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Mesas Vaz C, Guembe Mülberger A, Torrent Burgas M. The battle within: how Pseudomonas aeruginosa uses host-pathogen interactions to infect the human lung. Crit Rev Microbiol 2024:1-36. [PMID: 39381985 DOI: 10.1080/1040841x.2024.2407378] [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: 12/27/2023] [Revised: 08/11/2024] [Accepted: 09/17/2024] [Indexed: 10/10/2024]
Abstract
Pseudomonas aeruginosa is a versatile Gram-negative pathogen known for its ability to invade the respiratory tract, particularly in cystic fibrosis patients. This review provides a comprehensive analysis of the multifaceted strategies for colonization, virulence, and immune evasion used by P. aeruginosa to infect the host. We explore the extensive protein arsenal of P. aeruginosa, including adhesins, exotoxins, secreted proteases, and type III and VI secretion effectors, detailing their roles in the infective process. We also address the unique challenge of treating diverse lung conditions that provide a natural niche for P. aeruginosa on the airway surface, with a particular focus in cystic fibrosis. The review also discusses the current limitations in treatment options due to antibiotic resistance and highlights promising future approaches that target host-pathogen protein-protein interactions. These approaches include the development of new antimicrobials, anti-attachment therapies, and quorum-sensing inhibition molecules. In summary, this review aims to provide a holistic understanding of the pathogenesis of P. aeruginosa in the respiratory system, offering insights into the underlying molecular mechanisms and potential therapeutic interventions.
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Affiliation(s)
- Carmen Mesas Vaz
- The Systems Biology of Infection Lab, Department of Biochemistry and Molecular Biology, Biosciences Faculty, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
| | - Alba Guembe Mülberger
- The Systems Biology of Infection Lab, Department of Biochemistry and Molecular Biology, Biosciences Faculty, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
| | - Marc Torrent Burgas
- The Systems Biology of Infection Lab, Department of Biochemistry and Molecular Biology, Biosciences Faculty, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
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2
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Kabir RB, Ahsan T, Rahman MF, Jobayer M, Shamsuzzaman SM. Biofilm-producing and specific antibiotic resistance genes in Pseudomonas aeruginosa isolated from patients admitted to a tertiary care hospital, Bangladesh. IJID REGIONS 2024; 11:100369. [PMID: 38799795 PMCID: PMC11126856 DOI: 10.1016/j.ijregi.2024.100369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 04/21/2024] [Accepted: 04/22/2024] [Indexed: 05/29/2024]
Abstract
Objectives Biofilms are responsible for persistent infections and antimicrobial resistance. Pseudomonas aeruginosa was investigated with its ability to form biofilm by detecting genes responsible for producing biofilms and biofilm-specific antimicrobial resistance. The association between antibiotic resistance and biofilm was investigated. Methods This cross-sectional study was conducted from July 2017 to December 2018. A total of 446 samples (infected burn, surgical wounds, and endotracheal aspirate) were collected from admitted patients of Dhaka Medical College and Hospital, Bangladesh. P. aeruginosa was isolated and identified by biochemical tests and polymerase chain reaction. Biofilm production by tissue culture plate method followed by detection of biofilm-producing genes (pqsA, pslA, pslD, pslH, pelA, lasR) and biofilm-specific antibiotic resistance genes (ndvB, PA1874, PA1876, PA1877) by polymerase chain reaction were done. Antibiotic susceptibility test was carried out by disk diffusion method; for colistin agar dilution method of minimal inhibitory concentration was followed. Results Among 232 (52.02%) positive strains of P. aeruginosa, 24 (10.30%) produced biofilms in tissue culture plate. Among biofilm-producing genes, pqsA was the highest (79.17%). pslA and pelA were 70.83%, pslD 45.83%, pslH and lasR 37.5%. Among biofilm-specific antibiotic resistance genes, 16.67% were ndvB, and 8.33% were PA1874 and PA1877. Biofilm-forming strains were significantly resistant to colistin. Conclusions Detection of biofilm-forming genes may be a good tool for the evaluation of biofilm production, which will help in prompt and better management of chronic or device-associated infections.
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Affiliation(s)
| | - Tasnim Ahsan
- Department of Microbiology, Ibn Sina Medical College, Dhaka, Bangladesh
| | - Md. Faizur Rahman
- Department of Microbiology, Dhaka Medical College, Dhaka, Bangladesh
| | - Mohammad Jobayer
- Department of Microbiology, Dhaka Medical College, Dhaka, Bangladesh
| | - SM Shamsuzzaman
- Department of Microbiology, Dhaka Medical College, Dhaka, Bangladesh
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3
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Wang H, Guo D, Zhang M, Wu G, Shi Y, Zhou J, Ding N, Chen X, Li X. Correlation study on microbial communities and volatile flavor compounds in cigar tobacco leaves of diverse origins. Appl Microbiol Biotechnol 2024; 108:236. [PMID: 38407656 PMCID: PMC10896874 DOI: 10.1007/s00253-024-13032-6] [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: 08/28/2023] [Revised: 01/21/2024] [Accepted: 01/25/2024] [Indexed: 02/27/2024]
Abstract
To elucidate the significant influence of microorganisms on geographically dependent flavor formation by analyzing microbial communities and volatile flavor compounds (VFCs) in cigar tobacco leaves (CTLs) obtained from China, Dominica, and Indonesia. Microbiome analysis revealed that the predominant bacteria in CTLs were Staphylococcus, Aerococcus, Pseudomonas, and Lactobacillus, while the predominant fungi were Aspergillus, Wallemia, and Sampaiozyma. The microbial communities of CTLs from different origins differed to some extent, and the diversity and abundance of bacteria were greater than fungi. Metabolomic analysis revealed that 64 VFCs were identified, mainly ketones, of which 23 VFCs could be utilized to identify the geographical origins of CTLs. Sixteen VFCs with OAV greater than 1, including cedrol, phenylacetaldehyde, damascone, beta-damascone, and beta-ionone, play important roles in shaping the flavor profile of CTLs from different origins. Combined with the correlation analysis, bacterial microorganisms were more closely related to key VFCs and favored a positive correlation. Bacillus, Vibrio, and Sphingomonas were the main flavor-related bacteria. The study demonstrated that the predominant microorganisms were essential for the formation of key flavor qualities in CTLs, which provided a theoretical reference for flavor control of CTLs by microbial technology. KEY POINTS: • It is the high OAV VFCs that determine the flavor profile of CTLs. • The methylerythritol phosphate (MEP) pathway and the carotenoid synthesis pathway are key metabolic pathways for the formation of VFCs in CTLs. • Microbial interactions influence tobacco flavor, with bacterial microorganisms contributing more to the flavor formation of CTLs.
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Affiliation(s)
- Haiqing Wang
- Anhui Fermented Food Engineering Research Center, School of Food and Biological Engineering, Hefei University of Technology, Danxia Road 485#, 230601, Hefei City, Anhui Province, People's Republic of China
| | - Dongfeng Guo
- China Tobacco Anhui Industrial Co., Ltd, Huangshan Road 606#, 230088, Hefe City, Anhui Province, People's Republic of China.
| | - Mingzhu Zhang
- Anhui Fermented Food Engineering Research Center, School of Food and Biological Engineering, Hefei University of Technology, Danxia Road 485#, 230601, Hefei City, Anhui Province, People's Republic of China
| | - Guanglong Wu
- Anhui Fermented Food Engineering Research Center, School of Food and Biological Engineering, Hefei University of Technology, Danxia Road 485#, 230601, Hefei City, Anhui Province, People's Republic of China
| | - Yaqi Shi
- China Tobacco Anhui Industrial Co., Ltd, Huangshan Road 606#, 230088, Hefe City, Anhui Province, People's Republic of China
| | - Jinglong Zhou
- China Tobacco Anhui Industrial Co., Ltd, Huangshan Road 606#, 230088, Hefe City, Anhui Province, People's Republic of China
| | - Naihong Ding
- China Tobacco Anhui Industrial Co., Ltd, Huangshan Road 606#, 230088, Hefe City, Anhui Province, People's Republic of China
| | - Xiangsong Chen
- Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei City, 230009, Anhui Province, People's Republic of China
| | - Xingjiang Li
- Anhui Fermented Food Engineering Research Center, School of Food and Biological Engineering, Hefei University of Technology, Danxia Road 485#, 230601, Hefei City, Anhui Province, People's Republic of China.
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4
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Ungor I, Apidianakis Y. Bacterial synergies and antagonisms affecting Pseudomonas aeruginosa virulence in the human lung, skin and intestine. Future Microbiol 2024; 19:141-155. [PMID: 37843410 DOI: 10.2217/fmb-2022-0155] [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: 07/07/2023] [Accepted: 09/12/2023] [Indexed: 10/17/2023] Open
Abstract
Pseudomonas aeruginosa requires a significant breach in the host defense to cause an infection. While its virulence factors are well studied, its tropism cannot be explained only by studying its interaction with the host. Why are P. aeruginosa infections so rare in the intestine compared with the lung and skin? There is not enough evidence to claim specificity in virulence factors deployed by P. aeruginosa in each anatomical site, and host physiology differences between the lung and the intestine cannot easily explain the observed differences in virulence. This perspective highlights a relatively overlooked parameter in P. aeruginosa virulence, namely, potential synergies with bacteria found in the human skin and lung, as well as antagonisms with bacteria of the human intestine.
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Affiliation(s)
- Izel Ungor
- Department of Biological Sciences, University of Cyprus, Nicosia, 2109, Cyprus
| | - Yiorgos Apidianakis
- Department of Biological Sciences, University of Cyprus, Nicosia, 2109, Cyprus
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5
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Souche A, Vandenesch F, Doléans-Jordheim A, Moreau K. How Staphylococcus aureus and Pseudomonas aeruginosa Hijack the Host Immune Response in the Context of Cystic Fibrosis. Int J Mol Sci 2023; 24:ijms24076609. [PMID: 37047579 PMCID: PMC10094765 DOI: 10.3390/ijms24076609] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 03/27/2023] [Accepted: 03/29/2023] [Indexed: 04/05/2023] Open
Abstract
Cystic fibrosis (CF) is a serious genetic disease that leads to premature death, mainly due to impaired lung function. CF lungs are characterized by ongoing inflammation, impaired immune response, and chronic bacterial colonization. Staphylococcus aureus (SA) and Pseudomonas aeruginosa (PA) are the two most predominant bacterial agents of these chronic infections. Both can colonize the lungs for years by developing host adaptation strategies. In this review, we examined the mechanisms by which SA and PA adapt to the host immune response. They are able to bypass the physical integrity of airway epithelia, evade recognition, and then modulate host immune cell proliferation. They also modulate the immune response by regulating cytokine production and by counteracting the activity of neutrophils and other immune cells. Inhibition of the immune response benefits not only the species that implements them but also other species present, and we therefore discuss how these mechanisms can promote the establishment of coinfections in CF lungs.
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Affiliation(s)
- Aubin Souche
- Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, 69007 Lyon, France
- Institut des Agents Infectieux, Hospices Civils de Lyon, 69002 Lyon, France
| | - François Vandenesch
- Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, 69007 Lyon, France
- Institut des Agents Infectieux, Hospices Civils de Lyon, 69002 Lyon, France
| | - Anne Doléans-Jordheim
- Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, 69007 Lyon, France
- Institut des Agents Infectieux, Hospices Civils de Lyon, 69002 Lyon, France
| | - Karen Moreau
- Centre International de Recherche en Infectiologie, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, 69007 Lyon, France
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6
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Halsey G, Sinha D, Dhital S, Wang X, Vyavahare N. Role of elastic fiber degradation in disease pathogenesis. Biochim Biophys Acta Mol Basis Dis 2023; 1869:166706. [PMID: 37001705 DOI: 10.1016/j.bbadis.2023.166706] [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: 10/28/2022] [Revised: 03/22/2023] [Accepted: 03/23/2023] [Indexed: 03/31/2023]
Abstract
Elastin is a crucial extracellular matrix protein that provides structural integrity to tissues. Crosslinked elastin and associated microfibrils, named elastic fiber, contribute to biomechanics by providing the elasticity required for proper function. During aging and disease, elastic fiber can be progressively degraded and since there is little elastin synthesis in adults, degraded elastic fiber is not regenerated. There is substantial evidence linking loss or damage of elastic fibers to the clinical manifestation and pathogenesis of a variety of diseases. Disruption of elastic fiber networks by hereditary mutations, aging, or pathogenic stimuli results in systemic ailments associated with the production of elastin degradation products, inflammatory responses, and abnormal physiology. Due to its longevity, unique mechanical properties, and widespread distribution in the body, elastic fiber plays a central role in homeostasis of various physiological systems. While pathogenesis related to elastic fiber degradation has been more thoroughly studied in elastic fiber rich tissues such as the vasculature and the lungs, even tissues containing relatively small quantities of elastic fibers such as the eyes or joints may be severely impacted by elastin degradation. Elastic fiber degradation is a common observation in certain hereditary, age, and specific risk factor exposure induced diseases representing a converging point of pathological clinical phenotypes which may also help explain the appearance of co-morbidities. In this review, we will first cover the role of elastic fiber degradation in the manifestation of hereditary diseases then individually explore the structural role and degradation effects of elastic fibers in various tissues and organ systems. Overall, stabilizing elastic fiber structures and repairing lost elastin may be effective strategies to reverse the effects of these diseases.
