1
|
Ring HC, Thorsen J, Fuursted K, Bjarnsholt T, Bay L, Egeberg A, Ingham AC, Vedel Nielsen H, Frew WJ, Saunte D, Thomsen SF, Jemec GB. Amplicon sequencing demonstrates comparable follicular mycobiomes in patients with hidradenitis suppurativa compared with healthy controls. J Eur Acad Dermatol Venereol 2022; 36:e580-e583. [PMID: 35285081 DOI: 10.1111/jdv.18075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 03/02/2022] [Indexed: 11/28/2022]
Affiliation(s)
- H C Ring
- Department of Dermato-Venereology & Wound Healing Centre, Bispebjerg Hospital and Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Dermatology, Zealand University Hospital, Roskilde, Denmark
| | - J Thorsen
- COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark.,Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - K Fuursted
- Department of microbiology and infection control, Statens Serum Institut, Copenhagen, Denmark
| | - T Bjarnsholt
- Costerton Biofilm Center, University of Copenhagen, Denmark.,Department of Clinical Microbiology, Copenhagen University Hospital, Copenhagen, Denmark
| | - L Bay
- Costerton Biofilm Center, University of Copenhagen, Denmark
| | - A Egeberg
- Department of Dermato-Venereology & Wound Healing Centre, Bispebjerg Hospital and Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - A C Ingham
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - H Vedel Nielsen
- Department of microbiology and infection control, Statens Serum Institut, Copenhagen, Denmark.,Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - W J Frew
- Department of Dermatology, Liverpool Hospital, Sydney, Australia
| | - Dml Saunte
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark.,Department of Dermatology, Zealand University Hospital, Roskilde, Denmark.,Department of Clinical Medicine, Faculthy of Health and Medical Science, University of Copenhagen, Copenhagen, Denmark
| | - S F Thomsen
- Department of Dermato-Venereology & Wound Healing Centre, Bispebjerg Hospital and Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - G B Jemec
- Department of Dermatology, Zealand University Hospital, Roskilde, Denmark.,Department of Clinical Medicine, Faculthy of Health and Medical Science, University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
2
|
Ring HC, Thorsen J, Fuursted K, Bjarnsholt T, Bay L, Saunte DM, Thomsen SF, Jemec GB. Probiotics in hidradenitis suppurativa: a potential treatment option? Clin Exp Dermatol 2021; 47:139-141. [PMID: 34236727 DOI: 10.1111/ced.14838] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Accepted: 07/06/2021] [Indexed: 01/15/2023]
Affiliation(s)
- H C Ring
- Department of Dermato-Venereology and Wound Healing Centre, Bispebjerg Hospital and Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - J Thorsen
- COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark.,Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - K Fuursted
- Department of Microbiology and Infection Control, Statens Serum Institut, Copenhagen, Denmark
| | - T Bjarnsholt
- Costerton Biofilm Center, University of Copenhagen, Denmark.,Department of Clinical Microbiology, Copenhagen University Hospital, Copenhagen, Denmark
| | - L Bay
- Costerton Biofilm Center, University of Copenhagen, Denmark
| | - D M Saunte
- Department of Dermatology, Faculty of Health and Medical Sciences, Zealand University Hospital, University of Copenhagen, Copenhagen, Denmark
| | - S F Thomsen
- Department of Dermato-Venereology and Wound Healing Centre, Bispebjerg Hospital and Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - G B Jemec
- Department of Dermatology, Faculty of Health and Medical Sciences, Zealand University Hospital, University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
3
|
Stewart PS, Bjarnsholt T. Risk factors for chronic biofilm-related infection associated with implanted medical devices. Clin Microbiol Infect 2020; 26:1034-1038. [PMID: 32120041 DOI: 10.1016/j.cmi.2020.02.027] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/20/2020] [Accepted: 02/22/2020] [Indexed: 11/15/2022]
Abstract
BACKGROUND The use of implanted medical devices is associated with a small but clinically important risk of foreign body infection. A key question is: why do some patients develop chronic infection associated with an implanted device, but most do not? AIMS The literature on patient-specific risk factors for chronic infections associated with five types of implants was surveyed to glean clues about the etiology of these infections. SOURCES Data were collected from 47 articles through calendar year 2017 for five categories of device-related infections: cardiovascular implantable electronic devices (CIEDs), hernia meshes, prosthetic hip and knee joints, prosthetic shoulder joints and breast implants. CONTENT Important risk factors include immunomodulation/steroid therapy, diabetes, smoking, and renal disease/haemodialysis-findings that point to a critical role of a compromised innate immune response in determining vulnerable subpopulations. IMPLICATIONS A model of biofilm-related device infection is presented that posits defects in the innate immune response both systemically and locally, in the immediate vicinity of an abiotic biomaterial. The limitations of in vitro and animal models of chronic device-related infections are discussed in this context as are implications for research and clinical practice.
Collapse
Affiliation(s)
- P S Stewart
- Center for Biofilm Engineering, Montana State University, Bozeman, MT, USA; Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT, USA.
| | - T Bjarnsholt
- Costerton Biofilm Center, Department of International Health, Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark; Department of Immunology and Microbiology, Rigshospitalet, Copenhagen, Denmark
| |
Collapse
|
4
|
Schwarzer S, James GA, Goeres D, Bjarnsholt T, Vickery K, Percival SL, Stoodley P, Schultz G, Jensen SO, Malone M. The efficacy of topical agents used in wounds for managing chronic biofilm infections: A systematic review. J Infect 2019; 80:261-270. [PMID: 31899281 DOI: 10.1016/j.jinf.2019.12.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 12/18/2019] [Accepted: 12/24/2019] [Indexed: 12/19/2022]
Abstract
OBJECTIVES Clinicians have increasingly adopted the widespread use of topical agents to manage chronic wound infections, despite limited data on their effectiveness in vivo. This study sought to evaluate the evidence for commonly employed topical agents used in wounds for the purpose of treating chronic infections caused by biofilm. METHOD We included in vitro, animal and human in vivo studies where topical agents were tested for their efficacy against biofilms, for use in wound care. For human studies, we only included those which utilised appropriate identification techniques for visualising and confirming the presence of biofilms. RESULT A total of 640 articles were identified, with 43 included after meeting eligibility. In vitro testing accounted for 90% (n = 39) of all included studies, five studies using animal models and three human in vivo studies. Sixteen different laboratory models were utilised, with the most frequent being the minimum biofilm eradication concentration (MBEC™) / well plate assay (38%, n = 15 of 39). A total of 44 commercially available topical agents were grouped into twelve categories with the most commonly tested agents being silver, iodine and polyhexamethylene biguanide (PHMB). In vitro results on efficacy demonstrated iodine as having the highest mean log10 reductions of all agents (4.81, ±3.14). CONCLUSION There is large disparity in the translation of laboratory studies to researchers undertaking human trials relating to the effectiveness of commercially available topical agents. There is insufficient human in vivo evidence to definitively recommend any commercially available topical agent over another for the treatment of chronic wound biofilms. The heterogeneity identified between study designs (in vitro to in vivo) further limits the generalisability of results.
