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Rose TV, Christensen PB, Hjorth P, Madsen LW, Hansen JF, Dröse S, Harvald GB, Røge BT, Øvrehus ALH. Combining cross-sectional survey and register data improved the estimate of hepatitis C prevalence among patients attending a psychiatric emergency department in Denmark. Infect Dis (Lond) 2024; 56:277-284. [PMID: 38150183 DOI: 10.1080/23744235.2023.2298460] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 12/17/2023] [Indexed: 12/28/2023] Open
Abstract
BACKGROUND The prevalence of hepatitis C (HCV) among psychiatric patients is elevated compared to the background population in many studies, but the prevalence among Danish psychiatric patients is unknown. The aim of the study was to determine the HCV prevalence and the proportion of the psychiatric patient population that remains to be diagnosed and treated in a Danish setting. METHODS During a 5-month period, patients attending the psychiatric emergency room in Vejle, Denmark, were offered point-of-care anti-HCV testing. Previous hepatitis C tests for all patients attending the Psychiatric Department in the study period were extracted from the national laboratory database (DANVIR). We combined the survey and register data in a capture-recapture estimate of undiagnosed patients with HCV. RESULTS During the study 24.9% (589 of 2364) patients seen at the psychiatric department attended the emergency room. The prevalence of anti-HCV among those tested in the emergency room was 1.6%. The laboratory register identified 595/2364 patients previously tested for anti-HCV with a positive prevalence of 6.1%. The undiagnosed anti-HCV positives among the 1483 never tested was estimated to 1.1%. Thus the total estimated prevalence of anti-HCV was 2.3% (54/2364, 95% CI 1.7%-3.0%) in the population, of whom 70.4% had been diagnosed, and 72.2% of diagnosed patients had received treatment or cleared HCV. CONCLUSION Combining survey and register data showed that the WHO target of 90% diagnosed and 80% treated was not met. To eliminate HCV in the psychiatric population, both undiagnosed and untreated patients must be targeted.
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Affiliation(s)
- Thomas Vemmelund Rose
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - Peer Brehm Christensen
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - Peter Hjorth
- Department of Psychiatry, Mental Health Services, Region of Southern Denmark, University Hospital of Southern, Vejle Denmark
| | - Lone Wulff Madsen
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark
- Department of Internal Medicine, Hospital Lillebælt-Kolding, Kolding, Denmark
- Department of Regional Health Research, University of Southern Denmark, Odense, Denmark
| | | | - Sandra Dröse
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - Gustav Bang Harvald
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark
| | - Birgit Thorup Røge
- Department of Internal Medicine, Hospital Lillebælt-Kolding, Kolding, Denmark
| | - Anne Lindebo Holm Øvrehus
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
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Dröse S, Øvrehus ALH, Holm DK, Røge BT, Christensen PB. Hepatitis C screening and linkage to care with a mobile clinic in Southern Denmark. Int J Drug Policy 2023; 121:104180. [PMID: 37714009 DOI: 10.1016/j.drugpo.2023.104180] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 08/25/2023] [Accepted: 08/25/2023] [Indexed: 09/17/2023]
Abstract
BACKGROUND Knowing the prevalence of hepatitis C (HCV) in risk groups is essential for elimination. The aim of the study was to assess HCV prevalence among people with different risk profiles and the feasibility of linking people with HCV to care. METHODS In Southern Denmark we tested people who were using shelters, cafés, and facilities for marginalized populations and the general population. We established a mobile clinic for HCV testing offering point-of-care HCV-antibody (HCV-Ab), point-of-care HCV RNA testing, and dried blood spot (DBS) testing. People with HCV infection were linked to care. RESULTS Among 802 tested persons, we found an HCV-Ab /HCV RNA prevalence of 13% (n = 101) /3% (n = 24). We found a prevalence of 20% (n = 97)/5% (n = 24) among 475 persons tested at locations attended by people who inject drugs but 0%/0% when testing the general population. Of 24 people who were HCV RNA positive, 83% (n = 20) initiated treatment, 13% (n = 3) spontaneously cleared their infection, and one was lost to follow-up. CONCLUSION General population testing has limited utility while focus on settings attended by people with increased HCV risk is more feasible. Linkage of people with a current HCV infection to care is feasible.
