1
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Woods KE, Akhter S, Rodriguez B, Townsend KA, Smith N, Smith B, Wambua A, Craddock V, Abisado-Duque RG, Santa EE, Manson DE, Oakley BR, Hancock LE, Miao Y, Blackwell HE, Chandler JR. Characterization of natural product inhibitors of quorum sensing reveals competitive inhibition of Pseudomonas aeruginosa RhlR by ortho-vanillin. Microbiol Spectr 2024; 12:e0068124. [PMID: 39046261 PMCID: PMC11370260 DOI: 10.1128/spectrum.00681-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Accepted: 05/15/2024] [Indexed: 07/25/2024] Open
Abstract
Quorum sensing (QS) is a cell-cell signaling system that enables bacteria to coordinate population density-dependent changes in behavior. This chemical communication pathway is mediated by diffusible N-acyl L-homoserine lactone signals and cytoplasmic signal-responsive LuxR-type receptors in Gram-negative bacteria. As many common pathogenic bacteria use QS to regulate virulence, there is significant interest in disrupting QS as a potential therapeutic strategy. Prior studies have implicated the natural products salicylic acid, cinnamaldehyde, and other related benzaldehyde derivatives as inhibitors of QS in the opportunistic pathogen Pseudomonas aeruginosa, yet we lack an understanding of the mechanisms by which these compounds function. Herein, we evaluate the activity of a set of benzaldehyde derivatives using heterologous reporters of the P. aeruginosa LasR and RhlR QS signal receptors. We find that most tested benzaldehyde derivatives can antagonize LasR or RhlR reporter activation at micromolar concentrations, although certain molecules also cause mild growth defects and nonspecific reporter antagonism. Notably, several compounds showed promising RhlR or LasR-specific inhibitory activities over a range of concentrations below that causing toxicity. ortho-Vanillin, a previously untested compound, was the most promising within this set. Competition experiments against the native ligands for LasR and RhlR revealed that ortho-vanillin can interact competitively with RhlR but not with LasR. Overall, these studies expand our understanding of benzaldehyde activities in the LasR and RhlR receptors and reveal potentially promising effects of ortho-vanillin as a small molecule QS modulator against RhlR. IMPORTANCE Quorum sensing (QS) regulates many aspects of bacterial pathogenesis and has attracted much interest as a target for anti-virulence therapies over the past 30 years, for example, antagonists of the LasR and RhlR QS receptors in Pseudomonas aeruginosa. Potent and selective QS inhibitors remain relatively scarce. However, natural products have provided a bounty of chemical scaffolds with anti-QS activities, but their molecular mechanisms are poorly characterized. The current study serves to fill this void by examining the activity of an important and wide-spread class of natural product QS modulators, benzaldehydes, and related derivatives, in LasR and RhlR. We demonstrate that ortho-vanillin can act as a competitive inhibitor of RhlR, a receptor that has emerged and may supplant LasR in certain settings as a target for P. aeruginosa QS control. The results and insights provided herein will advance the design of chemical tools to study QS with improved activities and selectivities.
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Affiliation(s)
- Kathryn E. Woods
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | - Sana Akhter
- Center for Computational Biology, University of Kansas, Lawrence, Kansas, USA
| | - Blanca Rodriguez
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | - Kade A. Townsend
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | - Nathan Smith
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | - Ben Smith
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | - Alice Wambua
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | - Vaughn Craddock
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | | | - Emma E. Santa
- Department of Chemistry, University of Wisconsin–Madison, Madison, Wisconsin, USA
| | - Daniel E. Manson
- Department of Chemistry, University of Wisconsin–Madison, Madison, Wisconsin, USA
| | - Berl R. Oakley
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | - Lynn E. Hancock
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | - Yinglong Miao
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
- Center for Computational Biology, University of Kansas, Lawrence, Kansas, USA
| | - Helen E. Blackwell
- Department of Chemistry, University of Wisconsin–Madison, Madison, Wisconsin, USA
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2
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Principi N, Esposito S. Biofilm Production and Its Implications in Pediatrics. Microorganisms 2024; 12:1522. [PMID: 39203365 PMCID: PMC11356046 DOI: 10.3390/microorganisms12081522] [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: 07/02/2024] [Revised: 07/16/2024] [Accepted: 07/17/2024] [Indexed: 09/03/2024] Open
Abstract
Biofilms, aggregates of bacteria enclosed in a self-produced matrix, have been implicated in various pediatric respiratory infections, including acute otitis media (AOM), otitis media with effusion (OME), adenoiditis, protracted bacterial bronchitis, and pulmonary exacerbations in cystic fibrosis. These infections are prevalent in children and often associated with biofilm-producing pathogens, leading to recurrent and chronic conditions. Biofilms reduce antibiotic efficacy, contributing to treatment failure and disease persistence. This narrative review discusses biofilm production by respiratory pathogens such as Streptococcus pneumoniae, non-typeable Haemophilus influenzae, Pseudomonas aeruginosa, and Staphylococcus aureus. It examines their mechanisms of biofilm formation, antibiotic resistance, and the challenges they present in clinical treatment. Various antibiofilm strategies have shown promise in vitro and in animal studies, including the use of N-acetylcysteine, enzymes like dispersin B, and agents disrupting quorum sensing and biofilm matrix components. However, their clinical application, particularly in children, remains limited. Traditional treatments for biofilm-associated diseases have not significantly evolved, even with biofilm detection. The transition from experimental findings to clinical practice is complex and requires robust clinical trials and standardized biofilm detection protocols. Addressing biofilms in pediatric respiratory infections is crucial for improving treatment outcomes and managing recurrent and chronic diseases effectively.
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Affiliation(s)
| | - Susanna Esposito
- Pediatric Clinic, Department of Medicine and Surgery, University of Parma, 43126 Parma, Italy
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3
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Du J, Li J, Wen J, Liu J, Xiao H, Zhang A, Yang D, Sun P, Zhou H, Xu J. A Systematic Hierarchical Virtual Screening Model for RhlR Inhibitors Based on PCA, Pharmacophore, Docking, and Molecular Dynamics. Int J Mol Sci 2024; 25:8000. [PMID: 39063243 PMCID: PMC11276863 DOI: 10.3390/ijms25148000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2024] [Revised: 07/16/2024] [Accepted: 07/18/2024] [Indexed: 07/28/2024] Open
Abstract
RhlR plays a key role in the quorum sensing of Pseudomonas aeruginosa. The current structure-activity relationship (SAR) studies of RhlR inhibitors mainly focus on elucidating the functional groups. Based on a systematic review of previous research on RhlR inhibitors, this study aims to establish a systematic, hierarchical screening model for RhlR inhibitors. We initially established a database and utilized principal component analysis (PCA) to categorize the inhibitors into two classes. Based on the training set, pharmacophore models were established to elucidate the structural characteristics of ligands. Subsequently, molecular docking, molecular dynamics simulations, and the calculation of binding free energy and strain energy were performed to validate the crucial interactions between ligands and receptors. Then, the screening criteria for RhlR inhibitors were established hierarchically based on ligand structure characteristics, ligand-receptor interaction, and receptor affinity. Test sets were finally employed to validate the hierarchical virtual screening model by comparing it with the current SAR studies of RhlR inhibitors. The hierarchical screening model was confirmed to possess higher accuracy and a true positive rate, which holds promise for subsequent screening and the discovery of active RhlR inhibitors.
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Affiliation(s)
- Jiarui Du
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
| | - Jiahao Li
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Jinan University, Guangzhou 510632, China
| | - Juqi Wen
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Jinan University, Guangzhou 510632, China
| | - Jun Liu
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Jinan University, Guangzhou 510632, China
| | - Haichuan Xiao
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
| | - Antian Zhang
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
| | - Dongdong Yang
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
| | - Pinghua Sun
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Jinan University, Guangzhou 510632, China
- Key Laboratory of Xinjiang Phytomedicine Resource and Utilization, Ministry of Education, School of Pharmacy, Shihezi University, Shihezi 832003, China
| | - Haibo Zhou
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Jinan University, Guangzhou 510632, China
| | - Jun Xu
- College of Pharmacy, Jinan University, Guangzhou 511436, China; (J.D.); (J.L.); (J.W.); (J.L.); (H.X.); (A.Z.); (D.Y.); (P.S.)
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Jinan University, Guangzhou 510632, China
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4
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Zhang Q, Soulère L, Queneau Y. Amide bioisosteric replacement in the design and synthesis of quorum sensing modulators. Eur J Med Chem 2024; 273:116525. [PMID: 38801798 DOI: 10.1016/j.ejmech.2024.116525] [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: 03/13/2024] [Revised: 05/08/2024] [Accepted: 05/20/2024] [Indexed: 05/29/2024]
Abstract
The prevention or control of bacterial infections requires continuous search for novel approaches among which bacterial quorum sensing inhibition is considered as a complementary antibacterial strategy. Quorum sensing, used by many different bacteria, functions through a cell-to-cell communication mechanism relying on chemical signals, referred to as autoinducers, such as N-acyl homoserine lactones (AHLs) which are the most common chemical signals in this system. Designing analogs of these autoinducers is one of the possible ways to interfere with quorum sensing. Since bioisosteres are powerful tools in medicinal chemistry, targeting analogs of AHLs or other signal molecules and mimics of known QS modulators built on amide bond bioisosteres is a relevant strategy in molecular design and synthetic routes. This review highlights the application of amide bond bioisosteric replacement in the design and synthesis of novel quorum sensing inhibitors.
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Affiliation(s)
- Qiang Zhang
- Hubei Key Laboratory of Purification and Application of Plant Anti-cancer Active Ingredients, Hubei University of Education, 129 Second Gaoxin Road, Wuhan 430205, China
| | - Laurent Soulère
- INSA Lyon, CNRS, Universite Claude Bernard Lyon 1, UMR 5246, ICBMS, Bât. E. Lederer, 1 rue Victor Grignard, F-69622, Villeurbanne, France
| | - Yves Queneau
- INSA Lyon, CNRS, Universite Claude Bernard Lyon 1, UMR 5246, ICBMS, Bât. E. Lederer, 1 rue Victor Grignard, F-69622, Villeurbanne, France.
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5
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Manson DE, Ananiev GE, Guo S, Ericksen SS, Santa EE, Blackwell HE. Abiotic Small Molecule Inhibitors and Activators of the LasR Quorum Sensing Receptor in Pseudomonas aeruginosa with Potencies Comparable or Surpassing N-Acyl Homoserine Lactones. ACS Infect Dis 2024; 10:1212-1221. [PMID: 38506163 PMCID: PMC11014758 DOI: 10.1021/acsinfecdis.3c00593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
The opportunistic pathogen Pseudomonas aeruginosa controls almost 10% of its genome, including myriad virulence genes, via a cell-to-cell chemical communication system called quorum sensing (QS). Small molecules that either inhibit or activate QS in P. aeruginosa represent useful research tools to study the role of this signaling pathway in infection and interrogate its viability as an antivirulence target. However, despite active research in this area over the past 20+ years, there are relatively few synthetic compounds known to strongly inhibit or activate QS in P. aeruginosa. Most reported QS modulators in this pathogen are of low potency or have structural liabilities that limit their application in biologically relevant environments such as mimics of the native N-acyl l-homoserine lactone (AHL) signals. Here, we report the results of a high-throughput screen for abiotic small molecules that target LasR, a key QS regulator in P. aeruginosa. We screened a 25,000-compound library and discovered four new structural classes of abiotic LasR modulators. These compounds include antagonists that surpass the potency of all known AHL-type compounds and mimetics thereof, along with an agonist with potency approaching that of LasR's native ligand. The novel structures of this compound set, along with their anticipated robust physicochemical profiles, underscore their potential value as probe molecules to interrogate the roles of QS in this formidable pathogen.
