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Trollebø M, Tangvik R, Morken M, Nygård O, Eagan T, Grønning M, Andreassen A, Dierkes J. Nutritional Predictors Of Mortality. Clin Nutr ESPEN 2023. [DOI: 10.1016/j.clnesp.2022.09.212] [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: 03/28/2023]
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Tibajev A, Nygård O. Origin-country gender norms, individual work experience, and employment among immigrant women in Sweden. Front Hum Dyn 2023. [DOI: 10.3389/fhumd.2023.1071800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Many Western countries are built on a dual-earner model and have high levels of female labor force participation. Increasing the labor market activity of immigrant women is therefore seen as a key part of immigrant integration. However, female labor force participation (LFP) differs substantially between countries, reflecting differences in work-related gender norms that can continue to influence preferences and behaviors after migration. In this study, we investigate how origin-country gender norms and migrant selection interact to produce post-migration outcomes. Our data shows that immigrant women in Sweden have a higher level of pre-migration work experience than expected based on origin-country female LFP, indicating positive selection. Furthermore, the association between origin-country LFP and post-migration employment varied with work experience. For women without origin-country work experience, origin-country LFP was positively associated with employment in Sweden. For women with origin-country work experience, origin-country LFP however was not associated with higher likelihood of employment in Sweden. Though our focus is on immigrant women, we also include immigrant men in our analysis to test our prediction more thoroughly. For men without origin-country work experience, origin-country LFP was negatively associated with employment in Sweden, while we found no association for men with origin-country work experience. Our results show that migrant selection is a crucial factor in understanding the relationship between origin-country LFP and post-migration labor market outcomes, and that these patterns vary with gender. Policy interventions targeting immigrant women from countries with low female LFP should therefore not assume that women arrive socialized with gender-norms that hinder labor market activity.
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Breznau N, Rinke EM, Wuttke A, Nguyen HHV, Adem M, Adriaans J, Alvarez-Benjumea A, Andersen HK, Auer D, Azevedo F, Bahnsen O, Balzer D, Bauer G, Bauer PC, Baumann M, Baute S, Benoit V, Bernauer J, Berning C, Berthold A, Bethke FS, Biegert T, Blinzler K, Blumenberg JN, Bobzien L, Bohman A, Bol T, Bostic A, Brzozowska Z, Burgdorf K, Burger K, Busch KB, Carlos-Castillo J, Chan N, Christmann P, Connelly R, Czymara CS, Damian E, Ecker A, Edelmann A, Eger MA, Ellerbrock S, Forke A, Forster A, Gaasendam C, Gavras K, Gayle V, Gessler T, Gnambs T, Godefroidt A, Grömping M, Groß M, Gruber S, Gummer T, Hadjar A, Heisig JP, Hellmeier S, Heyne S, Hirsch M, Hjerm M, Hochman O, Hövermann A, Hunger S, Hunkler C, Huth N, Ignácz ZS, Jacobs L, Jacobsen J, Jaeger B, Jungkunz S, Jungmann N, Kauff M, Kleinert M, Klinger J, Kolb JP, Kołczyńska M, Kuk J, Kunißen K, Kurti Sinatra D, Langenkamp A, Lersch PM, Löbel LM, Lutscher P, Mader M, Madia JE, Malancu N, Maldonado L, Marahrens H, Martin N, Martinez P, Mayerl J, Mayorga OJ, McManus P, McWagner K, Meeusen C, Meierrieks D, Mellon J, Merhout F, Merk S, Meyer D, Micheli L, Mijs J, Moya C, Neunhoeffer M, Nüst D, Nygård O, Ochsenfeld F, Otte G, Pechenkina AO, Prosser C, Raes L, Ralston K, Ramos MR, Roets A, Rogers J, Ropers G, Samuel R, Sand G, Schachter A, Schaeffer M, Schieferdecker D, Schlueter E, Schmidt R, Schmidt KM, Schmidt-Catran A, Schmiedeberg C, Schneider J, Schoonvelde M, Schulte-Cloos J, Schumann S, Schunck R, Schupp J, Seuring J, Silber H, Sleegers W, Sonntag N, Staudt A, Steiber N, Steiner N, Sternberg S, Stiers D, Stojmenovska D, Storz N, Striessnig E, Stroppe AK, Teltemann J, Tibajev A, Tung B, Vagni G, Van Assche J, van der Linden M, van der Noll J, Van Hootegem A, Vogtenhuber S, Voicu B, Wagemans F, Wehl N, Werner H, Wiernik BM, Winter F, Wolf C, Yamada Y, Zhang N, Ziller C, Zins S, Żółtak T. Observing many researchers using the same data and hypothesis reveals a hidden universe of uncertainty. Proc Natl Acad Sci U S A 2022; 119:e2203150119. [PMID: 36306328 PMCID: PMC9636921 DOI: 10.1073/pnas.2203150119] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Accepted: 08/22/2022] [Indexed: 11/25/2022] Open
Abstract
This study explores how researchers' analytical choices affect the reliability of scientific findings. Most discussions of reliability problems in science focus on systematic biases. We broaden the lens to emphasize the idiosyncrasy of conscious and unconscious decisions that researchers make during data analysis. We coordinated 161 researchers in 73 research teams and observed their research decisions as they used the same data to independently test the same prominent social science hypothesis: that greater immigration reduces support for social policies among the public. In this typical case of social science research, research teams reported both widely diverging numerical findings and substantive conclusions despite identical start conditions. Researchers' expertise, prior beliefs, and expectations barely predict the wide variation in research outcomes. More than 95% of the total variance in numerical results remains unexplained even after qualitative coding of all identifiable decisions in each team's workflow. This reveals a universe of uncertainty that remains hidden when considering a single study in isolation. The idiosyncratic nature of how researchers' results and conclusions varied is a previously underappreciated explanation for why many scientific hypotheses remain contested. These results call for greater epistemic humility and clarity in reporting scientific findings.
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Affiliation(s)
- Nate Breznau
- Research Center on Inequality and Social Policy (SOCIUM), University of Bremen, Bremen, 28359, Germany
| | - Eike Mark Rinke
- School of Politics and International Studies, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Alexander Wuttke
- Mannheim Centre for European Social Research, University of Mannheim, 68131 Mannheim, Germany
- Department of Political Science, Ludwig Maximilian University, 80539 Munich, Germany
| | - Hung H. V. Nguyen
- Research Center on Inequality and Social Policy (SOCIUM), University of Bremen, Bremen, 28359, Germany
- Bremen International Graduate School of Social Sciences, 28359 Bremen, Germany
| | - Muna Adem
- Department of Sociology, Indiana University, Bloomington, IN 47405
| | - Jule Adriaans
- Socio-Economic Panel Study (SOEP), German Institute for Economic Research (DIW), 10117 Berlin, Germany
| | - Amalia Alvarez-Benjumea
- Mechanisms of Normative Change, Max Planck Institute for Research on Collective Goods, 53113 Bonn, Germany
| | - Henrik K. Andersen
- Institute of Sociology, Chemnitz University of Technology, 09126 Chemnitz, Germany
| | - Daniel Auer
- Mannheim Centre for European Social Research, University of Mannheim, 68131 Mannheim, Germany
| | - Flavio Azevedo
- Department of Psychology, University of Cambridge, Cambridge, CB23RQ, United Kingdom
| | - Oke Bahnsen
- School of Social Sciences, University of Mannheim, 68159 Mannheim, Germany
| | - Dave Balzer
- Institute of Sociology, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
| | - Gerrit Bauer
- Department of Sociology, Ludwig Maximilian University, 80801 Munich, Germany
| | - Paul C. Bauer
- Mannheim Centre for European Social Research, University of Mannheim, 68131 Mannheim, Germany
| | - Markus Baumann
- Heidelberg University, 69117 Heidelberg, Germany
- Institute for Political Science, Goethe University Frankfurt, 60323 Frankfurt, Germany
| | - Sharon Baute
- Comparative Political Economy, University of Konstanz, 78457 Konstanz, Germany
| | - Verena Benoit
- Department of Political Science, Ludwig Maximilian University, 80539 Munich, Germany
- Faculty of Social Sciences, Economics, and Business Administration, University of Bamberg, 96052 Bamberg, Germany
| | - Julian Bernauer
- Mannheim Centre for European Social Research, University of Mannheim, 68131 Mannheim, Germany
| | - Carl Berning
- Institute for Political Science, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
| | - Anna Berthold
- Faculty of Social Sciences, Economics, and Business Administration, University of Bamberg, 96052 Bamberg, Germany
| | - Felix S. Bethke
- Research Department on Intrastate Conflict, Peace Research Institute Frankfurt, 60329 Frankfurt, Germany
| | - Thomas Biegert
- Department of Social Policy, London School of Economics and Political Science, London, WC2A 2AE, United Kingdom
| | - Katharina Blinzler
- Survey Data Curation, Leibniz Institute for the Social Sciences (GESIS), 50667 Cologne, Germany
| | - Johannes N. Blumenberg
- Knowledge Exchange and Outreach, Leibniz Institute for the Social Sciences (GESIS), 68159 Mannheim, Germany
| | - Licia Bobzien
- Jacques Delors Centre, Hertie School, 10117 Berlin, Germany
| | - Andrea Bohman
- Department of Sociology, Umeå University, 90187 Umeå, Sweden
| | - Thijs Bol
- Social Research Institute, Institute of Education, University College London, London, WC1H 0AL, United Kingdom
- Department of Sociology, University of Amsterdam, 1001 Amsterdam, The Netherlands
| | - Amie Bostic
- Department of Sociology, The University of Texas Rio Grande Valley, Brownsville, TX 78520
| | - Zuzanna Brzozowska
- Vienna Institute of Demography, Austrian Academy of Sciences, 1030 Vienna, Austria
- Austrian National Public Health Institute, Gesundheit Österreich (GÖG), 1030 Vienna, Austria
| | - Katharina Burgdorf
- School of Social Sciences, University of Mannheim, 68159 Mannheim, Germany
| | - Kaspar Burger
- Social Research Institute, Institute of Education, University College London, London, WC1H 0AL, United Kingdom
- Department of Sociology, University of Zurich, 8050 Zurich, Switzerland
- Jacobs Center for Productive Youth, University of Zurich, 8050 Zurich, Switzerland
| | | | - Juan Carlos-Castillo
- Department of Sociology, University of Chile, Santiago, 7800284, Chile
- Center for Social Conflict and Cohesion Studies (COES), Pontificia Universidad Católica de Chile, Santiago, 8331150, Chile
| | - Nathan Chan
- Department of Political Science and International Relations, Loyola Marymount University, Los Angeles, CA 90045
| | - Pablo Christmann
- Data and Research on Society, Leibniz Institute for the Social Sciences, 68159 Mannheim, Germany
| | - Roxanne Connelly
- School of Social and Political Science, University of Edinburgh, Edinburgh, EH8 9LD, United Kingdom
| | | | - Elena Damian
- Lifestyle and Chronic Diseases, Epidemiology and Public Health, Sciensano, 1000 Brussels, Belgium
| | - Alejandro Ecker
- Mannheim Centre for European Social Research, University of Mannheim, 68131 Mannheim, Germany
| | | | - Maureen A. Eger
- Department of Sociology, Umeå University, 90187 Umeå, Sweden
| | - Simon Ellerbrock
- Mannheim Centre for European Social Research, University of Mannheim, 68131 Mannheim, Germany
- School of Social Sciences, University of Mannheim, 68159 Mannheim, Germany
| | | | - Andrea Forster
- Empirical Educational and Higher Education Research, Freie Universität Berlin, 14195 Berlin, Germany
| | - Chris Gaasendam
- Department of Sociology, Center for Sociological Research, KU Leuven, 3000 Leuven, Belgium
| | - Konstantin Gavras
- School of Social Sciences, University of Mannheim, 68159 Mannheim, Germany
| | - Vernon Gayle
- School of Social and Political Science, University of Edinburgh, Edinburgh, EH8 9LD, United Kingdom
| | - Theresa Gessler
- Kulturwissenschaftliche Fakultät, European University Viadrina, 15230 Frankfurt (Oder), Germany
| | - Timo Gnambs
- Educational Measurement, Leibniz Institute for Educational Trajectories, 96047 Bamberg, Germany
| | - Amélie Godefroidt
- Centre for Research on Peace and Development, KU Leuven, 3000 Leuven, Belgium
| | - Max Grömping
- School of Government and International Relations, Griffith University, Nathan, QLD, 4111, Australia
| | - Martin Groß
- Department of Sociology, University of Tübingen, 72074 Tübingen, Germany
| | - Stefan Gruber
- Max Planck Institute for Social Law and Social Policy, 80799 Munich, Germany
| | - Tobias Gummer
- Data and Research on Society, Leibniz Institute for the Social Sciences, 68159 Mannheim, Germany
| | - Andreas Hadjar
- University of Luxembourg, 4365 Esch-sur-Alzette, Luxembourg
- Wirtschafts- und Sozialwissenschaftliches Institut (WSI), Hans Böckler Foundation, 40474 Düsseldorf, Germany
- University of Fribourg, 1700 Fribourg, Switzerland
- Department of Social Sciences, University of Luxembourg, 4366 Esch-sur-Alzette, Luxembourg
| | - Jan Paul Heisig
- University of Groningen, 9712 CP Groningen,The Netherlands
- Research Group "Health and Social Inequality", Berlin Social Science Center (WZB), 10785 Berlin, Germany
| | - Sebastian Hellmeier
- Transformations of Democracy Unit, Berlin Social Science Center (WZB), 10785 Berlin, Germany
| | - Stefanie Heyne
- Mannheim Centre for European Social Research, University of Mannheim, 68131 Mannheim, Germany
| | - Magdalena Hirsch
- Research Unit Migration, Integration, Transnationalization, Berlin Social Science Center (WZB), 10785 Berlin, Germany
| | - Mikael Hjerm
- Department of Sociology, Umeå University, 90187 Umeå, Sweden
| | - Oshrat Hochman
- Data and Research on Society, Leibniz Institute for the Social Sciences, 68159 Mannheim, Germany
| | - Andreas Hövermann
- Wirtschafts- und Sozialwissenschaftliches Institut (WSI), Hans Böckler Foundation, 40474 Düsseldorf, Germany
- German Socio-Economic Panel Survey, 10117 Berlin, Germany
| | - Sophia Hunger