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Affiliation(s)
- Sandra Dröse
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, DK-5000 Odense C, Denmark; Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, 3. sal, DK-5000 Odense, Denmark; OPEN, Odense Patient data Explorative Network, Odense University Hospital, Odense.
| | - Anne Lindebo Holm Øvrehus
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, DK-5000 Odense C, Denmark; Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, 3. sal, DK-5000 Odense, Denmark
| | - Dorte Kinggaard Holm
- Department of Clinical Immunology, Odense University Hospital, J. B. Winsloews Vej 4, DK-5000 Odense C Odense, Denmark
| | - Birgit Thorup Røge
- Department of Medicine, Lillebaelt Hospital, Sygehusvej 24, DK-6000 Kolding, Denmark
| | - Peer Brehm Christensen
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, DK-5000 Odense C, Denmark; Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, 3. sal, DK-5000 Odense, Denmark
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Abstract
BACKGROUND The goal of the C-Free-South project is to eliminate hepatitis C (HCV) in the Region of Southern Denmark (1.2 million inhabitants). One target group consists of people with HCV who had received care but were lost to follow-up. The study aim was to evaluate program efficacy in locating these patients and getting them into care. METHODS Patients were contacted if they were HCV-RNA positive and age 18+ years, registered in the clinical hepatitis database as of November 1, 2019, and had no scheduled HCV-related appointment. They were contacted at 2-month intervals by phone or letter. For patients who did not respond, we asked their general practitioner to refer them, if possible. RESULTS We identified 69 (7%) patients in the database who were listed as untreated and not being followed up. We successfully contacted 54 (78%), and the remaining 15 (22%) did not respond to our contacts. To date, 45 (65%) had initiated treatment, one (1%) had rejected treatment, and eight (12%) did not show up to their appointments. Among those receiving treatment, 20 (44%) responded after the first contact, 18 (40%) after the second contact, and 7 (16%) after informing the general practitioner. CONCLUSION An intensified and persistent effort made it possible to reach most HCV patients lost to follow-up. All new contact attempts increased the possibility that patients would receive treatment. Nevertheless, 22% of HCV patients lost to follow-up did not respond to repeated contact attempts.
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Affiliation(s)
- Sandra Dröse
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | | | | | - Anne Lindebo Holm Øvrehus
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - Peer Brehm Christensen
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
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4
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Dröse S, Øvrehus ALH, Holm DK, Madsen LW, Mössner BK, Søholm J, Hansen JF, Røge BT, Christensen PB. A multi-level intervention to eliminate hepatitis C from the Region of Southern Denmark: the C-Free-South project. BMC Infect Dis 2022; 22:202. [PMID: 35232372 PMCID: PMC8889755 DOI: 10.1186/s12879-022-07196-7] [Citation(s) in RCA: 4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 02/22/2022] [Indexed: 11/16/2022] Open
Abstract
Denmark has signed the WHO strategy to eliminate hepatitis C virus (HCV). In the absence of a national strategy for elimination, a local action plan was developed in the Region of Southern Denmark (RSD). The aim of the strategy is to diagnose 90% of HCV-infected persons and treat 80% of those diagnosed by 2025. The strategy was developed by reviewing Danish data on HCV epidemiology and drug use to identify key populations for screening, linkage to care, and treatment. Based on available published data from 2016, an estimated 3028 persons in the RSD were HCV-RNA positive (population prevalence 0.21%). Of these, 1002 were attending clinical care, 1299 were diagnosed but not in clinical care, and 727 were undiagnosed. Three different interventions targeting the HCV-infected population and two interventions for HCV surveillance are planned to achieve elimination. The “C-Free-South” strategy aims to eliminate HCV in our region by identifying (90%) and treating (80%) of infected persons by the end of 2025, 5 years earlier than the WHO elimination target date.
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Affiliation(s)
- Sandra Dröse
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, 5000, Odense C, Denmark. .,Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, 3. sal, 5000, Odense, Denmark.
| | - Anne Lindebo Holm Øvrehus
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, 5000, Odense C, Denmark.,Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, 3. sal, 5000, Odense, Denmark
| | - Dorte Kinggaard Holm
- Department of Clinical Immunology, Odense University Hospital, 29 J. B. Winsloews Vej 4, Indgang 8, Odense C, 5000, Odense, Denmark
| | - Lone Wulff Madsen
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, 5000, Odense C, Denmark.,Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, 3. sal, 5000, Odense, Denmark
| | - Belinda Klemmensen Mössner
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, 5000, Odense C, Denmark.,Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, 3. sal, 5000, Odense, Denmark
| | - Jacob Søholm
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, 5000, Odense C, Denmark
| | - Janne Fuglsang Hansen
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, 5000, Odense C, Denmark
| | - Birgit Thorup Røge
- Department of Medicine, Lillebaelt Hospital, Sygehusvej 24, 6000, Kolding, Denmark
| | - Peer Brehm Christensen
- Department of Infectious Diseases, Odense University Hospital, J. B. Winsloews Vej 4, Indgang 18 Penthouse 2. sal, 5000, Odense C, Denmark. .,Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, 3. sal, 5000, Odense, Denmark.
