1
|
Gross S, Herren S, Gysin M, Rominski A, Roditscheff A, Risch M, Imkamp F, Crich D, Hobbie SN. In vitro susceptibility of Neisseria gonorrhoeae to netilmicin and etimicin in comparison to gentamicin and other aminoglycosides. Eur J Clin Microbiol Infect Dis 2024:10.1007/s10096-024-04782-2. [PMID: 38388739 DOI: 10.1007/s10096-024-04782-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 02/09/2024] [Indexed: 02/24/2024]
Abstract
PURPOSE Single doses of gentamicin have demonstrated clinical efficacy in the treatment of urogenital gonorrhea, but lower cure rates for oropharyngeal and anorectal gonorrhea. Formulations selectively enriched in specific gentamicin C congeners have been proposed as a less toxic alternative to gentamicin, potentially permitting higher dosing to result in increased plasma exposures at the extragenital sites of infection. The purpose of the present study was to compare the antibacterial activity of individual gentamicin C congeners against Neisseria gonorrhoeae to that of other aminoglycoside antibiotics. METHODS Antimicrobial susceptibility of three N. gonorrhoeae reference strains and 152 clinical isolates was assessed using standard disk diffusion, agar dilution, and epsilometer tests. RESULTS Gentamicin C1, C2, C1a, and C2a demonstrated similar activity against N. gonorrhoeae. Interestingly, susceptibility to the 1-N-ethylated aminoglycosides etimicin and netilmicin was significantly higher than the susceptibility to their parent compounds gentamicin C1a and sisomicin, and to any other of the 25 aminoglycosides assessed in this study. Propylamycin, a 4'-propylated paromomycin analogue, was significantly more active against N. gonorrhoeae than its parent compound, too. CONCLUSION Selectively enriched gentamicin formulations hold promise for a less toxic but equally efficacious alternative to gentamicin. Our study warrants additional consideration of the clinically established netilmicin and etimicin for treatment of genital and perhaps extragenital gonorrhea. Additional studies are required to elucidate the mechanism behind the advantage of alkylated aminoglycosides.
Collapse
Affiliation(s)
- Sonja Gross
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Sebastian Herren
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Marina Gysin
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Anna Rominski
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Anna Roditscheff
- Private University in the Principality of Liechtenstein, Dorfstrasse 24, 9495, Triesen, Liechtenstein
- Dr. Risch Medical Laboratory, Waldeggstrasse 37, 3097, Liebefeld, Switzerland
| | - Martin Risch
- Private University in the Principality of Liechtenstein, Dorfstrasse 24, 9495, Triesen, Liechtenstein
- Dr. Risch Medical Laboratory, Waldeggstrasse 37, 3097, Liebefeld, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - David Crich
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, GA, 30602, USA
| | - Sven N Hobbie
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland.
- Division of Clinical Bacteriology and Mycology, University Hospital Basel, Petersgraben 4, 4031, Basel, Switzerland.
| |
Collapse
|
2
|
Pietrzko E, Bögli S, Frick K, Ebner-Dietler S, Capone C, Imkamp F, Koliwer-Brandl H, Müller N, Keller E, Brandi G. Correction: Broad Range Eubacterial Polymerase Chain Reaction of Cerebrospinal Fluid Reduces the Time to Exclusion of and Costs Associated with Ventriculostomy-Related Infection in Hemorrhagic Stroke. Neurocrit Care 2024:10.1007/s12028-023-01926-8. [PMID: 38316737 DOI: 10.1007/s12028-023-01926-8] [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] [Indexed: 02/07/2024]
Affiliation(s)
- Elisabeth Pietrzko
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland.
| | - Stefan Bögli
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
- Department of Neurology, Clinical Neuroscience Center Zürich, University Hospital Zürich, Frauenklinikstrasse 26, 8091, Zürich, Switzerland
| | - Katja Frick
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| | - Sabeth Ebner-Dietler
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| | - Crescenzo Capone
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zürich, Gloriastrasse 28/30, 8006, Zürich, Switzerland
| | - Hendrik Koliwer-Brandl
- Institute of Medical Microbiology, University of Zürich, Gloriastrasse 28/30, 8006, Zürich, Switzerland
| | - Nicolas Müller
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| | - Emanuela Keller
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
- Department of Neurosurgery, University Hospital Zürich, Frauenklinikstrasse 10, 8091, Zürich, Switzerland
| | - Giovanna Brandi
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| |
Collapse
|
3
|
Jünger C, Imkamp F, Balakrishna S, Gysin M, Haldimann K, Brugger SD, Scheier TC, Hampel B, Hobbie SN, Günthard HF, Braun DL. Phenotypic and genotypic characterization of Neisseria gonorrhoeae isolates among individuals at high risk for sexually transmitted diseases in Zurich, Switzerland. Int J STD AIDS 2024:9564624241230266. [PMID: 38297880 DOI: 10.1177/09564624241230266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
BACKGROUND While ceftriaxone resistance remains scarce in Switzerland, global Neisseria gonorrhoeae (NG) antimicrobial resistance poses an urgent threat. This study describes clinical characteristics in MSM (men who have sex with men) diagnosed with NG infection and analyses NG resistance by phenotypic and genotypic means. METHODS Data of MSM enrolled in three clinical cohorts with a positive polymerase chain reaction test (PCR) for NG were analysed between January 2019 and December 2021 and linked with antibiotic susceptibility testing. Bacterial isolates were subjected to whole genome sequencing (WGS). RESULTS Of 142 participants, 141 (99%) were MSM and 118 (84%) living with HIV. Participants were treated with ceftriaxone (N = 79), azithromycin (N = 2), or a combination of both (N = 61). No clinical or microbiological failures were observed. From 182 positive PCR samples taken, 23 were available for detailed analysis. Based on minimal inhibitory concentrations (MICs), all isolates were susceptible to ceftriaxone, gentamicin, cefixime, cefpodoxime, ertapenem, zoliflodacin, and spectinomycin. Resistance to azithromycin, tetracyclines and ciprofloxacin was observed in 10 (43%), 23 (100%) and 11 (48%) of the cases, respectively. Analysis of WGS data revealed combinations of resistance determinants that matched with the corresponding phenotypic resistance pattern of each isolate. CONCLUSION Among the MSM diagnosed with NG mainly acquired in Switzerland, ceftriaxone MICs were low for a subset of bacterial isolates studied and no treatment failures were observed. For azithromycin, high occurrences of in vitro resistance were found. Gentamicin, cefixime, cefpodoxime, ertapenem, spectinomycin, and zoliflodacin displayed excellent in vitro activity against the 23 isolates underscoring their potential as alternative agents to ceftriaxone.
Collapse
Affiliation(s)
- Christian Jünger
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Suraj Balakrishna
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Marina Gysin
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Klara Haldimann
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Silvio D Brugger
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Thomas C Scheier
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | | | - Sven N Hobbie
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Huldrych F Günthard
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Dominique L Braun
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| |
Collapse
|
4
|
Reinhold I, Quiblier C, Blaser F, Bögeholz J, Imkamp F, Schuurmans MM, Soyka MB, Zbinden R, Mueller NJ. Detection of Scedosporium spp.: Colonizer or pathogen? A retrospective analysis of clinical significance and management in a large tertiary center. Med Mycol 2024; 62:myae002. [PMID: 38242842 PMCID: PMC10837104 DOI: 10.1093/mmy/myae002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 11/16/2023] [Revised: 01/03/2024] [Accepted: 01/15/2024] [Indexed: 01/21/2024] Open
Abstract
Infections with Scedosporium spp. are emerging in the past two decades and are associated with a high mortality rate. Microbiological detection can be associated with either colonization or infection. Evolution from colonization into infection is difficult to predict and clinical management upon microbiological detection is complex. Microbiological samples from 2015 to 2021 were retrospectively analyzed in a single tertiary care center. Classification into colonization or infection was performed upon first microbiological detection. Clinical evolution was observed until July 2023. Further diagnostic procedures after initial detection were analyzed. Among 38 patients with microbiological detection of Scedosporium spp., 10 were diagnosed with an infection at the initial detection and two progressed from colonization to infection during the observation time. The main sites of infection were lung (5/12; 41.6%) followed by ocular sites (4/12; 33.3%). Imaging, bronchoscopy or biopsies upon detection were performed in a minority of patients. Overall mortality rate was similar in both groups initially classified as colonization or infection [30.7% and 33.3%, respectively (P = 1.0)]. In all patients where surgical debridement of site of infection was performed (5/12; 42%); no death was observed. Although death occurred more often in the group without eradication (3/4; 75%) compared with the group with successful eradication (1/8; 12.5%), statistical significance could not be reached (P = 0.053). As therapeutic management directly impacts patients' outcome, a multidisciplinary approach upon microbiological detection of Scedosporium spp. should be encouraged. Data from larger cohorts are warranted in order to analyze contributing factors favoring the evolution from colonization into infection.
Collapse
Affiliation(s)
- Ilana Reinhold
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Chantal Quiblier
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Frank Blaser
- Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland
| | - Jan Bögeholz
- Department of Medical Oncology and Hematology, University Hospital Zurich, Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Macé M Schuurmans
- Division of Pulmonology, University Hospital Zurich, Zurich, Switzerland
| | - Michael B Soyka
- Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zurich, Zurich, Switzerland
| | - Reinhard Zbinden
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Nicolas J Mueller
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| |
Collapse
|
5
|
Pietrzko E, Bögli S, Frick K, Ebner-Dietler S, Capone C, Imkamp F, Koliwer-Brandl H, Müller N, Keller E, Brandi G. Broad Range Eubacterial Polymerase Chain Reaction of Cerebrospinal Fluid Reduces the Time to Exclusion of and Costs Associated with Ventriculostomy-Related Infection in Hemorrhagic Stroke. Neurocrit Care 2023:10.1007/s12028-023-01888-x. [PMID: 38087175 DOI: 10.1007/s12028-023-01888-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 06/08/2023] [Accepted: 10/31/2023] [Indexed: 01/04/2024]
Abstract
BACKGROUND Patients with hemorrhagic stroke and an external ventricular drain in situ are at risk for ventriculostomy-related-infections (VRI). Because of the contamination of the cerebrospinal fluid (CSF) with blood and the high frequency of false negative CSF culture, the diagnosis of VRI remains challenging. This study investigated the introduction of CSF broad range eubacterial polymerase chain reaction (ePCR) and its effect on frequency and duration of antibiotic therapy for VRI, neurocritical care unit (NCCU) length of stay, related costs, and outcome. METHODS Between 2020 and 2022, we prospectively included 193 patients admitted to the NCCU of the University Hospital of Zürich with hemorrhagic stroke and an external ventricular drain for more than 48 h. Patient characteristics, serum inflammatory markers, white blood cell count in CSF, use and duration of antibiotic treatment for VRI, microbiological findings (CSF cultures and ePCR tests), and NCCU length of stay were compared in patients with no infection, noncerebral infection, suspected VRI, and confirmed VRI. Data of patients with suspected VRI of this cohort were compared with a retrospective cohort of patients with suspected VRI treated at our NCCU before the introduction of CSF ePCR testing (2013-2019). RESULTS Out of 193 patients, 12 (6%) were diagnosed with a confirmed VRI, 66 (34%) with suspected VRI, 90 (47%) with a noncerebral infection, and 25 (13%) had no infection at all. Compared with the retrospective cohort of patients, the use of CSF ePCR resulted in a reduction of patients treated for suspected VRI for the whole duration of 14 days (from 51 to 11%). Furthermore, compared with the retrospective group of patients with suspected VRI (n = 67), after the introduction of CSF ePCR, patients with suspected VRI had shorter antibiotic treatment duration of almost 10 days and, hence, lower related costs with comparable outcome at 3 months. CONCLUSIONS The use of CSF ePCR to identify VRI resulted in shorter antibiotic treatment duration without changing the outcome, as compared with a retrospective cohort of patients with suspected VRI.