Collapse
Affiliation(s)
- S Schwarzer
- South West Sydney Limb Preservation and Wound Research, South West Sydney Local Health District, Sydney, Australia.
| | - G A James
- Centre for Biofilm Engineering, Montana State University, Bozeman, MT, United States
| | - D Goeres
- Centre for Biofilm Engineering, Montana State University, Bozeman, MT, United States
| | - T Bjarnsholt
- Department of Immunology and Microbiology, Costerton Biofilm Centre, University of Copenhagen, Copenhagen, Denmark; Department of Clinical Microbiology, Copenhagen University Hospital, Copenhagen, Denmark
| | - K Vickery
- Surgical Infection Research Group, Faculty of Medicine and Health Sciences, Macquarie University, Sydney Australia
| | - S L Percival
- 5D Health Protection Group Ltd, Centre of Excellence in Biofilm Science (CEBS), Liverpool Bio-Innovation Hub, Liverpool UK
| | - P Stoodley
- Departments of Microbial Infection and Immunity, and Orthopaedics, Ohio State University, Columbus, OH, United States
| | - G Schultz
- Department of Obstetrics & Gynecology, Institute for Wound Research, University of Florida, Gainesville, FL, United States
| | - S O Jensen
- South West Sydney Limb Preservation and Wound Research, South West Sydney Local Health District, Sydney, Australia; Infectious Diseases and Microbiology, School of Medicine, Ingham Institute for Applied Medical Research, Western Sydney University, United States
| | - M Malone
- South West Sydney Limb Preservation and Wound Research, South West Sydney Local Health District, Sydney, Australia; Infectious Diseases and Microbiology, School of Medicine, Ingham Institute for Applied Medical Research, Western Sydney University, United States
| |
Collapse
|
5
|
Jensen P, Møller S, Lerche C, Moser C, Bjarnsholt T, Ciofu O, Faurholt-Jepsen D, Høiby N, Kolpen M. Improving antibiotic treatment of bacterial biofilm by hyperbaric oxygen therapy: Not just hot air. Biofilm 2019; 1:100008. [PMID: 33447795 PMCID: PMC7798444 DOI: 10.1016/j.bioflm.2019.100008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 10/26/2022] Open
Abstract
Bacteria and fungi show substantial increased recalcitrance when growing as infectious biofilms. Chronic infections caused by biofilm growing microorganisms is considered a major problem of modern medicine. New strategies are needed to improve antibiotic treatment of biofilms. We have improved antibiotic treatment of bacterial biofilms by reviving the dormant bacteria and thereby make them susceptible to antibiotics by means of reoxygenation. Here we review the rationale for associating lack of oxygen with low susceptibility in infectious biofilm, and how hyperbaric oxygen therapy may result in reoxygenation leading to enhanced bactericidal activity of antibiotics. We address issues of feasibility and potential adverse effects regarding patient safety and development of resistance. Finally, we propose means for supplying reoxygenation to antibiotic treatment of infectious biofilm with the potential to benefit large groups of patients.
Collapse
Affiliation(s)
- P.Ø. Jensen
- Department of Clinical Microbiology, Rigshospitalet, 2100, Copenhagen, Denmark
- Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health Sciences University of Copenhagen, 2200, Copenhagen, Denmark
| | - S.A. Møller
- Department of Clinical Microbiology, Rigshospitalet, 2100, Copenhagen, Denmark
| | - C.J. Lerche
- Department of Clinical Microbiology, Rigshospitalet, 2100, Copenhagen, Denmark
| | - C. Moser
- Department of Clinical Microbiology, Rigshospitalet, 2100, Copenhagen, Denmark
| | - T. Bjarnsholt
- Department of Clinical Microbiology, Rigshospitalet, 2100, Copenhagen, Denmark
- Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health Sciences University of Copenhagen, 2200, Copenhagen, Denmark
| | - O. Ciofu
- Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health Sciences University of Copenhagen, 2200, Copenhagen, Denmark
| | - D. Faurholt-Jepsen
- Copenhagen Cystic Fibrosis Center, Department of Infectious Diseases, Rigshospitalet, Copenhagen University Hospital, Blegdamsvej 9, DK2100, Copenhagen, Denmark
| | - N. Høiby
- Department of Clinical Microbiology, Rigshospitalet, 2100, Copenhagen, Denmark
- Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health Sciences University of Copenhagen, 2200, Copenhagen, Denmark
| | - M. Kolpen
- Department of Clinical Microbiology, Rigshospitalet, 2100, Copenhagen, Denmark
| |
Collapse
|
6
|
Bjarnsholt T, Buhlin K, Dufrêne YF, Gomelsky M, Moroni A, Ramstedt M, Rumbaugh KP, Schulte T, Sun L, Åkerlund B, Römling U. Biofilm formation - what we can learn from recent developments. J Intern Med 2018; 284:332-345. [PMID: 29856510 PMCID: PMC6927207 DOI: 10.1111/joim.12782] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Although biofilms have been observed early in the history of microbial research, their impact has only recently been fully recognized. Biofilm infections, which contribute to up to 80% of human microbial infections, are associated with common human disorders, such as diabetes mellitus and poor dental hygiene, but also with medical implants. The associated chronic infections such as wound infections, dental caries and periodontitis significantly enhance morbidity, affect quality of life and can aid development of follow-up diseases such as cancer. Biofilm infections remain challenging to treat and antibiotic monotherapy is often insufficient, although some rediscovered traditional compounds have shown surprising efficiency. Innovative anti-biofilm strategies include application of anti-biofilm small molecules, intrinsic or external stimulation of production of reactive molecules, utilization of materials with antimicrobial properties and dispersion of biofilms by digestion of the extracellular matrix, also in combination with physical biofilm breakdown. Although basic principles of biofilm formation have been deciphered, the molecular understanding of the formation and structural organization of various types of biofilms has just begun to emerge. Basic studies of biofilm physiology have also resulted in an unexpected discovery of cyclic dinucleotide second messengers that are involved in interkingdom crosstalk via specific mammalian receptors. These findings even open up new venues for exploring novel anti-biofilm strategies.
Collapse
Affiliation(s)
- T Bjarnsholt
- Department of Immunology and Microbiology, Costerton Biofilm Centre, University of Copenhagen, Copenhagen, Denmark
- Department of Clinical Microbiology, Copenhagen University Hospital, Copenhagen, Denmark
| | - K Buhlin
- Department of Dental Medicine, Division of Oral Facial Diagnostics and Surgery, Karolinska Institutet, Huddinge, Sweden
| | - Y F Dufrêne
- Institute of Life Sciences, Université catholique de Louvain, Louvain-la-Neuve, Belgium
| | - M Gomelsky
- Department of Molecular Biology, University of Wyoming, Laramie, WY, USA
| | - A Moroni
- Department of Biology and CNR-Istituto di Biofisica, Università degli Studi di Milano, Milano, Italy
| | - M Ramstedt
- Department of Chemistry, Umeå University, Umeå, Sweden
| | - K P Rumbaugh
- Departments of Surgery & Immunology & Molecular Microbiology, Texas Tech University Health Sciences Center, Lubbock, TX, USA
| | - T Schulte
- Department of Medicine Solna, Science for Life Laboratory, Karolinska Institutet, Stockholm, Sweden
- Department of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden
| | - L Sun
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - B Åkerlund
- Department of Medicine Huddinge, Unit of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden
| | - U Römling
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| |
Collapse
|
7
|
Kolpen M, Ravnholt C, Qvist T, Kragh K, Fritz B, Johansen U, Bjarnsholt T, Jensen P, Høiby N. WS02.6 Improving antibiotic activity against Mycobacterium abscessus isolates by inducing bacterial disaggregation and oxygen availability. J Cyst Fibros 2018. [DOI: 10.1016/s1569-1993(18)30130-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
8
|
Johani K, Fritz BG, Bjarnsholt T, Lipsky BA, Jensen SO, Yang M, Dean A, Hu H, Vickery K, Malone M. Understanding the microbiome of diabetic foot osteomyelitis: insights from molecular and microscopic approaches. Clin Microbiol Infect 2018; 25:332-339. [PMID: 29787888 DOI: 10.1016/j.cmi.2018.04.036] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 04/30/2018] [Accepted: 04/30/2018] [Indexed: 01/13/2023]
Abstract
OBJECTIVES Rigorous visual evidence on whether or not biofilms are involved in diabetic foot osteomyelitis (DFO) is lacking. We employed a suite of molecular and microscopic approaches to investigate the microbiome, and phenotypic state of microorganisms involved in DFO. METHODS In 20 consecutive subjects with suspected DFO, we collected intraoperative bone specimens. To explore the microbial diversity present in infected bone we performed next generation DNA sequencing. We used scanning electron microscopy (SEM) and peptide nucleic acid fluorescent in situ hybridization (PNA-FISH) with confocal microscopy to visualize and confirm the presence of biofilms. RESULTS In 19 of 20 (95%) studied patients presenting with DFO, it was associated with an infected diabetic foot ulcer. By DNA sequencing of infected bone, Corynebacterium sp. was the most commonly identified microorganism, followed by Finegoldia sp., Staphylococcus sp., Streptococcus sp., Porphyromonas sp., and Anaerococcus sp. Six of 20 bone samples (30%) contained only one or two pathogens, while the remaining 14 (70%) had polymicrobial communities. Using a combination of SEM and PNA-FISH, we identified microbial aggregates in biofilms in 16 (80%) bone specimens and found that they were typically coccoid or rod-shaped aggregates. CONCLUSIONS The presence of biofilms in DFO may explain why non-surgical treatment of DFO, relying on systemic antibiotic therapy, may not resolve some chronic infections caused by biofilm-producing strains.
