1
|
F Fernández S, Poteser M, Govarts E, Pardo O, Coscollà C, Schettgen T, Vogel N, Weber T, Murawski A, Kolossa-Gehring M, Rüther M, Schmidt P, Namorado S, Van Nieuwenhuyse A, Appenzeller B, Ólafsdóttir K, Halldorsson TI, Haug LS, Thomsen C, Barbone F, Mariuz M, Rosolen V, Rambaud L, Riou M, Göen T, Nübler S, Schäfer M, Zarrabi KHA, Sepai O, Martin LR, Schoeters G, Gilles L, Leander K, Moshammer H, Akesson A, Laguzzi F. Publisher Correction: Determinants of exposure to acrylamide in European children and adults based on urinary biomarkers: results from the "European Human Biomonitoring Initiative" HBM4EU participating studies. Sci Rep 2024; 14:2405. [PMID: 38287129 PMCID: PMC10825204 DOI: 10.1038/s41598-024-52775-0] [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: 01/31/2024] Open
Affiliation(s)
- Sandra F Fernández
- Foundation for the Promotion of Health and Biomedical Research in the Valencian Region, FISABIO-Public Health, Av. Catalunya, 21, 46020, Valencia, Spain
| | - Michael Poteser
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, Vienna, Austria
| | - Eva Govarts
- VITO Health, Flemish Institute for Technological Research (VITO), Mol, Belgium
| | - Olga Pardo
- Public Health Directorate of Valencia, Av. Catalunya, 21, 46020, Valencia, Spain
- Department of Analytical Chemistry, University of Valencia, Doctor Moliner 50, 46100, Burjassot, Spain
| | - Clara Coscollà
- Foundation for the Promotion of Health and Biomedical Research in the Valencian Region, FISABIO-Public Health, Av. Catalunya, 21, 46020, Valencia, Spain
| | - Thomas Schettgen
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Pauwelsstrasse 30, 52074, Aachen, Germany
| | - Nina Vogel
- German Environment Agency (UBA), Dessau-Roßlau, Berlin, Germany
| | - Till Weber
- German Environment Agency (UBA), Dessau-Roßlau, Berlin, Germany
| | - Aline Murawski
- German Environment Agency (UBA), Dessau-Roßlau, Berlin, Germany
| | | | - Maria Rüther
- German Environment Agency (UBA), Dessau-Roßlau, Berlin, Germany
| | | | - Sónia Namorado
- Department of Epidemiology, National Institute of Health Doutor Ricardo Jorge, Lisbon, Portugal
- Comprehensive Health Research Center, Universidade NOVA de Lisboa, Lisbon, Portugal
- Public Health Research Centre, NOVA National School of Public Health, Universidade NOVA de Lisboa, Lisbon, Portugal
| | | | - Brice Appenzeller
- Human Biomonitoring Research Unit, Department of Precision Health, Luxembourg Institute of Health (LIH), 1 A-B, Rue Thomas Edison, 1445, Strassen, Luxembourg
| | - Kristín Ólafsdóttir
- Department of Pharmacology and Toxicology, University of Iceland, Reykjavík, Iceland
| | - Thorhallur I Halldorsson
- Faculty of Food Science and Nutrition, School of Health Sciences, University of Iceland, Reykjavík, Iceland
| | - Line S Haug
- Norwegian Institute of Public Health, Lovisenberggata 8, 0456, Oslo, Norway
| | - Cathrine Thomsen
- Norwegian Institute of Public Health, Lovisenberggata 8, 0456, Oslo, Norway
| | - Fabio Barbone
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Ospedale di Cattinara, Strada di Fiume 447, 34149, Trieste, Italy
| | - Marika Mariuz
- Central Directorate for Health, Social Policies and Disability, Friuli Venezia Giulia Region, Riva Nazario Sauro, 8, 34124, Trieste, Italy
| | - Valentina Rosolen
- Central Directorate for Health, Social Policies and Disability, Friuli Venezia Giulia Region, Riva Nazario Sauro, 8, 34124, Trieste, Italy
| | - Loïc Rambaud
- Santé Publique France, SpFrance, 12, Rue du Val d'Osne, 94415, Saint-Maurice, France
| | - Margaux Riou
- Santé Publique France, SpFrance, 12, Rue du Val d'Osne, 94415, Saint-Maurice, France
| | - Thomas Göen
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 9-11, 91054, Erlangen, Germany
| | - Stefanie Nübler
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 9-11, 91054, Erlangen, Germany
| | - Moritz Schäfer
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 9-11, 91054, Erlangen, Germany
| | - Karin H A Zarrabi
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 9-11, 91054, Erlangen, Germany
| | | | | | - Greet Schoeters
- VITO Health, Flemish Institute for Technological Research (VITO), Mol, Belgium
- Department of Biomedical Sciences, University of Antwerp, 2610, Antwerp, Belgium
| | - Liese Gilles
- VITO Health, Flemish Institute for Technological Research (VITO), Mol, Belgium
| | - Karin Leander
- Unit of Cardiovascular and Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Nobels Väg 13, Box 210, 17177, Stockholm, Sweden
| | - Hanns Moshammer
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, Vienna, Austria
| | - Agneta Akesson
- Unit of Cardiovascular and Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Nobels Väg 13, Box 210, 17177, Stockholm, Sweden
| | - Federica Laguzzi
- Unit of Cardiovascular and Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Nobels Väg 13, Box 210, 17177, Stockholm, Sweden.
| |
Collapse
|
2
|
F Fernández S, Poteser M, Govarts E, Pardo O, Coscollà C, Schettgen T, Vogel N, Weber T, Murawski A, Kolossa-Gehring M, Rüther M, Schmidt P, Namorado S, Van Nieuwenhuyse A, Appenzeller B, Ólafsdóttir K, Halldorsson TI, Haug LS, Thomsen C, Barbone F, Mariuz M, Rosolen V, Rambaud L, Riou M, Göen T, Nübler S, Schäfer M, Zarrabi KHA, Sepai O, Martin LR, Schoeters G, Gilles L, Leander K, Moshammer H, Akesson A, Laguzzi F. Determinants of exposure to acrylamide in European children and adults based on urinary biomarkers: results from the "European Human Biomonitoring Initiative" HBM4EU participating studies. Sci Rep 2023; 13:21291. [PMID: 38042944 PMCID: PMC10693547 DOI: 10.1038/s41598-023-48738-6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 11/29/2023] [Indexed: 12/04/2023] Open
Abstract
Little is known about exposure determinants of acrylamide (AA), a genotoxic food-processing contaminant, in Europe. We assessed determinants of AA exposure, measured by urinary mercapturic acids of AA (AAMA) and glycidamide (GAMA), its main metabolite, in 3157 children/adolescents and 1297 adults in the European Human Biomonitoring Initiative. Harmonized individual-level questionnaires data and quality assured measurements of AAMA and GAMA (urine collection: 2014-2021), the short-term validated biomarkers of AA exposure, were obtained from four studies (Italy, France, Germany, and Norway) in children/adolescents (age range: 3-18 years) and six studies (Portugal, Spain, France, Germany, Luxembourg, and Iceland) in adults (age range: 20-45 years). Multivariable-adjusted pooled quantile regressions were employed to assess median differences (β coefficients) with 95% confidence intervals (95% CI) in AAMA and GAMA (µg/g creatinine) in relation to exposure determinants. Southern European studies had higher AAMA than Northern studies. In children/adolescents, we observed significant lower AA associated with high socioeconomic status (AAMA:β = - 9.1 µg/g creatinine, 95% CI - 15.8, - 2.4; GAMA: β = - 3.4 µg/g creatinine, 95% CI - 4.7, - 2.2), living in rural areas (AAMA:β = - 4.7 µg/g creatinine, 95% CI - 8.6, - 0.8; GAMA:β = - 1.1 µg/g creatinine, 95% CI - 1.9, - 0.4) and increasing age (AAMA:β = - 1.9 µg/g creatinine, 95% CI - 2.4, - 1.4; GAMA:β = - 0.7 µg/g creatinine, 95% CI - 0.8, - 0.6). In adults, higher AAMA was also associated with high consumption of fried potatoes whereas lower AAMA was associated with higher body-mass-index. Based on this large-scale study, several potential determinants of AA exposure were identified in children/adolescents and adults in European countries.
Collapse
Affiliation(s)
- Sandra F Fernández
- Foundation for the Promotion of Health and Biomedical Research in the Valencian Region, FISABIO-Public Health, Av. Catalunya, 21, 46020, Valencia, Spain
| | - Michael Poteser
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, Vienna, Austria
| | - Eva Govarts
- VITO Health, Flemish Institute for Technological Research (VITO), Mol, Belgium
| | - Olga Pardo
- Public Health Directorate of Valencia, Av. Catalunya, 21, 46020, Valencia, Spain
- Department of Analytical Chemistry, University of Valencia, Doctor Moliner 50, 46100, Burjassot, Spain
| | - Clara Coscollà
- Foundation for the Promotion of Health and Biomedical Research in the Valencian Region, FISABIO-Public Health, Av. Catalunya, 21, 46020, Valencia, Spain
| | - Thomas Schettgen
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Pauwelsstrasse 30, 52074, Aachen, Germany
| | - Nina Vogel
- German Environment Agency (UBA), Dessau-Roßlau, Berlin, Germany
| | - Till Weber
- German Environment Agency (UBA), Dessau-Roßlau, Berlin, Germany
| | - Aline Murawski
- German Environment Agency (UBA), Dessau-Roßlau, Berlin, Germany
| | | | - Maria Rüther
- German Environment Agency (UBA), Dessau-Roßlau, Berlin, Germany
| | | | - Sónia Namorado
- Department of Epidemiology, National Institute of Health Doutor Ricardo Jorge, Lisbon, Portugal
- Comprehensive Health Research Center, Universidade NOVA de Lisboa, Lisbon, Portugal
- Public Health Research Centre, NOVA National School of Public Health, Universidade NOVA de Lisboa, Lisbon, Portugal
| | | | - Brice Appenzeller
- Human Biomonitoring Research Unit, Department of Precision Health, Luxembourg Institute of Health (LIH), 1 A-B, Rue Thomas Edison, 1445, Strassen, Luxembourg
| | - Kristín Ólafsdóttir
- Department of Pharmacology and Toxicology, University of Iceland, Reykjavík, Iceland
| | - Thorhallur I Halldorsson
- Faculty of Food Science and Nutrition, School of Health Sciences, University of Iceland, Reykjavík, Iceland
| | - Line S Haug
- Norwegian Institute of Public Health, Lovisenberggata 8, 0456, Oslo, Norway
| | - Cathrine Thomsen
- Norwegian Institute of Public Health, Lovisenberggata 8, 0456, Oslo, Norway
| | - Fabio Barbone
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Ospedale di Cattinara, Strada di Fiume 447, 34149, Trieste, Italy
| | - Marika Mariuz
- Central Directorate for Health, Social Policies and Disability, Friuli Venezia Giulia Region, Riva Nazario Sauro, 8, 34124, Trieste, Italy
| | - Valentina Rosolen
- Central Directorate for Health, Social Policies and Disability, Friuli Venezia Giulia Region, Riva Nazario Sauro, 8, 34124, Trieste, Italy
| | - Loïc Rambaud
- Santé Publique France, SpFrance, 12, Rue du Val d'Osne, 94415, Saint-Maurice, France
| | - Margaux Riou
- Santé Publique France, SpFrance, 12, Rue du Val d'Osne, 94415, Saint-Maurice, France
| | - Thomas Göen
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 9-11, 91054, Erlangen, Germany
| | - Stefanie Nübler
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 9-11, 91054, Erlangen, Germany
| | - Moritz Schäfer
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 9-11, 91054, Erlangen, Germany
| | - Karin H A Zarrabi
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 9-11, 91054, Erlangen, Germany
| | | | | | - Greet Schoeters
- VITO Health, Flemish Institute for Technological Research (VITO), Mol, Belgium
- Department of Biomedical Sciences, University of Antwerp, 2610, Antwerp, Belgium
| | - Liese Gilles
- VITO Health, Flemish Institute for Technological Research (VITO), Mol, Belgium
| | - Karin Leander
- Unit of Cardiovascular and Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Nobels Väg 13, Box 210, 17177, Stockholm, Sweden
| | - Hanns Moshammer
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, Vienna, Austria
| | - Agneta Akesson
- Unit of Cardiovascular and Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Nobels Väg 13, Box 210, 17177, Stockholm, Sweden
| | - Federica Laguzzi
- Unit of Cardiovascular and Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Nobels Väg 13, Box 210, 17177, Stockholm, Sweden.