- Center for Civil Society Research, Berlin Social Science Center, 10785 Berlin, Germany
| | - Christian Hunkler
- Berlin Institute for Integration and Migration Research (BIM), Humboldt University Berlin, 10099 Berlin, Germany
| | - Nora Huth
- School of Human and Social Sciences, University of Wuppertal, 42119 Wuppertal, Germany
| | - Zsófia S. Ignácz
- Institute of Sociology, Goethe University Frankfurt, 60323 Frankfurt, Germany
| | - Laura Jacobs
- Department of Political Science, Université Libre de Bruxelles, 1050 Bruxelles, Belgium
| | - Jannes Jacobsen
- Zeppelin University, 88045 Friedrichshafen, Germany
- Cluster "Data-Methods-Monitoring", German Center for Integration and Migration Research (DeZIM),10117 Berlin, Germany
| | - Bastian Jaeger
- Department of Social Psychology, Tilburg University, 5037AB Tilburg, The Netherlands
| | - Sebastian Jungkunz
- Institute for Socio-Economics, University of Duisburg-Essen, 47057 Duisburg, Germany
- Institute of Political Science, University of Münster, 48149 Münster, Germany
- Chair of Political Sociology, University of Bamberg, 96052 Bamberg, Germany
| | - Nils Jungmann
- Survey Data Curation, Leibniz Institute for the Social Sciences (GESIS), 50667 Cologne, Germany
| | - Mathias Kauff
- Department of Psychology, Medical School Hamburg, 20457 Hamburg, Germany
| | - Manuel Kleinert
- Institute of Sociology, Justus Liebig University of Giessen, 35394 Giessen, Germany
| | - Julia Klinger
- Institute of Sociology and Social Psychology, University of Cologne, 50931 Cologne, Germany
| | - Jan-Philipp Kolb
- Federal Statistics Office Germany, Destatis, 65189 Wiesbaden, Germany
| | - Marta Kołczyńska
- Department of Research on Social and Institutional Transformations, Institute of Political Studies of the Polish Academy of Sciences, 00-625 Warsaw, Poland
| | - John Kuk
- Department of Political Science, University of Oklahoma, Norman, OK 73019
| | - Katharina Kunißen
- Institute of Sociology, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
| | | | | | - Philipp M. Lersch
- Socio-Economic Panel Study (SOEP), German Institute for Economic Research (DIW), 10117 Berlin, Germany
- Department of Social Sciences, Humboldt University Berlin, 10099 Berlin, Germany
| | - Lea-Maria Löbel
- Socio-Economic Panel Study (SOEP), German Institute for Economic Research (DIW), 10117 Berlin, Germany
| | - Philipp Lutscher
- Department of Political Science, University of Oslo, 0851 Oslo, Norway
| | - Matthias Mader
- Department of Politics and Public Administration, University of Konstanz, 78457 Konstanz, Germany
| | - Joan E. Madia
- Department of Sociology, Nuffield College, University of Oxford, Oxford, OX1 1JD, United Kingdom
- Institute for the Evaluation of Public Policies, Fondazione Bruno Kessler, 38122 Trento, Italy
| | - Natalia Malancu
- The Institute of Citizenship Studies (InCite), University of Geneva, 1205 Geneva, Switzerland
| | - Luis Maldonado
- Instituto de Sociologia, Pontifical Catholic University of Chile, Santiago, 7820436, Chile
| | - Helge Marahrens
- Department of Sociology, Indiana University, Bloomington, IN 47405
| | - Nicole Martin
- Department of Politics, University of Manchester, Manchester, M19 2JS, United Kingdom
| | - Paul Martinez
- Department of Institutional Research, Western Governors University, Salt Lake City, UT 84107
| | - Jochen Mayerl
- Institute of Sociology, Chemnitz University of Technology, 09126 Chemnitz, Germany
| | - Oscar J. Mayorga
- Department of Sociology, University of California, Los Angeles, CA 90095
| | - Patricia McManus
- Department of Sociology, Indiana University, Bloomington, IN 47405
| | - Kyle McWagner
- Department of Political Science, The University of California, Irvine, CA 92617
| | - Cecil Meeusen
- Department of Sociology, Center for Sociological Research, KU Leuven, 3000 Leuven, Belgium
| | - Daniel Meierrieks
- Research Unit Migration, Integration, Transnationalization, Berlin Social Science Center (WZB), 10785 Berlin, Germany
| | - Jonathan Mellon
- Department of Politics, University of Manchester, Manchester, M19 2JS, United Kingdom
| | - Friedolin Merhout
- Department of Sociology and Centre for Social Data Science, University of Copenhagen, 1353 Copenhagen, Denmark
| | - Samuel Merk
- Department of School Development, University of Education Karlsruhe, 76133 Karlsruhe, Germany
| | - Daniel Meyer
- Department of Education and Social Sciences, University of Cologne, 50931 Cologne, Germany
| | - Leticia Micheli
- Department of Psychology III, Julius-Maximilians University Würzburg, 97070 Würzburg, Germany
| | - Jonathan Mijs
- Department of Sociology, Boston University, Boston, MA 02215
| | - Cristóbal Moya
- Faculty of Sociology, Bielefeld University, 33615 Bielefeld, Germany
| | - Marcel Neunhoeffer
- School of Social Sciences, University of Mannheim, 68159 Mannheim, Germany
| | - Daniel Nüst
- Department of Geosciences, University of Münster, 49149 Münster, Germany
| | - Olav Nygård
- Division of Migration, Ethnicity and Society (REMESO), Linköping University, 60174 Linköping, Sweden
| | - Fabian Ochsenfeld
- Administrative Headquarters, Max Planck Society, 80539 Berlin, Germany
| | - Gunnar Otte
- Institute of Sociology, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
| | | | - Christopher Prosser
- Department of Politics, International Relations and Philosophy, Royal Holloway University of London, London, TW20 0EX, United Kingdom
| | - Louis Raes
- Department of Economics, Tilburg University, 5037AB Tilburg, The Netherlands
| | - Kevin Ralston
- School of Social and Political Science, University of Edinburgh, Edinburgh, EH8 9LD, United Kingdom
| | - Miguel R. Ramos
- Department of Social Policy, Sociology and Criminology, University of Birmingham, Birmingham, B15 2TT, United Kingdom
| | - Arne Roets
- Department of Developmental, Personality and Social Psychology, Ghent University, 9000 Ghent, Belgium
| | - Jonathan Rogers
- Division of Social Science, New York University Abu Dhabi, Abu Dhabi, 10276, United Arab Emirates
| | - Guido Ropers
- School of Social Sciences, University of Mannheim, 68159 Mannheim, Germany
| | - Robin Samuel
- University of Luxembourg, 4365 Esch-sur-Alzette, Luxembourg
- Department of Social Sciences, University of Luxembourg, 4366 Esch-sur-Alzette, Luxembourg
| | - Gregor Sand
- Max Planck Institute for Social Law and Social Policy, 80799 Munich, Germany
| | - Ariela Schachter
- Department of Sociology, Washington University in St. Louis, St. Louis, MO 63130
| | - Merlin Schaeffer
- Department of Sociology, University of Copenhagen, 1353 Copenhagen, Denmark
| | - David Schieferdecker
- Institute for Media and Communication Studies, Freie Universität Berlin, 14195 Berlin, Germany
| | - Elmar Schlueter
- Institute of Sociology, Justus Liebig University of Giessen, 35394 Giessen, Germany
| | - Regine Schmidt
- Faculty of Social Sciences, Economics, and Business Administration, University of Bamberg, 96052 Bamberg, Germany
| | - Katja M. Schmidt
- Socio-Economic Panel Study (SOEP), German Institute for Economic Research (DIW), 10117 Berlin, Germany
| | | | | | - Jürgen Schneider
- Tübingen School of Education, University of Tübingen, 72074 Tübingen, Germany
| | - Martijn Schoonvelde
- University College Dublin, Dublin 4, Ireland
- Department of European Languages and Cultures, University of Groningen, 9712 EK Groningen, The Netherlands
| | - Julia Schulte-Cloos
- Robert Schuman Center for Advanced Studies, European University Institute, 50133 Florence, Italy
| | - Sandy Schumann
- Department of Security and Crime Science, University College London, London,WC1E 6BT, United Kingdom
| | - Reinhard Schunck
- School of Human and Social Sciences, University of Wuppertal, 42119 Wuppertal, Germany
| | - Jürgen Schupp
- Socio-Economic Panel Study (SOEP), German Institute for Economic Research (DIW), 10117 Berlin, Germany
| | - Julian Seuring
- Department of Migration, Leibniz Institute for Educational Trajectories, 96047 Bamberg, Germany
| | - Henning Silber
- Department of Survey Design and Methodology, Leibniz Institute for the Social Sciences (GESIS), 68159 Mannheim, Germany
| | - Willem Sleegers
- Department of Social Psychology, Tilburg University, 5037AB Tilburg, The Netherlands
| | - Nico Sonntag
- Institute of Sociology, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
| | | | - Nadia Steiber
- Department of Sociology, University of Vienna, 1090 Vienna, Austria
| | - Nils Steiner
- Institute for Political Science, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
| | | | - Dieter Stiers
- Center for Political Science Research, KU Leuven, 3000 Leuven, Belgium
| | - Dragana Stojmenovska
- Department of Sociology, University of Amsterdam, 1001 Amsterdam, The Netherlands
| | - Nora Storz
- Interdisciplinary Social Science, Utrecht University, 3584 Utrecht, The Netherlands
| | - Erich Striessnig
- Department of Demography, University of Vienna, 1010 Vienna, Austria
| | - Anne-Kathrin Stroppe
- Survey Data Curation, Leibniz Institute for the Social Sciences (GESIS), 50667 Cologne, Germany
| | - Janna Teltemann
- Institute for Social Sciences, University of Hildesheim, 31141 Hildesheim, Germany
| | - Andrey Tibajev
- Division of Migration, Ethnicity and Society (REMESO), Linköping University, 60174 Linköping, Sweden
| | - Brian Tung
- Department of Sociology, Washington University in St. Louis, St. Louis, MO 63130
| | - Giacomo Vagni
- Social Research Institute, Institute of Education, University College London, London, WC1H 0AL, United Kingdom
| | - Jasper Van Assche
- Department of Developmental, Personality and Social Psychology, Ghent University, 9000 Ghent, Belgium
- Center for Social and Cultural Psychology, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - Meta van der Linden
- Interdisciplinary Social Science, Utrecht University, 3584 Utrecht, The Netherlands
| | | | - Arno Van Hootegem
- Department of Sociology, Center for Sociological Research, KU Leuven, 3000 Leuven, Belgium
| | - Stefan Vogtenhuber
- Education and Employment, Institute for Advanced Studies, University of Vienna, Vienna, 1080 Austria
| | - Bogdan Voicu
- Research Institute for Quality of Life, Romanian Academy, 010071 Bucharest, Romania
- Department of Sociology, Lucian Blaga University of Sibiu, 550024 Sibiu, Romania
| | - Fieke Wagemans
- Netherlands Institute for Social Research, 2500 BD The Hague, the Netherlands
- Policy Perspectives, Citizen Perspectives, and Behaviors, Netherlands Institute for Social Research, 2594 The Hague, The Netherlands
| | - Nadja Wehl
- Research Cluster "The Politics of Inequality", University of Konstanz, 78464 Konstanz, Germany
| | - Hannah Werner
- Center for Political Science Research, KU Leuven, 3000 Leuven, Belgium
| | | | - Fabian Winter
- Mechanisms of Normative Change, Max Planck Institute for Research on Collective Goods, 53113 Bonn, Germany
| | - Christof Wolf
- Mannheim Centre for European Social Research, University of Mannheim, 68131 Mannheim, Germany
- School of Social Sciences, University of Mannheim, 68159 Mannheim, Germany
- President, Leibniz Institute for the Social Sciences (GESIS), 68159 Mannheim, Germany
| | - Yuki Yamada
- Faculty of Arts and Science, Kyushu University, Fukuoka, 819-0395, Japan
| | - Nan Zhang
- Mannheim Centre for European Social Research, University of Mannheim, 68131 Mannheim, Germany
| | - Conrad Ziller
- Institute for Socio-Economics, University of Duisburg-Essen, 47057 Duisburg, Germany
- Department of Political Science, University of Duisburg-Essen, 47057 Duisburg, Germany
| | - Stefan Zins
- Institute for Employment Research, Federal Employment Agency, 90478 Nuremberg, Germany
| | - Tomasz Żółtak
- Department of Research on Social and Institutional Transformations, Institute of Political Studies of the Polish Academy of Sciences, 00-625 Warsaw, Poland
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Bjørnestad EØ, Olset H, Dhar I, Løland K, Pedersen EKR, Svingen GFT, Svardal A, Berge RK, Ueland PM, Tell GS, Nilsen DWT, Nordrehaug JE, Nygaard E, Nygård O. Circulating trimethyllysine and risk of acute myocardial infarction in patients with suspected stable coronary heart disease. J Intern Med 2020; 288:446-456. [PMID: 32270523 DOI: 10.1111/joim.13067] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 12/20/2022]
Abstract
BACKGROUND The carnitine precursor trimethyllysine (TML) is associated with progression of atherosclerosis, possibly through a relationship with trimethylamine-N-oxide (TMAO). Riboflavin is a cofactor in TMAO synthesis. We examined prospective relationships of circulating TML and TMAO with acute myocardial infarction (AMI) and potential effect modifications by riboflavin status. METHODS By Cox modelling, risk associations were examined amongst 4098 patients (71.8% men) with suspected stable angina pectoris. Subgroup analyses were performed according to median plasma riboflavin. RESULTS During a median follow-up of 4.9 years, 336 (8.2%) patients experienced an AMI. The age- and sex-adjusted hazard ratio (HR) (95% CI) comparing the 4th vs. 1st TML quartile was 2.19 (1.56-3.09). Multivariable adjustment for traditional cardiovascular risk factors and indices of renal function only slightly attenuated the risk estimates [HR (95% CI) 1.79 (1.23-2.59)], which were particularly strong amongst patients with riboflavin levels above the median (Pint = 0.035). Plasma TML and TMAO were strongly correlated (rs = 0.41; P < 0.001); however, plasma TMAO was not associated with AMI risk in adjusted analyses [HR (95% CI) 0.81 (0.58-1.14)]. No interaction between TML and TMAO was observed. CONCLUSION Amongst patients with suspected stable angina pectoris, plasma TML, but not TMAO, independently predicted risk of AMI. Our results motivate further research on metabolic processes determining TML levels and their potential associations with cardiovascular disease. We did not adjust for multiple comparisons, and the subgroup analyses should be interpreted with caution.