Collapse
Affiliation(s)
- K Johani
- Surgical Infection Research Group, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - B G Fritz
- University of Copenhagen, Faculty of Health and Medical Sciences, Department of Immunology and Microbiology, Costerton Biofilm Center, Denmark
| | - T Bjarnsholt
- University of Copenhagen, Faculty of Health and Medical Sciences, Department of Immunology and Microbiology, Costerton Biofilm Center, Denmark; Department of Clinical Microbiology, Rigshospitalet, Denmark
| | - B A Lipsky
- Oxford Microbiology and Infectious Diseases, University of Oxford, Oxford, UK
| | - S O Jensen
- Infectious Diseases and Microbiology, School of Medicine, Western Sydney University, Australia
| | - M Yang
- Liverpool Hospital, South Western Sydney LHD, Sydney, Australia
| | - A Dean
- Liverpool Hospital, South Western Sydney LHD, Sydney, Australia
| | - H Hu
- Surgical Infection Research Group, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - K Vickery
- Surgical Infection Research Group, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - M Malone
- Infectious Diseases and Microbiology, School of Medicine, Western Sydney University, Australia; Liverpool Hospital, South Western Sydney LHD, Sydney, Australia; Liverpool Diabetes Collaborative Research Unit, Ingham Institute of Applied Medical Research, Sydney, Australia.
| |
Collapse
|
9
|
Coenye T, Goeres D, Van Bambeke F, Bjarnsholt T. Should standardized susceptibility testing for microbial biofilms be introduced in clinical practice? Clin Microbiol Infect 2018; 24:570-572. [PMID: 29337253 DOI: 10.1016/j.cmi.2018.01.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 01/02/2018] [Accepted: 01/03/2018] [Indexed: 01/29/2023]
Affiliation(s)
- T Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium; ESCMID Study Group for Biofilms, Switzerland.
| | - D Goeres
- Center for Biofilm Engineering, Montana State University, Bozeman, MT, USA
| | - F Van Bambeke
- Pharmacologie cellulaire et moléculaire, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium; ESCMID PK/PD of Anti-Infectives Study Group, Switzerland
| | - T Bjarnsholt
- ESCMID Study Group for Biofilms, Switzerland; Department of Immunology and Microbiology, Costerton Biofilm Center, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
10
|
Ring HC, Thorsen J, Saunte DM, Lilje B, Bay L, Theut Riis P, Larsen N, O'Brien Andersen L, Vedel Nielsen H, Miller IM, Bjarnsholt T, Fuursted K, Jemec GB. Moderate to severe hidradenitis suppurativa patients do not have an altered bacterial composition in peripheral blood compared to healthy controls. J Eur Acad Dermatol Venereol 2017; 32:125-128. [PMID: 28833590 DOI: 10.1111/jdv.14538] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 07/21/2017] [Indexed: 12/29/2022]
Abstract
BACKGROUND Hidradenitis suppurativa (HS) is a chronic inflammatory skin disease defined by recurrent nodules, tunnels and scarring involving the intertriginous skin. Patients with HS often report an array of systemic symptoms such as fatigue and malaise. The aetiology of these symptoms remains unclear. Previously, various bacteria have been associated with mature HS lesions, and bacteraemia has been reported in patients with HS using traditional culturing methods. Thus, we hypothesized that a low-grade bacteraemia contributes to the symptomatology in patients with HS. OBJECTIVE To explore the potential presence of bacteraemia in patients with HS and healthy controls. METHOD A case-control study. Compositions of bacteria in the blood of 27 moderate to severe HS patients and 26 healthy controls were investigated using next-generation 16S ribosomal RNA gene sequencing (NGS) and routine anaerobic and aerobic blood culturing. None of the participants received any antibiotics (systemic or topical therapy) within 1 month prior to the study. HS patients with a recent flare were randomly selected by consecutive recruitment of eligible patients from the Department of Dermatology, Zealand University Hospital, Denmark. Healthy controls were recruited from the University of Copenhagen as well as from the healthcare staff. RESULTS The different bacterial compositions were investigated using NGS and traditional anaerobic and aerobic blood culturing. Our NGS analysis provided a previously unreported characterization of the bacterial composition in peripheral blood from patients with HS and healthy controls. Overall, our data demonstrated that patients with HS do not have a different bacterial composition in their peripheral blood than healthy controls. CONCLUSION The study suggests that the self-reported symptoms in HS such as malaise and fatigue may not be linked to bacteraemia.
Collapse
Affiliation(s)
- H C Ring
- Department of Dermatology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| | - J Thorsen
- COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark
| | - D M Saunte
- Department of Dermatology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| | - B Lilje
- Department of Microbiology and Infection Control, Statens Serum Institut, Copenhagen, Denmark
| | - L Bay
- Costerton Biofilm Center, University of Copenhagen, Copenhagen, Denmark
| | - P Theut Riis
- Department of Dermatology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| | - N Larsen
- Danish Genome Institute, Aarhus, Denmark
| | - L O'Brien Andersen
- Department of Microbiology and Infection Control, Statens Serum Institut, Copenhagen, Denmark
| | - H Vedel Nielsen
- Department of Microbiology and Infection Control, Statens Serum Institut, Copenhagen, Denmark
| | - I M Miller
- Department of Dermatology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| | - T Bjarnsholt
- Costerton Biofilm Center, University of Copenhagen, Copenhagen, Denmark
| | - K Fuursted
- Department of Microbiology and Infection Control, Statens Serum Institut, Copenhagen, Denmark
| | - G B Jemec
- Department of Dermatology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| |
Collapse
|
11
|
Jørgensen E, Bay L, Bjarnsholt T, Bundgaard L, Sørensen MA, Jacobsen S. The occurrence of biofilm in an equine experimental wound model of healing by secondary intention. Vet Microbiol 2017; 204:90-95. [PMID: 28532812 DOI: 10.1016/j.vetmic.2017.03.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 03/03/2017] [Accepted: 03/08/2017] [Indexed: 11/28/2022]
Abstract
In humans, biofilm is a well-known cause of delayed healing and low-grade inflammation of chronic wounds. In horses, biofilm formation in wounds has been studied to a very limited degree. The objective of this study was thus to investigate the occurrence of biofilm in equine experimental wounds healing by secondary intention. Tissue biopsies from non-contaminated, experimental excisional shoulder and limb wounds were obtained on day 1-2, day 7-10 and day 14-15 post-wounding. Limb wounds were either un-bandaged or bandaged to induce exuberant granulation tissue (EGT) formation and thereby impaired healing. Presence of biofilm in tissue biopsies was assessed by peptide nucleic acid fluorescence in situ hybridization (PNA FISH) and confocal laser scanning microscopy (CLSM). Bandaged limb wounds developed EGT and displayed delayed healing, while shoulder and un-bandaged limb wounds healed normally. Biofilm was detected in limb wounds only. At day 14-15 biofilm was significantly more prevalent in bandaged limb wounds than in un-bandaged limb wounds (P=0.003). Further, bandaged limb wounds had a statistically significant increase in biofilm burden from day 7-10 to day 14-15 (P=0.009). The finding that biofilm was most prevalent in bandaged limb wounds with EGT formation suggests that biofilm may be linked to delayed wound healing in horses, as has been observed in humans. The inability to clear bacteria could be related to hypoxia and low-grade inflammation in the EGT, but the interaction between biofilm forming bacteria and wound healing in horses needs further elucidation.
