of Piper tuberculatum Jacq. Fruits against Multidrug-Resistant Strains: Inhibition of Efflux Pumps and β-Lactamase. PLANTS (BASEL, SWITZERLAND) 2023; 12:2377. [PMID: 37376002 DOI: 10.3390/plants12122377] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 06/10/2023] [Accepted: 06/14/2023] [Indexed: 06/29/2023]
Abstract
Antimicrobial resistance has become a growing public health concern in recent decades, demanding a search for new effective treatments. Therefore, this study aimed to elucidate the phytochemical composition and evaluate the antibacterial activity of the essential oil obtained from the fruits of Piper tuberculatum Jacq. (EOPT) against strains carrying different mechanisms of antibiotic resistance. Phytochemical analysis was performed using gas chromatography-mass spectrometry (GC/MS). The antibacterial activity of EOPT and its ability to inhibit antibiotic resistance was evaluated through the broth microdilution method. The GC-MS analysis identified 99.59% of the constituents, with β-pinene (31.51%), α-pinene (28.38%), and β-cis-ocimene (20.22%) being identified as major constituents. The minimum inhibitory concentration (MIC) of EOPT was determined to assess its antibacterial activity against multidrug-resistant strains of Staphylococcus aureus (IS-58, 1199B, K2068, and K4100). The compound showed a MIC of ≥ 1024 μg/mL, suggesting a lack of intrinsic antibacterial activity. However, when the EOPT was associated with antibiotics and EtBr, a significant decrease in antibiotic resistance was observed, indicating the modulation of efflux pump activity. This evidence was corroborated with the observation of increased fluorescent light emission by the bacterial strains, indicating the involvement of the NorA and MepA efflux pumps. Additionally, the significant potentiation of ampicillin activity against the S. aureus strain K4414 suggests the β-lactamase inhibitory activity of EOPT. These results suggest that the essential oil from P. tuberculatum fruits has antibiotic-enhancing properties, with a mechanism involving the inhibition of efflux pumps and β-lactamase in MDR S. aureus strains. These findings provide new perspectives on the potential use of EOPT against antibiotic resistance and highlight the importance of Piper species as sources of bioactive compounds with promising therapeutic activities against MDR bacteria. Nevertheless, further preclinical (in vivo) studies remain necessary to confirm these in vitro-observed results.
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Affiliation(s)
- Lucas Yure Santos da Silva
- Laboratory of Pharmacology and Molecular Chemistry, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | - Cicera Laura Roque Paulo
- Laboratory of Microbiology and Molecular Biology, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | - Talysson Felismino Moura
- Laboratory of Microbiology and Molecular Biology, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | - Daniel Sampaio Alves
- Laboratory of Microbiology and Molecular Biology, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | - Renata Torres Pessoa
- Laboratory of Pharmacology and Molecular Chemistry, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | - Isaac Moura Araújo
- Laboratory of Microbiology and Molecular Biology, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | | | - Saulo Relison Tintino
- Laboratory of Microbiology and Molecular Biology, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | - Carla de Fatima Alves Nonato
- Laboratory Natural Products Research, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | - José Galberto Martins da Costa
- Laboratory Natural Products Research, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | - Jaime Ribeiro-Filho
- Oswaldo Cruz Foundation (FIOCRUZ), Fiocruz Ceará, R. São José, S/N-Precabura, Eusébio 21040-900, CE, Brazil
| | - Henrique Douglas Melo Coutinho
- Laboratory of Microbiology and Molecular Biology, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
| | - Grażyna Kowalska
- Department of Tourism and Recreation, University of Life Sciences in Lublin, 15 Akademicka Str., 20-950 Lublin, Poland