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Tinggaard M, Slotved HC, Fuursted K, Storgaard M, Dröse S, Johansen IS, Thorsteinsson K, Kronborg G, Lebech AM, Benfield T. Oral and anal carriage of Streptococcus pneumoniae among sexually active men with HIV who have sex with men. J Infect Dis 2021; 225:1575-1580. [PMID: 34622276 DOI: 10.1093/infdis/jiab512] [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: 04/26/2021] [Accepted: 10/04/2021] [Indexed: 11/12/2022] Open
Abstract
People with HIV are at increased risk of pneumococcal disease. We investigate oral and anal carriage rates of Streptococcus pneumoniae by molecular methods among 82 men with HIV who have sex with men (MSM). A questionnaire, oral wash and anal swab samples were obtained at baseline and 12 months. Oral carriage rates were 32.9% (27/82) at baseline and 41.7% (30/72) at follow-up. Anal carriage rates were 2.4% (2/82) at baseline and 2.9% (2/70) at follow-up. Genogroup 24 was predominant. Results suggest high oral carriage rates of S. pneumoniae among MSM living with HIV. A minority were anal carriers.
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Affiliation(s)
- Michaela Tinggaard
- Department of Infectious Diseases, Copenhagen University Hospital - Amager and Hvidovre, Hvidovre, Denmark
| | - Hans-Christian Slotved
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Kurt Fuursted
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Merete Storgaard
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark
| | - Sandra Dröse
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark.,Research Unit for Infectious Diseases, Odense University Hospital, University of Southern Denmark, Denmark
| | - Isik Somuncu Johansen
- Department of Infectious Diseases, Odense University Hospital, Odense, Denmark.,Research Unit for Infectious Diseases, Odense University Hospital, University of Southern Denmark, Denmark
| | - Kristina Thorsteinsson
- Department of Infectious Diseases, Copenhagen University Hospital - Amager and Hvidovre, Hvidovre, Denmark
| | - Gitte Kronborg
- Department of Infectious Diseases, Copenhagen University Hospital - Amager and Hvidovre, Hvidovre, Denmark.,Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anne-Mette Lebech
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Infectious Diseases, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Thomas Benfield
- Department of Infectious Diseases, Copenhagen University Hospital - Amager and Hvidovre, Hvidovre, Denmark.,Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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6
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Thiepold A, Foltyn M, Urban H, Voss M, Hofmann U, Dröse S, Harter PN, Mittelbronn M, Steinbach JP, Ronellenfitsch MW. P01.31 Mammalian target of rapamycin complex 1 activation sensitizes human glioma cells to hypoxia-induced cell death. Neuro Oncol 2017. [DOI: 10.1093/neuonc/nox036.107] [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: 11/14/2022] Open
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7
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Weis N, Cowan S, Hallager S, Dröse S, Kristensen LH, Grønbæk K, Jensen J, Gerstoft J, Madsen LG, Clausen MR, Lunding S, Tarp BD, Barfod TS, Sloth S, Holm DK, Jensen J, Krarup H. Vertical transmission of hepatitis B virus during pregnancy and delivery in Denmark. Scand J Gastroenterol 2017; 52:178-184. [PMID: 27796133 DOI: 10.1080/00365521.2016.1244704] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [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] [Indexed: 02/04/2023]
Abstract
OBJECTIVE In Denmark, pregnant women have been screened for hepatitis B virus (HBV) since 2005, and children born to HBV-infected mothers offered hepatitis B immunoglobulin at birth, vaccination against HBV at birth and after 1, 2 and 12 months. The purpose of this study was to determine the risk of vertical HBV transmission in children born to mothers with chronic HBV infection, to investigate the antibody response in the children and to investigate possible maternal predictive risk factors for HBV transmission. MATERIALS AND METHODS Through the Danish Database for Hepatitis B and C, we identified 589 HBV-infected women who had given birth to 686 children, of whom 370 children were born to 322 women referred to hospital. 132 (36%) children, born to 109 mothers, were included in the study; 128 children had blood samples tested for HBsAg, anti-HBc (total), anti-HBs and HBV-DNA and four children had saliva samples tested for anti-HBc. RESULTS We found vertical HBV transmission in Denmark to be 2.3% [95% CI: 0.5, 6.5], a high proportion of HBsAg-negative children with low levels of anti-HBs (18.4%) and a high proportion (15.2%) with resolved HBV infection. No maternal risk factor was statistically significantly associated with HBV vertical transmission. CONCLUSION In a HBV low prevalence setting as Denmark, despite a national vaccination program, vertical HBV transmission occurred in 2.3% of children born to HBV-infected mothers. In addition, a high proportion of the children had insufficient anti-HBs levels and a high proportion had serological signs of resolved HBV infection.
