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Modified tetra-oxygenated xanthones analogues as anti-MRSA and P. aeruginosa agent and their synergism with vancomycin. Bioorg Med Chem Lett 2020; 30:127494. [PMID: 32795625 DOI: 10.1016/j.bmcl.2020.127494] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/29/2020] [Accepted: 08/10/2020] [Indexed: 11/21/2022]
Abstract
Five isolated xanthones from the C. cochinchinense and G. mangostana were evaluated and tested for antibacterial activities. Isolated 4 and 5 exhibited potent anti-MRSA and P. aeruginosa activity, but showed poor pharmacokinetic properties via ADMET prediction. It led us to improve pharmacokinetic properties of 4 and 5 by partially modifying them in acidic condition yielding fourteen analogues. It was found that analogues 4b, 4d and 5b possessed proper pharmacokinetic properties, while only 4b exhibited the best anti-MRSA and P. aeruginosa activity. The SEM results indicated that 4b may interact with or damage the cell wall of MRSA and P. aeruginosa. Moreover, a combination of 4b and vancomycin exhibits synergistic effect against both MRSA and P. aeruginosa at MIC value of 4.98 (MIC = 18.75 μg/mL for 4b) and 9.52 μg/mL (MIC = 75 μg/mL for 4b), respectively.
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Mutations in Neisseria gonorrhoeae grown in sub-lethal concentrations of monocaprin do not confer resistance. PLoS One 2018; 13:e0195453. [PMID: 29621310 PMCID: PMC5886539 DOI: 10.1371/journal.pone.0195453] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 03/22/2018] [Indexed: 11/19/2022] Open
Abstract
Neisseria gonorrhoeae, due to its short lipooligosaccharide structure, is generally more sensitive to the antimicrobial effects of some fatty acids than most other Gram negative bacteria. This supports recent development of a fatty acid-based potential treatment for gonococcal infections, particularly ophthalmia neonatorum. The N. gonorrhoeae genome contains genes for fatty acid resistance. In this study, the potential for genomic mutations that could lead to resistance to this potential new treatment were investigated. N. gonorrhoeae strain NCCP11945 was repeatedly passaged on growth media containing a sub-lethal concentration of fatty acid myristic acid and monoglyceride monocaprin. Cultures were re-sequenced and assessed for changes in minimum inhibitory concentration. Of note, monocaprin grown cultures developed a mutation in transcription factor gene dksA, which suppresses molecular chaperone DnaK and may be involved in the stress response. The minimum inhibitory concentration after exposure to monocaprin showed a modest two-fold change. The results of this study suggest that N. gonorrhoeae cannot readily evolve resistance that will impact treatment of ophthalmia neonatorum with monocaprin.
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Buono SA, Watson TD, Borenstein LA, Klausner JD, Pandori MW, Godwin HA. Stemming the tide of drug-resistant Neisseria gonorrhoeae: the need for an individualized approach to treatment. J Antimicrob Chemother 2014; 70:374-81. [PMID: 25331059 DOI: 10.1093/jac/dku396] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Drug-resistant Neisseria gonorrhoeae poses a significant public health challenge. In recent years, gonococci resistant to first- and second-line antibiotics have spread worldwide and new strains have developed that are increasingly resistant to third-generation cephalosporins, which are currently our last line of available treatments. Given the timeline required to develop new drugs or an effective vaccine for N. gonorrhoeae, a top priority is to use the drugs that are available as effectively as possible. Currently, clinical management of gonorrhoea is based upon treatment guidelines informed by international gonococcal antimicrobial susceptibility surveillance programmes. This approach, although currently the most practical, is subject to a number of limitations since surveillance data inherently provide population-level information. As a result, basing treatment guidelines on these data can result in the prescription of more aggressive or broader treatment than is needed by individual patients and hence inadvertently contribute to the development and spread of resistance to important drugs. Clearly, methods are needed that provide patient-specific drug susceptibility information in a time frame that would allow clinicians to prescribe individualized treatment regimens for gonorrhoea. Fortunately, in recent years, there have been a number of advances in the development of rapid methods for characterizing both the genotype and the drug resistance phenotype of N. gonorrhoeae strains. Here, we review these advances and propose additional studies that would help facilitate a transition towards an individualized treatment approach for gonorrhoea.