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Affiliation(s)
- Gregory Halsey
- Department of Bioengineering, Clemson University, SC 29634, United States of America
| | - Dipasha Sinha
- Department of Bioengineering, Clemson University, SC 29634, United States of America
| | - Saphala Dhital
- Department of Bioengineering, Clemson University, SC 29634, United States of America
| | - Xiaoying Wang
- Department of Bioengineering, Clemson University, SC 29634, United States of America
| | - Naren Vyavahare
- Department of Bioengineering, Clemson University, SC 29634, United States of America.
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7
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Liao C, Huang X, Wang Q, Yao D, Lu W. Virulence Factors of Pseudomonas Aeruginosa and Antivirulence Strategies to Combat Its Drug Resistance. Front Cell Infect Microbiol 2022; 12:926758. [PMID: 35873152 PMCID: PMC9299443 DOI: 10.3389/fcimb.2022.926758] [Citation(s) in RCA: 87] [Impact Index Per Article: 43.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Accepted: 06/09/2022] [Indexed: 11/24/2022] Open
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen causing nosocomial infections in severely ill and immunocompromised patients. Ubiquitously disseminated in the environment, especially in hospitals, it has become a major threat to human health due to the constant emergence of drug-resistant strains. Multiple resistance mechanisms are exploited by P. aeruginosa, which usually result in chronic infections difficult to eradicate. Diverse virulence factors responsible for bacterial adhesion and colonization, host immune suppression, and immune escape, play important roles in the pathogenic process of P. aeruginosa. As such, antivirulence treatment that aims at reducing virulence while sparing the bacterium for its eventual elimination by the immune system, or combination therapies, has significant advantages over traditional antibiotic therapy, as the former imposes minimal selective pressure on P. aeruginosa, thus less likely to induce drug resistance. In this review, we will discuss the virulence factors of P. aeruginosa, their pathogenic roles, and recent advances in antivirulence drug discovery for the treatment of P. aeruginosa infections.
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Affiliation(s)
- Chongbing Liao
- Key Laboratory of Medical Molecular Virology (Ministry of Education (MOE)/National Health Commission (NHC)/Chinese Academy of Medical Sciences (CAMS)), School of Basic Medical Science, Fudan University, Shanghai, China
| | - Xin Huang
- Key Laboratory of Medical Molecular Virology (Ministry of Education (MOE)/National Health Commission (NHC)/Chinese Academy of Medical Sciences (CAMS)), School of Basic Medical Science, Fudan University, Shanghai, China
| | - Qingxia Wang
- Key Laboratory of Medical Molecular Virology (Ministry of Education (MOE)/National Health Commission (NHC)/Chinese Academy of Medical Sciences (CAMS)), School of Basic Medical Science, Fudan University, Shanghai, China
| | - Dan Yao
- Key Laboratory of Medical Molecular Virology (Ministry of Education (MOE)/National Health Commission (NHC)/Chinese Academy of Medical Sciences (CAMS)), School of Basic Medical Science, Fudan University, Shanghai, China
| | - Wuyuan Lu
- Key Laboratory of Medical Molecular Virology (Ministry of Education (MOE)/National Health Commission (NHC)/Chinese Academy of Medical Sciences (CAMS)), School of Basic Medical Science, Fudan University, Shanghai, China
- Shanghai Institute of Infectious Disease and Biosecurity, School of Public Health, Fudan University, Shanghai, China
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8
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Kaya C, Walter I, Alhayek A, Shafiei R, Jézéquel G, Andreas A, Konstantinović J, Schönauer E, Sikandar A, Haupenthal J, Müller R, Brandstetter H, Hartmann RW, Hirsch AK. Structure-Based Design of α-Substituted Mercaptoacetamides as Inhibitors of the Virulence Factor LasB from Pseudomonas aeruginosa. ACS Infect Dis 2022; 8:1010-1021. [PMID: 35451824 PMCID: PMC9112332 DOI: 10.1021/acsinfecdis.1c00628] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
![]()
Antivirulence therapy
has become a widely applicable method for
fighting infections caused by multidrug-resistant bacteria. Among
the many virulence factors produced by the Gram-negative bacterium Pseudomonas aeruginosa, elastase (LasB) stands out
as an important target as it plays a pivotal role in the invasion
of the host tissue and evasion of the immune response. In this work,
we explored the recently reported LasB inhibitor class of α-benzyl-N-aryl mercaptoacetamides by exploiting the crystal structure
of one of the compounds. Our exploration yielded inhibitors that maintained
inhibitory activity, selectivity, and increased hydrophilicity. These
inhibitors were found to reduce the pathogenicity of the bacteria
and to maintain the integrity of lung and skin cells in the diseased
state. Furthermore, two most promising compounds increased the survival
rate of Galleria mellonella larvae
treated with P. aeruginosa culture
supernatant.
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Affiliation(s)
- Cansu Kaya
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus E8.1, 66123 Saarbrücken, Germany
| | - Isabell Walter
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus E8.1, 66123 Saarbrücken, Germany
| | - Alaa Alhayek
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus E8.1, 66123 Saarbrücken, Germany
| | - Roya Shafiei
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus E8.1, 66123 Saarbrücken, Germany
| | - Gwenaëlle Jézéquel
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
| | - Anastasia Andreas
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus E8.1, 66123 Saarbrücken, Germany
| | - Jelena Konstantinović
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
| | - Esther Schönauer
- Department of Biosciences and Medical Biology, University of Salzburg, Hellbrunner Straße, 34, 5020 Salzburg, Austria
| | - Asfandyar Sikandar
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
| | - Jörg Haupenthal
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
| | - Rolf Müller
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus E8.1, 66123 Saarbrücken, Germany
- Helmholtz International Lab for Anti-Infectives, Campus E 8.1, 66123 Saarbrücken, Germany
| | - Hans Brandstetter
- Department of Biosciences and Medical Biology, University of Salzburg, Hellbrunner Straße, 34, 5020 Salzburg, Austria
| | - Rolf W. Hartmann
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus E8.1, 66123 Saarbrücken, Germany
| | - Anna K.H. Hirsch
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)─Helmholtz Centre for Infection Research (HZI), Campus E8.1, 66123 Saarbrücken, Germany
- Department of Pharmacy, Saarland University, Campus E8.1, 66123 Saarbrücken, Germany
- Helmholtz International Lab for Anti-Infectives, Campus E 8.1, 66123 Saarbrücken, Germany
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Chadha J, Harjai K, Chhibber S. Revisiting the virulence hallmarks of Pseudomonas aeruginosa: a chronicle through the perspective of quorum sensing. Environ Microbiol 2021; 24:2630-2656. [PMID: 34559444 DOI: 10.1111/1462-2920.15784] [Citation(s) in RCA: 76] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 09/16/2021] [Accepted: 09/17/2021] [Indexed: 12/15/2022]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen and the leading cause of mortality among immunocompromised patients in clinical setups. The hallmarks of virulence in P. aeruginosa encompass six biologically competent attributes that cumulatively drive disease progression in a multistep manner. These multifaceted hallmarks lay the principal foundation for rationalizing the complexities of pseudomonal infections. They include factors for host colonization and bacterial motility, biofilm formation, production of destructive enzymes, toxic secondary metabolites, iron-chelating siderophores and toxins. This arsenal of virulence hallmarks is fostered and stringently regulated by the bacterial signalling system called quorum sensing (QS). The central regulatory functions of QS in controlling the timely expression of these virulence hallmarks for adaptation and survival drive the disease outcome. This review describes the intricate mechanisms of QS in P. aeruginosa and its role in shaping bacterial responses, boosting bacterial fitness. We summarize the virulence hallmarks of P. aeruginosa, relating them with the QS circuitry in clinical infections. We also examine the role of QS in the development of drug resistance and propose a novel antivirulence therapy to combat P. aeruginosa infections. This can prove to be a next-generation therapy that may eventually become refractory to the use of conventional antimicrobial treatments.
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Affiliation(s)
- Jatin Chadha
- Department of Microbiology, Panjab University, Chandigarh, India
| | - Kusum Harjai
- Department of Microbiology, Panjab University, Chandigarh, India
| | - Sanjay Chhibber
- Department of Microbiology, Panjab University, Chandigarh, India
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10
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Recombinant Pseudomonas bio-nanoparticles induce protection against pneumonic Pseudomonas aeruginosa infection. Infect Immun 2021; 89:e0039621. [PMID: 34310892 DOI: 10.1128/iai.00396-21] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
To develop an effective Pseudomonas aeruginosa (PA) outer-membrane-vesicles (OMVs) vaccine, we eliminated multiple virulence factors from a wild-type P. aeruginosa PA103 strain (PA103) to generate a recombinant strain, PA-m14. The PA-m14 strain was tailored with a pSMV83 plasmid encoding the pcrV-hitAT fusion gene to produce OMVs. The recombinant OMVs enclosed increased amounts of PcrV-HitAT bivalent antigen (PH) (termed OMV-PH) and exhibited reduced toxicity compared to the OMVs from PA103. Intramuscular vaccination with OMV-PH from PA-m14(pSMV83) afforded 70% protection against intranasal challenge with 6.5 × 106 CFU (∼30 LD50) of PA103, while immunization using OMVs without the PH antigen (termed OMV-NA) or the PH antigen alone failed to offer effective protection against the same challenge. Further immune analysis showed that the OMV-PH immunization significantly stimulated potent antigen-specific humoral and T-cell (Th1/Th17) responses in comparison to the PH or OMV-NA immunization in mice, which can effectively hinder PA infection. Undiluted anti-sera from OMV-PH-immunized mice displayed significant opsonophagocytic killing of WT PA103 compared to antisera from PH antigen- or OMV-NA-immunized mice. Moreover, the OMV-PH immunization afforded significant antibody-indentpednet cross-protection to mice against PAO1 and a clinical isolate AMC-PA10 strains. Collectively, the recombinant PA OMV delivering the PH bivalent antigen exhibits high immunogenicity and would be a promising next-generation vaccine candidate against PA infection.
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11
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Kuang Z, Bennett RC, Lin J, Hao Y, Zhu L, Akinbi HT, Lau GW. Surfactant phospholipids act as molecular switches for premature induction of quorum sensing-dependent virulence in Pseudomonas aeruginosa. Virulence 2021; 11:1090-1107. [PMID: 32842850 PMCID: PMC7549932 DOI: 10.1080/21505594.2020.1809327] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The virulence behaviors of many Gram-negative bacterial pathogens are governed by quorum-sensing (QS), a hierarchical system of gene regulation that relies on population density by producing and detecting extracellular signaling molecules. Although extensively studied under in vitro conditions, adaptation of QS system to physiologically relevant host environment is not fully understood. In this study, we investigated the influence of lung environment on the regulation of Pseudomonas aeruginosa virulence factors by QS in a mouse model of acute pneumonia. When cultured under laboratory conditions in lysogeny broth, wild-type P. aeruginosa strain PAO1 began to express QS-regulated virulence factors elastase B (LasB) and rhamnolipids (RhlA) during transition from late-exponential into stationary growth phase. In contrast, during acute pneumonia as well as when cultured in mouse bronchial alveolar lavage fluids (BALF), exponential phase PAO1 bacteria at low population density prematurely expressed QS regulatory genes lasI-lasR and rhlI-rhlR and their downstream virulence genes lasB and rhlA. Further analysis indicated that surfactant phospholipids were the primary components within BALF that induced the synthesis of N-(3-oxododecanoyl)-L-homoserine lactone (C12-HSL), which triggered premature expression of LasB and RhlA. Both phenol extraction and phospholipase A2 digestion abolished the ability of mouse BALF to promote LasB and RhlA expression. In contrast, provision of the major surfactant phospholipid dipalmitoylphosphatidylcholine (DPPC) restored the expression of both virulence factors. Collectively, our study demonstrates P. aeruginosa modulates its QS to coordinate the expression of virulence factors during acute pneumonia by recognizing pulmonary surfactant phospholipids.
