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Lichota A, Gwozdzinski K, Kowalczyk E, Kowalczyk M, Sienkiewicz M. Contribution of staphylococcal virulence factors in the pathogenesis of thrombosis. Microbiol Res 2024; 283:127703. [PMID: 38537329 DOI: 10.1016/j.micres.2024.127703] [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: 08/23/2023] [Revised: 03/20/2024] [Accepted: 03/20/2024] [Indexed: 04/17/2024]
Abstract
Staphylococci are responsible for many infections in humans, starting with skin and soft tissue infections and finishing with invasive diseases such as endocarditis, sepsis and pneumonia, which lead to high mortality. Patients with sepsis often demonstrate activated clotting pathways, decreased levels of anticoagulants, decreased fibrinolysis, activated endothelial surfaces and activated platelets. This results in disseminated intravascular coagulation and formation of a microthrombus, which can lead to a multiorgan failure. This review describes various staphylococcal virulence factors that contribute to vascular thrombosis, including deep vein thrombosis in infected patients. The article presents mechanisms of action of different factors released by bacteria in various host defense lines, which in turn can lead to formation of blood clots in the vessels.
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Affiliation(s)
- Anna Lichota
- Department of Pharmaceutical Microbiology and Microbiological Diagnostics, Medical University of Lodz, Lodz, Poland.
| | | | - Edward Kowalczyk
- Department of Pharmacology and Toxicology, Medical University of Lodz, Lodz, Poland
| | | | - Monika Sienkiewicz
- Department of Pharmaceutical Microbiology and Microbiological Diagnostics, Medical University of Lodz, Lodz, Poland
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Maritati M, Manfrini M, Iaquinta MR, Trentini A, Seraceni S, Guarino M, Costanzini A, De Giorgio R, Zanoli GA, Borghi A, Mazzoni E, De Rito G, Contini C. Acute Prosthetic Joint Infections with Poor Outcome Caused by Staphylococcus Aureus Strains Producing the Panton-Valentine Leukocidin. Biomedicines 2023; 11:1767. [PMID: 37371862 DOI: 10.3390/biomedicines11061767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/15/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
The aim of this study was to investigate whether the presence of Staphylococcus aureus (SA) producing the Panton-Valentine leukocidin (PVL) affects the outcome of Prosthetic Joint Infection (PJI). Patients with acute and chronic PJI sustained by SA were prospectively enrolled at the orthopedic unit of "Casa di Cura Santa Maria Maddalena", from January 2019 to October 2021. PJI diagnosis was reached according to the diagnostic criteria of the International Consensus Meeting on PJI of Philadelphia. Synovial fluid obtained via joint aspirations was collected in order to isolate SA. The detection of PVL was performed via real-time quantitative PCR (RT-qPCR). The outcome assessment was performed using the criteria of the Delphi-based International Multidisciplinary Consensus. Twelve cases of PJI caused by SA were included. Nine (75%) cases were acute PJI treated using debridement, antibiotic and implant retention (DAIR); the remaining three (25%) were chronic PJI treated using two-stage (n = 2) and one-stage revision (n = 1), respectively. The SA strains that tested positive for PVL genes were 5/12 (41.6%,). Treatment failure was documented in three cases of acute PJI treated using DAIR, all supported by SA-PVL strains (p < 0.045). The remaining two cases were chronic PJI treated with a revision arthroplasty (one and two stage, respectively), with a 100% eradication rate in a medium follow-up of 24 months. Although a small case series, our study showed a 100% failure rate in acute PJI, probably caused by SA PVL-producing strains treated conservatively (p < 0.04). In this setting, toxin research should guide radical surgical treatment and targeted antibiotic therapy.
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Affiliation(s)
- Martina Maritati
- Department of Medical Sciences, Infectious Diseases and Dermatology Section, University of Ferrara, Via Aldo Moro, 44124 Ferrara, Italy
- Orthopaedic Ward, Casa di Cura Santa Maria Maddalena, Via Gorizia, Occhiobello, 45030 Rovigo, Italy
| | - Marco Manfrini
- Department of Medical Sciences, Centre for Clinical and Epidemiological Research, University of Ferrara, Via Fossato di Mortara, 64/B, 44121 Ferrara, Italy
| | - Maria Rosa Iaquinta
- Department of Medical Sciences, University of Ferrara, Via Fossato di Mortara, 64/B, 44121 Ferrara, Italy
| | - Alessandro Trentini
- Department of Environmental Sciences and Prevention, University of Ferrara, Via Luigi Borsari 46, 44121 Ferrara, Italy
| | - Silva Seraceni
- Department of Medical Sciences, Infectious Diseases and Dermatology Section, University of Ferrara, Via Aldo Moro, 44124 Ferrara, Italy
- RDI Srl Cerba HealthCare, Via Del Santo 147, Limena, 35010 Padua, Italy
| | - Matteo Guarino
- Department of Translational Medicine, University of Ferrara, Via Luigi Borsari 46, 44121 Ferrara, Italy
| | - Anna Costanzini
- Department of Translational Medicine, University of Ferrara, Via Luigi Borsari 46, 44121 Ferrara, Italy
| | - Roberto De Giorgio
- Department of Translational Medicine, University of Ferrara, Via Luigi Borsari 46, 44121 Ferrara, Italy
| | - Gustavo Alberto Zanoli
- Orthopaedic Ward, Casa di Cura Santa Maria Maddalena, Via Gorizia, Occhiobello, 45030 Rovigo, Italy
| | - Alessandro Borghi
- Department of Medical Sciences, Infectious Diseases and Dermatology Section, University of Ferrara, Via Aldo Moro, 44124 Ferrara, Italy
| | - Elisa Mazzoni
- Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, Via Luigi Borsari 46, 44121 Ferrara, Italy
| | - Giuseppe De Rito
- Orthopaedic Ward, Casa di Cura Santa Maria Maddalena, Via Gorizia, Occhiobello, 45030 Rovigo, Italy
| | - Carlo Contini
- Department of Medical Sciences, Infectious Diseases and Dermatology Section, University of Ferrara, Via Aldo Moro, 44124 Ferrara, Italy
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Inchingolo AD, Malcangi G, Inchingolo AM, Piras F, Settanni V, Garofoli G, Palmieri G, Ceci S, Patano A, De Leonardis N, Di Pede C, Montenegro V, Azzollini D, Garibaldi MG, Kruti Z, Tarullo A, Coloccia G, Mancini A, Rapone B, Semjonova A, Hazballa D, D’Oria MT, Jones M, Macchia L, Bordea IR, Scarano A, Lorusso F, Tartaglia GM, Maspero C, Del Fabbro M, Nucci L, Ferati K, Ferati AB, Brienza N, Corriero A, Inchingolo F, Dipalma G. Benefits and Implications of Resveratrol Supplementation on Microbiota Modulations: A Systematic Review of the Literature. Int J Mol Sci 2022; 23:4027. [PMID: 35409389 PMCID: PMC8999966 DOI: 10.3390/ijms23074027] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/24/2022] [Accepted: 03/31/2022] [Indexed: 01/27/2023] Open
Abstract
Resveratrol is a polyphenol that has been shown to possess many applications in different fields of medicine. This systematic review has drawn attention to the axis between resveratrol and human microbiota, which plays a key role in maintaining an adequate immune response that can lead to different diseases when compromised. Resveratrol can also be an asset in new technologies, such as gene therapy. PubMed, Cochrane Library, Scopus, Web of Science, and Google Scholar were searched to find papers that matched our topic dating from 1 January 2017 up to 18 January 2022, with English-language restriction using the following Boolean keywords: ("resveratrol" AND "microbio*"). Eighteen studies were included as relevant papers matching the purpose of our investigation. Immune response, prevention of thrombotic complications, microbiota, gene therapy, and bone regeneration were retrieved as the main topics. The analyzed studies mostly involved resveratrol supplementation and its effects on human microbiota by trials in vitro, in vivo, and ex vivo. The beneficial activity of resveratrol is evident by analyzing the changes in the host's genetic expression and the gastrointestinal microbial community with its administration. The possibility of identifying individual microbial families may allow to tailor therapeutic plans with targeted polyphenolic diets when associated with microbial dysbiosis, such as inflammatory diseases of the gastrointestinal tract, degenerative diseases, tumors, obesity, diabetes, bone tissue regeneration, and metabolic syndrome.