| |
Collapse
|
3
|
Poteser M, Laguzzi F, Schettgen T, Vogel N, Weber T, Zimmermann P, Hahn D, Kolossa-Gehring M, Namorado S, Van Nieuwenhuyse A, Appenzeller B, Halldórsson TI, Eiríksdóttir Á, Haug LS, Thomsen C, Barbone F, Rosolen V, Rambaud L, Riou M, Göen T, Nübler S, Schäfer M, Haji Abbas Zarrabi K, Gilles L, Martin LR, Schoeters G, Sepai O, Govarts E, Moshammer H. Time Trends of Acrylamide Exposure in Europe: Combined Analysis of Published Reports and Current HBM4EU Studies. Toxics 2022; 10:481. [PMID: 36006160 PMCID: PMC9415789 DOI: 10.3390/toxics10080481] [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] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 08/06/2022] [Accepted: 08/13/2022] [Indexed: 06/15/2023]
Abstract
More than 20 years ago, acrylamide was added to the list of potential carcinogens found in many common dietary products and tobacco smoke. Consequently, human biomonitoring studies investigating exposure to acrylamide in the form of adducts in blood and metabolites in urine have been performed to obtain data on the actual burden in different populations of the world and in Europe. Recognizing the related health risk, the European Commission responded with measures to curb the acrylamide content in food products. In 2017, a trans-European human biomonitoring project (HBM4EU) was started with the aim to investigate exposure to several chemicals, including acrylamide. Here we set out to provide a combined analysis of previous and current European acrylamide biomonitoring study results by harmonizing and integrating different data sources, including HBM4EU aligned studies, with the aim to resolve overall and current time trends of acrylamide exposure in Europe. Data from 10 European countries were included in the analysis, comprising more than 5500 individual samples (3214 children and teenagers, 2293 adults). We utilized linear models as well as a non-linear fit and breakpoint analysis to investigate trends in temporal acrylamide exposure as well as descriptive statistics and statistical tests to validate findings. Our results indicate an overall increase in acrylamide exposure between the years 2001 and 2017. Studies with samples collected after 2018 focusing on adults do not indicate increasing exposure but show declining values. Regional differences appear to affect absolute values, but not the overall time-trend of exposure. As benchmark levels for acrylamide content in food have been adopted in Europe in 2018, our results may imply the effects of these measures, but only indicated for adults, as corresponding data are still missing for children.
Collapse
Affiliation(s)
- Michael Poteser
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, 1090 Vienna, Austria
| | - Federica Laguzzi
- Unit of Cardiovascular and Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institute, Nobels väg 13, Box 210, 17177 Stockholm, Sweden
| | - Thomas Schettgen
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Pauwelsstrasse 30, D-52074 Aachen, Germany
| | - Nina Vogel
- German Environment Agency (UBA), D-14195 Berlin, Germany
| | - Till Weber
- German Environment Agency (UBA), D-14195 Berlin, Germany
| | | | - Domenica Hahn
- German Environment Agency (UBA), D-14195 Berlin, Germany
| | | | - Sónia Namorado
- Department of Epidemiology, National Institute of Health Dr. Ricardo Jorge, 1649-016 Lisbon, Portugal
| | | | - Brice Appenzeller
- Department of Precision Health, Luxembourg Institute of Health (LIH), L-4354 Luxembourg, Luxembourg
| | - Thórhallur I. Halldórsson
- Faculty of Food Science and Nutrition, School of Health Sciences, University of Iceland, 102 Reykjavik, Iceland
| | - Ása Eiríksdóttir
- Department of Pharmacology and Toxicology, University of Iceland, 107 Reykjavik, Iceland
| | - Line Småstuen Haug
- Norwegian Institute of Public Health, Lovisenberggata 8, 0456 Oslo, Norway
| | - Cathrine Thomsen
- Norwegian Institute of Public Health, Lovisenberggata 8, 0456 Oslo, Norway
| | - Fabio Barbone
- Department of Medical Area, DAME, University of Udine, 33100 Udine, Italy
| | - Valentina Rosolen
- Institute for Maternal and Child Health-IRCCS “Burlo Garofolo”, 34137 Trieste, Italy
| | - Loïc Rambaud
- Santé Publique France, French Public Health Agency (ANSP), 94415 Saint-Maurice, France
| | - Margaux Riou
- Santé Publique France, French Public Health Agency (ANSP), 94415 Saint-Maurice, France
| | - Thomas Göen
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander Universität Erlangen-Nürnberg, Henkestraße 9-11, D-91054 Erlangen, Germany
| | - Stefanie Nübler
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander Universität Erlangen-Nürnberg, Henkestraße 9-11, D-91054 Erlangen, Germany
| | - Moritz Schäfer
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander Universität Erlangen-Nürnberg, Henkestraße 9-11, D-91054 Erlangen, Germany
| | - Karin Haji Abbas Zarrabi
- Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander Universität Erlangen-Nürnberg, Henkestraße 9-11, D-91054 Erlangen, Germany
| | - Liese Gilles
- VITO Health, Flemish Institute for Technological Research (VITO), 2400 Mol, Belgium
| | | | - Greet Schoeters
- VITO Health, Flemish Institute for Technological Research (VITO), 2400 Mol, Belgium
| | | | - Eva Govarts
- VITO Health, Flemish Institute for Technological Research (VITO), 2400 Mol, Belgium
| | - Hanns Moshammer
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, 1090 Vienna, Austria
- Department of Hygiene, Medical University of Karakalpakstan, Nukus 230100, Uzbekistan
| |
Collapse
|
4
|
Moshammer H, Poteser M, Hutter HP. Correction to: COVID-19 and air pollution in Vienna-a time series approach. Wien Klin Wochenschr 2021; 133:991. [PMID: 34142245 PMCID: PMC8210973 DOI: 10.1007/s00508-021-01901-3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Hanns Moshammer
- Department of Environmental Health, Center for Public Health, Medical University Vienna, Kinderspitalgasse 15, 1090 Vienna, Austria
- Department of Hygiene, Medical University of Karakalpakstan, 230100 Nukus, Uzbekistan
| | - Michael Poteser
- Department of Environmental Health, Center for Public Health, Medical University Vienna, Kinderspitalgasse 15, 1090 Vienna, Austria
| | - Hans-Peter Hutter
- Department of Environmental Health, Center for Public Health, Medical University Vienna, Kinderspitalgasse 15, 1090 Vienna, Austria
| |
Collapse
|
5
|
Schmidt R, Nachtnebel M, Dienstleder M, Mertschnigg S, Schroettner H, Zankel A, Poteser M, Hutter HP, Eppel W, Fitzek H. Correlative SEM-Raman microscopy to reveal nanoplastics in complex environments. Micron 2021; 144:103034. [PMID: 33621743 DOI: 10.1016/j.micron.2021.103034] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 12/09/2020] [Revised: 02/11/2021] [Accepted: 02/11/2021] [Indexed: 11/19/2022]
Abstract
Nowadays "microplastics" (MPs) is an already well-known term and results of micro-sized particles found in consumer products or environments are regularly reported. However, studies of native MPs smaller than 1 μm, often referred to as nanoplastics (NPs), in analytically challenging environments are rare. In this study, a correlative approach between scanning electron microscopy and Raman microscopy is tested to meet the challenges of finding and identifying NPs in the 100 nm range in various environments, ranging from ideal (distilled water) to challenging (sea salt, human amniotic fluid). To test the viability of this approach in principle, standardized polystyrene beads (Ø 200 nm) are mixed into the various environments in different concentrations. Promising detection limits of 2 10-3 μg/L (distilled water), 20 μg/L (sea salt) and 200 μg/L (human amniotic fluid) are found. To test the approach in practices both sea salt and amniotic fluid are analysed for native NPs as well. Interestingly a nylon-NP was found in the amniotic fluid, maybe originating from the sampling device. However, the practical test reveals limitations, especially with regard to the reliable identification of unknown NPs by Raman microscopy, due to strong background signals from the environments. We conclude from this in combination with the excellent performance in distilled water that a combination of this approach with an advanced sample preparation technique would yield a powerful tool for the analysis of NPs in various environments.
Collapse
Affiliation(s)
- Ruth Schmidt
- Institute of Electron Microscopy and Nanoanalysis, NAWI Graz, Graz University of Technology, Steyrergasse 17, Austria; Graz Centre for Electron Microscopy, Steyrergasse 17, Austria.
| | | | | | - Sabrina Mertschnigg
- Institute of Electron Microscopy and Nanoanalysis, NAWI Graz, Graz University of Technology, Steyrergasse 17, Austria; Graz Centre for Electron Microscopy, Steyrergasse 17, Austria.
| | - Hartmuth Schroettner
- Institute of Electron Microscopy and Nanoanalysis, NAWI Graz, Graz University of Technology, Steyrergasse 17, Austria; Graz Centre for Electron Microscopy, Steyrergasse 17, Austria.
| | - Armin Zankel
- Institute of Electron Microscopy and Nanoanalysis, NAWI Graz, Graz University of Technology, Steyrergasse 17, Austria; Graz Centre for Electron Microscopy, Steyrergasse 17, Austria.
| | - Michael Poteser
- Centre for Public Health, Medical University Vienna, Abteilung für Umwelthygiene Und Umweltmedizin, Kinderspitalgasse 15, 1090, Wien, Austria.
| | - Hans-Peter Hutter
- Centre for Public Health, Medical University Vienna, Abteilung für Umwelthygiene Und Umweltmedizin, Kinderspitalgasse 15, 1090, Wien, Austria.
| | - Wolfgang Eppel
- Department of Obstetrics and Gynecology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria.
| | - Harald Fitzek
- Graz Centre for Electron Microscopy, Steyrergasse 17, Austria.
| |
Collapse
|
6
|
Hutter HP, Poteser M, Lemmerer K, Wallner P, Kundi M, Moshammer H, Weitensfelder L. Health Symptoms Related to Pesticide Use in Farmers and Laborers of Ecological and Conventional Banana Plantations in Ecuador. Int J Environ Res Public Health 2021; 18:ijerph18031126. [PMID: 33514015 PMCID: PMC7908553 DOI: 10.3390/ijerph18031126] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 01/22/2021] [Accepted: 01/24/2021] [Indexed: 01/09/2023]
Abstract
Conventional banana farming is pesticide-intensive and leads to high exposure of farmworkers. Ecuador is the world’s biggest exporter of bananas. In this field study in 5 communities in Ecuador, we recorded potentially pesticide-associated subjective health symptoms in farmworkers and compared pesticide users to workers in organic farming. With one exception, symptom rates were always higher in the pesticide-exposed group. Significance was reached in 8 out of 19 investigated symptoms with the highest odds ratios (and smallest p-values) for local irritation like skin and eye irritation (OR = 3.58, CI 1.10–11.71, and 4.10, CI 1.37–12.31, respectively) as well as systemic symptoms like dizziness (OR = 4.80, CI 1.55–14.87) and fatigue (OR = 4.96, CI 1.65–14.88). Moreover, gastrointestinal symptoms were reported more frequently by pesticide users: nausea (OR = 7.5, CI 1.77–31.77) and diarrhea (OR = 6.43, CI 1.06–30.00). The majority of farmworkers were not adequately protected from pesticide exposure. For example, only 3 of 31 farmworkers that had used pesticides recently reported using gloves and only 6 reported using masks during active spraying. Improved safety measures and a reduction in pesticide use are necessary to protect the health of banana farmworkers.