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Affiliation(s)
- Zhizhou Kuang
- Department of Pathobiology, University of Illinois at Urbana-Champaign , Urbana, IL, USA
| | - Richard C Bennett
- Department of Pathobiology, University of Illinois at Urbana-Champaign , Urbana, IL, USA
| | - Jingjun Lin
- Department of Pathobiology, University of Illinois at Urbana-Champaign , Urbana, IL, USA
| | - Yonghua Hao
- Department of Pathobiology, University of Illinois at Urbana-Champaign , Urbana, IL, USA
| | - Luchang Zhu
- Department of Pathobiology, University of Illinois at Urbana-Champaign , Urbana, IL, USA
| | - Henry T Akinbi
- Division of Pulmonary Medicine, Cincinnati Children Hospital , Cincinnati, OH, USA
| | - Gee W Lau
- Department of Pathobiology, University of Illinois at Urbana-Champaign , Urbana, IL, USA
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Santajit S, Kong-ngoen T, Chongsa-Nguan M, Boonyuen U, Pumirat P, Sookrung N, Chaicumpa W, Indrawattana N. Human Single-Chain Antibodies That Neutralize Elastolytic Activity of Pseudomonas aeruginosa LasB. Pathogens 2021; 10:765. [PMID: 34204417 PMCID: PMC8234315 DOI: 10.3390/pathogens10060765] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/12/2021] [Accepted: 06/15/2021] [Indexed: 12/28/2022] Open
Abstract
LasB (elastase/pseudolysin) is an injurious zinc-metalloprotease secreted by the infecting Pseudomonas aeruginosa. LasB is recognized as the bacterial key virulence factor for establishment of successful infection, acquisition of nutrients, dissemination, tissue invasion, and immune modulation and evasion. LasB digests a variety of the host tissue proteins, extracellular matrices, as well as components of both innate and adaptive immune systems, including immunoglobulins, complement proteins, and cytokines. Thus, this enzyme is an attractive target for disarming the P. aeruginosa. This study generated human single-chain antibodies (HuscFvs) that can neutralize the elastolytic activity of native LasB by using phage display technology. Gene sequences coding HuscFvs (huscfvs) isolated from HuscFv-displaying phage clones that bound to enzymatically active LasB were sub-cloned to expression plasmids for large scale production of the recombinant HuscFvs by the huscfv-plasmid transformed Escherichia coli. HuscFvs of two transformed E. coli clones, i.e., HuscFv-N42 and HuscFv-N45, neutralized the LasB elastolytic activities in vitro. Computer simulation by homology modeling and molecular docking demonstrated that antibodies presumptively formed contact interfaces with the LasB residues critical for the catalytic activity. Although the LasB neutralizing mechanisms await elucidation by laboratory experiments, the HuscFvs should be tested further towards the clinical application as a novel adjunctive therapeutics to mitigate severity of the diseases caused by P. aeruginosa.
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Affiliation(s)
- Sirijan Santajit
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (S.S.); (T.K.-n.); (P.P.)
- Department of Medical Technology, School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat 80160, Thailand
| | - Thida Kong-ngoen
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (S.S.); (T.K.-n.); (P.P.)
| | - Manas Chongsa-Nguan
- Faculty of Public Health and Environment, Pathumthani University, Pathum Thani 12000, Thailand;
| | - Usa Boonyuen
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand;
| | - Pornpan Pumirat
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (S.S.); (T.K.-n.); (P.P.)
| | - Nitat Sookrung
- Center of Research Excellence on Therapeutic Proteins and Antibody Engineering, Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand; (N.S.); (W.C.)
- Biomedical Research Incubator Unit, Department of Research, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
| | - Wanpen Chaicumpa
- Center of Research Excellence on Therapeutic Proteins and Antibody Engineering, Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand; (N.S.); (W.C.)
| | - Nitaya Indrawattana
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (S.S.); (T.K.-n.); (P.P.)
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Marchioni A, Tonelli R, Cerri S, Castaniere I, Andrisani D, Gozzi F, Bruzzi G, Manicardi L, Moretti A, Demurtas J, Baroncini S, Andreani A, Cappiello GF, Busani S, Fantini R, Tabbì L, Samarelli AV, Clini E. Pulmonary Stretch and Lung Mechanotransduction: Implications for Progression in the Fibrotic Lung. Int J Mol Sci 2021; 22:ijms22126443. [PMID: 34208586 PMCID: PMC8234308 DOI: 10.3390/ijms22126443] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 06/11/2021] [Accepted: 06/12/2021] [Indexed: 12/18/2022] Open
Abstract
Lung fibrosis results from the synergic interplay between regenerative deficits of the alveolar epithelium and dysregulated mechanisms of repair in response to alveolar and vascular damage, which is followed by progressive fibroblast and myofibroblast proliferation and excessive deposition of the extracellular matrix. The increased parenchymal stiffness of fibrotic lungs significantly affects respiratory mechanics, making the lung more fragile and prone to non-physiological stress during spontaneous breathing and mechanical ventilation. Given their parenchymal inhomogeneity, fibrotic lungs may display an anisotropic response to mechanical stresses with different regional deformations (micro-strain). This behavior is not described by the standard stress–strain curve but follows the mechano-elastic models of “squishy balls”, where the elastic limit can be reached due to the excessive deformation of parenchymal areas with normal elasticity that are surrounded by inelastic fibrous tissue or collapsed induration areas, which tend to protrude outside the fibrous ring. Increasing evidence has shown that non-physiological mechanical forces applied to fibrotic lungs with associated abnormal mechanotransduction could favor the progression of pulmonary fibrosis. With this review, we aim to summarize the state of the art on the relation between mechanical forces acting on the lung and biological response in pulmonary fibrosis, with a focus on the progression of damage in the fibrotic lung during spontaneous breathing and assisted ventilatory support.
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Affiliation(s)
- Alessandro Marchioni
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Roberto Tonelli
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
- Clinical and Experimental Medicine PhD Program, University of Modena Reggio Emilia, 41125 Modena, Italy
- Correspondence:
| | - Stefania Cerri
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Ivana Castaniere
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Dario Andrisani
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
- Clinical and Experimental Medicine PhD Program, University of Modena Reggio Emilia, 41125 Modena, Italy
| | - Filippo Gozzi
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
- Clinical and Experimental Medicine PhD Program, University of Modena Reggio Emilia, 41125 Modena, Italy
| | - Giulia Bruzzi
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Linda Manicardi
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Antonio Moretti
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Jacopo Demurtas
- Primary Care Department USL Toscana Sud Est-Grosseto, 58100 Grosseto, Italy;
| | - Serena Baroncini
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Alessandro Andreani
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Gaia Francesca Cappiello
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Stefano Busani
- University Hospital of Modena, Anesthesiology Unit, University of Modena Reggio Emilia, 41124 Modena, Italy;
| | - Riccardo Fantini
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Luca Tabbì
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Anna Valeria Samarelli
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
| | - Enrico Clini
- Laboratory of Cell Therapies and Respiratory Medicine, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, 41125 Modena, Italy; (A.M.); (S.C.); (I.C.); (D.A.); (F.G.); (G.B.); (L.M.); (A.M.); (A.V.S.); (E.C.)
- University Hospital of Modena, Respiratory Diseases Unit, Department of Medical and Surgical Sciences, University of Modena Reggio Emilia, 41125 Modena, Italy; (S.B.); (A.A.); (G.F.C.); (R.F.); (L.T.)
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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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15
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Pielesz A, Fabia J, Biniaś W, Fryczkowski R, Fryczkowska B, Gawłowski A, Machnicka A, Bobiński R, Laane HM, Waksmańska W. Graphene Oxide and Stabilized Ortho-Silicic Acid as Modifiers of Amnion and Burn Affected Skin: A Comparative Study. Nanotechnol Sci Appl 2021; 14:49-67. [PMID: 33727805 PMCID: PMC7955732 DOI: 10.2147/nsa.s294412] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 02/03/2021] [Indexed: 11/23/2022] Open
Abstract
Introduction Oxidative tissue damage caused by reactive oxygen species results in a significant decrease in the total antioxidant capacity of the biological system. The aim of this interdisciplinary study was to answer the question of whether active antioxidants modify, at a molecular and supramolecular level, the tissue of pathological amnion and the necrotic eschar degraded in thermal burn. Methods A Nicolet 6700 Fourier-transform spectrophotometer with OMNIC software and the EasiDiff diffusion accessory were used in the FTIR spectroscopic analysis. A NICOLET MAGNA-IR 860 spectrometer with FT-Raman accessory was used to record the Raman spectra of the samples. The samples were exposed to bacteria capable of causing nosocomial infections, ie Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli and Pseudomonas aeruginosa. Whereas samples of hypotrophic amnion interacted with Staphylococcus aureus, Escherichia coli and Enterococcus faecalis. The obtained flame retardant effect of placentas was evaluated using the method of the limiting oxygen index (LOI). Results The infrared spectroscopy analysis proved that after modification of the amniotic samples in graphene oxide and ortho-silicic acid, the amide II band is split into two components. Incubation of samples in modifier solutions: graphene oxide, sodium ascorbate and L-ascorbic acid results in shifts and changes of intensity within the broadly understood lipid band 1743–1745–1747 cm−1. The oxidising changes observed within the lipid and amide bands are affected by the incubation effect of graphene oxide as a modifier, possibly adsorbing on the surface of the amniotic membrane. On the basis of microbiological studies, pathogenic bacteria commonly causing amniotic infections and growing in burn wounds were found to have particularly good resistance to stabilized ortho-silicic acid (E. coli) and lactoferrin (S.aureus). Conclusion This thermogravimetric study found the highest stability of the analysed tissues (hypotrophic amnion and burnt epidermis) after modification with graphene oxide and sodium ascorbate.
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Affiliation(s)
- Anna Pielesz
- Faculty of Materials, Civil and Environmental Engineering, University of Bielsko-Biala, Bielsko-Biala, Poland
| | - Janusz Fabia
- Faculty of Materials, Civil and Environmental Engineering, University of Bielsko-Biala, Bielsko-Biala, Poland
| | - Włodzimierz Biniaś
- Faculty of Materials, Civil and Environmental Engineering, University of Bielsko-Biala, Bielsko-Biala, Poland
| | - Ryszard Fryczkowski
- Faculty of Materials, Civil and Environmental Engineering, University of Bielsko-Biala, Bielsko-Biala, Poland
| | - Beata Fryczkowska
- Faculty of Materials, Civil and Environmental Engineering, University of Bielsko-Biala, Bielsko-Biala, Poland
| | - Andrzej Gawłowski
- Faculty of Materials, Civil and Environmental Engineering, University of Bielsko-Biala, Bielsko-Biala, Poland
| | - Alicja Machnicka
- Department of Microbiology and Environmental Technology, Institute of Engineering and Environmental Protection, University of Bielsko-Biała, Bielsko-Biala, Poland
| | - Rafał Bobiński
- Faculty of Health Sciences, Department of Biochemistry and Molecular Biology, University of Bielsko-Biala, Bielsko-Biala, Poland
| | | | - Wioletta Waksmańska
- Faculty of Health Sciences, Department of Public Health, University of Bielsko-Biala, Bielsko-Biala, Poland
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Jurado-Martín I, Sainz-Mejías M, McClean S. Pseudomonas aeruginosa: An Audacious Pathogen with an Adaptable Arsenal of Virulence Factors. Int J Mol Sci 2021; 22:3128. [PMID: 33803907 PMCID: PMC8003266 DOI: 10.3390/ijms22063128] [Citation(s) in RCA: 243] [Impact Index Per Article: 81.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/16/2021] [Accepted: 03/16/2021] [Indexed: 12/13/2022] Open
Abstract
Pseudomonas aeruginosa is a dominant pathogen in people with cystic fibrosis (CF) contributing to morbidity and mortality. Its tremendous ability to adapt greatly facilitates its capacity to cause chronic infections. The adaptability and flexibility of the pathogen are afforded by the extensive number of virulence factors it has at its disposal, providing P. aeruginosa with the facility to tailor its response against the different stressors in the environment. A deep understanding of these virulence mechanisms is crucial for the design of therapeutic strategies and vaccines against this multi-resistant pathogen. Therefore, this review describes the main virulence factors of P. aeruginosa and the adaptations it undergoes to persist in hostile environments such as the CF respiratory tract. The very large P. aeruginosa genome (5 to 7 MB) contributes considerably to its adaptive capacity; consequently, genomic studies have provided significant insights into elucidating P. aeruginosa evolution and its interactions with the host throughout the course of infection.