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Affiliation(s)
- E Ø Bjørnestad
- From the, Departments of, Department of, Medicine, Stavanger University Hospital, Stavanger, Norway
| | - H Olset
- Department of, Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - I Dhar
- Department of, Clinical Science, University of Bergen, Bergen, Norway
| | - K Løland
- Department of, Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - E K R Pedersen
- Department of, Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - G F T Svingen
- Department of, Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - A Svardal
- Department of, Clinical Science, University of Bergen, Bergen, Norway
| | - R K Berge
- Department of, Heart Disease, Haukeland University Hospital, Bergen, Norway.,Department of, Clinical Science, University of Bergen, Bergen, Norway
| | - P M Ueland
- Department of, Clinical Science, University of Bergen, Bergen, Norway
| | - G S Tell
- Department of, Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - D W T Nilsen
- Department of, Clinical Science, University of Bergen, Bergen, Norway.,Department of, Cardiology, Stavanger University Hospital, Stavanger, Norway
| | - J E Nordrehaug
- Department of, Clinical Science, University of Bergen, Bergen, Norway
| | - E Nygaard
- Department of, Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - O Nygård
- Department of, Heart Disease, Haukeland University Hospital, Bergen, Norway.,Department of, Clinical Science, University of Bergen, Bergen, Norway
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5
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Nygård O, Behtoui A. Access to Social Capital and Educational Returns for Children of Immigrants: Evidence from Three Swedish Studies. Nordic Journal of Migration Research 2020. [DOI: 10.33134/njmr.248] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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6
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Borowczyk K, Piechocka J, Głowacki R, Dhar I, Midtun Ø, Tell GS, Ueland PM, Nygård O, Jakubowski H. Urinary excretion of homocysteine thiolactone and the risk of acute myocardial infarction in coronary artery disease patients: the WENBIT trial. J Intern Med 2019; 285:232-244. [PMID: 30193001 PMCID: PMC6378604 DOI: 10.1111/joim.12834] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES No individual homocysteine (Hcy) metabolite has been studied as a risk marker for coronary artery disease (CAD). Our objective was to examine Hcy-thiolactone, a chemically reactive metabolite generated by methionyl-tRNA synthetase and cleared by the kidney, as a risk predictor of incident acute myocardial infarction (AMI) in the Western Norway B-Vitamin Intervention Trial. DESIGN Single centre, prospective double-blind clinical intervention study, randomized in a 2 × 2 factorial design. SUBJECTS AND METHODS Patients with suspected CAD (n = 2049, 69.8% men; 61.2-year-old) were randomized to groups receiving daily (i) folic acid (0.8 mg)/vitamin B12 (0.4 mg)/vitamin B6 (40 mg); (ii) folic acid/vitamin B12 ; (iii) vitamin B6 or (iv) placebo. Urinary Hcy-thiolactone was quantified at baseline, 12 and 38 months. RESULTS Baseline urinary Hcy-thiolactone/creatinine was significantly associated with plasma tHcy, ApoA1, glomerular filtration rate, potassium and pyridoxal 5'-phosphate (positively) and with age, hypertension, smoking, urinary creatinine, plasma bilirubin and kynurenine (negatively). During median 4.7-years, 183 patients (8.9%) suffered an AMI. In Cox regression analysis, Hcy-thiolactone/creatinine was associated with AMI risk (hazard ratio = 1.58, 95% confidence interval = 1.10-2.26, P = 0.012 for trend; adjusted for age, gender, tHcy). This association was confined to patients with pyridoxic acid below median (adjusted HR = 2.72, 95% CI = 1.47-5.03, P = 0.0001; Pinteraction = 0.020). B-vitamin/folate treatments did not affect Hcy-thiolactone/creatinine and its AMI risk association. CONCLUSIONS Hcy-thiolactone/creatinine ratio is a novel AMI risk predictor in patients with suspected CAD, independent of traditional risk factors and tHcy, but modified by vitamin B6 catabolism. These findings lend a support to the hypothesis that Hcy-thiolactone is mechanistically involved in cardiovascular disease.
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Affiliation(s)
- K Borowczyk
- Department of Microbiology, Biochemistry and Molecular Genetics, Rutgers-New Jersey Medical School, International Center for Public Health, Newark, NJ, USA.,Department of Environmental Chemistry, Faculty of Chemistry, University of Łódź, Łódź, Poland
| | - J Piechocka
- Department of Environmental Chemistry, Faculty of Chemistry, University of Łódź, Łódź, Poland
| | - R Głowacki
- Department of Environmental Chemistry, Faculty of Chemistry, University of Łódź, Łódź, Poland
| | - I Dhar
- Department of Clinical Science, University of Bergen, Bergen, Norway
| | | | - G S Tell
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,Division of Mental and Physical Health, Norwegian Institute of Public Health, Bergen, Norway
| | - P M Ueland
- Department of Clinical Science, University of Bergen, Bergen, Norway
| | - O Nygård
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Heart Disease, Haukeland University Hospital, Institute of Medicine, University of Bergen, Bergen, Norway
| | - H Jakubowski
- Department of Microbiology, Biochemistry and Molecular Genetics, Rutgers-New Jersey Medical School, International Center for Public Health, Newark, NJ, USA.,Department of Biochemistry and Biotechnology, Poznań University of Life Sciences, Poznań, Poland
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7
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Puaschitz NG, Assmus J, Strand E, Karlsson T, Vinknes KJ, Lysne V, Drevon CA, Tell GS, Dierkes J, Nygård O. Adherence to the Healthy Nordic Food Index and the incidence of acute myocardial infarction and mortality among patients with stable angina pectoris. J Hum Nutr Diet 2018; 32:86-97. [PMID: 30091209 DOI: 10.1111/jhn.12592] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND The Healthy Nordic Food Index (HNFI) has been associated with beneficial effects on markers of cardiovascular disease (CVD). Whether such effects are present among patients with established coronary heart disease is unknown. In the present study, we investigated the association between adherence to the HNFI and the risk of acute myocardial infarction (AMI) (fatal or nonfatal) and death among patients with stable angina pectoris. METHODS In the Western Norway B-vitamin Intervention Trial, participants completed a 169-item semi-quantitative food frequency questionnaire. The HNFI was calculated from six food groups (fish, cabbage, apples/pears, root vegetables, whole grain bread and oatmeal), scoring 0-6. Three adherence groups were defined: 0-1 points (low), 2-3 points (medium) or 4-6 points (high). Cox regression analyses investigated associations between adherence to the HNFI and outcomes. RESULTS Among 2019 men (79.7%) and women with mean age of 61.7 years, 307 patients experienced an AMI event during a median (25th and 75th percentiles) follow-up of 7.5 (6.3 and 8.7) years. Median follow-up for total mortality was 10.5 (9.3 and 11.7) years; 171 patients died from CVD and 380 from any cause. No association between HNFI and the risk of AMI was detected. However, the HNFI was associated with a reduced risk of all-cause death, both by linear estimates [hazard ratio (95% confidence interval = 0.91 (0.84-0.98)] and by comparison of the highest with the lowest adherence group [hazard ratio (95% confidence interval = 0.70 (0.52-0.95)]. CONCLUSIONS The results of the present study suggest that a Healthy Nordic diet may reduce mortality in patients with established CVD.
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Affiliation(s)
- N G Puaschitz
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway.,Department of Clinical Science, University of Bergen, Bergen, Norway
| | - J Assmus
- Department of Research and Development, Haukeland University Hospital, Bergen, Norway
| | - E Strand
- Department of Clinical Science, University of Bergen, Bergen, Norway
| | - T Karlsson
- Department of Clinical Science, University of Bergen, Bergen, Norway
| | - K J Vinknes
- Department of Nutrition, Faculty of Medicine, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - V Lysne
- Department of Clinical Science, University of Bergen, Bergen, Norway
| | - C A Drevon
- Department of Nutrition, Faculty of Medicine, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - G S Tell
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,Division of Mental and Physical Health, Department of Non-Communicable Diseases, Norwegian Institute of Public Health, Oslo, Norway
| | - J Dierkes
- Department of Clinical Science, University of Bergen, Bergen, Norway
| | - O Nygård
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway.,KG Jebsen Centre for Diabetes Research, Department of Clinical Science, University of Bergen, Bergen, Norway
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8
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Zuo H, Nygård O, Ueland PM, Vollset SE, Svingen GFT, Pedersen ER, Midttun Ø, Meyer K, Nordrehaug JE, Nilsen DWT, Tell GS. Association of plasma neopterin with risk of an inpatient hospital diagnosis of atrial fibrillation: results from two prospective cohort studies. J Intern Med 2018; 283:578-587. [PMID: 29573355 DOI: 10.1111/joim.12748] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 12/25/2022]
Abstract
BACKGROUND Link between inflammation and atrial fibrillation (AF) has been increasingly recognized. Neopterin, a biomarker of cellular immune activation, may be associated with incident AF. OBJECTIVE To investigate the association between plasma neopterin levels and risk of an inpatient hospital diagnosis of AF, and to evaluate a joint association of neopterin and a nonspecific inflammatory marker C-reactive protein (CRP) in two prospective cohorts. METHODS We performed a prospective analysis from a community-based cohort (the Hordaland Health Study (HUSK), n = 6891), and validated the findings in a cohort of patients with suspected stable angina pectoris (the Western Norway Coronary Angiography Cohort (WECAC), n = 2022). RESULTS In both cohorts, higher plasma levels of neopterin were associated with an increased risk of incident AF after adjustment for age, sex, body mass index, current smoking, diabetes, hypertension and renal function. The multivariable-adjusted hazard ratio (HR) (95% CI) per one SD increment of log-transformed neopterin was 1.20 (1.10-1.32) in HUSK and 1.26 (1.09-1.44) in WECAC. Additional adjustment for CRP did not materially affect the risk association for neopterin. The highest risk of AF was found among individuals with both neopterin and CRP levels above the median (HR: 1.54; 95% CI: 1.16-2.05 in HUSK and HR: 1.67; 95% CI: 1.11-2.52 in WECAC). CONCLUSIONS Our findings indicate an association of plasma neopterin with risk of an inpatient hospital diagnosis of AF, which remains after adjustment for traditional risk factors as well as for CRP. This study highlights a role of cellular immune activation, in addition to inflammation, in AF pathogenesis.