| | - Przemysław Mitura
- Department of Urology and Oncological Urology, Medical University of Lublin, 8 Jaczewskiego Str., 20-954 Lublin, Poland
| | - Marek Bar
- Department of Urology and Oncological Urology, Medical University of Lublin, 8 Jaczewskiego Str., 20-954 Lublin, Poland
| | - Radosław Kowalski
- Department of Analysis and Food Quality Assessment, University of Life Sciences in Lublin, 8 Skromna Str., 20-704 Lublin, Poland
| | - Irwin Rose Alencar de Menezes
- Laboratory of Pharmacology and Molecular Chemistry, Department of Biological Chemistry, Regional University of Cariri-URCA, Crato 63105-000, CE, Brazil
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Rissardo JP, Caprara ALF. Fluoroquinolone-Associated Movement Disorder: A Literature Review. MEDICINES (BASEL, SWITZERLAND) 2023; 10:33. [PMID: 37367728 DOI: 10.3390/medicines10060033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 05/04/2023] [Accepted: 05/23/2023] [Indexed: 06/28/2023]
Abstract
BACKGROUND Fluoroquinolones (FQNs) are related to several central nervous system side effects. This review aims to evaluate the clinical-epidemiological profile, pathophysiological mechanisms, and management of FQNs-associated movement disorders (MDs). METHODS Two reviewers identified and assessed relevant reports in six databases without language restriction between 1988 and 2022. RESULTS A total of 45 reports containing 51 cases who developed MDs secondary to FQNs were reported. The MDs included 25 myoclonus, 13 dyskinesias, 7 dystonias, 2 cerebellar syndromes, 1 ataxia, 1 tic, and 2 undefined cases. The FQNs reported were ciprofloxacin, ofloxacin, gatifloxacin, moxifloxacin, levofloxacin, gemifloxacin, and pefloxacin. The mean and median age were 64.54 (SD: 15.45) and 67 years (range: 25-87 years). The predominant sex was male (54.16%). The mean and median time of MD onset were 6.02 (SD: 10.87) and 3 days (range: 1-68 days). The mean and median recovery time after MD treatment was 5.71 (SD: 9.01) and 3 days (range: 1-56 days). A complete recovery was achieved within one week of drug withdrawal in 80.95% of the patients. Overall, 95.83% of the individuals fully recovered after management. CONCLUSIONS Future cases need to describe the long-term follow-up of the individuals. Additionally, FQN-induced myoclonus should include electrodiagnostic studies.
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Affiliation(s)
- Jamir Pitton Rissardo
- Medicine Department, Federal University of Santa Maria, Santa Maria 97105-900, Brazil
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Zhang J, Battini N, Ou JM, Zhang SL, Zhang L, Zhou CH. New Efforts toward Aminothiazolylquinolones with Multitargeting Antibacterial Potential. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:2322-2332. [PMID: 36700862 DOI: 10.1021/acs.jafc.2c08293] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
New antibacterial 3-(aminothiazolyl)quinolones (ATQs) were designed and efficiently synthesized to counteract the growing multidrug resistance in animal husbandry. Bioactive assays manifested that N,N-dicyclohexylaminocarbonyl ATQ 10e and methyl ATQ 17a, respectively, showed better antibacterial behavior against Staphylococcus aureus ATCC 29213 and Pseudomonas aeruginosa than reference drug norfloxacin. Notably, highly active ATQ 17a with low hemolysis, negligible mammalian cytotoxicity, and good pharmacokinetic properties displayed low trends to induce resistance and synergistic combinations with norfloxacin. Preliminary mechanism exploration implied that representative ATQ 17a could inhibit the formation of biofilms and destroy bacterial membrane integrity, further binding to intracellular DNA and DNA gyrase to hinder bacterial DNA replication. ATQ 17a could also induce the production of excess reactive oxygen species and reduce bacterial metabolism to accelerate bacterial death. These results provided a promise for 3-(aminothiazolyl)quinolones as new potential multitargeting antibacterial agents to treat bacterial infection of animals.