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Affiliation(s)
- Alessio Danilo Inchingolo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Giuseppina Malcangi
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Angelo Michele Inchingolo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Fabio Piras
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Vito Settanni
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Grazia Garofoli
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Giulia Palmieri
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Sabino Ceci
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Assunta Patano
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Nicole De Leonardis
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Chiara Di Pede
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Valentina Montenegro
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Daniela Azzollini
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Maria Grazia Garibaldi
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Zamira Kruti
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Antonella Tarullo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Giovanni Coloccia
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Antonio Mancini
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Biagio Rapone
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Alexandra Semjonova
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Denisa Hazballa
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
- Kongresi Elbasanit, Aqif Pasha, Rruga, 3001 Elbasan, Albania
| | - Maria Teresa D’Oria
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
- Department of Medical and Biological Sciences, University of Udine, Via delle Scienze, 206, 33100 Udine, Italy
| | - Megan Jones
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Luigi Macchia
- Department of Emergency and Organ Transplantation (D.E.T.O.), University of Bari “Aldo Moro”, 70121 Bari, Italy;
| | - Ioana Roxana Bordea
- Department of Oral Rehabilitation, Faculty of Dentistry, Iuliu Hațieganu University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Antonio Scarano
- Department of Innovative Technologies in Medicine and Dentistry, University of Chieti-Pescara, 66100 Chieti, Italy;
| | - Felice Lorusso
- Department of Innovative Technologies in Medicine and Dentistry, University of Chieti-Pescara, 66100 Chieti, Italy;
| | - Gianluca Martino Tartaglia
- Department of Biomedical, Surgical and Dental Sciences, School of Dentistry, University of Milan, 20122 Milan, Italy; (G.M.T.); (C.M.); (M.D.F.)
- UOC Maxillo-Facial Surgery and Dentistry, Fondazione IRCCS Ca Granda, Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Cinzia Maspero
- Department of Biomedical, Surgical and Dental Sciences, School of Dentistry, University of Milan, 20122 Milan, Italy; (G.M.T.); (C.M.); (M.D.F.)
- UOC Maxillo-Facial Surgery and Dentistry, Fondazione IRCCS Ca Granda, Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Massimo Del Fabbro
- Department of Biomedical, Surgical and Dental Sciences, School of Dentistry, University of Milan, 20122 Milan, Italy; (G.M.T.); (C.M.); (M.D.F.)
- IRCCS Orthopedic Institute Galeazzi, 20161 Milan, Italy
| | - Ludovica Nucci
- Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania Luigi Vanvitelli, Via Luigi de Crecchio, 6, 80138 Naples, Italy;
| | - Kenan Ferati
- Faculty of Medical Sciences, University of Tetovo, 1220 Tetovo, North Macedonia; (K.F.); (A.B.F.)
| | - Arberesha Bexheti Ferati
- Faculty of Medical Sciences, University of Tetovo, 1220 Tetovo, North Macedonia; (K.F.); (A.B.F.)
| | - Nicola Brienza
- Unit of Anesthesia and Resuscitation, Department of Emergencies and Organ Transplantations, Aldo Moro University, 70124 Bari, Italy; (N.B.); (A.C.)
| | - Alberto Corriero
- Unit of Anesthesia and Resuscitation, Department of Emergencies and Organ Transplantations, Aldo Moro University, 70124 Bari, Italy; (N.B.); (A.C.)
| | - Francesco Inchingolo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Gianna Dipalma
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
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Staali L, Colin DA. Bi-component HlgC/HlgB and HlgA/HlgB γ-hemolysins from S. aureus: Modulation of Ca 2+ channels activity through a differential mechanism. Toxicon 2021; 201:74-85. [PMID: 34411591 DOI: 10.1016/j.toxicon.2021.08.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 07/21/2021] [Accepted: 08/10/2021] [Indexed: 10/20/2022]
Abstract
Staphylococcal bi-component leukotoxins known as *pore-forming toxins* induce upon a specific binding to membrane receptors, two independent cellular events in human neutrophils. First, they provoke the opening of pre-existing specific ionic channels including Ca2+ channels. Then, they form membrane pores specific to monovalent cations leading to immune cells death. Among these leukotoxins, HlgC/HlgB and HlgA/HlgB γ-hemolysins do act in synergy to induce the opening of different types of Ca2+ channels in the absence as in the presence of extracellular Ca2+. Here, we investigate the mechanism underlying the modulation of Ca2+-independent Ca2+ channels in response to both active leukotoxins in human neutrophils. In the absence of extracellular Ca2+, the Mn2+ has been used as a Ca2+ surrogate to determine the activity of Ca2+-independent Ca2+ channels. Our findings provide new insights about different mechanisms involved in the staphylococcal γ-hemolysins activity to regulate three different types of Ca2+-independent Ca2+ channels. We conclude that (i) HlgC/HlgB stimulates the opening of La3+-sensitive Ca2+ channels, through a cholera toxin-sensitive G protein, (ii) HlgA/HlgB stimulates the opening of Ca2+ channels not sensitive to La3+, through a G protein-independent process, and (iii) unlike HlgA/HlgB, HlgC/HlgB toxins prevent the opening of a new type of Ca2+ channels by phosphorylation/de-phosphorylation-dependent mechanisms.
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Affiliation(s)
- Leila Staali
- Bacteriology Institute of Medical Faculty, Louis Pasteur University, 3 rue Koeberlé, F-67000, Strasbourg, France.
| | - Didier A Colin
- Bacteriology Institute of Medical Faculty, Louis Pasteur University, 3 rue Koeberlé, F-67000, Strasbourg, France
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Irrelevance of Panton-Valentine leukocidin in hidradenitis suppurativa: results from a pilot, observational study. Eur J Clin Microbiol Infect Dis 2020; 40:77-83. [PMID: 32767177 PMCID: PMC7782376 DOI: 10.1007/s10096-020-04002-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 07/30/2020] [Indexed: 12/13/2022]
Abstract
Panton-Valentine leukocidin (PVL) appears to be a virulence factor which, among others, can exacerbate the pathogenicity of Staphylococcus aureus infections, especially inducing severe necrotic, deep-seated skin infections, abscesses, and recurrences. These peculiarities have some overlaps with hidradenitis suppurativa (HS). Our main aim was to assess if S. aureus producing PVL could have some role in influencing clinical features and/or course of HS, specifically in the suppuration and recurrence of lesions. This pilot, mono-centric, observational study included all adult subjects affected with HS consecutively referring to our HS clinic over a 3-month period. Clinically evident suppuration and at least 2 weeks wash out from any antibiotic were the main inclusion criteria. Purulent material from HS skin lesions was collected with swabs in order to isolate micro-organisms, with specific regard to S. aureus. Detection of PVL was performed by real-time quantitative PCR (RT-qPCR). We also analyzed purulent material from suppurative skin lesions other than HS, as a control. Thirty HS patients were included; 29 purulent lesions (96.7%) harbored at least one bacterial species. Five (16.7%) swab samples were positive for S. aureus, none of which was positive for PVL genes. Among the 30 purulent disorders included as controls, 8 (26.3%) were positive for S. aureus; of these, 4 strains (50%) expressed LPV. The study results seem to exclude the pathogenetic involvement of S. aureus producing PVL in HS; as a result, PVL does not seem to represent a potential target in the future development of HS treatments.