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Affiliation(s)
- Daniel E Manson
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin 53706, United States
| | - Gene E Ananiev
- Small Molecule Screening Facility, University of Wisconsin Carbone Cancer Center, 600 Highland Ave., Madison, Wisconsin 53792, United States
| | - Song Guo
- Small Molecule Screening Facility, University of Wisconsin Carbone Cancer Center, 600 Highland Ave., Madison, Wisconsin 53792, United States
| | - Spencer S Ericksen
- Small Molecule Screening Facility, University of Wisconsin Carbone Cancer Center, 600 Highland Ave., Madison, Wisconsin 53792, United States
| | - Emma E Santa
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin 53706, United States
| | - Helen E Blackwell
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin 53706, United States
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6
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Woods KE, Akhter S, Rodriguez B, Townsend KA, Smith N, Smith B, Wambua A, Craddock V, Abisado-Duque RG, Santa EE, Manson DE, Oakley BR, Hancock LE, Miao Y, Blackwell HE, Chandler JR. Characterization of natural product inhibitors of quorum sensing in Pseudomonas aeruginosa reveals competitive inhibition of RhlR by ortho-vanillin. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.24.581676. [PMID: 38559250 PMCID: PMC10979890 DOI: 10.1101/2024.02.24.581676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Quorum sensing (QS) is a cell-cell signaling system that enables bacteria to coordinate population density-dependent changes in behavior. This chemical communication pathway is mediated by diffusible N-acyl L-homoserine lactone signals and cytoplasmic signal-responsive LuxR-type receptors in Gram-negative bacteria. As many common pathogenic bacteria use QS to regulate virulence, there is significant interest in disrupting QS as a potential therapeutic strategy. Prior studies have implicated the natural products salicylic acid, cinnamaldehyde and other related benzaldehyde derivatives as inhibitors of QS in the opportunistic pathogen Pseudomonas aeruginosa, yet we lack an understanding of the mechanisms by which these compounds function. Herein, we evaluate the activity of a set of benzaldehyde derivatives using heterologous reporters of the P. aeruginosa LasR and RhlR QS signal receptors. We find that most tested benzaldehyde derivatives can antagonize LasR or RhlR reporter activation at micromolar concentrations, although certain molecules also caused mild growth defects and nonspecific reporter antagonism. Notably, several compounds showed promising RhlR or LasR specific inhibitory activities over a range of concentrations below that causing toxicity. Ortho-Vanillin, a previously untested compound, was the most promising within this set. Competition experiments against the native ligands for LasR and RhlR revealed that ortho-vanillin can interact competitively with RhlR but not with LasR. Overall, these studies expand our understanding of benzaldehyde activities in the LasR and RhlR receptors and reveal potentially promising effects of ortho-vanillin as a small molecule QS modulator against RhlR.
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Affiliation(s)
- Kathryn E. Woods
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
| | - Sana Akhter
- Center for Computational Biology, University of Kansas, Lawrence, KS 66045
| | - Blanca Rodriguez
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
| | - Kade A. Townsend
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
| | - Nathan Smith
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
| | - Ben Smith
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
| | - Alice Wambua
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
| | - Vaughn Craddock
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
| | | | - Emma E. Santa
- Department of Chemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Daniel E. Manson
- Department of Chemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Berl R. Oakley
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
| | - Lynn E. Hancock
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
| | - Yinglong Miao
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045
- Center for Computational Biology, University of Kansas, Lawrence, KS 66045
- Current location: Department of Pharmacology and Computational Medicine Program, University of North Carolina–Chapel Hill, Chapel Hill, NC 27599
| | - Helen E. Blackwell
- Department of Chemistry, University of Wisconsin–Madison, Madison, WI 53706
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7
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Gvozdev MY, Turomsha IS, Savich VV, Faletrov YV, Sidarenka AV, Shkumatov VM, Loginova NV. Sterically hindered phenolic derivatives: effect on the production of Pseudomonas aeruginosa virulence factors, high-throughput virtual screening and ADME properties prediction. Arch Microbiol 2024; 206:91. [PMID: 38316691 DOI: 10.1007/s00203-023-03827-y] [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: 11/16/2023] [Revised: 12/13/2023] [Accepted: 12/30/2023] [Indexed: 02/07/2024]
Abstract
Inhibition of quorum sensing is considered to be an effective strategy of control and treatment of a wide range of acute and persistent infections. Pseudomonas aeruginosa is an opportunistic bacterium with a high adaptation potential that contributes to healthcare-associated infections. In the present study, the effects of the synthesized hybrid structures bearing sterically hindered phenolic and heterocyclic moieties in a single scaffold on the production of virulence factors by P. aeruginosa were determined. It has been shown that the obtained compounds significantly reduce both pyocyanin and alginate production and stimulate the biosynthesis of siderophores in vitro, which may be attributed to their iron-chelating properties. The results of docking-based inverse high-throughput virtual screening indicate that transcription regulator LasR and Cu-transporter OPRC could be potential molecular targets for these compounds. Investigation of the impact small molecules exert on the molecular mechanisms of the production of bacterial virulence factors may pave the way for the design and development of novel antibacterial agents.
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Affiliation(s)
- Maxim Y Gvozdev
- Faculty of Chemistry, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus
- Research Institute for Physical Chemical Problems, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus
| | - Iveta S Turomsha
- Faculty of Chemistry, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus
- Research Institute for Physical Chemical Problems, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus
| | - Viktoryia V Savich
- Institute of Microbiology of the National Academy of Sciences of Belarus, Minsk, Belarus
| | - Yaroslav V Faletrov
- Faculty of Chemistry, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus
- Research Institute for Physical Chemical Problems, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus
| | - Anastasiya V Sidarenka
- Institute of Microbiology of the National Academy of Sciences of Belarus, Minsk, Belarus
| | - Vladimir M Shkumatov
- Faculty of Chemistry, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus
- Research Institute for Physical Chemical Problems, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus
| | - Natalia V Loginova
- Faculty of Chemistry, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus.
- Research Institute for Physical Chemical Problems, Belarusian State University, Leningradskaya Str. 14, Minsk, Belarus.
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8
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Miao ZY, Zhang XY, Yang MH, Huang YJ, Lin J, Chen WM. 3-Hydroxypyridin-4(1 H)-one Derivatives as pqs Quorum Sensing Inhibitors Attenuate Virulence and Reduce Antibiotic Resistance in Pseudomonas aeruginosa. J Med Chem 2023; 66:15823-15846. [PMID: 37978953 DOI: 10.1021/acs.jmedchem.3c01328] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
The development of quorum sensing inhibitors capable of decreasing the production of virulence factors is an effective strategy to overcome resistance in Pseudomonas aeruginosa due to the less selective pressure exerted on bacteria. In this study, a series of 3-hydroxypyridin-4(1H)-one derivatives bearing a 4-aminomethyl-1,2,3-triazole linker were designed and synthesized as antivirulence agents against P. aeruginosa. The most potent derivative 16e was identified as a selective inhibitor of the pqs system (IC50 = 3.7 μM) and its related virulence factor pyocyanin (IC50 = 2.7 μM). In addition, 16e exhibited moderate biofilm inhibition and significant inhibition of P. aeruginosa motility phenotypes with low cytotoxicity. Compound 16e showed an obvious antibacterial synergistic effect in combination with antibiotics such as ciprofloxacin and tobramycin in in vitro and in vivo Caenorhabditis elegans infection models. Overall, the excellent antivirulence properties of compound 16e make it a potential antibiotic adjuvant for the treatment of P. aeruginosa infections that may be advanced into preclinical development in the future.
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Affiliation(s)
- Zhi-Ying Miao
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, #855 Xingye Avenue, Guangzhou 511400, China
| | - Xiao-Yi Zhang
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, #855 Xingye Avenue, Guangzhou 511400, China
| | - Ming-Han Yang
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, #855 Xingye Avenue, Guangzhou 511400, China
| | - Yong-Jun Huang
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, #855 Xingye Avenue, Guangzhou 511400, China
| | - Jing Lin
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, #855 Xingye Avenue, Guangzhou 511400, China
| | - Wei-Min Chen
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, #855 Xingye Avenue, Guangzhou 511400, China
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9
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Ballante F, Turkina MV, Ntzouni M, Magnusson KE, Vikström E. Modified N-acyl-L-homoserine lactone compounds abrogate Las-dependent quorum-sensing response in human pathogen Pseudomonas aeruginosa. Front Mol Biosci 2023; 10:1264773. [PMID: 37908228 PMCID: PMC10613653 DOI: 10.3389/fmolb.2023.1264773] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 09/25/2023] [Indexed: 11/02/2023] Open
Abstract
Quorum sensing (QS) is a mode of cell-cell communication that bacteria use to sense population density and orchestrate collective behaviors. The common opportunistic human pathogen Pseudomonas aeruginosa employs QS to regulate a large set of genes involved in virulence and host-pathogen interactions. The Las circuit positioned on the top of the QS hierarchy in P. aeruginosa makes use of N-acyl-L-homoserine lactones (AHLs) as signal molecules, like N-3-oxo-dodecanoyl-L-homoserine lactone (3O-C12-HSL). Disabling QS circuits by certain small-molecule compounds, known as quorum-sensing inhibitors (QSIs), has been proposed as a strategy to attenuate bacterial pathogenicity. In this study, four new AHL analogs were designed by incorporating a tert-butoxycarbonyl Boc group in amide and β-keto (3-oxo) moiety. Compounds were evaluated on a molecular and phenotypic basis as a QSI using the screening strategy linked to the assignment of the Las QS system in P. aeruginosa. Using a LasR-based bioreporter, we found that the compounds decreased LasR-controlled light activity and competed efficiently with natural 3O-C12-HSL. The compounds reduced the production of the cognate 3O-C12-HSL and certain virulence traits, like total protease activity, elastase activity, pyocyanin production, and extracellular DNA release. Furthermore, a quantitative proteomic approach was used to study the effect of the compounds on QS-regulated extracellular proteins. Among the four compounds tested, one of them showed the most significant difference in the appearance of the 3O-C12-HSL-responsive reference proteins related to QS communication and virulence, i.e., a distinct activity as a QSI. Moreover, by combining experimental data with computational chemistry, we addressed the effect of LasR protein flexibility on docking precision and assessed the advantage of using a multi-conformational docking procedure for binding mode prediction of LasR modulators. Thus, the four new AHL compounds were tested for their interaction with the AHL-binding site in LasR to identify the key interferences with the activity of LasR. Our study provides further insight into molecular features that are required for small-molecule modulation of LasR-dependent QS communication in P. aeruginosa. This should facilitate rational design of the next generation of antivirulence tools to study and manipulate QS-controlled fitness in bacteria and, thereby, handle bacterial infections in a new way.
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Affiliation(s)
- Flavio Ballante
- Chemical Biology Consortium Sweden (CBCS), Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Maria V. Turkina
- Department of Biomedical and Clinical Sciences, Faculty of Medicine and Health Sciences, Linköping University, Linköping, Sweden
| | - Maria Ntzouni
- Core Facility, Faculty of Medicine and Health Sciences, Linköping University, Linköping, Sweden
| | - Karl-Eric Magnusson
- Department of Biomedical and Clinical Sciences, Faculty of Medicine and Health Sciences, Linköping University, Linköping, Sweden
| | - Elena Vikström
- Department of Biomedical and Clinical Sciences, Faculty of Medicine and Health Sciences, Linköping University, Linköping, Sweden
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10
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Sathe N, Beech P, Croft L, Suphioglu C, Kapat A, Athan E. Pseudomonas aeruginosa: Infections and novel approaches to treatment "Knowing the enemy" the threat of Pseudomonas aeruginosa and exploring novel approaches to treatment. INFECTIOUS MEDICINE 2023; 2:178-194. [PMID: 38073886 PMCID: PMC10699684 DOI: 10.1016/j.imj.2023.05.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 04/30/2023] [Accepted: 05/05/2023] [Indexed: 03/09/2024]
Abstract
Pseudomonas aeruginosa is an aerobic Gram-negative rod-shaped bacterium with a comparatively large genome and an impressive genetic capability allowing it to grow in a variety of environments and tolerate a wide range of physical conditions. This biological flexibility enables the P. aeruginosa to cause a broad range of infections in patients with serious underlying medical conditions, and to be a principal cause of health care associated infection worldwide. The clinical manifestations of P. aeruginosa include mostly health care associated infections and community-acquired infections. P. aeruginosa possesses an array of virulence factors that counteract host defence mechanisms. It can directly damage host tissue while utilizing high levels of intrinsic and acquired antimicrobial resistance mechanisms to counter most classes of antibiotics. P. aeruginosa co-regulates multiple resistance mechanisms by perpetually moving targets poses a significant therapeutic challenge. Thus, there is an urgent need for novel approaches in the development of anti-Pseudomonas agents. Here we review the principal infections caused by P. aeruginosa and we discuss novel therapeutic options to tackle antibiotic resistance and treatment of P. aeruginosa infections that may be further developed for clinical practice.