Collapse
Affiliation(s)
- Elisabeth Pietrzko
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland.
| | - Stefan Bögli
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
- Department of Neurology, Clinical Neuroscience Center Zürich, University Hospital Zürich, Frauenklinikstrasse 26, 8091, Zürich, Switzerland
| | - Katja Frick
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| | - Sabeth Ebner-Dietler
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| | - Crescenzo Capone
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zürich, Gloriastrasse 28/30, 8006, Zürich, Switzerland
| | - Hendrik Koliwer-Brandl
- Institute of Medical Microbiology, University of Zürich, Gloriastrasse 28/30, 8006, Zürich, Switzerland
| | - Nicolas Müller
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| | - Emanuela Keller
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
- Department of Neurosurgery, University Hospital Zürich, Frauenklinikstrasse 10, 8091, Zürich, Switzerland
| | - Giovanna Brandi
- Neurocritical Care Unit, Institute of Intensive Care, University Hospital of Zürich, Rämistrasse 100, 8091, Zürich, Switzerland
| |
Collapse
|
6
|
Mancini S, Seth-Smith HMB, Kolesnik-Goldmann N, Hinic V, Roloff T, Imkamp F, Egli A. Evaluation of the RESIST ACINETO multiplex immunochromatographic assay for detection of OXA-23-like, OXA-40/58-like and NDM carbapenemase production in Acinetobacter baumannii. J Antimicrob Chemother 2023; 78:2771-2774. [PMID: 37563802 PMCID: PMC10631821 DOI: 10.1093/jac/dkad253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023] Open
Affiliation(s)
- Stefano Mancini
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Helena M B Seth-Smith
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | | | - Vladimira Hinic
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Tim Roloff
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Adrian Egli
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| |
Collapse
|
7
|
Kolesnik-Goldmann N, Seth-Smith HMB, Haldimann K, Imkamp F, Roloff T, Zbinden R, Hobbie SN, Egli A, Mancini S. Comparison of Disk Diffusion, E-Test, and Broth Microdilution Methods for Testing In Vitro Activity of Cefiderocol in Acinetobacter baumannii. Antibiotics (Basel) 2023; 12:1212. [PMID: 37508308 PMCID: PMC10376138 DOI: 10.3390/antibiotics12071212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/14/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
The reference method for cefiderocol antimicrobial susceptibility testing is broth microdilution (BMD) with iron-depleted-Mueller-Hinton (ID-MH) medium, whereas breakpoints recommended for disk diffusion (DD) are based on MH-agar plates. We aimed to compare the performance of the commercial BMD tests ComASP (Liofilchem) and UMIC (Bruker), and DD and E-test using MH- and ID-MH-agar plates with the reference BMD method using 100 carbapenem-resistant-A. baumannii isolates. Standard BMD was performed according to the EUCAST guidelines; DD and E-test were carried out using two commercial MH-agar plates (BioMérieux and Liofilchem) and an in-house ID-MH-agar plate, while ComASP and UMIC were performed according to the manufacturer's guidelines. DD performed with the ID-MH-agar plates led to a higher categorical agreement (CA, 95.1%) with standard BMD and fewer categorization errors compared to the commercial MH-agar plates (CA BioMérieux 91.1%, Liofilchem 89.2%). E-test on ID-MH-agar plates exhibited a significantly higher essential agreement (EA, 75%) with standard BMD compared to the two MH-agar plates (EA BioMérieux 57%, Liofilchem 44%), and showed a higher performance in detecting high-level resistance than ComASP and UMIC (mean log2 difference with standard BMD for resistant isolates of 0.5, 2.83, and 2.08, respectively). In conclusion, DD and E-test on ID-MH-agar plates exhibit a higher diagnostic performance than on MH-agar plates and the commercial BMD methods. Therefore, we recommend using ID-MH-agar plates for cefiderocol susceptibility testing of A. baumannii.
Collapse
Affiliation(s)
| | - Helena M B Seth-Smith
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Klara Haldimann
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Tim Roloff
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Reinhard Zbinden
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Sven N Hobbie
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Adrian Egli
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| | - Stefano Mancini
- Institute of Medical Microbiology, University Zurich, Gloriastrasse 28/30, 8006 Zurich, Switzerland
| |
Collapse
|
8
|
Imkamp F, Bodendoerfer E, Mancini S. QUIRMIA-A Phenotype-Based Algorithm for the Inference of Quinolone Resistance Mechanisms in Escherichia coli. Antibiotics (Basel) 2023; 12:1119. [PMID: 37508215 PMCID: PMC10376670 DOI: 10.3390/antibiotics12071119] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/26/2023] [Accepted: 06/27/2023] [Indexed: 07/30/2023] Open
Abstract
OBJECTIVES Quinolone resistance in Escherichia coli occurs mainly as a result of mutations in the quinolone-resistance-determining regions of gyrA and parC, which encode the drugs' primary targets. Mutational alterations affecting drug permeability or efflux as well as plasmid-based resistance mechanisms can also contribute to resistance, albeit to a lesser extent. Simplifying and generalizing complex evolutionary trajectories, low-level resistance towards fluoroquinolones arises from a single mutation in gyrA, while clinical high-level resistance is associated with two mutations in gyrA plus one mutation in parC. Both low- and high-level resistance can be detected phenotypically using nalidixic acid and fluoroquinolones such as ciprofloxacin, respectively. The aim of this study was to develop a decision tree based on disc diffusion data and to define epidemiological cut-offs to infer resistance mechanisms and to predict clinical resistance in E. coli. This diagnostic algorithm should provide a coherent genotype/phenotype classification, which separates the wildtype from any non-wildtype and further differentiates within the non-wildtype. METHODS Phenotypic susceptibility of 553 clinical E. coli isolates towards nalidixic acid, ciprofloxacin, norfloxacin and levofloxacin was determined by disc diffusion, and the genomes were sequenced. Based on epidemiological cut-offs, we developed a QUInolone Resistance Mechanisms Inference Algorithm (QUIRMIA) to infer the underlying resistance mechanisms responsible for the corresponding phenotypes, resulting in the categorization as "susceptible" (wildtype), "low-level resistance" (non-wildtype) and "high-level resistance" (non-wildtype). The congruence of phenotypes and whole genome sequencing (WGS)-derived genotypes was then assigned using QUIRMIA- and EUCAST-based AST interpretation. RESULTS QUIRMIA-based inference of resistance mechanisms and sequencing data were highly congruent (542/553, 98%). In contrast, EUCAST-based classification with its binary classification into "susceptible" and "resistant" isolates failed to recognize and properly categorize low-level resistant isolates. CONCLUSIONS QUIRMIA provides a coherent genotype/phenotype categorization and may be integrated in the EUCAST expert rule set, thereby enabling reliable detection of low-level resistant isolates, which may help to better predict outcome and to prevent the emergence of clinical resistance.
Collapse
Affiliation(s)
- Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, 8006 Zurich, Switzerland
| | - Elias Bodendoerfer
- Institute of Medical Microbiology, University of Zurich, 8006 Zurich, Switzerland
| | - Stefano Mancini
- Institute of Medical Microbiology, University of Zurich, 8006 Zurich, Switzerland
| |
Collapse
|
9
|
Albini S, Marti H, Imkamp F, Borel N. [Update on the zoonotic potential of Chlamydia]. SCHWEIZ ARCH TIERH 2023; 165:165-0. [PMID: 36852870 DOI: 10.17236/sat00387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
INTRODUCTION Knowledge of the obligate intracellular bacteria from the Chlamydiaceae family has increased significantly in recent years. Not only new chlamydia species, such as Chlamydia avium or C. buteonis in birds have been described, but also known chlamydia in new host species, such as C. psittaci in horses. This review article provides an up-to-date overview of the zoonotic potential of C. psittaci, C. abortus, C. caviae and C. felis and summarizes current findings on other chlamydia species in different animal species; supplemented by information on optimal sampling and pathogen detection.
Collapse
Affiliation(s)
- S Albini
- Nationales Referenzzentrum für Geflügel- und Kaninchenkrankheiten, Institut für Lebensmittelsicherheit und -hygiene, Vetsuisse Fakultät, Universität Zürich
| | - H Marti
- Nationales und internationales Referenzlabor für ovine Chlamydiose, Institut für Veterinärpathologie, Vetsuisse Fakultät, Universität Zürich
| | - F Imkamp
- Institut für Medizinische Mikrobiologie, Universität Zürich
| | - N Borel
- Nationales und internationales Referenzlabor für ovine Chlamydiose, Institut für Veterinärpathologie, Vetsuisse Fakultät, Universität Zürich
| |
Collapse
|
10
|
Schreiber PW, Zihlmann R, Schärer V, Hasse B, Imkamp F, Schulthess B, Sander P, Zingg W. Longitudinal increase in the detection rate of Mycobacterium chimaera in heater-cooler device-derived water samples. J Hosp Infect 2023; 131:190-193. [PMID: 36410531 DOI: 10.1016/j.jhin.2022.11.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 09/09/2022] [Revised: 10/26/2022] [Accepted: 11/04/2022] [Indexed: 11/19/2022]
Abstract
BACKGROUND Colonization with Mycobacterium chimaera and other non-tuberculous mycobacteria (NTM) has been reported for heater-cooler devices (HCDs) produced by several manufacturers. Up until now, exclusively LivaNova (London, UK) HCDs have been associated with M. chimaera infections after cardiac surgery. The vast majority of studies on HCD colonization were cross-sectional. AIM We were interested in longitudinal dynamics of mycobacterial growth in HCD water samples and analysed data of a prospective mycobacterial surveillance of five LivaNova 3T HCDs. METHODS Five LivaNova HCDs were subjected to prospective mycobacterial surveillance. For each HCD and the total of HCDs, results of mycobacterial detection were analyzed. Logistic regression was applied to model the association between growth of any NTM or M. chimaera and duration of HCD use. RESULTS Non-tuberculous mycobacteria were isolated in 319 (48.0%, 21 water samples grew more than one mycobacterial species) of a total of 665 water samples. The most frequently detected species were M. chimaera (N = 247/319, 77.4%), Mycobacterium gordonae (46/319, 14.4%) and Mycobacterium paragordonae (34/319, 10.7%). Detection rates increased prospectively for any NTM (odds ratio (OR) per year in use: 1.60, 95% confidence interval (CI) 1.17-2.24, P<0.001) and for M. chimaera (OR per year in use: 1.67, 95% CI 1.11-2.57, P<0.01). CONCLUSION Longer duration of HCD use was associated with higher detection rates for any NTM and M. chimaera, respectively.