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Affiliation(s)
| | | | - Siobhán McClean
- School of Biomolecular and Biomedical Sciences, University College Dublin, Belfield, Dublin 4 D04 V1W8, Ireland; (I.J.-M.); (M.S.-M.)
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Ahmed SAKS, Rudden M, Elias SM, Smyth TJ, Marchant R, Banat IM, Dooley JSG. Pseudomonas aeruginosa PA80 is a cystic fibrosis isolate deficient in RhlRI quorum sensing. Sci Rep 2021; 11:5729. [PMID: 33707533 PMCID: PMC7970962 DOI: 10.1038/s41598-021-85100-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 02/08/2021] [Indexed: 11/10/2022] Open
Abstract
Pseudomonas aeruginosa uses quorum sensing (QS) to modulate the expression of several virulence factors that enable it to establish severe infections. The QS system in P. aeruginosa is complex, intricate and is dominated by two main N-acyl-homoserine lactone circuits, LasRI and RhlRI. These two QS systems work in a hierarchical fashion with LasRI at the top, directly regulating RhlRI. Together these QS circuits regulate several virulence associated genes, metabolites, and enzymes in P. aeruginosa. Paradoxically, LasR mutants are frequently isolated from chronic P. aeruginosa infections, typically among cystic fibrosis (CF) patients. This suggests P. aeruginosa can undergo significant evolutionary pathoadaptation to persist in long term chronic infections. In contrast, mutations in the RhlRI system are less common. Here, we have isolated a clinical strain of P. aeruginosa from a CF patient that has deleted the transcriptional regulator RhlR entirely. Whole genome sequencing shows the rhlR locus is deleted in PA80 alongside a few non-synonymous mutations in virulence factors including protease lasA and rhamnolipid rhlA, rhlB, rhlC. Importantly we did not observe any mutations in the LasRI QS system. PA80 does not appear to have an accumulation of mutations typically associated with several hallmark pathoadaptive genes (i.e., mexT, mucA, algR, rpoN, exsS, ampR). Whole genome comparisons show that P. aeruginosa strain PA80 is closely related to the hypervirulent Liverpool epidemic strain (LES) LESB58. PA80 also contains several genomic islands (GI’s) encoding virulence and/or resistance determinants homologous to LESB58. To further understand the effect of these mutations in PA80 QS regulatory and virulence associated genes, we compared transcriptional expression of genes and phenotypic effects with isogenic mutants in the genetic reference strain PAO1. In PAO1, we show that deletion of rhlR has a much more significant impact on the expression of a wide range of virulence associated factors rather than deletion of lasR. In PA80, no QS regulatory genes were expressed, which we attribute to the inactivation of the RhlRI QS system by deletion of rhlR and mutation of rhlI. This study demonstrates that inactivation of the LasRI system does not impact RhlRI regulated virulence factors. PA80 has bypassed the common pathoadaptive mutations observed in LasR by targeting the RhlRI system. This suggests that RhlRI is a significant target for the long-term persistence of P. aeruginosa in chronic CF patients. This raises important questions in targeting QS systems for therapeutic interventions.
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Affiliation(s)
- Syed A K Shifat Ahmed
- School of Environment and Life Sciences, Independent University, Bangladesh (IUB), Dhaka, Bangladesh
| | - Michelle Rudden
- Department of Biology, University of York, Wentworth, York, YO10 5DD, UK
| | - Sabrina M Elias
- School of Environment and Life Sciences, Independent University, Bangladesh (IUB), Dhaka, Bangladesh
| | - Thomas J Smyth
- School of Science, Institute of Technology Sligo, Sligo, Ireland
| | - Roger Marchant
- School of Biomedical Sciences, Ulster University, Coleraine, UK
| | - Ibrahim M Banat
- School of Biomedical Sciences, Ulster University, Coleraine, UK
| | - James S G Dooley
- School of Biomedical Sciences, Ulster University, Coleraine, UK.
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Margalit A, Carolan JC, Kavanagh K. Bacterial Interactions with Aspergillus fumigatus in the Immunocompromised Lung. Microorganisms 2021; 9:microorganisms9020435. [PMID: 33669831 PMCID: PMC7923216 DOI: 10.3390/microorganisms9020435] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 02/18/2021] [Accepted: 02/18/2021] [Indexed: 12/13/2022] Open
Abstract
The immunocompromised airways are susceptible to infections caused by a range of pathogens which increases the opportunity for polymicrobial interactions to occur. Pseudomonas aeruginosa and Staphylococcus aureus are the predominant causes of pulmonary infection for individuals with respiratory disorders such as cystic fibrosis (CF). The spore-forming fungus Aspergillus fumigatus, is most frequently isolated with P. aeruginosa, and co-infection results in poor outcomes for patients. It is therefore clinically important to understand how these pathogens interact with each other and how such interactions may contribute to disease progression so that appropriate therapeutic strategies may be developed. Despite its persistence in the airways throughout the life of a patient, A. fumigatus rarely becomes the dominant pathogen. In vitro interaction studies have revealed remarkable insights into the molecular mechanisms that drive agonistic and antagonistic interactions that occur between A. fumigatus and pulmonary bacterial pathogens such as P. aeruginosa. Crucially, these studies demonstrate that although bacteria may predominate in a competitive environment, A. fumigatus has the capacity to persist and contribute to disease.
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Affiliation(s)
| | | | - Kevin Kavanagh
- Correspondence: ; Tel.: +353-1-708-3859; Fax: +353-1-708-3845
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Nugteren S, Samsom JN. Secretory Leukocyte Protease Inhibitor (SLPI) in mucosal tissues: Protects against inflammation, but promotes cancer. Cytokine Growth Factor Rev 2021; 59:22-35. [PMID: 33602652 DOI: 10.1016/j.cytogfr.2021.01.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Accepted: 01/24/2021] [Indexed: 12/20/2022]
Abstract
The immune system is continuously challenged with large quantities of exogenous antigens at the barriers between the external environment and internal human tissues. Antimicrobial activity is essential at these sites, though the immune responses must be tightly regulated to prevent tissue destruction by inflammation. Secretory Leukocyte Protease Inhibitor (SLPI) is an evolutionarily conserved, pleiotropic protein expressed at mucosal surfaces, mainly by epithelial cells. SLPI inhibits proteases, exerts antimicrobial activity and inhibits nuclear factor-kappa B (NF-κB)-mediated inflammatory gene transcription. SLPI maintains homeostasis at barrier tissues by preventing tissue destruction and regulating the threshold of inflammatory immune responses, while protecting the host from infection. However, excessive expression of SLPI in cancer cells may have detrimental consequences, as recent studies demonstrate that overexpression of SLPI increases the metastatic potential of epithelial tumors. Here, we review the varied functions of SLPI in the respiratory tract, skin, gastrointestinal tract and genitourinary tract, and then discuss the mechanisms by which SLPI may contribute to cancer.
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Affiliation(s)
- Sandrine Nugteren
- Laboratory of Pediatrics, Division Gastroenterology and Nutrition, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Janneke N Samsom
- Laboratory of Pediatrics, Division Gastroenterology and Nutrition, Erasmus University Medical Center, Rotterdam, the Netherlands.
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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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21
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Fleiszig SMJ, Kroken AR, Nieto V, Grosser MR, Wan SJ, Metruccio MME, Evans DJ. Contact lens-related corneal infection: Intrinsic resistance and its compromise. Prog Retin Eye Res 2019; 76:100804. [PMID: 31756497 DOI: 10.1016/j.preteyeres.2019.100804] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 11/05/2019] [Accepted: 11/12/2019] [Indexed: 12/20/2022]
Abstract
Contact lenses represent a widely utilized form of vision correction with more than 140 million wearers worldwide. Although generally well-tolerated, contact lenses can cause corneal infection (microbial keratitis), with an approximate annualized incidence ranging from ~2 to ~20 cases per 10,000 wearers, and sometimes resulting in permanent vision loss. Research suggests that the pathogenesis of contact lens-associated microbial keratitis is complex and multifactorial, likely requiring multiple conspiring factors that compromise the intrinsic resistance of a healthy cornea to infection. Here, we outline our perspective of the mechanisms by which contact lens wear sometimes renders the cornea susceptible to infection, focusing primarily on our own research efforts during the past three decades. This has included studies of host factors underlying the constitutive barrier function of the healthy cornea, its response to bacterial challenge when intrinsic resistance is not compromised, pathogen virulence mechanisms, and the effects of contact lens wear that alter the outcome of host-microbe interactions. For almost all of this work, we have utilized the bacterium Pseudomonas aeruginosa because it is the leading cause of lens-related microbial keratitis. While not yet common among corneal isolates, clinical isolates of P. aeruginosa have emerged that are resistant to virtually all currently available antibiotics, leading the United States CDC (Centers for Disease Control) to add P. aeruginosa to its list of most serious threats. Compounding this concern, the development of advanced contact lenses for biosensing and augmented reality, together with the escalating incidence of myopia, could portent an epidemic of vision-threatening corneal infections in the future. Thankfully, technological advances in genomics, proteomics, metabolomics and imaging combined with emerging models of contact lens-associated P. aeruginosa infection hold promise for solving the problem - and possibly life-threatening infections impacting other tissues.
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Affiliation(s)
- Suzanne M J Fleiszig
- School of Optometry, University of California, Berkeley, CA, USA; Graduate Group in Vision Science, University of California, Berkeley, CA, USA; Graduate Groups in Microbiology and Infectious Diseases & Immunity, University of California, Berkeley, CA, USA.
| | - Abby R Kroken
- School of Optometry, University of California, Berkeley, CA, USA
| | - Vincent Nieto
- School of Optometry, University of California, Berkeley, CA, USA
| | | | - Stephanie J Wan
- Graduate Group in Vision Science, University of California, Berkeley, CA, USA
| | | | - David J Evans
- School of Optometry, University of California, Berkeley, CA, USA; College of Pharmacy, Touro University California, Vallejo, CA, USA
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22
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Neuhaus M, Munder A, Schipke J, Schmiedl A. Lung infection caused by Pseudomonas aeruginosa in a CD26/DPP4 deficient F344 rat model. Inflamm Res 2019; 68:529-544. [PMID: 31089745 PMCID: PMC7079754 DOI: 10.1007/s00011-019-01236-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 03/27/2019] [Accepted: 04/16/2019] [Indexed: 01/21/2023] Open
Abstract
Background Pseudomonas aeruginosa (PA) is the most important opportunistic pathogen in causing nosocomial infections and, furthermore, poses a permanent threat for severe chronic infections in patients with cystic fibrosis or COPD. The transmembrane protein CD26 with dipeptidyl peptidase-4 (DPP4) activity shows an increased expression in inflamed tissue. We tested whether CD26/DPP4 deficiency leads to reduced inflammation and decreased structural damage when infected with PA. Methods CD26/DPP4+ and CD26/DPP4− rats were instilled intratracheally with NaCl (controls) or with PA. Six hours later, bacterial distribution was detected with the in vivo imaging system 200 (IVIS). Lungs were then processed for molecular biology, light and electron microscopy and analyzed qualitatively, quantitatively and stereologically. Bacterial numbers were determined in homogenized lungs. Results Compared to saline treated controls, in both infected groups (1) the acinar airspace was significantly increased, (2) the volume density of the alveolar epithelium was significantly decreased, (3) the septal thickness was significantly reduced, (4) more than 40% of the alveolar epithelial surface was damaged, and up to 36% of the epithelial surface was covered with edema. In infected CD26− rats, the increase in lung weight was significantly less pronounced, the portion of edematous alveolar airspace was significantly lower and the part of edema interspersed with PA was decreased significantly. Conclusions CD26/DPP4 deficiency resulted in reduced pulmonary edema under sublethal PA infection, implicating a role for CD26 in infection progression. The partly pronounced structural damage may mask further possible influences of CD26 on the inflammatory response.