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Affiliation(s)
- Nikhil Sathe
- Reliance Life Sciences Pvt. Ltd., Dhirubhai Ambani Life Sciences Centre, Thane Belapur Road, Rabale, Navi Mumbai 400701, India
- School of Life and Environmental Sciences, Deakin University, Melbourne Burwood Campus, 221 Burwood Highway, Burwood Victoria 3125, Australia
| | - Peter Beech
- School of Life and Environmental Sciences, Deakin University, Melbourne Burwood Campus, 221 Burwood Highway, Burwood Victoria 3125, Australia
| | - Larry Croft
- School of Life and Environmental Sciences, Deakin University, Melbourne Burwood Campus, 221 Burwood Highway, Burwood Victoria 3125, Australia
| | - Cenk Suphioglu
- NeuroAllergy Research Laboratory, School of Life and Environmental Sciences, Deakin University, Geelong Campus at Waurn Ponds, 75 Pigdons Road, Waurn Ponds Victoria 3216, Australia
| | - Arnab Kapat
- Reliance Life Sciences Pvt. Ltd., Dhirubhai Ambani Life Sciences Centre, Thane Belapur Road, Rabale, Navi Mumbai 400701, India
| | - Eugene Athan
- School of Medicine, Deakin University, PO Box 281 Geelong 3220, Australia
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11
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Styles MJ, Boursier ME, McEwan MA, Santa EE, Mattmann ME, Slinger BL, Blackwell HE. Autoinducer-fluorophore conjugates enable FRET in LuxR proteins in vitro and in cells. Nat Chem Biol 2022; 18:1115-1124. [PMID: 35927585 PMCID: PMC9529866 DOI: 10.1038/s41589-022-01089-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 06/21/2022] [Indexed: 11/09/2022]
Abstract
Cell-to-cell signaling, or quorum sensing (QS), in many Gram-negative bacteria is governed by small molecule signals (N-acyl-L-homoserine lactones, AHLs) and their cognate receptors (LuxR-type proteins). The mechanistic underpinnings of QS in these bacteria are severely limited due to the challenges of isolating and manipulating most LuxR-type proteins. Reports of quantitative direct-binding experiments on LuxR-type proteins are scarce, and robust and generalizable methods that provide such data are largely nonexistent. We report herein a Förster resonance energy transfer (FRET) assay that leverages (1) conserved tryptophans located in the LuxR-type protein ligand-binding site and synthetic fluorophore-AHL conjugates, and (2) isolation of the proteins bound to weak agonists. The FRET assay permits straightforward measurement of ligand-binding affinities with receptor-either in vitro or in cells-and was shown to be compatible with six LuxR-type proteins. These methods will advance fundamental investigations of LuxR-type protein mechanism and the development of small molecule QS modulators.
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Affiliation(s)
- Matthew J Styles
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | | | | | - Emma E Santa
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | | | - Betty L Slinger
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Helen E Blackwell
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA.
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12
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Beenker WAG, Hoeksma J, den Hertog J. Gregatins, a Group of Related Fungal Secondary Metabolites, Inhibit Aspects of Quorum Sensing in Gram-Negative Bacteria. Front Microbiol 2022; 13:934235. [PMID: 35865924 PMCID: PMC9296082 DOI: 10.3389/fmicb.2022.934235] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 06/02/2022] [Indexed: 12/11/2022] Open
Abstract
Quorum sensing (QS) is a process that regulates gene expression based on cell density. In bacteria, QS facilitates collaboration and controls a large number of pathways, including biofilm formation and virulence factor production, which lead to lower sensitivity to antibiotics and higher toxicity in the host, respectively. Inhibition of QS is a promising strategy to combat bacterial infections. In this study, we tested the potential of secondary metabolites from fungi to inhibit bacterial QS using a library derived from more than ten thousand different fungal strains. We used the reporter bacterium, Chromobacterium violaceum, and identified 39 fungal strains that produced QS inhibitor activity. These strains expressed two QS inhibitors that had been described before and eight QS inhibitors that had not been described before. Further testing for QS inhibitor activity against the opportunistic pathogen Pseudomonas aeruginosa led to the identification of gregatins as an interesting family of compounds with QS inhibitor activity. Although various gregatins inhibited QS in P. aeruginosa, these gregatins did not inhibit virulence factor production and biofilm formation. We conclude that gregatins inhibit some, but not all aspects of QS.
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Affiliation(s)
- Wouter A. G. Beenker
- Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, Netherlands
| | - Jelmer Hoeksma
- Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, Netherlands
| | - Jeroen den Hertog
- Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, Netherlands
- Institute Biology Leiden, Leiden University, Leiden, Netherlands
- *Correspondence: Jeroen den Hertog
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13
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The Xanthophyll Carotenoid Lutein Reduces the Invasive Potential of Pseudomonas aeruginosa and Increases Its Susceptibility to Tobramycin. Int J Mol Sci 2022; 23:ijms23137199. [PMID: 35806201 PMCID: PMC9266958 DOI: 10.3390/ijms23137199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Revised: 06/24/2022] [Accepted: 06/27/2022] [Indexed: 11/16/2022] Open
Abstract
Recently, the xanthophyll carotenoid lutein has been qualified as a potential quorum sensing (QS) and biofilm inhibitor against Pseudomonas aeruginosa. To address the potential of this xanthophyll compound as a relevant antivirulence agent, we investigated in depth its impact on the invasion capabilities and aggressiveness of P. aeruginosa PAO1, which rely on the bacterial ability to build and maintain protective barriers, use different types of motilities and release myriad virulence factors, leading to host cell and tissue damages. Our data, obtained on the PAO1 strain, indicate that all-trans lutein (Lut; 22 µM) disrupts biofilm formation and disorganizes established biofilm structure without affecting bacterial viability, while improving the bactericidal activity of tobramycin against biofilm-encapsulated PAO1 cells. Furthermore, this xanthophyll affects PAO1 twitching and swarming motilities while reducing the production of the extracellular virulence factors pyocyanin, elastase and rhamnolipids as well as the expression of the QS-regulated lasB and rhlA genes without inhibiting the QS-independent aceA gene. Interestingly, the expression of the QS regulators rhlR/I and lasR/I is significantly reduced as well as that of the global virulence factor regulator vfr, which is suggested to be a major target of Lut. Finally, an oxidative metabolite of Lut, 3′-dehydrolutein, induces a similar inhibition phenotype. Taken together, lutein-type compounds represent potential agents to control the invasive ability and antibiotic resistance of P. aeruginosa.
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14
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Tuon FF, Dantas LR, Suss PH, Tasca Ribeiro VS. Pathogenesis of the Pseudomonas aeruginosa Biofilm: A Review. Pathogens 2022; 11:pathogens11030300. [PMID: 35335624 PMCID: PMC8950561 DOI: 10.3390/pathogens11030300] [Citation(s) in RCA: 108] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/08/2022] [Accepted: 02/24/2022] [Indexed: 01/21/2023] Open
Abstract
Pseudomonas aeruginosa is associated with several human infections, mainly related to healthcare services. In the hospital, it is associated with resistance to several antibiotics, which poses a great challenge to therapy. However, one of the biggest challenges in treating P. aeruginosa infections is that related to biofilms. The complex structure of the P. aeruginosa biofilm contributes an additional factor to the pathogenicity of this microorganism, leading to therapeutic failure, in addition to escape from the immune system, and generating chronic infections that are difficult to eradicate. In this review, we address several molecular aspects of the pathogenicity of P. aeruginosa biofilms.
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15
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Bhukta S, Samal SK, Vasudevan S, Sarveswari HB, Shanmugam K, Princy SA, Dandela R. A Prospective Diversity of Antibacterial Small Peptidomimetic and Quorum Sensing Mediated Drug: A Review. ChemistrySelect 2022. [DOI: 10.1002/slct.202102743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Swadhapriya Bhukta
- Institute of Chemical Technology-Indian Oil Odisha Campus Department of Industrial and Engineering Chemistry Bhubaneswar 751013 Odisha India
| | - Sangram Keshari Samal
- Laboratory of Biomaterials and Regenerative Medicine for Advanced Therapies Indian Council of Medical Research-Regional Medical Research Center Bhubaneswar 751013 Odisha India
| | - Sahana Vasudevan
- Quorum Sensing Laboratory Centre for Research in Infectious Diseases (CRID) School of Chemical and Biotechnology SASTRA University Thanjavur 613401 Tamil Nadu India
| | - Hema Bhagavathi Sarveswari
- Quorum Sensing Laboratory Centre for Research in Infectious Diseases (CRID) School of Chemical and Biotechnology SASTRA University Thanjavur 613401 Tamil Nadu India
| | - Karthi Shanmugam
- Quorum Sensing Laboratory Centre for Research in Infectious Diseases (CRID) School of Chemical and Biotechnology SASTRA University Thanjavur 613401 Tamil Nadu India
| | - S. Adline Princy
- Quorum Sensing Laboratory Centre for Research in Infectious Diseases (CRID) School of Chemical and Biotechnology SASTRA University Thanjavur 613401 Tamil Nadu India
| | - Rambabu Dandela
- Institute of Chemical Technology-Indian Oil Odisha Campus Department of Industrial and Engineering Chemistry Bhubaneswar 751013 Odisha India
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16
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Miranda SW, Asfahl KL, Dandekar AA, Greenberg EP. Pseudomonas aeruginosa Quorum Sensing. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1386:95-115. [PMID: 36258070 PMCID: PMC9942581 DOI: 10.1007/978-3-031-08491-1_4] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Pseudomonas aeruginosa, like many bacteria, uses chemical signals to communicate between cells in a process called quorum sensing (QS). QS allows groups of bacteria to sense population density and, in response to changing cell densities, to coordinate behaviors. The P. aeruginosa QS system consists of two complete circuits that involve acyl-homoserine lactone signals and a third system that uses quinolone signals. Together, these three QS circuits regulate the expression of hundreds of genes, many of which code for virulence factors. P. aeruginosa has become a model for studying the molecular biology of QS and the ecology and evolution of group behaviors in bacteria. In this chapter, we recount the history of discovery of QS systems in P. aeruginosa, discuss how QS relates to virulence and the ecology of this bacterium, and explore strategies to inhibit QS. Finally, we discuss future directions for research in P. aeruginosa QS.
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Affiliation(s)
| | - Kyle L Asfahl
- Department of Microbiology, University of Washington School of Medicine, Seattle, WA, USA
| | - Ajai A Dandekar
- Department of Microbiology, University of Washington School of Medicine, Seattle, WA, USA
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | - E P Greenberg
- Department of Microbiology, University of Washington School of Medicine, Seattle, WA, USA.
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17
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Ahmed M, SaKai Y, Fukudome M, Yuan DQ. Cucurbit[7]uril: Synthesis and quenching the quorum sensing in bacteria. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Polaske TJ, Gahan CG, Nyffeler KE, Lynn DM, Blackwell HE. Identification of small molecules that strongly inhibit bacterial quorum sensing using a high-throughput lipid vesicle lysis assay. Cell Chem Biol 2021; 29:605-614.e4. [PMID: 34932995 PMCID: PMC9035047 DOI: 10.1016/j.chembiol.2021.12.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 09/27/2021] [Accepted: 11/29/2021] [Indexed: 01/15/2023]
Abstract
Strategies to both monitor and block bacterial quorum sensing (QS), and thus associated infections, are of significant interest. We developed a straightforward assay to monitor biosurfactants and lytic agents produced by bacteria under the control of QS. The method is based on the lysis of synthetic lipid vesicles containing the environmentally sensitive fluorescent dye calcein. This assay allows for the in situ screening of compounds capable of altering biosurfactant production by bacteria, and thereby the identification of molecules that could potentially modulate QS pathways, and avoids the constraints of many of the cell-based assays in use today. Application of this assay in a high-throughput format revealed five molecules capable of blocking vesicle lysis by S. aureus. Two of these compounds were found to almost completely inhibit agr-based QS in S. aureus and represent the most potent small-molecule-derived QS inhibitors reported in this formidable pathogen.
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Affiliation(s)
- Thomas J Polaske
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI 53706, USA
| | - Curran G Gahan
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706, USA
| | - Kayleigh E Nyffeler
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI 53706, USA; Microbiology Doctoral Training Program, University of Wisconsin-Madison, 1550 Linden Dr., Madison, WI 53706, USA
| | - David M Lynn
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI 53706, USA; Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706, USA.
| | - Helen E Blackwell
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI 53706, USA.
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19
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Ampomah-Wireko M, Luo C, Cao Y, Wang H, Nininahazwe L, Wu C. Chemical probe of AHL modulators on quorum sensing in Gram-Negative Bacteria and as antiproliferative agents: A review. Eur J Med Chem 2021; 226:113864. [PMID: 34626877 DOI: 10.1016/j.ejmech.2021.113864] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 09/17/2021] [Accepted: 09/19/2021] [Indexed: 11/16/2022]
Abstract
Pathogenic bacteria use an intercellular chemical communication system called quorum sensing (QS) to control the expression of cellular functions such as virulence factors, biofilm formation, toxin production, and antibiotic resistance in a manner that is highly dependent on population density. Hence, since the emergence of QS, there has been a great interest in exploiting the QS mechanism as a new drug target. Therefore, blocking the QS mechanism can be an effective strategy to control infection and solve the problem of drug resistance. So far, there is no clinically approved anti-QS drug that can disable the circuits of QS systems. This review discusses the quorum-sensing network systems and novel anti-QS inhibitors in some Gram-negative bacteria.
