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Ahmed S, Ahmed MZ, Rafique S, Almasoudi SE, Shah M, Jalil NAC, Ojha SC. Recent Approaches for Downplaying Antibiotic Resistance: Molecular Mechanisms. Biomed Res Int 2023; 2023:5250040. [PMID: 36726844 DOI: 10.1155/2023/5250040] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 10/06/2022] [Accepted: 10/12/2022] [Indexed: 01/25/2023]
Abstract
Antimicrobial resistance (AMR) is a ubiquitous public health menace. AMR emergence causes complications in treating infections contributing to an upsurge in the mortality rate. The epidemic of AMR in sync with a high utilization rate of antimicrobial drugs signifies an alarming situation for the fleet recovery of both animals and humans. The emergence of resistant species calls for new treatments and therapeutics. Current records propose that health drug dependency, veterinary medicine, agricultural application, and vaccination reluctance are the primary etymology of AMR gene emergence and spread. Recently, several encouraging avenues have been presented to contest resistance, such as antivirulent therapy, passive immunization, antimicrobial peptides, vaccines, phage therapy, and botanical and liposomal nanoparticles. Most of these therapies are used as cutting-edge methodologies to downplay antibacterial drugs to subdue the resistance pressure, which is a featured motive of discussion in this review article. AMR can fade away through the potential use of current cutting-edge therapeutics, advancement in antimicrobial susceptibility testing, new diagnostic testing, prompt clinical response, and probing of new pharmacodynamic properties of antimicrobials. It also needs to promote future research on contemporary methods to maintain host homeostasis after infections caused by AMR. Referable to the microbial ability to break resistance, there is a great ultimatum for using not only appropriate and advanced antimicrobial drugs but also other neoteric diverse cutting-edge therapeutics.
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Németh LJ, Martinek TA, Jójárt B. Tilted State Population of Antimicrobial Peptide PGLa Is Coupled to the Transmembrane Potential. J Chem Inf Model 2022; 62:4963-4969. [PMID: 36190907 DOI: 10.1021/acs.jcim.2c00667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cationic antimicrobial peptide PGLa gets into close contact with the anionic bacterial cell membrane, facilitating cross-membrane transport phenomena and membrane disruption depending on the concentration. The mechanisms of action are closely associated with the tilted insertion geometry of PGLa. Therefore, we aimed to understand the interaction between the transmembrane potential (TMP) and the orientation of the membrane-bound PGLa helix. Molecular dynamics simulations were performed with TMP, and we found that the PGLa tilt angle relative to the membrane is coupled with the TMP. Elevated TMP increases the population of the tilted state. We observed positive feedback between the tilt angle and the TMP, which occurs due to the electrostatic interaction between the peptidic helix and the Na+ cations at the membrane-water interface. These TMP coupled phenomena can contribute to understanding the direct antimicrobial and adjuvant effects of PGLa in combination with regular antibiotics.
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Affiliation(s)
- Lukács J Németh
- Institute of Food Engineering, University of Szeged, Mars tér 7, Szeged HU-6724, Hungary
| | - Tamás A Martinek
- Department of Medical Chemistry, University of Szeged, Dóm tér 8, Szeged HU-6720, Hungary.,ELKH-SZTE Biomimetic Systems Research Group, Eötvös Loránd Research Network, Szeged H6720, Hungary
| | - Balázs Jójárt
- Institute of Food Engineering, University of Szeged, Mars tér 7, Szeged HU-6724, Hungary
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Cao Z, Chen X, Chen J, Xia A, Bacacao B, Tran J, Sharma D, Bekale LA, Santa Maria PL. Gold nanocluster adjuvant enables the eradication of persister cells by antibiotics and abolishes the emergence of resistance. Nanoscale 2022; 14:10016-10032. [PMID: 35796201 PMCID: PMC9578678 DOI: 10.1039/d2nr01003h] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Persister cells are responsible for relapses of infections common in cystic fibrosis and chronic suppurative otitis media (CSOM). Yet, there are no Food and Drug Administration (FDA) approved antibiotics to eradicate persister cells. Frustratingly, the global preclinical bacterial pipeline does not contain antibacterial agents targeting persister cells. Therefore, we report a nontraditional antimicrobial chemotherapy strategy based on gold nanoclusters adjuvant to eradicate persister cells by existing antibiotics belonging to that different class. Compared to killing with antibiotics alone, combining antibiotics and AuNC@CPP sterilizes persister cells and biofilms. Enhanced killing of up to 4 orders of magnitude in a validated mouse model of CSOM with Pseudomonas aeruginosa infection was observed when combining antibiotics and AuNC@CPP, informing a potential approach to improve the treatment of CSOM. We established that the mechanism of action of AuNC@CPP is due to disruption of the proton gradient and membrane hyperpolarization. The method presented here could compensate for the lack of new antibiotics to combat persister cells. This method could also benefit the current effort to slow resistance development because AuNC@CPP abolished the emergence of drug-resistant strains induced by antibiotics.
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Affiliation(s)
- Zhixin Cao
- Department of Otolaryngology, Head and Neck Surgery, Stanford University, 801 Welch Road, Stanford, CA 94305-5739, USA.
- Department of Pathology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, China
| | - Xiaohua Chen
- Department of Otolaryngology, Head and Neck Surgery, Stanford University, 801 Welch Road, Stanford, CA 94305-5739, USA.
- Department of Otolaryngology-Head and Neck Surgery, the First Affiliated Hospital, Zhengzhou University, Zhengzhou 450000, China
| | - Jing Chen
- Department of Otolaryngology, Head and Neck Surgery, Stanford University, 801 Welch Road, Stanford, CA 94305-5739, USA.
| | - Anping Xia
- Department of Otolaryngology, Head and Neck Surgery, Stanford University, 801 Welch Road, Stanford, CA 94305-5739, USA.
| | - Brian Bacacao
- Department of Otolaryngology, Head and Neck Surgery, Stanford University, 801 Welch Road, Stanford, CA 94305-5739, USA.
| | - Jessica Tran
- The Protein and Nucleic Acid Biotechnology Facility, Beckman Center Stanford University, 279 Campus Drive, West Stanford, CA 94305, USA
| | - Devesh Sharma
- Department of Otolaryngology, Head and Neck Surgery, Stanford University, 801 Welch Road, Stanford, CA 94305-5739, USA.
| | - Laurent A Bekale
- Department of Otolaryngology, Head and Neck Surgery, Stanford University, 801 Welch Road, Stanford, CA 94305-5739, USA.
| | - Peter L Santa Maria
- Department of Otolaryngology, Head and Neck Surgery, Stanford University, 801 Welch Road, Stanford, CA 94305-5739, USA.
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Tsuchiya K, Kurohara T, Fukuhara K, Misawa T, Demizu Y. Helical Foldamers and Stapled Peptides as New Modalities in Drug Discovery: Modulators of Protein-Protein Interactions. Processes (Basel) 2022; 10:924. [DOI: 10.3390/pr10050924] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
A “foldamer” is an artificial oligomeric molecule with a regular secondary or tertiary structure consisting of various building blocks. A “stapled peptide” is a peptide with stabilized secondary structures, in particular, helical structures by intramolecular covalent side-chain cross-linking. Helical foldamers and stapled peptides are potential drug candidates that can target protein-protein interactions because they enable multipoint molecular recognition, which is difficult to achieve with low-molecular-weight compounds. This mini-review describes a variety of peptide-based foldamers and stapled peptides with a view to their applications in drug discovery, including our recent progress.
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