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6
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Chalmers SJ, Wylam ME. Methicillin-Resistant Staphylococcus aureus Infection and Treatment Options. Methods Mol Biol 2020; 2069:229-251. [PMID: 31523777 DOI: 10.1007/978-1-4939-9849-4_16] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a leading cause of infection worldwide, including a wide array of both hospital- and community-acquired infections-most commonly bacteremia, upper and lower respiratory tract infection, skin and soft-tissue infection, osteomyelitis, and septic arthritis. This chapter describes the epidemiology of MRSA infection, its ability to confer antibiotic resistance and produce a wide array of virulence factors, and its pivotal role in human infection, especially cystic fibrosis. It also provides an introduction to the strategies for treatment of both chronic and acute MRSA infections.
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Affiliation(s)
- Sarah J Chalmers
- Division of Pulmonary and Critical Care Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - Mark E Wylam
- Division of Pulmonary and Critical Care Medicine, Mayo Clinic College of Medicine, Rochester, MN, USA.
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7
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Ogata H, Nagasawa K, Takeuchi N, Hagiwara S, Sawada D, Umimura T, Konno Y, Yamaide F, Takatani R, Takatani T, Nakano T, Hishiki H, Ishiwada N, Shimojo N. Psoitis and multiple venous thromboses caused by Panton Valentine Leukocidin-positive methicillin-sensitive Staphylococcus aureus in a 12-year-old girl: A case report. J Infect Chemother 2019; 25:630-634. [PMID: 30902556 DOI: 10.1016/j.jiac.2019.02.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 02/16/2019] [Accepted: 02/25/2019] [Indexed: 10/27/2022]
Abstract
Panton Valentine Leukocidin (PVL) is one of the many toxins produced by Staphylococcus aureus. In Japan, PVL-positive S. aureus strains are mainly methicillin-resistant S. aureus (MRSA). Data regarding PVL-positive methicillin-sensitive S. aureus (MSSA) are scarce. In this report, we describe a case of severe infection by PVL-positive MSSA. A 12-year-old healthy girl was admitted with high fever and pain in the lower back. Computed tomography revealed a diagnosis of psoitis and multiple venous thromboses. Blood cultures obtained after admission revealed infection with MSSA. Her fever continued despite adequate antibiotic therapy. On the fifth hospitalization day, she developed bladder dysfunction, and an abscess was noted near the third lumbar vertebra. She underwent an emergency operation and recovered. Bacterial analyses revealed that the causative MSSA was a PVL-producing single variant of ST8 (related to USA300clone), of sequence type 2149. PVL is known to cause platelet activation. This case demonstrates the need for detailed analyses of the causative strain of bacteria in cases of S. aureus infection with deep vein thrombosis, even in cases of known MSSA infection.
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Affiliation(s)
- Hitoshi Ogata
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan
| | - Koo Nagasawa
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan.
| | | | - Sho Hagiwara
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan
| | - Daisuke Sawada
- Department of Pediatrics, Kimitsu Central Hospital, Japan
| | - Tomotaka Umimura
- Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | - Yuki Konno
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan
| | - Fumiya Yamaide
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan
| | - Rieko Takatani
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan
| | - Tomozumi Takatani
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan
| | - Taiji Nakano
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan
| | - Haruka Hishiki
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan
| | | | - Naoki Shimojo
- Department of Pediatrics, Graduate School of Medicine, Chiba University, Japan
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8
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Effect of 25-methoxy hispidol A isolated from Poncirus trifoliate against bacteria-induced anxiety and depression by targeting neuroinflammation, oxidative stress and apoptosis in mice. Biomed Pharmacother 2019; 111:209-223. [DOI: 10.1016/j.biopha.2018.12.047] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 12/08/2018] [Accepted: 12/12/2018] [Indexed: 11/20/2022] Open
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9
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Panton-Valentine Leukocidin associated with S. aureus osteomyelitis activates platelets via neutrophil secretion products. Sci Rep 2018; 8:2185. [PMID: 29391581 PMCID: PMC5794969 DOI: 10.1038/s41598-018-20582-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 01/15/2018] [Indexed: 02/01/2023] Open
Abstract
Globalization and migration promote the spread of Panton-Valentine leukocidin (PVL)-positive Staphylococcus aureus strains. The toxin PVL is linked to the development of thrombosis in association with osteomyelitis. The mechanisms by which PVL drives thrombosis development are however still unknown. We demonstrate that PVL-damaged neutrophils activate platelets via neutrophil secretion products, such as α-defensins and the myeloperoxidase product HOCl, as well as the formation of HOCl-modified proteins. Neutrophil damage by PVL is blocked by anti-PVL-antibodies, explaining why especially young osteomyelitis patients with a low antibody titre against PVL suffer from thrombotic complications. Platelet activation in the presence of PVL-damaged neutrophils is prevented by α-defensin inhibitors and by glutathione and resveratrol, which are both inhibitors of HOCl-modified protein-induced platelet activation. Remarkably, intravenously infused glutathione also prevents activation of human platelets in an ex vivo assay. We here describe a new mechanism of PVL-neutrophil-platelet interactions, which might be extrapolated to other toxins that act on neutrophils. Our observations may make us think about new approaches to treat and/or prevent thrombotic complications in the course of infections with PVL-producing S. aureus strains.
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10
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Guerra FE, Borgogna TR, Patel DM, Sward EW, Voyich JM. Epic Immune Battles of History: Neutrophils vs. Staphylococcus aureus. Front Cell Infect Microbiol 2017; 7:286. [PMID: 28713774 PMCID: PMC5491559 DOI: 10.3389/fcimb.2017.00286] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 06/12/2017] [Indexed: 12/23/2022] Open
Abstract
Neutrophils are the most abundant leukocytes in human blood and the first line of defense after bacteria have breached the epithelial barriers. After migration to a site of infection, neutrophils engage and expose invading microorganisms to antimicrobial peptides and proteins, as well as reactive oxygen species, as part of their bactericidal arsenal. Ideally, neutrophils ingest bacteria to prevent damage to surrounding cells and tissues, kill invading microorganisms with antimicrobial mechanisms, undergo programmed cell death to minimize inflammation, and are cleared away by macrophages. Staphylococcus aureus (S. aureus) is a prevalent Gram-positive bacterium that is a common commensal and causes a wide range of diseases from skin infections to endocarditis. Since its discovery, S. aureus has been a formidable neutrophil foe that has challenged the efficacy of this professional assassin. Indeed, proper clearance of S. aureus by neutrophils is essential to positive infection outcome, and S. aureus has developed mechanisms to evade neutrophil killing. Herein, we will review mechanisms used by S. aureus to modulate and evade neutrophil bactericidal mechanisms including priming, activation, chemotaxis, production of reactive oxygen species, and resolution of infection. We will also highlight how S. aureus uses sensory/regulatory systems to tailor production of virulence factors specifically to the triggering signal, e.g., neutrophils and defensins. To conclude, we will provide an overview of therapeutic approaches that may potentially enhance neutrophil antimicrobial functions.