Collapse
Affiliation(s)
- Hans-Peter Hutter
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria; (H.-P.H.); (M.P.); (K.L.); (P.W.); (M.K.); (L.W.)
| | - Michael Poteser
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria; (H.-P.H.); (M.P.); (K.L.); (P.W.); (M.K.); (L.W.)
| | - Kathrin Lemmerer
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria; (H.-P.H.); (M.P.); (K.L.); (P.W.); (M.K.); (L.W.)
| | - Peter Wallner
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria; (H.-P.H.); (M.P.); (K.L.); (P.W.); (M.K.); (L.W.)
| | - Michael Kundi
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria; (H.-P.H.); (M.P.); (K.L.); (P.W.); (M.K.); (L.W.)
| | - Hanns Moshammer
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria; (H.-P.H.); (M.P.); (K.L.); (P.W.); (M.K.); (L.W.)
- Department of Hygiene, Medical University of Karakalpakstan, Nukus 230100, Uzbekistan
- Correspondence: ; Tel.: +43-1-401-603-4935
| | - Lisbeth Weitensfelder
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria; (H.-P.H.); (M.P.); (K.L.); (P.W.); (M.K.); (L.W.)
| |
Collapse
|
7
|
Hutter HP, Poteser M, Moshammer H, Lemmerer K, Mayer M, Weitensfelder L, Wallner P, Kundi M. Air Pollution Is Associated with COVID-19 Incidence and Mortality in Vienna, Austria. Int J Environ Res Public Health 2020; 17:E9275. [PMID: 33322456 PMCID: PMC7764269 DOI: 10.3390/ijerph17249275] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 12/01/2020] [Accepted: 12/09/2020] [Indexed: 12/23/2022]
Abstract
We determined the impact of air pollution on COVID-19-related mortality and reported-case incidence, analyzing the correlation of infection case numbers and outcomes with previous-year air pollution data from the populations of 23 Viennese districts. Time at risk started in a district when the first COVID-19 case was diagnosed. High exposure levels were defined as living in a district with an average (year 2019) concentration of nitrogen dioxide (NO2) and/or particulate matter (PM10) higher than the upper quartile (30 and 20 µg/m3, respectively) of all districts. The total population of the individual districts was followed until diagnosis of or death from COVID-19, or until 21 April 2020, whichever came first. Cox proportional hazard regression was performed after controlling for percentage of population aged 65 and more, percentage of foreigners and of persons with a university degree, unemployment rate, and population density. PM10 and NO2 were significantly and positively associated with the risk of a COVID-19 diagnosis (hazard ratio (HR) = 1.44 and 1.16, respectively). NO2 was also significantly associated with death from COVID-19 (HR = 1.72). Even within a single city, higher levels of air pollution are associated with an adverse impact on COVID-19 risk.
Collapse
Affiliation(s)
- Hans-Peter Hutter
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, 1090 Vienna, Austria; (H.-P.H.); (H.M.); (K.L.); (L.W.); (P.W.); (M.K.)
| | - Michael Poteser
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, 1090 Vienna, Austria; (H.-P.H.); (H.M.); (K.L.); (L.W.); (P.W.); (M.K.)
| | - Hanns Moshammer
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, 1090 Vienna, Austria; (H.-P.H.); (H.M.); (K.L.); (L.W.); (P.W.); (M.K.)
- Department of Hygiene, Medical University of Karakalpakstan, Nukus 230100, Uzbekistan
| | - Kathrin Lemmerer
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, 1090 Vienna, Austria; (H.-P.H.); (H.M.); (K.L.); (L.W.); (P.W.); (M.K.)
| | - Monika Mayer
- Institute of Meteorology and Climatology, University of Natural Resources and Life Sciences Vienna, 1180 Vienna, Austria;
| | - Lisbeth Weitensfelder
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, 1090 Vienna, Austria; (H.-P.H.); (H.M.); (K.L.); (L.W.); (P.W.); (M.K.)
| | - Peter Wallner
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, 1090 Vienna, Austria; (H.-P.H.); (H.M.); (K.L.); (L.W.); (P.W.); (M.K.)
| | - Michael Kundi
- Center for Public Health, Department of Environmental Health, Medical University of Vienna, 1090 Vienna, Austria; (H.-P.H.); (H.M.); (K.L.); (L.W.); (P.W.); (M.K.)
| |
Collapse
|
8
|
Moshammer H, Poteser M, Kundi M, Lemmerer K, Weitensfelder L, Wallner P, Hutter HP. Nitrogen-Dioxide Remains a Valid Air Quality Indicator. Int J Environ Res Public Health 2020; 17:ijerph17103733. [PMID: 32466201 PMCID: PMC7277805 DOI: 10.3390/ijerph17103733] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 05/15/2020] [Accepted: 05/21/2020] [Indexed: 01/08/2023]
Abstract
In epidemiological studies, both spatial and temporal variations in nitrogen dioxide (NO2) are a robust predictor of health risks. Compared to particulate matter, the experimental evidence for harmful effects at typical ambient concentrations is less extensive and not as clear for NO2. In the wake of the “Diesel emission scandal—Dieselgate”, the scientific basis of current limit values for ambient NO2 concentrations was attacked by industry lobbyists. It was argued that associations between NO2 levels and medical endpoints were not causal, as NO2 in older studies served as a proxy for aggressive particulate matter from incineration processes. With the introduction of particle filters in diesel cars, NO2 would have lost its meaning as a health indicator. Austria has a high percentage of diesel-powered cars (56%). If, indeed, associations between NO2 concentrations and health risks in previous studies were only due to older engines without a particle filter, we should expect a reduction in effect estimates over time as an increasing number of diesel cars on the roads were outfitted with particle filters. In previous time series studies from Vienna over shorter time intervals, we have demonstrated distributed lag effects over days up to two weeks and previous day effects of NO2 on total mortality. In a simplified model, we now assess the effect estimates for moving 5-year periods from the beginning of NO2 monitoring in Vienna (1987) until the year 2018 of same and previous day NO2 on total daily mortality. Contrary to industry claims of a spurious, no longer valid indicator function of NO2, effect estimates remained fairly stable, indicating an increase in total mortality of previous day NO2 by 0.52% (95% CI: 0.35–0.7%) per 10 µg/m3 change in NO2 concentration.
Collapse
Affiliation(s)
- Hanns Moshammer
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (M.P.); (M.K.); (K.L.); (P.W.); (L.W.); (H.-P.H.)
- Department of Hygiene, Medical University of Karakalpakstan, Uzbekistan, Nukus 230100, Uzbekistan
- Correspondence: ; Tel.: +43-1-40160-34935
| | - Michael Poteser
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (M.P.); (M.K.); (K.L.); (P.W.); (L.W.); (H.-P.H.)
| | - Michael Kundi
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (M.P.); (M.K.); (K.L.); (P.W.); (L.W.); (H.-P.H.)
| | - Kathrin Lemmerer
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (M.P.); (M.K.); (K.L.); (P.W.); (L.W.); (H.-P.H.)
| | - Lisbeth Weitensfelder
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (M.P.); (M.K.); (K.L.); (P.W.); (L.W.); (H.-P.H.)
| | - Peter Wallner
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (M.P.); (M.K.); (K.L.); (P.W.); (L.W.); (H.-P.H.)
| | - Hans-Peter Hutter
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (M.P.); (M.K.); (K.L.); (P.W.); (L.W.); (H.-P.H.)
| |
Collapse
|
9
|
Moshammer H, Khan AW, Wallner P, Poteser M, Kundi M, Hutter HP. Validity of reported indicators of pesticide exposure and relevance for cytotoxic and genotoxic effects on buccal cells. Mutagenesis 2020; 34:147-152. [PMID: 30590686 DOI: 10.1093/mutage/gey043] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 12/10/2018] [Indexed: 11/13/2022] Open
Abstract
Higher rates of nuclear anomalies in buccal cells of coffee workers exposed to pesticides in comparison to their unexposed peers were detected in our field study. Here, we extend our findings by examining other exposure indicators in this sample. Occupational exposure of 38 exposed and 33 non-exposed farmworkers was assessed as exposure days in the last month (0-25 days) and as years of exposure (0-47 years). Genotoxic and cytotoxic markers in buccal cells were analysed following standard procedures for buccal micronucleus cytome assay. Both exposure markers were associated with a higher frequency of nuclear anomalies with odds ratios more than 1. After restricting the analysis to the exposed workers only, this association remained only with the marker of recent exposure. In a secondary analysis also environmental exposure defined as proximity of the home to the nearest sprayed field (distance <1000 m) was assessed. Proximity led to increased rates (with odds ratios more than 3) of genotoxic but not cytotoxic nuclear anomalies. Reported recent frequency and intensity of pesticide use and application are a valid exposure marker relevant for cytological pathologies in the buccal mucosa. The exposure metric for environmental exposure was rather crude and confounding by some unmeasured factor cannot be fully excluded. Nevertheless, simple exposure indicators that can even be obtained under rather difficult field conditions do provide health-relevant and valid information.
Collapse
Affiliation(s)
- Hanns Moshammer
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, Kinderspitalgasse, Vienna, Austria
| | - Abdul Wali Khan
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, Kinderspitalgasse, Vienna, Austria.,Federal Govt. Polyclinic (PGMI), Islamabad, Pakistan
| | - Peter Wallner
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, Kinderspitalgasse, Vienna, Austria.,International Society of Doctors for the Environment Austria, Große Mohrengasse, Vienna, Austria
| | - Michael Poteser
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, Kinderspitalgasse, Vienna, Austria
| | - Michael Kundi
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, Kinderspitalgasse, Vienna, Austria
| | - Hans-Peter Hutter
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, Kinderspitalgasse, Vienna, Austria.,International Society of Doctors for the Environment Austria, Große Mohrengasse, Vienna, Austria
| |
Collapse
|
10
|
Moshammer H, Poteser M, Lemmerer K, Wallner P, Hutter HP. Time Course of COVID-19 Cases in Austria. Int J Environ Res Public Health 2020; 17:E3270. [PMID: 32392880 PMCID: PMC7246438 DOI: 10.3390/ijerph17093270] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/05/2020] [Accepted: 05/06/2020] [Indexed: 12/19/2022]
Abstract
COVID-19 is an infectious disease caused by a novel coronavirus, which first appeared in China in late 2019, and reached pandemic distribution in early 2020. The first major outbreak in Europe occurred in Northern Italy where it spread to neighboring countries, notably to Austria, where skiing resorts served as a main transmission hub. Soon, the Austrian government introduced strict measures to curb the spread of the virus. Using publicly available data, we assessed the efficiency of the governmental measures. We assumed an average incubation period of one week and an average duration of infectivity of 10 days. One week after the introduction of strict measures, the increase in daily new cases was reversed, and the reproduction number dropped. The crude estimates tended to overestimate the reproduction rate in the early phase. Publicly available data provide a first estimate about the effectiveness of public health measures. However, more data are needed for an unbiased assessment.