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Affiliation(s)
- H Zuo
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - O Nygård
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - P M Ueland
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Laboratory of Clinical Biochemistry, Haukeland University Hospital, Bergen, Norway
| | - S E Vollset
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,The Norwegian Institute of Public Health, Bergen, Norway
| | - G F T Svingen
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - E R Pedersen
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | | | | | - J E Nordrehaug
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Cardiology, Stavanger University Hospital, Stavanger, Norway
| | - D W T Nilsen
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Cardiology, Stavanger University Hospital, Stavanger, Norway
| | - G S Tell
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,Department of Non-communicable Diseases, Norwegian Institute of Public Health, Bergen, Norway
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9
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Zuo H, Nygård O, Vollset SE, Ueland PM, Ulvik A, Midttun Ø, Meyer K, Igland J, Sulo G, Tell GS. Smoking, plasma cotinine and risk of atrial fibrillation: the Hordaland Health Study. J Intern Med 2018; 283:73-82. [PMID: 28940460 DOI: 10.1111/joim.12689] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 11/29/2022]
Abstract
BACKGROUND Cigarette smoking has been identified as a major modifiable risk factor for coronary heart disease and mortality. However, findings on the relationship between smoking and atrial fibrillation (AF) have been inconsistent. Furthermore, findings from previous studies were based on self-reported smoking. OBJECTIVE To examine the associations of smoking status and plasma cotinine levels, a marker of nicotine exposure, with risk of incident AF in the Hordaland Health Study. METHODS We conducted a prospective analysis of 6682 adults aged 46-74 years without known AF at baseline. Participants were followed via linkage to the Cardiovascular Disease in Norway (CVDNOR) project and the Cause of Death Registry. Smoking status was assessed by both questionnaire and plasma cotinine levels. RESULTS A total of 538 participants developed AF over a median follow-up period of 11 years. Using questionnaire data, current smoking (HR: 1.41, 95% CI: 1.09-1.83), but not former smoking (HR: 1.03, 95% CI: 0.83-1.28), was associated with an increased risk of AF after adjustment for gender, age, body mass index, hypertension, physical activity and education. Using plasma cotinine only, the adjusted HR (95% CI) was 1.40 (1.12-1.75) for participants with cotinine ≥85 nmol L-1 compared to those with cotinine <85 nmol L-1 . However, the risk increased with elevated plasma cotinine levels until 1199 nmol L-1 (HR: 1.55, 95% CI: 1.16-2.05 at the third group vs. the reference group) and plateaued at higher levels. CONCLUSIONS Current, but not former smokers, had a higher risk of developing AF. Use of plasma cotinine measurement corroborated this finding.
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Affiliation(s)
- H Zuo
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - O Nygård
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - S E Vollset
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,The Norwegian Institute of Public Health, Bergen, Norway
| | - P M Ueland
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Laboratory of Clinical Biochemistry, Haukeland University Hospital, Bergen, Norway
| | | | | | | | - J Igland
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - G Sulo
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - G S Tell
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,Domain for Health Data and Digitalization, Norwegian Institute of Public Health, Bergen, Norway
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10
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Nygård O. Early tracking and immigrant optimism: a comparative study of educational aspirations among students in disadvantaged schools in Sweden and the Netherlands. Comp Migr Stud 2017; 5:20. [PMID: 29264232 PMCID: PMC5730635 DOI: 10.1186/s40878-017-0063-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 10/28/2017] [Indexed: 06/07/2023]
Abstract
Educational tracking affects both the trajectories and the composition of peers that students meet in school. This study compares the effect of significant others on students' educational aspirations within two transition regimes: the more comprehensive Swedish system and the more stratified Dutch. Separating between doxic and habituated aspirations, I hypothesize that (1) aspirations among students in disadvantaged schools will be lower in the Netherlands than in Sweden; (2) the higher educational aspirations of girls and children of immigrants will disappear when significant others are controlled for; and (3) the positive effect of significant others is more marked among Swedish students than among Dutch due to greater student heterogeneity. The data comes from 3202 students in schools with low average grades in Sweden and the Netherlands. Results were in line with the hypothesis with one important exception. There was a marked difference in habituated aspirations but no difference in doxic aspirations between the Dutch and Swedish students. In conclusion, the findings suggest a) that early tracking systems creates a disconnect between students' hopes and what they perceive as likely outcomes, and b) that the phenomenon termed "immigrant optimism" and "ethnic capital" reflects unequal access to social capital.
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Affiliation(s)
- Olav Nygård
- ISV-REMESO, Linköping University, 601 74 Norrköping, Sweden
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11
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Dhar I, Lysne V, Ueland P, McCann A, Nygård O. Plasma methionine is not associated with risk of acute myocardial infarction in patients with suspected stable angina pectoris. Atherosclerosis 2016. [DOI: 10.1016/j.atherosclerosis.2016.07.289] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Karlsson T, Strand E, Drevon C, Dierkes J, Nygård O. SUN-PP002: Fish Intake and Incident Type 2 Diabetes Mellitus in Patients with Coronary Artery Disease. Clin Nutr 2015. [DOI: 10.1016/s0261-5614(15)30153-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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13
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Sulo E, Vollset SE, Nygård O, Sulo G, Igland J, Egeland GM, Ebbing M, Tell GS. Trends in 28-day and 1-year mortality rates in patients hospitalized for a first acute myocardial infarction in Norway during 2001-2009: a "Cardiovascular disease in Norway" (CVDNOR) project. J Intern Med 2015; 277:353-361. [PMID: 24815825 DOI: 10.1111/joim.12266] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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: 11/28/2022]
Abstract
OBJECTIVE The aim of this study was to investigate the trends in 28-day and 1-year mortality rates in patients hospitalized for a first acute myocardial infarction (AMI) in Norway during the period 2001-2009. Potential age group and gender differences in these trends were also examined. DESIGN, SUBJECTS AND SETTING In this retrospective nationwide cohort study, patients hospitalized for a first AMI between 2001 and 2009 were identified in the Cardiovascular Disease in Norway 1994-2009 (CVDNOR) project and followed for 1 year. MAIN OUTCOME MEASURES Trends in 28-day and 1-year mortality [both all-cause and cardiovascular disease (CVD) mortality] were investigated. RESULTS A total of 115,608 patients (60.6% men) were hospitalized for a first AMI during the study period. Mortality at 28 days was reduced annually by 3.8% overall and by 6.7%, 4.1% and 2.6% in patients aged 25-64, 65-84 and ≥85 years, respectively (all Ptrend < 0.001). In addition, 1-year all-cause mortality was reduced annually by 2.0% overall (Ptrend < 0.001) and by 3.7% (Ptrend = 0.02), 2.5% (Ptrend < 0.001) and 1.1% (Ptrend < 0.001) in patients aged 25-64, 65-84 and ≥85 years, respectively. Furthermore, 1-year CVD mortality was reduced overall by 6.2% annually; a reduction was observed in all age groups. Finally, 1-year non-CVD mortality increased annually overall by 3.9% due to an increase in patients aged ≥65 years. CONCLUSION Mortaity at 28 days after the first AMI declinedin Norway between 2001 and 2009 in both men and women and in all age groups. All-cause mortality at 1 year also declined both in men and women due to decreases in CVD mortality rates, whilst non-CVD mortality rates increased amongst patients ≥65 years of age.
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Affiliation(s)
- E Sulo
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - S E Vollset
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,Division of Epidemiology, Norwegian Institute of Public Health, Bergen, Norway
| | - O Nygård
- Section for Cardiology, Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - G Sulo
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - J Igland
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - G M Egeland
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,Department of Health Registries, Norwegian Institute of Public Health, Bergen, Norway
| | - M Ebbing
- Department of Health Registries, Norwegian Institute of Public Health, Bergen, Norway
| | - G S Tell
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,Department of Health Registries, Norwegian Institute of Public Health, Bergen, Norway
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14
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Skeie E, Stand E, Pedersen E, Bjørndal B, Bohov P, Berge R, Ueland P, Midttun O, Drevon C, Nygård O. Effective statin dose and plasma vitamin E are independently and oppositely associated with serum arachidonic acid. Atherosclerosis 2014. [DOI: 10.1016/j.atherosclerosis.2014.05.777] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Strand E, Olsen T, Pedersen E, Svingen G, Schartum-Hansen H, Nilsen D, Svardal A, Nygård O. Serum acylcarnitines and risk of acute myocardial infarction and cardiovascular death in patients with stable angina pectoris. Atherosclerosis 2014. [DOI: 10.1016/j.atherosclerosis.2014.05.461] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Nygård O, Svingen G, Skeie E, Puaschitz N, Strand E, Drevon C, Lysne V, Olsen T, Schartum-Hansen H, Karlsson T, Pedersen E. Total fat intake modifies the association between apolipoprotein B and risk of acute myocardial infarction in patients with stable angina pectoris. Atherosclerosis 2014. [DOI: 10.1016/j.atherosclerosis.2014.05.874] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Rebnord E, Pedersen E, Strand E, Svingen G, Meyer K, Schartum-Hansen H, Løland K, Seifert R, Ueland P, Nilsen D, Nygård O. Glycosylated haemoglobin and long-term prognosis in patients with suspected stable angina pectoris without diabetes. Atherosclerosis 2014. [DOI: 10.1016/j.atherosclerosis.2014.05.215] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Nitter M, Norgård B, de Vogel S, Eussen SJPM, Meyer K, Ulvik A, Ueland PM, Nygård O, Vollset SE, Bjørge T, Tjønneland A, Hansen L, Boutron-Ruault M, Racine A, Cottet V, Kaaks R, Kühn T, Trichopoulou A, Bamia C, Naska A, Grioni S, Palli D, Panico S, Tumino R, Vineis P, Bueno-de-Mesquita HB, van Kranen H, Peeters PH, Weiderpass E, Dorronsoro M, Jakszyn P, Sánchez M, Argüelles M, Huerta JM, Barricarte A, Johansson M, Ljuslinder I, Khaw K, Wareham N, Freisling H, Duarte-Salles T, Stepien M, Gunter MJ, Riboli E. Plasma methionine, choline, betaine, and dimethylglycine in relation to colorectal cancer risk in the European Prospective Investigation into Cancer and Nutrition (EPIC). Ann Oncol 2014; 25:1609-15. [PMID: 24827130 DOI: 10.1093/annonc/mdu185] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [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] [Indexed: 03/25/2024] Open
Abstract
BACKGROUND Disturbances in one carbon metabolism may contribute to carcinogenesis by affecting methylation and synthesis of DNA. Choline and its oxidation product betaine are involved in this metabolism and can serve as alternative methyl group donors when folate status is low. PATIENTS AND METHODS We conducted a case-control study nested within the European Prospective Investigation into Cancer and Nutrition (EPIC), to investigate plasma concentrations of the methyl donors methionine, choline, betaine (trimethylglycine), and dimethylglycine (DMG) in relation to colorectal cancer (CRC) risk. Our study included 1367 incident CRC cases (965 colon and 402 rectum) and 2323 controls matched by gender, age group, and study center. Multivariate-adjusted odds ratios (ORs) and 95% confidence intervals (95% CIs) for CRC risk were estimated by conditional logistic regression, comparing the fifth to the first quintile of plasma concentrations. RESULTS Overall, methionine (OR: 0.79, 95% CI: 0.63-0.99, P-trend = 0.05), choline (OR: 0.77, 95% CI: 0.60-0.99, P-trend = 0.07), and betaine (OR: 0.85, 95% CI: 0.66-1.09, P-trend = 0.06) concentrations were inversely associated with CRC risk of borderline significance. In participants with folate concentration below the median of 11.3 nmol/l, high betaine concentration was associated with reduced CRC risk (OR: 0.71, 95% CI: 0.50-1.00, P-trend = 0.02), which was not observed for those having a higher folate status. Among women, but not men, high choline concentration was associated with decreased CRC risk (OR: 0.62, 95% CI: 0.43-0.88, P-trend = 0.01). Plasma DMG was not associated with CRC risk. CONCLUSIONS Individuals with high plasma concentrations of methionine, choline, and betaine may be at reduced risk of CRC.
