1
|
Brar NK, Dhariwal A, Shekhar S, Junges R, Hakansson AP, Petersen FC. HAMLET, a human milk protein-lipid complex, modulates amoxicillin induced changes in an ex vivo biofilm model of the oral microbiome. Front Microbiol 2024; 15:1406190. [PMID: 39101559 PMCID: PMC11254628 DOI: 10.3389/fmicb.2024.1406190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Accepted: 06/17/2024] [Indexed: 08/06/2024] Open
Abstract
Challenges from infections caused by biofilms and antimicrobial resistance highlight the need for novel antimicrobials that work in conjunction with antibiotics and minimize resistance risk. In this study we investigated the composite effect of HAMLET (human alpha-lactalbumin made lethal to tumor cells), a human milk protein-lipid complex and amoxicillin on microbial ecology using an ex vivo oral biofilm model with pooled saliva samples. HAMLET was chosen due to its multi-targeted antimicrobial mechanism, together with its synergistic effect with antibiotics on single species pathogens, and low risk of resistance development. The combination of HAMLET and low concentrations of amoxicillin significantly reduced biofilm viability, while each of them alone had little or no impact. Using a whole metagenomics approach, we found that the combination promoted a remarkable shift in overall microbial composition compared to the untreated samples. A large proportion of the bacterial species in the combined treatment were Lactobacillus crispatus, a species with probiotic effects, whereas it was only detected in a minor fraction in untreated samples. Although resistome analysis indicated no major shifts in alpha-diversity, the results showed the presence of TEM beta-lactamase genes in low proportions in all treated samples but absence in untreated samples. Our study illustrates HAMLET's capability to alter the effects of amoxicillin on the oral microbiome and potentially favor the growth of selected probiotic bacteria when in combination. The findings extend previous knowledge on the combined effects of HAMLET and antibiotics against target pathogens to include potential modulatory effects on polymicrobial biofilms of human origin.
Collapse
Affiliation(s)
- Navdeep Kaur Brar
- Institute of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Achal Dhariwal
- Institute of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Sudhanshu Shekhar
- Institute of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Roger Junges
- Institute of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Anders P. Hakansson
- Institute of Experimental Infection Medicine, Faculty of Medicine, Lund University, Malmö, Sweden
| | | |
Collapse
|
2
|
Zaknoon F, Meir O, Mor A. Mechanistic Studies of Antibiotic Adjuvants Reducing Kidney's Bacterial Loads upon Systemic Monotherapy. Pharmaceutics 2021; 13:pharmaceutics13111947. [PMID: 34834362 PMCID: PMC8621570 DOI: 10.3390/pharmaceutics13111947] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 11/11/2021] [Accepted: 11/14/2021] [Indexed: 12/01/2022] Open
Abstract
We describe the design and attributes of a linear pentapeptide-like derivative (C14(ω5)OOc10O) screened for its ability to elicit bactericidal competences of plasma constituents against Gram-negative bacteria (GNB). In simpler culture media, the lipopeptide revealed high aptitudes to sensitize resilient GNB to hydrophobic and/or efflux-substrate antibiotics, whereas in their absence, C14(ω5)OOc10O only briefly delayed bacterial proliferation. Instead, at low micromolar concentrations, the lipopeptide has rapidly lowered bacterial proton and ATP levels, although significantly less than upon treatment with its bactericidal analog. Mechanistic studies support a two-step scenario providing a plausible explanation for the lipopeptide’s biological outcomes against GNB: initially, C14(ω5)OOc10O permeabilizes the outer membrane similarly to polymyxin B, albeit in a manner not necessitating as much LPS-binding affinity. Subsequently, C14(ω5)OOc10O would interact with the inner membrane gently yet intensively enough to restrain membrane-protein functions such as drug efflux and/or ATP generation, while averting the harsher inner membrane perturbations that mediate the fatal outcome associated with bactericidal peers. Preliminary in vivo studies where skin wound infections were introduced in mice, revealed a significant efficacy in affecting bacterial viability upon topical treatment with creams containing C14(ω5)OOc10O, whereas synergistic combination therapies were able to secure the pathogen’s eradication. Further, capitalizing on the finding that C14(ω5)OOc10O plasma-potentiating concentrations were attainable in mice blood at sub-maximal tolerated doses, we used a urinary tract infection model to acquire evidence for the lipopeptide’s systemic capacity to reduce the kidney’s bacterial loads. Collectively, the data establish the role of C14(ω5)OOc10O as a compelling antibacterial potentiator and suggest its drug-like potential.