Collapse
Affiliation(s)
- P W Schreiber
- University Hospital Zurich, Division of Infectious Diseases and Hospital Epidemiology and University Zurich, Zurich, Switzerland.
| | - R Zihlmann
- ETH Zurich, Department of Mathematics, Zurich, Switzerland
| | - V Schärer
- University Hospital Zurich, Division of Infectious Diseases and Hospital Epidemiology and University Zurich, Zurich, Switzerland
| | - B Hasse
- University Hospital Zurich, Division of Infectious Diseases and Hospital Epidemiology and University Zurich, Zurich, Switzerland
| | - F Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland; National Reference Centre for Mycobacteria, Zurich, Switzerland
| | - B Schulthess
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland; National Reference Centre for Mycobacteria, Zurich, Switzerland
| | - P Sander
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland; National Reference Centre for Mycobacteria, Zurich, Switzerland
| | - W Zingg
- University Hospital Zurich, Division of Infectious Diseases and Hospital Epidemiology and University Zurich, Zurich, Switzerland
| |
Collapse
|
11
|
Imkamp F, Kolesnik-Goldmann N, Bodendoerfer E, Zbinden R, Mancini S. Detection of Extended-Spectrum β-Lactamases (ESBLs) and AmpC in Class A and Class B Carbapenemase-Producing Enterobacterales. Microbiol Spectr 2022; 10:e0213722. [PMID: 36287018 PMCID: PMC9769508 DOI: 10.1128/spectrum.02137-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 09/30/2022] [Indexed: 01/06/2023] Open
Abstract
In carbapenemase-producing Enterobacterales (CPE) additional β-lactam resistance mechanisms such as extended-spectrum-β-lactamases (ESBL) and/or AmpC-β-lactamases are generally difficult to detect by phenotypical methods. Recently, a modified version of the CLSI ESBL confirmatory combination disc diffusion (CDD) test, which involves the addition of boronic acid and EDTA on discs containing ESBL and AmpC substrates ± inhibitors, has been proposed for the detection of ESBL in class A and class B CPE. Here, the performance of the modified CDD test was evaluated using 121 genotypically characterized class A and class B CPE. Also, the effectiveness of the NG-Test CTX-M-MULTI lateral flow immunoassay was evaluated for ESBL detection. For class A CPE (n = 47), the modified CDD method exhibited an equal specificity (95.7%) and a higher sensitivity (100%) compared to the standard method (91.7%). The CTX-M-MULTI test detected ESBL in all CTX-M-type ESBL producers (n = 23), whereas it was negative for all CTX-M-type ESBL-negative isolates (n = 24). For class B CPE (n = 71), the modified method significantly improved both sensitivity (95%) and specificity (100%) in detecting ESBL compared to the standard method (17.5% sensitivity and 83.9% specificity). In comparison, the CTX-M-MULTI led to identification of ESBL in all CTX-M-ESBL-producers (n = 39) and no false-positive signal was generated with the CTX-M-type-ESBL-negative isolates (n = 30). Furthermore, the modified CDD improved the robustness of the method for AmpC detection (inconclusive results were produced in 53/57 and 10/57 cases with the standard and modified method, respectively), although the sensitivity of the test was poor (23.5%). Here, we propose a practical and cost-effective approach combining the modified CDD and the CTX-M-MULTI test for detection of ESBL and/or AmpC in class A and B CPE. IMPORTANCE Antimicrobial resistance is a growing public health threat of broad concern worldwide. Timely detection of antibiotic resistance mechanisms can help to monitor and to curb the spread of resistant bacteria within the hospital setting as well as in the environment. In this work we report an accurate and affordable method to phenotypically identify difficult-to-detect resistance determinants in highly resistant (carbapenemase-producing) bacteria. This method may be implemented in any diagnostic microbiology lab and may reduce the underreporting of relevant resistance mechanisms.
Collapse
Affiliation(s)
- Frank Imkamp
- Institute of Medical Microbiology, University Zurich, Zurich, Switzerland
| | | | - Elias Bodendoerfer
- Institute of Medical Microbiology, University Zurich, Zurich, Switzerland
| | - Reinhard Zbinden
- Institute of Medical Microbiology, University Zurich, Zurich, Switzerland
| | - Stefano Mancini
- Institute of Medical Microbiology, University Zurich, Zurich, Switzerland
| |
Collapse
|
12
|
Dähler R, Brugger SD, Frank M, Greutmann M, Sromicki J, Marques-Maggio E, Imkamp F, Bauernschmitt R, Carrel T, Zinkernagel AS, Hasse B. A retrospective analysis of blood culture-negative endocarditis at a tertiary care centre in Switzerland. Swiss Med Wkly 2022; 152:40012. [PMID: 36534966 DOI: 10.57187/smw.2022.40016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
AIMS OF THE STUDY Numerous studies from different countries have contributed to an improved understanding of blood culture-negative infective endocarditis. However, little is known about its epidemiology and microbiology in Switzerland. We aimed to assess the epidemiology and microbiology of blood culture-negative endocarditis at the University Hospital Zurich, Switzerland. METHODS We screened all patients hospitalised between 1997 and 2020 with possible or definite endocarditis at our institution. Thereof, we identified all cases with blood culture-negative endocarditis and retrospectively retrieved patient characteristics, microbiological, histopathological, radiographic and surgical data from medical records. RESULTS Among 861 patients screened, 66 (7.7%) cases of blood culture-negative endocarditis were identified. Thereof, 31 cases could be microbiologically documented or not documented (n = 30), and in five cases a non-infectious aetiology was confirmed. Endocarditis predominantly affected men (77%) and the left heart (79%); predisposing factors were prosthetic valves (42%), congenital heart disease (35%) and prior endocarditis (14%). The most common reasons for negative blood cultures were antibiotic treatment prior to blood culture sampling (35%), fastidious and slow growing microorganisms (30%) and definite non-infective endocarditis (8%). Coxiella burnetii and Bartonella spp. were the most common fastidious bacteria identified. In addition to serology, identification of causative microorganisms was possible by microbiological and/or histopathological analysis of tissue samples, of which polymerase chain reaction testing (PCR) of the 16S ribosomal RNA proved to be most successful. CONCLUSIONS The present study provides a detailed analysis of blood culture-negative endocarditis over a time span of more than 20 years in Zurich, Switzerland. Antibiotic treatment prior to blood collection, and fastidious and slow growing organisms were identified as main reasons for sterile blood cultures. Typical culture-negative bacteria were mainly found by PCR and/or culture of tissue samples.
Collapse
Affiliation(s)
- Roman Dähler
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
| | - Silvio D Brugger
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
| | - Michelle Frank
- Department of Cardiology, University Heart Center, University Hospital Zurich, University of Zurich, Switzerland
| | - Matthias Greutmann
- Department of Cardiology, University Heart Center, University Hospital Zurich, University of Zurich, Switzerland
| | - Juri Sromicki
- Clinic for Cardiac Surgery, University Hospital Zurich, University of Zurich, Switzerland
| | - Ewerton Marques-Maggio
- Department of Surgical Pathology, University Hospital Zurich, University of Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Switzerland
| | - Robert Bauernschmitt
- Clinic for Cardiac Surgery, University Hospital Zurich, University of Zurich, Switzerland
| | - Thierry Carrel
- Clinic for Cardiac Surgery, University Hospital Zurich, University of Zurich, Switzerland
| | - Annelies S Zinkernagel
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
| | - Barbara Hasse
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
| |
Collapse
|
13
|
Ring A, Balakrishna S, Imkamp F, Burkard S, Triet F, Brunschweiler F, Grube C, Bodmer R, Kouyos RD, Günthard HF, Braun DL. High rates of asymptomatic Mycoplasma genitalium infections with high proportion of genotypic resistance to first-line macrolide treatment among men enrolled in the Zurich primary HIV infection study. Open Forum Infect Dis 2022; 9:ofac217. [PMID: 35783686 PMCID: PMC9246285 DOI: 10.1093/ofid/ofac217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 04/25/2022] [Indexed: 11/15/2022] Open
Abstract
Background Mycoplasma genitalium (Mg) is an emerging sexually transmitted pathogen among men who have sex with men (MSM). Resistance to recommended antimicrobial agents are of public health concern. Few data exist on Mg infections in MSM diagnosed with human immunodeficiency virus (HIV) during primary HIV infection. Methods Participants of the Zurich Primary HIV Study (ClinicalTrials.gov Identifier NCT 00537966) were systematically offered screening for sexually transmitted infections (STIs) between April 2019 and September 2020. Screening was performed using an in-house polymerase chain reaction panel comprising Mg including genotypic resistance testing for macrolides and quinolones, Chlamydia trachomatis including serovars L1-L3, Neisseria gonorrhoeae, Treponema pallidum, and Hemophilus ducreyi. Results We screened 148 of 266 (55.6%) participants, with an overall total of 415 follow-up visits. Ninety-one percent were MSM. The incidence rate for all STIs was 47.0 (95% confidence interval [CI], 32.2–68.6) per 100 person-years. Mycoplasma genitalium was the most frequently detected pathogen: 30 participants (20%) presented with at least 1 Mg infection, corresponding to a period prevalence of 20.3% and incidence rate of 19.5 Mg infections (95% CI, 11.8–32.4). Most Mg infections (93%) were asymptomatic, and 9 (30%) participants showed spontaneous clearance. We detected high rates of antibiotic resistance: 73.3% to macrolides, 3.3% to quinolones, and 13.3% resistance to both antibiotics. Conclusions The high prevalence of mostly asymptomatic Mg infections and high rate of spontaneous clearance support cautious initiation for treatment. The high proportion of macrolide-resistant strains suggests that a genotypic determination of resistance should be standard of care. Moxifloxacin should be the preferred treatment option for symptomatic Mg infections among MSM if resistance testing is unavailable.
Collapse
Affiliation(s)
- Alexander Ring
- Division of Infectious Disease and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
| | - Suraj Balakrishna
- Division of Infectious Disease and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Sara Burkard
- Division of Infectious Disease and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
| | - Flurina Triet
- Division of Infectious Disease and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
| | - Flurina Brunschweiler
- Division of Infectious Disease and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
| | - Christina Grube
- Division of Infectious Disease and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
| | - Rebecca Bodmer
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Roger D. Kouyos
- Division of Infectious Disease and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Huldrych F. Günthard
- Division of Infectious Disease and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Dominique L. Braun
- Division of Infectious Disease and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Switzerland
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| |
Collapse
|
14
|
Walser F, Prinz J, Rahm S, Zingg PO, Mancini S, Imkamp F, Zbinden R, Achermann Y. Antimicrobial susceptibility testing is crucial when treating Finegoldia magna infections. Eur J Clin Microbiol Infect Dis 2022:10.1007/s10096-022-04439-y. [PMID: 35391578 DOI: 10.1007/s10096-022-04439-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 10/01/2021] [Accepted: 03/24/2022] [Indexed: 11/03/2022]
Abstract
Finegoldia magna is an anaerobic gram-positive bacterium that can cause invasive human infections. Recently, a 52-year-old patient suffering from a periprosthetic joint infection (PJI) due to F. magna was treated with cefepime on hemodialysis; however, treatment failed due to relapse caused by antibiotic-resistant strains. Reports on the antimicrobial susceptibility of F. magna clinical isolates are rare. We collected 57 clinical F. magna isolates from Zurich, Switzerland, between September 2019 and July 2020 and tested their antimicrobial susceptibility to investigate the local resistance pattern. Antimicrobial susceptibility testing (AST) was evaluated for nine antibiotics (benzylpenicillin, amoxicillin/clavulanic acid, cefuroxime, cefepime, levofloxacin, rifampicin, metronidazole, doxycycline, and clindamycin) by E-test according to CLSI guidelines. All F. magna strains were susceptible to benzylpenicillin, amoxicillin/clavulanic acid, and metronidazole, while 75% to clindamycin. F. magna isolates showed MIC values lower than species-unrelated breakpoints for cefuroxime, levofloxacin, and cefepime in 93%, 56%, and 32% of the cases, respectively. MIC values for rifampicin and doxycycline were lower than locally determined ECOFFs in 98% and 72% of the cases, respectively. In summary, we recommend the use of benzylpenicillin, amoxicillin/clavulanic acid, or metronidazole without prior AST as first-line treatment option against F. magna PJI infections. If cefuroxime, cefepime, levofloxacin, rifampicin, doxycycline, or clindamycin are used, AST is mandatory.
Collapse
Affiliation(s)
- Fabienne Walser
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Raemistrasse 100, CH-8091, Zurich, Switzerland
| | - Julia Prinz
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Raemistrasse 100, CH-8091, Zurich, Switzerland
- Department of Dermatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Stefan Rahm
- Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Patrick O Zingg
- Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Stefano Mancini
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Reinhard Zbinden
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Yvonne Achermann
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Raemistrasse 100, CH-8091, Zurich, Switzerland.