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Affiliation(s)
- M Nitter
- Departments of Global Public Health and Primary Care
| | - B Norgård
- Departments of Global Public Health and Primary Care
| | - S de Vogel
- Departments of Global Public Health and Primary Care
| | - S J P M Eussen
- Departments of Global Public Health and Primary Care Clinical Science, Section for Pharmacology, University of Bergen, Bergen, Norway Department of Epidemiology, School for Public Health and Primary Care, CAPHRI, Maastricht University, Maastricht, The Netherlands
| | | | | | - P M Ueland
- Clinical Science, Section for Pharmacology, University of Bergen, Bergen, Norway Laboratory of Clinical Biochemistry, Haukeland University Hospital, Bergen
| | - O Nygård
- Departments of Clinical Science, Section of Cardiology, University of Bergen, Bergen Heart Disease, Haukeland University Hospital, Bergen
| | - S E Vollset
- Departments of Global Public Health and Primary Care Norwegian Institute of Public Health, Bergen, Norway
| | - T Bjørge
- Departments of Global Public Health and Primary Care Norwegian Institute of Public Health, Bergen, Norway
| | - A Tjønneland
- Institute of Cancer Epidemiology, Danish Cancer Society, Copenhagen, Denmark
| | - L Hansen
- Institute of Cancer Epidemiology, Danish Cancer Society, Copenhagen, Denmark
| | - M Boutron-Ruault
- INSERM, Centre for Research in Epidemiology and Population Health (CESP), Nutrition, Hormones and Women's Health Team, Villejuif Paris South University, Villejuif IGR, Villejuif
| | - A Racine
- INSERM, Centre for Research in Epidemiology and Population Health (CESP), Nutrition, Hormones and Women's Health Team, Villejuif Paris South University, Villejuif IGR, Villejuif
| | - V Cottet
- INSERM, Research Centre 'Lipids, Nutrition, Cancer', Dijon, France
| | - R Kaaks
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - T Kühn
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - A Trichopoulou
- Hellenic Health Foundation, Athens WHO Collaborating Center for Food and Nutrition Policies, Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, Athens, Greece
| | - C Bamia
- Hellenic Health Foundation, Athens WHO Collaborating Center for Food and Nutrition Policies, Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, Athens, Greece
| | - A Naska
- Hellenic Health Foundation, Athens WHO Collaborating Center for Food and Nutrition Policies, Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, Athens, Greece
| | - S Grioni
- Epidemiology and Prevention Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milano
| | - D Palli
- Molecular and Nutritional Epidemiology Unit, Cancer Research and Prevention Institute-ISPO, Florence
| | - S Panico
- Dipartimento di Medicina Clinica e Chirurgia, Federico II University, Naples
| | - R Tumino
- Cancer Registry and Histopathology Unit, 'Civile - M.P. Arezzo' Hospital, ASP, Ragusa
| | - P Vineis
- School of Public Health and HuGeF Foundation, Torino, Italy The School of Public Health, Imperial College London, London, UK
| | - H B Bueno-de-Mesquita
- The School of Public Health, Imperial College London, London, UK National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands Department of Gastroenterology and Hepatology
| | - H van Kranen
- National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | - P H Peeters
- The School of Public Health, Imperial College London, London, UK Julius Center for Health Sciences and Primary Care, University Medical Center, Utrecht, The Netherlands
| | - E Weiderpass
- Department of Community Medicine, Faculty of Health Sciences, UIT The Arctic University of Norway, Tromsø Department of Research, Cancer Registry of Norway, Oslo, Norway Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden Department of Genetic Epidemiology, Samfundet Folkhälsan, Helsinki, Finland
| | - M Dorronsoro
- Basque Regional Health Department, Public Health Direction and Biodonostia Research Institute (CIBERESP), San Sebastian
| | - P Jakszyn
- Unit of Nutrition, Environment and Cancer, Cancer Epidemiology Research Program, Catalan Institute of Oncology, Barcelona
| | - M Sánchez
- Andalusian School of Public Health, Granada CIBER de Epidemiología y Salud Pública (CIBERESP), Madrid Instituto de Investigación Biosanitaria de Granada (Granada.ibs), Granada
| | | | - J M Huerta
- CIBER de Epidemiología y Salud Pública (CIBERESP), Madrid Department of Epidemiology, Regional Health Council, Murcia
| | - A Barricarte
- Public Health Institute of Navarra, Pamplona Consortium for Biomedical Research in Epidemiology and Public Health, Madrid, Spain
| | - M Johansson
- Department of Biobank Research, Umeå University, Umeå, Sweden International Agency for Research on Cancer (IARC-WHO), Lyon, France
| | - I Ljuslinder
- Department of Radiation Sciences, Oncology, University of Umeå, Umeå, Sweden
| | - K Khaw
- University of Cambridge School of Clinical Medicine, Cambridge
| | - N Wareham
- MRC Epidemiology Unit, University of Cambridge, Cambridge, UK
| | - H Freisling
- International Agency for Research on Cancer (IARC-WHO), Lyon, France
| | - T Duarte-Salles
- International Agency for Research on Cancer (IARC-WHO), Lyon, France
| | - M Stepien
- International Agency for Research on Cancer (IARC-WHO), Lyon, France
| | - M J Gunter
- The School of Public Health, Imperial College London, London, UK
| | - E Riboli
- The School of Public Health, Imperial College London, London, UK
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19
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Vinknes KJ, Dekker JM, Drevon CA, Refsum H, Nurk E, Nijpels G, Stehouwer CDA, Teerlink T, Tell GS, Nygård O, Vollset SE, Ueland PM, Elshorbagy AK. Plasma sulfur amino acids and stearoyl-CoA desaturase activity in two Caucasian populations. Prostaglandins Leukot Essent Fatty Acids 2013; 89:297-303. [PMID: 24120123 DOI: 10.1016/j.plefa.2013.09.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 09/04/2013] [Accepted: 09/09/2013] [Indexed: 12/29/2022]
Abstract
In rats, dietary restriction of the cysteine precursor methionine suppresses hepatic stearoyl-CoA desaturase (SCD)-1 expression and activity, whereas cysteine supplementation reverses these effects. In 2 independent cohorts: Hordaland Health Study (HUSK; N=2021, aged 71-74y), Norway, and Hoorn study (N=686, aged 50-87y), Netherlands, we examined the cross-sectional associations of plasma sulfur-containing compounds (SCC; methionine, S-adenosylmethionine, S-adenosylhomocysteine, homocysteine, cystathionine, total cysteine (tCys), glutathione and cysteinylglycine) with SCD-16 index (16:1n-7/16:0), estimated from fatty acid profiles of total plasma or serum lipids. Only tCys was consistently associated with SCD-16 index after adjustments for sex and age (HUSK: partial r=0.14; Hoorn: partial r=0.11, P<0.001 for both), and after further adjustments for other SCC, body fat, diet, exercise and plasma lipids (HUSK: partial r=0.07, P=0.004; Hoorn: partial r=0.12, P=0.013). Together with animal data showing an effect of dietary cysteine on SCD1, our results suggest a role for cysteine in SCD1 regulation in humans.
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Affiliation(s)
- K J Vinknes
- Department of Nutrition, Institute of Basic Medical Science, Faculty of Medicine, University of Oslo, Post box 1046 Blindern, 0317 Oslo, Norway.
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20
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Theofylaktopoulou D, Midttun Ø, Ulvik A, Ueland PM, Tell GS, Vollset SE, Nygård O, Eussen SJPM. A community-based study on determinants of circulating markers of cellular immune activation and kynurenines: the Hordaland Health Study. Clin Exp Immunol 2013; 173:121-30. [PMID: 23607723 DOI: 10.1111/cei.12092] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/07/2013] [Indexed: 12/15/2022] Open
Abstract
Circulating neopterin and kynurenine/tryptophan ratio (KTR) increase during inflammation and serve as markers of cellular immune activation, but data are sparse on other determinants of these markers and metabolites of the kynurenine pathway. We measured neopterin, tryptophan, kynurenine, anthranilic acid, kynurenic acid, 3-hydroxykynurenine, 3-hydroxyanthranilic acid and xanthurenic acid in plasma in two age groups, 45-46 years (n = 3723) and 70-72 years (n = 3329). Differences across categories of the potential determinants, including age, gender, renal function, body mass index (BMI), smoking and physical activity, were tested by Mann-Whitney U-test and multiple linear regression including age group, gender, renal function and lifestyle factors. In this multivariate model, neopterin, KTR and most kynurenines were 20-30% higher in the older group, whereas tryptophan was 7% lower. Men had 6-19% higher concentrations of tryptophan and most kynurenines than women of the same age. Compared to the fourth age-specific estimated glomerular filtration rate (eGFR) quartile, the first quartile was associated with higher concentrations of neopterin (25%) and KTR (24%) and 18-36% higher concentrations of kynurenines, except 3-hydroxyanthranilic acid. Additionally, KTR, tryptophan and all kynurenines, except anthranilic acid, were 2-8% higher in overweight and 3-17% higher in obese, than in normal-weight individuals. Heavy smokers had 4-14% lower levels of tryptophan and most kynurenines than non-smokers. Age and renal function were the strongest determinants of plasma neopterin, KTR and most kynurenines. These findings are relevant for the design and interpretation of studies investigating the role of plasma neopterin, KTR and kynurenines in chronic diseases.
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21
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Ebbing M, Bønaa KH, Arnesen E, Ueland PM, Nordrehaug JE, Rasmussen K, Njølstad I, Nilsen DW, Refsum H, Tverdal A, Vollset SE, Schirmer H, Bleie Ø, Steigen T, Midttun Ø, Fredriksen A, Pedersen ER, Nygård O. Combined analyses and extended follow-up of two randomized controlled homocysteine-lowering B-vitamin trials. J Intern Med 2010; 268:367-82. [PMID: 20698927 DOI: 10.1111/j.1365-2796.2010.02259.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES In the Norwegian Vitamin Trial and the Western Norway B Vitamin Intervention Trial, patients were randomly assigned to homocysteine-lowering B-vitamins or no such treatment. We investigated their effects on cardiovascular outcomes in the trial populations combined, during the trials and during an extended follow-up, and performed exploratory analyses to determine the usefulness of homocysteine as a predictor of cardiovascular outcomes. DESIGN Pooling of data from two randomized controlled trials (1998-2005) with extended post-trial observational follow-up until 1 January 2008. SETTING Thirty-six hospitals in Norway. SUBJECTS 6837 patients with ischaemic heart disease. INTERVENTIONS One capsule per day containing folic acid (0.8 mg) plus vitamin B12 (0.4 mg) and vitamin B6 (40 mg), or folic acid plus vitamin B12, or vitamin B6 alone or placebo. MAIN OUTCOME MEASURES Major adverse cardiovascular events (MACEs; cardiovascular death, acute myocardial infarction or stroke) during the trials and cardiovascular mortality during the extended follow-up. RESULTS Folic acid plus vitamin B12 treatment lowered homocysteine levels by 25% but did not influence MACE incidence (hazard ratio, 1.07; 95% CI, 0.95-1.21) during 39 months of follow-up, or cardiovascular mortality (hazard ratio, 1.12; 95% CI, 0.95-1.31) during 78 months of follow-up, when compared to no such treatment. Baseline homocysteine level was not independently associated with study outcomes. However, homocysteine concentration measured after 1-2 months of folic acid plus vitamin B12 treatment was a strong predictor of MACEs. CONCLUSION We found no short- or long-term benefit of folic acid plus vitamin B12 on cardiovascular outcomes in patients with ischaemic heart disease. Our data suggest that cardiovascular risk prediction by plasma total homocysteine concentration may be confined to the homocysteine fraction that does not respond to B-vitamins.
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Affiliation(s)
- M Ebbing
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway.
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Tandberg A, Bjørge T, Nygård O, Børdahl PE, Skjaerven R. Trends in incidence and mortality for triplets in Norway 1967-2006: the influence of assisted reproductive technologies. BJOG 2010; 117:667-75. [DOI: 10.1111/j.1471-0528.2010.02530.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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23
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Abstract
The Hordaland Homocysteine Study is a population-based screening of total plasma homocysteine (tHcy) in approximately 18,000 men and women aged 40-67 yr that took place in 1992-1993 in the county of Hordaland in Western Norway. In this cohort, tHcy was associated with several physiologic and life-style factors, including age and gender, blood pressure, serum cholesterol, smoking, alcohol and coffee consumption, physical activity, diet, and vitamin status. All associations with established cardiovascular risk factors were in the direction expected to confer increased risk. In a subset of 5,883 women aged 40-42 yr, tHcy was associated with previous pregnancy outcomes, including preeclampsia, placental abruption, and neural tube defects. This article reviews the published results from the Hordaland Homocysteine Study in the light of relevant literature. The Hordaland Homocysteine cohort will be used for future investigations of the stability of tHcy and vitamin status over time, and to investigate associations with mortality and morbidity including cancer incidence.
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Affiliation(s)
- P M Ueland
- LOCUS for Homocysteine and Related Vitamins, Armauer Hansens hus, University of Bergen, Norway.