Collapse
Affiliation(s)
- Hanns Moshammer
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (H.M.); (K.L.); (P.W.); (H.-P.H.)
- Karakalpak Medical University, Department of Hygiene, Nukus 230100, Uzbekistan
| | - Michael Poteser
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (H.M.); (K.L.); (P.W.); (H.-P.H.)
| | - Kathrin Lemmerer
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (H.M.); (K.L.); (P.W.); (H.-P.H.)
| | - Peter Wallner
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (H.M.); (K.L.); (P.W.); (H.-P.H.)
- International Society of Doctors for the Environment Austria, 1020 Vienna, Austria
| | - Hans-Peter Hutter
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Vienna, Austria; (H.M.); (K.L.); (P.W.); (H.-P.H.)
- International Society of Doctors for the Environment Austria, 1020 Vienna, Austria
| |
Collapse
|
11
|
Poteser M, Moshammer H. Daylight Saving Time Transitions: Impact on Total Mortality. Int J Environ Res Public Health 2020; 17:ijerph17051611. [PMID: 32131514 PMCID: PMC7084938 DOI: 10.3390/ijerph17051611] [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] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 02/28/2020] [Accepted: 02/29/2020] [Indexed: 11/16/2022]
Abstract
In Europe and many countries worldwide, a half-yearly changing time scheme has been adopted with the aim of optimizing the use of natural daylight during working hours and saving energy. Because the expected net economic benefit was not achieved, the discussion about the optimal solution has been reopened with a shifted focus on social and health related consequences. We set out to produce evidence for this discussion and analysed the impact of daylight saving time on total mortality of a general population in a time series study on daily total mortality for the years 1970–2018 in the city of Vienna, Austria. Daily deaths were modelled by Poisson regression controlling for seasonal and long-term trend, same-day and 14-day average temperature, humidity, and day of week. During the week after the spring transition a significant increase in daily total mortality of about 3% per day was observed. This was not the case during the week after the fall transition. The increase in daily mortality as observed in the week after spring DST-transition is most likely causally linked to the change in time scheme.
Collapse
Affiliation(s)
- Michael Poteser
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, Kinderspitalgasse 15, 1090 Vienna, Austria;
| | - Hanns Moshammer
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, Kinderspitalgasse 15, 1090 Vienna, Austria;
- Nukus Branch of Tashkent Pediatric Medical Institute, Department of Hygiene, Nukus 230100, Uzbekistan
- Correspondence: ; Tel.: +43-1-40160-34935
| |
Collapse
|
12
|
Hutter HP, Poteser M, Lemmerer K, Wallner P, Shahraki Sanavi S, Kundi M, Moshammer H, Weitensfelder L. Indicators of Genotoxicity in Farmers and Laborers of Ecological and Conventional Banana Plantations in Ecuador. Int J Environ Res Public Health 2020; 17:ijerph17041435. [PMID: 32102275 PMCID: PMC7068563 DOI: 10.3390/ijerph17041435] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 02/19/2020] [Accepted: 02/20/2020] [Indexed: 02/02/2023]
Abstract
Banana farming represents an important segment of agricultural production in Ecuador. The health of farmworkers might be compromised by the extensive use of pesticides in plantations applied under poorly regulated conditions. Due to an increased awareness of pesticide-related problems for nature, as well as for worker and consumer health, ecological farming has been established in some plantations of Ecuador. We set out to investigate the occupational health of workers in both conventional and ecological farming. Nuclear anomalies in buccal epithelial cells were used as short-term indicators for genotoxicity and a potentially increased cancer risk in the two groups of farmworkers. By application of the Buccal Micronucleus Cytome Assay (BMCA), we found the frequency of micronuclei in conventional pesticide using farmworkers significantly increased by 2.6-fold, and other nuclear anomalies significantly increased by 24% to 80% (except pyknosis with a non-significant increase of 11%) compared to the farmworkers on ecological plantations. These results demonstrate that ecological farming may provide an alternative to extensive pesticide use with significantly reduced indicators of cancer risk. In conventional farming, improvements in education and instruction regarding the safe handling of pesticides and protective equipment, as well as regulatory measures, are urgently needed.
Collapse
|
13
|
Hutter HP, Kundi M, Lemmerer K, Poteser M, Weitensfelder L, Wallner P, Moshammer H. Subjective Symptoms of Male Workers Linked to Occupational Pesticide Exposure on Coffee Plantations in the Jarabacoa Region, Dominican Republic. Int J Environ Res Public Health 2018; 15:E2099. [PMID: 30257443 PMCID: PMC6209871 DOI: 10.3390/ijerph15102099] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 09/19/2018] [Accepted: 09/22/2018] [Indexed: 01/09/2023]
Abstract
Acute and sub-acute effects of pesticide use in coffee farmers have rarely been investigated. In the present field study, self-reported health symptoms from 38 male pesticide users were compared to those of 33 organic farmers. Results of cytological findings have been reported in an accompanying paper in this issue. The present second part of the study comprises a questionnaire based survey for various, potentially pesticide related symptoms among the coffee farmers. Symptom rates were generally higher in exposed workers, reaching significance in nine out of 19 assessed symptoms. Significantly increased symptom frequencies were related to neurotoxicity, parasympathic effects and acetylcholine esterase inhibition, with the highest differences found for excessive salivation, dizziness and stomach ache. We revealed a lack of precautionary measures in the majority of farmers. Better education, regulations, and safety equipment are urgently needed.
Collapse
Affiliation(s)
- Hans-Peter Hutter
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria.
| | - Michael Kundi
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria.
| | - Kathrin Lemmerer
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria.
| | - Michael Poteser
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria.
| | - Lisbeth Weitensfelder
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria.
| | - Peter Wallner
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria.
| | - Hanns Moshammer
- Department of Environmental Health, Center for Public Health, Medical University Vienna, 1090 Wien, Austria.
| |
Collapse
|
14
|
Moshammer H, Poteser M. Comment on Zheng et al. Association between Promoter Methylation of Gene ERCC3 and Benzene Hematotoxicity. Int. J. Environ. Res. Public Health 2017, 14, 921. Int J Environ Res Public Health 2017; 14:E1393. [PMID: 29144381 PMCID: PMC5708032 DOI: 10.3390/ijerph14111393] [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] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 11/10/2017] [Accepted: 11/10/2017] [Indexed: 11/23/2022]
Abstract
Benzene is an established carcinogenic substance [1,2].[...].
Collapse
Affiliation(s)
- Hanns Moshammer
- Department of Environmental Health, Medical University of Vienna, ZPH, Kinderspitalgasse 15, 1090 Vienna, Austria.
| | - Michael Poteser
- Department of Environmental Health, Medical University of Vienna, ZPH, Kinderspitalgasse 15, 1090 Vienna, Austria.
| |
Collapse
|
15
|
Abstract
AbstractAn analysis of biological effects induced by environmental toxins and exposure-related evaluation of potential risks for health and environment represent central tasks in classical biomonitoring. While epidemiological data and population surveys are clearly the methodological frontline of this scientific field, cellbased in vitro assays provide information on toxin-affected cellular pathways and mechanisms, and are important sources for the identification of relevant biomarkers. This review provides an overview on currently available in vitro methods based on cultured cells, as well as some limitations and considerations that are of specific interest in the context of environmental toxicology. Today, a large number of different endpoints can be determined to pinpoint basal and specific toxicological cellular effects. Technological progress and increasingly refined protocols are extending the possibilities of cell-based in vitro assays in environmental toxicology and promoting their increasingly important role in biomonitoring.
Collapse
|
16
|
Poteser M, Leitinger G, Pritz E, Platzer D, Frischauf I, Romanin C, Groschner K. Live-cell imaging of ER-PM contact architecture by a novel TIRFM approach reveals extension of junctions in response to store-operated Ca 2+-entry. Sci Rep 2016; 6:35656. [PMID: 27759093 PMCID: PMC5069484 DOI: 10.1038/srep35656] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [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: 07/05/2016] [Accepted: 09/29/2016] [Indexed: 01/16/2023] Open
Abstract
Nanometer-spaced appositions between endoplasmic reticulum and plasma membrane (ER-PM junctions) stabilized by membrane-joining protein complexes are critically involved in cellular Ca2+-handling and lipid trafficking. ER-PM junctional architecture and plasticity associated with inter-membrane communication are as yet barely understood. Here, we introduce a method to precisely characterize ER-PM junction morphology and dynamics with high temporal resolution and minimal disturbance of junctional intermembrane communication. We show that expression of soluble cytosolic fluorophores in combination with TIRFM enables to delineate ER and PM distance in the range of 10-150 nm. Live-cell imaging of sub-plasmalemmal structures in RBL-2H3 mast cells by this method, designated as fluorescence density mapping (FDM), revealed profound dynamics of ER-PM contact sites in response to store-depletion. We report the existence of a Ca2+-dependent process that expands the junctional ER to enlarge its contact surface with the PM, thereby promoting and stabilizing STIM1-Orai1 competent ER-PM junctions.
Collapse
Affiliation(s)
- Michael Poteser
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21/4, 8010 Graz, Austria
| | - Gerd Leitinger
- Institute of Cell Biology, Histology and Embryology Research Unit "Electron Microscopic Techniques", Medical University of Graz, Harrachgasse 21/7, 8010 Graz, Austria
| | - Elisabeth Pritz
- Institute of Cell Biology, Histology and Embryology Research Unit "Electron Microscopic Techniques", Medical University of Graz, Harrachgasse 21/7, 8010 Graz, Austria
| | - Dieter Platzer
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21/4, 8010 Graz, Austria
| | - Irene Frischauf
- Institute of Biophysics, Johannes Kepler University of Linz, Austria, Gruberstrasse 40, 4020 Linz, Austria
| | - Christoph Romanin
- Institute of Biophysics, Johannes Kepler University of Linz, Austria, Gruberstrasse 40, 4020 Linz, Austria
| | - Klaus Groschner
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21/4, 8010 Graz, Austria
| |
Collapse
|
17
|
Derler I, Jardin I, Stathopulos PB, Muik M, Fahrner M, Zayats V, Pandey SK, Poteser M, Lackner B, Absolonova M, Schindl R, Groschner K, Ettrich R, Ikura M, Romanin C. Cholesterol modulates Orai1 channel function. Sci Signal 2016; 9:ra10. [PMID: 26814231 DOI: 10.1126/scisignal.aad7808] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
STIM1 (stromal interaction molecule 1) and Orai proteins are the essential components of Ca(2+) release-activated Ca(2+) (CRAC) channels. We focused on the role of cholesterol in the regulation of STIM1-mediated Orai1 currents. Chemically induced cholesterol depletion enhanced store-operated Ca(2+) entry (SOCE) and Orai1 currents. Furthermore, cholesterol depletion in mucosal-type mast cells augmented endogenous CRAC currents, which were associated with increased degranulation, a process that requires calcium influx. Single point mutations in the Orai1 amino terminus that would be expected to abolish cholesterol binding enhanced SOCE to a similar extent as did cholesterol depletion. The increase in Orai1 activity in cells expressing these cholesterol-binding-deficient mutants occurred without affecting the amount in the plasma membrane or the coupling of STIM1 to Orai1. We detected cholesterol binding to an Orai1 amino-terminal fragment in vitro and to full-length Orai1 in cells. Thus, our data showed that Orai1 senses the amount of cholesterol in the plasma membrane and that the interaction of Orai1 with cholesterol inhibits its activity, thereby limiting SOCE.