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Affiliation(s)
- Fermin E Guerra
- Department of Microbiology and Immunology, Montana State UniversityBozeman, MT, United States
| | - Timothy R Borgogna
- Department of Microbiology and Immunology, Montana State UniversityBozeman, MT, United States
| | - Delisha M Patel
- Department of Microbiology and Immunology, Montana State UniversityBozeman, MT, United States
| | - Eli W Sward
- Department of Microbiology and Immunology, Montana State UniversityBozeman, MT, United States
| | - Jovanka M Voyich
- Department of Microbiology and Immunology, Montana State UniversityBozeman, MT, United States
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11
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Seilie ES, Bubeck Wardenburg J. Staphylococcus aureus pore-forming toxins: The interface of pathogen and host complexity. Semin Cell Dev Biol 2017; 72:101-116. [PMID: 28445785 DOI: 10.1016/j.semcdb.2017.04.003] [Citation(s) in RCA: 139] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 03/22/2017] [Accepted: 04/18/2017] [Indexed: 12/20/2022]
Abstract
Staphylococcus aureus is a prominent human pathogen capable of infecting a variety of host species and tissue sites. This versatility stems from the pathogen's ability to secrete diverse host-damaging virulence factors. Among these factors, the S. aureus pore-forming toxins (PFTs) α-toxin and the bicomponent leukocidins, have garnered much attention for their ability to lyse cells at low concentrations and modulate disease severity. Although many of these toxins were discovered nearly a century ago, their host cell specificities have only been elucidated over the past five to six years, starting with the discovery of the eukaryotic receptor for α-toxin and rapidly followed by identification of the leukocidin receptors. The identification of these receptors has revealed the species- and cell type-specificity of toxin binding, and provided insight into non-lytic effects of PFT intoxication that contribute to disease pathogenesis.
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Affiliation(s)
- E Sachiko Seilie
- Department of Pediatrics, The University of Chicago, Chicago, IL 60637, United States; Department of Microbiology, The University of Chicago, Chicago, IL 60637, United States
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12
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Zimmermann-Meisse G, Prévost G, Jover E. Above and beyond C5a Receptor Targeting by Staphylococcal Leucotoxins: Retrograde Transport of Panton-Valentine Leucocidin and γ-Hemolysin. Toxins (Basel) 2017; 9:toxins9010041. [PMID: 28117704 PMCID: PMC5308273 DOI: 10.3390/toxins9010041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 01/10/2017] [Accepted: 01/16/2017] [Indexed: 12/03/2022] Open
Abstract
Various membrane receptors associated with the innate immune response have recently been identified as mediators of the cellular action of Staphylococcus aureus leucotoxins. Two of these, the Panton–Valentine leucotoxin LukS-PV/LukF-PV and the γ-hemolysin HlgC/HlgB, bind the C5a complement-derived peptide receptor. These leucotoxins utilize the receptor to induce intracellular Ca2+ release from internal stores, other than those activated by C5a. The two leucotoxins are internalized with the phosphorylated receptor, but it is unknown whether they divert retrograde transport of the receptor or follow another pathway. Immunolabeling and confocal microscopic techniques were used to analyze the presence of leucotoxins in endosomes, lysosomes, endoplasmic reticulum, and Golgi. The two leucotoxins apparently followed retrograde transport similar to that of the C5a peptide-activated receptor. However, HlgC/HlgB reached the Golgi network very early, whereas LukS-PV/LukF-PV followed slower kinetics. The HlgC/HlgB leucotoxin remained in neutrophils 6 h after a 10-min incubation of the cells in the presence of the toxin with no signs of apoptosis, whereas apoptosis was observed 3 h after neutrophils were incubated with LukS-PV/LukF-PV. Such retrograde transport of leucotoxins provides a novel understanding of the cellular effects initiated by sublytic concentrations of these toxins.
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Affiliation(s)
- Gaëlle Zimmermann-Meisse
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), VBP EA7290, Institut de Bactériologie, Université de Strasbourg, 3 rue Koeberlé, F-67000 Strasbourg, France.
| | - Gilles Prévost
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), VBP EA7290, Institut de Bactériologie, Université de Strasbourg, 3 rue Koeberlé, F-67000 Strasbourg, France.
| | - Emmanuel Jover
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), VBP EA7290, Institut de Bactériologie, Université de Strasbourg, 3 rue Koeberlé, F-67000 Strasbourg, France.
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13
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The bicomponent pore-forming leucocidins of Staphylococcus aureus. Microbiol Mol Biol Rev 2015; 78:199-230. [PMID: 24847020 DOI: 10.1128/mmbr.00055-13] [Citation(s) in RCA: 192] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The ability to produce water-soluble proteins with the capacity to oligomerize and form pores within cellular lipid bilayers is a trait conserved among nearly all forms of life, including humans, single-celled eukaryotes, and numerous bacterial species. In bacteria, some of the most notable pore-forming molecules are protein toxins that interact with mammalian cell membranes to promote lysis, deliver effectors, and modulate cellular homeostasis. Of the bacterial species capable of producing pore-forming toxic molecules, the Gram-positive pathogen Staphylococcus aureus is one of the most notorious. S. aureus can produce seven different pore-forming protein toxins, all of which are believed to play a unique role in promoting the ability of the organism to cause disease in humans and other mammals. The most diverse of these pore-forming toxins, in terms of both functional activity and global representation within S. aureus clinical isolates, are the bicomponent leucocidins. From the first description of their activity on host immune cells over 100 years ago to the detailed investigations of their biochemical function today, the leucocidins remain at the forefront of S. aureus pathogenesis research initiatives. Study of their mode of action is of immediate interest in the realm of therapeutic agent design as well as for studies of bacterial pathogenesis. This review provides an updated perspective on our understanding of the S. aureus leucocidins and their function, specificity, and potential as therapeutic targets.