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Affiliation(s)
- Nina Weis
- a Department of Infectious Diseases , Copenhagen University Hospital , Hvidovre , Denmark.,b Department of Clinical Medicine, Faculty of Health and Medical Sciences , University of Copenhagen , Copenhagen , Denmark
| | - Susan Cowan
- c Department of Epidemiology , Statens Serum Institut , Copenhagen , Denmark
| | - Sofie Hallager
- a Department of Infectious Diseases , Copenhagen University Hospital , Hvidovre , Denmark
| | - Sandra Dröse
- d Department of Infectious Diseases , Odense University Hospital , Odense, Denmark
| | | | - Karin Grønbæk
- f Department of Gastroenterology , Copenhagen University Hospital , Hvidovre , Denmark
| | - Janne Jensen
- g Department of Medicine , Kolding Hospital , Denmark
| | - Jan Gerstoft
- h Department of Infectious Diseases , Copenhagen University Hospital , Rigshospitalet , Denmark
| | - Lone G Madsen
- i Department of Medicine , Køge Hospital , Køge , Denmark
| | - Mette Rye Clausen
- j Department of Hepatology , Copenhagen University Hospital , Rigshospitalet , Denmark
| | - Suzanne Lunding
- k Department of Infectious Diseases , Nordsjællands Hospital , Hillerød , Denmark
| | - Britta D Tarp
- l Diagnostic Center , Silkeborg Regional Hospital , Silkeborg , Denmark
| | - Toke S Barfod
- m Department of Infectious Diseases , Roskilde Hospital , Roskilde, Denmark
| | - Stine Sloth
- n Department of Gastroenterology , Medical Section, Copenhagen University Hospital , Herlev , Denmark
| | - Dorte Kinggaard Holm
- o Department of Clinical Immunology , Odense University Hospital , Odense , Denmark
| | - Jesper Jensen
- a Department of Infectious Diseases , Copenhagen University Hospital , Hvidovre , Denmark
| | - Henrik Krarup
- p Section of Molecular Diagnostics, Clinical Biochemistry and Department of Medical Gastroenterology , Aalborg University Hospital , Aalborg , Denmark
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8
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Thiepold AL, Foltyn M, Urban H, Heller S, Dröse S, Harter PN, Mittelbronn M, Steinbach JP, Ronellenfitsch MW. P01.03 mTORC1 activation sensitizes human malignant glioma cells to hypoxia-induced cell death by increasing O2-consumption. Neuro Oncol 2016. [DOI: 10.1093/neuonc/now188.060] [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: 11/14/2022] Open
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Guillaud F, Dröse S, Kowald A, Brandt U, Klipp E. Superoxide production by cytochrome bc1 complex: A mathematical model. Biochimica et Biophysica Acta (BBA) - Bioenergetics 2014; 1837:1643-52. [DOI: 10.1016/j.bbabio.2014.05.358] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Revised: 05/28/2014] [Accepted: 05/30/2014] [Indexed: 12/17/2022]
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Radermacher M, Ruiz T, Fowler DJ, Yu L, Dröse S, Krack S, Kerscher S, Zickermann V, Brandt U. 3D Reconstruction of a Subcomplex of NADH-ubiquinone-oxidoreductase (Complex I) from Yarrowia lipolytica. Microsc Microanal 2011; 17:90-91. [PMID: 22267954 PMCID: PMC3261754 DOI: 10.1017/s1431927611001334] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.