Collapse
Affiliation(s)
- Isabella Derler
- Institute of Biophysics, Johannes Kepler University of Linz, Gruberstrasse 40, 4020 Linz, Austria.
| | - Isaac Jardin
- Institute of Biophysics, Johannes Kepler University of Linz, Gruberstrasse 40, 4020 Linz, Austria
| | - Peter B Stathopulos
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario N6A 5C1, Canada
| | - Martin Muik
- Institute of Biophysics, Johannes Kepler University of Linz, Gruberstrasse 40, 4020 Linz, Austria
| | - Marc Fahrner
- Institute of Biophysics, Johannes Kepler University of Linz, Gruberstrasse 40, 4020 Linz, Austria
| | - Vasilina Zayats
- Center for Nanobiology and Structural Biology, Institute of Microbiology, Academy of Sciences of the Czech Republic, CZ-373 33 Nové Hrady, Czech Republic
| | - Saurabh K Pandey
- Center for Nanobiology and Structural Biology, Institute of Microbiology, Academy of Sciences of the Czech Republic, CZ-373 33 Nové Hrady, Czech Republic
| | - Michael Poteser
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21/4, 8010 Graz, Austria
| | - Barbara Lackner
- Institute of Biophysics, Johannes Kepler University of Linz, Gruberstrasse 40, 4020 Linz, Austria
| | - Marketa Absolonova
- Institute of Biophysics, Johannes Kepler University of Linz, Gruberstrasse 40, 4020 Linz, Austria
| | - Rainer Schindl
- Institute of Biophysics, Johannes Kepler University of Linz, Gruberstrasse 40, 4020 Linz, Austria
| | - Klaus Groschner
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21/4, 8010 Graz, Austria
| | - Rüdiger Ettrich
- Center for Nanobiology and Structural Biology, Institute of Microbiology, Academy of Sciences of the Czech Republic, CZ-373 33 Nové Hrady, Czech Republic
| | - Mitsu Ikura
- Princess Margaret Cancer Centre and Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Christoph Romanin
- Institute of Biophysics, Johannes Kepler University of Linz, Gruberstrasse 40, 4020 Linz, Austria.
| |
Collapse
|
18
|
Doleschal B, Primessnig U, Wölkart G, Wolf S, Schernthaner M, Lichtenegger M, Glasnov TN, Kappe CO, Mayer B, Antoons G, Heinzel F, Poteser M, Groschner K. TRPC3 contributes to regulation of cardiac contractility and arrhythmogenesis by dynamic interaction with NCX1. Cardiovasc Res 2015; 106:163-73. [PMID: 25631581 PMCID: PMC4362401 DOI: 10.1093/cvr/cvv022] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Aim TRPC3 is a non-selective cation channel, which forms a Ca2+ entry pathway involved in cardiac remodelling. Our aim was to analyse acute electrophysiological and contractile consequences of TRPC3 activation in the heart. Methods and results We used a murine model of cardiac TRPC3 overexpression and a novel TRPC3 agonist, GSK1702934A, to uncover (patho)physiological functions of TRPC3. GSK1702934A induced a transient, non-selective conductance and prolonged action potentials in TRPC3-overexpressing myocytes but lacked significant electrophysiological effects in wild-type myocytes. GSK1702934A transiently enhanced contractility and evoked arrhythmias in isolated Langendorff hearts from TRPC3-overexpressing but not wild-type mice. Interestingly, pro-arrhythmic effects outlasted TRPC3 current activation, were prevented by enhanced intracellular Ca2+ buffering, and suppressed by the NCX inhibitor 3′,4′-dichlorobenzamil hydrochloride. GSK1702934A substantially promoted NCX currents in TRPC3-overexpressing myocytes. The TRPC3-dependent electrophysiologic, pro-arrhythmic, and inotropic actions of GSK1702934A were mimicked by angiotensin II (AngII). Immunocytochemistry demonstrated colocalization of TRPC3 with NCX1 and disruption of local interaction upon channel activation by either GSK1702934A or AngII. Conclusion Cardiac TRPC3 mediates Ca2+ and Na+ entry in proximity of NCX1, thereby elevating cellular Ca2+ levels and contractility. Excessive activation of TRPC3 is associated with transient cellular Ca2+ overload, spatial uncoupling between TRPC3 and NCX1, and arrhythmogenesis. We propose TRPC3-NCX micro/nanodomain communication as determinant of cardiac contractility and susceptibility to arrhythmogenic stimuli.
Collapse
Affiliation(s)
| | - Uwe Primessnig
- Department of Cardiology, Medical University of Graz, Graz, Austria Ludwig Boltzmann Institute of Translational Heart Failure Research, Graz, Austria
| | - Gerald Wölkart
- Institute of Pharmaceutical Sciences, University of Graz, Graz, Austria
| | - Stefan Wolf
- Institute of Pharmaceutical Sciences, University of Graz, Graz, Austria
| | - Michaela Schernthaner
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21, Graz 8010, Austria
| | | | - Toma N Glasnov
- Institute of Chemistry, University of Graz, Graz, Austria Christian Doppler Laboratory for Continuous Flow Chemistry, Institute of Chemistry, University of Graz, Graz, Austria
| | - C Oliver Kappe
- Institute of Chemistry, University of Graz, Graz, Austria
| | - Bernd Mayer
- Institute of Pharmaceutical Sciences, University of Graz, Graz, Austria
| | - Gudrun Antoons
- Department of Cardiology, Medical University of Graz, Graz, Austria Ludwig Boltzmann Institute of Translational Heart Failure Research, Graz, Austria
| | - Frank Heinzel
- Department of Cardiology, Medical University of Graz, Graz, Austria Ludwig Boltzmann Institute of Translational Heart Failure Research, Graz, Austria
| | - Michael Poteser
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21, Graz 8010, Austria
| | - Klaus Groschner
- Ludwig Boltzmann Institute of Translational Heart Failure Research, Graz, Austria Institute of Biophysics, Medical University of Graz, Harrachgasse 21, Graz 8010, Austria
| |
Collapse
|
19
|
Lichtenegger M, Stockner T, Poteser M, Groschner K. Allosteric Coupling Between Gate and Selectivity Filter in TRPC3. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.1924] [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] Open
|
20
|
König S, Browne S, Doleschal B, Schernthaner M, Poteser M, Mächler H, Wittchow E, Braune M, Muik M, Romanin C, Groschner K. Inhibition of Orai1-mediated Ca(2+) entry is a key mechanism of the antiproliferative action of sirolimus in human arterial smooth muscle. Am J Physiol Heart Circ Physiol 2013; 305:H1646-57. [PMID: 24056904 DOI: 10.1152/ajpheart.00365.2013] [Citation(s) in RCA: 16] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Sirolimus (rapamycin) is used in drug-eluting stent strategies and proved clearly superior in this application compared with other immunomodulators such as pimecrolimus. The molecular basis of this action of sirolimus in the vascular system is still incompletely understood. Measurements of cell proliferation in human coronary artery smooth muscle cells (hCASM) demonstrated a higher antiproliferative activity of sirolimus compared with pimecrolimus. Although sirolimus lacks inhibitory effects on calcineurin, nuclear factor of activated T-cell activation in hCASM was suppressed to a similar extent by both drugs at 10 μM. Sirolimus, but not pimecrolimus, inhibited agonist-induced and store-operated Ca(2+) entry as well as cAMP response element binding protein (CREB) phosphorylation in human arterial smooth muscle, suggesting the existence of an as-yet unrecognized inhibitory effect of sirolimus on Ca(2+) signaling and Ca(2+)-dependent gene transcription. Electrophysiological experiments revealed that only sirolimus but not pimecrolimus significantly blocked the classical stromal interaction molecule/Orai-mediated, store-operated Ca(2+) current reconstituted in human embryonic kidney cells (HEK293). A link between Orai function and proliferation was confirmed by dominant-negative knockout of Orai in hCASM. Analysis of the effects of sirolimus on cell proliferation and CREB activation in an in vitro model of arterial intervention using human aorta corroborated the ability of sirolimus to suppress stent implantation-induced CREB activation in human arteries. We suggest inhibition of store-operated Ca(2+) entry based on Orai channels and the resulting suppression of Ca(2+) transcription coupling as a key mechanism underlying the antiproliferative activity of sirolimus in human arteries. This mechanism of action is specific for sirolimus and not a general feature of drugs interacting with FK506-binding proteins.
Collapse
Affiliation(s)
- Sarah König
- Institute of Biophysics, Medical University of Graz, Graz, Austria
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Lichtenegger M, Stockner T, Poteser M, Schleifer H, Platzer D, Romanin C, Groschner K. A novel homology model of TRPC3 reveals allosteric coupling between gate and selectivity filter. Cell Calcium 2013; 54:175-85. [PMID: 23800762 DOI: 10.1016/j.ceca.2013.05.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 05/27/2013] [Accepted: 05/30/2013] [Indexed: 01/09/2023]
Abstract
Utilizing a novel molecular model of TRPC3, based on the voltage-gated sodium channel from Arcobacter butzleri (Na(V)AB) as template, we performed structure-guided mutagenesis experiments to identify amino acid residues involved in divalent permeation and gating. Substituted cysteine accessibility screening within the predicted selectivity filter uncovered amino acids 629-631 as the narrowest part of the permeation pathway with an estimated pore diameter of < 5.8Å. E630 was found to govern not only divalent permeability but also sensitivity of the channel to block by ruthenium red. Mutations in a hydrophobic cluster at the cytosolic termini of transmembrane segment 6, corresponding to the S6 bundle crossing structure in Na(V)AB, distorted channel gating. Removal of a large hydrophobic residue (I667A or I667E) generated channels with approximately 60% constitutive activity, suggesting I667 as part of the dynamic structure occluding the permeation path. Destabilization of the gate was associated with reduced Ca2+ permeability, altered cysteine cross-linking in the selectivity filter and promoted channel block by ruthenium red. Collectively, we present a structural model of the TRPC3 permeation pathway and localize the channel's selectivity filter and the occluding gate. Moreover, we provide evidence for allosteric coupling between the gate and the selectivity filter in TRPC3.