Collapse
Affiliation(s)
- E Jørgensen
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Højbakkegaard Allé 5, DK-2630 Taastrup, Denmark.
| | - L Bay
- Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen N, Denmark.
| | - T Bjarnsholt
- Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen N, Denmark; Department of Clinical Microbiology, Juliane Maries Vej 22, 2100 Copenhagen Ø, Rigshospitalet, Denmark.
| | - L Bundgaard
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Højbakkegaard Allé 5, DK-2630 Taastrup, Denmark.
| | - M A Sørensen
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Højbakkegaard Allé 5, DK-2630 Taastrup, Denmark.
| | - S Jacobsen
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Højbakkegaard Allé 5, DK-2630 Taastrup, Denmark.
| |
Collapse
|
12
|
Ring HC, Bay L, Nilsson M, Kallenbach K, Miller IM, Saunte DM, Bjarnsholt T, Tolker-Nielsen T, Jemec GB. Bacterial biofilm in chronic lesions of hidradenitis suppurativa. Br J Dermatol 2017; 176:993-1000. [PMID: 27564400 DOI: 10.1111/bjd.15007] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/21/2016] [Indexed: 12/20/2022]
Abstract
BACKGROUND Chronic nonhealing or recurrent inflammatory lesions, reminiscent of infection but recalcitrant to antibiotic therapy, generally characterize biofilm-driven diseases. Chronic lesions of hidradenitis suppurativa (HS) exhibit several characteristics, which are compatible with well-known biofilm infections. OBJECTIVES To determine and quantify the potential presence of bacterial aggregates in chronic HS lesions. METHODS In 42 consecutive patients with HS suffering from chronic lesions, biopsies were obtained from lesional as well as from perilesional skin. Samples were investigated using peptide nucleic acid-fluorescence in situ hybridization in combination with confocal laser scanning microscopy. In addition, corresponding histopathological analysis on haematoxylin and eosin slides was performed. RESULTS Biofilms were seen in 67% of the samples of chronic lesions and in 75% of the perilesional samples. The mean diameter of aggregates in lesional skin was significantly greater than in perilesional skin (P = 0·01). Large biofilms (aggregates > 50 μm in diameter) were found in 42% of lesional samples and in only 5% of the perilesional samples (P = 0·009). The majority of the large biofilms were situated in sinus tracts (63%) or in the infundibulum (37%). The majority of the sinus tract samples (73%) contained active bacterial cells, which were associated with inflammation. CONCLUSIONS This study suggests that biofilm formation is associated with inflammation of chronic HS lesions. The aggregates most likely occur as a secondary event, possibly due to predisposing local anatomical changes such as sinus tracts (tunnels), keratinous detritus and dilated hair follicles.
Collapse
Affiliation(s)
- H C Ring
- Department of Dermatology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| | - L Bay
- Department of Immunology and Microbiology, Costerton Biofilm Centre, University of Copenhagen, Denmark
| | - M Nilsson
- Department of Immunology and Microbiology, Costerton Biofilm Centre, University of Copenhagen, Denmark
| | - K Kallenbach
- Department of Pathology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| | - I M Miller
- Department of Dermatology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| | - D M Saunte
- Department of Dermatology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| | - T Bjarnsholt
- Department of Immunology and Microbiology, Costerton Biofilm Centre, University of Copenhagen, Denmark.,Department for Clinical Microbiology, Section 9301, Copenhagen University Hospital, Denmark
| | - T Tolker-Nielsen
- Department of Immunology and Microbiology, Costerton Biofilm Centre, University of Copenhagen, Denmark
| | - G B Jemec
- Department of Dermatology, Zealand University Hospital, Health Sciences Faculty, University of Copenhagen, Roskilde, Denmark
| |
Collapse
|
13
|
Malone M, Bjarnsholt T, McBain A, James G, Stoodley P, Leaper D, Tachi M, Schultz G, Swanson T, Wolcott R. The prevalence of biofilms in chronic wounds: a systematic review and meta-analysis of published data. J Wound Care 2017; 26:20-25. [DOI: 10.12968/jowc.2017.26.1.20] [Citation(s) in RCA: 255] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- M. Malone
- Head of Department, Podiatric Medicine, Global Wound Biofilm Expert Panel; Liverpool Hospital, South West Sydney LHD, Australia; and Ingham Institute of Applied Medical Research, Sydney, Australia
| | - T. Bjarnsholt
- University of Copenhagen, Costerton Biofilm Center, Denmark; and Department of Clinical Microbiology, Rigshospitalet, Denmark
| | - A.J. McBain
- Faculty of Biology, Medicine and Health, University of Manchester
| | - G.A. James
- Center for Biofilm Engineering, Montana State University, US
| | - P. Stoodley
- Center for Microbial Interface Biology and Department of Microbial infection, Immunity and Orthopaedics, Ohio State University, US
| | - D. Leaper
- Institute of Skin Integrity and Infection Prevention, University of Huddersfield, UK; and Imperial College, London, UK
| | - M. Tachi
- Tohoku University Graduate School of Medicine, Sendai, Japan
| | - G. Schultz
- Institute of Wound Research, Department of Obstetrics and Gynecology, College of Medicine, University of Florida
| | - T. Swanson
- South West Healthcare, Warrnambool, Victoria, Australia
| | - R.D. Wolcott
- Southwest Regional Wound Care Centre, Lubbock Texas, US
| |
Collapse
|
14
|
Kvich L, Jensen PØ, Justesen US, Bjarnsholt T. Incidence of Propionibacterium acnes in initially culture-negative thioglycollate broths-a prospective cohort study at a Danish University Hospital. Clin Microbiol Infect 2016; 22:941-945. [PMID: 27521804 DOI: 10.1016/j.cmi.2016.07.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 07/08/2016] [Accepted: 07/31/2016] [Indexed: 11/19/2022]
Abstract
The aim of this study was to prospectively investigate the incidence of Propionibacterium acnes in thioglycollate broths reported as culture-negative at the Department of Clinical Microbiology, Rigshospitalet, to evaluate whether 5 days of incubation was enough to find all relevant cases. Five hundred thioglycollate broths reported as culture-negative after 5 days were consecutively collected and incubated for at least a further 9 days (at least 14 days of incubation in total). Only tissue samples from sterile sites of the body (n = 298), bone tissue (n = 197) and foreign material (n = 5) were included in this study. Samples were divided into two groups: infected group and control group. This made it possible to compare findings between groups, thereby making it possible to estimate the level of true-positive findings and contamination. Samples from 296 participants were included in this study. After exclusion criteria were met, P. acnes was cultured from ten out of 151 patients (6.6%) in the infected group and from one out of 138 participants (0.7%) in the control group. This resulted in more findings of P. acnes in the infected group on day 14 than on day 5 (p 0.002). Furthermore, P. acnes was cultured more often from bone tissue and tissue surrounding foreign materials on day 14 than on day 5 (p 0.04). Clinical microbiology laboratories should consider incubating thioglycollate broths for at least 14 days to find all relevant cases of P. acnes, especially when it comes to bone tissue and tissue surrounding foreign materials.
Collapse
Affiliation(s)
- L Kvich
- Department of Clinical Microbiology, Copenhagen University Hospital-Rigshospitalet, Denmark
| | - P Ø Jensen
- Department of Clinical Microbiology, Copenhagen University Hospital-Rigshospitalet, Denmark
| | - U S Justesen
- Department of Clinical Microbiology, Copenhagen University Hospital-Rigshospitalet, Denmark
| | - T Bjarnsholt
- Department of Clinical Microbiology, Copenhagen University Hospital-Rigshospitalet, Denmark; Department of International Health, Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark.
| |
Collapse
|
15
|
Thomsen K, Christophersen L, Bjarnsholt T, Jensen PØ, Moser C, Høiby N. Anti-Pseudomonas aeruginosa IgY Antibodies Induce Specific Bacterial Aggregation and Internalization in Human Polymorphonuclear Neutrophils. Infect Immun 2015; 83:2686-93. [PMID: 25895968 PMCID: PMC4468541 DOI: 10.1128/iai.02970-14] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Accepted: 04/10/2015] [Indexed: 01/24/2023] Open
Abstract
Polymorphonuclear neutrophils (PMNs) are essential cellular constituents in the innate host response, and their recruitment to the lungs and subsequent ubiquitous phagocytosis controls primary respiratory infection. Cystic fibrosis pulmonary disease is characterized by progressive pulmonary decline governed by a persistent, exaggerated inflammatory response dominated by PMNs. The principal contributor is chronic Pseudomonas aeruginosa biofilm infection, which attracts and activates PMNs and thereby is responsible for the continuing inflammation. Strategies to prevent initial airway colonization with P. aeruginosa by augmenting the phagocytic competence of PMNs may postpone the deteriorating chronic biofilm infection. Anti-P. aeruginosa IgY antibodies significantly increase the PMN-mediated respiratory burst and subsequent bacterial killing of P. aeruginosa in vitro. The mode of action is attributed to IgY-facilitated formation of immobilized bacteria in aggregates, as visualized by fluorescence microscopy and the induction of increased bacterial hydrophobicity. Thus, the present study demonstrates that avian egg yolk immunoglobulins (IgY) targeting P. aeruginosa modify bacterial fitness, which enhances bacterial killing by PMN-mediated phagocytosis and thereby may facilitate a rapid bacterial clearance in airways of people with cystic fibrosis.