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Affiliation(s)
- M Radermacher
- University of Vermont, College of Medicine, Dept. Molecular Physiology and Biophysics, 149 Beaumont Ave, Burlington, VT, USA
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11
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Hauptmann S, Scherping I, Dröse S, Brandt U, Schulz K, Jendrach M, Leuner K, Eckert A, Müller W. Mitochondrial dysfunction: An early event in Alzheimer pathology accumulates with age in AD transgenic mice. Neurobiol Aging 2009; 30:1574-86. [DOI: 10.1016/j.neurobiolaging.2007.12.005] [Citation(s) in RCA: 286] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Revised: 12/03/2007] [Accepted: 12/05/2007] [Indexed: 01/17/2023]
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12
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Abstract
In renal carcinoma cells (RCC4) hypoxia inducible factor-1 (HIF-1) is constitutively expressed due to a von Hippel Lindau protein deficiency, but can be degraded by calpain, independently of the 26S proteasome, when exposed to hypoxia/nitric oxide (NO). In this study we examined molecular mechanisms to explain calpain activation. The inability of hypoxia/NO to degrade HIF-1alpha in respiratory-deficient RCC4-rho0 cells pointed to the requirement for mitochondria-derived reactive oxygen species. A prerequisite for O(2)(-) in combination with NO to destabilize HIF-1alpha was corroborated in RCC4-rho0 cells, when the redox cycler 2,3-dimethoxy-1,4-naphthoquinone was used as a source of superoxide. Degradation of HIF-1alpha required intracellular calcium transients and calpain activation. Using uric acid to interfere with signal transmission elicited by NO/O(2)(-) blocked HIF-1alpha degradation and attenuated a calcium increase. We conclude that an oxidative signal as a result of NO/O(2)(-) coformation triggers a calcium increase that activates calpain to degrade HIF-1alpha, independently of the proteasome.
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Affiliation(s)
- B Herr
- Institute of Biochemistry I, Pathobiochemistry, Faculty of Medicine, Johann Wolfgang Goethe-University, Theodor-Stern-Kai 7, 60590, Frankfurt, Germany
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13
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Brandt U, Abdrakhmanova A, Zickermann V, Galkin A, Dröse S, Zwicker K, Kerscher S. Structure-function relationships in mitochondrial complex I of the strictly aerobic yeast Yarrowia lipolytica. Biochem Soc Trans 2005; 33:840-4. [PMID: 16042611 DOI: 10.1042/bst0330840] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The obligate aerobic yeast Yarrowia lipolytica has been established as a powerful model system for the analysis of mitochondrial complex I. Using a combination of genomic and proteomic approaches, a total of 37 subunits was identified. Several of the accessory subunits are predicted to be STMD (single transmembrane domain) proteins. Site-directed mutagenesis of Y. lipolytica complex I has provided strong evidence that a significant part of the ubiquinone reducing catalytic core resides in the 49 kDa and PSST subunits and can be modelled using X-ray structures of distantly related enzymes, i.e. water-soluble [NiFe] hydrogenases from Desulfovibrio spp. Iron-sulphur cluster N2, which is related to the hydrogenase proximal cluster, is directly involved in quinone reduction. Mutagenesis of His226 and Arg141 of the 49 kDa subunit provided detailed insight into the structure-function relationships around cluster N2. Overall, our findings suggest that proton pumping by complex I employs long-range conformational interactions and ubiquinone intermediates play a critical role in this mechanism.
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Affiliation(s)
- U Brandt
- Universität Frankfurt, Zentrum der Biologischen Chemie, Molekulare Bioenergetik, Theodor-Stern-Kai 7, Haus 26, D-60590 Frankfurt am Main, Germany.