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Affiliation(s)
- Sean A Buono
- Department of Environmental Health Sciences, Fielding School of Public Health, UCLA, 650 Charles E. Young Drive South, Los Angeles, CA 90095, USA UCLA Global Bio Lab, California Nanosystems Institute, UCLA, 570 Westwood Plaza Building 114, Los Angeles, CA 90095, USA
| | - Tyler D Watson
- Department of Environmental Health Sciences, Fielding School of Public Health, UCLA, 650 Charles E. Young Drive South, Los Angeles, CA 90095, USA
| | - Lee A Borenstein
- UCLA Global Bio Lab, California Nanosystems Institute, UCLA, 570 Westwood Plaza Building 114, Los Angeles, CA 90095, USA Los Angeles County Public Health Laboratory, 12750 Erickson Avenue, Downey, CA 90242, USA
| | - Jeffrey D Klausner
- David Geffen School of Medicine, UCLA, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
| | - Mark W Pandori
- San Francisco Public Health Laboratory, San Francisco Department of Public Health, 101 Grove Street, Suite 419, San Francisco, CA 94102, USA
| | - Hilary A Godwin
- Department of Environmental Health Sciences, Fielding School of Public Health, UCLA, 650 Charles E. Young Drive South, Los Angeles, CA 90095, USA UCLA Global Bio Lab, California Nanosystems Institute, UCLA, 570 Westwood Plaza Building 114, Los Angeles, CA 90095, USA Institute of the Environment and Sustainability, UCLA, La Kretz Hall, Suite 300, Box 951496, Los Angeles, CA 90095, USA
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Li SY. Global transmission of multiple-drug resistant Neisseria gonorrhoeae strains refractive to cephalosporin treatment. J Formos Med Assoc 2012; 111:463-4. [DOI: 10.1016/j.jfma.2012.03.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 03/01/2012] [Accepted: 03/06/2012] [Indexed: 10/28/2022] Open
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Stefanelli P. Emerging resistance in Neisseria meningitidis and Neisseria gonorrhoeae. Expert Rev Anti Infect Ther 2011; 9:237-44. [PMID: 21342071 DOI: 10.1586/eri.10.171] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The value of monitoring antimicrobial resistance is particularly significant for Neisseria meningitidis and Neisseria gonorrhoeae diseases, even if it is for different reasons. Although there is no global alert for the spread of resistant meningococcal strains, the emergence of resistance is correlated to the outcome of treatment and the successful prophylaxis of close contacts. Few cases of resistance among meningococci have been recorded worldwide; it remains unclear what intriguing mechanism is responsible for maintaining resistance in these cases in the absence of significant antibiotic selective pressure, as in the case of penicillin; on the contrary, although rifampicin is the antibiotic of choice in the prophylaxis of close contacts, there is a very low rate of resistance. The emergence of multidrug-resistant N. gonorrhoeae is a great challenge in controlling gonorrhea as one of the main sexually transmitted bacterial diseases. International surveillance programs permit the monitoring of the susceptibility of the pathogen and allow the revision of the standardized treatment regimen when the situation changes.
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Affiliation(s)
- Paola Stefanelli
- Department of Infectious, Parasitic and Immune-mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
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Huang CT, Niu J, Liao MH, Li SY. A duplex PCR method to identify mosaic penA gene and predict reduced susceptibility to oral cephalosporins in Neisseria gonorrhoeae. J Microbiol Methods 2010; 83:257-9. [PMID: 20801168 DOI: 10.1016/j.mimet.2010.08.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2010] [Accepted: 08/12/2010] [Indexed: 11/27/2022]
Abstract
Neisseria gonorrhoeae with mosaic penicillin-binding protein 2 (PBP2) is associated with reduced susceptibility to third-generation oral cephalosporins. A simple and rapid PCR method using three primers was designed to identify mosaic PBP2, which could help predict reduced susceptibility to expanded-spectrum cephalosporins in N. gonorrhoeae.
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Affiliation(s)
- Chung-Ter Huang
- Research and Diagnostic Center, Centers for Disease Control, Taipei, Taiwan
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