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24
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Sloma MS, Nygård O. Possible interaction sites of mRNA, tRNA, translation factors and the nascent peptide in 5S, 5.8S and 28S rRNA in in vivo assembled eukaryotic ribosomal complexes. Biochim Biophys Acta 2001; 1521:30-8. [PMID: 11690633 DOI: 10.1016/s0167-4781(01)00286-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We have investigated possible interaction sites for mRNA, tRNA, translation factors and the nascent peptide on 5S, 5.8S and 28S rRNA in in vivo assembled translational active mouse ribosomes by comparing the chemical footprinting patterns derived from native polysomes, salt-washed polysomes (mainly lacking translational factors) and salt-washed runoff ribosomes (lacking mRNA, tRNA and translational factors). Several ligand-induced footprints were observed in 28S rRNA while no reactivity changes were seen in 5S and 5.8S rRNA. Footprints derived from mRNA, tRNA and/or the nascent peptide chain were observed in domain I of 28S rRNA (hairpin 23), in domain II (helix 37/38 and helices 42 and 43 and in the eukaryotic expansion segment 15), in domain IV (helices 67 and 74) and in domain V (helices 94 and 96 and in the peptidyl transferase ring). Some of the protected sites were homologous to sites previously suggested to be involved in mRNA, tRNA and/or peptide binding in in vitro assembled prokaryotic complexes. Additional footprints were located in regions that have not previously been found involved in ligand binding. Part of these sites could derive from the nascent peptide in the exit channel of the ribosome.
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MESH Headings
- Animals
- Binding Sites
- CME-Carbodiimide/analogs & derivatives
- Eukaryotic Cells/chemistry
- Eukaryotic Cells/metabolism
- Ligands
- Liver/chemistry
- Liver/metabolism
- Mice
- Peptide Initiation Factors/chemistry
- Polyribosomes/chemistry
- Polyribosomes/metabolism
- Protein Structure, Secondary
- Protein Structure, Tertiary
- RNA, Messenger/chemistry
- RNA, Ribosomal, 28S/chemistry
- RNA, Ribosomal, 5.8S/chemistry
- RNA, Ribosomal, 5S/chemistry
- RNA, Transfer/chemistry
- Sulfuric Acid Esters
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Affiliation(s)
- M S Sloma
- Natural Science Section, Södertörns högskola, Huddinge, Sweden
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25
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Nedrebø BG, Nygård O, Ueland PM, Lien EA. Plasma total homocysteine in hyper- and hypothyroid patients before and during 12 months of treatment. Clin Chem 2001; 47:1738-41. [PMID: 11514424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- B G Nedrebø
- LOCUS for Homocysteine and Related Vitamins, University of Bergen, 5021 Bergen, Norway.
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26
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Vollset SE, Refsum H, Tverdal A, Nygård O, Nordrehaug JE, Tell GS, Ueland PM. Plasma total homocysteine and cardiovascular and noncardiovascular mortality: the Hordaland Homocysteine Study. Am J Clin Nutr 2001; 74:130-6. [PMID: 11451728 DOI: 10.1093/ajcn/74.1.130] [Citation(s) in RCA: 135] [Impact Index Per Article: 5.9] [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: 11/13/2022] Open
Abstract
BACKGROUND Few population-based studies have assessed relations between plasma or serum total homocysteine (tHcy) and all-cause mortality. OBJECTIVE Our goal was to study associations between plasma tHcy and all-cause, cardiovascular, and noncardiovascular mortality. DESIGN This was a prospective cohort study of 2127 men and 2639 women aged 65-67 y in 1992-1993 when they were recruited as part of a population-based national cardiovascular screening program carried out in Hordaland County, Norway. RESULTS During a median of 4.1 y of follow-up, 162 men and 97 women died. A strong relation was found between plasma tHcy and all-cause mortality. The association was highly significant for noncardiovascular and for cardiovascular causes of death. In a comparison of individuals having tHcy concentrations of 9.0-11.9, 12.0-14.9, 15.0-19.9, or > or = 20 micromol/L with individuals having a tHcy concentration < 9 micromol/L, adjusted mortality ratios were 1.4, 1.9, 2.3, and 3.6 (P for trend = 0.0002) for noncardiovascular and 1.3, 2.1, 2.6, and 3.5 (P for trend = 0.0002) for cardiovascular causes of death. A tHcy increment of 5 micromol/L was associated with a 49% (95% CI: 28%, 72%) increase in all-cause mortality, a 50% (95% CI: 21%, 85%) increase in cardiovascular mortality (121 deaths), a 26% (95% CI: -2%, 63%) increase in cancer mortality (103 deaths), and a 104% (95% CI: 44%, 289%) increase in noncancer, noncardiovascular mortality (33 deaths). CONCLUSION Plasma tHcy is a strong predictor of both cardiovascular and noncardiovascular mortality in a general population of 65-72-y-olds. These results should encourage studies of tHcy in a wider perspective than one confined to cardiovascular disease.
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Affiliation(s)
- S E Vollset
- Locus for Homocysteine and Related Vitamins, University of Bergen, Bergen, Norway.
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27
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Abstract
During protein synthesis the ribosome interacts with ligands such as mRNA, tRNA and translation factors. We have studied the effect of ribosome-ligand interaction on the accessibility of 18S rRNA for single strand-specific modification in ribosomal complexes that have been assembled in vivo, i. e. native polysomes. A comparison of the modification patterns derived from programmed and non-programmed ribosomes showed that bases in the 630- and 1060-loops (530- and 790-loops in E. coli) together with two nucleotides in helices 33 and 34 were protected from chemical modification. The majority of the protected sites were homologous to sites previously suggested to be involved in mRNA and/or tRNA binding in prokaryotes and eukaryotes, implying that the interaction sites for these ligands are similar, if not identical, in naturally occurring programmed ribosomes and in in vitro assembled ribosomal complexes. Additional differences between programmed and non-programmed ribosomes were found in hairpin 8. The bases in helix 8 showed increased exposure to chemical modification in the programmed ribosomes. In addition, structural differences in helices 36 and 37 were observed between native 80S run-off ribosomes and 80S ribosomes assembled from isolated 40S and 60S subunits.
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Affiliation(s)
- M S Sloma
- Department of Zoological Cell Biology, Arrhenius Laboratories, University of Stockholm, Sweden
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28
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Nurk E, Tell GS, Nygård O, Refsum H, Ueland PM, Vollset SE. Plasma total homocysteine is influenced by prandial status in humans: the Hordaland Hhomocysteine Sstudy. J Nutr 2001; 131:1214-6. [PMID: 11285329 DOI: 10.1093/jn/131.4.1214] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Plasma total homocysteine (tHcy) is a risk factor for cardiovascular disease, adverse pregnancy outcomes and impaired cognitive function. No population-based studies on the possible influence of prandial status on tHcy have been published. The aim of this study was to investigate the variation in plasma tHcy levels in relation to time since last meal. A cross-sectional, population-based study including 18,044 individuals in Western Norway was conducted. Most subjects were in the age groups 40-42 and 65-67 y. Participants who had not eaten during the past 6 h before the blood sampling had significantly higher mean tHcy levels compared with those who had eaten; 11.7 [95% confidence interval (CI): 11.4-12.1] vs. 11.2 (95% CI: 11.1-11.3) micromol/L among men (P = 0.03) and 10.2 (95% CI: 9.9-10.6) vs. 9.7 (95% CI: 9.6-9.7) micromol/L among women (P = 0.003). In all groups except older women, tHcy concentrations were generally higher with increasing time after a meal (P-trend <0.01 in all 3 groups). These findings suggest that fasting status and time since last meal may influence levels of tHcy and should be considered in studies of tHcy as a risk factor for cardiovascular and other diseases, and when comparing tHcy values among studies.
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Affiliation(s)
- E Nurk
- Department of Public Health and Primary Health Care, University of Bergen, N-5021 Bergen, Norway.
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29
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Abstract
The expansion segments in eukaryotic ribosomal RNAs are additional RNA sequences not found in the RNA core common to both prokaryotes and eukaryotes. These regions show large species-dependent variations in sequence and size. This makes it difficult to create secondary structure models for the expansion segments exclusively based on phylogenetic sequence comparison. Here we have used a combination of experimental data and computational methods to generate secondary structure models for expansion segment 15 in 28S rRNA in mice, rats, and rabbits. The experimental data were collected using the structure sensitive reagents DMS, CMCT, kethoxal, micrococcal nuclease, RNase T(1), RNase CL3, RNase V(1), and lead(II) acetate. ES15 was folded with the computer program RNAStructure 3.5 using modification data and phylogenetic similarities between different ES15 sequences. This program uses energy minimization to find the most stable secondary structure of an RNA sequence. The presented secondary structure models include several common structural motifs, but they also have characteristics unique to each organism. Overall, the secondary structure models showed indications of an energetically stable but dynamic structure, easily accessible from the solution by the modification reagents, suggesting that the expansion segment is located on the ribosomal surface.
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Affiliation(s)
- S L Larsson
- Natural Science Section, Södertörn University College, S-141 04 Huddinge, Sweden, and Department of Zoological Cell Biology, Arrhenius Laboratories E5, Stockholm University, S-106 91 Stockholm, Sweden
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30
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Abstract
Reticulocyte lysates contain ribosome-bound and free populations of 5S RNA. The free population is sensitive to nuclease cleavage in the internal loop B, at the phosphodiester bond connecting nucleotides A54 and A55. Similar cleavage sites were detected in 5S rRNA in 60S subunits and 80S ribosomes. However, 5S rRNA in reticulocyte polysomes is insensitive to cleavage unless ribosomes are salt-washed. This suggests that a translational factor protects the backbone surrounding A54 from cleavage in polysomes. Upon nuclease treatment of mouse 60S subunits or reticulocyte lysates a small population of ribosomes released its 5S rRNA together with ribosomal protein L5. Furthermore, rRNA sequences from 5.8S, 28S and 18S rRNA were released. In 18S rRNA the sequences mainly originate from the 630 loop and stem (helix 18) in the 5' domain, whereas in 28S rRNA a majority of fragments is derived from helices 47 and 81 in domains III and V, respectively. We speculate that this type of rRNA-fragmentation may mimic a ribosome degradation pathway.
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Affiliation(s)
- L Holmberg
- Södertörns Högskola, Natural Science Section, Huddinge, Sweden
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31
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Abstract
Hypothyroidism is associated with increased cardiovascular morbidity, which cannot be fully explained by the atherogenic lipid profile observed in these patients. We have previously found elevated levels of the cardiovascular risk factor, plasma total homocysteine (tHcy), in hypothyroidism. We conducted a longitudinal study on 17 patients who had undergone total thyroidectomy for thyroid cancer. During 6 weeks of discontinued T4 substitution before radioscintigraphy (phase I), they attained a hypothyroid state, which was reversed by resupplementation (phase II). Plasma tHcy, serum creatinine, serum and red blood cell folate, serum cobalamin, and serum cholesterol were determined at 2-week intervals throughout phases I and II. There was a progressive and parallel increase in tHcy (mean, 27%), serum creatinine (37%), and serum cholesterol (100%) during phase I, and these values returned to the original level within 4-6 weeks after reinitiating T4 therapy. Serum and red blood cell folate levels showed only minor, but statistically significant, changes. In a bivariate model, serum creatinine and serum cholesterol were strongly associated with the changes observed in tHcy during short term hypothyroidism. In conclusion, we found a transient increase in both plasma tHcy and serum cholesterol during short term iatrogenic hypothyroidism, and the tHcy response is probably mainly explained by concurrent changes in renal function. The increase in both plasma tHcy and serum cholesterol may confer increased cardiovascular risk in hypothyroid patients.
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Affiliation(s)
- E A Lien
- Division of Pharmacology, University Hospital of Bergen, Norway.
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32
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El-Khairy L, Ueland PM, Nygård O, Refsum H, Vollset SE. Lifestyle and cardiovascular disease risk factors as determinants of total cysteine in plasma: the Hordaland Homocysteine Study. Am J Clin Nutr 1999; 70:1016-24. [PMID: 10584046 DOI: 10.1093/ajcn/70.6.1016] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Plasma total homocysteine (tHcy) is a cardiovascular disease risk factor and is related to several components of the established cardiovascular disease risk profile. Cysteine is structurally and metabolically related to homocysteine, but data on its association with cardiovascular disease and cardiovascular disease risk factors are sparse. OBJECTIVE Our objective was to search for the determinants of plasma total cysteine (tCys) and compare them with those of tHcy. DESIGN In this cross-sectional study, we studied 7591 healthy men and 8585 healthy women aged 40-67 y with no history of hypertension, diabetes mellitus, coronary heart disease, or cerebrovascular disease. RESULTS In the group aged 40-42 y, tCys was significantly higher in men (&mean;: 273 micromol/L; 2.5-97.5 percentile: 219-338 micromol/L) than in women (253 micromol/L; 202-317 micromol/L) (P < 0.001). In the group aged 65-67 y, there was no significant sex difference in tCys: men (296 micromol/L; 233-362 micromol/L) and women (296 micromol/L; 234-361 micromol/L). As with tHcy, tCys was positively associated with age, total cholesterol concentration, diastolic blood pressure, and coffee consumption. Body mass index was a strong determinant of tCys but was not related to tHcy. Several factors known to influence tHcy, including smoking status, folate and vitamin intake, heart rate, and physical activity, were not associated or were only weakly associated with tCys. CONCLUSION Plasma tCys is strongly related to several factors that constitute the cardiovascular disease risk profile. This should be an incentive to determine the role of tCys in cardiovascular disease.