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14
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Tawk MY, Zimmermann K, Bossu J, Potrich C, Bourcier T, Dalla Serra M, Poulain B, Prévost G, Jover E. Internalization of staphylococcal leukotoxins that bind and divert the
C
5a receptor is required for intracellular
Ca
2+
mobilization by human neutrophils. Cell Microbiol 2015; 17:1241-57. [DOI: 10.1111/cmi.12434] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 01/26/2015] [Accepted: 03/01/2015] [Indexed: 01/12/2023]
Affiliation(s)
- Mira Y. Tawk
- Fédération de Médecine Translationnelle de Strasbourg EA7290 Virulence Bactérienne Précoce Institut de Bactériologie et Hôpitaux Universitaires de Strasbourg Université de Strasbourg Strasbourg France
| | - Kiran Zimmermann
- Fédération de Médecine Translationnelle de Strasbourg EA7290 Virulence Bactérienne Précoce Institut de Bactériologie et Hôpitaux Universitaires de Strasbourg Université de Strasbourg Strasbourg France
| | - Jean‐Louis Bossu
- INCI – UPR‐CNRS 3212 Physiologie des réseaux de neurones Strasbourg France
| | - Cristina Potrich
- National Research Council of Italy Institute of Biophysics and Bruno Kessler Foundation Trento Italy
| | - Tristan Bourcier
- Fédération de Médecine Translationnelle de Strasbourg EA7290 Virulence Bactérienne Précoce Institut de Bactériologie et Hôpitaux Universitaires de Strasbourg Université de Strasbourg Strasbourg France
| | - Mauro Dalla Serra
- National Research Council of Italy Institute of Biophysics and Bruno Kessler Foundation Trento Italy
| | - Bernard Poulain
- INCI – UPR‐CNRS 3212 Physiologie des réseaux de neurones Strasbourg France
| | - Gilles Prévost
- Fédération de Médecine Translationnelle de Strasbourg EA7290 Virulence Bactérienne Précoce Institut de Bactériologie et Hôpitaux Universitaires de Strasbourg Université de Strasbourg Strasbourg France
| | - Emmanuel Jover
- Fédération de Médecine Translationnelle de Strasbourg EA7290 Virulence Bactérienne Précoce Institut de Bactériologie et Hôpitaux Universitaires de Strasbourg Université de Strasbourg Strasbourg France
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15
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p-Sulfonato-calix[n]arenes inhibit staphylococcal bicomponent leukotoxins by supramolecular interactions. Biochem J 2013; 450:559-71. [PMID: 23282185 DOI: 10.1042/bj20121628] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PVL (Panton-Valentine leukocidin) and other Staphylococcus aureus β-stranded pore-forming toxins are important virulence factors involved in various pathologies that are often necrotizing. The present study characterized leukotoxin inhibition by selected SCns (p-sulfonato-calix[n]arenes): SC4, SC6 and SC8. These chemicals have no toxic effects on human erythrocytes or neutrophils, and some are able to inhibit both the activity of and the cell lysis by leukotoxins in a dose-dependent manner. Depending on the type of leukotoxins and SCns, flow cytometry revealed IC50 values of 6-22 μM for Ca2+ activation and of 2-50 μM for cell lysis. SCns were observed to affect membrane binding of class S proteins responsible for cell specificity. Electrospray MS and surface plasmon resonance established supramolecular interactions (1:1 stoichiometry) between SCns and class S proteins in solution, but not class F proteins. The membrane-binding affinity of S proteins was Kd=0.07-6.2 nM. The binding ability was completely abolished by SCns at different concentrations according to the number of benzenes (30-300 μM; SC8>SC6≫SC4). The inhibitory properties of SCns were also observed in vivo in a rabbit model of PVL-induced endophthalmitis. These calixarenes may represent new therapeutic avenues aimed at minimizing inflammatory reactions and necrosis due to certain virulence factors.
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16
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Bacterial survival amidst an immune onslaught: the contribution of the Staphylococcus aureus leukotoxins. PLoS Pathog 2013; 9:e1003143. [PMID: 23436994 PMCID: PMC3578777 DOI: 10.1371/journal.ppat.1003143] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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17
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Parker H, Winterbourn CC. Reactive oxidants and myeloperoxidase and their involvement in neutrophil extracellular traps. Front Immunol 2013; 3:424. [PMID: 23346086 PMCID: PMC3549523 DOI: 10.3389/fimmu.2012.00424] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 12/23/2012] [Indexed: 12/20/2022] Open
Abstract
Neutrophils release extracellular traps (NETs) in response to a variety of inflammatory stimuli. These structures are composed of a network of chromatin strands associated with a variety of neutrophil-derived proteins including the enzyme myeloperoxidase (MPO). Studies into the mechanisms leading to the formation of NETs indicate a complex process that differs according to the stimulus. With some stimuli an active nicotinamide adenine dinucleotide phosphate (NADPH) oxidase is required. However, assigning specific reactive oxygen species involved downstream of the oxidase is a difficult task and definitive proof for any single oxidant is still lacking. Pharmacological inhibition of MPO and the use of MPO-deficient neutrophils indicate active MPO is required with phorbol myristate acetate as a stimulus but not necessarily with bacteria. Reactive oxidants and MPO may also play a role in NET-mediated microbial killing. MPO is present on NETs and maintains activity at this site. Therefore, MPO has the potential to generate reactive oxidants in close proximity to trapped microorganisms and thus effect microbial killing. This brief review discusses current evidence for the involvement of reactive oxidants and MPO in NET formation and their potential contribution to NET antimicrobial activity.
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Affiliation(s)
- Heather Parker
- Centre for Free Radical Research, Department of Pathology, University of Otago Christchurch Christchurch, New Zealand
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Malachowa N, Kobayashi SD, Braughton KR, Whitney AR, Parnell MJ, Gardner DJ, Deleo FR. Staphylococcus aureus leukotoxin GH promotes inflammation. J Infect Dis 2012; 206:1185-93. [PMID: 22872735 DOI: 10.1093/infdis/jis495] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Staphylococcus aureus produces numerous molecules that facilitate survival in the host. We recently identified a novel S. aureus leukotoxin (leukotoxin GH [LukGH]) using proteomics, but its role in virulence remains unclear. Here we investigated the role of LukGH in vivo. METHODS We tested cytotoxicity of LukGH toward polymorphonuclear leukocytes (PMNs) from mice, rabbits, monkeys, and humans. LukGH was administered to mice, rabbits, and a cynomolgus monkey by subcutaneous or intradermal injection to assess cytotoxicity or host response in vivo. The effects of LukGH in vivo were compared with those of Panton-Valentine leukocidin (PVL), a well-characterized S. aureus leukotoxin. The contribution of LukGH to S. aureus infection was tested using mouse and rabbit infection models. RESULTS Susceptibility of PMNs to LukGH was similar between humans and cynomolgus monkeys, and was greater than that of rabbits, which in turn was greater than that of mice. LukGH or PVL caused skin inflammation in rabbits and a monkey, but deletion of neither lukGH nor lukGH and lukS/F-PV reduced severity of USA300 infections in rabbits or mice. Rather, some disease parameters (eg, rabbit abscess size) were increased following infection with a lukGH and lukS/F-PV deletion strain. CONCLUSIONS Our findings indicate that S. aureus leukotoxins enhance the host inflammatory response and influence the outcome of infection.
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Affiliation(s)
- Natalia Malachowa
- Laboratory of Human Bacterial Pathogenesis, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, USA
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19
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Graves SF, Kobayashi SD, Braughton KR, Whitney AR, Sturdevant DE, Rasmussen DL, Kirpotina LN, Quinn MT, DeLeo FR. Sublytic concentrations of Staphylococcus aureus Panton-Valentine leukocidin alter human PMN gene expression and enhance bactericidal capacity. J Leukoc Biol 2012; 92:361-74. [PMID: 22581932 DOI: 10.1189/jlb.1111575] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
CA-MRSA infections are often caused by strains encoding PVL, which can cause lysis of PMNs and other myeloid cells in vitro, a function considered widely as the primary means by which PVL might contribute to disease. However, at sublytic concentrations, PVL can function as a PMN agonist. To better understand this phenomenon, we investigated the ability of PVL to alter human PMN function. PMNs exposed to PVL had enhanced capacity to produce O(2)(-) in response to fMLF, but unlike priming by LPS, this response did not require TLR signal transduction. On the other hand, there was subcellular redistribution of NADPH oxidase components in PMNs following exposure of these cells to PVL--a finding consistent with priming. Importantly, PMNs primed with PVL had an enhanced ability to bind/ingest and kill Staphylococcus aureus. Priming of PMNs with other agonists, such as IL-8 or GM-CSF, altered the ability of PVL to cause formation of pores in the plasma membranes of these cells. Microarray analysis revealed significant changes in the human PMN transcriptome following exposure to PVL, including up-regulation of molecules that regulate the inflammatory response. Consistent with the microarray data, mediators of the inflammatory response were released from PMNs after stimulation with PVL. We conclude that exposure of human PMNs to sublytic concentrations of PVL elicits a proinflammatory response that is regulated in part at the level of gene expression. We propose that PVL-mediated priming of PMNs enhances the host innate immune response.