- Dermatology, University Hospital Zurich, University of Zurich And Department of Internfal Medicine, Hospital Zollikerberg, Zollikerberg, Switzerland.
| |
Collapse
|
15
|
Zeuschner P, Siemer S, Stöckle M, Schiefelbein F, Schneller A, Schön G, Wiesinger C, Pfuner J, Ubrig B, Gloger S, Osmonov D, Eraky A, Witt J, Liakos N, Wagner C, Hadaschik B, Radtke J, Al Nader M, Imkamp F, Kuczyk M, Huusmann S, Harke N. Impact of surgical experience prior to robot-assisted partial nephrectomy on surgical outcomes: Large multicenter analysis with 2,500 patients. Eur Urol 2022. [DOI: 10.1016/s0302-2838(22)00213-5] [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: 11/29/2022]
|
16
|
Dervas E, Hatt J, Kummrow M, Grimm F, Imkamp F, Peterhans S, Gascho D, Rushing E. Necrotizing Encephalitis Caused by Balamuthia mandrillaris in a Western Lowland Gorilla (Gorilla gorilla gorilla). J Comp Pathol 2022. [DOI: 10.1016/j.jcpa.2021.11.131] [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: 10/18/2022]
|
17
|
Imkamp F, Albini S, Karbach M, Kimmich N, Spinelli C, Herren S, Sprecher R, Meier K, Borel N. Zoonotic Chlamydiae as rare causes of severe pneumonia. Swiss Med Wkly 2022; 152:w30102. [PMID: 35019255 DOI: 10.4414/smw.2022.w30102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Zoonotic species of the Chlamydiaceae family should be considered as rare pathogenic agents of severe atypical pneumonia. A fatal case of a severe pneumonia due to Chlamydia psittaci was traced back to pet birds, and pneumonia in a pregnant woman was attributed to abortions in a sheep and goat flock, being the source of Chlamydia abortus. The two SARS‑CoV‑2-negative pneumonia cases presented here were investigated in an inter-disciplinary approach involving physicians and veterinarians. State-of-art molecular methods allowed the identification and genotyping of zoonotic Chlamydiae.
Collapse
Affiliation(s)
- Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Switzerland
| | - Sarah Albini
- National Reference Centre for Poultry and Rabbit Diseases, Institute of Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, Switzerland
| | - Michael Karbach
- Institute of Intensive Care Medicine, University Hospital Zurich, Switzerland
| | - Nina Kimmich
- Department of Obstetrics, University Hospital Zurich, Switzerland
| | | | - Sebastian Herren
- Institute of Medical Microbiology, University of Zurich, Switzerland
| | | | - Karin Meier
- Cantonal Veterinary Office, Zurich, Switzerland
| | - Nicole Borel
- Institute of Veterinary Pathology, Vetsuisse Faculty, University Zurich, Switzerland
| |
Collapse
|
18
|
Gysin M, Acevedo CT, Haldimann K, Bodendoerfer E, Imkamp F, Bulut K, Buehler PK, Brugger SD, Becker K, Hobbie SN. Antimicrobial susceptibility patterns of respiratory Gram-negative bacterial isolates from COVID-19 patients in Switzerland. Ann Clin Microbiol Antimicrob 2021; 20:64. [PMID: 34493302 PMCID: PMC8422836 DOI: 10.1186/s12941-021-00468-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Accepted: 08/27/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Bacterial superinfections associated with COVID-19 are common in ventilated ICU patients and impact morbidity and lethality. However, the contribution of antimicrobial resistance to the manifestation of bacterial infections in these patients has yet to be elucidated. METHODS We collected 70 Gram-negative bacterial strains, isolated from the lower respiratory tract of ventilated COVID-19 patients in Zurich, Switzerland between March and May 2020. Species identification was performed using MALDI-TOF; antibiotic susceptibility profiles were determined by EUCAST disk diffusion and CLSI broth microdilution assays. Selected Pseudomonas aeruginosa isolates were analyzed by whole-genome sequencing. RESULTS Pseudomonas aeruginosa (46%) and Enterobacterales (36%) comprised the two largest etiologic groups. Drug resistance in P. aeruginosa isolates was high for piperacillin/tazobactam (65.6%), cefepime (56.3%), ceftazidime (46.9%) and meropenem (50.0%). Enterobacterales isolates showed slightly lower levels of resistance to piperacillin/tazobactam (32%), ceftriaxone (32%), and ceftazidime (36%). All P. aeruginosa isolates and 96% of Enterobacterales isolates were susceptible to aminoglycosides, with apramycin found to provide best-in-class coverage. Genotypic analysis of consecutive P. aeruginosa isolates in one patient revealed a frameshift mutation in the transcriptional regulator nalC that coincided with a phenotypic shift in susceptibility to β-lactams and quinolones. CONCLUSIONS Considerable levels of antimicrobial resistance may have contributed to the manifestation of bacterial superinfections in ventilated COVID-19 patients, and may in some cases mandate consecutive adaptation of antibiotic therapy. High susceptibility to amikacin and apramycin suggests that aminoglycosides may remain an effective second-line treatment of ventilator-associated bacterial pneumonia, provided efficacious drug exposure in lungs can be achieved.
Collapse
Affiliation(s)
- Marina Gysin
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Claudio Tirso Acevedo
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
| | - Klara Haldimann
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Elias Bodendoerfer
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Karl Bulut
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Philipp Karl Buehler
- Institute for Intensive Care Medicine, University Hospital Zurich and University of Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
| | - Silvio Daniel Brugger
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
| | - Katja Becker
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland
| | - Sven N Hobbie
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 30, 8006, Zurich, Switzerland.
| |
Collapse
|
19
|
Acevedo CT, Imkamp F, Marques Maggio E, Brugger SD. Primary cutaneous nocardiosis of the head and neck in an immunocompetent patient. BMJ Case Rep 2021; 14:14/5/e241217. [PMID: 34035021 DOI: 10.1136/bcr-2020-241217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Nocardiosis is known to be an opportunistic infection most commonly affecting immunocompromised patients that can lead to life-threatening conditions. Primary cutaneous disease remains a rare manifestation and unlike pulmonary or disseminated nocardiosis, it usually affects immunocompetent individuals. We present a case of a primary cutaneous nocardiosis of the head and neck after an insect bite in a healthy 50-year-old woman who had recently travelled from Greece. She presented with a painful right-sided swelling of her face and neck and an ulcerated plaque over the right temple. Biopsy of the plaque revealed inflammation with abscess formation indicating underlying infection. Culture from the biopsy showed growth of Nocardia spp and 16S rRNA gene sequence analysis identified Nocardia brasiliensis The patient was treated with trimethoprim/sulfamethoxazole and subsequently switched to amoxicillin/clavulanic acid due to a drug eruption. Antibiotic therapy was continued for a total of 3 months with complete resolution of the skin lesions.
Collapse
Affiliation(s)
- Claudio Tirso Acevedo
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Frank Imkamp
- Department of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Ewerton Marques Maggio
- Institute of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Silvio Daniel Brugger
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| |
Collapse
|
20
|
Yusibova M, Hasman H, Clausen PTLC, Imkamp F, Wagner K, Andersen LP. CRHP Finder, a webtool for the detection of clarithromycin resistance in Helicobacter pylori from whole-genome sequencing data. Helicobacter 2020; 25:e12752. [PMID: 32844531 DOI: 10.1111/hel.12752] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/08/2020] [Accepted: 07/22/2020] [Indexed: 01/23/2023]
Abstract
BACKGROUND Resistance to clarithromycin in Helicobacter pylori (H pylori) is mediated by mutations in the domain V of the 23S rRNA gene (A2142G, A2143G, A2142C). Other polymorphisms in the 23S rRNA gene have been reported to cause low-level clarithromycin resistance but their importance is still under debate. In this study, we aimed to develop and evaluate the CRHP Finder webtool for detection of the most common mutations mediating clarithromycin resistance from whole-genome sequencing (WGS) data. Moreover, we included an analysis of 23 H pylori strains from Danish patients between January 2017 and September 2019 in Copenhagen, Denmark. MATERIALS AND METHODS The CRHP Finder detects the fraction of each of the four nucleotides in nucleotide positions 2142, 2143, 2182, 2244 and 2712 of the 23S rRNA gene in H pylori (E coli numbering) by aligning raw sequencing reads (fastq format) with k-mer alignment (KMA). The nucleotide distribution in each position is compared to previously described point mutations mediating clarithromycin resistance in H pylori, and a genotypic prediction of the clarithromycin resistance phenotype is presented as output. For validation of the CRHP webtool, 137 fastq paired-end sequencing datasets originating from a well-characterized strain collection of H pylori were analyzed. RESULTS The CRHP Finder correctly identified all resistance mutations reported in the sequencing data of 137 H pylori strains. In the 23 Danish H pylori strains, CRHP Finder detected A2143G (13%) in all resistant strains, and T2182C (13%) and C2244T (4,3%) nucleotide exchanges in only susceptible strains. CONCLUSION In this study, we present the validation of the first webtool for H pylori resistance prediction based on the detection of 23S rRNA mutations (A2142C, A2142G, A2143G, T2182C, C2244T, T2712C) from WGS data of H pylori.
Collapse
Affiliation(s)
- Melodi Yusibova
- Department of Clinical Microbiology, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark
| | - Henrik Hasman
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | | | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Karoline Wagner
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland.,Clinical Virology Division, University Hospital Basel, Basel, Switzerland
| | - Leif Percival Andersen
- Department of Clinical Microbiology, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark
| |
Collapse
|
21
|
Dylus D, Pillonel T, Opota O, Wüthrich D, Seth-Smith HMB, Egli A, Leo S, Lazarevic V, Schrenzel J, Laurent S, Bertelli C, Blanc DS, Neuenschwander S, Ramette A, Falquet L, Imkamp F, Keller PM, Kahles A, Oberhaensli S, Barbié V, Dessimoz C, Greub G, Lebrand A. NGS-Based S. aureus Typing and Outbreak Analysis in Clinical Microbiology Laboratories: Lessons Learned From a Swiss-Wide Proficiency Test. Front Microbiol 2020; 11:591093. [PMID: 33424794 PMCID: PMC7793906 DOI: 10.3389/fmicb.2020.591093] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 08/03/2020] [Accepted: 10/19/2020] [Indexed: 12/31/2022] Open
Abstract
Whole genome sequencing (WGS) enables high resolution typing of bacteria up to the single nucleotide polymorphism (SNP) level. WGS is used in clinical microbiology laboratories for infection control, molecular surveillance and outbreak analyses. Given the large palette of WGS reagents and bioinformatics tools, the Swiss clinical bacteriology community decided to conduct a ring trial (RT) to foster harmonization of NGS-based bacterial typing. The RT aimed at assessing methicillin-susceptible Staphylococcus aureus strain relatedness from WGS and epidemiological data. The RT was designed to disentangle the variability arising from differences in sample preparation, SNP calling and phylogenetic methods. Nine laboratories participated. The resulting phylogenetic tree and cluster identification were highly reproducible across the laboratories. Cluster interpretation was, however, more laboratory dependent, suggesting that an increased sharing of expertise across laboratories would contribute to further harmonization of practices. More detailed bioinformatic analyses unveiled that while similar clusters were found across laboratories, these were actually based on different sets of SNPs, differentially retained after sample preparation and SNP calling procedures. Despite this, the observed number of SNP differences between pairs of strains, an important criterion to determine strain relatedness given epidemiological information, was similar across pipelines for closely related strains when restricting SNP calls to a common core genome defined by S. aureus cgMLST schema. The lessons learned from this pilot study will serve the implementation of larger-scale RT, as a mean to have regular external quality assessments for laboratories performing WGS analyses in a clinical setting.