Collapse
|
3
|
Terekhova N, Khailova LS, Rokitskaya TI, Nazarov PA, Islamov DR, Usachev KS, Tatarinov DA, Mironov VF, Kotova EA, Antonenko YN. Trialkyl(vinyl)phosphonium Chlorophenol Derivatives as Potent Mitochondrial Uncouplers and Antibacterial Agents. ACS OMEGA 2021; 6:20676-20685. [PMID: 34396013 PMCID: PMC8359139 DOI: 10.1021/acsomega.1c02909] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 07/19/2021] [Indexed: 05/08/2023]
Abstract
Trialkyl phosphonium derivatives of vinyl-substituted p-chlorophenol were synthesized here by a recently developed method of preparing quaternary phosphonium salts from phosphine oxides using Grignard reagents. All the derivatives with a number (n) of carbon atoms in phosphonium alkyl substituents varying from 4 to 7 showed pronounced uncoupling activity in isolated rat liver mitochondria at micromolar concentrations, with a tripentyl derivative being the most effective both in accelerating respiration and causing membrane potential collapse, as well as in provoking mitochondrial swelling in a potassium-acetate medium. Remarkably, the trialkyl phosphonium derivatives with n from 4 to 7 also proved to be rather potent antibacterial agents. Methylation of the chlorophenol hydroxyl group suppressed the effects of P555 and P444 on the respiration and membrane potential of mitochondria but not those of P666, thereby suggesting a mechanistic difference in the mitochondrial uncoupling by these derivatives, which was predominantly protonophoric (carrier-like) in the case of P555 and P444 but detergent-like with P666. The latter was confirmed by the carboxyfluorescein leakage assay on model liposomal membranes.
Collapse
Affiliation(s)
- Natalia
V. Terekhova
- Arbuzov
Institute of Organic and Physical Chemistry, FRC Kazan Scientific
Center of Russian Academy of Sciences, Arbuzov Str. 8, Kazan 420088, Russian Federation
| | - Lyudmila S. Khailova
- Belozersky
Institute of Physico-Chemical Biology, Lomonosov
Moscow State University, Leninskie Gory 1, Moscow 119991, Russian Federation
| | - Tatyana I. Rokitskaya
- Belozersky
Institute of Physico-Chemical Biology, Lomonosov
Moscow State University, Leninskie Gory 1, Moscow 119991, Russian Federation
| | - Pavel A. Nazarov
- Belozersky
Institute of Physico-Chemical Biology, Lomonosov
Moscow State University, Leninskie Gory 1, Moscow 119991, Russian Federation
| | - Daut R. Islamov
- Arbuzov
Institute of Organic and Physical Chemistry, FRC Kazan Scientific
Center of Russian Academy of Sciences, Arbuzov Str. 8, Kazan 420088, Russian Federation
| | - Konstantin S. Usachev
- Institute
of Fundamental Medicine and Biology, Kazan
Federal University, Kremlevskaya 18, Kazan 420008, Russian Federation
| | - Dmitry A. Tatarinov
- Arbuzov
Institute of Organic and Physical Chemistry, FRC Kazan Scientific
Center of Russian Academy of Sciences, Arbuzov Str. 8, Kazan 420088, Russian Federation
| | - Vladimir F. Mironov
- Arbuzov
Institute of Organic and Physical Chemistry, FRC Kazan Scientific
Center of Russian Academy of Sciences, Arbuzov Str. 8, Kazan 420088, Russian Federation
| | - Elena A. Kotova
- Belozersky
Institute of Physico-Chemical Biology, Lomonosov
Moscow State University, Leninskie Gory 1, Moscow 119991, Russian Federation
| | - Yuri N. Antonenko
- Belozersky
Institute of Physico-Chemical Biology, Lomonosov
Moscow State University, Leninskie Gory 1, Moscow 119991, Russian Federation
| |
Collapse
|
4
|
Nazarov PA, Kirsanov RS, Denisov SS, Khailova LS, Karakozova MV, Lyamzaev KG, Korshunova GA, Lukyanov KA, Kotova EA, Antonenko YN. Fluorescein Derivatives as Antibacterial Agents Acting via Membrane Depolarization. Biomolecules 2020; 10:biom10020309. [PMID: 32075319 PMCID: PMC7072581 DOI: 10.3390/biom10020309] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/03/2020] [Accepted: 02/13/2020] [Indexed: 02/06/2023] Open
Abstract
Appending a lipophylic alkyl chain by ester bond to fluorescein has been previously shown to convert this popular dye into an effective protonophoric uncoupler of oxidative phosphorylation in mitochondria, exhibiting neuro- and nephroprotective effects in murine models. In line with this finding, we here report data on the pronounced depolarizing effect of a series of fluorescein decyl esters on bacterial cells. The binding of the fluorescein derivatives to Bacillus subtilis cells was monitored by fluorescence microscopy and fluorescence correlation spectroscopy (FCS). FCS revealed the energy-dependent accumulation of the fluorescein esters with decyl(triphenyl)- and decyl(tri-p-tolyl)phosphonium cations in the bacterial cells. The latter compound proved to be the most potent in suppressing B. subtilis growth.