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Affiliation(s)
- Maxwell Ampomah-Wireko
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, PR China; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education & School of Pharmaceutical Sciences, Zhengzhou, 450001, PR China; Zhengzhou Key Laboratory of New Veterinary Drug Preparation Innovation, Zhengzhou, 450001, PR China
| | - Chunying Luo
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, PR China; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education & School of Pharmaceutical Sciences, Zhengzhou, 450001, PR China; Zhengzhou Key Laboratory of New Veterinary Drug Preparation Innovation, Zhengzhou, 450001, PR China
| | - Yaquan Cao
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, PR China; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education & School of Pharmaceutical Sciences, Zhengzhou, 450001, PR China; Zhengzhou Key Laboratory of New Veterinary Drug Preparation Innovation, Zhengzhou, 450001, PR China
| | - Huanhuan Wang
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, PR China; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education & School of Pharmaceutical Sciences, Zhengzhou, 450001, PR China; Zhengzhou Key Laboratory of New Veterinary Drug Preparation Innovation, Zhengzhou, 450001, PR China
| | - Lauraine Nininahazwe
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, PR China; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education & School of Pharmaceutical Sciences, Zhengzhou, 450001, PR China; Zhengzhou Key Laboratory of New Veterinary Drug Preparation Innovation, Zhengzhou, 450001, PR China
| | - Chunli Wu
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, PR China; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education & School of Pharmaceutical Sciences, Zhengzhou, 450001, PR China; Zhengzhou Key Laboratory of New Veterinary Drug Preparation Innovation, Zhengzhou, 450001, PR China.
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20
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Duplantier M, Lohou E, Sonnet P. Quorum Sensing Inhibitors to Quench P. aeruginosa Pathogenicity. Pharmaceuticals (Basel) 2021; 14:1262. [PMID: 34959667 PMCID: PMC8707152 DOI: 10.3390/ph14121262] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/01/2021] [Accepted: 12/02/2021] [Indexed: 12/22/2022] Open
Abstract
The emergence and the dissemination of multidrug-resistant bacteria constitute a major public health issue. Among incriminated Gram-negative bacteria, Pseudomonas aeruginosa has been designated by the WHO as a critical priority threat. During the infection process, this pathogen secretes various virulence factors in order to adhere and colonize host tissues. Furthermore, P. aeruginosa has the capacity to establish biofilms that reinforce its virulence and intrinsic drug resistance. The regulation of biofilm and virulence factor production of this micro-organism is controlled by a specific bacterial communication system named Quorum Sensing (QS). The development of anti-virulence agents targeting QS that could attenuate P. aeruginosa pathogenicity without affecting its growth seems to be a promising new therapeutic strategy. This could prevent the selective pressure put on bacteria by the conventional antibiotics that cause their death and promote resistant strain survival. This review describes the QS-controlled pathogenicity of P. aeruginosa and its different specific QS molecular pathways, as well as the recent advances in the development of innovative QS-quenching anti-virulence agents to fight anti-bioresistance.
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Affiliation(s)
| | | | - Pascal Sonnet
- AGIR, UR4294, UFR of Pharmacy, Jules Verne University of Picardie, 80037 Amiens, France; (M.D.); (E.L.)
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21
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Babushkina IV, Mamonova IА, Ulyanov VY, Gladkova ЕV, Shpinyak SP. Resistance to Antibiotics in Plankton and Biofilm Cultures of Pseudomonas aeruginosa Clinical Strains. Bull Exp Biol Med 2021; 172:155-157. [PMID: 34853964 DOI: 10.1007/s10517-021-05354-6] [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: 05/18/2021] [Indexed: 11/29/2022]
Abstract
Biofilms formed by Pseudomonas aeruginosa strains isolated from biomaterial of patients with implant-associated infection are characterized by much higher resistance to antibiotics of various classes than plankton cultures of these strains. The concentrations of antibiotics causing the death of 90% of P. aeruginosa biofilm (MIC90) was 2-6 μg/ml for fluoroquinolones, 267-356 μg/ml for cephalosporins, and 92-215 μg/ml for amikacin, which significantly (p<0.05) differed from MIC90 for plankton cultures that did not exceed 0.8 μg/ml for fluoroquinolones, 19 μg/ml for cephalosporins, and 3 μg/ml for amikacin. The degree of the microbial biofilm maturity also affected antibiotic resistance.
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Affiliation(s)
- I V Babushkina
- Research Institute of Traumatology, Orthopedics and Neurosurgery, V. I. Razumovsky Saratov State Medical University, Ministry of Health of the Russian Federation, Saratov, Russia.
| | - I А Mamonova
- Research Institute of Traumatology, Orthopedics and Neurosurgery, V. I. Razumovsky Saratov State Medical University, Ministry of Health of the Russian Federation, Saratov, Russia
| | - V Yu Ulyanov
- Research Institute of Traumatology, Orthopedics and Neurosurgery, V. I. Razumovsky Saratov State Medical University, Ministry of Health of the Russian Federation, Saratov, Russia
| | - Е V Gladkova
- Research Institute of Traumatology, Orthopedics and Neurosurgery, V. I. Razumovsky Saratov State Medical University, Ministry of Health of the Russian Federation, Saratov, Russia
| | - S P Shpinyak
- Research Institute of Traumatology, Orthopedics and Neurosurgery, V. I. Razumovsky Saratov State Medical University, Ministry of Health of the Russian Federation, Saratov, Russia
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22
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Ruiz CH, Osorio-Llanes E, Trespalacios MH, Mendoza-Torres E, Rosales W, Gómez CMM. Quorum Sensing Regulation as a Target for Antimicrobial Therapy. Mini Rev Med Chem 2021; 22:848-864. [PMID: 34856897 DOI: 10.2174/1389557521666211202115259] [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: 10/04/2020] [Revised: 05/20/2021] [Accepted: 09/04/2021] [Indexed: 11/22/2022]
Abstract
Some bacterial species use a cell-to-cell communication mechanism called Quorum Sensing (QS). Bacteria release small diffusible molecules, usually termed signals which allow the activation of beneficial phenotypes that guarantee bacterial survival and the expression of a diversity of virulence genes in response to an increase in population density. The study of the molecular mechanisms that relate signal molecules with bacterial pathogenesis is an area of growing interest due to its use as a possible therapeutic alternative through the development of synthetic analogues of autoinducers as a strategy to regulate bacterial communication as well as the study of bacterial resistance phenomena, the study of these relationships is based on the structural diversity of natural or synthetic autoinducers and their ability to inhibit bacterial QS, which can be approached with a molecular perspective from the following topics: i) Molecular signals and their role in QS regulation; ii) Strategies in the modulation of Quorum Sensing; iii) Analysis of Bacterial QS circuit regulation strategies; iv) Structural evolution of natural and synthetic autoinducers as QS regulators. This mini-review allows a molecular view of the QS systems, showing a perspective on the importance of the molecular diversity of autoinducer analogs as a strategy for the design of new antimicrobial agents.
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Affiliation(s)
- Caterine Henríquez Ruiz
- Grupo de Investigación en Química Orgánica y Biomédica. Faculty of Basic Sciences. Universidad del Atlántico. Barranquilla. Colombia
| | - Estefanie Osorio-Llanes
- Faculty of Exact and Natural sciences. Grupo de Investigación Avanzada en Biomedicina. Universidad Libre. Barranquilla. Colombia
| | - Mayra Hernández Trespalacios
- Grupo de Investigación en Química Orgánica y Biomédica. Faculty of Basic Sciences. Universidad del Atlántico. Barranquilla. Colombia
| | - Evelyn Mendoza-Torres
- Faculty of Health Sciences. Grupo de Investigación Avanzada en Biomedicina-Universidad Libre. Barranquilla. Colombia
| | - Wendy Rosales
- Faculty of Exact and Natural sciences. Grupo de Investigación Avanzada en Biomedicina. Universidad Libre. Barranquilla. Colombia
| | - Carlos Mario Meléndez Gómez
- Grupo de Investigación en Química Orgánica y Biomédica. Faculty of Basic Sciences. Universidad del Atlántico. Barranquilla. Colombia
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23
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Froes TQ, Chaves BT, Mendes MS, Ximenes RM, da Silva IM, da Silva PBG, de Albuquerque JFC, Castilho MS. Synthesis and biological evaluation of thiazolidinedione derivatives with high ligand efficiency to P. aeruginosa PhzS. J Enzyme Inhib Med Chem 2021; 36:1217-1229. [PMID: 34080514 PMCID: PMC8186431 DOI: 10.1080/14756366.2021.1931165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 04/29/2021] [Accepted: 05/11/2021] [Indexed: 01/07/2023] Open
Abstract
The thiazolidinone ring is found in compounds that have widespan biology activity and there is mechanism-based evidence that compounds bearing this moiety inhibit P. aeruginosa PhzS (PaPzhS), a key enzyme in the biosynthesis of the virulence factor named pyocyanin. Ten novel thiazolidinone derivatives were synthesised and screened against PaPhzS, using two orthogonal assays. The biological results provided by these and 28 other compounds, whose synthesis had been described, suggest that the dihydroquinazoline ring, found in the previous hit (A- Kd = 18 µM and LE = 0.20), is not required for PaPzhS inhibition, but unsubstituted nitrogen at the thiazolidinone ring is. The molecular simplification approach, pursued in this work, afforded an optimised lead compound (13- 5-(2,4-dimethoxyphenyl)thiazolidine-2,4-dione) with 10-fold improvement in affinity (Kd= 1.68 µM) and more than 100% increase in LE (0.45), which follows the same inhibition mode as the original hit compound (competitive to NADH).Executive summaryPhzS is a key enzyme in the pyocyanin biosynthesis pathway in P. aeruginosa.Orthogonal assays (TSA and FITC) show that fragment-like thiazolidinedione derivatives bind to PaPhzS with one-digit micromolar affinity.Fragment-like thiazolidinedione derivatives bind to the cofactor (NADH) binding site in PaPhzS.The molecular simplification optimised the ligand efficiency and affinity of the lead compound.
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Affiliation(s)
- Thamires Quadros Froes
- Programa de Pós-graduação em biotecnologia da, Universidade Estadual de Feira de Santana, Feira de Santana, Brazil
| | | | - Marina Sena Mendes
- Faculdade de Farmácia da, Universidade Federal da Bahia, Salvador, Brazil
| | - Rafael Matos Ximenes
- Departamento de Antibióticos da, Universidade Federal de Pernambuco. Av. Prof. Moraes Rego, Recife-Pe, Brazil
| | - Ivanildo Mangueira da Silva
- Departamento de Antibióticos da, Universidade Federal de Pernambuco. Av. Prof. Moraes Rego, Recife-Pe, Brazil
| | | | | | - Marcelo Santos Castilho
- Programa de Pós-graduação em biotecnologia da, Universidade Estadual de Feira de Santana, Feira de Santana, Brazil
- Faculdade de Farmácia da, Universidade Federal da Bahia, Salvador, Brazil
- Programa de Pós-Graduação em Farmácia da, Universidade Federal da Bahia, Salvador, Brazil
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Abd El-Aleam RH, George RF, Georgey HH, Abdel-Rahman HM. Bacterial virulence factors: a target for heterocyclic compounds to combat bacterial resistance. RSC Adv 2021; 11:36459-36482. [PMID: 35494393 PMCID: PMC9043591 DOI: 10.1039/d1ra06238g] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 11/01/2021] [Indexed: 12/17/2022] Open
Abstract
Antibiotic resistance is one of the most important challenges of the 21st century. However, the growing understanding of bacterial pathogenesis and cell-to-cell communication has revealed many potential strategies for the discovery of drugs that can be used for the treatment of bacterial infections. Interfering with bacterial virulence and/or quorum sensing could be a particularly interesting approach, because it is believed to exert less selective pressure on the bacterial resistance than with traditional strategies, geared toward killing bacteria or preventing their growth. Here, we discuss the mechanism of bacterial virulence, presenting promising strategies and recently synthesized heterocyclic compounds to combat future bacterial infections.
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Affiliation(s)
- Rehab H Abd El-Aleam
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Modern University for Technology and Information MTI Cairo 11571 Egypt
| | - Riham F George
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Cairo University Cairo 11562 Egypt
| | - Hanan H Georgey
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Cairo University Cairo 11562 Egypt
- Pharmaceutical Chemistry Department, Faculty of Pharmacy and Drug Technology, Egyptian Chinese University Cairo 11786 Egypt
| | - Hamdy M Abdel-Rahman
- Medicinal Chemistry Department, Faculty of Pharmacy, Assiut University Assiut 71526 Egypt
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Nahda University Beni Suef Egypt
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25
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Union is strength: target-based and whole-cell high throughput screens in antibacterial discovery. J Bacteriol 2021; 204:e0047721. [PMID: 34723646 DOI: 10.1128/jb.00477-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Antimicrobial resistance is one of the greatest global health challenges today. For over three decades antibacterial discovery research and development has been focused on cell-based and target-based high throughput assays. Target-based screens use diagnostic enzymatic reactions to look for molecules that can bind directly and inhibit the target. Target-based screens are only applied to proteins that can be successfully expressed, purified and the activity of which can be effectively measured using a biochemical assay. Often times the molecules found in these in vitro screens are not active in cells due to poor permeability or efflux. On the other hand, cell-based screens use whole cells and look for growth inhibition. These screens give higher number of hits than target-based assays and can simultaneously test many targets of one process or pathway in their physiological context. Both strategies have pros and cons when used separately. In the past decade and a half our increasing knowledge of bacterial physiology has led to the development of innovative and sophisticated technologies to perform high throughput screening combining these two strategies and thus minimizing their disadvantages. In this review we discuss recent examples of high throughput approaches that used both target-based and whole-cell screening to find new antibacterials, the new insights they have provided and how this knowledge can be applied to other in vivo validated targets to develop new antimicrobials.