Collapse
Affiliation(s)
- David Dylus
- Department of Computational Biology, University of Lausanne, Lausanne, Switzerland.,Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland.,SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Trestan Pillonel
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Onya Opota
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Daniel Wüthrich
- Division of Clinical Bacteriology and Mycology, University Hospital of Basel, Basel, Switzerland.,Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Helena M B Seth-Smith
- Division of Clinical Bacteriology and Mycology, University Hospital of Basel, Basel, Switzerland.,Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Adrian Egli
- Division of Clinical Bacteriology and Mycology, University Hospital of Basel, Basel, Switzerland.,Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Stefano Leo
- Bacteriology Laboratory, Division of Laboratory Medicine, Department of Genetics Laboratory Medicine and Pathology, Geneva University Hospitals, Geneva, Switzerland
| | - Vladimir Lazarevic
- Bacteriology Laboratory, Division of Laboratory Medicine, Department of Genetics Laboratory Medicine and Pathology, Geneva University Hospitals, Geneva, Switzerland
| | - Jacques Schrenzel
- Bacteriology Laboratory, Division of Laboratory Medicine, Department of Genetics Laboratory Medicine and Pathology, Geneva University Hospitals, Geneva, Switzerland
| | - Sacha Laurent
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Claire Bertelli
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Dominique S Blanc
- Service of Hospital Preventive Medicine, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | | | - Alban Ramette
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Laurent Falquet
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland.,Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Peter M Keller
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Andre Kahles
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland.,Biomedical Informatics, Swiss Federal Institute of Technology (ETH Zürich), ETH Zürich, Zurich, Switzerland
| | - Simone Oberhaensli
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland.,Interfaculty Bioinformatics Unit, University of Bern, Bern, Switzerland
| | - Valérie Barbié
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Christophe Dessimoz
- Department of Computational Biology, University of Lausanne, Lausanne, Switzerland.,Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland.,SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland.,Department of Genetics, Evolution and Environment, University College London, London, United Kingdom.,Department of Computer Science, University College London, London, United Kingdom
| | - Gilbert Greub
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Aitana Lebrand
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland
| |
Collapse
|
22
|
Klapdor R, Kruppa M, Kleine M, Imkamp F, Schmidt J, Hertel H, Hillemanns P. Das SOCIUS-Mentoring Programm – Next-Level Förderung des gynäkologisch-onkologischen Nachwuchses. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1717168] [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] [Indexed: 10/23/2022] Open
Affiliation(s)
- R Klapdor
- Medizinische Hochschule Hannover, Klinik für Frauenheilkunde und Geburtshilfe
| | - M Kruppa
- Medizinische Hochschule Hannover, Klinik für Frauenheilkunde und Geburtshilfe
| | - M Kleine
- Medizinische Hochschule Hannover, Klinik für Allgemein-, Viszeral- und Transplantationschirurgie
| | - F Imkamp
- Medizinische Hochschule Hannover, Klinik für Urologie und Urologische Onkologie
| | - J Schmidt
- Medizinische Hochschule Hannover, Klinik für Frauenheilkunde und Geburtshilfe
| | - H Hertel
- Medizinische Hochschule Hannover, Klinik für Frauenheilkunde und Geburtshilfe
| | - P Hillemanns
- Medizinische Hochschule Hannover, Klinik für Frauenheilkunde und Geburtshilfe
| |
Collapse
|
23
|
Meissner V, Hollerer M, Kron M, Schiele S, Albers P, Arsov C, Kuczyk M, Imkamp F, Hohenfellner M, Schütz V, Gschwend J, Herkommer K. Effect of sexual behavior on prostate-specific antigen levels in middle-aged men screened for prostate cancer: Results from the PROBASE trial. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)32651-3] [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: 11/27/2022] Open
|
24
|
Bodendoerfer E, Marchesi M, Imkamp F, Courvalin P, Böttger EC, Mancini S. Co-occurrence of aminoglycoside and β-lactam resistance mechanisms in aminoglycoside- non-susceptible Escherichia coli isolated in the Zurich area, Switzerland. Int J Antimicrob Agents 2020; 56:106019. [DOI: 10.1016/j.ijantimicag.2020.106019] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 04/28/2020] [Accepted: 05/01/2020] [Indexed: 02/06/2023]
|
25
|
Kaelin MB, Kuster SP, Hasse B, Schulthess B, Imkamp F, Halbe M, Sander P, Sax H, Schreiber PW. Diversity of nontuberculous mycobacteria in Heater-Cooler Devices - results from prospective surveillance. J Hosp Infect 2020; 105:S0195-6701(20)30105-5. [PMID: 32151675 DOI: 10.1016/j.jhin.2020.03.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 03/02/2020] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The international outbreak of cardiac surgery-associated Mycobacterium chimaera infections was traced back to infectious aerosols originating from contaminated water reservoirs of heater-cooler devices (HCD). In general, nontuberculous mycobacteria (NTM) frequently colonize water systems and can contaminate medical devices. Data on detection of NTM other than M. chimaera in samples gathered from HCDs are scarce. The present study summarizes prospective mycobacterial surveillance of five HCDs over more than four years. METHODS A cohort of five, in 2014 factory-new acquired, LivaNova 3T (London, UK) HCDs were prospectively followed. Until mid-April 2014 HCDs were maintained according to the manufacturer's recommendations, subsequently according to an intensified in-house protocol including exhaust air evacuation. Mycobacterial surveillance cultures consisted of monthly water samples gathered from patient and cardioplegia circuits, as well as airflow samples. RESULTS Out of 441 water samples, 170 (38.6%) revealed NTM growth. The most frequently detected NTM were Mycobacterium chimaera (n=120 (67.4%)), Mycobacterium gordonae (n=35 (19.7 %)), and Mycobacterium paragordonae (n=17 (9.6%)). Growth of NTM, M. chimaera and M. paragordonae was significantly more common in water samples derived from the patient than the cardioplegia circuit of the HCD. Three (2.0%) out of 150 air samples grew NTM. CONCLUSION Growth of NTM in HCD water samples was frequent. Diverse NTM species were detected, with M. chimaera being most common. The majority of air samples remained negative. The relevance of NTM other than M. chimaera contaminating HCDs is poorly defined, but a recent report on a HCD-associated outbreak with Mycobacterium abscessus confirms a potential threat.
Collapse
Affiliation(s)
- M B Kaelin
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich and University of Zurich, Zurich, Switzerland
| | - S P Kuster
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich and University of Zurich, Zurich, Switzerland
| | - B Hasse
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich and University of Zurich, Zurich, Switzerland
| | - B Schulthess
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland; National Reference Centre for Mycobacteria, Zurich, Switzerland
| | - F Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - M Halbe
- Department of Cardiovascular Surgery, University Hospital Zurich, Zurich, Switzerland
| | - P Sander
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland; National Reference Centre for Mycobacteria, Zurich, Switzerland
| | - H Sax
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich and University of Zurich, Zurich, Switzerland
| | - P W Schreiber
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich and University of Zurich, Zurich, Switzerland.
| |
Collapse
|
26
|
Rexer H, Bedke J, Imkamp F. Adjuvante Studie beim Nierenzellkarzinom mit hohem Rezidiv-Risiko nach Nephrektomie:. Aktuelle Urol 2020; 51:20-21. [PMID: 32018329 DOI: 10.1055/a-0963-4541] [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] [Indexed: 10/25/2022]
Affiliation(s)
- H Rexer
- AUO Geschäftsstelle, Seestr. 11, 17252 Schwarz,
| | - J Bedke
- Organgruppe Nierenkarzinom der Arbeitsgemeinschaft Urologische Onkologie in der Deutschen Krebsgesellschaft e. V., Kuno-Fischer-Str. 8, 14057 Berlin
| | - F Imkamp
- Leiter der klinischen Prüfung, Medizinische Hochschule Hannover, Klinik für Urologie, Carl-Neuberg-Str. 1, 30625 Hannover
| |
Collapse
|
27
|
Preiswerk B, Imkamp F, Vorburger D, Hömke RV, Keller PM, Wagner K. Mycoplasma penetrans bacteremia in an immunocompromised patient detected by metagenomic sequencing: a case report. BMC Infect Dis 2020; 20:7. [PMID: 31900105 PMCID: PMC6942334 DOI: 10.1186/s12879-019-4723-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 04/25/2019] [Accepted: 12/22/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Mycoplasma sp. are well recognized as etiological agents of respiratory and sexually transmitted disease. Mycoplasma penetrans, a species of Mycoplasma sp., has been frequently detected in HIV-positive patients and associated with the progression of HIV-associated disease. To date, there is only a single case report describing M. penetrans as the causative agent of a severe respiratory tract infection in a HIV-negative patient. CASE PRESENTATION In this report, we describe the case of M. penetrans bacteremia in a HIV-negative, 38-year-old, female, immunocompromised, solid organ transplant patient (combined kidney and pancreas transplantation in 2016), who was admitted to our hospital with anemic uterine bleeding and fever of 38.3 °C. Several hours before her admission at our university hospital, a latex bladder catheter was inserted into her uterus and she complained about fatigue, dizziness and ongoing vaginal bleeding. Laboratory examination showed severe anemia, but microbiological examination was inconspicuous (culture negative vaginal and cervical smears, negative urine culture). Bacterial blood cultures showed a growth signal after 4 h, but microscopic examination with Gram staining and subcultures on different agar media did not identify bacterial pathogens. To identify the bacterial cause of malignancy in the patient, metagenomic sequencing of the blood culture was performed that identified M. penetrans. CONCLUSION Metagenomic sequencing identified M. penetrans in an immunosuppressed patient with culture-negative bacteremia. Clinicians should be aware of the opportunistic potential of M. penetrans that may cause severe infections in certain vulnerable patient populations and the limitations of culture and Gram staining for confirming the presence of fastidious bacterial pathogens like Mycoplasma spp.
Collapse
Affiliation(s)
- Benjamin Preiswerk
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland.,Present Address: Triemli Hospital Zurich, Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Denise Vorburger
- Department of Gynecology, University Hospital Zurich, Zurich, Switzerland
| | - Rico V Hömke
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Peter M Keller
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland.,Present Address: Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Karoline Wagner
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland. .,Laboratory Medicine, University Hospital of Basel, Petersgraben 4, 4031, Basel, Switzerland.
| |
Collapse
|
28
|
Müller AU, Imkamp F, Weber-Ban E. The Mycobacterial LexA/RecA-Independent DNA Damage Response Is Controlled by PafBC and the Pup-Proteasome System. Cell Rep 2019; 23:3551-3564. [PMID: 29924998 DOI: 10.1016/j.celrep.2018.05.073] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [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: 03/09/2018] [Revised: 04/16/2018] [Accepted: 05/22/2018] [Indexed: 12/11/2022] Open
Abstract
Mycobacteria exhibit two DNA damage response pathways: the LexA/RecA-dependent SOS response and a LexA/RecA-independent pathway. Using a combination of transcriptomics and genome-wide binding site analysis, we demonstrate that PafBC (proteasome accessory factor B and C), encoded in the Pup-proteasome system (PPS) gene locus, is the transcriptional regulator of the predominant LexA/RecA-independent pathway. Comparison of the resulting PafBC regulon with the DNA damage response of Mycobacterium smegmatis reveals that the majority of induced DNA repair genes are upregulated by PafBC. We further demonstrate that RecA, a member of the PafBC regulon and principal regulator of the SOS response, is degraded by the PPS when DNA damage stress has been overcome. Our results suggest a model for the regulation of the mycobacterial DNA damage response that employs the concerted action of PafBC as master transcriptional activator and the PPS for removal of DNA repair proteins to maintain a temporally controlled stress response.