Collapse
Affiliation(s)
- Pavel A. Nazarov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (R.S.K.); (L.S.K.); (K.G.L.); (G.A.K.); (Y.N.A.)
- Correspondence: (P.A.N.); (E.A.K.)
| | - Roman S. Kirsanov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (R.S.K.); (L.S.K.); (K.G.L.); (G.A.K.); (Y.N.A.)
| | - Stepan S. Denisov
- Department of Biochemistry, University of Maastricht, Cardiovascular Research Institute Maastricht, Universiteitssingel 50, 6229 ER Maastricht, The Netherlands;
| | - Ljudmila S. Khailova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (R.S.K.); (L.S.K.); (K.G.L.); (G.A.K.); (Y.N.A.)
| | - Marina V. Karakozova
- Center of Life Sciences, Skolkovo Institute of Science and Technology, 121205 Moscow, Russia; (M.V.K.); (K.A.L.)
| | - Konstantin G. Lyamzaev
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (R.S.K.); (L.S.K.); (K.G.L.); (G.A.K.); (Y.N.A.)
| | - Galina A. Korshunova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (R.S.K.); (L.S.K.); (K.G.L.); (G.A.K.); (Y.N.A.)
| | - Konstantin A. Lukyanov
- Center of Life Sciences, Skolkovo Institute of Science and Technology, 121205 Moscow, Russia; (M.V.K.); (K.A.L.)
| | - Elena A. Kotova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (R.S.K.); (L.S.K.); (K.G.L.); (G.A.K.); (Y.N.A.)
- Correspondence: (P.A.N.); (E.A.K.)
| | - Yuri N. Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (R.S.K.); (L.S.K.); (K.G.L.); (G.A.K.); (Y.N.A.)
| |
Collapse
|
5
|
Hershkovits AS, Pozdnyakov I, Meir O, Mor A. Sub-inhibitory membrane damage undermines Staphylococcus aureus virulence. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:1172-1179. [PMID: 30974095 DOI: 10.1016/j.bbamem.2019.04.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 12/20/2018] [Accepted: 01/06/2019] [Indexed: 12/15/2022]
Abstract
We investigated antibacterial properties of a recently described membrane-active lipopeptide, C10OOc12O (decanoyl-ornithyl-ornithyl-dodecanoyl-ornithyl-amide) against Gram-positive bacteria (GPB). Minimal inhibitory concentrations (MICs) and kinetics were compared in culture media and plasma. Chemo-sensitization to antibiotics was determined using the checkerboard assay. Membrane damages were estimated using diverse membrane potential sensitive dyes. ATP levels and relevant enzymes activities were measured using commercial bioassay kits. While relatively weakly active in simple culture media, sub-MIC levels (~ten-fold) of C10OOc12O have significantly improved the antibacterial function of Human plasma. Mechanistic studies indicated that C10OOc12O-treated bacteria have sustained mild membrane damage(s) in association with rapid (within 2 min) but low (<10%) dissipation of the trans-membrane potential; Intracellular ATP levels were transiently reduced (~20%) whereas extracellular ATP increased only at MIC values; Sub-inhibitory concentrations were sufficient for inhibiting major agr-regulated virulence factors (lipase and α-toxin) and for sensitizing MRSA USA300 to the antibiotic oxacillin to the point of reverting the bacteria status from oxacillin-resistant to oxacillin-sensitive (i.e., oxacillin MIC was reduced from 32 to 0.1 mg/l). These findings argue that by means of mild depolarization, C10OOc12O affects the quorum sensing regulator in a manner that transiently weakens bacterial defenses, thereby enforcing studies that support the potential usefulness of fighting S. aureus (and possibly other GPB) infections, by targeting its virulence.