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Affiliation(s)
- Jing Zhang
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Narsaiah Battini
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Jia-Ming Ou
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Shao-Lin Zhang
- School of Pharmaceutical Sciences, Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chongqing University, Chongqing 401331, P. R. China
| | - Ling Zhang
- School of Chemical Technology, Shijiazhuang University, Shijiazhuang 050035, P. R. China
| | - Cheng-He Zhou
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
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6
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New potent ciprofloxacin-uracil conjugates as DNA gyrase and topoisomerase IV inhibitors against methicillin-resistant Staphylococcus aureus. Bioorg Med Chem 2022; 73:117004. [PMID: 36148773 DOI: 10.1016/j.bmc.2022.117004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 09/07/2022] [Accepted: 09/08/2022] [Indexed: 11/20/2022]
Abstract
A series of ciprofloxacin-uracil conjugates 5a-t were synthesized and identified by 1H NMR, 13C NMR, mass spectroscopy and elemental analyses. The antibacterial results revealed that the new derivatives exhibited better activity against Gram-positive than the Gram-negative strains; most of the target compounds exhibited good activities against S. aureus ATCC 6538. Compounds 5b and 5g possess the highest activities with MICs of 1.25 and 2.37 µM, respectively, which are more potent than the parent drug ciprofloxacin, MIC, 7.58 µM. In addition, they also exhibited potent activities against MRSA AUMC 261 with MICs, 0.031 and 0.046 µM respectively, higher than ciprofloxacin with MIC, 0.57 µM. Moreover, compounds 5b and 5g showed potent inhibitory activities against DNA gyrase (IC50 = 1.72 and 5.72 µM) and topoisomerase IV (4.36 and 7.77 µM) compared to ciprofloxacin with IC50 values 0.66 and 8.16 µM, respectively. The molecular docking study revealed that compounds 5b and 5g may formed stable interaction with the active sites of DNA gyrase and topoisomerase IV similar to ciprofloxacin. Hence, 5b and 5g are considered promising antibacterial candidated against MRSA AUMC 261 strains that requires further optimization.
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Jaramillo‐Riveri S, Broughton J, McVey A, Pilizota T, Scott M, El Karoui M. Growth-dependent heterogeneity in the DNA damage response in Escherichia coli. Mol Syst Biol 2022; 18:e10441. [PMID: 35620827 PMCID: PMC9136515 DOI: 10.15252/msb.202110441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 04/13/2022] [Accepted: 04/27/2022] [Indexed: 11/16/2022] Open
Abstract
In natural environments, bacteria are frequently exposed to sub-lethal levels of DNA damage, which leads to the induction of a stress response (the SOS response in Escherichia coli). Natural environments also vary in nutrient availability, resulting in distinct physiological changes in bacteria, which may have direct implications on their capacity to repair their chromosomes. Here, we evaluated the impact of varying the nutrient availability on the expression of the SOS response induced by chronic sub-lethal DNA damage in E. coli. We found heterogeneous expression of the SOS regulon at the single-cell level in all growth conditions. Surprisingly, we observed a larger fraction of high SOS-induced cells in slow growth as compared with fast growth, despite a higher rate of SOS induction in fast growth. The result can be explained by the dynamic balance between the rate of SOS induction and the division rates of cells exposed to DNA damage. Taken together, our data illustrate how cell division and physiology come together to produce growth-dependent heterogeneity in the DNA damage response.
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Affiliation(s)
| | - James Broughton
- Institute of Cell Biology and SynthSysUniversity of EdinburghEdinburghUK
| | - Alexander McVey
- Institute of Cell Biology and SynthSysUniversity of EdinburghEdinburghUK
- Present address:
OGI Bio LtdEdinburghUK
| | - Teuta Pilizota
- Institute of Cell Biology and SynthSysUniversity of EdinburghEdinburghUK
| | - Matthew Scott
- Department of Applied MathematicsUniversity of WaterlooWaterlooONCanada
| | - Meriem El Karoui
- Institute of Cell Biology and SynthSysUniversity of EdinburghEdinburghUK
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Bush NG, Diez-Santos I, Abbott LR, Maxwell A. Quinolones: Mechanism, Lethality and Their Contributions to Antibiotic Resistance. Molecules 2020; 25:E5662. [PMID: 33271787 PMCID: PMC7730664 DOI: 10.3390/molecules25235662] [Citation(s) in RCA: 125] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/27/2020] [Accepted: 11/28/2020] [Indexed: 12/05/2022] Open
Abstract
Fluoroquinolones (FQs) are arguably among the most successful antibiotics of recent times. They have enjoyed over 30 years of clinical usage and become essential tools in the armoury of clinical treatments. FQs target the bacterial enzymes DNA gyrase and DNA topoisomerase IV, where they stabilise a covalent enzyme-DNA complex in which the DNA is cleaved in both strands. This leads to cell death and turns out to be a very effective way of killing bacteria. However, resistance to FQs is increasingly problematic, and alternative compounds are urgently needed. Here, we review the mechanisms of action of FQs and discuss the potential pathways leading to cell death. We also discuss quinolone resistance and how quinolone treatment can lead to resistance to non-quinolone antibiotics.