Collapse
Affiliation(s)
- K Thomsen
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - L Christophersen
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - T Bjarnsholt
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark Department of International Health, Immunology and Microbiology, Faculty of Health Sciences University of Copenhagen, Copenhagen, Denmark
| | - P Ø Jensen
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - C Moser
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - N Høiby
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark Department of International Health, Immunology and Microbiology, Faculty of Health Sciences University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
16
|
Kolpen M, Appeldorff C, Brandt S, Mousavi N, Kragh K, Bjarnsholt T, Ciofu O, Høiby N, Jensen P. WS02.6 Increased bactericidal activity of colistin on Pseudomonas aeruginosa biofilms in anaerobic conditions. J Cyst Fibros 2015. [DOI: 10.1016/s1569-1993(15)30012-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
17
|
Høiby N, Bjarnsholt T, Moser C, Bassi G, Coenye T, Donelli G, Hall-Stoodley L, Holá V, Imbert C, Kirketerp-Møller K, Lebeaux D, Oliver A, Ullmann A, Williams C. ESCMID∗ guideline for the diagnosis and treatment of biofilm infections 2014. Clin Microbiol Infect 2015; 21 Suppl 1:S1-25. [DOI: 10.1016/j.cmi.2014.10.024] [Citation(s) in RCA: 451] [Impact Index Per Article: 50.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 10/14/2014] [Accepted: 10/14/2014] [Indexed: 01/22/2023]
|
18
|
Abstract
Following confirmation of the presence of biofilms in chronic wounds, the term biofilm became a buzzword within the wound healing community. For more than a century pathogens have been successfully isolated and identified from wound specimens using techniques that were devised in the nineteenth century by Louis Pasteur and Robert Koch. Although this approach still provides valuable information with which to help diagnose acute infections and to select appropriate antibiotic therapies, it is evident that those organisms isolated from clinical specimens with the conditions normally used in diagnostic laboratories are mainly in a planktonic form that is unrepresentative of the way in which most microbial species exist naturally. Usually microbial species adhere to each other, as well as to living and non-living surfaces, where they form complex communities surrounded by collectively secreted extracellular polymeric substances (EPS). Cells within such aggregations (or biofilms) display varying physiological and metabolic properties that are distinct from those of planktonic cells, and which contribute to their persistence. There are many factors that influence healing in wounds and the discovery of biofilms in chronic wounds has provided new insight into the reasons why. Increased tolerance of biofilms to antimicrobial agents explains the limited efficacy of antimicrobial agents in chronic wounds and illustrates the need to develop new management strategies. This review aims to explain the nature of biofilms, with a view to explaining their impact on wounds.
Collapse
Affiliation(s)
- R A Cooper
- Professor of Microbiology, Cardiff School of Health Sciences, Cardiff Metropolitan University, Western Avenue, Cardiff, CF5 2YB, S. Wales, UK
| | | | | |
Collapse
|
19
|
Crone S, Garde C, Bjarnsholt T, Alhede M. A novelin vitrowound biofilm model used to evaluate low-frequency ultrasonic-assisted wound debridement. J Wound Care 2015; 24:64, 66-9, 72. [DOI: 10.12968/jowc.2015.24.2.64] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- S. Crone
- Professor, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - C. Garde
- Technical University of Denmark. Anker Engelunds Vej 1, 2800 Kgs. Lyngby, Denmark
| | - T. Bjarnsholt
- Professor, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - M. Alhede
- Project Leader, emendo a/s, Sundkaj 7, 2100 Copenhagen, Denmark
| |
Collapse
|
20
|
Kolpen M, Bjarnsholt T, Moser C, Hansen CR, Rickelt LF, Kühl M, Hempel C, Pressler T, Høiby N, Jensen PØ. Nitric oxide production by polymorphonuclear leucocytes in infected cystic fibrosis sputum consumes oxygen. Clin Exp Immunol 2014; 177:310-9. [PMID: 24611476 DOI: 10.1111/cei.12318] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/03/2014] [Indexed: 11/30/2022] Open
Abstract
Chronic Pseudomonas aeruginosa lung infection in cystic fibrosis (CF) patients is characterized by persisting mucoid biofilms in hypoxic endobronchial mucus. These biofilms are surrounded by numerous polymorphonuclear leucocytes (PMNs), which consume a major part of present molecular oxygen (O(2)) due to production of superoxide (O(2)(-)). In this study, we show that the PMNs also consume O(2) for production of nitric oxide (NO) by the nitric oxide synthases (NOS) in the infected endobronchial mucus. Fresh expectorated sputum samples (n = 28) from chronically infected CF patients (n = 22) were analysed by quantifying and visualizing the NO production. NO production was detected by optode measurements combined with fluorescence microscopy, flow cytometry and spectrophotometry. Inhibition of nitric oxide synthases (NOS) with N(G) -monomethyl-L-arginine (L-NMMA) resulted in reduced O(2) consumption (P < 0·0008, n = 8) and a lower fraction of cells with fluorescence from the NO-indicator 4-amino-5-methylamino-2',7'-difluorofluorescein diacetate (DAF-FM) (P < 0·002, n = 8). PMNs stained with DAF-FM and the superoxide indicator hydroethidine (HE) and host cells with inducible NOS (iNOS) were identified in the sputum. In addition, the production of the stable end-products of NO in CF sputum was correlated with the concentration of PMNs; NO(3)(-) (P < 0·04, r = 0·66, n = 10) and NO(2)(-) (P< 0·006, r = 0·78, n = 11). The present study suggests that besides consumption of O(2) for production of reactive oxygen species, the PMNs in CF sputum also consume O(2) for production of NO.
Collapse
Affiliation(s)
- M Kolpen
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen, Denmark; Department of International Health, Immunology and Microbiology, Faculty of Health Sciences, University of Copenhagen, Helsingør, Denmark
| | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Thomsen K, Christophersen L, Moser C, Jensen P, Bjarnsholt T, Høiby N. 120 Anti-Pseudomonas aeruginosa IgY antibodies promote bacterial clearance in a murine pneumonia model. J Cyst Fibros 2014. [DOI: 10.1016/s1569-1993(14)60256-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
22
|
Kolpen M, Kühl M, Kragh K, Hansen C, Pressler T, Bjarnsholt T, Moser C, Høiby N, Jensen P. 117 Significance of oxygen depletion in chronic lung infections in cystic fibrosis patients. J Cyst Fibros 2014. [DOI: 10.1016/s1569-1993(14)60253-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
23
|
Cao B, Christophersen L, Thomsen K, Sønderholm M, Bjarnsholt T, Jensen PØ, Høiby N, Moser C. 63 Distribution of tobramycin and the impact on bacterial killing in a biofilm model. J Cyst Fibros 2014. [DOI: 10.1016/s1569-1993(14)60200-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
24
|
Hansen N, Rasmussen AKI, Fiandaca MJ, Kragh KN, Bjarnsholt T, Høiby N, Stender H, Guardabassi L. Rapid identification of Stenotrophomonas maltophilia by peptide nucleic acid fluorescence in situ hybridization. New Microbes New Infect 2014; 2:79-81. [PMID: 25356348 PMCID: PMC4184662 DOI: 10.1002/nmi2.38] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 12/21/2013] [Accepted: 01/14/2014] [Indexed: 12/03/2022] Open
Abstract
The objective of this study was to develop a novel peptide nucleic acid (PNA) probe for Stenotrophomonas maltophilia identification by fluorescence in situ hybridization (FISH). The probe was evaluated using 33 human and veterinary clinical S. maltophilia isolates and 45 reference strains representing common bacterial species in the respiratory tract. The probe displayed 100% sensitivity and 100% specificity on pure cultures and allowed detection in sputum from cystic fibrosis patients. The detection limit was 104 CFU/mL in spiked tracheal aspirate and bronchoalveolar lavage from healthy horses. Altogether the study shows that this species-specific PNA FISH probe facilitates rapid detection of S. maltophilia in biological specimens.