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14
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Dröse S, Boddien C, Gassel M, Ingenhorst G, Zeeck A, Altendorf K. Semisynthetic derivatives of concanamycin A and C, as inhibitors of V- and P-type ATPases: structure-activity investigations and developments of photoaffinity probes. Biochemistry 2001; 40:2816-25. [PMID: 11258892 DOI: 10.1021/bi001759q] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
V-type ATPases are inhibited by the plecomacrolides bafilomycin and concanamycin, which exert their inhibitory potential at nanomolar concentrations. In addition, some P-type ATPases are inhibited at micromolar concentrations. We initiated intensive structure-activity investigations with semisynthetic concanamycin derivatives to approach the following two questions: (i) What is the pharmacophor, the structural key element, of the plecomacrolides that leads to their inhibitory potential against V- and P-type ATPases? (ii) Where is the binding site within these two different types of ATPases? In a first step, we examined where chemical modifications (O-acylations, substitutions, eliminations) could be placed without seriously affecting the inhibitory potential of the macrolides. In a second step, we used the knowledge of these structure-activity investigations to introduce traceable elements (fluorescent or radioactive) or nitrene-generating azido or carbene-generating diazirine-groups able to bind the inhibitors to their target covalently. These studies led finally to the synthesis of two photoaffinity probes that were used in labeling experiments with the purified plasma membrane V-type ATPase of Manduca sexta (described in a following paper, Huss, M., Gassel, M., Ingenhorst, G., Dröse, S., Zeeck, A., Altendorf, K., Wieczorek, H., manuscript submitted).
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Affiliation(s)
- S Dröse
- Fachbereich Biologie/Chemie, Universität Osnabrück, Barbarastrasse 11, Arbeitsgruppe Mikrobiologie, D-49076 Osnabrück, Germany
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15
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Schrader M, Fendler K, Bamberg E, Gassel M, Epstein W, Altendorf K, Dröse S. Replacement of glycine 232 by aspartic acid in the KdpA subunit broadens the ion specificity of the K(+)-translocating KdpFABC complex. Biophys J 2000; 79:802-13. [PMID: 10920013 PMCID: PMC1300979 DOI: 10.1016/s0006-3495(00)76337-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Replacement of glycine residue 232 with aspartate in the KdpA subunit of the K(+)-translocating KdpFABC complex of Escherichia coli leads to a transport complex that has reduced affinity for K(+) and has lost the ability to discriminate Rb(+) ions (, J. Biol. Chem. 270:6678-6685). This glycine residue is the first in a highly conserved GGG motif that was aligned with the GYG sequence of the selectivity filter (P- or H5-loop) of K(+) channels (, Nature. 371:119-122). Investigations with the purified and reconstituted KdpFABC complex using the potential sensitive fluorescent dye DiSC(3)(5) and the "caged-ATP/planar bilayer method" confirm the altered ion specificity observed in uptake measurements with whole cells. In the absence of cations a transient current was observed in the planar bilayer measurements, a phenomenon that was previously observed with the wild-type enzyme and with another kdpA mutant (A:Q116R) and most likely represents the movement of a protein-fixed charge during a conformational transition. After addition of K(+) or Rb(+), a stationary current could be observed, representing the continuous pumping activity of the KdpFABC complex. In addition, DiSC(3)(5) and planar bilayer measurements indicate that the A:G232D Kdp-ATPase also transports Na(+), Li(+), and H(+) with a reduced rate. Similarities to mutations in the GYG motif of K(+) channels are discussed.
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Affiliation(s)
- M Schrader
- Max-Planck-Institut für Biophysik, D-60596 Frankfurt am Main, Germany
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Fendler K, Dröse S, Epstein W, Bamberg E, Altendorf K. The Kdp-ATPase of Escherichia coli mediates an ATP-dependent, K+-independent electrogenic partial reaction. Biochemistry 1999; 38:1850-6. [PMID: 10026265 DOI: 10.1021/bi982238u] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Charge transport by the K+ transporting Kdp-ATPase from Escherichia coli was investigated using planar lipid membranes to which liposomes reconstituted with the enzyme were adsorbed. To study reactions in the absence of K+, given some contamination of solutions with K+, we used a mutant of Kdp whose affinity for K+ was 6 mM instead of the wild-type whose affinity is 2 microM. Upon rapid release of ATP from caged ATP, a transient current occurred in the absence of K+. In the presence of K+, a stationary current was seen. On the basis of their structural similarity, we propose a kinetic model for the Kdp-ATPase analogous to that of the Na+K+-ATPase. In this model, the first, K+-independent step is electrogenic and corresponds to the outward transport of a negative charge. The second, K+-translocating step is probably also electrogenic and corresponds to transport of positive charge to the intracellular side of the protein.