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Affiliation(s)
- L El-Khairy
- Department of Public Health and Primary Health Care and the Department of Pharmacology, University of Bergen, Norway.
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33
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Abstract
Recent data have shown that an elevated plasma level of the amino acid homocysteine (Hcy) is a common, independent, easily modifiable and possibly causal risk factor for cardiovascular disease (CVD) which may be of equal importance to hypercholesterolemia, hypertension and smoking. This paper reviews the biochemical, clinical, epidemiological and experimental data underlying this conclusion and is critically questioning whether elevated tHcy is a causal factor.
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Affiliation(s)
- O Nygård
- Division for Medical Statistics, Department of Public Health, University of Bergen, Norway, Sweden.
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34
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Abstract
An elevated level of total homocysteine (tHcy) in blood, denoted hyperhomocysteinemia, is emerging as a prevalent and strong risk factor for atherosclerotic vascular disease in the coronary, cerebral, and peripheral vessels, and for arterial and venous thromboembolism. The basis for these conclusions is data from about 80 clinical and epidemiological studies including more than 10,000 patients. Elevated tHcy confers a graded risk with no threshold, is independent of but may enhance the effect of the conventional risk factors, and seems to be a particularly strong predictor of cardiovascular mortality. Hyperhomocysteinemia is attributed to commonly occurring genetic and acquired factors including deficiencies of folate and vitamin B12. Supplementation with B-vitamins, in particular with folic acid, is an efficient, safe, and inexpensive means to reduce an elevated tHcy level. Studies are now in progress to establish whether such therapy will reduce cardiovascular risk.
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Affiliation(s)
- H Refsum
- Department of Pharmacology, University of Bergen, Norway.
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35
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Nygård O, Refsum H, Ueland PM, Vollset SE. Major lifestyle determinants of plasma total homocysteine distribution: the Hordaland Homocysteine Study. Am J Clin Nutr 1998; 67:263-70. [PMID: 9459374 DOI: 10.1093/ajcn/67.2.263] [Citation(s) in RCA: 305] [Impact Index Per Article: 11.7] [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: 02/06/2023] Open
Abstract
We report on the location and skewness of the distribution of plasma total homocysteine (tHcy) according to lifestyle indexes in 11,941 apparently healthy participants of the Hordaland Homocysteine Study. Most subjects were in two age groups: 9165 subjects were aged 40-42 y and 2351 subjects were aged 65-67 y. The remaining 425 subjects were of intermediate ages. In multivariate analysis, sex, age, folate intake, smoking status, and coffee consumption were the strongest determinants of tHcy concentration. The combined effect of the three modifiable factors was larger than the effect from each factor alone. A lifestyle profile characterized by low folate intakes, smoking, and coffee consumption was associated with a high median tHcy concentration and a pronounced skewness toward high tHcy values. In subjects characterized by a contrasting lifestyle profile [high folate intakes, nonsmoking status, and low coffee consumption (< 1 cup/d)], tHcy values were almost normally distributed and the median concentration was 3.0-4.8 micromol/L lower. Among all 40-42-y-old subjects, the 95% reference ranges based on geometric mean tHcy concentrations were 5.1-16.5 micromol/L for women and 6.2-18.7 micromol/L for men. The corresponding ranges for subjects characterized by high folate intakes, nonsmoking status, and low or moderate coffee consumption (< 5 cups/d) were 4.8-12.8 micromol/L and 6.2-14.7 micromol/L. These findings are relevant for establishing adequate reference ranges for tHcy and emphasize folate intake, smoking status, and coffee consumption as major acquired determinants of tHcy concentration in this general population.
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Affiliation(s)
- O Nygård
- Department of Public Health and Primary Health Care, University of Bergen, Norway.
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36
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Abstract
We found a higher plasma concentration of total homocysteine (tHcy), an independent risk factor for cardiovascular disease, in patients with hypothyroidism (mean, 16.3 micromol/L; 95% confidence interval [CI], 14.7 to 17.9 micromol/L) than in healthy controls (mean, 10.5 micromol/L; 95% CI, 10.1 to 10.9 micromol/L). The tHcy level of hyperthyroid patients did not differ significantly from that of the controls. Serum creatinine was higher in hypothyroid patients and lower in hyperthyroid patients than in controls, whereas serum folate was higher in hyperthyroid patients compared with the two other groups. In multivariate analysis, these differences did not explain the higher tHcy concentration in hypothyroidism. We confirmed the observation of elevated serum cholesterol in hypothyroidism, which together with the hyperhomocysteinemia may contribute to an accelerated atherogenesis in these patients.
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Affiliation(s)
- B G Nedrebø
- Department of Internal Medicine, University Hospital of Bergen, Norway
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37
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Nygård O, Refsum H, Ueland P, Nordrehaug J, Vollset S, Farstad M. 2.P.191 Lipoproteins and homocysteine as risk markers for mortality in patients with coronary artery disease (CAD). Atherosclerosis 1997. [DOI: 10.1016/s0021-9150(97)88829-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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38
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Abstract
BACKGROUND Elevated plasma homocysteine levels are a risk factor for coronary heart disease, but the prognostic value of homocysteine levels in patients with established coronary artery disease has not been defined. METHODS We prospectively investigated the relation between plasma total homocysteine levels and mortality among 587 patients with angiographically confirmed coronary artery disease. At the time of angiography in 1991 or 1992, risk factors for coronary disease, including homocysteine levels, were evaluated. The majority of the patients subsequently underwent coronary-artery bypass grafting (318 patients) or percutaneous transluminal coronary angioplasty (120 patients); the remaining 149 were treated medically. RESULTS After a median follow-up of 4.6 years, 64 patients (10.9 percent) had died. We found a strong, graded relation between plasma homocysteine levels and overall mortality. After four years, 3.8 percent of patients with homocysteine levels below 9 micromol per liter had died, as compared with 24.7 percent of those with homocysteine levels of 15 micromol per liter or higher. Homocysteine levels were only weakly related to the extent of coronary artery disease but were strongly related to the history with respect to myocardial infarction, the left ventricular ejection fraction, and the serum creatinine level. The relation of homocysteine levels to mortality remained strong after adjustment for these and other potential confounders. In an analysis in which the patients with homocysteine levels below 9 micromol per liter were used as the reference group, the mortality ratios were 1.9 for patients with homocysteine levels of 9.0 to 14.9 micromol per liter, 2.8 for those with levels of 15.0 to 19.9 micromol per liter, and 4.5 for those with levels of 20.0 micromol per liter or higher (P for trend=0.02). When death due to cardiovascular disease (which occurred in 50 patients) was used as the end point in the analysis, the relation between homocysteine levels and mortality was slightly strengthened. CONCLUSIONS Plasma total homocysteine levels are a strong predictor of mortality in patients with angiographically confirmed coronary artery disease.
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Affiliation(s)
- O Nygård
- Department of Public Health and Primary Health Care, University of Bergen, Haukeland University Hospital, Norway
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39
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Holmberg L, Nygård O. Mapping of nuclease-sensitive sites in native reticulocyte ribosomes--an analysis of the accessibility of ribosomal RNA to enzymatic cleavage. Eur J Biochem 1997; 247:160-8. [PMID: 9249022 DOI: 10.1111/j.1432-1033.1997.00160.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Treatment of ribosomes in reticulocyte lysates with low concentrations of the calcium-dependent nuclease from Staphylococcus aureus resulted in cleavage of rRNA. The positions of the cleaved phosphodiester bonds were localised by primer extension and polyacrylamide gel electrophoresis. S. aureus nuclease-induced strand scissions were found in the 5'-domain of 18S rRNA and in domains II, IV and VI of 28S rRNA. The majority of the cleavage sites were located in eukaryote-specific expansion segments and only one cleavage site was found in a region suggested to be directly involved in ribosomal function. Treatment of the reticulocyte lysate with increasing amounts of S. aureus nuclease resulted in the introduction of new cleavage sites. However, even at the highest nuclease concentration used, large parts of the rRNAs were protected from nuclease digestion. Removal of translational components, by salt wash of isolated reticulocyte polysomes, exposed additional rRNA sequences to S. aureus nuclease cleavage. These sequences were found in the 3'-major domain of 18S rRNA and in domains II, IV, and V of 28S rRNA. These sites are located at the putative translational surface of the ribosome. The translational activity of the S. aureus nuclease-treated ribosomes, determined after addition of exogenous mRNA, was directly correlated to the extent of nuclease digestion of the ribosomes. However, the decrease in translational activity observed in lysates treated with low amounts of S. aureus nuclease was not due to a preferential exclusion of damaged ribosomes from polysome formation. This suggests that the induced cleavages were not detrimental to ribosomal function but could influence the rate of ribosomal movement along the mRNA.
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Affiliation(s)
- L Holmberg
- Department of Zoological Cell Biology, The Wenner-Gren Institute, Stockholm University, Sweden
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40
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Abstract
Embryonic chicken muscle cells (CELM) contain the calmodulin-dependent protein kinase that specifically phosphorylates eukaryotic elongation factor 2. The kinase requires Ca2+ and maximum activity in CELM was observed at 10 microM Ca2+. The ATP concentration required for half the maximum activity of CaM PKIII in CELM was calculated to be 0.15 mM. In CELM, dephosphorylation of eEF-2 was catalyzed by phosphoprotein phosphatase PP2A alone. The activity of PP2A was relatively low and the half-life of added phosphorylated eEF-2 was more than 15 min. Due to the low phosphoprotein phosphatase activity, inhibition of the PP2A activity by addition of okadaic acid had little effect on the eEF-2 phosphorylation kinetics.
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Affiliation(s)
- B Riis
- Department of Zoological Cell Biology, Wenner-Grens Institute, Stockholm University, Sweden.
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41
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Nygård O, Refsum H, Ueland PM, Stensvold I, Nordrehaug JE, Kvåle G, Vollset SE. Coffee consumption and plasma total homocysteine: The Hordaland Homocysteine Study. Am J Clin Nutr 1997; 65:136-43. [PMID: 8988925 DOI: 10.1093/ajcn/65.1.136] [Citation(s) in RCA: 143] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The health consequences of coffee drinking remain controversial. We report on an association between coffee consumption and the concentration of total homocysteine (tHcy) in plasma, a risk factor for cardiovascular disease and for adverse pregnancy outcome. The study population consisted of 7589 men and 8585 women 40-67 y of age and with no history of hypertension, diabetes, ischemic heart disease, or cerebrovascular disease. They were recruited from Hordaland county of western Norway in 1992-1993. Daily use of coffee was reported by 89.1% of the participants, of whom 94.9% used caffeinated filtered coffee. There was a marked positive dose-response relation between coffee consumption and plasma tHcy, which was stronger than the relation between coffee and total serum cholesterol. In 40-42-y-old men, mean tHcy was 10.1 mumol/L for nonusers and 12.0 mumol/L for drinkers of > or = 9 cups of coffee/d. Corresponding tHcy concentrations in 40-42-y-old women were 8.2 and 10.5 mumol/L, respectively. Although coffee drinking was associated with smoking and lower intake of vitamin supplements and fruit and vegetables, the coffee-tHcy association was only moderately reduced after these variables were adjusted for. The combination of cigarette smoking and high coffee intake was associated with particularly high tHcy concentrations. A strong inverse relation between tea and tHcy concentration in univariate analysis was substantially attenuated after smoking and coffee drinking were adjusted for. The results of the present report should promote future studies on tHcy as a possible mediator of adverse clinical effects related to heavy coffee consumption.
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Affiliation(s)
- O Nygård
- Department of Clinical Biology, University of Bergen, Norway.
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42
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Guttormsen AB, Ueland PM, Nesthus I, Nygård O, Schneede J, Vollset SE, Refsum H. Determinants and vitamin responsiveness of intermediate hyperhomocysteinemia (> or = 40 micromol/liter). The Hordaland Homocysteine Study. J Clin Invest 1996; 98:2174-83. [PMID: 8903338 PMCID: PMC507663 DOI: 10.1172/jci119024] [Citation(s) in RCA: 179] [Impact Index Per Article: 6.4] [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: 02/02/2023] Open
Abstract
From 1992-93, we screened 18,043 subjects, aged 40-67 yr, and found 67 cases (0.4%) with total plasma homocysteine (tHcy) > or = 40 micromol/liter. Compared to 329 controls, the cases had lower plasma folate and cobalamin levels, lower intake of vitamin supplements, consumed more coffee, and were more frequently smokers. Homozygosity for the C677T mutation in the methylenetetrahydrofolate reductase gene was observed in 73.1% of the cases and 10.2% of the controls. Only seven cases with cobalamin deficiency and one with homocystinuria received specific therapeutic instructions. 2 yr after the screening, 58 subjects were reinvestigated. 41 still had tHcy > 20 micromol/liter, and in 37 of these, intervention with low dose folic acid (0.2 mg/d) was started. Notably, 34 of 37 (92%) had homozygosity for the C677T mutation. Plasma tHcy was reduced in all but two after 7 wk, and became normal within 7 mo in 21 of 37 subjects. Most of the remaining subjects obtained a normal tHcy level with 5 mg/d of folic acid. We conclude that most subjects with hyperhomocysteinemia > or = 40 micromol/liter in the general population have the C677T mutation combined with low folate status. Daily supplement of low dose folic acid will reduce and often normalize their tHcy level.