Collapse
Affiliation(s)
- N Hansen
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen Stigbøjlen, Frederiksberg, Denmark
| | | | | | - K N Kragh
- Department for International Health, Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen Copenhagen, Denmark
| | - T Bjarnsholt
- Department for Clinical Microbiology, University Hospital of Copenhagen Juliane Mariesvej, Copenhagen, Denmark ; Department for International Health, Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen Copenhagen, Denmark
| | - N Høiby
- Department for Clinical Microbiology, University Hospital of Copenhagen Juliane Mariesvej, Copenhagen, Denmark ; Department for International Health, Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen Copenhagen, Denmark
| | - H Stender
- Stender Diagnostics Gentofte, Denmark
| | - L Guardabassi
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen Stigbøjlen, Frederiksberg, Denmark
| |
Collapse
|
25
|
Gottrup F, Apelqvist J, Bjarnsholt T, Cooper R, Moore Z, Peters E, Probst S. EWMA Document: Antimicrobials and Non-healing Wounds: Evidence, controversies and suggestions. J Wound Care 2013; 22:S1-89. [DOI: 10.12968/jowc.2013.22.sup5.s1] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- F Gottrup
- Professor of Surgery, Bispebjerg University Hospital, Copenhagen, Denmark
| | - J Apelqvist
- Senior Consultant, Associate Professor, Skåne University Hospital, Malmö, Sweden
| | - T Bjarnsholt
- Associate Professor, University of Copenhagen and Copenhagen University Hospital, Copenhagen, Denmark
| | - R Cooper
- Professor of Microbiology, Cardiff Metropolitan University, Cardiff, Wales, United Kingdom
| | - Z Moore
- Lecturer in Wound Healing & Tissue Repair, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - E.J.G. Peters
- Internist- Infectious Diseases Specialist, VU University Medical Center, Amsterdam, the Netherlands
| | - S Probst
- Lecturer, Zurich University of Applied Sciences, Winterthur, Switzerland
| |
Collapse
|
26
|
Christophersen LJ, Trøstrup H, Malling Damlund DS, Bjarnsholt T, Thomsen K, Jensen PØ, Hougen HP, Høiby N, Moser C. Bead-size directed distribution of Pseudomonas aeruginosa results in distinct inflammatory response in a mouse model of chronic lung infection. Clin Exp Immunol 2013; 170:222-30. [PMID: 23039893 DOI: 10.1111/j.1365-2249.2012.04652.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Chronic Pseudomonas aeruginosa lung infection in cystic fibrosis (CF) patients is characterized by biofilms, tolerant to antibiotics and host responses. Instead, immune responses contribute to the tissue damage. However, this may depend on localization of infection in the upper conductive or in the peripheral respiratory zone. To study this we produced two distinct sizes of small alginate beads (SB) and large beads (LB) containing P. aeruginosa. In total, 175 BALB/c mice were infected with either SB or LB. At day 1 the quantitative bacteriology was higher in the SB group compared to the LB group (P < 0·003). For all time-points smaller biofilms were identified by Alcian blue staining in the SB group (P < 0·003). Similarly, the area of the airways in which biofilms were identified were smaller (P < 0·0001). A shift from exclusively endobronchial to both parenchymal and endobronchial localization of inflammation from day 1 to days 2/3 (P < 0·05), as well as a faster resolution of inflammation at days 5/6, was observed in the SB group (P < 0·03). Finally, both the polymorphonuclear neutrophil leucocyte (PMN) mobilizer granulocyte colony-stimulating factor (G-CSF) and chemoattractant macrophage inflammatory protein-2 (MIP-2) were increased at day 1 in the SB group (P < 0·0001). In conclusion, we have established a model enabling studies of host responses in different pulmonary zones. An effective recognition of and a more pronounced host response to infection in the peripheral zones, indicating that increased lung damage was demonstrated. Therefore, treatment of the chronic P. aeruginosa lung infection should be directed primarily at the peripheral lung zone by combined intravenous and inhalation antibiotic treatment.
Collapse
Affiliation(s)
- L J Christophersen
- Department of Clinical Microbiology 93.01, Copenhagen University Hospital, Rigshospitalet Department of Forensic Medicine, University of Copenhagen, Copenhagen, Denmark
| | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Johansen L, Koch J, Frees D, Aalbæk B, Nielsen O, Leifsson P, Iburg T, Svalastoga E, Buelund L, Bjarnsholt T, Høiby N, Jensen H. Pathology and Biofilm Formation in a Porcine Model of Staphylococcal Osteomyelitis. J Comp Pathol 2012; 147:343-53. [DOI: 10.1016/j.jcpa.2012.01.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 12/19/2011] [Accepted: 01/21/2012] [Indexed: 11/28/2022]
|
28
|
Adams NG, Adekambi T, Afeltra J, Aguado J, Aires de Sousa M, Akiyoshi K, Al Hasan M, Ala-Kokko T, Albert M, Alfandari S, Allen D, Allerberger F, Almyroudis N, Alp E, Amin R, Anderson-Berry A, Andes DR, Andremont A, Andreu A, Angelakis M, Antachopoulos C, Antoniadou A, Arabatzis M, Arlet G, Arnez M, Arnold C, Asensio A, Asseray N, Ausiello C, Avni T, Ayling R, Baddour L, Baguelin M, Bányai K, Barbour A, Basco LK, Bauer D, Bayston R, Beall B, Becker K, Behr M, Bejon P, Belliot G, Benito-Fernandez J, Benjamin D, Benschop K, Berencsi G, Bergeron MG, Bernard K, Berner R, Beyersmann J, Bille J, Bizzini A, Bjarnsholt T, Blanc D, Blanco J, Blot S, Bohnert J, Boillat N, Bonomo R, Bonten M, Bordon JM, Borel N, Boschiroli ML, Bosilkovski M, Bosso JA, Botelho-Nevers E, Bou G, Bretagne S, Brouqui P, Brun-Buisson C, Brunetto M, Bucher H, Buchheidt D, Buckling A, Bulpa P, Cambau E, Canducci F, Cantón R, Capobianchi M, Carattoli A, Carcopino X, Cardona-Castro N, Carling PC, Carrat F, Castilla J, Castilletti C, Cavaco L, Cavallo R, Ceccherini-Silberstein F, Centrón D, Chappuis F, Charrel R, Chen M, Chevaliez S, Chezzi C, Chomel B, Chowers M, Chryssanthou E, Ciammaruconi A, Ciccozzi M, Cid J, Ciofu O, Cisneros D, Ciufolini MG, Clark C, Clarke SC, Clayton R, Clementi M, Clemons K, Cloeckaert A, Cloud J, Coenye T, Cohen Bacri S, Cohen R, Coia J, Colombo A, Colson P, Concerse P, Cordonnier C, Cormican M, Cornaglia G, Cornely O, Costa S, Cots F, Craxi A, Creti R, Crnich C, Cuenca Estrella M, Cusi MG, d'Ettorre G, da Cruz Lamas C, Daikos G, Dannaoui E, De Barbeyrac B, De Grazia S, de Jager C, de Lamballerie X, de Marco F, del Palacio A, Delpeyroux F, Denamur E, Denis O, Depaquit J, Deplano A, Desenclos JC, Desjeux P, Deutch S, Di Luca D, Dianzani F, Diep B, Diestra K, Dignani C, Dimopoulos G, Divizia M, Doi Y, Dornbusch HJ, Dotis J, Drancourt M, Drevinek P, Dromer F, Dryden M, Dubreuil L, Dubus JC, Dumitrescu O, Dumke R, DuPont H, Edelstein M, Eggimann P, Eis-Huebinger AM, El Atrouni WI, Entenza J, Ergonul O, Espinel-Ingroff A, Esteban J, Etienne J, Fan XG, Fenollar F, Ferrante P, Ferrieri P, Ferry T, Feuchtinger T, Finegold S, Fingerle V, Fitch M, Fitzgerald R, Flori P, Fluit A, Fontana R, Fournier PE, François M, Francois P, Freedman DO, Friedrich A, Gallego L, Gallinella G, Gangneux JP, Gannon V, Garbarg-Chenon A, Garbino J, Garnacho-Montero J, Gatermann S, Gautret P, Gentile G, Gerlich W, Ghannoum M, Ghebremedhin B, Ghigo