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Affiliation(s)
| | | | | | - Anthony Maxwell
- Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK; (N.G.B.); (I.D.-S.); (L.R.A.)
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Wang P, Hu L, Hao Z. Palmatine Is a Plasmid-Mediated Quinolone Resistance (PMQR) Inhibitor That Restores the Activity of Ciprofloxacin Against QnrS and AAC(6')-Ib-cr-Producing Escherichia coli. Infect Drug Resist 2020; 13:749-759. [PMID: 32210589 PMCID: PMC7069587 DOI: 10.2147/idr.s242304] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 02/13/2020] [Indexed: 12/12/2022] Open
Abstract
Purpose The emergence of plasmid-mediated quinolone resistance (PMQR) is a global challenge in the treatment of clinical disease in both humans and animals and is exacerbated by the presence of different PMQR genes existing in the same bacterial strain. Here, we discovered that a natural isoquinoline alkaloid palmatine extracted from traditional Chinese medicinal plants effectively inhibited the activity of PMQR proteins QnrS and AAC(6′)-Ib-cr. Methods In total 120 clinical ciprofloxacin-resistant Escherichia coli (E. coli) were screened for the presence of qnrS and aac(6ʹ)-Ib-cr by PCR. Recombinant E. coli that produced QnrS or AAC(6ʹ)-Ib-cr proteins were constructed and the correct expression was confirmed by MALDI/TOF MS analysis and SDS-PAGE. A minimal inhibitory concentration (MICs) assay, growth curve assay and time-kill assay were conducted to evaluate the in vitro antibacterial activity of palmatine and the combination of palmatine and ciprofloxacin. Cytotoxicity assays and mouse thigh infection model were used to evaluate the in vivo synergies. Molecular docking, gyrase supercoiling assay and acetylation assay were used to clarify the mechanism of action. Results Palmatine effectively restored the activity of ciprofloxacin against qnrS and aac(6ʹ)-Ib-cr-positive E. coli strains in a synergistic manner in vitro. In addition, the combined therapy significantly reduced the bacterial burden in a mouse thigh infection model. Molecular docking revealed that palmatine bound at the functional large loop B of QnrS and Trp102Arg and Asp179Tyr in the binding pocket of AAC(6′)-Ib-cr. Furthermore, interaction analysis confirmed that palmatine reduced the gyrase protective effect of QnrS and the acetylation effect of AAC(6′)-Ib-cr. Conclusion Our findings suggest that palmatine is a potential efficacious compound to restore PMQR-mediated ciprofloxacin resistance and warrants further preclinical evaluations.
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Affiliation(s)
- Peng Wang
- Agricultural Bio-Pharmaceutical Laboratory, Qingdao Agricultural University, Qingdao 266109, People's Republic of China
| | - Longfei Hu
- Agricultural Bio-Pharmaceutical Laboratory, Qingdao Agricultural University, Qingdao 266109, People's Republic of China
| | - Zhihui Hao
- National Centre for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, China Agricultural University, Beijing 100089, People's Republic of China
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Lack of the Major Multifunctional Catalase KatA in Pseudomonas aeruginosa Accelerates Evolution of Antibiotic Resistance in Ciprofloxacin-Treated Biofilms. Antimicrob Agents Chemother 2019; 63:AAC.00766-19. [PMID: 31307984 DOI: 10.1128/aac.00766-19] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 06/30/2019] [Indexed: 01/20/2023] Open
Abstract
During chronic biofilm infections, Pseudomonas aeruginosa bacteria are exposed to increased oxidative stress as a result of the inflammatory response. As reactive oxygen species (ROS) are mutagenic, the evolution of resistance to ciprofloxacin (CIP) in biofilms under oxidative stress conditions was investigated. We experimentally evolved six replicate populations of P. aeruginosa lacking the major catalase KatA in colony biofilms and stationary-phase cultures for seven passages in the presence of subinhibitory levels (0.1 mg/liter) of CIP or without CIP (eight replicate lineages for controls) under aerobic conditions. In CIP-evolved biofilms, a larger CIP-resistant subpopulation was isolated in the ΔkatA strain than in the wild-type (WT) PAO1 population, suggesting oxidative stress as a promoter of the development of antibiotic resistance. A higher number of mutations identified by population sequencing were observed in evolved ΔkatA biofilm populations (CIP and control) than in WT PAO1 populations evolved under the same conditions. Genes involved in iron assimilation were found to be exclusively mutated in CIP-evolved ΔkatA biofilm populations, probably as a defense mechanism against ROS formation resulting from Fenton reactions. Furthermore, a hypermutable lineage due to mutL inactivation developed in one CIP-evolved ΔkatA biofilm lineage. In CIP-evolved biofilms of both the ΔkatA strain and WT PAO1, mutations in nfxB, the negative regulator of the MexCD-OprJ efflux pump, were observed while in CIP-evolved planktonic cultures of both the ΔkatA strain and WT PAO1, mutations in mexR and nalD, regulators of the MexAB-OprM efflux pump, were repeatedly found. In conclusion, these results emphasize the role of oxidative stress as an environmental factor that might increase the development of antibiotic resistance in in vivo biofilms.