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Affiliation(s)
- K Fendler
- Max-Planck-Institut für Biophysik, Frankfurt/M, Germany
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Altendorf K, Gassel M, Puppe W, Möllenkamp T, Zeeck A, Boddien C, Fendler K, Bamberg E, Dröse S. Structure and function of the Kdp-ATPase of Escherichia coli. Acta Physiol Scand Suppl 1998; 643:137-46. [PMID: 9789555] [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] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The kdpFABC operon of Escherichia coli consists of the four structural genes kdpF, kdpA, kdpB, and kdpC. Expression of the kdpF gene was demonstrated using minicells of E. coli. In addition, it was shown that the KdpF subunit remains associated with the purified complex. Although KdpF is not essential in vivo, the purified complex lacking KdpF exhibits hardly any K(+)-stimulated ATPase activity. This clearly demonstrates that the KdpF subunit is stabilizing the transport complex. Charge translocation by the purified Kdp-ATPase was measured with the potential-sensitive dye DiSC3(5) using proteoliposomes. Upon addition of ATP a fluorescence quench was observed indicating the buildup of a negative potential inside the proteoliposomes. Using the Kdp-ATPase derived from a mutant strain, in which the K(m) value for K+ (1,2 mM) was almost identical to that of Rb+ (1.4 mM), the same fluorescence quench was observed when K+ or Rb+ were present in the lumen of the proteoliposomes. These data clearly indicate that the Kdp-ATPase transports K+ in an electrogenic manner. In order to identify the binding site(s) for the inhibitor concanamycin A within the Kdp complex, concanamycin A was synthesized. Using this compound labeling of KdpA and KdpB, but not of KdpC, could be shown with the purified complex. When everted vesicles were used only KdpB could be labeled.
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Affiliation(s)
- K Altendorf
- Universität Osnabrück, Fachbereich Biologie/Chemie, Abteilung Mikrobiologie, Germany.
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Abstract
Bafilomycins and concanamycins, two groups of the plecomacrolide-defined class of macrolide antibiotics, have recently been recognized as important tools for studying the physiological role of vacuolar-type, proton-translocating ATPases (V-ATPases) and ATPases with phosphorylated states (P-ATPases) in animal and plant cells as well as in yeast, fungi and bacteria. The following review will give an account of the classification and function of these antibiotics.
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Affiliation(s)
- S Dröse
- Universität Osnabrück, Fachbereich Biologie/Chemie, Germany
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Abstract
Charge translocation by the Kdp-ATPase of Escherichia coli was measured by adsorption of proteoliposomes to a planar lipid membrane. The proteoliposomes were prepared by reconstitution of purified Kdp-ATPase into liposomes prepared from E. coli lipids. The protein was activated by a ATP concentration jump produced by photolysis of a protected derivative of ATP, caged ATP. Charge translocation was measured with a time resolution of 15-40 ms. Stationary currents demonstrated the continuous pumping activity of the enzyme. Control measurements with the potential-sensitive dye DiSC3(5) showed a negative potential inside the proteoliposomes after activation with ATP. The measured electrical signals as well as the dye measurements correspond to the transport of positive charge to the intracellular face of the protein. The electrical signal was increased when K+ was inside the proteoliposomes (K0.5 approximately 50 microM) and was inhibited by vanadate. These experiments demonstrate the electrogeneity of the Kdp-ATPase in a purified reconstituted system.
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Affiliation(s)
- K Fendler
- Max-Planck-Institut für Biophysik, Frankfurt/M, Germany
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Dröse S, Bindseil KU, Bowman EJ, Siebers A, Zeeck A, Altendorf K. Inhibitory effect of modified bafilomycins and concanamycins on P- and V-type adenosinetriphosphatases. Biochemistry 1993; 32:3902-6. [PMID: 8385991 DOI: 10.1021/bi00066a008] [Citation(s) in RCA: 322] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Various ATPases have been tested for their sensitivity to naturally occurring unusual macrolides and their chemically modified derivatives, which are structurally related to bafilomycin A1 (1), the first specific inhibitor of vacuolar ATPases. The structure-activity study showed that in general the concanamycins, 18-membered macrolides, are better and more specific inhibitors than the bafilomycins of this class of membrane-bound ATPases. The additional carbohydrate residue is not responsible for the improved activity. The importance of an intact hemiketal ring, which is part of an intramolecular hydrogen-bonding network, and the effects of the size of the macrolactone ring are discussed. The structurally related elaiophylin (13), a C2-symmetric macrodiolide antibiotic, proved to be inactive on vacuolar ATPases but still retained its inhibitory effect on P-type ATPases.
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Affiliation(s)
- S Dröse
- Fachbereich Biologie/Chemie, Universität Osnabrück, FRG
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