Collapse
Affiliation(s)
- Ayelet Sarah Hershkovits
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Igor Pozdnyakov
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Ohad Meir
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Amram Mor
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, Israel.
| |
Collapse
|
6
|
Antibiotic Hybrids: the Next Generation of Agents and Adjuvants against Gram-Negative Pathogens? Clin Microbiol Rev 2018. [PMID: 29540434 DOI: 10.1128/cmr.00077-17] [Citation(s) in RCA: 176] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The global incidence of drug-resistant Gram-negative bacillary infections has been increasing, and there is a dire need to develop novel strategies to overcome this problem. Intrinsic resistance in Gram-negative bacteria, such as their protective outer membrane and constitutively overexpressed efflux pumps, is a major survival weapon that renders them refractory to current antibiotics. Several potential avenues to overcome this problem have been at the heart of antibiotic drug discovery in the past few decades. We review some of these strategies, with emphasis on antibiotic hybrids either as stand-alone antibacterial agents or as adjuvants that potentiate a primary antibiotic in Gram-negative bacteria. Antibiotic hybrid is defined in this review as a synthetic construct of two or more pharmacophores belonging to an established agent known to elicit a desired antimicrobial effect. The concepts, advances, and challenges of antibiotic hybrids are elaborated in this article. Moreover, we discuss several antibiotic hybrids that were or are in clinical evaluation. Mechanistic insights into how tobramycin-based antibiotic hybrids are able to potentiate legacy antibiotics in multidrug-resistant Gram-negative bacilli are also highlighted. Antibiotic hybrids indeed have a promising future as a therapeutic strategy to overcome drug resistance in Gram-negative pathogens and/or expand the usefulness of our current antibiotic arsenal.
Collapse
|
7
|
Improved conductivity and antibacterial activity of poly(2-aminothiophenol)-silver nanocomposite against human pathogens. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 178:323-329. [DOI: 10.1016/j.jphotobiol.2017.11.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 11/15/2017] [Accepted: 11/20/2017] [Indexed: 02/06/2023]
|
8
|
Jammal J, Zaknoon F, Mor A. Eliciting improved antibacterial efficacy of host proteins in the presence of antibiotics. FASEB J 2017; 32:369-376. [DOI: 10.1096/fj.201700652r] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 08/28/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Joanna Jammal
- Department of Biotechnology and Food EngineeringTechnion‐Israel Institute of Technology Haifa Israel
| | - Fadia Zaknoon
- Department of Biotechnology and Food EngineeringTechnion‐Israel Institute of Technology Haifa Israel
| | - Amram Mor
- Department of Biotechnology and Food EngineeringTechnion‐Israel Institute of Technology Haifa Israel
| |
Collapse
|
9
|
Uppu DSSM, Konai MM, Sarkar P, Samaddar S, Fensterseifer ICM, Farias-Junior C, Krishnamoorthy P, Shome BR, Franco OL, Haldar J. Membrane-active macromolecules kill antibiotic-tolerant bacteria and potentiate antibiotics towards Gram-negative bacteria. PLoS One 2017; 12:e0183263. [PMID: 28837596 PMCID: PMC5570306 DOI: 10.1371/journal.pone.0183263] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 08/01/2017] [Indexed: 12/11/2022] Open
Abstract
Chronic bacterial biofilms place a massive burden on healthcare due to the presence of antibiotic-tolerant dormant bacteria. Some of the conventional antibiotics such as erythromycin, vancomycin, linezolid, rifampicin etc. are inherently ineffective against Gram-negative bacteria, particularly in their biofilms. Here, we report membrane-active macromolecules that kill slow dividing stationary-phase and antibiotic tolerant cells of Gram-negative bacteria. More importantly, these molecules potentiate antibiotics (erythromycin and rifampicin) to biofilms of Gram-negative bacteria. These molecules eliminate planktonic bacteria that are liberated after dispersion of biofilms (dispersed cells). The membrane-active mechanism of these molecules forms the key for potentiating the established antibiotics. Further, we demonstrate that the combination of macromolecules and antibiotics significantly reduces bacterial burden in mouse burn and surgical wound infection models caused by Acinetobacter baumannii and Carbapenemase producing Klebsiella pneumoniae (KPC) clinical isolate respectively. Colistin, a well-known antibiotic targeting the lipopolysaccharide (LPS) of Gram-negative bacteria fails to kill antibiotic tolerant cells and dispersed cells (from biofilms) and bacteria develop resistance to it. On the contrary, these macromolecules prevent or delay the development of bacterial resistance to known antibiotics. Our findings emphasize the potential of targeting the bacterial membrane in antibiotic potentiation for disruption of biofilms and suggest a promising strategy towards developing therapies for topical treatment of Gram-negative infections.