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Affiliation(s)
- M Neuhaus
- Institute of Functional and Applied Anatomy, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany.,Department of Oral and Maxillofacial Surgery, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - A Munder
- Clinic of Pediatric Pneumology, Allergology and Neonatology Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany.,Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Hannover Medical School, Hannover, Germany
| | - J Schipke
- Institute of Functional and Applied Anatomy, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany.,Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Hannover Medical School, Hannover, Germany.,REBIRTH Cluster of Excellence, Hannover Medical School, Hannover, Germany
| | - A Schmiedl
- Institute of Functional and Applied Anatomy, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany. .,Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Hannover Medical School, Hannover, Germany. .,REBIRTH Cluster of Excellence, Hannover Medical School, Hannover, Germany.
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Li J, Ramezanpour M, Fong SA, Cooksley C, Murphy J, Suzuki M, Psaltis AJ, Wormald PJ, Vreugde S. Pseudomonas aeruginosa Exoprotein-Induced Barrier Disruption Correlates With Elastase Activity and Marks Chronic Rhinosinusitis Severity. Front Cell Infect Microbiol 2019; 9:38. [PMID: 30873390 PMCID: PMC6400838 DOI: 10.3389/fcimb.2019.00038] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 02/07/2019] [Indexed: 01/01/2023] Open
Abstract
Background:Pseudomonas aeruginosa causes severe chronic respiratory diseases and is associated with recalcitrant chronic rhinosinusitis (CRS). P. aeruginosa exoproteins contain virulence factors and play important roles in the pathogenicity of P. aeruginosa, however their role in CRS pathophysiology remains unknown. Methods: We isolated P. aeruginosa clinical isolates (CIs) and obtained clinical information from 21 CRS patients. Elastase activity of the CIs was measured at different phases of growth. Primary human nasal epithelial cells (HNECs) were cultured at air-liquid interface (ALI) and challenged with P. aeruginosa exoproteins or purified elastase, followed by measuring Transepithelial Electrical Resistance (TEER), permeability of FITC-dextrans, western blot, and immunofluorescence. Results: 14/21 CIs had a significant increase in elastase activity in stationary phase of growth. There was a highly significant strong correlation between the in vitro elastase activity of P. aeruginosa CIs with mucosal barrier disruption evidenced by increased permeability of FITC-dextrans (r = 0.95, p = 0.0004) and decreased TEER (r = −0.9333, P < 0.01) after 4 h of challenge. Western blot showed a significant degradation of ZO-1, Occludin and β-actin in relation to the elastase activity of the exoproteins. There was a highly significant correlation between the in vitro elastase activity of P. aeruginosa CIs and CRS disease severity (for log phase, r = 0.5631, p = 0.0097; for stationary phase, r = 0.66, p = 0.0013) assessed by CT imaging of the paranasal sinuses. Conclusion: Our results implicate P. aeruginosa exoproteins as playing a major role in the pathophysiology of P. aeruginosa associated CRS by severely compromising mucosal barrier structure and function.
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Affiliation(s)
- Jian Li
- Department of Otolaryngology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology, Guangzhou, China.,Department of Surgery-Otolaryngology Head and Neck Surgery, University of Adelaide, Adelaide, SA, Australia
| | - Mahnaz Ramezanpour
- Department of Surgery-Otolaryngology Head and Neck Surgery, University of Adelaide, Adelaide, SA, Australia
| | - Stephanie A Fong
- Department of Surgery-Otolaryngology Head and Neck Surgery, University of Adelaide, Adelaide, SA, Australia
| | - Clare Cooksley
- Department of Surgery-Otolaryngology Head and Neck Surgery, University of Adelaide, Adelaide, SA, Australia
| | - Jae Murphy
- Department of Surgery-Otolaryngology Head and Neck Surgery, University of Adelaide, Adelaide, SA, Australia
| | - Masanobu Suzuki
- Department of Surgery-Otolaryngology Head and Neck Surgery, University of Adelaide, Adelaide, SA, Australia.,Department of Otolaryngology-Head and Neck Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Alkis J Psaltis
- Department of Surgery-Otolaryngology Head and Neck Surgery, University of Adelaide, Adelaide, SA, Australia
| | - Peter John Wormald
- Department of Surgery-Otolaryngology Head and Neck Surgery, University of Adelaide, Adelaide, SA, Australia
| | - Sarah Vreugde
- Department of Surgery-Otolaryngology Head and Neck Surgery, University of Adelaide, Adelaide, SA, Australia
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Liew SM, Rajasekaram G, Puthucheary SA, Chua KH. Antimicrobial susceptibility and virulence genes of clinical and environmental isolates of Pseudomonas aeruginosa. PeerJ 2019; 7:e6217. [PMID: 30697478 PMCID: PMC6346980 DOI: 10.7717/peerj.6217] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 12/05/2018] [Indexed: 01/03/2023] Open
Abstract
Background Pseudomonas aeruginosa is ubiquitous, has intrinsic antibiotic resistance mechanisms, and is associated with serious hospital-associated infections. It has evolved from being a burn wound infection into a major nosocomial threat. In this study, we compared and correlated the antimicrobial resistance, virulence traits and clonal relatedness between clinical and fresh water environmental isolates of P. aeruginosa. Methods 219 P. aeruginosa isolates were studied: (a) 105 clinical isolates from 1977 to 1985 (n = 52) and 2015 (n = 53), and (b) 114 environmental isolates from different fresh water sources. All isolates were subjected to ERIC-PCR typing, antimicrobial susceptibility testing and virulence factor genes screening. Results Clinical and environmental isolates of P. aeruginosa were genetically heterogenous, with only four clinical isolates showing 100% identical ERIC-PCR patterns to seven environmental isolates. Most of the clinical and environmental isolates were sensitive to almost all of the antipseudomonal drugs, except for ticarcillin/clavulanic acid. Increased resistant isolates was seen in 2015 compared to that of the archived isolates; four MDR strains were detected and all were retrieved in 2015. All clinical isolates retrieved from 1977 to 1985 were susceptible to ceftazidime and ciprofloxacin; but in comparison, the clinical isolates recovered in 2015 exhibited 9.4% resistance to ceftazidime and 5.7% to ciprofloxacin; a rise in resistance to imipenem (3.8% to 7.5%), piperacillin (9.6% to 11.3%) and amikacin (1.9% to 5.7%) and a slight drop in resistance rates to piperacillin/tazobactam (7.7% to 7.5%), ticarcillin/clavulanic acid (19.2% to 18.9%), meropenem (15.4% to 7.5%), doripenem (11.5% to 7.5%), gentamicin (7.7% to 7.5%) and netilmicin (7.7% to 7.5%). Environmental isolates were resistant to piperacillin/tazobactam (1.8%), ciprofloxacin (1.8%), piperacillin (4.4%) and carbapenems (doripenem 11.4%, meropenem 8.8% and imipenem 2.6%). Both clinical and environmental isolates showed high prevalence of virulence factor genes, but none were detected in 10 (9.5%) clinical and 18 (15.8%) environmental isolates. The exoT gene was not detected in any of the clinical isolates. Resistance to carbapenems (meropenem, doripenem and imipenem), β-lactamase inhibitors (ticarcillin/clavulanic acid and piperacillin/tazobactam), piperacillin, ceftazidime and ciprofloxacin was observed in some of the isolates without virulence factor genes. Five virulence-negative isolates were susceptible to all of the antimicrobials. Only one MDR strain harbored none of the virulence factor genes. Conclusion Over a period of 30 years, a rise in antipseudomonal drug resistance particularly to ceftazidime and ciprofloxacin was observed in two hospitals in Malaysia. The occurrence of resistant environmental isolates from densely populated areas is relevant and gives rise to collective anxiety to the community at large.
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Affiliation(s)
- Siew Mun Liew
- Department of Biomedical Science, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | | | - Sd Ampalam Puthucheary
- Department of Biomedical Science, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Kek Heng Chua
- Department of Biomedical Science, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
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Bastaert F, Kheir S, Saint-Criq V, Villeret B, Dang PMC, El-Benna J, Sirard JC, Voulhoux R, Sallenave JM. Pseudomonas aeruginosa LasB Subverts Alveolar Macrophage Activity by Interfering With Bacterial Killing Through Downregulation of Innate Immune Defense, Reactive Oxygen Species Generation, and Complement Activation. Front Immunol 2018; 9:1675. [PMID: 30083156 PMCID: PMC6064941 DOI: 10.3389/fimmu.2018.01675] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Accepted: 07/06/2018] [Indexed: 12/25/2022] Open
Abstract
Pseudomonas aeruginosa (P.a) is a pathogen causing significant morbidity and mortality, in particular, in hospital patients undergoing ventilation and in patients with cystic fibrosis. Among the virulence factors secreted or injected into host cells, the physiopathological relevance of type II secretions system (T2SS) is less studied. Although there is extensive literature on the destructive role of LasB in vitro on secreted innate immune components and on some stromal cell receptors, studies on its direct action on myeloid cells are scant. Using a variety of methods, including the use of bacterial mutants, gene-targeted mice, and proteomics technology, we show here, using non-opsonic conditions (thus mimicking resting and naïve conditions in the alveolar space), that LasB, an important component of the P.a T2SS is highly virulent in vivo, and can subvert alveolar macrophage (AM) activity and bacterial killing, in vitro and in vivo by downregulating important secreted innate immune molecules (complement factors, cytokines, etc.) and receptors (IFNAR, Csf1r, etc.). In particular, we show that LasB downregulates the production of C3 and factor B complement molecules, as well as the activation of reactive oxygen species production by AM. In addition, we showed that purified LasB impaired significantly the ability of AM to clear an unrelated bacterium, namely Streptococcus pneumoniae. These data provide a new mechanism of action for LasB, potentially partly explaining the early onset of P.a, alone, or with other bacteria, within the alveolar lumen in susceptible individuals, such as ventilated, chronic obstructive pulmonary disease and cystic fibrosis patients.
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Affiliation(s)
- Fabien Bastaert
- INSERM, UMR1152, Paris, France.,Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), University Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Saadé Kheir
- INSERM, UMR1152, Paris, France.,Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), University Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Vinciane Saint-Criq
- INSERM, UMR1152, Paris, France.,Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), University Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Bérengère Villeret
- INSERM, UMR1152, Paris, France.,Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), University Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Pham My-Chan Dang
- INSERM UMR1149, ERL 8252 CNRS, Centre de Recherche sur l'Inflammation, Paris, France.,Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Excellence Inflamex, Faculté de Médecine, Site Xavier Bichat, Paris, France
| | - Jamel El-Benna
- INSERM UMR1149, ERL 8252 CNRS, Centre de Recherche sur l'Inflammation, Paris, France.,Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d'Excellence Inflamex, Faculté de Médecine, Site Xavier Bichat, Paris, France
| | - Jean-Claude Sirard
- Centre d'Infection et d'Immunité de Lille, Institut Pasteur de Lille, INSERM, U1019, Lille, CNRS, UMR 8204, Université de Lille, Lille, France
| | - Romé Voulhoux
- CNRS & Aix-Marseille Université, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Institut de Microbiologie de la Méditerranée (IMM), Marseille, France
| | - Jean-Michel Sallenave
- INSERM, UMR1152, Paris, France.,Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), University Paris Diderot, Sorbonne Paris Cité, Paris, France
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Stoeckelhuber M, Feuerhake F, Schmitz C, Wolff KD, Kesting MR. Immunolocalization of Surfactant Proteins SP-A, SP-B, SP-C, and SP-D in Infantile Labial Glands and Mucosa. J Histochem Cytochem 2018; 66:531-538. [PMID: 29601229 PMCID: PMC6055263 DOI: 10.1369/0022155418766063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 02/16/2018] [Indexed: 11/22/2022] Open
Abstract
Surfactant proteins in different glandular structures of the oral cavity display antimicrobial activity for protection of invading microorganisms. Moreover, they are involved in lowering liquid tension in fluids and facilitate secretion flows. Numerous investigations for studying the occurrence of surfactant proteins in glandular tissues were performed using different methods. In the oral cavity, minor salivary glands secrete saliva continuously for the maintenance of a healthy oral environment. For the first time, we could show that infantile labial glands show expression of the surfactant proteins (SP) SP-A, SP-B, SP-C, and SP-D in acinar cells and the duct system in different intensities. The stratified squamous epithelium of the oral mucosa revealed positive staining for SPs in various cell layers.