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Affiliation(s)
- Shawna F Graves
- Laboratory of Bacterial Pathogenesis, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, USA
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20
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Rigby KM, DeLeo FR. Neutrophils in innate host defense against Staphylococcus aureus infections. Semin Immunopathol 2011; 34:237-59. [PMID: 22080185 PMCID: PMC3271231 DOI: 10.1007/s00281-011-0295-3] [Citation(s) in RCA: 269] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Accepted: 10/14/2011] [Indexed: 12/29/2022]
Abstract
Staphylococcus aureus has been an important human pathogen throughout history and is currently a leading cause of bacterial infections worldwide. S. aureus has the unique ability to cause a continuum of diseases, ranging from minor skin infections to fatal necrotizing pneumonia. Moreover, the emergence of highly virulent, drug-resistant strains such as methicillin-resistant S. aureus in both healthcare and community settings is a major therapeutic concern. Neutrophils are the most prominent cellular component of the innate immune system and provide an essential primary defense against bacterial pathogens such as S. aureus. Neutrophils are rapidly recruited to sites of infection where they bind and ingest invading S. aureus, and this process triggers potent oxidative and non-oxidative antimicrobial killing mechanisms that serve to limit pathogen survival and dissemination. S. aureus has evolved numerous mechanisms to evade host defense strategies employed by neutrophils, including the ability to modulate normal neutrophil turnover, a process critical to the resolution of acute inflammation. Here we provide an overview of the role of neutrophils in host defense against bacterial pathogens and discuss strategies employed by S. aureus to circumvent neutrophil function.
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Affiliation(s)
- Kevin M Rigby
- Laboratory of Human Pathogenesis, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 903 South 4th Street, Hamilton, MT 59840, USA
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21
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Lo WT, Wang CC. Panton-Valentine leukocidin in the pathogenesis of community-associated methicillin-resistant Staphylococcus aureus infection. Pediatr Neonatol 2011; 52:59-65. [PMID: 21524624 DOI: 10.1016/j.pedneo.2011.02.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 05/17/2010] [Accepted: 06/22/2010] [Indexed: 11/19/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is an important human pathogen that causes serious infectious diseases and was endemic in hospitals by the late 1960s. Beginning with its first report in the late 1990s, the rapid emergence of community-associated MRSA (CA-MRSA) worldwide responsible for a wide spectrum of diseases ranging from minor skin infections to fatal necrotizing pneumonia has been found in previously healthy individuals without established risk factors for MRSA acquisition. Recently, various virulence determinants unique to CA-MRSA have been uncovered, which explain how the pathogen spreads easily and causes severe CA-MRSA infections among humans. However, the role of Panton-Valentine leukocidin (PVL) in the pathogenesis of CA-MRSA infection is currently a matter of much debate because of conflicting data from epidemiologic studies of CA-MRSA infections and various murine disease models. Identifying specialized pathogenic traits of CA-MRSA and the concerted regulation of these factors remains a challenge that will foster development of vaccines and therapies designed to control CA-MRSA infections. This review focuses on the current status of molecular epidemiology associated with CA-MRSA in Taiwan and progresses toward understanding the enhanced virulence properties of CA-MRSA, with an emphasis on the role of Panton-Valentine leukocidin.
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Affiliation(s)
- Wen-Tsung Lo
- Department of Pediatrics, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
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22
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Regulation of innate immune response to Candida albicans infections by αMβ2-Pra1p interaction. Infect Immun 2011; 79:1546-58. [PMID: 21245270 DOI: 10.1128/iai.00650-10] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Candida albicans is a common opportunistic fungal pathogen and is the leading cause of invasive fungal diseases in immunocompromised individuals. The induction of cell-mediated immunity to C. albicans is one of the main tasks of cells of the innate immune system, and in vitro evidence suggests that integrin α(M)β₂ (CR3, Mac-1, and CD11b/CD18) is the principal leukocyte receptor involved in recognition of the fungus. Using α(M)β₂-KO mice and mutated strains of C. albicans in two models of murine candidiasis, we demonstrate that neutrophils derived from mice deficient in α(M)β₂ have a reduced ability to kill C. albicans and that the deficient mice themselves exhibit increased susceptibility to fungal infection. Disruption of the PRA1 gene of C. albicans, the primary ligand for α(M)β₂, protects the fungus against leukocyte killing in vitro and in vivo, impedes the innate immune response to the infection, and increases fungal virulence and organ invasion in vivo. Thus, recognition of pH-regulated antigen 1 protein (Pra1p) by α(M)β₂ plays a pivotal role in determining fungal virulence and host response and protection against C. albicans infection.
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Abstract
PURPOSE OF REVIEW To consider the relevance to severe human lung infections of recently discovered virulence mechanisms of Staphylococcus aureus and Francisella tularensis. RECENT FINDINGS S. aureus has long been considered an opportunistic pathogen. However, due to the emergence of community-acquired methicillin-resistant S. aureus (CA-MRSA) strains that can readily infect and kill normal hosts, S. aureus must now be considered a potentially virulent pathogen. The evolution of S. aureus from an organism associated with asymptomatic nasopharyngeal colonization to one associated with community-acquired lethal infections may reflect horizontal acquisition of bacterial genes that enable efficient spread, aggressive host invasion, and effective immune evasion. Alleviating the burden of staphylococcal disease will require better understanding of host susceptibility and of staphylococcal virulence and antibiotic resistance. In contrast to the rapidly evolving staphylococcal virulence strategy, recent genomic analysis of F. tularensis has revealed a small set of bacterial genes associated with the marked virulence of its North American subspecies. This suggests that a relatively stable strategy of immune evasion underlies this pathogen's ability to establish serious life-threatening lung infections from a very small inoculum. SUMMARY Understanding bacterial pathogenesis will require additional research into both host susceptibility factors and bacterial virulence mechanisms, including horizontal gene transfer. Refinements in the molecular detection of bacteria in the clinical setting, as well as whole genome analysis of both pathogens and patients, are expected to aid in the understanding of bacterial-induced lung injury.
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DeLeo FR, Chambers HF. Reemergence of antibiotic-resistant Staphylococcus aureus in the genomics era. J Clin Invest 2009; 119:2464-74. [PMID: 19729844 DOI: 10.1172/jci38226] [Citation(s) in RCA: 337] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Staphylococcus aureus is the leading cause of bacterial infections in developed countries and produces a wide spectrum of diseases, ranging from minor skin infections to fatal necrotizing pneumonia. Although S. aureus infections were historically treatable with common antibiotics, emergence of drug-resistant organisms is now a major concern. Methicillin-resistant S. aureus (MRSA) was endemic in hospitals by the late 1960s, but it appeared rapidly and unexpectedly in communities in the 1990s and is now prevalent worldwide. This Review focuses on progress made toward understanding the success of community-associated MRSA as a human pathogen, with an emphasis on genome-wide approaches and virulence determinants.
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Affiliation(s)
- Frank R DeLeo
- Laboratory of Human Bacterial Pathogenesis, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, NIH, Hamilton, Montana 59840, USA.