Collapse
Affiliation(s)
- Michaela Lichtenegger
- Institute of Pharmaceutical Sciences--Pharmacology and Toxicology, University of Graz, A-8010 Graz, Austria
| | | | | | | | | | | | | |
Collapse
|
22
|
Bahnassy SA, Poteser M, Schleifer H, Romanin C, Groschner K. Stretch-Induced Activation of NFAT Signaling in Hl-1 Cardiomyocytes. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.2517] [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: 10/27/2022] Open
|
23
|
Doleschal B, Tieber K, Poteser M, Schleifer H, Frischauf I, Glasnov TN, Kappe CO, Romanin C, Groschner K. TRPC3 Expression Modulates Store-Operated Currents in RBL-2H3 Cells. Biophys J 2012. [DOI: 10.1016/j.bpj.2011.11.2918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
|
24
|
Schleifer H, Oppenrieder R, Stürmer S, Doleschal B, Poteser M, Glasnov TN, Kappe CO, Groschner K. Novel pyrazole inhibitors for discrimination between receptor-operated and store-operated Ca2+ entry. BMC Pharmacol 2011. [PMCID: PMC3194250 DOI: 10.1186/1471-2210-11-s2-a18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
25
|
Schernthaner M, Poteser M, Lichtenegger M, Schleifer H, Romanin C, Groschner K. Analysis of the Molecular Basis of Ca2+- dependent Regulation of TRPC3 Channels. Biophys J 2011. [DOI: 10.1016/j.bpj.2010.12.784] [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] Open
|
26
|
Lichtenegger M, Poteser M, Stockner T, Schleifer H, Romanin C, Groschner K. Engineering of the TRPC3 Selectivity Filter Identifies a Unique, Dual Signaling Function of TRPC3 in the Heart. Biophys J 2011. [DOI: 10.1016/j.bpj.2010.12.3039] [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] Open
|
27
|
Bondarenko A, Waldeck-Weiermair M, Naghdi S, Poteser M, Malli R, Graier WF. GPR55-dependent and -independent ion signalling in response to lysophosphatidylinositol in endothelial cells. Br J Pharmacol 2011; 161:308-20. [PMID: 20735417 PMCID: PMC2931756 DOI: 10.1111/j.1476-5381.2010.00744.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [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] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND AND PURPOSE The glycerol-based lysophospholipid lysophosphatidylinositol (LPI) is an endogenous agonist of the G-protein-coupled receptor 55 (GPR55) exhibiting cannabinoid receptor-like properties in endothelial cells. To estimate the contribution of GPR55 to the physiological effects of LPI, the GPR55-dependent and -independent electrical responses in this cell type were investigated. EXPERIMENTAL APPROACH Applying small interference RNA-mediated knock-down and transient overexpression, GPR55-dependent and -independent effects of LPI on cytosolic free Ca(2+) concentration, membrane potential and transmembrane ion currents were studied in EA.hy296 cells. KEY RESULTS In a GPR55-dependent, GDPbetaS and U73122-sensitive manner, LPI induced rapid and transient intracellular Ca(2+) release that was associated with activation of charybdotoxin-sensitive, large conductance, Ca(2+)-activated, K(+) channels (BK(Ca)) and temporary membrane hyperpolarization. Following these initial electrical reactions, LPI elicited GPR55-independent long-lasting Na(+) loading and a non-selective inward current causing sustained membrane depolarization that depended on extracellular Ca(2+) and Na(+) and was partially inhibited by Ni(2+) and La(3+). This inward current was due to the activation of a voltage-independent non-selective cation current. The Ni(2+) and La(3+)-insensitive depolarization with LPI was prevented by inhibition of the Na/K-ATPase by ouabain. CONCLUSIONS AND IMPLICATIONS LPI elicited a biphasic response in endothelial cells of which the immediate Ca(2+) signalling depends on GPR55 while the subsequent depolarization is due to Na(+) loading via non-selective cation channels and an inhibition of the Na/K-ATPase. Thus, LPI is a potent signalling molecule that affects endothelial functions by modulating several cellular electrical responses that are only partially linked to GPR55.
Collapse
Affiliation(s)
- Alexander Bondarenko
- Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, Graz, Austria
| | | | | | | | | | | |
Collapse
|
28
|
Lichtenegger M, Schleifer H, Stockner T, Romanin C, Poteser M, Groschner K. Molecular engineering of the TRPC3 pore structure identifies Ca2+ permeation through TRPC3 channels as a key determinant of cardiac calcineurin/NFAT signaling. BMC Pharmacol 2010. [PMCID: PMC3016524 DOI: 10.1186/1471-2210-10-s1-a15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
29
|
Naghdi S, Waldeck-Weiermair M, Fertschai I, Poteser M, Graier WF, Malli R. Mitochondrial Ca2+ uptake and not mitochondrial motility is required for STIM1-Orai1-dependent store-operated Ca2+ entry. J Cell Sci 2010; 123:2553-64. [DOI: 10.1242/jcs.070151] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Store-operated Ca2+ entry (SOCE) is established by formation of subplasmalemmal clusters of the endoplasmic reticulum (ER) protein, stromal interacting molecule 1 (STIM1) upon ER Ca2+ depletion. Thereby, STIM1 couples to plasma membrane channels such as Orai1. Thus, a close proximity of ER domains to the plasma membrane is a prerequisite for SOCE activation, challenging the concept of local Ca2+ buffering by mitochondria as being essential for SOCE. This study assesses the impact of mitochondrial Ca2+ handling and motility on STIM1–Orai1-dependent SOCE. High-resolution microscopy showed only 10% of subplasmalemmal STIM1 clusters to be colocalized with mitochondria. Impairments of mitochondrial Ca2+ handling by inhibition of mitochondrial Na+-Ca2+ exchanger (NCXmito) or depolarization only partially suppressed Ca2+ entry in cells overexpressing STIM1-Orai1. However, SOCE was completely abolished when both NCXmito was inhibited and the inner mitochondrial membrane was depolarized, in STIM1- and Orai1-overexpressing cells. Immobilization of mitochondria by expression of mAKAP-RFP-CAAX, a construct that physically links mitochondria to the plasma membrane, affected the Ca2+ handling of the organelles but not the activity of SOCE. Our observations indicate that mitochondrial Ca2+ uptake, including reversal of NCXmito, is fundamental for STIM1–Orai1-dependent SOCE, whereas the proximity of mitochondria to STIM1-Orai1 SOCE units and their motility is not required.
Collapse
Affiliation(s)
- Shamim Naghdi
- Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010 Graz, Austria
| | - Markus Waldeck-Weiermair
- Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010 Graz, Austria
| | - Ismene Fertschai
- Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010 Graz, Austria
| | - Michael Poteser
- Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010 Graz, Austria
| | - Wolfgang F. Graier
- Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010 Graz, Austria
| | - Roland Malli
- Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010 Graz, Austria
| |
Collapse
|
30
|
Schleifer H, Poteser M, Derler I, Kappe CO, Romanin C, Groschner K. Analysis of the Role of TRPC3 in Ca2+ Signaling of RBL-2H3 Mast Cells. Biophys J 2010. [DOI: 10.1016/j.bpj.2009.12.1862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
31
|
Graziani A, Poteser M, Heupel WM, Schleifer H, Krenn M, Drenckhahn D, Romanin C, Baumgartner W, Groschner K. Cell-cell contact formation governs Ca2+ signaling by TRPC4 in the vascular endothelium: evidence for a regulatory TRPC4-beta-catenin interaction. J Biol Chem 2009; 285:4213-4223. [PMID: 19996314 PMCID: PMC2823560 DOI: 10.1074/jbc.m109.060301] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [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] [Indexed: 02/03/2023] Open
Abstract
TRPC4 is well recognized as a prominent cation channel in the vascular endothelium, but its contribution to agonist-induced endothelial Ca2+ entry is still a matter of controversy. Here we report that the cellular targeting and Ca2+ signaling function of TRPC4 is determined by the state of cell-cell adhesions during endothelial phenotype transitions. TRPC4 surface expression in human microvascular endothelial cells (HMEC-1) increased with the formation of cell-cell contacts. Epidermal growth factor recruited TRPC4 into the plasma membrane of proliferating cells but initiated retrieval of TRPC4 from the plasma membrane in quiescent, barrier-forming cells. Epidermal growth factor-induced Ca2+ entry was strongly promoted by the formation of cell-cell contacts, and both siRNA and dominant negative knockdown experiments revealed that TRPC4 mediates stimulated Ca2+ entry exclusively in proliferating clusters that form immature cell-cell contacts. TRPC4 co-precipitated with the junctional proteins β-catenin and VE-cadherin. Analysis of cellular localization of fluorescent fusion proteins provided further evidence for recruitment of TRPC4 into junctional complexes. Analysis of TRPC4 function in the HEK293 expression system identified β-catenin as a signaling molecule that enables cell-cell contact-dependent promotion of TRPC4 function. Our results place TRPC4 as a Ca2+ entry channel that is regulated by cell-cell contact formation and interaction with β-catenin. TRPC4 is suggested to serve stimulated Ca2+ entry in a specific endothelial state during the transition from a proliferating to a quiescent phenotype. Thus, TRPC4 may adopt divergent, as yet unappreciated functions in endothelial Ca2+ homeostasis and emerges as a potential key player in endothelial phenotype switching and tuning of cellular growth factor signaling.
Collapse
Affiliation(s)
- Annarita Graziani
- From the Institute of Pharmaceutical Sciences-Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Michael Poteser
- From the Institute of Pharmaceutical Sciences-Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Wolfgang-Moritz Heupel
- the Institute of Anatomy and Cell Biology, University of Würzburg, Koellikerstrasse 6, 97070 Würzburg, Germany
| | - Hannes Schleifer
- From the Institute of Pharmaceutical Sciences-Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Martin Krenn
- From the Institute of Pharmaceutical Sciences-Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Detlev Drenckhahn
- the Institute of Anatomy and Cell Biology, University of Würzburg, Koellikerstrasse 6, 97070 Würzburg, Germany
| | - Christoph Romanin
- the Institute of Biophysics, University of Linz, A-4040 Linz, Austria, and
| | - Werner Baumgartner
- the Department of Cellular Neurobionics, Institute of Biology II, RWTH-Aachen University, Kopernikusstrasse 16, 52056 Aachen, Germany
| | - Klaus Groschner
- From the Institute of Pharmaceutical Sciences-Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria.
| |
Collapse
|
32
|
Schleifer H, Poteser M, Kappe CO, Romanin C, Groschner K. Store-operated calcium entry into rat basophil leukaemia cells: contribution of TRPC3 and Orai1. BMC Pharmacol 2009. [PMCID: PMC2778880 DOI: 10.1186/1471-2210-9-s2-a11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
33
|
Wakabayashi I, Marumo M, Graziani A, Poteser M, Groschner K. TRPC4 expression determines sensitivity of the platelet-type capacitative Ca2+entry channel to intracellular alkalosis. Platelets 2009; 17:454-61. [PMID: 17074721 DOI: 10.1080/09537100600757489] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [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: 10/24/2022]
Abstract
The present study was designed to analyze the molecular basis of the intracellular pH-dependent capacitative Ca2+ entry (CCE) of human platelets and megakaryocytic cells, specifically to test the hypothesis that members of the classical transient receptor potential (TRPC) protein family are involved in the CCE pathway that is promoted by intracellular alkalosis. Human platelets as well as the tested megakaryocytic cell lines (CMK cells, MEG-01 cells) and HEK293 cells displayed thapsigargin-induced CCE and responded to monensin with comparable elevation in intracellular pH. Promotion of CCE by monensin-induced intracellular alkalosis, however, was profound in mature platelets, moderate in CMK cells and lacking in MEG-01 cells as well as in HEK293 cells. Analysis of the TRPC expression pattern by immunoblotting revealed that mature platelets and CMK cells express TRPC4 along with TRPC1 and TRPC3, while TRPC4 is lacking in MEG-01 cells. HEK293 cells displayed CCE characteristics as well as lack of TRPC4 expression similar to MEG-01 cells. Over-expression of TRPC4 in HEK293 cells was found to result in a gain of pH-sensitivity of CCE with clearly detectable promotion of CCE in response to monensin. These results suggest that platelet CCE channel complexes contain TRPC4 as a molecular component that determines sensitivity of CCE to intracellular alkalosis.