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Affiliation(s)
- Mechthild Stoeckelhuber
- Department of Oral and Maxillofacial Surgery, Technical University of Munich, Munich, Germany
| | - Friedrich Feuerhake
- Department of Neuropathology, Institute of Pathology, Hannover Medical School, Hannover, Germany
| | - Christoph Schmitz
- Chair of Neuroanatomy, Institute of Anatomy, Faculty of Medicine, Ludwig Maximilians University of Munich, Munich, Germany
| | - Klaus-Dietrich Wolff
- Department of Oral and Maxillofacial Surgery, Technical University of Munich, Munich, Germany
| | - Marco R. Kesting
- Department of Oral and Maxillofacial Surgery, Technical University of Munich, Munich, Germany
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27
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Kany AM, Sikandar A, Haupenthal J, Yahiaoui S, Maurer CK, Proschak E, Köhnke J, Hartmann RW. Binding Mode Characterization and Early in Vivo Evaluation of Fragment-Like Thiols as Inhibitors of the Virulence Factor LasB from Pseudomonas aeruginosa. ACS Infect Dis 2018; 4:988-997. [PMID: 29485268 DOI: 10.1021/acsinfecdis.8b00010] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The increasing emergence of antibiotic resistance necessitates the development of anti-infectives with novel modes of action. Targeting bacterial virulence is considered a promising approach to develop novel antibiotics with reduced selection pressure. The extracellular collagenase elastase (LasB) plays a pivotal role in the infection process of Pseudomonas aeruginosa and therefore represents an attractive antivirulence target. Mercaptoacetamide-based thiols have been reported to inhibit LasB as well as collagenases from clostridia and bacillus species. The present work provides an insight into the structure-activity relationship (SAR) of these fragment-like LasB inhibitors, demonstrating an inverse activity profile compared to similar inhibitors of clostridial collagenase H (ColH). An X-ray cocrystal structure is presented, revealing distinct binding of two compounds to the active site of LasB, which unexpectedly maintains an open conformation. We further demonstrate in vivo efficacy in a Galleria mellonella infection model and high selectivity of the LasB inhibitors toward human matrix metalloproteinases (MMPs).
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Affiliation(s)
- Andreas M. Kany
- Department of Drug Design and Optimization, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus E8.1, 66123, Saarbrücken, Germany
| | - Asfandyar Sikandar
- Workgroup Structural Biology of Biosynthetic Enzymes, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus E8.1, 66123, Saarbrücken, Germany
| | - Jörg Haupenthal
- Department of Drug Design and Optimization, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus E8.1, 66123, Saarbrücken, Germany
| | - Samir Yahiaoui
- Department of Drug Design and Optimization, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus E8.1, 66123, Saarbrücken, Germany
| | - Christine K. Maurer
- Department of Drug Design and Optimization, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus E8.1, 66123, Saarbrücken, Germany
| | - Ewgenij Proschak
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Straße 9, 60438, Frankfurt, Germany
| | - Jesko Köhnke
- Workgroup Structural Biology of Biosynthetic Enzymes, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus E8.1, 66123, Saarbrücken, Germany
| | - Rolf W. Hartmann
- Department of Drug Design and Optimization, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus E8.1, 66123, Saarbrücken, Germany
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry, Saarland University, Campus E8.1, 66123, Saarbrücken, Germany
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28
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Curran CS, Bolig T, Torabi-Parizi P. Mechanisms and Targeted Therapies for Pseudomonas aeruginosa Lung Infection. Am J Respir Crit Care Med 2018; 197:708-727. [PMID: 29087211 PMCID: PMC5855068 DOI: 10.1164/rccm.201705-1043so] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 10/26/2017] [Indexed: 12/12/2022] Open
Abstract
Pseudomonas aeruginosa is a complex gram-negative facultative anaerobe replete with a variety of arsenals to activate, modify, and destroy host defense mechanisms. The microbe is a common cause of nosocomial infections and an antibiotic-resistant priority pathogen. In the lung, P. aeruginosa disrupts upper and lower airway homeostasis by damaging the epithelium and evading innate and adaptive immune responses. The biology of these interactions is essential to understand P. aeruginosa pathogenesis. P. aeruginosa interacts directly with host cells via flagella, pili, lipoproteins, lipopolysaccharides, and the type III secretion system localized in the outer membrane. P. aeruginosa quorum-sensing molecules regulate the release of soluble factors that enhance the spread of infection. These characteristics of P. aeruginosa differentially affect lung epithelial, innate, and adaptive immune cells involved in the production of mediators and the recruitment of additional immune cell subsets. Pathogen interactions with individual host cells and in the context of host acute lung infection are discussed to reveal pathways that may be targeted therapeutically.
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Affiliation(s)
- Colleen S Curran
- Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, Maryland
| | - Thomas Bolig
- Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, Maryland
| | - Parizad Torabi-Parizi
- Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, Maryland
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Sorensen GL. Surfactant Protein D in Respiratory and Non-Respiratory Diseases. Front Med (Lausanne) 2018; 5:18. [PMID: 29473039 PMCID: PMC5809447 DOI: 10.3389/fmed.2018.00018] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 01/19/2018] [Indexed: 12/16/2022] Open
Abstract
Surfactant protein D (SP-D) is a multimeric collectin that is involved in innate immune defense and expressed in pulmonary, as well as non-pulmonary, epithelia. SP-D exerts antimicrobial effects and dampens inflammation through direct microbial interactions and modulation of host cell responses via a series of cellular receptors. However, low protein concentrations, genetic variation, biochemical modification, and proteolytic breakdown can induce decomposition of multimeric SP-D into low-molecular weight forms, which may induce pro-inflammatory SP-D signaling. Multimeric SP-D can decompose into trimeric SP-D, and this process, and total SP-D levels, are partly determined by variation within the SP-D gene, SFTPD. SP-D has been implicated in the development of respiratory diseases including respiratory distress syndrome, bronchopulmonary dysplasia, allergic asthma, and chronic obstructive pulmonary disease. Disease-induced breakdown or modifications of SP-D facilitate its systemic leakage from the lung, and circulatory SP-D is a promising biomarker for lung injury. Moreover, studies in preclinical animal models have demonstrated that local pulmonary treatment with recombinant SP-D is beneficial in these diseases. In recent years, SP-D has been shown to exert antimicrobial and anti-inflammatory effects in various non-pulmonary organs and to have effects on lipid metabolism and pro-inflammatory effects in vessel walls, which enhance the risk of atherosclerosis. A common SFTPD polymorphism is associated with atherosclerosis and diabetes, and SP-D has been associated with metabolic disorders because of its effects in the endothelium and adipocytes and its obesity-dampening properties. This review summarizes and discusses the reported genetic associations of SP-D with disease and the clinical utility of circulating SP-D for respiratory disease prognosis. Moreover, basic research on the mechanistic links between SP-D and respiratory, cardiovascular, and metabolic diseases is summarized. Perspectives on the development of SP-D therapy are addressed.
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Affiliation(s)
- Grith L Sorensen
- Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
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Reijnen G, Buster M, Vos P, Reijnders U. External foam and the post-mortem period in freshwater drowning; results from a retrospective study in Amsterdam, the Netherlands. J Forensic Leg Med 2017; 52:1-4. [DOI: 10.1016/j.jflm.2017.07.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 07/08/2017] [Accepted: 07/24/2017] [Indexed: 11/17/2022]
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Abstract
Proteases play an important role in health and disease of the lung. In the normal lungs, proteases maintain their homeostatic functions that regulate processes like its regeneration and repair. Dysregulation of proteases–antiproteases balance is crucial in the manifestation of different types of lung diseases. Chronic inflammatory lung pathologies are associated with a marked increase in protease activities. Thus, in addition to protease activities, inhibition of anti-proteolytic control mechanisms are also important for effective microbial infection and inflammation in the lung. Herein, we briefly summarize the role of different proteases and to some extent antiproteases in regulating a variety of lung diseases.
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Esculentin-1a-Derived Peptides Promote Clearance of Pseudomonas aeruginosa Internalized in Bronchial Cells of Cystic Fibrosis Patients and Lung Cell Migration: Biochemical Properties and a Plausible Mode of Action. Antimicrob Agents Chemother 2016; 60:7252-7262. [PMID: 27671059 DOI: 10.1128/aac.00904-16] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 09/16/2016] [Indexed: 01/17/2023] Open
Abstract
Pseudomonas aeruginosa is the major microorganism colonizing the respiratory epithelium in cystic fibrosis (CF) sufferers. The widespread use of available antibiotics has drastically reduced their efficacy, and antimicrobial peptides (AMPs) are a promising alternative. Among them, the frog skin-derived AMPs, i.e., Esc(1-21) and its diastereomer, Esc(1-21)-1c, have recently shown potent activity against free-living and sessile forms of P. aeruginosa Importantly, this pathogen also escapes antibiotics treatment by invading airway epithelial cells. Here, we demonstrate that both AMPs kill Pseudomonas once internalized into bronchial cells which express either the functional or the ΔF508 mutant of the CF transmembrane conductance regulator. A higher efficacy is displayed by Esc(1-21)-1c (90% killing at 15 μM in 1 h). We also show the peptides' ability to stimulate migration of these cells and restore the induction of cell migration that is inhibited by Pseudomonas lipopolysaccharide when used at concentrations mimicking lung infection. This property of AMPs was not investigated before. Our findings suggest new therapeutics that not only eliminate bacteria but also can promote reepithelialization of the injured infected tissue. Confocal microscopy indicated that both peptides are intracellularly localized with a different distribution. Biochemical analyses highlighted that Esc(1-21)-1c is significantly more resistant than the all-l peptide to bacterial and human elastase, which is abundant in CF lungs. Besides proposing a plausible mechanism underlying the properties of the two AMPs, we discuss the data with regard to differences between them and suggest Esc(1-21)-1c as a candidate for the development of a new multifunctional drug against Pseudomonas respiratory infections.
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Huber P, Basso P, Reboud E, Attrée I. Pseudomonas aeruginosa renews its virulence factors. ENVIRONMENTAL MICROBIOLOGY REPORTS 2016; 8:564-571. [PMID: 27428387 DOI: 10.1111/1758-2229.12443] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 07/13/2016] [Indexed: 06/06/2023]
Abstract
Highly divergent strains of the major human opportunistic pathogen Pseudomonas aeruginosa have been isolated around the world by different research laboratories. They came from patients with various types of infectious diseases or from the environment. These strains are devoid of the major virulence factor used by classical strains, the Type III secretion system, but possess additional putative virulence factors, including a novel two-partner secretion system, ExlBA, responsible for the hypervirulent behavior of some clinical isolates. Here, we review the genetic and phenotypic characteristics of these recently-discovered P. aeruginosa outliers.
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Affiliation(s)
- Philippe Huber
- University of Grenoble Alpes, Grenoble 38000, France
- CNRS, ERL5261, Grenoble 38000, France
- CEA, BIG-BCI, Grenoble, 38000, France
- INSERM, U1036, Grenoble, 38000, France
| | - Pauline Basso
- University of Grenoble Alpes, Grenoble 38000, France
- CNRS, ERL5261, Grenoble 38000, France
- CEA, BIG-BCI, Grenoble, 38000, France
- INSERM, U1036, Grenoble, 38000, France
| | - Emeline Reboud
- University of Grenoble Alpes, Grenoble 38000, France
- CNRS, ERL5261, Grenoble 38000, France
- CEA, BIG-BCI, Grenoble, 38000, France
- INSERM, U1036, Grenoble, 38000, France
| | - Ina Attrée
- University of Grenoble Alpes, Grenoble 38000, France
- CNRS, ERL5261, Grenoble 38000, France
- CEA, BIG-BCI, Grenoble, 38000, France
- INSERM, U1036, Grenoble, 38000, France
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Moran AP, Khamri W, Walker MM, Thursz MR. Role of surfactant protein D (SP-D) in innate immunity in the gastric mucosa: evidence of interaction with Helicobacter pylori lipopolysaccharide. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519050110061101] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Surfactant protein D (SP-D) is a collagenous glycoprotein, a collectin, which functions as a pathogen-associated molecular pattern (PAMP) recognition receptor in the innate immune response. Although originally identified in the lung as a component of surfactant, SP-D also occurs in the gastric mucosa at the luminal surface and within gastric pits of mucus-secreting cells. Infection with the gastroduodenal pathogen Helicobacter pylori up-regulates expression of SP-D in human patients with gastritis, and its influence on colonization has been demonstrated in a Helicobacter SP-D-deficient (SP-D—/ —) mouse model. SP-D binds and agglutinates H. pylori cells in a lectin-specific manner, and has been shown to bind H. pylori lipopolysaccharide. Furthermore, evidence indicates that H. pylori varies LPS O-chain structure to evade SP-D binding which is speculated aids persistence of this chronic infection.