Collapse
Affiliation(s)
- Andreas U Müller
- ETH Zurich, Institute of Molecular Biology and Biophysics, 8093 Zurich, Switzerland
| | - Frank Imkamp
- University of Zurich, Institute of Medical Microbiology, 8006 Zurich, Switzerland
| | - Eilika Weber-Ban
- ETH Zurich, Institute of Molecular Biology and Biophysics, 8093 Zurich, Switzerland.
| |
Collapse
|
29
|
Mancini S, Marchesi M, Imkamp F, Wagner K, Keller PM, Quiblier C, Bodendoerfer E, Courvalin P, Böttger EC. Population-based inference of aminoglycoside resistance mechanisms in Escherichia coli. EBioMedicine 2019; 46:184-192. [PMID: 31307955 PMCID: PMC6710905 DOI: 10.1016/j.ebiom.2019.07.020] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 06/27/2019] [Accepted: 07/06/2019] [Indexed: 12/17/2022] Open
Abstract
Background Interpretative reading of antimicrobial susceptibility test (AST) results allows inferring biochemical resistance mechanisms from resistance phenotypes. For aminoglycosides, however, correlations between resistance pathways inferred on the basis of the European Committee on Antimicrobial Susceptibility Testing (EUCAST) clinical breakpoints and expert rules versus genotypes are generally poor. This study aimed at developing and validating a decision tree based on resistance phenotypes determined by disc diffusion and based on epidemiological cut-offs (ECOFFs) to infer the corresponding resistance mechanisms in Escherichia coli. Methods Phenotypic antibiotic susceptibility of thirty wild-type and 458 aminoglycoside-resistant E. coli clinical isolates was determined by disc diffusion and the genomes were sequenced. Based on well-defined cut-offs, we developed a phenotype-based algorithm (Aminoglycoside Resistance Mechanism Inference Algorithm - ARMIA) to infer the biochemical mechanisms responsible for the corresponding aminoglycoside resistance phenotypes. The mechanisms inferred from susceptibility to kanamycin, tobramycin and gentamicin were analysed using ARMIA- or EUCAST-based AST interpretation and validated by whole genome sequencing (WGS) of the host bacteria. Findings ARMIA-based inference of resistance mechanisms and WGS data were congruent in 441/458 isolates (96·3%). In contrast, there was a poor correlation between resistance mechanisms inferred using EUCAST CBPs/expert rules and WGS data (418/488, 85·6%). Based on the assumption that resistance mechanisms can result in therapeutic failure, EUCAST produced 63 (12·9%) very major errors (vME), compared to only 2 (0·4%) vME with ARMIA. When used for detection and identification of resistance mechanisms, ARMIA resolved >95% vMEs generated by EUCAST-based AST interpretation. Interpretation This study demonstrates that ECOFF-based analysis of AST data of only four aminoglycosides provides accurate information on the resistance mechanisms in E. coli. Since aminoglycoside resistance mechanisms, despite having in certain cases a minimal effect on the minimal inhibitory concentration, may compromise the bactericidal activity of aminoglycosides, prompt detection of resistance mechanisms is crucial for therapy. Using ARMIA as an interpretative rule set for editing AST results allows for better predictions of in vivo activity of this drug class.
Collapse
Affiliation(s)
- Stefano Mancini
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland.
| | - Martina Marchesi
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| | - Frank Imkamp
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| | - Karoline Wagner
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| | - Peter M Keller
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| | - Chantal Quiblier
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| | - Elias Bodendoerfer
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| | | | - Erik C Böttger
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| |
Collapse
|
30
|
Mancini S, Keller PM, Greiner M, Bruderer V, Imkamp F. Detection of NDM-19, a novel variant of the New Delhi metallo-β-lactamase with increased carbapenemase activity under zinc-limited conditions, in Switzerland. Diagn Microbiol Infect Dis 2019; 95:114851. [PMID: 31285120 DOI: 10.1016/j.diagmicrobio.2019.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 05/28/2019] [Accepted: 06/06/2019] [Indexed: 12/24/2022]
Abstract
A novel New Delhi metallo-β-lactamase (NDM) variant, NDM-19, was identified in a carbapenem-resistant E. coli strain isolated from a subcutaneous infection of a laparotomy scar from an Egyptian patient in a Swiss hospital. NDM-19 is a derivative of NDM-7, from which it differs by a single amino acid substitution (Ala233Val). Under zinc-limiting growth conditions, E. coli DH5α transformants producing NDM-19 displayed reduced susceptibility towards expanded-spectrum cephalosporins and carbapenems as compared to transformants producing NDM-1 or NDM-7.
Collapse
Affiliation(s)
- Stefano Mancini
- University of Zurich, Institute of Medical Microbiology, Zurich, Switzerland.
| | - Peter M Keller
- University of Zurich, Institute of Medical Microbiology, Zurich, Switzerland
| | - Michael Greiner
- University of Zurich, University Hospital of Zurich, Division of Infectious Diseases and Hospital Epidemiology, Zurich, Switzerland
| | - Vera Bruderer
- University of Zurich, Institute of Medical Microbiology, Zurich, Switzerland
| | - Frank Imkamp
- University of Zurich, Institute of Medical Microbiology, Zurich, Switzerland
| |
Collapse
|
31
|
Schineis J, Kron M, Schiele S, Dinkel A, Arsov C, Hadaschik B, Imkamp F, Gschwend J, Herkommer K. PO-01-073 More negative sexual self-concept in men with erectile dysfunction, premature ejaculation or low sexual desire. J Sex Med 2019. [DOI: 10.1016/j.jsxm.2019.03.216] [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: 10/26/2022]
|
32
|
Herkommer K, Hollerer M, Meissner V, Schiele S, Kron M, Albers P, Arsov C, Imkamp F, Hohenfellner M, Hadaschik B, Gschwend J. HP-04-006 Association of sexual identity and activity with prostate-specific antigen (PSA) in a prostate cancer screening population. J Sex Med 2019. [DOI: 10.1016/j.jsxm.2019.03.135] [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: 11/27/2022]
|
33
|
Seth-Smith HMB, Imkamp F, Tagini F, Cuénod A, Hömke R, Jahn K, Tschacher A, Grendelmeier P, Bättig V, Erb S, Reinhard M, Rütimann G, Borrell S, Gagneux S, Casanova C, Droz S, Osthoff M, Tamm M, Nübel U, Greub G, Keller PM, Egli A. Discovery and Characterization of Mycobacterium basiliense sp. nov., a Nontuberculous Mycobacterium Isolated From Human Lungs. Front Microbiol 2019; 9:3184. [PMID: 30671031 PMCID: PMC6331445 DOI: 10.3389/fmicb.2018.03184] [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: 09/19/2018] [Accepted: 12/10/2018] [Indexed: 12/22/2022] Open
Abstract
Bacteria belonging to the genus Mycobacterium are predominantly responsible for pulmonary diseases; most notably Mycobacterium tuberculosis causes granulomatous pulmonary infections. Here we describe a novel slow growing mycobacterial species isolated from respiratory samples from five patients, four with underlying pulmonary disease. The isolates were characterized by biochemical and molecular techniques, including whole genome sequencing. Biochemical characteristics generally match those of M. marinum and M. ulcerans; however, the most striking difference of the new species is its ability to grow at 37°C. The new species was found to grow in human macrophages, but not amoebae, suggesting a pathogenic rather than an environmental lifestyle. Phylogenetic analysis reveals a deep-rooting relationship to M. marinum and M. ulcerans. A complete genome sequence was obtained through combining short and long-read sequencing, providing a genome of 5.6 Mb. The genome appears to be highly intact, syntenic with that of M. marinum, with very few insertion sequences. A vast array of virulence factors includes 283 PE/PPE surface-associated proteins, making up 10% of the coding capacity, and 22 non-ribosomal peptide synthase clusters. A comparison of six clinical isolates from the five patients shows that they differ by up to two single nucleotide polymorphisms, suggesting a common source of infection. Our findings are in accordance with the recognition of a new taxonomic entity. We propose the name M. basiliense, as all isolates were found in patients from the Basel area of Switzerland.
Collapse
Affiliation(s)
- Helena M B Seth-Smith
- Division of Clinical Microbiology, University Hospital Basel, Basel, Switzerland.,Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Florian Tagini
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Aline Cuénod
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Rico Hömke
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland.,National Center for Mycobacteria, Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Kathleen Jahn
- Division of Pneumology, University Hospital Basel, Basel, Switzerland
| | - Anne Tschacher
- Division of Pneumology, Cantonal Hospital Baselland, Liestal, Switzerland
| | - Peter Grendelmeier
- Division of Pneumology, Cantonal Hospital Baselland, Liestal, Switzerland
| | - Veronika Bättig
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Stefan Erb
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Miriam Reinhard
- Swiss Tropical and Public Health Institute, Basel, Switzerland.,University of Basel, Basel, Switzerland
| | | | - Sonia Borrell
- Swiss Tropical and Public Health Institute, Basel, Switzerland.,University of Basel, Basel, Switzerland
| | - Sebastien Gagneux
- Swiss Tropical and Public Health Institute, Basel, Switzerland.,University of Basel, Basel, Switzerland
| | - Carlo Casanova
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Sara Droz
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Michael Osthoff
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel, University of Basel, Basel, Switzerland.,Department of Internal Medicine, University Hospital Basel, Basel, Switzerland
| | - Michael Tamm
- Division of Pneumology, University Hospital Basel, Basel, Switzerland
| | - Ulrich Nübel
- Leibniz Institute DSMZ, German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany.,German Center for Infection Research (DZIF), Braunschweig, Germany
| | - Gilbert Greub
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Peter M Keller
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland.,National Center for Mycobacteria, Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Adrian Egli
- Division of Clinical Microbiology, University Hospital Basel, Basel, Switzerland.,Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| |
Collapse
|
34
|
Wagner K, Imkamp F, Pires VP, Keller PM. Evaluation of Lightmix Mycoplasma macrolide assay for detection of macrolide-resistant Mycoplasma pneumoniae in pneumonia patients. Clin Microbiol Infect 2018; 25:383.e5-383.e7. [PMID: 30391582 DOI: 10.1016/j.cmi.2018.10.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [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: 07/27/2018] [Revised: 10/08/2018] [Accepted: 10/12/2018] [Indexed: 10/28/2022]
Abstract
OBJECTIVES Rapid detection of macrolide resistance-associated mutations in Mycoplasma pneumoniae is crucial for effective antimicrobial treatment. We evaluated the Lightmix Mycoplasma macrolide assay for the detection of point mutations at nucleotide positions 2063 and 2064 in the 23S ribosomal RNA (rRNA) gene of M. pneumoniae that confer macrolide resistance. METHODS Samples from 3438 patients with a respiratory tract infection were analysed by M. pneumoniae real-time PCR, and 208 (6%) of them were tested positive. In this retrospective study, 163 M. pneumoniae real-time PCR-positive samples were analysed by the Lightmix assay, and results were compared to targeted 23S rRNA sequencing. RESULTS Macrolide-resistant M. pneumoniae were found in 15 (9%) of 163 retrospectively analysed samples. The Lightmix assay showed a sensitivity of 100% (95% confidence interval, 78.2-100) and a specificity of 100% (95% confidence interval, 97.5-100) as the detected M. pneumoniae genotype (148 wild type and 15 non-wild type) was confirmed by 23S rRNA sequencing in all samples. CONCLUSIONS The Lightmix assay is an easy-to-use and accurate molecular test that allows rapid determination of macrolide resistance in M. pneumoniae.