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Affiliation(s)
- A B Guttormsen
- Department of Clinical Biology, University of Bergen, Norway
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43
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Holmberg L, Nygård O. Depurination of A4256 in 28 S rRNA by the ribosome-inactivating proteins from barley and ricin results in different ribosome conformations. J Mol Biol 1996; 259:81-94. [PMID: 8648651 DOI: 10.1006/jmbi.1996.0303] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [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: 02/01/2023]
Abstract
Ribosomal function in protein synthesis requires dynamic flexibility of the ribosomal structure. The two translational inhibitors derived from seeds of ricin and barley destroy the dynamic properties of the ribosome by selective depurination of A4256 in the phylogenetically conserved alpha-sarcin/ricin loop of mouse 28 S rRNA. As the alpha-sarcin/ricin loop is involved in binding of elongation factors to the ribosome, depurination blocks the protein synthesis elongation cycle. Depurination by the barley translational inhibitor (BTI) mainly effects eEF-1 alpha related functions, while ricin interferes with the interaction of eEF-2 with the ribosome. Analysis of the ribosomal structure after inhibitor shows that the accessibility of the rRNAs for single-strand-specific chemical modification was altered. Reactivity changes were seen in domains I, II and V of 28 S rRNA and in 5 S rRNA. A majority of the reactivity changes were found in putative functional regions of the rRNAs, such as the regions involved in peptidyltransferase activity, subunit interaction and in the binding of elongation factors. Most of the observed structural changes made the rRNAs less accessible for chemical modification, suggesting that the ribosomal particles became less flexible after inhibitor treatment. Moreover, the modification patterns obtained from the two inhibitor-treated ribosomal particles were only partly overlapping, indicating that the structure of the large ribosomal subunit differed after ricin and BTI treatment. Surprisingly, depurination in the alpha-sarcin/ricin loop of 28 S rRNA also affected the structure of the 3' major domain in 18 S rRNA.
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MESH Headings
- Adenine/chemistry
- Adenine/metabolism
- Animals
- Base Sequence
- DNA Primers
- Hordeum/chemistry
- Magnesium/metabolism
- Magnesium/pharmacology
- Mice
- Models, Molecular
- Molecular Sequence Data
- Nucleic Acid Conformation
- Plant Lectins
- Plant Proteins/pharmacology
- Purines/chemistry
- Purines/metabolism
- RNA, Ribosomal, 18S/chemistry
- RNA, Ribosomal, 18S/drug effects
- RNA, Ribosomal, 18S/metabolism
- RNA, Ribosomal, 28S/chemistry
- RNA, Ribosomal, 28S/drug effects
- RNA, Ribosomal, 28S/metabolism
- RNA, Ribosomal, 5S/chemistry
- RNA, Ribosomal, 5S/drug effects
- RNA, Ribosomal, 5S/metabolism
- Ribosomes/chemistry
- Ribosomes/drug effects
- Ribosomes/metabolism
- Ricin/chemistry
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Affiliation(s)
- L Holmberg
- Department of Zoological Cell Biology, Arrhenius Laboratories E5, Stockholm University, Sweden
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44
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Refsum H, Nygård O, Kvåle G, Ueland PM, Vollset SE. The Hordaland homocysteine study: the opposite tails odds ratios reveal differential effects of gender and intake of vitamin supplements at high and low plasma total homocysteine concentrations. J Nutr 1996; 126:1244S-8S. [PMID: 8642464 DOI: 10.1093/jn/126.suppl_4.1244s] [Citation(s) in RCA: 14] [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: 02/01/2023] Open
Abstract
Both female sex and intake of vitamin supplements are known to be associated with a low mean plasma homocysteine level. In the present study, we used multiple logistic regression analyses to investigate the relation between these two variables and plasma homocysteine at the extreme ends of the plasma homocysteine distribution curve. We propose that the obtained set of odds ratios for hyper- and hypohomocysteinemia, referred to as the opposite tails odds ratios, may be an alternative approach to study determinants of plasma homocysteine.
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Affiliation(s)
- H Refsum
- Department of Clinical Biology, Division of Pharmacology, University of Bergen, Bergen, Norway
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45
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Nygård O, Vollset SE, Refsum H, Stensvold I, Tverdal A, Nordrehaug JE, Ueland M, Kvåle G. Total plasma homocysteine and cardiovascular risk profile. The Hordaland Homocysteine Study. JAMA 1995; 274:1526-33. [PMID: 7474221 DOI: 10.1001/jama.1995.03530190040032] [Citation(s) in RCA: 534] [Impact Index Per Article: 18.4] [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: 01/25/2023]
Abstract
OBJECTIVE To estimate the relations between established cardiovascular risk factors and total homocysteine (tHcy) in plasma. DESIGN Health examination survey by the Norwegian Health Screening Service in 1992 and 1993. SETTING General community, Hordaland County of Western Norway. PARTICIPANTS A total of 7591 men and 8585 women, 40 to 67 years of age, with no history of hypertension, diabetes, coronary heart disease, or cerebrovascular disease were included. MAIN OUTCOME MEASURE Plasma tHcy level. RESULTS The level of plasma tHcy was higher in men than in women and increased with age. In subjects 40 to 42 years old, geometric means were 10.8 mumol/L for 5918 men and 9.1 mumol/L for 6348 women. At age 65 to 67 years, the corresponding tHcy values were 12.3 mumol/L (1386 men) and 11.0 mumol/L (1932 women). Plasma tHcy level increased markedly with the daily number of cigarettes smoked in all age groups. Its relation to smoking was particularly strong in women. The combined effect of age, sex, and smoking was striking. Heavy-smoking men aged 65 to 67 years had a mean tHcy level 4.8 mumol/L higher than never-smoking women aged 40 to 42 years. Plasma tHcy level also was positively related to total cholesterol level, blood pressure, and heart rate and inversely related to physical activity. The relations were not substantially changed by multivariate adjustment, including intake of vitamin supplements, fruits, and vegetables. CONCLUSIONS Elevated plasma tHcy level was associated with major components of the cardiovascular risk profile, ie, male sex, old age, smoking, high blood pressure, elevated cholesterol level, and lack of exercise. These findings should influence future studies on the etiology and pathogenesis of cardiovascular disease.
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Affiliation(s)
- O Nygård
- Section for Medical Informatics and Statistics, University of Bergen, Norway
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46
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Abstract
Ca(2+)-and calmodulin-dependent protein kinase III (CaM PKIII) phosphorylates eukaryotic elongation factor 2 (eEF-2) in HL-60 cells. Dephosphorylation of the factor in these cells is catalyzed by phosphoprotein phosphatase 2A alone. Differentiation of the HL-60 cells by all-trans retinoic acid resulted in a reduced growth rate and a marked decrease in the intracellular concentration of eEF-2. During differentiation the activity of the eEF-2 kinase is gradually reduced and reaches 10% of that found in undifferentiated cells 5 days after the onset of differentiation. The capacity to dephosphorylate phospho-eEF-2 remained unaltered in the growth-arrested cells. Differentiation without reduced proliferation was induced in the HL-60 cells by interferon-gamma. Under these conditions, differentiation had no effect on the cellular content of eEF-2 or the ability to dephosphorylate phospho-eEF-2. However, the differentiated cells showed a dramatic decrease in the specific activity of the eEF-2 kinase. The results show that the cellular content of eEF-2 varies with the rate of proliferation and that the activity of the eEF-2 kinase is high in undifferentiated proliferating cells and decreases upon differentiation even under conditions of an unaltered growth rate.
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Affiliation(s)
- A Nilsson
- Department of Zoological Cell Biology, Arrhenius Laboratories E5, Stockholm University, Sweden
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47
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Riis B, Rattan SI, Palmquist K, Clark BF, Nygård O. Dephosphorylation of the phosphorylated elongation factor-2 in the livers of calorie-restricted and freely-fed rats during ageing. Biochem Mol Biol Int 1995; 35:855-9. [PMID: 7627135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Slowing down of the rate of protein synthesis during ageing is accompanied by alterations in the amounts and activities of elongation factors, eEF-1 and eEF-2. Since the activity of eEF-2 is regulated by phosphorylation, we have determined the changes in the activities of eEF-2-specific phosphorylating and dephosphorylating enzymes during ageing. Previously, we have reported an age-related increase in the activity of eEF-2 kinase (BBRC, 192, 1210, 1993). We have now compared the activities of a dephosphorylating enzyme protein phosphatase 2A (PP2A) in young and old liver extracts from freely-fed or calorie-restricted rats. The activity of PP2A remain unaltered during ageing. Furthermore, there was no change in the kinetics and extent of PP2A-dependent and PP2A-independent dephosphorylation of eEF-2 during ageing.
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Affiliation(s)
- B Riis
- Wenner-Gren Institute, Department of Zoological Cell Biology, Stockholm University, Sweden
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48
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Nilsson A, Nygård O. Effect of oxidizing agents and haemin on the phosphorylation of eukaryotic elongation factor 2 in rabbit reticulocyte lysates. Biochim Biophys Acta 1995; 1260:200-6. [PMID: 7841197 DOI: 10.1016/0167-4781(94)00198-c] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Incubation of rabbit reticulocyte lysates in the absence of added haemin resulted in the phosphorylation of a 95 kDa protein. This protein was suggested to be elongation factor 2 (eEF-2) based on the following observations, (i) phosphorylation of the 95 kDa protein was Ca2+ and CaM-dependent. (ii) eEF-2 supplemented to the lysates became phosphorylated and co-migrated with the endogenous 95 kDa phosphoprotein upon electrophoresis in SDS gels. (iii) The tryptophane specific cleavage pattern obtained from the isolated 95 kDa phosphoprotein was identical to that of phosphorylated eEF-2. Phosphorylation of the 95 kDa protein was stimulated by oxidizing agents such as oxidized glutathione and NAD+ and inhibited by addition of haemin. The haemin concentration needed for 50% inhibition (IC50) was 2.5 microM. Haemin also had an inhibitory effect on eEF-2 phosphorylation in a system containing highly purified components (IC50 = 2 microM). In this system haemin inhibited phosphorylation of eEF-2 even in the presence of a 100-fold excess of beta-mercaptoethanol. Oxidizing agents had no effect on the kinase activity in the purified system.
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Affiliation(s)
- A Nilsson
- Department of Zoological Cell Biology, Arrhenius Laboratories E5, Stockholm University, Sweden
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49
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Abstract
The involvement of ribosomal RNA in the binding of eukaryotic elongation factor eEF-2 to the ribosome was investigated. eEF-2 was complexed to empty reassociated 80S ribosomes in the presence of the nonhydrolyzable GTP analogue GuoPP[CH2]P. The formed complex was treated with dimethyl sulfate, 1-cyclohexyl-3-(2-morpholinoethyl)carbodiimide metho-p-toluenesulfonate, and micrococcus nuclease to allow specific modification at single-stranded regions of the rRNAs. The sites of modification were localized by primer extension using complementary deoxynucleotide primers and reverse transcriptase. The modification pattern was compared to that obtained from 80S ribosomes lacking bound eEF-2. Binding of the factor to the ribosome resulted in the protection of specific sites in both 18S and 28S rRNA, while the reactivity of 5.8S rRNA was unchanged. In 18S rRNA, the affected nucleotides were localized to the 5'- and 3'-domains, and in 28S rRNA the protected nucleotides were seen in domains II, IV, and V. The alpha-sarcin/ricin loop in domain VI of 28S rRNA was inaccessible for chemical modification even in the absence of bound eEF-2. However, the bound factor protected A4256, located in the alpha-sarcin/ricin loop, from ricin-induced depurination.
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Affiliation(s)
- L Holmberg
- Department of Zoological Cell Biology, Arrhenius Laboratories E5, Stockholm University, Sweden
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50
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Abstract
Immunoadsorbents containing the 8D3 anti-heat shock protein 90 monoclonal antibodies were prepared. Partly purified preparations of the Ca2+ and calmodulin dependent eukaryotic elongation factor eEF-2 specific kinase and crude rabbit reticulocyte lysates were mixed with the immunoadsorbent. After removal of unbound proteins the adsorbed material was released by increasing the salt concentration in the buffer. Analysis of the bound material showed that the eEF-2 kinase was bound to the immunoadsorbent together with hsp 90. The adsorption of the kinase was found to depend on the presence of hsp 90.
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Affiliation(s)
- K Palmquist
- Department of Zoological Cell Biology, Arrhenius Laboratories E5, Stockholm University, Sweden
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