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Affiliation(s)
- Anthony P. Moran
- Department of Microbiology, National University of Ireland, Galway, Ireland,
| | - Wafa Khamri
- Faculty of Medicine, Imperial College, St Mary's Campus, London, UK
| | | | - Mark R. Thursz
- Faculty of Medicine, Imperial College, St Mary's Campus, London, UK
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Lund-Palau H, Turnbull AR, Bush A, Bardin E, Cameron L, Soren O, Wierre-Gore N, Alton EWFW, Bundy JG, Connett G, Faust SN, Filloux A, Freemont P, Jones A, Khoo V, Morales S, Murphy R, Pabary R, Simbo A, Schelenz S, Takats Z, Webb J, Williams HD, Davies JC. Pseudomonas aeruginosa infection in cystic fibrosis: pathophysiological mechanisms and therapeutic approaches. Expert Rev Respir Med 2016; 10:685-97. [PMID: 27175979 DOI: 10.1080/17476348.2016.1177460] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Pseudomonas aeruginosa is a remarkably versatile environmental bacterium with an extraordinary capacity to infect the cystic fibrosis (CF) lung. Infection with P. aeruginosa occurs early, and although eradication can be achieved following early detection, chronic infection occurs in over 60% of adults with CF. Chronic infection is associated with accelerated disease progression and increased mortality. Extensive research has revealed complex mechanisms by which P. aeruginosa adapts to and persists within the CF airway. Yet knowledge gaps remain, and prevention and treatment strategies are limited by the lack of sensitive detection methods and by a narrow armoury of antibiotics. Further developments in this field are urgently needed in order to improve morbidity and mortality in people with CF. Here, we summarize current knowledge of pathophysiological mechanisms underlying P. aeruginosa infection in CF. Established treatments are discussed, and an overview is offered of novel detection methods and therapeutic strategies in development.
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Affiliation(s)
- Helena Lund-Palau
- a Department of Gene Therapy, National Heart and Lung Institute , Imperial College , London , UK
| | - Andrew R Turnbull
- a Department of Gene Therapy, National Heart and Lung Institute , Imperial College , London , UK.,b Department of Respiratory Paediatrics , Royal Brompton and Harefield NHS Foundation Trust , London , UK
| | - Andrew Bush
- b Department of Respiratory Paediatrics , Royal Brompton and Harefield NHS Foundation Trust , London , UK.,c National Heart and Lung Institute, Imperial College , London , UK
| | - Emmanuelle Bardin
- d Biomolecular Medicine, Department of Surgery and Cancer, Faculty of Medicine , Imperial College , London , UK
| | - Loren Cameron
- e Department of Medicine , Imperial College , London , UK
| | - Odel Soren
- f Biological Sciences, Institute for Life Sciences , University of Southampton , Southampton , UK
| | | | - Eric W F W Alton
- a Department of Gene Therapy, National Heart and Lung Institute , Imperial College , London , UK
| | - Jacob G Bundy
- c National Heart and Lung Institute, Imperial College , London , UK
| | - Gary Connett
- g NIHR Wellcome Trust Clinical Research Facility, University Hospital Southampton NHS Foundation Trust , University of Southampton , Southampton , UK
| | - Saul N Faust
- g NIHR Wellcome Trust Clinical Research Facility, University Hospital Southampton NHS Foundation Trust , University of Southampton , Southampton , UK
| | - Alain Filloux
- h Department of Life Sciences , Imperial College , London , UK
| | - Paul Freemont
- e Department of Medicine , Imperial College , London , UK
| | - Andy Jones
- i Department of Respiratory Medicine , Royal Brompton Hospital , London , UK
| | - Valerie Khoo
- c National Heart and Lung Institute, Imperial College , London , UK
| | | | - Ronan Murphy
- a Department of Gene Therapy, National Heart and Lung Institute , Imperial College , London , UK
| | - Rishi Pabary
- a Department of Gene Therapy, National Heart and Lung Institute , Imperial College , London , UK
| | - Ameze Simbo
- a Department of Gene Therapy, National Heart and Lung Institute , Imperial College , London , UK
| | - Silke Schelenz
- k Department of Microbiology , Royal Brompton Hospital , London UK
| | - Zoltan Takats
- d Biomolecular Medicine, Department of Surgery and Cancer, Faculty of Medicine , Imperial College , London , UK
| | - Jeremy Webb
- k Department of Microbiology , Royal Brompton Hospital , London UK
| | - Huw D Williams
- g NIHR Wellcome Trust Clinical Research Facility, University Hospital Southampton NHS Foundation Trust , University of Southampton , Southampton , UK
| | - Jane C Davies
- a Department of Gene Therapy, National Heart and Lung Institute , Imperial College , London , UK.,b Department of Respiratory Paediatrics , Royal Brompton and Harefield NHS Foundation Trust , London , UK
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Abstract
Pulmonary surfactant is essential for life as it lines the alveoli to lower surface tension, thereby preventing atelectasis during breathing. Surfactant is enriched with a relatively unique phospholipid, termed dipalmitoylphosphatidylcholine, and four surfactant-associated proteins, SP-A, SP-B, SP-C, and SP-D. The hydrophobic proteins, SP-B and SP-C, together with dipalmitoylphosphatidylcholine, confer surface tension-lowering properties to the material. The more hydrophilic surfactant components, SP-A and SP-D, participate in pulmonary host defense and modify immune responses. Specifically, SP-A and SP-D bind and partake in the clearance of a variety of bacterial, fungal, and viral pathogens and can dampen antigen-induced immune function of effector cells. Emerging data also show immunosuppressive actions of some surfactant-associated lipids, such as phosphatidylglycerol. Conversely, microbial pathogens in preclinical models impair surfactant synthesis and secretion, and microbial proteinases degrade surfactant-associated proteins. Deficiencies of surfactant components are classically observed in the neonatal respiratory distress syndrome, where surfactant replacement therapies have been the mainstay of treatment. However, functional or compositional deficiencies of surfactant are also observed in a variety of acute and chronic lung disorders. Increased surfactant is seen in pulmonary alveolar proteinosis, a disorder characterized by a functional deficiency of the granulocyte-macrophage colony-stimulating factor receptor or development of granulocyte-macrophage colony-stimulating factor antibodies. Genetic polymorphisms of some surfactant proteins such as SP-C are linked to interstitial pulmonary fibrosis. Here, we briefly review the composition, antimicrobial properties, and relevance of pulmonary surfactant to lung disorders and present its therapeutic implications.
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Aybey A, Demirkan E. Inhibition of quorum sensing-controlled virulence factors in Pseudomonas aeruginosa by human serum paraoxonase. J Med Microbiol 2016; 65:105-113. [DOI: 10.1099/jmm.0.000206] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Affiliation(s)
- Aynur Aybey
- Department of Biology, Faculty of Arts and Science, Uludag University, 16059, Bursa, Turkey
| | - Elif Demirkan
- Department of Biology, Faculty of Arts and Science, Uludag University, 16059, Bursa, Turkey
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LaFayette SL, Houle D, Beaudoin T, Wojewodka G, Radzioch D, Hoffman LR, Burns JL, Dandekar AA, Smalley NE, Chandler JR, Zlosnik JE, Speert DP, Bernier J, Matouk E, Brochiero E, Rousseau S, Nguyen D. Cystic fibrosis-adapted Pseudomonas aeruginosa quorum sensing lasR mutants cause hyperinflammatory responses. SCIENCE ADVANCES 2015; 1:e1500199. [PMID: 26457326 PMCID: PMC4597794 DOI: 10.1126/sciadv.1500199] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 06/06/2015] [Indexed: 05/23/2023]
Abstract
Cystic fibrosis lung disease is characterized by chronic airway infections with the opportunistic pathogen Pseudomonas aeruginosa and severe neutrophilic pulmonary inflammation. P. aeruginosa undergoes extensive genetic adaptation to the cystic fibrosis (CF) lung environment, and adaptive mutations in the quorum sensing regulator gene lasR commonly arise. We sought to define how mutations in lasR alter host-pathogen relationships. We demonstrate that lasR mutants induce exaggerated host inflammatory responses in respiratory epithelial cells, with increased accumulation of proinflammatory cytokines and neutrophil recruitment due to the loss of bacterial protease- dependent cytokine degradation. In subacute pulmonary infections, lasR mutant-infected mice show greater neutrophilic inflammation and immunopathology compared with wild-type infections. Finally, we observed that CF patients infected with lasR mutants have increased plasma interleukin-8 (IL-8), a marker of inflammation. These findings suggest that bacterial adaptive changes may worsen pulmonary inflammation and directly contribute to the pathogenesis and progression of chronic lung disease in CF patients.
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Affiliation(s)
- Shantelle L. LaFayette
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Daniel Houle
- Department of Medicine, Research Institute of the McGill University Health Centre, Montreal, Quebec H4A 3J1, Canada
| | - Trevor Beaudoin
- Department of Medicine, Research Institute of the McGill University Health Centre, Montreal, Quebec H4A 3J1, Canada
| | - Gabriella Wojewodka
- Department of Medicine, Research Institute of the McGill University Health Centre, Montreal, Quebec H4A 3J1, Canada
| | - Danuta Radzioch
- Department of Medicine, Research Institute of the McGill University Health Centre, Montreal, Quebec H4A 3J1, Canada
| | - Lucas R. Hoffman
- Department of Microbiology, University of Washington, Seattle, WA 98195, USA
- Department of Pediatrics, University of Washington, Seattle, WA 98195, USA
| | - Jane L. Burns
- Department of Pediatrics, University of Washington, Seattle, WA 98195, USA
| | - Ajai A. Dandekar
- Department of Microbiology, University of Washington, Seattle, WA 98195, USA
| | - Nicole E. Smalley
- Department of Microbiology, University of Washington, Seattle, WA 98195, USA
| | | | - James E. Zlosnik
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - David P. Speert
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Joanie Bernier
- McGill University Health Centre, Montreal, Quebec H4A 3J1, Canada
| | - Elias Matouk
- McGill University Health Centre, Montreal, Quebec H4A 3J1, Canada
| | - Emmanuelle Brochiero
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, Canada
| | - Simon Rousseau
- Department of Medicine, Research Institute of the McGill University Health Centre, Montreal, Quebec H4A 3J1, Canada
| | - Dao Nguyen
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec H3A 2B4, Canada
- Department of Medicine, Research Institute of the McGill University Health Centre, Montreal, Quebec H4A 3J1, Canada
- McGill University Health Centre, Montreal, Quebec H4A 3J1, Canada
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Zhu J, Cai X, Harris TL, Gooyit M, Wood M, Lardy M, Janda KD. Disarming Pseudomonas aeruginosa virulence factor LasB by leveraging a Caenorhabditis elegans infection model. ACTA ACUST UNITED AC 2015; 22:483-491. [PMID: 25892201 DOI: 10.1016/j.chembiol.2015.03.012] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 02/18/2015] [Accepted: 03/02/2015] [Indexed: 10/23/2022]
Abstract
The emergence of antibiotic resistance places a sense of urgency on the development of alternative antibacterial strategies, of which targeting virulence factors has been regarded as a "second generation" antibiotic approach. In the case of Pseudomonas aeruginosa infections, a proteolytic virulence factor, LasB, is one such target. Unfortunately, we and others have not been successful in translating in vitro potency of LasB inhibitors to in vivo efficacy in an animal model. To overcome this obstacle, we now integrate in silico and in vitro identification of the mercaptoacetamide motif as an effective class of LasB inhibitors with full in vivo characterization of mercaptoacetamide prodrugs using Caenorhabditis elegans. We show that one of our mercaptoacetamide prodrugs has a good selectivity profile and high in vivo efficacy, and confirm that LasB is a promising target for the treatment of bacterial infections. In addition, our work highlights that the C. elegans infection model is a user-friendly and cost-effective translational tool for the development of anti-virulence compounds.