E, Giamarellos-Bourboulis E, Girgis R, Giske C, Glupczynski Y, Gnarpe J, Gomez-Barrena E, Gorwitz RJ, Gosselin R, Goubau P, Gould E, Gradel K, Gray J, Gregson D, Greub G, Grijalva CG, Groll A, Groschup M, Gutiérrez J, Hackam DG, Hall WA, Hallett R, Hansen S, Harbarth S, Harf-Monteil C, Hasanjani RMR, Hasler P, Hatchette T, Hauser P, He Q, Hedges A, Helbig J, Hennequin C, Herrmann B, Hezode C, Higgins P, Hoesli I, Hoiby N, Hope W, Houvinen P, Hsu LY, Huard R, Humphreys H, Icardi M, Imoehl M, Ivanova K, Iwamoto T, Izopet J, Jackson Y, Jacobsen K, Jang TN, Jasir A, Jaulhac B, Jaureguy F, Jefferies JM, Jehl F, Johnstone J, Joly-Guillou ML, Jonas M, Jones M, Joukhadar C, Kahl B, Kaier K, Kaiser L, Kato H, Katragkou A, Kearns A, Kern W, Kerr K, Kessin R, Kibbler C, Kimberlin D, Kittang B, Klaassen C, Kluytmans J, Ko WC, Koh WJ, Kostrzewa M, Kourbeti I, Krause R, Krcmery V, Krizova P, Kuijper E, Kullberg BJ, Kumar G, Kunin CM, La Scola B, Lagging M, Lagrou K, Lamagni T, Landini P, Landman D, Larsen A, Lass-Floerl C, Laupland K, Lavigne JP, Leblebicioglu H, Lee B, Lee CH, Leggat P, Lehours P, Leibovici L, Leon L, Leonard N, Leone M, Lescure X, Lesprit P, Levy PY, Lew D, Lexau CA, Li SY, Li W, Lieberman D, Lina B, Lina G, Lindsay JA, Livermore D, Lorente L, Lortholary O, Lucet JC, Lund B, Lütticken R, MacLeod C, Madhi S, Maertens J, Maggi F, Maiden M, Maillard JY, Maira-Litran T, Maltezou H, Manian FA, Mantadakis E, Maragakis L, Marcelin AG, Marchaim D, Marchetti O, Marcos M, Markotic A, Martina B, Martínez J, Martinez JL, Marty F, Maurin M, McGee L, Mediannikov O, Meersseman W, Megraud F, Meletiadis J, Mellmann A, Meyer E, Meyer W, Meylan P, Michalopoulos A, Micol R, Midulla F, Mikami Y, Miller RF, Miragaia M, Miriagou V, Mitchell TJ, Miyakis S, Mokrousov I, Monecke S, Mönkemüller K, Monno L, Monod M, Morales G, Moriarty F, Morosini I, Mortensen E, Mubarak K, Mueller B, Mühlemann K, Muñoz Bellido JL, Murray P, Muscillo M, Mylotte J, Naessens A, Nagy E, Nahm MH, Nassif X, Navarro D, Navarro F, Neofytos D, Nes I, Ní Eidhin D, Nicolle L, Niederman MS, Nigro G, Nimmo G, Nordmann P, Nougairède A, Novais A, Nygard K, Oliveira D, Orth D, Ortiz JR, Osherov N, Österblad M, Ostrosky-Zeichner L, Pagano L, Palamara AT, Pallares R, Panagopoulou P, Pandey P, Panepinto J, Pappas G, Parkins M, Parola P, Pasqualotto A, Pasteran F, Paul M, Pawlotsky JM, Peeters M, Peixe L, Pepin J, Peralta G, Pereyre S, Perfect JR, Petinaki E, Petric M, Pettigrew M, Pfaller M, Philipp M, Phillips G, Pichichero M, Pierangeli A, Pierard D, Pigrau C, Pilishvili T, Pinto F, Pistello M, Pitout J, Poirel L, Poli G, Poppert S, Posfay-Barbe K, Pothier P, Poxton I, Poyart C, Pozzetto B, Pujol M, Pulcini C, Punyadeera C, Ramirez M, Ranque S, Raoult D, Rasigade JP, Re MC, Reilly JS, Reinert R, Renaud B, Rice L, Rich S, Richet H, Rigouts L, Riva E, Rizzo C, Robotham J, Rodicio MR, Rodriguez J, Rodriguez-Bano J, Rogier C, Roilides E, Rolain JM, Rooijakkers S, Rooney P, Rossi F, Rotimi V, Rottman M, Roux V, Ruhe J, Russo G, Sadowy E, Sagel U, Said SI, Saijo M, Sak B, Sa-Leao R, Sanders EAM, Sanguinetti M, Sarrazin C, Savelkoul P, Scheifele D, Schmidt WP, Schønheyder H, Schönrich G, Schrenzel J, Schubert S, Schwarz K, Schwarz S, Sefton A, Segondy M, Seifert H, Seng P, Senneville E, Sexton D, Shafer RW, Shalit I, Shankar N, Shata TM, Shields J, Sibley C, Sicinschi L, Siljander T, Simitsopoulou M, Simoons-Smit AM, Sissoko D, Sjögren J, Skiada A, Skoczynska A, Skov R, Slack M, Sogaard M, Sola C, Soriano A, Sotto A, Sougakoff W, Sougakoff W, Souli M, Spelberg B, Spelman D, Spiliopoulou I, Springer B, Stefani S, Stein A, Steinbach WJ, Steinbakk M, Strakova L, Strenger V, Sturm P, Sullivan P, Sutton D, Symmons D, Tacconelli E, Tamalet C, Tang JW, Tang YW, Tattevin P, Thibault V, Thomsen RW, Thuny F, Tong S, Torres C, Townsend R, Tristan A, Trouillet JL, Tsai HC, Tsitsopoulos P, Tuerlinckx D, Tulkens P, Tumbarello M, Tureen J, Turnidge JD, Turriziani O, Tutuian R, Uçkay I, Upton M, Vabret A, Vamvakas EC, van den Boom D, Van Eldere J, van Leeuwen W, van Strijp J, Van Veen S, Vandamme P, Vandenesch F, Vayssier M, Velin D, Venditti M, Venter M, Venuti A, Vergnaud G, Verheij T, Verhofstede C, Viscoli C, Vizza CD, Vogel U, Waller A, Wang YF, Warn P, Warris A, Wauters G, Weidmann M, Weill FX, Weinberger M, Welch D, Wellinghausen N, Wheat J, Widmer A, Wild F, Willems R, Willinger B, Winstanley C, Witte W, Wolff M, Wong F, Wootton M, Wyllie D, Xu W, Yamamoto S, Yaron S, Yildirim I, Zaoutis T, Zazzi M, Zbinden R, Zehender GG, Zemlickova H, Zerbini ML, Zhang L, Zhang Y, Zhao YD, Zhu Z, Zimmerli W. ACKNOWLEDGEMENT OF REVIEWERS. Clin Microbiol Infect 2011. [DOI: 10.1111/j.1469-0691.2010.03428.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
29
|
Ulrich M, Beer I, Braitmaier P, Dierkes M, Kummer F, Krismer B, Schumacher U, Grapler-Mainka U, Riethmuller J, Jensen PO, Bjarnsholt T, Hoiby N, Bellon G, Doring G. Relative contribution of Prevotella intermedia and Pseudomonas aeruginosa to lung pathology in airways of patients with cystic fibrosis. Thorax 2010; 65:978-84. [DOI: 10.1136/thx.2010.137745] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
30
|
Hansen C, Pressler T, Nielsen K, Jensen P, Bjarnsholt T, Høiby N. Inflammation in Achromobacter xylosoxidans infected cystic fibrosis patients. J Cyst Fibros 2010; 9:51-8. [DOI: 10.1016/j.jcf.2009.10.005] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2009] [Revised: 10/26/2009] [Accepted: 10/27/2009] [Indexed: 11/26/2022]
|
31
|
Andersen AS, Joergensen B, Bjarnsholt T, Johansen H, Karlsmark T, Givskov M, Krogfelt KA. Quorum-sensing-regulated virulence factors in Pseudomonas aeruginosa are toxic to Lucilia sericata maggots. Microbiology (Reading) 2009; 156:400-407. [PMID: 19892758 PMCID: PMC2885677 DOI: 10.1099/mic.0.032730-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Maggot debridement therapy (MDT) is widely used for debridement of chronic infected wounds; however, for wounds harbouring specific bacteria limited effect or failure of the treatment has been described. Here we studied the survival of Lucilia sericata maggots encountering Pseudomonas aeruginosa PAO1 in a simple assay with emphasis on the quorum-sensing (QS)-regulated virulence. The maggots were challenged with GFP-tagged P. aeruginosa wild-type (WT) PAO1 and a GFP-tagged P. aeruginosa ΔlasRrhlR (ΔRR) QS-deficient mutant in different concentrations. Maggots were killed in the presence of WT PAO1 whereas the challenge with the QS mutant showed a survival reduction of ∼25 % compared to negative controls. Furthermore, bacterial intake by the maggots was lower in the presence of WT PAO1 compared to the PAO1 ΔRR mutant. Maggot excretions/secretions (ES) were assayed for the presence of QS inhibitors; only high doses of ES showed inhibition of QS in P. aeruginosa. Thus P. aeruginosa was shown to be toxic to L. sericata maggots. This, coupled to the preferential feeding by the maggots and reduced ingestion of P. aeruginosa, could explain MDT failure in wounds colonized by P. aeruginosa. Wounds heavily colonized with P. aeruginosa should be a counterindication for MDT unless used in combination with a pre-treatment with other topical therapeutics targeting P. aeruginosa.