Collapse
Affiliation(s)
- K Wagner
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland.
| | - F Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - V P Pires
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - P M Keller
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| |
Collapse
|
35
|
Schneider-Wirth S, Kron M, Schulwitz H, Dinkel A, Arsov C, Hadaschik B, Imkamp F, Gschwend J, Herkommer K. 050 Associations between HIV-status and sexual dysfunction in homosexual men – findings from the German male sex-study. J Sex Med 2018. [DOI: 10.1016/j.jsxm.2018.04.054] [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: 10/28/2022]
|
36
|
Wagner K, Springer B, Imkamp F, Opota O, Greub G, Keller PM. Detection of respiratory bacterial pathogens causing atypical pneumonia by multiplex Lightmix ® RT-PCR. Int J Med Microbiol 2018; 308:317-323. [PMID: 29397298 DOI: 10.1016/j.ijmm.2018.01.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 09/13/2017] [Revised: 01/15/2018] [Accepted: 01/27/2018] [Indexed: 10/18/2022] Open
Abstract
Pneumonia is a severe infectious disease. In addition to common viruses and bacterial pathogens (e.g. Streptococcus pneumoniae), fastidious respiratory pathogens like Chlamydia pneumoniae, Mycoplasma pneumoniae and Legionella spp. can cause severe atypical pneumonia. They do not respond to penicillin derivatives, which may cause failure of antibiotic empirical therapy. The same applies for infections with B. pertussis and B. parapertussis, the cause of pertussis disease, that may present atypically and need to be treated with macrolides. Moreover, these fastidious bacteria are difficult to identify by culture or serology, and therefore often remain undetected. Thus, rapid and accurate identification of bacterial pathogens causing atypical pneumonia is crucial. We performed a retrospective method evaluation study to evaluate the diagnostic performance of the new, commercially available Lightmix® multiplex RT-PCR assay that detects these fastidious bacterial pathogens causing atypical pneumonia. In this retrospective study, 368 clinical respiratory specimens, obtained from patients suffering from atypical pneumonia that have been tested negative for the presence of common agents of pneumonia by culture and viral PCR, were investigated. These clinical specimens have been previously characterized by singleplex RT-PCR assays in our diagnostic laboratory and were used to evaluate the diagnostic performance of the respiratory multiplex Lightmix® RT-PCR. The multiplex RT-PCR displayed a limit of detection between 5 and 10 DNA copies for different in-panel organisms and showed identical performance characteristics with respect to specificity and sensitivity as in-house singleplex RT-PCRs for pathogen detection. The Lightmix® multiplex RT-PCR assay represents a low-cost, time-saving and accurate diagnostic tool with high throughput potential. The time-to-result using an automated DNA extraction device for respiratory specimens followed by multiplex RT-PCR detection was below 4 h, which is expected to significantly improve diagnostics for atypical pneumonia-associated bacterial pathogens.
Collapse
Affiliation(s)
- Karoline Wagner
- Institute of Medical Microbiology, University of Zurich, Switzerland
| | - Burkard Springer
- Institute of Medical Microbiology and Hygiene, Austrian Agency for Health and Food Safety, Graz, Austria
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Switzerland
| | - Onya Opota
- Institute of Microbiology, University of Lausanne and University Hospital Center, Lausanne, Switzerland
| | - Gilbert Greub
- Institute of Microbiology, University of Lausanne and University Hospital Center, Lausanne, Switzerland; Infectious Diseases Service, University Hospital of Lausanne, Lausanne, Switzerland
| | - Peter M Keller
- Institute of Medical Microbiology, University of Zurich, Switzerland.
| |
Collapse
|
37
|
Abela IA, Murer C, Schuurmans MM, Schmitt JW, Muller F, Imkamp F, Mueller NJ, Benden C. A cluster of scedosporiosis in lung transplant candidates and recipients: The Zurich experience and review of the literature. Transpl Infect Dis 2017; 20. [PMID: 29044831 DOI: 10.1111/tid.12792] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 05/18/2017] [Revised: 06/25/2017] [Accepted: 06/26/2017] [Indexed: 12/19/2022]
Abstract
Scedosporium species are fungal pathogens increasingly recognized in cystic fibrosis (CF). They can cause multiresistant, life-threatening infections that are of particular concern in CF patients undergoing lung transplantation, as optimal treatment remains unclear. Here, we describe our Zurich experience of CF patients with Scedosporium infection. Disseminated infection occurred in one patient after transplantation and was successfully treated. We propose a step-by-step approach to treat candidates with colonization, and discuss our cases in the context of the current literature.
Collapse
Affiliation(s)
- Irene A Abela
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Christian Murer
- Division of Pulmonology, University Hospital Zurich, Zurich, Switzerland
| | - Macé M Schuurmans
- Division of Pulmonology, University Hospital Zurich, Zurich, Switzerland
| | - Juergen W Schmitt
- Division of Trauma Surgery, University Hospital Zurich, Zurich, Switzerland
| | - Frabci Muller
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Nicolas J Mueller
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Christian Benden
- Division of Pulmonology, University Hospital Zurich, Zurich, Switzerland
| |
Collapse
|
38
|
Kögel AM, Dinkel A, Marten-Mittag B, Baron J, Albers P, Arsov C, Hadaschik B, Hohenfellner M, Imkamp F, Kuczyk M, Gschwend JE, Herkommer K. [Self-concept and erectile dysfunction in 45-year-old men : Results of a corollary study of the PROBASE trial]. Urologe A 2017; 55:1321-1328. [PMID: 27138634 DOI: 10.1007/s00120-016-0102-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Self-concept consists of self-perceptions and is influenced by the life course of the person. OBJECTIVES This study investigated associations between self-concept and erectile dysfunction (ED) in 45-year-old German men. MATERIALS AND METHODS Forty-five-year-old, heterosexual men who had participated in the PROBASE-study were included. Erectile Function was evaluated using the International Index of Erectile Function (IIEF-6). The presence of ED was defined by IIEF-6 score ≤ 25. Self-concept was assessed using the facets "body image" (three items from the Dresden Body Image Inventory, DKB-35), "perception of masculinity" (three items from the Male Role Norms Scale, MRNS), "perceived social pressure with regard to sexual performance" (four newly constructed items), and "sexual self-esteem" (three newly constructed items). Scores for these facets of self-concept can range from 1 to 5. Higher scores indicate a more positive body image, higher sexual self-esteem, a more modern understanding of masculinity, and greater perceived social pressure. Differences in self-concept between men with ED and without ED were analyzed using the Mann-Whitney-U-test. Furthermore, Cohen's d effect sizes (ES d) were calculated. RESULTS The responses of 3143 men were analyzed. Men with ED (16.2 %) have significantly lower scores regarding body image (mean 3.6 ± 0.6 vs 3.8 ± 0.5; p < 0.001; ES d = -0.5), perception of masculinity (mean 3.4 ± 0.7 vs 3.7 ± 0.6; p < 0.001; ES d = -0.4), and sexual self-esteem (mean 3.6 ± 0.6 vs 3.9 ± 0.5; p < 0.001, ES d = -0.4) than men without ED. Furthermore, they had significantly higher scores for perceived social pressure (mean 2.1 ± 0.7 vs 1.5 ± 0.5; p < 0.001; ES d = 1.2). CONCLUSIONS Self-concept and ED are associated in 45-year-old men. Men with ED have a more negative body image, a more traditional understanding of masculinity, more negative sexual self-esteem, and greater perceived social pressure with regard to sexual performance than men without ED.
Collapse
Affiliation(s)
- A M Kögel
- Klinik und Poliklinik für Urologie, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675, München, Deutschland
| | - A Dinkel
- Klinik und Poliklinik für Psychosomatische Medizin und Psychotherapie, Klinikum rechts der Isar, Technische Universität München, München, Deutschland
| | - B Marten-Mittag
- Klinik und Poliklinik für Psychosomatische Medizin und Psychotherapie, Klinikum rechts der Isar, Technische Universität München, München, Deutschland
| | - J Baron
- Klinik und Poliklinik für Urologie, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675, München, Deutschland
| | - P Albers
- Klinik für Urologie, Medizinische Fakultät, Universität Düsseldorf, Düsseldorf, Deutschland
| | - C Arsov
- Klinik für Urologie, Medizinische Fakultät, Universität Düsseldorf, Düsseldorf, Deutschland
| | - B Hadaschik
- Klinik für Urologie, Universitätsklinikum Heidelberg, Heidelberg, Deutschland
| | - M Hohenfellner
- Klinik für Urologie, Universitätsklinikum Heidelberg, Heidelberg, Deutschland
| | - F Imkamp
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - M Kuczyk
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - J E Gschwend
- Klinik und Poliklinik für Urologie, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675, München, Deutschland
| | - K Herkommer
- Klinik und Poliklinik für Urologie, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675, München, Deutschland.
| |
Collapse
|
39
|
Herkommer K, Hallanzy J, Kron M, Köhn FM, Albers P, Arsov C, Kuczyk M, Imkamp F, Hadaschik B, Hohenfellner M, Gschwend J. PS-07-001 Prevalence of erectile dysfunction in 45-year old German men in association with risk factors and comorbidities-results of the German male sex-study. J Sex Med 2017. [DOI: 10.1016/j.jsxm.2017.03.125] [Citation(s) in RCA: 1] [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: 11/25/2022]
|
40
|
Imkamp F, Keller PM, Böttger EC. Comment on: Delamanid susceptibility testing of
Mycobacterium tuberculosis
using the resazurin microtitre assay and the BACTEC™ MGIT™ 960 system. J Antimicrob Chemother 2016; 71:3624. [DOI: 10.1093/jac/dkw330] [Citation(s) in RCA: 1] [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: 11/14/2022] Open
|
41
|
Fascellaro G, Petrera A, Lai ZW, Nanni P, Grossmann J, Burger S, Biniossek ML, Gomez-Auli A, Schilling O, Imkamp F. Comprehensive Proteomic Analysis of Nitrogen-Starved Mycobacterium smegmatis Δpup Reveals the Impact of Pupylation on Nitrogen Stress Response. J Proteome Res 2016; 15:2812-25. [PMID: 27378031 DOI: 10.1021/acs.jproteome.6b00378] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Pupylation is a bacterial ubiquitin-like protein modification pathway, which results in the attachment of the small protein Pup to specific lysine residues of cellular targets. Pup was shown to serve as a degradation signal, directing proteins toward the bacterial proteasome for turnover. Recently, it was hypothesized that pupylation and proteasomal protein degradation support the survival of Mycobacterium smegmatis (Msm) during nitrogen starvation by supplying recycled amino acids. In the present study we generated a Pup deletion strain to investigate the influence of pupylation on Msm proteome in the absence of nitrogen sources. Quantitative proteomic analyses revealed a relatively low impact of Pup on MsmΔpup proteome immediately after exposure to growth medium lacking nitrogen. Less than 5.4% of the proteins displayed altered cellular levels when compared to Msm wild type. In contrast, post 24 h of nitrogen starvation 501 proteins (41% of the total quantified proteome) of Msm pup deletion strain showed significant changes in abundance. Noteworthy, important players involved in nitrogen assimilation were significantly affected in MsmΔpup. Furthermore, we quantified pupylated proteins of nitrogen-starved Msm to gain more detailed insights in the role of pupylation in surviving and overcoming the lack of nitrogen.
Collapse
Affiliation(s)
| | - Agnese Petrera
- Institute of Molecular Medicine and Cell Research, University of Freiburg , Freiburg, Germany
| | - Zon Weng Lai
- Institute of Molecular Medicine and Cell Research, University of Freiburg , Freiburg, Germany
| | - Paolo Nanni
- Functional Genomic Center, University of Zurich/ETH , Zurich, Switzerland
| | - Jonas Grossmann
- Functional Genomic Center, University of Zurich/ETH , Zurich, Switzerland
| | - Sibylle Burger
- Institute of Medical Microbiology, University of Zurich , Zurich, Switzerland
| | - Martin L Biniossek
- BIOSS Centre for Biological Signaling Studies, University of Freiburg , Freiburg, Germany
| | - Alejandro Gomez-Auli
- Institute of Molecular Medicine and Cell Research, University of Freiburg , Freiburg, Germany.,Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg , Freiburg, Germany.,Faculty of Biology, University of Freiburg , Freiburg, Germany
| | - Oliver Schilling
- Institute of Molecular Medicine and Cell Research, University of Freiburg , Freiburg, Germany.,BIOSS Centre for Biological Signaling Studies, University of Freiburg , Freiburg, Germany.,German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ) , Heidelberg, Germany
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich , Zurich, Switzerland
| |
Collapse
|
42
|
Imkamp F, Ziemski M, Weber-Ban E. Pupylation-dependent and -independent proteasomal degradation in mycobacteria. Biomol Concepts 2016; 6:285-301. [PMID: 26352358 DOI: 10.1515/bmc-2015-0017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 07/08/2015] [Indexed: 02/02/2023] Open
Abstract
Bacteria make use of compartmentalizing protease complexes, similar in architecture but not homologous to the eukaryotic proteasome, for the selective and processive removal of proteins. Mycobacteria as members of the actinobacteria harbor proteasomes in addition to the canonical bacterial degradation complexes. Mycobacterial proteasomal degradation, although not essential during normal growth, becomes critical for survival under particular environmental conditions, like, for example, during persistence of the pathogenic Mycobacterium tuberculosis in host macrophages or of environmental mycobacteria under starvation. Recruitment of protein substrates for proteasomal degradation is usually mediated by pupylation, the post-translational modification of lysine side chains with the prokaryotic ubiquitin-like protein Pup. This substrate recruitment strategy is functionally reminiscent of ubiquitination in eukaryotes, but is the result of convergent evolution, relying on chemically and structurally distinct enzymes. Pupylated substrates are recognized by the ATP-dependent proteasomal regulator Mpa that associates with the 20S proteasome core. A pupylation-independent proteasome degradation pathway has recently been discovered that is mediated by the ATP-independent bacterial proteasome activator Bpa (also referred to as PafE), and that appears to play a role under stress conditions. In this review, mechanistic principles of bacterial proteasomal degradation are discussed and compared with functionally related elements of the eukaryotic ubiquitin-proteasome system. Special attention is given to an understanding on the molecular level based on structural and biochemical analysis. Wherever available, discussion of in vivo studies is included to highlight the biological significance of this unusual bacterial degradation pathway.