Collapse
Affiliation(s)
- Ichiro Wakabayashi
- Department of Hygiene and Preventive Medicine, Yamagata University School of Medicine, Yamagata 990-9585, Japan.
| | | | | | | | | |
Collapse
|
34
|
Graziani A, Krenn M, Poteser M, Baumgartner W, Groschner K. Cellular Targeting And Function Of Trpc4 Channels In Human Vascular Endothelium. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.1303] [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: 11/30/2022] Open
|
35
|
Poteser M, Schleifer H, Romanin C, Groschner K. Amino Acid Residues Within The Putative Pore Region Of TRPC3 As Determinants Of Channel Regulation. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.1304] [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: 10/21/2022] Open
|
36
|
Schleifer H, Poteser M, Groschner K. Identification of amino acid residues relevant for gating and permeation of the cation channel TRPC3. BMC Pharmacol 2008. [PMCID: PMC3313224 DOI: 10.1186/1471-2210-8-s1-a34] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
37
|
Krenn EC, Wille I, Gesslbauer B, Poteser M, van Kuppevelt TH, Kungl AJ. Glycanogenomics: a qPCR-approach to investigate biological glycan function. Biochem Biophys Res Commun 2008; 375:297-302. [PMID: 18692483 DOI: 10.1016/j.bbrc.2008.07.144] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2008] [Accepted: 07/18/2008] [Indexed: 02/05/2023]
Abstract
As an indirect approach towards glycan structures, qRT-PCR analyses using the DeltaDeltaC(T) method were performed to investigate changes in expression levels of heparan sulfate-synthesising enzymes of stimulated and unstimulated HMVECs. We chose NDSTs as early enzymes initiating sulfation and 3OSTs which act late generating specific binding sites. Major changes in expression patterns were found for the NDST3 and 3OST1 isoforms. Both enzymes were down-regulated 7- and 6-fold, respectively, following TNF-alpha stimulation, and 3.5- and 7.6-fold following LPS-stimulation suggesting a common restructuring process of HS in inflammation leading to a less diverse sulfation pattern. Immunostaining of TNF-alpha-stimulated cells using a phage display-derived antibody specific for 3-O-sulfation and unsulfated regions of HS resulted in significant fluorescence changes between unstimulated and stimulated.
Collapse
Affiliation(s)
- Evelyn C Krenn
- Institute for Pharmaceutical Sciences, Department of Pharmaceutical Chemistry, University of Graz, Universitätsplatz 1, A-8010 Graz, Austria
| | | | | | | | | | | |
Collapse
|
38
|
Poteser M, Graziani A, Eder P, Yates A, Mächler H, Romanin C, Groschner K. Identification of a rare subset of adipose tissue-resident progenitor cells, which express CD133 and TRPC3 as a VEGF-regulated Ca2+ entry channel. FEBS Lett 2008; 582:2696-702. [PMID: 18602918 DOI: 10.1016/j.febslet.2008.06.049] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2008] [Revised: 06/16/2008] [Accepted: 06/26/2008] [Indexed: 11/30/2022]
Abstract
VEGF-induced Ca2+ signalling was investigated in CD133+/VEGFR-2+ progenitor cells isolated from human adipose stroma. Colonies derived from CD133+ immunoselected cells displayed inhomogenous Ca2+ signals, with variable magnitude of VEGF-induced Ca2+ entry, which positively correlated with expression of the Ca2+ channel protein TRPC3. High levels of VEGF-induced Ca2+ entry and TRPC3 expression were preferentially detected in rim areas of expanding colonies. Dominant negative suppression of TRPC3 inhibited VEGF-induced Ca2+ entry into CD133+ cells. Our results identify TRPC3 as a key Ca2+ entry channel in a subset of CD133+ stem cells. We suggest TRPC3 as an essential determinant of cell fate in CD133+ progenitor-derived colonies.
Collapse
Affiliation(s)
- Michael Poteser
- Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Graz, Austria
| | | | | | | | | | | | | |
Collapse
|
39
|
Yates A, Groschner K, Graziani A, Poteser M, Mächler H. Can cardiovascular diseases be treated with autologous fat cells? Analysis of tissue-resident stem cells from retrosternal fat identifies a CD34+/CD133+ population of potential endothelial progenitors. Thorac Cardiovasc Surg 2008. [DOI: 10.1055/s-2008-1037750] [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: 10/21/2022]
|
40
|
Graziani A, Krenn M, Poteser M, Groschner K. Cell adhesion-dependent trafficking and targeting of TRPC4 channels in human vascular endothelium. BMC Pharmacol 2007. [DOI: 10.1186/1471-2210-7-s2-a17] [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: 11/10/2022] Open
|
41
|
Abstract
TRPC3 represents one of the first identified mammalian relatives of the Drosophila trp gene product. Despite intensive biochemical and biophysical characterization as well as numerous attempts to uncover its physiological role in native cell systems, this channel protein still represents one of the most enigmatic members of the transient receptor potential (TRP) superfamily. TRPC3 is significantly expressed in brain and heart and likely to play a role in both non-excitable as well as excitable cells, being potentially involved in a wide spectrum of Ca2+ signalling mechanisms. Its ability to associate with a variety of partner proteins apparently enables TRPC3 to form different cation channels in native cells. TRPC3 cation channels display unique gating and regulatory properties that allow for recognition and integration of multiple input stimuli including lipid mediators and cellular Ca2+ gradients as well as redox signals. The physiological/pathophysiological functions of this highly versatile cation channel protein are as yet barely delineated. Here we summarize current knowledge on properties and possible signalling functions of TRPC3 and discuss the potential biological relevance of this signalling molecule.
Collapse
Affiliation(s)
- P Eder
- Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, 8010 Graz, Austria
| | | | | |
Collapse
|
42
|
Eder P, Probst D, Rosker C, Poteser M, Wolinski H, Kohlwein SD, Romanin C, Groschner K. Phospholipase C-dependent control of cardiac calcium homeostasis involves a TRPC3-NCX1 signaling complex. Cardiovasc Res 2006; 73:111-9. [PMID: 17129578 DOI: 10.1016/j.cardiores.2006.10.016] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2006] [Revised: 10/12/2006] [Accepted: 10/17/2006] [Indexed: 10/24/2022] Open
Abstract
OBJECTIVE Members of the classical transient receptor potential protein (TRPC) family are considered as key components of phospholipase C (PLC)-dependent Ca2+ signaling. Previous results obtained in the HEK 293 expression system suggested a physical and functional coupling of TRPC3 to the cardiac-type Na+/Ca2+ exchanger, NCX1 (sodium calcium exchanger 1). This study was designed to test for expression of TRPC3 (transient receptor potential channel 3) and for the existence of a native TRPC3/NCX1 signaling complex in rat cardiac myocytes. METHODS Protein expression and cellular distribution were determined by Western blot and immunocytochemistry. Protein-protein interactions were investigated by reciprocal co-immunoprecipitation and glutathione S-transferase (GST)-pulldown experiments. Recruitment of protein complexes into the plasma membrane was assayed by surface biotinylation. The functional role of TRPC3 was investigated by fluorimetric recording of angiotensin II-induced calcium signals employing a dominant negative knockdown strategy. RESULTS TRPC3 immunoreactivity was observed in surface plasma membrane regions and in an intracellular membrane system. Co-immunolabeling of TRPC3 and NCX1 indicated significant co-localization of the two proteins. Both co-immunoprecipitation and GST-pulldown experiments demonstrated association of TRPC3 with NCX1. PLC stimulation was found to trigger NCX-mediated Ca2+ entry, which was dependent on TRPC3-mediated Na+ loading of myocytes. This NCX-mediated Ca2+ signaling was significantly suppressed by expression of a dominant negative fragment of TRPC3. PLC stimulation was associated with increased membrane presentation of both TRPC3 and NCX1. CONCLUSION These results suggest a PLC-dependent recruitment of a TRPC3-NCX1 complex into the plasma membrane as a pivotal mechanism for the control of cardiac Ca2+ homeostasis.
Collapse
Affiliation(s)
- P Eder
- Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University, Graz, Austria
| | | | | | | | | | | | | | | |
Collapse
|
43
|
Graziani A, Rosker C, Kohlwein S, Zhu M, Romanin C, Sattler W, Groschner K, Poteser M. Cellular cholesterol controls TRPC3 function: evidence from a novel dominant-negative knockdown strategy. Biochem J 2006; 396:147-55. [PMID: 16448384 PMCID: PMC1449990 DOI: 10.1042/bj20051246] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [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: 11/17/2022]
Abstract
TRPC3 (canonical transient receptor potential protein 3) has been suggested to be a component of cation channel complexes that are targeted to cholesterol-rich lipid membrane microdomains. In the present study, we investigated the potential role of membrane cholesterol as a regulator of cellular TRPC3 conductances. Functional experiments demonstrated that cholesterol loading activates a non-selective cation conductance and a Ca2+ entry pathway in TRPC3-overexpressing cells but not in wild-type HEK-293 (human embryonic kidney 293) cells. The cholesterol-induced membrane conductance exhibited a current-to-voltage relationship similar to that observed upon PLC (phospholipase C)-dependent activation of TRPC3 channels. Nonetheless, the cholesterol-activated conductance lacked negative modulation by extracellular Ca2+, a typical feature of agonist-activated TRPC3 currents. Involvement of TRPC3 in the cholesterol-dependent membrane conductance was further corroborated by a novel dominant-negative strategy for selective blockade of TRPC3 channel activity. Expression of a TRPC3 mutant, which contained a haemagglutinin epitope tag in the second extracellular loop, conferred antibody sensitivity to both the classical PLC-activated as well as the cholesterol-activated conductance in TRPC3-expressing cells. Moreover, cholesterol loading as well as PLC stimulation was found to increase surface expression of TRPC3. Promotion of TRPC3 membrane expression by cholesterol was persistent over 30 min, while PLC-mediated enhancement of plasma membrane expression of TRPC3 was transient in nature. We suggest the cholesterol content of the plasma membrane as a determinant of cellular TRPC3 activity and provide evidence for cholesterol dependence of TRPC3 surface expression.
Collapse
Affiliation(s)
- Annarita Graziani
- *Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, A-8010 Graz, Austria
| | - Christian Rosker
- *Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, A-8010 Graz, Austria
| | - Sepp D. Kohlwein
- †Institute of Molecular Biosciences, Karl-Franzens-University of Graz, A-8010 Graz, Austria
| | - Michael X. Zhu
- ‡Department of Neuroscience and Center for Molecular Neurobiology, The Ohio State University, Columbus, OH 43210, U.S.A
| | | | - Wolfgang Sattler
- ∥Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University Graz, A-8010 Graz, Austria
| | - Klaus Groschner
- *Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, A-8010 Graz, Austria
- To whom correspondence should be addressed (email )
| | - Michael Poteser
- *Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, A-8010 Graz, Austria
| |
Collapse
|
44
|
Poteser M, Graziani A, Rosker C, Eder P, Derler I, Kahr H, Zhu MX, Romanin C, Groschner K. TRPC3 and TRPC4 associate to form a redox-sensitive cation channel. Evidence for expression of native TRPC3-TRPC4 heteromeric channels in endothelial cells. J Biol Chem 2006; 281:13588-13595. [PMID: 16537542 DOI: 10.1074/jbc.m512205200] [Citation(s) in RCA: 160] [Impact Index Per Article: 8.9] [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: 11/06/2022] Open
Abstract
Canonical transient receptor potential proteins (TRPC) have been proposed to form homo- or heteromeric cation channels in a variety of tissues, including the vascular endothelium. Assembly of TRPC multimers is incompletely understood. In particular, heteromeric assembly of distantly related TRPC isoforms is still a controversial issue. Because we have previously suggested TRPC proteins as the basis of the redox-activated cation conductance of porcine aortic endothelial cells (PAECs), we set out to analyze the TRPC subunit composition of endogenous endothelial TRPC channels and report here on a redox-sensitive TRPC3-TRPC4 channel complex. The ability of TRPC3 and TRPC4 proteins to associate and to form a cation-conducting pore complex was supported by four lines of evidence as follows: 1) Co-immunoprecipitation experiments in PAECs and in HEK293 cells demonstrated the association of TRPC3 and TRPC4 in the same complex. 2) Fluorescence resonance energy transfer analysis demonstrated TRPC3-TRPC4 association, involving close proximity between the N terminus of TRPC4 and the C terminus of TRPC3 subunits. 3) Co-expression of TRPC3 and TRPC4 in HEK293 cells generated a channel that displayed distinct biophysical and regulatory properties. 4) Expression of dominant-negative TRPC4 proteins suppressed TRPC3-related channel activity in the HEK293 expression system and in native endothelial cells. Specifically, an extracellularly hemagglutinin (HA)-tagged TRPC4 mutant, which is sensitive to blockage by anti-HA-antibody, was found to transfer anti-HA sensitivity to both TRPC3-related currents in the HEK293 expression system and the redox-sensitive cation conductance of PAECs. We propose TRPC3 and TRPC4 as subunits of native endothelial cation channels that are governed by the cellular redox state.