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Stokes JM, Lopatkin AJ, Lobritz MA, Collins JJ. Bacterial Metabolism and Antibiotic Efficacy. Cell Metab 2019; 30:251-259. [PMID: 31279676 PMCID: PMC6990394 DOI: 10.1016/j.cmet.2019.06.009] [Citation(s) in RCA: 273] [Impact Index Per Article: 54.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/06/2019] [Accepted: 06/10/2019] [Indexed: 02/07/2023]
Abstract
Antibiotics target energy-consuming processes. As such, perturbations to bacterial metabolic homeostasis are significant consequences of treatment. Here, we describe three postulates that collectively define antibiotic efficacy in the context of bacterial metabolism: (1) antibiotics alter the metabolic state of bacteria, which contributes to the resulting death or stasis; (2) the metabolic state of bacteria influences their susceptibility to antibiotics; and (3) antibiotic efficacy can be enhanced by altering the metabolic state of bacteria. Altogether, we aim to emphasize the close relationship between bacterial metabolism and antibiotic efficacy as well as propose areas of exploration to develop novel antibiotics that optimally exploit bacterial metabolic networks.
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Affiliation(s)
- Jonathan M Stokes
- Institute for Medical Engineering & Science, Department of Biological Engineering, and Synthetic Biology Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Infectious Disease & Microbiome Program, Broad Institute of MIT & Harvard, Cambridge, MA 02142, USA; Machine Learning for Pharmaceutical Discovery and Synthesis Consortium, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Allison J Lopatkin
- Institute for Medical Engineering & Science, Department of Biological Engineering, and Synthetic Biology Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Infectious Disease & Microbiome Program, Broad Institute of MIT & Harvard, Cambridge, MA 02142, USA; Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Michael A Lobritz
- Roche Pharma Research and Early Development, Roche Innovation Center Basel, 4070 Basel, Switzerland
| | - James J Collins
- Institute for Medical Engineering & Science, Department of Biological Engineering, and Synthetic Biology Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Infectious Disease & Microbiome Program, Broad Institute of MIT & Harvard, Cambridge, MA 02142, USA; Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA; Harvard-MIT Program in Health Sciences and Technology, Cambridge, MA 02139, USA.
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12
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Stokes JM, Gutierrez A, Lopatkin AJ, Andrews IW, French S, Matic I, Brown ED, Collins JJ. A multiplexable assay for screening antibiotic lethality against drug-tolerant bacteria. Nat Methods 2019; 16:303-306. [DOI: 10.1038/s41592-019-0333-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 01/29/2019] [Indexed: 02/06/2023]
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Ezelarab HAA, Abbas SH, Hassan HA, Abuo-Rahma GEDA. Recent updates of fluoroquinolones as antibacterial agents. Arch Pharm (Weinheim) 2018; 351:e1800141. [DOI: 10.1002/ardp.201800141] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 06/28/2018] [Accepted: 06/29/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Hend A. A. Ezelarab
- Faculty of Pharmacy, Department of Medicinal Chemistry; Minia University; Minia Egypt
| | - Samar H. Abbas
- Faculty of Pharmacy, Department of Medicinal Chemistry; Minia University; Minia Egypt
| | - Heba A. Hassan
- Faculty of Pharmacy, Department of Medicinal Chemistry; Minia University; Minia Egypt
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