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Falcarindiol Isolated from Notopterygium incisum Inhibits the Quorum Sensing of Pseudomonas aeruginosa. Molecules 2021; 26:molecules26195896. [PMID: 34641440 PMCID: PMC8512080 DOI: 10.3390/molecules26195896] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 09/14/2021] [Accepted: 09/20/2021] [Indexed: 11/23/2022] Open
Abstract
Quorum sensing (QS) is employed by the opportunistic pathogen Pseudomonas aeruginosa to regulate physiological behaviors and virulence. QS inhibitors (QSIs) are potential anti-virulence agents for the therapy of P. aeruginosa infection. During the screening for QSIs from Chinese herbal medicines, falcarindiol (the major constituent of Notopterygium incisum) exhibited QS inhibitory activity. The subinhibitory concentration of falcarindiol exerted significant inhibitory effects on the formation of biofilm and the production of virulence factors such as elastase, pyocyanin, and rhamnolipid. The mRNA expression of QS-related genes (lasB, phzH, rhlA, lasI, rhlI, pqsA, and rhlR) was downregulated by falcarindiol while that of lasR was not affected by falcarindiol. The transcriptional activation of the lasI promoter was inhibited by falcarindiol in the P. aeruginosa QSIS-lasI selector. Further experiments confirmed that falcarindiol inhibited the las system using the reporter strain Escherichia coli MG4/pKDT17. Electrophoretic mobility shift assay (EMSA) showed that falcarindiol inhibited the binding of the transcription factor LasR and the lasI promoter region. Molecular docking showed that falcarindiol interacted with the Tyr47 residue, leading to LasR instability. The decrease of LasR-mediated transcriptional activation was responsible for the reduction of downstream gene expression, which further inhibited virulence production. The inhibition mechanism of falcarindiol to LasR provides a theoretical basis for its medicinal application.
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Singh S, Bhatia S. Quorum Sensing Inhibitors: Curbing Pathogenic Infections through Inhibition of Bacterial Communication. IRANIAN JOURNAL OF PHARMACEUTICAL RESEARCH : IJPR 2021; 20:486-514. [PMID: 34567177 PMCID: PMC8457738 DOI: 10.22037/ijpr.2020.113470.14318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Currently, most of the developed and developing countries are facing the problem of infectious diseases. The genius way of an exaggerated application of antibiotics led the infectious agents to respond by bringing a regime of persisters to resist antibiotics attacks prolonging their survival. Persisters have the dexterity to communicate among themself using signal molecules via the process of Quorum Sensing (QS), which regulates virulence gene expression and biofilms formation, making them more vulnerable to antibiotic attack. Our review aims at the different approaches applied in the ordeal to solve the riddle for QS inhibitors. QS inhibitors, their origin, structures and key interactions for QS inhibitory activity have been summarized. Solicitation of a potent QS inhibitor molecule would be beneficial, giving new life to the simplest antibiotics in adjuvant therapy.
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Affiliation(s)
- Shaminder Singh
- Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3 Milestone, Faridabad-Gurugram Expressway, Faridabad - 121 001, Haryana, India
| | - Sonam Bhatia
- Department of Pharmaceutical Science, SHALOM Institute of Health and Allied Sciences, Sam Higginbottom University of Agriculture, Technology and Sciences (SHUATS), Naini-211007, Prayagraj, Uttar Pradesh, India
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Zhang Q, Li S, Queneau Y, Soulère L. Synthesis of new 1,4‐ and 1,5‐disubstituted
N
‐ethyl acetate and
N
‐α‐butyro‐γ‐lactone alkylimidazole derivatives as
N
‐acylhomoserine lactone analogs. J Heterocycl Chem 2021. [DOI: 10.1002/jhet.4356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Qiang Zhang
- Univ Lyon, INSA Lyon Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires Villeurbanne France
| | - Si‐Zhe Li
- Univ Lyon, INSA Lyon Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires Villeurbanne France
| | - Yves Queneau
- Univ Lyon, INSA Lyon Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires Villeurbanne France
| | - Laurent Soulère
- Univ Lyon, INSA Lyon Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires Villeurbanne France
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29
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Zhang Q, Li S, Hachicha M, Boukraa M, Soulère L, Efrit ML, Queneau Y. Heterocyclic Chemistry Applied to the Design of N-Acyl Homoserine Lactone Analogues as Bacterial Quorum Sensing Signals Mimics. Molecules 2021; 26:molecules26175135. [PMID: 34500565 PMCID: PMC8433848 DOI: 10.3390/molecules26175135] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 07/30/2021] [Accepted: 07/31/2021] [Indexed: 12/02/2022] Open
Abstract
N-acyl homoserine lactones (AHLs) are small signaling molecules used by many Gram-negative bacteria for coordinating their behavior as a function of their population density. This process, based on the biosynthesis and the sensing of such molecular signals, and referred to as Quorum Sensing (QS), regulates various gene expressions, including growth, virulence, biofilms formation, and toxin production. Considering the role of QS in bacterial pathogenicity, its modulation appears as a possible complementary approach in antibacterial strategies. Analogues and mimics of AHLs are therefore biologically relevant targets, including several families in which heterocyclic chemistry provides a strategic contribution in the molecular design and the synthetic approach. AHLs consist of three main sections, the homoserine lactone ring, the central amide group, and the side chain, which can vary in length and level of oxygenation. The purpose of this review is to summarize the contribution of heterocyclic chemistry in the design of AHLs analogues, insisting on the way heterocyclic building blocks can serve as replacements of the lactone moiety, as a bioisostere for the amide group, or as an additional pattern appended to the side chain. A few non-AHL-related heterocyclic compounds with AHL-like QS activity are also mentioned.
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Affiliation(s)
- Qiang Zhang
- Univ Lyon, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, Bât. E. Lederer, 1 Rue Victor Grignard, F-69622 Villeurbanne, France; (Q.Z.); (S.L.); (M.H.); (M.B.)
| | - Sizhe Li
- Univ Lyon, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, Bât. E. Lederer, 1 Rue Victor Grignard, F-69622 Villeurbanne, France; (Q.Z.); (S.L.); (M.H.); (M.B.)
| | - Maha Hachicha
- Univ Lyon, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, Bât. E. Lederer, 1 Rue Victor Grignard, F-69622 Villeurbanne, France; (Q.Z.); (S.L.); (M.H.); (M.B.)
- Laboratoire de Synthèse Organique Sélective et Hétérocyclique, Faculté des Sciences de Tunis, Université de Tunis El Manar, El Manar, Tunis 2092, Tunisia
| | - Mohamed Boukraa
- Univ Lyon, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, Bât. E. Lederer, 1 Rue Victor Grignard, F-69622 Villeurbanne, France; (Q.Z.); (S.L.); (M.H.); (M.B.)
- Laboratoire de Synthèse Organique Sélective et Hétérocyclique, Faculté des Sciences de Tunis, Université de Tunis El Manar, El Manar, Tunis 2092, Tunisia
| | - Laurent Soulère
- Univ Lyon, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, Bât. E. Lederer, 1 Rue Victor Grignard, F-69622 Villeurbanne, France; (Q.Z.); (S.L.); (M.H.); (M.B.)
- Correspondence: (L.S.); (M.L.E.); (Y.Q.)
| | - Mohamed L. Efrit
- Laboratoire de Synthèse Organique Sélective et Hétérocyclique, Faculté des Sciences de Tunis, Université de Tunis El Manar, El Manar, Tunis 2092, Tunisia
- Correspondence: (L.S.); (M.L.E.); (Y.Q.)
| | - Yves Queneau
- Univ Lyon, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, UMR 5246, CNRS, ICBMS, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, Bât. E. Lederer, 1 Rue Victor Grignard, F-69622 Villeurbanne, France; (Q.Z.); (S.L.); (M.H.); (M.B.)
- Correspondence: (L.S.); (M.L.E.); (Y.Q.)
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Papa R, Vrenna G, D’Angelo C, Casillo A, Relucenti M, Donfrancesco O, Corsaro MM, Fiscarelli EV, Tuccio Guarna Assanti V, Tutino ML, Parrilli E, Artini M, Selan L. Anti-Virulence Activity of the Cell-Free Supernatant of the Antarctic Bacterium Psychrobacter sp. TAE2020 against Pseudomonas aeruginosa Clinical Isolates from Cystic Fibrosis Patients. Antibiotics (Basel) 2021; 10:944. [PMID: 34438994 PMCID: PMC8388993 DOI: 10.3390/antibiotics10080944] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 07/29/2021] [Accepted: 08/03/2021] [Indexed: 12/20/2022] Open
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen often involved in airway infections of cystic fibrosis (CF) patients. Its pathogenicity is related to several virulence factors, such as biofilm formation, motility and production of toxins and proteases. The expression of these virulence factors is controlled by quorum sensing (QS). Thus, QS inhibition is considered a novel strategy for the development of antipathogenic compounds acting on specific bacterial virulence programs without affecting bacterial vitality. In this context, cold-adapted marine bacteria living in polar regions represent an untapped reservoir of biodiversity endowed with an interesting chemical repertoire. In this paper, we investigated the biological activity of a supernatant derived from a novel Antarctic bacterium (SN_TAE2020) against specific virulence factors produced by P. aeruginosa strains isolated from FC patients. Our results clearly show a reduction in pyocyanin and protease production in the presence of SN_TAE2020. Finally, SN_TAE2020 was also able to strongly affect swarming and swimming motility for almost all tested strains. Furthermore, the effect of SN_TAE2020 was investigated on biofilm growth and texture, captured by SEM analysis. In consideration of the novel results obtained on clinical strains, polar bacteria might represent potential candidates for the discovery of new compounds limiting P. aeruginosa virulence in CF patients.
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Affiliation(s)
- Rosanna Papa
- Department of Public Health and Infectious Diseases, Sapienza University, p.le Aldo Moro 5, 00185 Rome, Italy; (G.V.); (L.S.)
| | - Gianluca Vrenna
- Department of Public Health and Infectious Diseases, Sapienza University, p.le Aldo Moro 5, 00185 Rome, Italy; (G.V.); (L.S.)
| | - Caterina D’Angelo
- Department of Chemical Sciences, Federico II University, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy; (C.D.); (A.C.); (M.M.C.); (M.L.T.); (E.P.)
| | - Angela Casillo
- Department of Chemical Sciences, Federico II University, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy; (C.D.); (A.C.); (M.M.C.); (M.L.T.); (E.P.)
| | - Michela Relucenti
- Department of Anatomy, Histology, Forensic Medicine and Orthopaedics, Sapienza University of Rome, Via Alfonso Borelli 50, 00161 Rome, Italy; (M.R.); (O.D.)
| | - Orlando Donfrancesco
- Department of Anatomy, Histology, Forensic Medicine and Orthopaedics, Sapienza University of Rome, Via Alfonso Borelli 50, 00161 Rome, Italy; (M.R.); (O.D.)
| | - Maria Michela Corsaro
- Department of Chemical Sciences, Federico II University, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy; (C.D.); (A.C.); (M.M.C.); (M.L.T.); (E.P.)
| | - Ersilia Vita Fiscarelli
- Unit Cystic Fibrosis Diagnostic Microbiology and Immunology Diagnostics, Diagnostic Medicine and Laboratory Department, Bambino Gesù Children’s IRCCS Hospital, 00165 Rome, Italy; (E.V.F.); (V.T.G.A.)
| | - Vanessa Tuccio Guarna Assanti
- Unit Cystic Fibrosis Diagnostic Microbiology and Immunology Diagnostics, Diagnostic Medicine and Laboratory Department, Bambino Gesù Children’s IRCCS Hospital, 00165 Rome, Italy; (E.V.F.); (V.T.G.A.)
| | - Maria Luisa Tutino
- Department of Chemical Sciences, Federico II University, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy; (C.D.); (A.C.); (M.M.C.); (M.L.T.); (E.P.)
| | - Ermenegilda Parrilli
- Department of Chemical Sciences, Federico II University, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy; (C.D.); (A.C.); (M.M.C.); (M.L.T.); (E.P.)
| | - Marco Artini
- Department of Public Health and Infectious Diseases, Sapienza University, p.le Aldo Moro 5, 00185 Rome, Italy; (G.V.); (L.S.)
| | - Laura Selan
- Department of Public Health and Infectious Diseases, Sapienza University, p.le Aldo Moro 5, 00185 Rome, Italy; (G.V.); (L.S.)