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25
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Anwar S, Prince LR, Foster SJ, Whyte MKB, Sabroe I. The rise and rise of Staphylococcus aureus: laughing in the face of granulocytes. Clin Exp Immunol 2009; 157:216-24. [PMID: 19604261 DOI: 10.1111/j.1365-2249.2009.03950.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Recent developments in the study of host-pathogen interactions have fundamentally altered our understanding of the nature of Staphylococcus aureus infection, and previously held tenets regarding the role of the granulocyte are being cast aside. Novel mechanisms of pathogenesis are becoming evident, revealing the extent to which S. aureus can evade neutrophil responses successfully by resisting microbicides, surviving intracellularly and subverting cell death pathways. Developing a detailed understanding of these complex strategies is especially relevant in light of increasing staphylococcal virulence and antibiotic resistance, and the knowledge that dysfunctional neutrophil responses contribute materially to poor host outcomes. Unravelling the biology of these interactions is a challenging task, but one which may yield new strategies to address this, as yet, defiant organism.
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Affiliation(s)
- S Anwar
- Academic Unit of Respiratory Medicine, School of Medicine and Biomedical Sciences, University of Sheffield, Royal Hallamshire Hospital, Sheffield, UK
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26
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Abstract
Staphylococcus aureus is notorious for its ability to become resistant to antibiotics. Infections that are caused by antibiotic-resistant strains often occur in epidemic waves that are initiated by one or a few successful clones. Methicillin-resistant S. aureus (MRSA) features prominently in these epidemics. Historically associated with hospitals and other health care settings, MRSA has now emerged as a widespread cause of community infections. Community or community-associated MRSA (CA-MRSA) can spread rapidly among healthy individuals. Outbreaks of CA-MRSA infections have been reported worldwide, and CA-MRSA strains are now epidemic in the United States. Here, we review the molecular epidemiology of the epidemic waves of penicillin- and methicillin-resistant strains of S. aureus that have occurred since 1940, with a focus on the clinical and molecular epidemiology of CA-MRSA.
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Affiliation(s)
- Henry F Chambers
- Division of Infectious Diseases, Department of Medicine, San Francisco General Hospital, University of California, San Francisco, California 94110, USA.
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Biswas S, Rahman I. Modulation of steroid activity in chronic inflammation: a novel anti-inflammatory role for curcumin. Mol Nutr Food Res 2009; 52:987-94. [PMID: 18327875 DOI: 10.1002/mnfr.200700259] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The expression of NF-kappaB (NF-kappaB)-dependent pro-inflammatory genes in response to oxidative stress is regulated by the acetylation-deacetylation status of histones bound to the DNA. It has been suggested that in severe asthma and in chronic obstructive pulmonary disease (COPD) patients, oxidative stress not only activates the NF-kappaB pathway but also alters the histone acetylation and deacetylation balance via post-translational modification of histone deacetylases (HDACs). Corticosteroids have been one of the major modes of therapy against various chronic respiratory diseases such as asthma and COPD. Failure of corticosteroids to ameliorate such disease conditions has been attributed to their inability to either recruit HDAC2 or to the presence of an oxidatively modified HDAC2 in asthmatics and COPD subjects. Naturally occurring polyphenols such as curcumin and resveratrol have been increasingly considered as safer nutraceuticals. Curcumin is a polyphenol present in the spice turmeric, which can directly scavenge free radicals such as superoxide anion and nitric oxide and modulate important signaling pathways mediated via NF-kappaB and mitogen-activated protein kinase pathways. Polyphenols also down-regulate expression of pro-inflammatory mediators, matrix metalloproteinases, adhesion molecules, and growth factor receptor genes and they up-regulate HDAC2 in the lung. Thus, curcumin may be a potential antioxidant and anti-inflammatory therapeutic agent against chronic inflammatory lung diseases.
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Affiliation(s)
- Saibal Biswas
- Department of Environmental Medicine, Lung Biology and Disease Program, University of Rochester Medical Center, Rochester, NY 14642, USA
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Analysis of the specificity of Panton-Valentine leucocidin and gamma-hemolysin F component binding. Infect Immun 2008; 77:266-73. [PMID: 18838523 DOI: 10.1128/iai.00402-08] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In this study, the binding of F components of the staphylococcal bicomponent leukotoxins Panton-Valentine leucocidin (LukF-PV) and gamma-hemolysin (HlgB) on polymorphonuclear neutrophils (PMNs), monocytes, and lymphocytes was determined using labeled mutants and flow cytometry. Leukotoxin activity was evaluated by measuring Ca(2+) entry or pore formation using spectrofluorometry or flow cytometry. Although HlgB had no affinity for cells in the absence of an S component, LukF-PV had high affinity for PMNs (dissociation constant [K(d)], 6.2 +/- 1.9 nM; n = 8), monocytes (K(d), 2.8 +/- 0.8 nM; n = 7), and lymphocytes (K(d), 1.2 +/- 0.2 nM; n = 7). Specific binding of HlgB was observed only after addition of LukS-PV on PMNs (K(d), 1.1 +/- 0.2 nM; n = 4) and monocytes (K(d), 0.84 +/- 0.31 nM; n = 4) or after addition of HlgC on PMNs, monocytes, and lymphocytes. Addition of LukS-PV or HlgC induced a second specific binding of LukF-PV on PMNs. HlgB and LukD competed only with LukF-PV molecules bound after addition of LukS-PV. LukF-PV and LukD competed with HlgB in the presence of LukS-PV on PMNs and monocytes. Use of antibodies and comparisons between binding and activity time courses showed that the LukF-PV molecules that bound to target cells before addition of LukS-PV were the only LukF-PV molecules responsible for Ca(2+) entry and pore formation. In contrast, the active HlgB molecules were the HlgB molecules bound after addition of LukS-PV. In conclusion, LukF-PV must be linked to LukS-PV and to a binding site of the membrane to have toxin activity.
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29
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Diep BA, Palazzolo-Ballance AM, Tattevin P, Basuino L, Braughton KR, Whitney AR, Chen L, Kreiswirth BN, Otto M, DeLeo FR, Chambers HF. Contribution of Panton-Valentine leukocidin in community-associated methicillin-resistant Staphylococcus aureus pathogenesis. PLoS One 2008; 3:e3198. [PMID: 18787708 PMCID: PMC2527530 DOI: 10.1371/journal.pone.0003198] [Citation(s) in RCA: 147] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2008] [Accepted: 08/22/2008] [Indexed: 11/20/2022] Open
Abstract
Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) strains typically carry genes encoding Panton-Valentine leukocidin (PVL). We used wild-type parental and isogenic PVL-deletion (Δpvl) strains of USA300 (LAC and SF8300) and USA400 (MW2) to test whether PVL alters global gene regulatory networks and contributes to pathogenesis of bacteremia, a hallmark feature of invasive staphylococcal disease. Microarray and proteomic analyses revealed that PVL does not alter gene or protein expression, thereby demonstrating that any contribution of PVL to CA-MRSA pathogenesis is not mediated through interference of global gene regulatory networks. Inasmuch as a direct role for PVL in CA-MRSA pathogenesis remains to be determined, we developed a rabbit bacteremia model of CA-MRSA infection to evaluate the effects of PVL. Following experimental infection of rabbits, an animal species whose granulocytes are more sensitive to the effects of PVL compared with the mouse, we found a contribution of PVL to pathogenesis over the time course of bacteremia. At 24 and 48 hours post infection, PVL appears to play a modest, but measurable role in pathogenesis during the early stages of bacteremic seeding of the kidney, the target organ from which bacteria were not cleared. However, the early survival advantage of this USA300 strain conferred by PVL was lost by 72 hours post infection. These data are consistent with the clinical presentation of rapid-onset, fulminant infection that has been associated with PVL-positive CA-MRSA strains. Taken together, our data indicate a modest and transient positive effect of PVL in the acute phase of bacteremia, thereby providing evidence that PVL contributes to CA-MRSA pathogenesis.