Collapse
Affiliation(s)
- Michael Poteser
- Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, A-8010 Graz, Austria
| | - Annarita Graziani
- Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, A-8010 Graz, Austria
| | - Christian Rosker
- Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, A-8010 Graz, Austria
| | - Petra Eder
- Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, A-8010 Graz, Austria
| | - Isabella Derler
- Institute of Biophysics, University of Linz, A-4020 Linz, Austria
| | - Heike Kahr
- Institute of Biophysics, University of Linz, A-4020 Linz, Austria
| | - Michael X Zhu
- Department of Neuroscience and Center for Molecular Neurobiology, The Ohio State University, Columbus, Ohio 43210
| | | | - Klaus Groschner
- Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, A-8010 Graz, Austria.
| |
Collapse
|
45
|
Wakabayashi I, Poteser M, Groschner K. Intracellular pH as a determinant of vascular smooth muscle function. J Vasc Res 2006; 43:238-50. [PMID: 16449818 DOI: 10.1159/000091235] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [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: 05/24/2005] [Accepted: 11/20/2005] [Indexed: 11/19/2022] Open
Abstract
Intracellular pH (pHi) is a physiological parameter that is intimately linked to contractility, growth and proliferation of vascular smooth muscle (VSM). Regarding contractility, no general unifying concept of pHi regulation but a rather complex relation between pHi signals and vascular tone has been revealed so far. The modulation of vasotone by pHi depends on the type of blood vessel as well as on the pattern of regulatory input signals. In addition, changes in pHi have been recognized as an important cellular signal to determine the fate of cells in terms of proliferation or apoptosis. Cellular sensors for pHi include a variety of ion transport systems which control intracellular Ca2+ gradients and are likely to serve as a link between pHi and cell functions. Here we provide an overview on the potential targets and mechanisms that transduce pHi signals in VSM. The role of pHi-sensing signaling complexes and localized pHi signaling as the basis of diversity of pHi regulation of VSM function is discussed.
Collapse
Affiliation(s)
- Ichiro Wakabayashi
- Department of Hygiene and Preventive Medicine, Yamagata University School of Medicine, Yamagata, Japan.
| | | | | |
Collapse
|
46
|
Eder P, Poteser M, Romanin C, Groschner K. Na(+) entry and modulation of Na(+)/Ca(2+) exchange as a key mechanism of TRPC signaling. Pflugers Arch 2005; 451:99-104. [PMID: 15924237 DOI: 10.1007/s00424-005-1434-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [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: 04/01/2005] [Accepted: 04/08/2005] [Indexed: 10/25/2022]
Abstract
Ion channels formed by canonical transient receptor potential (TRPC) proteins are considered to be key players in cellular Ca(2+) homeostasis. As permeation of Ca(2+) through TRPC homo- and/or heteromeric channels has been repeatedly demonstrated, analysis of the physiological role of TRPC proteins was so far based on the concept that these proteins form regulated Ca(2+) entry channels. The well-recognized lack of cation selectivity of TRPC channels and the ability to generate substantial monovalent conductances that govern membrane potential and cation gradients were barely appreciated as a physiologically relevant issue. Nonetheless, recent studies suggest monovalent, specifically Na(+) permeation through TRPC cation channels as an important event in TRPC signaling. TRPC-mediated Na(+) entry may be converted into a distinct pattern of cellular Ca(2+) signals by interaction with Na(+)/Ca(2+) exchanger proteins. This review discusses current concepts regarding the link between Na(+) entry through TRPC channels and cellular Ca(2+) signaling.
Collapse
Affiliation(s)
- Petra Eder
- Institute of Pharmaceutical Sciences, Pharmacology and Toxicology, Karl-Franzens-University of Graz, Universitaetsplatz 2, 8010 Graz, Austria
| | | | | | | |
Collapse
|
47
|
Abstract
1. We investigated the effects of serum albumin on inducible nitric oxide synthase (iNOS) expression in RAW 267.4 macrophages. Crude fraction-V type albumin as well as bovine serum albumin filtrated for endotoxin induced concentration-dependent iNOS expression in macrophages. Accordingly, NO production (estimated by supernatant nitrite) was markedly (up to 10-fold) increased in the presence of albumin. 2. Albumin-induced expression of iNOS protein was inhibited by cycloheximide and NO production was abolished after incubation of the cells with an iNOS inhibitor, N(G)-monomethyl-l-arginine (LNMMA). 3. An inhibitor of the NF-kappaB pathway, pyrrolidine dithiocarbamate (PDTC), as well as inhibitors of JAK2/STAT and ERK, AG490 and U0126, respectively, significantly reduced albumin-induced iNOS expression and NO production, while an inhibitor of the p38 pathway, SB203580, did not significantly affect NO production induced by albumin. 4. Both types of serum albumin were contaminated with traces of endotoxin. The endotoxin levels were found not to be sufficient for the observed induction of nitrite production in RAW 267.4 cells. In addition, the albumin-stimulated induction of iNOS was not reduced by preincubation of albumin-containing media with polymyxin B, a LPS inhibitor. 5. Polymerised albumin fractions were detected in the commercially available albumin tested in this study. A monomeric albumin-rich fraction, separated by ultrafiltration, showed a potent inducing effect on iNOS expression and NO production, while a polymer-rich fraction showed a smaller effect. 6. Advanced glycation endproducts (AGE) of albumin were not formed by interaction with glucose in incubation medium, as AGE was not increased even after long-time (4 weeks) incubation in albumin-containing media [3.2-4.4 microg ml(-1) (basal) vs 4.8-5.6 microg ml(-1) (in glucose-containing media)]. However, the duration of albumin exposure to glucose influenced the basal stimulatory properties of albumin. 7. Our results suggest that serum albumin fractions, as gained by cold alcoholic extraction, may include determinants that stimulate or further enhance stimulation of RAW 267.4 cells and are different from endotoxin, polymeric albumin and AGE.
Collapse
Affiliation(s)
- Michael Poteser
- Department of Hygiene and Preventive Medicine, Yamagata University School of Medicine, Yamagata 990-9585, Japan
| | - Ichiro Wakabayashi
- Department of Hygiene and Preventive Medicine, Yamagata University School of Medicine, Yamagata 990-9585, Japan
- Author for correspondence:
| |
Collapse
|
48
|
Takahashi Y, Poteser M, Negoro M, Wakabayashi I. Reduction of lipopolysaccharide-induced cyclooxygenase-2 expression in diabetic arteries. Naunyn Schmiedebergs Arch Pharmacol 2004; 369:358-62. [PMID: 14735296 DOI: 10.1007/s00210-003-0853-x] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2003] [Accepted: 11/07/2003] [Indexed: 10/26/2022]
Abstract
In order to clarify the effects of diabetes mellitus on induction of cyclooxygenase (COX)-2 and subsequent prostaglandin production in blood vessels, we investigated lipopolysaccharide (LPS)-induced COX-2 induction and prostacyclin production in aortic strips isolated from streptozotocin-induced diabetic rats and vehicle-injected control rats. The rats at 10 weeks after injection of streptozotocin had significantly lower body weights and higher serum glucose levels compared with those in the control rats. LPS stimulation resulted in a marked increase in the release of prostacyclin from the aortic strips. This increase was abolished in the presence of indomethacin or cycloheximide but was not affected by removal of the endothelium. In diabetic aortae, both LPS-induced prostacyclin production and COX-2 induction were diminished compared with the control aortae. No significant difference in COX-1 expression was observed between diabetic and control aortae. The diminution of LPS-induced COX-2 expression was also observed in alveolar macrophages isolated from diabetic rats. These results suggest that COX-2 expression and subsequent prostacyclin production in response to LPS are selectively attenuated in diabetic blood vessels.
Collapse
Affiliation(s)
- Yuji Takahashi
- Department of Hygiene and Preventive Medicine, Yamagata University School of Medicine, Iida-Nishi 2-2-2, 990-9585 Yamagata, Japan
| | | | | | | |
Collapse
|
49
|
Poteser M, Wakabayashi I, Rosker C, Teubl M, Schindl R, Soldatov NM, Romanin C, Groschner K. Crosstalk between voltage-independent Ca2+ channels and L-type Ca2+ channels in A7r5 vascular smooth muscle cells at elevated intracellular pH: evidence for functional coupling between L-type Ca2+ channels and a 2-APB-sensitive cation channel. Circ Res 2003; 92:888-96. [PMID: 12663491 DOI: 10.1161/01.res.0000069216.80612.66] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study was designed to investigate the role of voltage-independent and voltage-dependent Ca2+ channels in the Ca2+ signaling associated with intracellular alkalinization in A7r5 vascular smooth muscle cells. Extracellular administration of ammonium chloride (20 mmol/L) resulted in elevation of intracellular pH and activation of a sustained Ca2+ entry that was inhibited by 2-amino-ethoxydiphenyl borate (2-APB, 200 micromol/L) but not by verapamil (10 micro;mol/L). Alkalosis-induced Ca2+ entry was mediated by a voltage-independent cation conductance that allowed permeation of Ca2+ (PCa/PNa approximately 6), and was associated with inhibition of L-type Ca2+ currents. Alkalosis-induced inhibition of L-type Ca2+ currents was dependent on the presence of extracellular Ca2+ and was prevented by expression of a dominant-negative mutant of calmodulin. In the absence of extracellular Ca2+, with Ba2+ or Na+ as charge carrier, intracellular alkalosis failed to inhibit but potentiated L-type Ca2+ channel currents. Inhibition of Ca2+ currents through voltage-independent cation channels by 2-APB prevented alkalosis-induced inhibition of L-type Ca2+ currents. Similarly, 2-APB prevented vasopressin-induced activation of nonselective cation channels and inhibition of L-type Ca2+ currents. We suggest the existence of a pH-controlled Ca2+ entry pathway that governs the activity of smooth muscle L-type Ca2+ channels due to control of Ca2+/calmodulin-dependent negative feedback regulation. This Ca2+ entry pathway exhibits striking similarity with the pathway activated by stimulation of phospholipase-C-coupled receptors, and may involve a similar type of cation channel. We demonstrate for the first time the tight functional coupling between these voltage-independent Ca2+ channels and classical voltage-gated L-type Ca2+ channels.
Collapse
Affiliation(s)
- Michael Poteser
- Department of Pharmacology and Toxicology, School of Medicine, Yamagata University, Yamagata, Japan
| | | | | | | | | | | | | | | |
Collapse
|
50
|
Poteser M, Wakabayashi I. 4P-1115 Effects of serum albumin on iNOS and COX-2 expression in macrophages and vascular smooth muscle. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)91371-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|