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Affiliation(s)
- Jie Zhu
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), La Jolla, CA 92037, USA
| | - Xiaoqing Cai
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), La Jolla, CA 92037, USA
| | - Tyler L Harris
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), La Jolla, CA 92037, USA
| | - Major Gooyit
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), La Jolla, CA 92037, USA
| | - Malcolm Wood
- The Core Microscopy Facility, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Matthew Lardy
- Computational Chemistry, Principia Biopharma, 400 East Jamie Court, South San Francisco, CA 94080, USA
| | - Kim D Janda
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), La Jolla, CA 92037, USA.
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Ledford JG, Addison KJ, Foster MW, Que LG. Eosinophil-associated lung diseases. A cry for surfactant proteins A and D help? Am J Respir Cell Mol Biol 2015; 51:604-14. [PMID: 24960334 DOI: 10.1165/rcmb.2014-0095tr] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Surfactant proteins (SP)-A and SP-D (SP-A/-D) play important roles in numerous eosinophil-dominated diseases, including asthma, allergic bronchopulmonary aspergillosis, and allergic rhinitis. In these settings, SP-A/-D have been shown to modulate eosinophil chemotaxis, inhibit eosinophil mediator release, and mediate macrophage clearance of apoptotic eosinophils. Dysregulation of SP-A/-D function in eosinophil-dominated diseases is also not uncommon. Alterations in serum SP-A/-D levels are associated with disease severity in allergic rhinitis and chronic obstructive pulmonary disease. Furthermore, oligimerization of SP-A/-D, necessary for their proper function, can be perturbed by reactive nitrogen species, which are increased in eosinophilic disease. In this review, we highlight the associations of eosinophilic lung diseases with SP-A and SP-D levels and functions.
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Affiliation(s)
- Julie G Ledford
- 1 Department of Medicine, Division of Pulmonary, Allergy and Critical Care, and
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Kim CJ, Lee DI, Lee CH, Ahn IS. Dityrosine-based substrates for the selective and sensitive assay of thermolysin. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2014.02.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Adekoya OA, Sjøli S, Wuxiuer Y, Bilto I, Marques SM, Santos MA, Nuti E, Cercignani G, Rossello A, Winberg JO, Sylte I. Inhibition of pseudolysin and thermolysin by hydroxamate-based MMP inhibitors. Eur J Med Chem 2014; 89:340-8. [PMID: 25462250 DOI: 10.1016/j.ejmech.2014.10.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 09/30/2014] [Accepted: 10/04/2014] [Indexed: 11/24/2022]
Abstract
In the present study, we have investigated the inhibition of thermolysin and pseudolysin by a series of compounds previously identified as matrix metalloproteinase (MMP) inhibitors using experimental binding studies and theoretical calculations. The experimental studies showed that some of the compounds were able to inhibit thermolysin and pseudolysin in the low μM range. The studies revealed that, in general, the compounds bound in the order MMPs > pseudolysin > thermolysin, and the strongest pseudolysin and thermolysin binders were compounds 8-12. Furthermore, compounds 8 and 9 were unique in that they bound much stronger to the two bacterial enzymes than to the MMPs. The docking calculations suggested that the phenyl group of the strongest binders (compounds 8 and 9) occupy the S2(')-subpocket, while a second ring system occupy the S1-subpocket in both thermolysin and pseudolysin. When the compounds possess two ring systems, the largest and most electron rich ring system seems to occupy the S1-subpocket.
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Affiliation(s)
- Olayiwola A Adekoya
- Department of Pharmacy, Faculty of Health Sciences, UiT - The Arctic University of Norway, NO-9037 Tromsø, Norway.
| | - Stian Sjøli
- Department of Medical Biology, Faculty of Health Sciences, UiT - The Arctic University of Norway, NO-9037 Tromsø, Norway
| | - Yimingjiang Wuxiuer
- Department of Medical Biology, Faculty of Health Sciences, UiT - The Arctic University of Norway, NO-9037 Tromsø, Norway
| | - Irina Bilto
- Department of Pharmacy, Faculty of Health Sciences, UiT - The Arctic University of Norway, NO-9037 Tromsø, Norway
| | - Sérgio M Marques
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - M Amélia Santos
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - Elisa Nuti
- Dipartimento di Farmacia, Università di Pisa, Via Bonanno 6, 56126 Pisa, Italy
| | - Giovanni Cercignani
- Dipartimento di Biologia, Unità di Biochimica, Università di Pisa, Via San Zeno 51, 56127 Pisa, Italy
| | - Armando Rossello
- Dipartimento di Farmacia, Università di Pisa, Via Bonanno 6, 56126 Pisa, Italy
| | - Jan-Olof Winberg
- Department of Medical Biology, Faculty of Health Sciences, UiT - The Arctic University of Norway, NO-9037 Tromsø, Norway
| | - Ingebrigt Sylte
- Department of Medical Biology, Faculty of Health Sciences, UiT - The Arctic University of Norway, NO-9037 Tromsø, Norway.
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Jovic S, Shikhagaie M, Mörgelin M, Kjellström S, Erjefalt J, Olin AI, Frick IM, Egesten A. Expression of MIG/CXCL9 in cystic fibrosis and modulation of its activities by elastase of Pseudomonas aeruginosa. J Innate Immun 2014; 6:846-59. [PMID: 25115612 DOI: 10.1159/000365399] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 06/22/2014] [Indexed: 12/20/2022] Open
Abstract
In cystic fibrosis (CF), colonization of the airways with Pseudomonas aeruginosa is associated with disease deterioration. The mechanism behind the disease progression is not fully understood. The present work shows that the antibacterial chemokine MIG/CXCL9 is present in the airways and in sputum of CF patients. MIG/CXCL9 showed high bactericidal activity against. P. aeruginosa, including some strains from the airways of CF patients. Full-length MIG/CXCL9 was detected in sputum from healthy controls and CF patients colonized with P. aeruginosa. However, degraded MIG/CXCL9 was only found in CF sputum. In vitro, elastase of P. aeruginosa cleaved off a fragment of similar size and two additional fragments from MIG/CXCL9. The fragments showed less bactericidal activity against P. aeruginosa compared with the full-length protein. The fragments did not activate the MIG/CXCL9 receptor CXCR3 (expressed e.g. by NK cells, mast cells, and activated T cells) but instead displayed noncompetitive inhibition. In vitro, a decrease in CXCR3-bearing cells was found within and in the proximity of the bronchial epithelium of CF lung tissue compared with controls. Taken together, both bactericidal and cell-recruiting activities of MIG/CXCL9 are corrupted by P. aeruginosa through release of elastase, and this may contribute to impaired airway host defense in CF.
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Affiliation(s)
- Sandra Jovic
- Sections for Respiratory Medicine and Allergology, Department of Clinical Sciences, Lund University, Lund, Sweden
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Golovkine G, Faudry E, Bouillot S, Voulhoux R, Attrée I, Huber P. VE-cadherin cleavage by LasB protease from Pseudomonas aeruginosa facilitates type III secretion system toxicity in endothelial cells. PLoS Pathog 2014; 10:e1003939. [PMID: 24626230 PMCID: PMC3953407 DOI: 10.1371/journal.ppat.1003939] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Accepted: 01/06/2014] [Indexed: 01/01/2023] Open
Abstract
Infection of the vascular system by Pseudomonas aeruginosa (Pa) occurs during bacterial dissemination in the body or in blood-borne infections. Type 3 secretion system (T3SS) toxins from Pa induce a massive retraction when injected into endothelial cells. Here, we addressed the role of type 2 secretion system (T2SS) effectors in this process. Mutants with an inactive T2SS were much less effective than wild-type strains at inducing cell retraction. Furthermore, secretomes from wild-types were sufficient to trigger cell-cell junction opening when applied to cells, while T2SS-inactivated mutants had minimal activity. Intoxication was associated with decreased levels of vascular endothelial (VE)-cadherin, a homophilic adhesive protein located at endothelial cell-cell junctions. During the process, the protein was cleaved in the middle of its extracellular domain (positions 335 and 349). VE-cadherin attrition was T3SS-independent but T2SS-dependent. Interestingly, the epithelial (E)-cadherin was unaffected by T2SS effectors, indicating that this mechanism is specific to endothelial cells. We showed that one of the T2SS effectors, the protease LasB, directly affected VE-cadherin proteolysis, hence promoting cell-cell junction disruption. Furthermore, mouse infection with Pa to induce acute pneumonia lead to significant decreases in lung VE-cadherin levels, whereas the decrease was minimal with T2SS-inactivated or LasB-deleted mutant strains. We conclude that the T2SS plays a pivotal role during Pa infection of the vascular system by breaching the endothelial barrier, and propose a model in which the T2SS and the T3SS cooperate to intoxicate endothelial cells.
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Affiliation(s)
- Guillaume Golovkine
- INSERM, U1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- Université Joseph Fourier-Grenoble I, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
| | - Eric Faudry
- INSERM, U1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- Université Joseph Fourier-Grenoble I, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
| | - Stéphanie Bouillot
- INSERM, U1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- Université Joseph Fourier-Grenoble I, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
| | - Romé Voulhoux
- CNRS and Aix-Marseille Univ, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Marseille, France
| | - Ina Attrée
- INSERM, U1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- Université Joseph Fourier-Grenoble I, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
| | - Philippe Huber
- INSERM, U1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- Université Joseph Fourier-Grenoble I, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
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Andrejko M, Zdybicka-Barabas A, Cytryńska M. Diverse effects of Galleria mellonella infection with entomopathogenic and clinical strains of Pseudomonas aeruginosa. J Invertebr Pathol 2014; 115:14-25. [DOI: 10.1016/j.jip.2013.10.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 09/25/2013] [Accepted: 10/13/2013] [Indexed: 02/06/2023]
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Nordin SL, Jovic S, Kurut A, Andersson C, Gela A, Bjartell A, Mörgelin M, Olin AI, Lund M, Egesten A. High Expression of Midkine in the Airways of Patients with Cystic Fibrosis. Am J Respir Cell Mol Biol 2013; 49:935-42. [DOI: 10.1165/rcmb.2013-0106oc] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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dos Santos MHB, da Costa AFE, Ferreira BJ, Souza SL, da Silva Lannes P, Santos GS, Mattos-Guaraldi AL, Nagao PE. A phosphoramidon-sensitive metalloprotease induces apoptosis of human endothelial cells by Group B Streptococcus. Antonie van Leeuwenhoek 2013; 104:1125-33. [DOI: 10.1007/s10482-013-0034-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 09/06/2013] [Indexed: 11/24/2022]
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Lecaille F, Naudin C, Sage J, Joulin-Giet A, Courty A, Andrault PM, Veldhuizen RA, Possmayer F, Lalmanach G. Specific cleavage of the lung surfactant protein A by human cathepsin S may impair its antibacterial properties. Int J Biochem Cell Biol 2013; 45:1701-9. [DOI: 10.1016/j.biocel.2013.05.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 05/07/2013] [Accepted: 05/14/2013] [Indexed: 11/25/2022]
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50
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Evolution of Pseudomonas aeruginosa virulence as a result of phage predation. Appl Environ Microbiol 2013; 79:6110-6. [PMID: 23892756 DOI: 10.1128/aem.01421-13] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The rapid increase in the emergence of antibiotic-resistant bacteria has attracted attention to bacteriophages for treating and preventing bacterial infections. Bacteriophages can drive the diversification of Pseudomonas aeruginosa, giving rise to phage-resistant variants with different phenotypes from their ancestral hosts. In this study, we sought to investigate the effect of phage resistance on cytotoxicity of host populations toward cultured mammalian cells. The library of phage-resistant P. aeruginosa PAO1 variants used was developed previously via experimental evolution of an isogenic host population using phages PP7 and E79. Our results presented herein indicate that the phage-resistant variants developed in a heterogeneous phage environment exhibit a greater ability to impede metabolic action of cultured human keratinocytes and have a greater tendency to cause membrane damage even though they cannot invade the cells in large numbers. They also show a heightened resistance to phagocytosis by model murine macrophages. Furthermore, all isolates produced higher levels of at least one of the secreted virulence factors, namely, total proteases, elastase, phospholipase C, and hemolysins. Reverse transcription-quantitative PCR (RT-qPCR) revealed upregulation in the transcription of a number of genes associated with virulence of P. aeruginosa for the phage-resistant variants. The results of this study indicate a significant change in the in vitro virulence of P. aeruginosa following phage predation and highlight the need for caution in the selection and design of phages and phage cocktails for therapeutic use.
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