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Affiliation(s)
- Binh An Diep
- Division of Infectious Diseases, Department of Medicine, San Francisco General Hospital, University of California San Francisco, San Francisco, California, United States of America
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Valeva A, Walev I, Weis S, Boukhallouk F, Wassenaar TM, Bhakdi S. Pro-inflammatory feedback activation cycle evoked by attack of Vibrio cholerae cytolysin on human neutrophil granulocytes. Med Microbiol Immunol 2007; 197:285-93. [PMID: 17882454 DOI: 10.1007/s00430-007-0061-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2007] [Indexed: 11/28/2022]
Abstract
Vibrio cholerae cytolysin (VCC) is a pore-forming toxin that is secreted in precursor form (pro-VCC) and requires proteolytic cleavage in order to attain membrane-permeabilizing properties. Pro-VCC can be activated both in solution and membrane-bound state. Processing of membrane-bound pro-VCC can in turn be achieved through the action of both cell-associated and soluble proteases. The current investigation describes the interaction of VCC with human neutrophil granulocytes. It is shown that pro-VCC binds to these cells and is cleaved by cell-bound serine proteases. Membrane permeabilization leads to granulocyte activation, as witnessed by the generation of reactive oxygen metabolites and liberation of granule constituents. A mutant toxin with unaltered binding properties but devoid of pore-forming activity did not elicit these effects. The secreted proteases cleave and activate further bound- and non-bound pro-VCC. A positive feedback loop is thus created that results in enhanced cytotoxicity towards both the targeted granulocytes and towards bystander cells that are not primarily killed by the protoxin. Thus, activation of neutrophil granulocytes by VCC fuels a positive feedback cycle that will cripple immune defence, augment inflammation, and enhance the cytotoxic action of the toxin on neighbouring tissue cells.
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Affiliation(s)
- Angela Valeva
- Institute of Medical Microbiology and Hygiene, University of Mainz, Augustusplatz, Mainz, Germany.
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31
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Paraje MG, Eraso AJ, Albesa I. Pore formation, polymerization, hemolytic and leukotoxic effects of a new Enterobacter cloacae toxin neutralized by antiserum. Microbiol Res 2005; 160:203-11. [PMID: 15881838 DOI: 10.1016/j.micres.2005.01.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new toxin of Enterobacter cloacae was purified and studied by SDS-PAGE electrophoresis with the purpose of investigating its ability to generate polymers and their molecular mass. Monomer of 13.3 kDa and structures of multimeric mass were detected. The toxin of 66 kDa was the most abundant form of toxin. This polymer and the monomer were selected to examine blood cells damage. Membrane pores caused by both toxin forms seemed to be of similar dimension (estimated in 3.6 nm by experiments with osmotic protectors) and were able to lyse erythrocytes and leukocytes. The results obtained indicate that polymerization and pore formation are involved in the molecular events that participate in the cytotoxic effects of E. cloacae toxin. Immunization of rabbits with 13.3kDa toxin generated antibody response capable of inhibiting oxidative stress as well as hemolytic and leukotoxic effects. Immunoblotting indicated that monomer and polymer reacted with antihemolysin serum. The importance of E. cloacae toxin "in vivo" was studied in animals by means of assays performed in peritoneum of rats, inoculated with the hemolytic strain (C1) and a non-hemolytic variant (C4). Both strains stimulated infiltration of leukocytes in peritoneum, but C1 caused cell death and lysis wheras assays with C4 maintained the viability of leukocytes even within 5 h after extraction of samples.
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Affiliation(s)
- María Gabriela Paraje
- Departamento de Farmacia, Facultad de Ciencias Quimicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina.
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32
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Huang MT, Ghai G, Ho CT. Inflammatory Process and Molecular Targets for Antiinflammatory Nutraceuticals. Compr Rev Food Sci Food Saf 2004; 3:127-139. [DOI: 10.1111/j.1541-4337.2004.tb00063.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Guillet V, Roblin P, Werner S, Coraiola M, Menestrina G, Monteil H, Prévost G, Mourey L. Crystal Structure of Leucotoxin S Component. J Biol Chem 2004; 279:41028-37. [PMID: 15262988 DOI: 10.1074/jbc.m406904200] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Staphylococcal leucocidins and gamma-hemolysins (leucotoxins) are bi-component toxins that form lytic transmembrane pores. Their cytotoxic activities require the synergistic association of a class S component and a class F component, produced as water-soluble monomers that form hetero-oligomeric membrane-associated complexes. Strains that produce the Panton-Valentine leucocidin are clinically associated with cutaneous lesions and community-acquired pneumonia. In a previous study, we determined the crystal structure of the F monomer from the Panton-Valentine leucocidin. To derive information on the second component of the leucotoxins, the x-ray structure of the S protein from the Panton-Valentine leucocidin was solved to 2.0 angstrom resolution using a tetragonal crystal form that contains eight molecules in the asymmetric unit. The structure demonstrates the different conformation of the domain involved in membrane contacts and illustrates sequence and tertiary structure variabilities of the pore-forming leucotoxins. Mutagenesis studies at a key surface residue (Thr-28) further support the important role played by these microheterogeneities for the assembly of the bipartite leucotoxins.
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Affiliation(s)
- Valérie Guillet
- Groupe de Biophysique Structurale, Département Mécanismes Moléculaires des Infections Mycobactériennes, CNRS-IPBS, 205 route de Narbonne, 31077 Toulouse Cedex, France
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Cockeran R, Theron AJ, Feldman C, Mitchel TJ, Anderson R. Pneumolysin potentiates oxidative inactivation of alpha-1-proteinase inhibitor by activated human neutrophils. Respir Med 2004; 98:865-71. [PMID: 15338799 DOI: 10.1016/j.rmed.2004.02.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study was designed to investigate the effects of the Streptococcus pneumoniae-derived, pro-inflammatory toxin, pneumolysin (8.37 and 41.75 ng/ml), on the oxidative inactivation of alpha-1-protease inhibitor (API) by chemoattractant-activated human neutrophils in vitro. The elastase inhibitory capacity (EIC) of API in supernatants from unstimulated neutrophils, neutrophils treated with pneumolysin only, or with the chemoattractant FMLP (1 microM) only, or the combination of the toxin with FMLP was measured by a colorimetric procedure based on the activity of added porcine elastase. The EIC of API was unaffected by exposure to pneumolysin only, unstimulated neutrophils, or neutrophils treated with pneumolysin only. However, exposure to FMLP-activated neutrophils resulted in a reduction of the EIC of API, which was significantly (P<0.05) augmented by pneumolysin (mean reductions of 16%, 43% and 83% for FMLP only and in combination with 8.37 and 41.75 ng/ml pneumolysin, respectively), and was attenuated by wortmannin (1 microM), an inhibitor of NADPH oxidase, the oxidant-scavenger methionine (100 microM), and depletion of Ca2+ from the cell-suspending medium. These pro-proteolytic interactions of pneumolysin with chemoattractant-activated neutrophils may contribute to the invasiveness of the pneumococcus.
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Affiliation(s)
- Riana Cockeran
- MRC Unit for Inflammation and Immunity, Department of Immunology, Faculty of Health Sciences, University of Pretoria and Tshwane Academic Division of the National Health Laboratory Services, PO Box 2034, Pretoria 0001, South Africa
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