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31
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Bhardwaj S, Bhatia S, Singh S, Franco Jr F. Growing emergence of drug-resistant Pseudomonas aeruginosa and attenuation of its virulence using quorum sensing inhibitors: A critical review. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2021; 24:699-719. [PMID: 34630947 PMCID: PMC8487598 DOI: 10.22038/ijbms.2021.49151.11254] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 11/24/2020] [Indexed: 12/25/2022]
Abstract
A perilous increase in the number of bacterial infections has led to developing throngs of antibiotics for increasing the quality and expectancy of life. Pseudomonas aeruginosa is becoming resistant to all known conventional antimicrobial agents thereby posing a deadly threat to the human population. Nowadays, targeting virulence traits of infectious agents is an alternative approach to antimicrobials that is gaining much popularity to fight antimicrobial resistance. Quorum sensing (QS) involves interspecies communication via a chemical signaling pathway. Under this mechanism, cells work in a concerted manner, communicate with each other with the help of signaling molecules called auto-inducers (AI). The virulence of these strains is driven by genes, whose expression is regulated by AI, which in turn acts as transcriptional activators. Moreover, the problem of antibiotic-resistance in case of infections caused by P. aeruginosa becomes more alarming among immune-compromised patients, where the infectious agents easily take over the cellular machinery of the host while hidden in the QS mediated biofilms. Inhibition of the QS circuit of P. aeruginosa by targeting various signaling pathways such as LasR, RhlR, Pqs, and QScR transcriptional proteins will help in blocking downstream signal transducers which could result in reducing the bacterial virulence. The anti-virulence agent does not pose an immediate selective pressure on growing bacterium and thus reduces the pathogenicity without harming the target species. Here, we review exclusively, the growing emergence of multi-drug resistant (MDR) P. aeruginosa and the critical literature survey of QS inhibitors with their potential application of blocking P. aeruginosa infections.
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Affiliation(s)
- Snigdha Bhardwaj
- Department of Pharmaceutical Science, SHALOM Institute of Health and Allied Sciences, Sam Higginbottom University of Agriculture, Technology and Sciences (SHUATS), Naini, Prayagraj, India
| | - Sonam Bhatia
- Department of Pharmaceutical Science, SHALOM Institute of Health and Allied Sciences, Sam Higginbottom University of Agriculture, Technology and Sciences (SHUATS), Naini, Prayagraj, India
| | - Shaminder Singh
- Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurugram Expressway, Faridabad - 121 001, Haryana, India
| | - Francisco Franco Jr
- Department of Chemistry, De La Salle University, Manila, Metro Manila, Philippines
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Abstract
Antimicrobial resistance is a serious medical threat, particularly given the decreasing rate of discovery of new treatments. Although attempts to find new treatments continue, it has become clear that merely discovering new antimicrobials, even if they are new classes, will be insufficient. It is essential that new strategies be aggressively pursued. Toward that end, the search for treatments that can mitigate bacterial virulence and tilt the balance of host-pathogen interactions in favor of the host has become increasingly popular. In this review, we will discuss recent progress in this field, with a special focus on synthetic small molecule antivirulents that have been identified from high-throughput screens and on treatments that are effective against the opportunistic human pathogen Pseudomonas aeruginosa.
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Yaeger LN, Coles VE, Chan DCK, Burrows LL. How to kill Pseudomonas-emerging therapies for a challenging pathogen. Ann N Y Acad Sci 2021; 1496:59-81. [PMID: 33830543 DOI: 10.1111/nyas.14596] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 03/08/2021] [Accepted: 03/11/2021] [Indexed: 12/16/2022]
Abstract
As the number of effective antibiotics dwindled, antibiotic resistance (AR) became a pressing concern. Some Pseudomonas aeruginosa isolates are resistant to all available antibiotics. In this review, we identify the mechanisms that P. aeruginosa uses to evade antibiotics, including intrinsic, acquired, and adaptive resistance. Our review summarizes many different approaches to overcome resistance. Antimicrobial peptides have potential as therapeutics with low levels of resistance evolution. Rationally designed bacteriophage therapy can circumvent and direct evolution of AR and virulence. Vaccines and monoclonal antibodies are highlighted as immune-based treatments targeting specific P. aeruginosa antigens. This review also identifies promising drug combinations, antivirulence therapies, and considerations for new antipseudomonal discovery. Finally, we provide an update on the clinical pipeline for antipseudomonal therapies and recommend future avenues for research.
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Affiliation(s)
- Luke N Yaeger
- Department of Biochemistry and Biomedical Sciences and M.G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Victoria E Coles
- Department of Biochemistry and Biomedical Sciences and M.G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Derek C K Chan
- Department of Biochemistry and Biomedical Sciences and M.G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Lori L Burrows
- Department of Biochemistry and Biomedical Sciences and M.G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
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Martin I, Waters V, Grasemann H. Approaches to Targeting Bacterial Biofilms in Cystic Fibrosis Airways. Int J Mol Sci 2021; 22:ijms22042155. [PMID: 33671516 PMCID: PMC7926955 DOI: 10.3390/ijms22042155] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/14/2021] [Accepted: 02/15/2021] [Indexed: 12/12/2022] Open
Abstract
The treatment of lung infection in the context of cystic fibrosis (CF) is limited by a biofilm mode of growth of pathogenic organisms. When compared to planktonically grown bacteria, bacterial biofilms can survive extremely high levels of antimicrobials. Within the lung, bacterial biofilms are aggregates of microorganisms suspended in a matrix of self-secreted proteins within the sputum. These structures offer both physical protection from antibiotics as well as a heterogeneous population of metabolically and phenotypically distinct bacteria. The bacteria themselves and the components of the extracellular matrix, in addition to the signaling pathways that direct their behaviour, are all potential targets for therapeutic intervention discussed in this review. This review touches on the successes and failures of current anti-biofilm strategies, before looking at emerging therapies and the mechanisms by which it is hoped they will overcome current limitations.
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Affiliation(s)
- Isaac Martin
- Division of Respiratory Medicine, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON M5G 1X8, Canada;
- Correspondence:
| | - Valerie Waters
- Division of Infectious Diseases, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON M5G 1X8, Canada;
- Department of Paediatrics and Translational Medicine, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, ON M5G 0A4, Canada
| | - Hartmut Grasemann
- Division of Respiratory Medicine, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON M5G 1X8, Canada;
- Department of Paediatrics and Translational Medicine, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, ON M5G 0A4, Canada
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Ng RN, Tai AS, Chang BJ, Stick SM, Kicic A. Overcoming Challenges to Make Bacteriophage Therapy Standard Clinical Treatment Practice for Cystic Fibrosis. Front Microbiol 2021; 11:593988. [PMID: 33505366 PMCID: PMC7829477 DOI: 10.3389/fmicb.2020.593988] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 12/08/2020] [Indexed: 12/17/2022] Open
Abstract
Individuals with cystic fibrosis (CF) are given antimicrobials as prophylaxis against bacterial lung infection, which contributes to the growing emergence of multidrug resistant (MDR) pathogens isolated. Pathogens such as Pseudomonas aeruginosa that are commonly isolated from individuals with CF are armed with an arsenal of protective and virulence mechanisms, complicating eradication and treatment strategies. While translation of phage therapy into standard care for CF has been explored, challenges such as the lack of an appropriate animal model demonstrating safety in vivo exist. In this review, we have discussed and provided some insights in the use of primary airway epithelial cells to represent the mucoenvironment of the CF lungs to demonstrate safety and efficacy of phage therapy. The combination of phage therapy and antimicrobials is gaining attention and has the potential to delay the onset of MDR infections. It is evident that efforts to translate phage therapy into standard clinical practice have gained traction in the past 5 years. Ultimately, collaboration, transparency in data publications and standardized policies are needed for clinical translation.
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Affiliation(s)
- Renee N. Ng
- School of Biomedical Sciences, The University of Western Australia, Perth, WA, Australia
- Wal-yan Respiratory Research Center, Telethon Kids Institute, The University of Western Australia, Crawley, WA, Australia
| | - Anna S. Tai
- Department of Respiratory Medicine, Sir Charles Gairdner Hospital, Perth, WA, Australia
- Institute for Respiratory Health, School of Medicine, The University of Western Australia, Perth, WA, Australia
| | - Barbara J. Chang
- The Marshall Center for Infectious Diseases Research and Training, School of Biomedical Sciences, The University of Western Australia, Perth, WA, Australia
| | - Stephen M. Stick
- Wal-yan Respiratory Research Center, Telethon Kids Institute, The University of Western Australia, Crawley, WA, Australia
- Department of Respiratory and Sleep Medicine, Perth Children’s Hospital, Perth, WA, Australia
- Center for Cell Therapy and Regenerative Medicine, School of Medicine and Pharmacology, The University of Western Australia and Harry Perkins Institute of Medical Research, Perth, WA, Australia
| | - Anthony Kicic
- Wal-yan Respiratory Research Center, Telethon Kids Institute, The University of Western Australia, Crawley, WA, Australia
- Department of Respiratory and Sleep Medicine, Perth Children’s Hospital, Perth, WA, Australia
- Center for Cell Therapy and Regenerative Medicine, School of Medicine and Pharmacology, The University of Western Australia and Harry Perkins Institute of Medical Research, Perth, WA, Australia
- Occupation and the Environment, School of Public Health, Curtin University, Perth, WA, Australia
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Yang W, Wei Q, Tong Q, Cui K, He G, Lin L, Ma LZ, Cornelis P, Wang Y. Traditional Chinese Medicine Tanreqing Inhibits Quorum Sensing Systems in Pseudomonas aeruginosa. Front Microbiol 2020; 11:517462. [PMID: 33391189 PMCID: PMC7775676 DOI: 10.3389/fmicb.2020.517462] [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: 12/04/2019] [Accepted: 11/09/2020] [Indexed: 12/19/2022] Open
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen that can infect a wide variety of hosts including humans, plants, and animals. The production of virulence factors is the determinant of the infection paradigm and is under orchestrated regulation via cell-to-cell communication process called quorum sensing (QS). To disable QS circuits and prevent bacterial infections, a large battery of anti-QS agents, particularly from traditional Chinese medicine have been developed. Here, we used P. aeruginosa as a model microorganism to investigate the effect of traditional Chinese medicine Tanreqing (TRQ) formula on bacterial pathogenicity. Phenotypic analysis showed that TRQ treatment could completely inhibit the production of phenazine pyocyanin and moderately inhibit the production of virulence factors such as rhamnolipids, elastase, and alkaline protease. Further transcriptomic analyses revealed that TRQ treatment could significantly attenuate the expression of QS-regulated genes in P. aeruginosa and TRQ-treated P. aeruginosa regulon shared a large overlap with QS regulon. Component contribution to QS inhibition shed light on the indispensable role of all five components in TRQ formula. Further genetic analysis indicated that upstream regulators of QS systems, including two-component systems GacS/GacA and PprA/PprB, were both inhibited by TRQ treatment. Finally, our TRQ formula could efficiently protect Caenorhabditis elegans from killing by P. aeruginosa. Altogether, we have proved TRQ formula as an effective and specific agent to attenuate bacterial virulence and combat bacterial infections.
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Affiliation(s)
- Weifeng Yang
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing, China
| | - Qing Wei
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland.,State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Qian Tong
- School of Biological Engineering and Food Science, Hubei University of Technology, Wuhan, China
| | - Kaiyu Cui
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing, China
| | - Gaiying He
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing, China
| | - Longfei Lin
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
| | - Lvyan Z Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Pierre Cornelis
- Department of Bioengineering Sciences, Microbiology Unit, Vrije Universiteit Brussel, Brussels, Belgium.,Université de Rouen Normandie, Normandie Université, Laboratoire de Microbiologie Signaux et Microenvironnement, LMSM EA4312, Évreux, France
| | - Yi Wang
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing, China
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Wu S, Liu C, Feng J, Yang A, Guo F, Qiao J. QSIdb: quorum sensing interference molecules. Brief Bioinform 2020; 22:5916938. [PMID: 33003203 DOI: 10.1093/bib/bbaa218] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 08/15/2020] [Accepted: 08/17/2020] [Indexed: 12/30/2022] Open
Abstract
Quorum sensing interference (QSI), the disruption and manipulation of quorum sensing (QS) in the dynamic control of bacteria populations could be widely applied in synthetic biology to realize dynamic metabolic control and develop potential clinical therapies. Conventionally, limited QSI molecules (QSIMs) were developed based on molecular structures or for specific QS receptors, which are in short supply for various interferences and manipulations of QS systems. In this study, we developed QSIdb (http://qsidb.lbci.net/), a specialized repository of 633 reported QSIMs and 73 073 expanded QSIMs including both QS agonists and antagonists. We have collected all reported QSIMs in literatures focused on the modifications of N-acyl homoserine lactones, natural QSIMs and synthetic QS analogues. Moreover, we developed a pipeline with SMILES-based similarity assessment algorithms and docking-based validations to mine potential QSIMs from existing 138 805 608 compounds in the PubChem database. In addition, we proposed a new measure, pocketedit, for assessing the similarities of active protein pockets or QSIMs crosstalk, and obtained 273 possible potential broad-spectrum QSIMs. We provided user-friendly browsing and searching facilities for easy data retrieval and comparison. QSIdb could assist the scientific community in understanding QS-related therapeutics, manipulating QS-based genetic circuits in metabolic engineering, developing potential broad-spectrum QSIMs and expanding new ligands for other receptors.