Collapse
Affiliation(s)
- A S Andersen
- University of Copenhagen Faculty of Health Sciences, Blegdamsvej 3B, 2200 Copenhagen N, Denmark.,Copenhagen Wound Healing Center, Bispebjerg Hospital, Bispebjerg bakke 23, Copenhagen NV, Denmark.,Statens Serum Institut ABMP, Artillerivej 5, Copenhagen S, Denmark
| | - B Joergensen
- Copenhagen Wound Healing Center, Bispebjerg Hospital, Bispebjerg bakke 23, Copenhagen NV, Denmark
| | - T Bjarnsholt
- University of Copenhagen Faculty of Health Sciences, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - H Johansen
- University of Copenhagen Faculty of Health Sciences, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - T Karlsmark
- Copenhagen Wound Healing Center, Bispebjerg Hospital, Bispebjerg bakke 23, Copenhagen NV, Denmark
| | - M Givskov
- University of Copenhagen Faculty of Health Sciences, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - K A Krogfelt
- Statens Serum Institut ABMP, Artillerivej 5, Copenhagen S, Denmark
| |
Collapse
|
32
|
Kolpen M, Hansen CR, Bjarnsholt T, Moser C, Christensen LD, van Gennip M, Ciofu O, Mandsberg L, Kharazmi A, Doring G, Givskov M, Hoiby N, Jensen PO. Polymorphonuclear leucocytes consume oxygen in sputum from chronic Pseudomonas aeruginosa pneumonia in cystic fibrosis. Thorax 2009; 65:57-62. [DOI: 10.1136/thx.2009.114512] [Citation(s) in RCA: 142] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
33
|
van Gennip M, Moser C, Christensen LD, Bjarnsholt T, Calum H, Jensen PO, Christophersen L, Hougen HP, Ciofu O, Molin S, Givskov M, Hoiby N. Augmented effect of early antibiotic treatment in mice with experimental lung infections due to sequentially adapted mucoid strains of Pseudomonas aeruginosa. J Antimicrob Chemother 2009; 64:1241-50. [DOI: 10.1093/jac/dkp352] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
34
|
Hansen C, Pressler T, Nielsen K, Bjarnsholt T, Høiby N. Chronic infection with Achromobacter xylosoxidans leads to rapid decrease towards end-stage lung disease in cystic fibrosis patients. J Cyst Fibros 2009. [DOI: 10.1016/s1569-1993(09)60254-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
35
|
Calum H, Moser C, Jensen PØ, Christophersen L, Maling DS, van Gennip M, Bjarnsholt T, Hougen HP, Givskov M, Jacobsen GK, Høiby N. Thermal injury induces impaired function in polymorphonuclear neutrophil granulocytes and reduced control of burn wound infection. Clin Exp Immunol 2008; 156:102-10. [PMID: 19210518 DOI: 10.1111/j.1365-2249.2008.03861.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Severe thermal injury induces immunosuppression, involving all parts of the immune system, especially when large fractions of the total body surface area are affected. An animal model was established to characterize the burn-induced immunosuppression. In our novel mouse model a 6% third-degree burn injury was induced in mice with a hot-air blower. The third-degree burn was confirmed histologically. The mice were allocated into five groups: control, shave, burn, infection and burn infection group. At 48 h, a decline in the concentration of peripheral blood leucocytes was observed in the group of mice with burn wound. The reduction was ascribed to the decline in concentration of polymorphonuclear neutrophil leucocytes and monocytes. When infecting the skin with Pseudomonas aeruginosa, a dissemination of bacteria was observed only in the burn wound group. Histological characterization of the skin showed a more polymorphonuclear neutrophil granulocytes (PMNs)-dominated inflammation in the group of mice with infected burn wound compared with the with burn wound group. In contrast, a higher degree of inflammation was observed in the burn wound group compared with the group of mice with infected burn wound. Furthermore, the oxidative burst and the phagocytic capacity of the PMNs were reduced in the group of mice with burn wound. Using this novel mouse model of thermal injury a decline of peripheral leucocytes was observed, whereas the increased local inflammatory response at the site of infection showed reduced capacity to contain and eliminate the infection.
Collapse
Affiliation(s)
- H Calum
- Department of Clinical Microbiology, Rigshospitalet, Denmark.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Alhede M, Bjarnsholt T, Jensen P, Parsek M, Høiby N, Rasmussen T, Givskov M. A transcriptome analysis of the in vitro response of Pseudomonas aeruginosa to polymorphonuclear leukocyte exposure. J Cyst Fibros 2008. [DOI: 10.1016/s1569-1993(08)60197-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
37
|
Kolpen M, Bjarnsholt T, Moser C, Christensen L, Gennip M, Hansen C, Ciofu O, Mandsberg L, Kharazmi A, Döring G, Givskov M, Høiby N, Jensen P. The respiratory burst of PMNs accelerates anaerobiosis in sputum from CF patients with chronic Pseudomonas aeruginosa lung infection. J Cyst Fibros 2008. [DOI: 10.1016/s1569-1993(08)60208-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
38
|
Bjarnsholt T, Jensen P, Madsen K, Andersen C, Pressler T, Givskov M, Høiby N. 76* The bacterial burden of the CF lung – Uncovering the black box. J Cyst Fibros 2007. [DOI: 10.1016/s1569-1993(07)60066-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
39
|
Moser C, van Gennip M, Bjarnsholt T, Calum H, Jensen P, Lee B, Ciofu O, Givskov M, Molin S, Høiby N. O197 Virulence and biofilm formation of non-mucoid and mucoid Pseudomonas aeruginosa strains in cystic fibrosis: an animal study. Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)70130-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
40
|
Bjarnsholt T, Jensen P, Rasmussen T, Christophersen L, Calum H, Hougen H, Rygaard J, Moser C, Høiby N, Givskov M. 79 Fighting Pseudomonas aeruginosa by exploiting its communication — quorum sensing. J Cyst Fibros 2006. [DOI: 10.1016/s1569-1993(06)80070-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|