Collapse
Affiliation(s)
- Divakara S. S. M. Uppu
- Chemical Biology & Medicinal Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka, India
| | - Mohini M. Konai
- Chemical Biology & Medicinal Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka, India
| | - Paramita Sarkar
- Chemical Biology & Medicinal Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka, India
| | - Sandip Samaddar
- Chemical Biology & Medicinal Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka, India
| | - Isabel C. M. Fensterseifer
- Centro de Análises Proteômicas e Bioquímicas, Pós-Graduação em Ciências Genômicas e Biotecnologia UC, Brası´lia, Brazil
- Molecular Pathology Post-Graduate Program, University of Brasília, Brasília, Brazil
| | | | - Paramanandam Krishnamoorthy
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Bengaluru, Karnataka, India
| | - Bibek R. Shome
- ICAR-National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Bengaluru, Karnataka, India
| | - Octávio L. Franco
- Centro de Análises Proteômicas e Bioquímicas, Pós-Graduação em Ciências Genômicas e Biotecnologia UC, Brası´lia, Brazil
- Molecular Pathology Post-Graduate Program, University of Brasília, Brasília, Brazil
- S-inova Biotech, Pos-Graduação em Biotecnoloia, Universidade Catolica Dom Bosco, Campo Grande, Brazil
| | - Jayanta Haldar
- Chemical Biology & Medicinal Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka, India
- * E-mail:
| |
Collapse
|
10
|
Meir O, Zaknoon F, Cogan U, Mor A. A broad-spectrum bactericidal lipopeptide with anti-biofilm properties. Sci Rep 2017; 7:2198. [PMID: 28526864 PMCID: PMC5438364 DOI: 10.1038/s41598-017-02373-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 04/10/2017] [Indexed: 11/30/2022] Open
Abstract
Previous studies of the oligoacyllysyl (OAK) series acyl-lysyl-lysyl-aminoacyl-lysine-amide, suggested their utility towards generating robust linear lipopeptide-like alternatives to antibiotics, although to date, none exhibited potent broad-spectrum bactericidal activity. To follow up on this premise, we produced a new analog (C14KKc12K) and investigated its properties in various media. Mechanistic studies suggest that C14KKc12K uses a non-specific membrane-disruptive mode of action for rapidly reducing viability of Gram-negative bacteria (GNB) similarly to polymyxin B (PMB), a cyclic lipopeptide used as last resort antibiotic. Indeed, C14KKc12K displayed similar affinity for lipopolysaccharides and induced cell permeabilization associated with rapid massive membrane depolarization. Unlike PMB however, C14KKc12K was also bactericidal to Gram-positive bacteria (GPB) at or near the minimal inhibitory concentration (MIC), as assessed against a multispecies panel of >50 strains, displaying MIC50 at 3 and 6 µM, respectively for GPB and GNB. C14KKc12K retained activity in human saliva, reducing the viability of cultivable oral microflora by >99% within two minutes of exposure, albeit at higher concentrations, which, nonetheless, were similar to the commercial gold standard, chlorhexidine. This equipotent bactericidal activity was also observed in pre-formed biofilms of Streptococcus mutans, a major periodontal pathogen. Such compounds therefore, may be useful for eradication of challenging poly-microbial infections.