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Affiliation(s)
- Shengbo Wu
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Chunjiang Liu
- State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, China
| | - Jie Feng
- School of Computer Science and Technology, College of Intelligence and Computing, Tianjin University, Tianjin, China
| | - Aidong Yang
- Department of Engineering Science, University of Oxford, Oxford, UK
| | - Fei Guo
- School of Computer Science and Technology, College of Intelligence and Computing, Tianjin University, Tianjin, China
| | - Jianjun Qiao
- Key Laboratory of Systems Bioengineering, Ministry of Education (Tianjin University) and Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin, China
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Shao X, Xie Y, Zhang Y, Liu J, Ding Y, Wu M, Wang X, Deng X. Novel therapeutic strategies for treating Pseudomonas aeruginosa infection. Expert Opin Drug Discov 2020; 15:1403-1423. [PMID: 32880507 DOI: 10.1080/17460441.2020.1803274] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Persistent infections caused by the superbug Pseudomonas aeruginosa and its resistance to multiple antimicrobial agents are huge threats to patients with cystic fibrosis as well as those with compromised immune systems. Multidrug-resistant P. aeruginosa has posed a major challenge to conventional antibiotics and therapeutic approaches, which show limited efficacy and cause serious side effects. The public demand for new antibiotics is enormous; yet, drug development pipelines have started to run dry with limited targets available for inventing new antibacterial drugs. Consequently, it is important to uncover potential therapeutic targets. AREAS COVERED The authors review the current state of drug development strategies that are promising in terms of the development of novel and potent drugs to treat P. aeruginosa infection. EXPERT OPINION The prevention of P. aeruginosa infection is increasingly challenging. Furthermore, targeting key virulence regulators has great potential for developing novel anti-P. aeruginosa drugs. Additional promising strategies include bacteriophage therapy, immunotherapies, and antimicrobial peptides. Additionally, the authors believe that in the coming years, the overall network of molecular regulatory mechanism of P. aeruginosa virulence will be fully elucidated, which will provide more novel and promising drug targets for treating P. aeruginosa infections.
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Affiliation(s)
- Xiaolong Shao
- Department of Biomedical Sciences, City University of Hong Kong , Hong Kong SAR, China
| | - Yingpeng Xie
- Department of Biomedical Sciences, City University of Hong Kong , Hong Kong SAR, China
| | - Yingchao Zhang
- Department of Biomedical Sciences, City University of Hong Kong , Hong Kong SAR, China
| | - Jingui Liu
- Department of Biomedical Sciences, City University of Hong Kong , Hong Kong SAR, China
| | - Yiqing Ding
- Department of Biomedical Sciences, City University of Hong Kong , Hong Kong SAR, China
| | - Min Wu
- Department of Biomedical Sciences, University of North Dakota , Grand Forks, North Dakota, USA
| | - Xin Wang
- Department of Biomedical Sciences, City University of Hong Kong , Hong Kong SAR, China
| | - Xin Deng
- Department of Biomedical Sciences, City University of Hong Kong , Hong Kong SAR, China.,Shenzhen Research Institute, City University of Hong Kong , Shenzhen, China
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A novel scaffold to fight Pseudomonas aeruginosa pyocyanin production: early steps to novel antivirulence drugs. Future Med Chem 2020; 12:1489-1503. [PMID: 32772556 DOI: 10.4155/fmc-2019-0351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Aim: Although bacterial resistance is a growing concern worldwide, the development of antibacterial drugs has been steadily decreasing. One alternative to fight this issue relies on reducing the bacteria virulence without killing it. PhzS plays a pivotal role in pyocyanin production in Pseudomonas aeruginosa. Results: A total of 31 thiazolidinedione derivatives were evaluated as putative PhzS inhibitors, using thermo shift assays. Compounds that significantly shifted PhzS's Tm had their mode of inhibition (cofactor competitor) and affinity calculated by thermo shift assays as well. The most promising compound (E)-5-(4-((4-oxo-3-phenyl-3,4-dihydroquinazolin-2-yl)methoxy)benzylidene)thiazolidine-2,4-dione had their affinity confirmed by microscale thermophoresis (Kd = 18 μM). Cellular assays suggest this compound reduces pyocyanin production in vitro, but does not affect P. aeruginosa viability. Conclusion: The first inhibitor of PhzS is described.
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Khan F, Javaid A, Kim YM. Functional Diversity of Quorum Sensing Receptors in Pathogenic Bacteria: Interspecies, Intraspecies and Interkingdom Level. Curr Drug Targets 2020; 20:655-667. [PMID: 30468123 DOI: 10.2174/1389450120666181123123333] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 11/16/2018] [Accepted: 11/16/2018] [Indexed: 01/17/2023]
Abstract
The formation of biofilm by pathogenic bacteria is considered as one of the most powerful mechanisms/modes of resistance against the action of several antibiotics. Biofilm is formed as a structural adherent over the surfaces of host, food and equipments etc. and is further functionally coordinated by certain chemicals produced itself. These chemicals are known as quorum sensing (QS) signaling molecules and are involved in the cross talk at interspecies, intraspecies and interkingdom levels thus resulting in the production of virulence factors leading to pathogenesis. Bacteria possess receptors to sense these chemicals, which interact with the incoming QS molecules. It is followed by the secretion of virulence molecules, regulation of bioluminescence, biofilm formation, antibiotic resistance development and motility behavioral responses. In the natural environment, different bacterial species (Gram-positive and Gram-negative) produce QS signaling molecules that are structurally and functionally different. Recent and past research shows that various antagonistic molecules (naturally and chemically synthesized) are characterized to inhibit the formation of biofilm and attenuation of bacterial virulence by blocking the QS receptors. This review article describes about the diverse QS receptors at their structural, functional and production levels. Thus, by blocking these receptors with inhibitory molecules can be a potential therapeutic approach to control pathogenesis. Furthermore, these receptors can also be used as a structural platform to screen the most potent inhibitors with the help of bioinformatics approaches.
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Affiliation(s)
- Fazlurrahman Khan
- Marine-Integrated Bionics Research Center, Pukyong National University, Busan 48513, South Korea.,Department of Biotechnology, School of Engineering and Technology, Sharda University, Greater Noida 201306, U.P, India
| | - Aqib Javaid
- Department of Biotechnology, School of Engineering and Technology, Sharda University, Greater Noida 201306, U.P, India
| | - Young-Mog Kim
- Marine-Integrated Bionics Research Center, Pukyong National University, Busan 48513, South Korea.,Department of Food Science and Technology, Pukyong National University, Busan 48513, South Korea
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41
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El-Mowafy M, Elgaml A, Shaaban M. New Approaches for Competing Microbial Resistance and Virulence. Microorganisms 2020. [DOI: 10.5772/intechopen.90388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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Manson DE, O’Reilly MC, Nyffeler KE, Blackwell HE. Design, Synthesis, and Biochemical Characterization of Non-Native Antagonists of the Pseudomonas aeruginosa Quorum Sensing Receptor LasR with Nanomolar IC 50 Values. ACS Infect Dis 2020; 6:649-661. [PMID: 32037806 DOI: 10.1021/acsinfecdis.9b00518] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Quorum sensing (QS), a bacterial cell-to-cell communication system mediated by small molecules and peptides, has received significant interest as a potential target to block infection. The common pathogen Pseudomonas aeruginosa uses QS to regulate many of its virulence phenotypes at high cell densities, and the LasR QS receptor plays a critical role in this process. Small molecule tools that inhibit LasR activity would serve to illuminate its role in P. aeruginosa virulence, but we currently lack highly potent and selective LasR antagonists, despite considerable research in this area. V-06-018, an abiotic small molecule discovered in a high-throughput screen, represents one of the most potent known LasR antagonists but has seen little study since its initial report. Herein, we report a systematic study of the structure-activity relationships (SARs) that govern LasR antagonism by V-06-018. We synthesized a focused library of V-06-018 derivatives and evaluated the library for bioactivity using a variety of cell-based LasR reporter systems. The SAR trends revealed by these experiments allowed us to design probes with 10-fold greater potency than that of V-06-018 and 100-fold greater potency than other commonly used N-acyl-l-homoserine lactone (AHL)-based LasR antagonists, along with high selectivities for LasR. Biochemical experiments to probe the mechanism of antagonism by V-06-018 and its analogues support these compounds interacting with the native ligand-binding site in LasR and, at least in part, stabilizing an inactive form of the protein. The compounds described herein are the most potent and efficacious antagonists of LasR known and represent robust probes both for characterizing the mechanisms of LuxR-type QS and for chemical biology research in general in the growing QS field.
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Affiliation(s)
- Daniel E. Manson
- Department of Chemistry, University of Wisconsin−Madison, 110 University Ave., Madison, Wisconsin 53706 United States
| | - Matthew C. O’Reilly
- Department of Chemistry, University of Wisconsin−Madison, 110 University Ave., Madison, Wisconsin 53706 United States
| | - Kayleigh E. Nyffeler
- Department of Chemistry, University of Wisconsin−Madison, 110 University Ave., Madison, Wisconsin 53706 United States
| | - Helen E. Blackwell
- Department of Chemistry, University of Wisconsin−Madison, 110 University Ave., Madison, Wisconsin 53706 United States
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Froes TQ, Baldini RL, Vajda S, Castilho MS. Structure-based Druggability Assessment of Anti-virulence Targets from Pseudomonas aeruginosa. Curr Protein Pept Sci 2020; 20:1189-1203. [PMID: 31038064 DOI: 10.2174/1389203720666190417120758] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 02/12/2019] [Accepted: 02/28/2019] [Indexed: 11/22/2022]
Abstract
Antimicrobial Resistance (AMR) represents a serious threat to health and the global economy. However, interest in antibacterial drug development has decreased substantially in recent decades. Meanwhile, anti-virulence drug development has emerged as an attractive alternative to fight AMR. Although several macromolecular targets have been explored for this goal, their druggability is a vital piece of information that has been overlooked. This review explores this subject by showing how structure- based freely available in silico tools, such as PockDrug and FTMap, might be useful for designing novel inhibitors of the pyocyanin biosynthesis pathway and improving the potency/selectivity of compounds that target the Pseudomonas aeruginosa quorum sensing mechanism. The information provided by hotspot analysis, along with binding site features, reveals novel druggable targets (PhzA and PhzS) that remain largely unexplored. However, it also highlights that in silico druggability prediction tools have several limitations that might be overcome in the near future. Meanwhile, anti-virulence drug targets should be assessed by complementary methods, such as the combined use of FTMap/PockDrug, once the consensus druggability classification reduces the risk of wasting resources on undruggable proteins.
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Affiliation(s)
- Thamires Q Froes
- Programa de Pos-Graduacao em Biotecnologia da Universidade Estadual de Feira de Santana, Feira de Santana, BA, Brazil.,aculdade de Farmácia da Universidade Federal da Bahia, Bahia, Salvador, BA, Brazil
| | - Regina L Baldini
- Departamento de Bioquimica, Instituto de Quimica, Universidade de Sao Paulo. Sao Paulo, SP, Brazil
| | - Sandor Vajda
- College of Engineering, Boston University, Boston, MA, United States
| | - Marcelo S Castilho
- Programa de Pos-Graduacao em Biotecnologia da Universidade Estadual de Feira de Santana, Feira de Santana, BA, Brazil.,aculdade de Farmácia da Universidade Federal da Bahia, Bahia, Salvador, BA, Brazil.,College of Engineering, Boston University, Boston, MA, United States
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44
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Wei Q, Bhasme P, Wang Z, Wang L, Wang S, Zeng Y, Wang Y, Ma LZ, Li Y. Chinese medicinal herb extract inhibits PQS-mediated quorum sensing system in Pseudomonas aeruginosa. JOURNAL OF ETHNOPHARMACOLOGY 2020; 248:112272. [PMID: 31586695 DOI: 10.1016/j.jep.2019.112272] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 09/24/2019] [Accepted: 10/02/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Chinese medicinal herbs have long been recognized as important resources that can be used for the struggle against diseases and a significant component of health care system for thousands of years. AIM OF THE STUDY In order to understand their roles in the treatment against bacterial infections, we examined the underlying mechanisms of one of the medicinal herb extracts (MHE) (Artemisiae argyi Folium, the root bark of Cortex dictamni and the root of Solanum melongena) on the human opportunistic pathogen Pseudomonas aeruginosa. MATERIALS AND METHODS We combined phenotypic assays, transcriptional analysis and chemical investigations to identify the mechanisms underlying MHE inhibition. The standard sample was prepared and transcriptional reporters for quorum sensing systems were constructed. Electrophoretic mobility shift assays were used to clarify the mechanism. GC-MS and molecular docking were used to identify the chemicals in MHE and potential binding agents. RESULTS We found that co-culturing of MHE with bacterial cells did not change the growth rate but substantially attenuate the production of virulence factors such as phenazine pyocyanin, siderophore pyoverdine and biofilm formation. Transcriptional responses of three major quorum sensing (QS) systems of P. aeruginosa to MHE showed that Pseudomonas quinolone signaling (PQS) system was completely repressed, rhlR/rhlI QS system was moderately inhibited, while lasR/lasI QS system was only slightly affected, suggesting that MHE might selectively target the PQS system to inhibit bacterial virulence. Furthermore, electrophoretic mobility shift assays (EMSA) showed that MHE inhibited the binding of MvfR the corresponding pqsA promoter region, suggesting that MHE serves as a competitive agent to quench the QS functionality in P. aeruginosa. CONCLUSION We prove that MHE functions as an effective countermeasure against bacterial infections.