Collapse
|
43
|
Wolters M, Wohlatz L, Neumann T, Jutzi S, Peters I, von Klot C, Imkamp F, Lutze B, Kuczyk M, Nagele U, Herrmann T. [Partial Nephrectomy in cT1 Renal Tumours: Conventional Laparoscopic Partial Nephrectomy Compared with LESS Partial Nephrectomy in SITUS Technique]. Aktuelle Urol 2015; 46:453-60. [PMID: 26574950 DOI: 10.1055/s-0041-106151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
BACKGROUND Partial nephrectomy is the treatment of choice for clinical stage 1 renal tumours. Open partial nephrectomy is the standard operative technique. The use of minimally-invasive strategies such as laparoscopic, robot-assisted partial nephrectomy or laparoendoscopic single site (LESS) partial nephrectomy has increased in recent years. PATIENTS/MATERIAL AND METHODS In this retrospective study, patients undergoing laparoscopic partial nephrectomy between December 2008 and November 2013 were evaluated. All patients presented with renal lesions suspicious for malignancy. Operations were performed as conventional laparoscopic transperitoneal partial nephrectomies (cLPN) or LESS partial nephrectomies (LESS-PN) in SITUS technique (single incision transumbilical surgery). The aim of the study was to compare perioperative outcome parameters such as duration of surgery, time of ischaemia, complications, need for transfusion, conversion rates, changes in renal function and duration of hospital stay in both groups. RESULTS A total of 85 laparoscopic partial nephrectomies were performed in this study (72 cLPN and 13 LESS-PN). The average tumour size was 2.68±1.47 cm (cLPN) vs. 2.46±1.11 cm (LESS-PN). The mean duration of surgery was 175.17±50.026 min (cLPN) and 185.77±35.991 min (LESS-PN). 45 (62.5%) operations (cLPN) vs. 10 (76.9%) (LESS-PN) were performed in zero-ischaemia technique. There were no significant differences in perioperative outcome parameters between both groups. Postoperative complication rates (Clavien-Dindo≥3) were 11.1% (cLPN) vs. 7.7% (LESS-PN). CONCLUSIONS LESS partial nephrectomy in SITUS technique is an attractive alternative to conventional laparoscopic and open partial nephrectomy.
Collapse
Affiliation(s)
- M. Wolters
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover
| | - L. Wohlatz
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover
| | - T. Neumann
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover
| | - S. Jutzi
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover
| | - I. Peters
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover
| | - C. von Klot
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover
| | - F. Imkamp
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover
| | - B. Lutze
- Institut für Hygiene/Krankenhaushygiene, Universitätsklinikum Leipzig, Leipzig
| | - M. Kuczyk
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover
| | - U. Nagele
- Klinik für Urologie und Andrologie, Landeskrankenhaus Hall in Tirol (LKH), Hall in Tirol, Österreich
| | - T. Herrmann
- Klinik für Urologie und Urologische Onkologie, Medizinische Hochschule Hannover, Hannover
| |
Collapse
|
44
|
Tewes S, Hüper K, Hartung D, Imkamp F, Herrmann T, Weidemann J, Kuczyk M, Wacker F, Peters I. Evaluation des PIRADS-Scorings für multiparametrische MRT und eines neuen Systems zur gezielten MRT/TRUS-Fusionsbiopsie für die Detektion des klinisch signifikanten Prostatakarzinoms. ROFO-FORTSCHR RONTG 2015. [DOI: 10.1055/s-0035-1551441] [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: 10/23/2022]
|
45
|
Imkamp F, Tolkach Y, Wolters M, Jutzi S, Kramer M, Herrmann T. Initial experiences with the Hemopatch® as a hemostatic agent in zero-ischemia partial nephrectomy. World J Urol 2014; 33:1527-34. [DOI: 10.1007/s00345-014-1404-4] [Citation(s) in RCA: 18] [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: 07/24/2014] [Accepted: 09/10/2014] [Indexed: 11/28/2022] Open
|
46
|
Striebel F, Imkamp F, Özcelik D, Weber-Ban E. Pupylation as a signal for proteasomal degradation in bacteria. Biochim Biophys Acta 2013; 1843:103-13. [PMID: 23557784 DOI: 10.1016/j.bbamcr.2013.03.022] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 02/21/2013] [Accepted: 03/12/2013] [Indexed: 12/23/2022]
Abstract
Posttranslational modifications in the form of covalently attached proteins like ubiquitin (Ub), were long considered an exclusive feature of eukaryotic organisms. The discovery of pupylation, the modification of lysine residues with a prokaryotic, ubiquitin-like protein (Pup), demonstrated that certain bacteria use a tagging pathway functionally related to ubiquitination in order to target proteins for proteasomal degradation. However, functional analogies do not translate into structural or mechanistic relatedness. Bacterial Pup, unlike eukaryotic Ub, does not adopt a β-grasp fold, but is intrinsically disordered. Furthermore, isopeptide bond formation in the pupylation process is carried out by enzymes evolutionary descendent from glutamine synthetases. While in eukaryotes, the proteasome is the main energy-dependent protein degradation machine, bacterial proteasomes exist in addition to other architecturally related degradation complexes, and their specific role along with the role of pupylation is still poorly understood. In Mycobacterium tuberculosis (Mtb), the Pup-proteasome system contributes to pathogenicity by supporting the bacterium's persistence within host macrophages. Here, we describe the mechanism and structural framework of pupylation and the targeting of pupylated proteins to the proteasome complex. Particular attention is given to the comparison of the bacterial Pup-proteasome system and the eukaryotic ubiquitin-proteasome system. Furthermore, the involvement of pupylation and proteasomal degradation in Mtb pathogenesis is discussed together with efforts to establish the Pup-proteasome system as a drug target. This article is part of a Special Issue entitled: Ubiquitin-Proteasome System. Guest Editors: Thomas Sommer and Dieter H. Wolf.
Collapse
Affiliation(s)
- Frank Striebel
- Max Planck Institute of Biochemistry, Department of Molecular Cell Biology, D-82152 Martinsried, Germany
| | | | | | | |
Collapse
|
47
|
Imkamp F, Striebel F, Sutter M, Ozcelik D, Zimmermann N, Sander P, Weber-Ban E. Dop functions as a depupylase in the prokaryotic ubiquitin-like modification pathway. EMBO Rep 2010; 11:791-7. [PMID: 20798673 DOI: 10.1038/embor.2010.119] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2010] [Revised: 07/25/2010] [Accepted: 07/26/2010] [Indexed: 12/21/2022] Open
Abstract
Post-translational modification of proteins with prokaryotic ubiquitin-like protein (Pup) is the bacterial equivalent of ubiquitination in eukaryotes. Mycobacterial pupylation is a two-step process in which the carboxy-terminal glutamine of Pup is first deamidated by Dop (deamidase of Pup) before ligation of the generated γ-carboxylate to substrate lysines by the Pup ligase PafA. In this study, we identify a new feature of the pupylation system by demonstrating that Dop also acts as a depupylase in the Pup proteasome system in vivo and in vitro. Dop removes Pup from substrates by specific cleavage of the isopeptide bond. Depupylation can be enhanced by the unfolding activity of the mycobacterial proteasomal ATPase Mpa.
Collapse
Affiliation(s)
- Frank Imkamp
- Department of Biology, Eidgenössische Technische Hochschule Zurich, Institute of Molecular Biology and Biophysics, Schafmattstrasse 20, Zurich CH-8093, Switzerland
| | | | | | | | | | | | | |
Collapse
|
48
|
Sutter M, Damberger FF, Imkamp F, Allain FHT, Weber-Ban E. Prokaryotic ubiquitin-like protein (Pup) is coupled to substrates via the side chain of its C-terminal glutamate. J Am Chem Soc 2010; 132:5610-2. [PMID: 20355727 DOI: 10.1021/ja910546x] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A prokaryotic protein tagging system called pupylation that is analogous to ubiquitylation in eukaryotes has recently been described. In this process, prokaryotic ubiquitin-like protein (Pup) is coupled to substrate proteins via an isopeptide bond in order to target them for degradation by the proteasome. The ligation occurs via a condensation reaction involving a carboxylate of the C-terminal glutamate of Pup (located in a conserved terminal Gly-Gly-Glu motif) and the side-chain amino group of a substrate lysine. Here we have used a combination of NMR and biochemical experiments with free lysine and a physiological protein substrate (PanB) to show that the coupling occurs through the side-chain carboxylate of the glutamate in the GGE motif rather than the carboxy terminus but that the glutamate must be located at the C-terminal position to be coupled.
Collapse
Affiliation(s)
- Markus Sutter
- Institute of Molecular Biology & Biophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | | | | | | | | |
Collapse
|
49
|
Herrmann TRW, Bach T, Imkamp F, Georgiou A, Burchardt M, Oelke M, Gross AJ. Thulium laser enucleation of the prostate (ThuLEP): transurethral anatomical prostatectomy with laser support. Introduction of a novel technique for the treatment of benign prostatic obstruction. World J Urol 2010; 28:45-51. [DOI: 10.1007/s00345-009-0503-0] [Citation(s) in RCA: 131] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2009] [Accepted: 12/23/2009] [Indexed: 10/20/2022] Open
|
50
|
Imkamp F, Rosenberger T, Striebel F, Keller PM, Amstutz B, Sander P, Weber-Ban E. Deletion of dop in Mycobacterium smegmatis abolishes pupylation of protein substrates in vivo. Mol Microbiol 2009; 75:744-54. [PMID: 20025664 DOI: 10.1111/j.1365-2958.2009.07013.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Proteasome-bearing bacteria make use of a ubiquitin-like modification pathway to target proteins for proteasomal turnover. In a process termed pupylation, proteasomal substrates are covalently modified with the small protein Pup that serves as a degradation signal. Pup is attached to substrate proteins by action of PafA. Prior to its attachment, Pup needs to undergo deamidation at its C-terminal residue, converting glutamine to glutamate. This step is catalysed in vitro by Dop. In order to characterize Dop activity in vivo, we generated a dop deletion mutant in Mycobacterium smegmatis. In the Deltadop strain, pupylation is severely impaired and the steady-state levels of two known proteasomal substrates are drastically increased. Pupylation can be re-established by complementing the mutant with either DopWt or a Pup variant carrying a glutamate at its ultimate C-terminal position (PupGGE). Our data show that Pup is deamidated by Dop in vivo and that likely Dop alone is responsible for this activity. Furthermore, we demonstrate that a putative N-terminal ATP-binding motif is crucial for catalysis, as a single point mutation (E10A) in this motif abolishes Dop activity both in vivo and in vitro.
Collapse
Affiliation(s)
- Frank Imkamp
- ETH Zurich, Institute of Molecular Biology & Biophysics, Zurich, Switzerland
| | | | | | | | | | | | | |
Collapse
|