Collapse
Affiliation(s)
- Ohad Meir
- Department of Biotechnology & Food Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel
| | - Fadia Zaknoon
- Department of Biotechnology & Food Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel
| | - Uri Cogan
- Department of Biotechnology & Food Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel
| | - Amram Mor
- Department of Biotechnology & Food Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel.
| |
Collapse
|
11
|
Mitochondria-targeted antioxidants as highly effective antibiotics. Sci Rep 2017; 7:1394. [PMID: 28469140 PMCID: PMC5431119 DOI: 10.1038/s41598-017-00802-8] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 03/13/2017] [Indexed: 12/17/2022] Open
Abstract
Mitochondria-targeted antioxidants are known to alleviate mitochondrial oxidative damage that is associated with a variety of diseases. Here, we showed that SkQ1, a decyltriphenyl phosphonium cation conjugated to a quinone moiety, exhibited strong antibacterial activity towards Gram-positive Bacillus subtilis, Mycobacterium sp. and Staphylococcus aureus and Gram-negative Photobacterium phosphoreum and Rhodobacter sphaeroides in submicromolar and micromolar concentrations. SkQ1 exhibited less antibiotic activity towards Escherichia coli due to the presence of the highly effective multidrug resistance pump AcrAB-TolC. E. coli mutants lacking AcrAB-TolC showed similar SkQ1 sensitivity, as B. subtilis. Lowering of the bacterial membrane potential by SkQ1 might be involved in the mechanism of its bactericidal action. No significant cytotoxic effect on mammalian cells was observed at bacteriotoxic concentrations of SkQ1. Therefore, SkQ1 may be effective in protection of the infected mammals by killing invading bacteria.
Collapse
|
12
|
Yang X, Goswami S, Gorityala BK, Domalaon R, Lyu Y, Kumar A, Zhanel GG, Schweizer F. A Tobramycin Vector Enhances Synergy and Efficacy of Efflux Pump Inhibitors against Multidrug-Resistant Gram-Negative Bacteria. J Med Chem 2017; 60:3913-3932. [DOI: 10.1021/acs.jmedchem.7b00156] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Xuan Yang
- Department
of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Sudeep Goswami
- Department
of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | | | - Ronald Domalaon
- Department
of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Yinfeng Lyu
- Department
of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
- Institute
of Animal Nutrition, Northeast Agricultural University, Harbin, Heilongjiang 150030, P.R. China
| | - Ayush Kumar
- Department
of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
- Department
of Medical Microbiology, University of Manitoba, Winnipeg, MB R3T 1R9, Canada
| | - George G. Zhanel
- Department
of Medical Microbiology, University of Manitoba, Winnipeg, MB R3T 1R9, Canada
| | - Frank Schweizer
- Department
of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
- Department
of Medical Microbiology, University of Manitoba, Winnipeg, MB R3T 1R9, Canada
| |
Collapse
|
13
|
Lyu Y, Yang X, Goswami S, Gorityala BK, Idowu T, Domalaon R, Zhanel GG, Shan A, Schweizer F. Amphiphilic Tobramycin-Lysine Conjugates Sensitize Multidrug Resistant Gram-Negative Bacteria to Rifampicin and Minocycline. J Med Chem 2017; 60:3684-3702. [PMID: 28409644 DOI: 10.1021/acs.jmedchem.6b01742] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Chromosomally encoded low membrane permeability and highly efficient efflux systems are major mechanisms by which Pseudomonas aeruginosa evades antibiotic actions. Our previous reports have shown that amphiphilic tobramycin-fluoroquinolone hybrids can enhance efficacy of fluoroquinolone antibiotics against multidrug-resistant (MDR) P. aeruginosa isolates. Herein, we report on a novel class of tobramycin-lysine conjugates containing an optimized amphiphilic tobramycin-C12 tether that sensitize Gram-negative bacteria to legacy antibiotics. Combination studies indicate the ability of these conjugates to synergize rifampicin and minocycline against MDR and extensively drug resistant (XDR) P. aeruginosa isolates and enhance efficacy of both antibiotics in the Galleria mellonella larvae in vivo infection model. Mode of action studies indicate that the amphiphilic tobramycin-lysine adjuvants enhance outer membrane cell penetration and affect the proton motive force, which energizes efflux pumps. Overall, this study provides a strategy for generating effective antibiotic adjuvants that overcome resistance of rifampicin and minocycline in MDR and XDR Gram-negative bacteria including P. aeruginosa.