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Affiliation(s)
- Qing Wei
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China; State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, China
| | - Pramod Bhasme
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhiguo Wang
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences/Guizhou Provincial Engineering Research Center for Natural Drugs, Guiyang, Guizhou, 550014, China; Pneumology Department of Yanan University Affiliated Hospital, Yanan, Shannxi, 716000, China
| | - Li Wang
- Clinical Laboratory of Yanan University Affiliated Hospital, Yanan, Shannxi, 716000, China
| | - Shiwei Wang
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, Xi'an, Shaanxi, 710069, China
| | - Yunfei Zeng
- Yanan Institute of Traditional Chinese Medicine, Yanan, Shaanxi, 716000, China
| | - Yi Wang
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Luyan Z Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yan Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences/Guizhou Provincial Engineering Research Center for Natural Drugs, Guiyang, Guizhou, 550014, China.
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Camp JE, Nyamini SB, Scott FJ. Cyrene™ is a green alternative to DMSO as a solvent for antibacterial drug discovery against ESKAPE pathogens. RSC Med Chem 2019; 11:111-117. [PMID: 33479610 DOI: 10.1039/c9md00341j] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 08/24/2019] [Indexed: 02/04/2023] Open
Abstract
Dimethyl sulfoxide (DMSO) is currently employed across the biomedical field, from cryopreservation to in vitro assays, despite the fact that it has been shown to have an assortment of biologically relevant effects. The amphiphilic nature of DMSO along with its relatively low toxicity at dilute concentrations make it a challenging solvent to replace. A possible alternative is Cyrene™ (dihydrolevoglucosenone), an aprotic dipolar solvent that is derived from waste biomass. In addition to being a green solvent, Cyrene™ has comparable solvation properties and is reported to have low toxicity. Herein the abilities of the two solvents to solubilize drug compounds and to act as non-participatory vehicles in drug discovery for antibacterials are compared. It was demonstrate that the results of standardised antimicrobial susceptibility testing do not differ between drugs prepared from either Cyrene™ or DMSO stock. Moreover, in contrast to DMSO, Cyrene™ does not offer protection from ROS mediated killing of bacteria and may therefore be an improvement over DMSO as a vehicle in antimicrobial drug discovery.
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Affiliation(s)
- Jason E Camp
- Department of Chemical Sciences , University of Huddersfield , Queensgate , Huddersfield , UK.,Department of Chemistry , University of Bath , Bath , UK
| | - Simbarashe B Nyamini
- Department of Chemical Sciences , University of Huddersfield , Queensgate , Huddersfield , UK
| | - Fraser J Scott
- Department of Pure and Applied Chemistry , University of Strathclyde , Glasgow , Scotland , UK .
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Galdino ACM, de Oliveira MP, Ramalho TC, de Castro AA, Branquinha MH, Santos ALS. Anti-Virulence Strategy against the Multidrug-Resistant Bacterial Pathogen Pseudomonas aeruginosa: Pseudolysin (Elastase B) as a Potential Druggable Target. Curr Protein Pept Sci 2019; 20:471-487. [PMID: 30727891 DOI: 10.2174/1389203720666190207100415] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 01/26/2019] [Accepted: 01/31/2019] [Indexed: 11/22/2022]
Abstract
Pseudomonas aeruginosa is a non-fermentative, gram-negative bacterium that is one of the most common pathogens responsible for hospital-acquired infections worldwide. The management of the infections caused by P. aeruginosa represents a huge challenge in the healthcare settings due to the increased emergence of resistant isolates, some of them resistant to all the currently available antimicrobials, which results in elevated morbimortality rates. Consequently, the development of new therapeutic strategies against multidrug-resistant P. aeruginosa is urgent and needful. P. aeruginosa is wellrecognized for its extreme genetic versatility and its ability to produce a lush variety of virulence factors. In this context, pseudolysin (or elastase B) outstands as a pivotal virulence attribute during the infectious process, playing multifunctional roles in different aspects of the pathogen-host interaction. This protein is a 33-kDa neutral zinc-dependent metallopeptidase that is the most abundant peptidase found in pseudomonal secretions, which contributes to the invasiveness of P. aeruginosa due to its ability to cleave several extracellular matrix proteins and to disrupt the basolateral intercellular junctions present in the host tissues. Moreover, pseudolysin makes P. aeruginosa able to overcome host defenses by the hydrolysis of many immunologically relevant molecules, including antibodies and complement components. The attenuation of this striking peptidase therefore emerges as an alternative and promising antivirulence strategy to combat antibiotic-refractory infections caused by P. aeruginosa. The anti-virulence approach aims to disarm the P. aeruginosa infective arsenal by inhibiting the expression/activity of bacterial virulence factors in order to reduce the invasiveness of P. aeruginosa, avoiding the emergence of resistance since the proliferation is not affected. This review summarizes the most relevant features of pseudolysin and highlights this enzyme as a promising target for the development of new anti-virulence compounds.
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Affiliation(s)
- Anna Clara M Galdino
- Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Goes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,Programa de Pós-Graduação em Bioquímica, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Matheus P de Oliveira
- Department of Integrative Biology and Physiology, University of California, Los Angeles, CA, United States
| | - Teodorico C Ramalho
- Departamento de Quimica, Universidade Federal de Lavras, Minas Gerais, Brazil
| | | | - Marta H Branquinha
- Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Goes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - André L S Santos
- Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Goes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,Programa de Pós-Graduação em Bioquímica, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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In vitro anti-biofilm activity of 14-deoxy-11,12-didehydroandrographolide from Andrographis paniculata against Pseudomonas aeruginosa. Braz J Microbiol 2019; 51:15-27. [PMID: 31691922 DOI: 10.1007/s42770-019-00169-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 10/03/2019] [Indexed: 10/25/2022] Open
Abstract
14-Deoxy-11,12-didehydroandrographolide is a biologically active molecule present in the extract of Andrographis paniculata (Kalmegh), a classic ethnic herbal formula, which has been used for over thousand years as therapeutics to treat numerous infectious diseases like upper respiratory tract infection, urinary tract infection, and many more health issues. The present study is designed to ascertain an inhibitor against biofilm formation from the major metabolites of Andrographis paniculata, because the extract of this herb shows inhibition of bacterial quorum sensing (QS) communication and biofilm development against microorganisms. 14-Deoxy-11,12-didehydroandrographolide at 0.1 mM (sub-MIC dose) with azithromycin (6 μg/mL, sub-MIC) or gentamicin (4 μg/mL, sub-MIC) synergistically inhibits 92% biofilm production by a 48-h treatment against Pseudomonas aeruginosa. Further investigation carried out by atomic force microscopy shows promising reduction in roughness and height of biofilm in the presence of 14-deoxy-11,12-didehydroandrographolide compared with the control group. The content of extracellular polymeric substances, level of pyocyanin production, and synthesis of extracellular protease by P. aeruginosa have also been reduced significantly at around 90% in 14-deoxy-11,12-didehydroandrographolide-treated group. In conclusion, 14-deoxy-11,12-didehydroandrographolide could be used as a drug molecule against biofilm development by inhibiting QS pathway in Pseudomonas aeruginosa.
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Design, synthesis, and evaluation of compounds capable of reducing Pseudomonas aeruginosa virulence. Eur J Med Chem 2019; 185:111800. [PMID: 31706639 DOI: 10.1016/j.ejmech.2019.111800] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 10/16/2019] [Accepted: 10/17/2019] [Indexed: 12/26/2022]
Abstract
Anti-virulence approaches in the treatment of Pseudomonas aeruginosa (PA)-induced infections have shown clinical potential in multiple in vitro and in vivo studies. However, development of these compounds is limited by several factors, including the lack of molecules capable of penetrating the membrane of gram-negative organisms. Here, we report the identification of novel structurally diverse compounds that inhibit PqsR and LasR-based signaling and diminish virulence factor production and biofilm growth in two clinically relevant strains of P. aeruginosa. It is the first report where potential anti-virulent agents were evaluated for inhibition of several virulence factors of PA. Finally, co-treatment with these inhibitors significantly reduced the production of virulence factors induced by the presence of sub-inhibitory levels of ciprofloxacin. Further, we have analyzed the drug-likeness profile of designed compounds using quantitative estimates of drug-likeness (QED) and confirmed their potential as hit molecules for further development.
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Maurice NM, Bedi B, Sadikot RT. Pseudomonas aeruginosa Biofilms: Host Response and Clinical Implications in Lung Infections. Am J Respir Cell Mol Biol 2019; 58:428-439. [PMID: 29372812 DOI: 10.1165/rcmb.2017-0321tr] [Citation(s) in RCA: 204] [Impact Index Per Article: 40.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Pseudomonas aeruginosa is a major health challenge that causes recalcitrant multidrug-resistant infections, especially in immunocompromised and hospitalized patients. P. aeruginosa is an important cause of nosocomial and ventilator-associated pneumonia characterized by high prevalence and fatality rates. P. aeruginosa also causes chronic lung infections in individuals with cystic fibrosis. Multidrug- and totally drug-resistant strains of P. aeruginosa are increasing threats that contribute to high mortality in these patients. The pathogenesis of many P. aeruginosa infections depends on its ability to form biofilms, structured bacterial communities that can coat mucosal surfaces or invasive devices. These biofilms make conditions more favorable for bacterial persistence, as embedded bacteria are inherently more difficult to eradicate than planktonic bacteria. The molecular mechanisms that underlie P. aeruginosa biofilm pathogenesis and the host response to P. aeruginosa biofilms remain to be fully defined. However, it is known that biofilms offer protection from the host immune response and are also extremely recalcitrant to antimicrobial therapy. Therefore, development of novel therapeutic strategies specifically aimed at biofilms is urgently needed. Here, we review the host response, key clinical implications of P. aeruginosa biofilms, and novel therapeutic approaches to treat biofilms relevant to lung infections. Greater understanding of P. aeruginosa biofilms will elucidate novel avenues to improve outcomes for P. aeruginosa pulmonary infections.
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Affiliation(s)
- Nicholas M Maurice
- 1 Atlanta Veterans Affairs Medical Center, Decatur, Georgia; and.,2 Department of Medicine Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Emory University, Atlanta, Georgia
| | - Brahmchetna Bedi
- 1 Atlanta Veterans Affairs Medical Center, Decatur, Georgia; and
| | - Ruxana T Sadikot
- 1 Atlanta Veterans Affairs Medical Center, Decatur, Georgia; and.,2 Department of Medicine Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Emory University, Atlanta, Georgia
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Ni S, Li B, Xu Y, Mao F, Li X, Lan L, Zhu J, Li J. Targeting virulence factors as an antimicrobial approach: Pigment inhibitors. Med Res Rev 2019; 40:293-338. [PMID: 31267561 DOI: 10.1002/med.21621] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 05/30/2019] [Accepted: 06/13/2019] [Indexed: 12/19/2022]
Abstract
The fascinating and dangerous colored pathogens contain unique chemically pigmented molecules, which give varied and efficient assistance as virulence factors to the crucial reproduction and growth of microbes. Therefore, multiple novel strategies and inhibitors have been developed in recent years that target virulence factor pigments. However, despite the importance and significance of this topic, it has not yet been comprehensively reviewed. Moreover, research groups around the world have made successful progress against antibacterial infections by targeting pigment production, including our serial works on the discovery of CrtN inhibitors against staphyloxanthin production in Staphylococcus aureus. On the basis of the previous achievements and recent progress of our group in this field, this article will be the first comprehensive review of pigment inhibitors against colored pathogens, especially S. aureus infections, and this article includes design strategies, representative case studies, advantages, limitations, and perspectives to guide future research.
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Affiliation(s)
- Shuaishuai Ni
- Cancer Institute, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Baoli Li
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Yixiang Xu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Fei Mao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Xiaokang Li
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Lefu Lan
- State Key Laboratory of Drug Research, Shanghai Institute of Material Medical, Chinese Academy of Sciences, Shanghai, China
| | - Jin Zhu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Jian Li
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China.,Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, Shanghai, China
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