Collapse
Affiliation(s)
- Yinfeng Lyu
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin, Heilongjiang 150030, P.R. China.,Department of Chemistry, University of Manitoba , Winnipeg, MB R3T 2N2, Canada
| | - Xuan Yang
- Department of Chemistry, University of Manitoba , Winnipeg, MB R3T 2N2, Canada
| | - Sudeep Goswami
- Department of Chemistry, University of Manitoba , Winnipeg, MB R3T 2N2, Canada
| | | | - Temilolu Idowu
- Department of Chemistry, University of Manitoba , Winnipeg, MB R3T 2N2, Canada
| | - Ronald Domalaon
- Department of Chemistry, University of Manitoba , Winnipeg, MB R3T 2N2, Canada
| | - George G Zhanel
- Department of Medical Microbiology/Infectious Diseases, University of Manitoba , Winnipeg, MB R3T 1R9, Canada
| | - Anshan Shan
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin, Heilongjiang 150030, P.R. China
| | - Frank Schweizer
- Department of Chemistry, University of Manitoba , Winnipeg, MB R3T 2N2, Canada.,Department of Medical Microbiology/Infectious Diseases, University of Manitoba , Winnipeg, MB R3T 1R9, Canada
| |
Collapse
|
14
|
Jammal J, Zaknoon F, Kaneti G, Hershkovits AS, Mor A. Sensitization of Gram-Negative Bacilli to Host Antibacterial Proteins. J Infect Dis 2017; 215:1599-1607. [DOI: 10.1093/infdis/jix119] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 03/02/2017] [Indexed: 12/17/2022] Open
|
15
|
Alkyl-substituted phenylamino derivatives of 7-nitrobenz-2-oxa-1,3-diazole as uncouplers of oxidative phosphorylation and antibacterial agents: involvement of membrane proteins in the uncoupling action. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:377-387. [DOI: 10.1016/j.bbamem.2016.12.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 12/15/2016] [Accepted: 12/19/2016] [Indexed: 11/19/2022]
|
16
|
Malik E, Dennison SR, Harris F, Phoenix DA. pH Dependent Antimicrobial Peptides and Proteins, Their Mechanisms of Action and Potential as Therapeutic Agents. Pharmaceuticals (Basel) 2016; 9:ph9040067. [PMID: 27809281 PMCID: PMC5198042 DOI: 10.3390/ph9040067] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 10/25/2016] [Accepted: 10/26/2016] [Indexed: 12/16/2022] Open
Abstract
Antimicrobial peptides (AMPs) are potent antibiotics of the innate immune system that have been extensively investigated as a potential solution to the global problem of infectious diseases caused by pathogenic microbes. A group of AMPs that are increasingly being reported are those that utilise pH dependent antimicrobial mechanisms, and here we review research into this area. This review shows that these antimicrobial molecules are produced by a diverse spectrum of creatures, including vertebrates and invertebrates, and are primarily cationic, although a number of anionic examples are known. Some of these molecules exhibit high pH optima for their antimicrobial activity but in most cases, these AMPs show activity against microbes that present low pH optima, which reflects the acidic pH generally found at their sites of action, particularly the skin. The modes of action used by these molecules are based on a number of major structure/function relationships, which include metal ion binding, changes to net charge and conformational plasticity, and primarily involve the protonation of histidine, aspartic acid and glutamic acid residues at low pH. The pH dependent activity of pore forming antimicrobial proteins involves mechanisms that generally differ fundamentally to those used by pH dependent AMPs, which can be described by the carpet, toroidal pore and barrel-stave pore models of membrane interaction. A number of pH dependent AMPs and antimicrobial proteins have been developed for medical purposes and have successfully completed clinical trials, including kappacins, LL-37, histatins and lactoferrin, along with a number of their derivatives. Major examples of the therapeutic application of these antimicrobial molecules include wound healing as well as the treatment of multiple cancers and infections due to viruses, bacteria and fungi. In general, these applications involve topical administration, such as the use of mouth washes, cream formulations and hydrogel delivery systems. Nonetheless, many pH dependent AMPs and antimicrobial proteins have yet to be fully characterized and these molecules, as a whole, represent an untapped source of novel biologically active agents that could aid fulfillment of the urgent need for alternatives to conventional antibiotics, helping to avert a return to the pre-antibiotic era.
Collapse
Affiliation(s)
- Erum Malik
- School of Forensic and Applied Sciences, University of Central Lancashire, Preston PR1 2HE, UK.
| | - Sarah R Dennison
- School of Pharmacy and Biological Sciences, University of Central Lancashire, Preston PR1 2HE, UK.
| | - Frederick Harris
- School of Forensic and Applied Sciences, University of Central Lancashire, Preston PR1 2HE, UK.
| | - David A Phoenix
- Office of the Vice Chancellor, London South Bank University, 103 Borough Road, London SE1 0AA, UK.
| |
Collapse
|