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Cage Bedding affects Microbiota and Metabolism in Mice
- András Gregor, Lena Fragner, Slave Trajanoski, Wolfram Weckwerth, Jürgen König, Kalina Duszka
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- Journal:
- Proceedings of the Nutrition Society / Volume 79 / Issue OCE2 / 2020
- Published online by Cambridge University Press:
- 10 June 2020, E414
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The growing problem with the irreproducibility of the results of metabolic research urged us to analyse potential critical factors contributing to the disparities. Microbiota composition constitutes crucial variable in animal research. Gut flora changes depending on multiple factors including fibre intake. Mice derive fibre from diet but, especially under fasted conditions, also from bedding ingestion. Our project aims at assessing the impact of cage bedding on several aspects of metabolic research. Mice were divided into an overnight (ON) fasted, caloric restricted (CR) and ad libitum groups. In order to evaluate the effects of different beddings, mice were housed in cages with the most commonly used beddings: wooden, corncob or cellulose. Additionally, ON-fasted mice were kept without bedding or on metal grid preventing coprophagy. Mice bedding consumption and faeces production were measured. Oral glucose tolerance test (OGTT) was performed. Metabolites composition and microbial diversity were analysed in caecum content. Mice organ weight and gene expression measurements were conducted. Mice show preference towards wooden bedding and consume it in highest amount followed by corncob and cellulose beddings. As a result of the bedding ingestion, caecum weight increases in the CR compared to ad libitum fed mice. CR leads to a reduced faeces production and it is the lowest in the CR wood and CR cellulose groups. Housing on metal grid results in greater body weight loss and decreases stomach and caecum size. ON-fasted mice housed without bedding or on grids show lower glucose levels when submitted to OGTT. CR influences the caecal bacterial diversity as well as the caecal metabolic profile. In the CR group, mice on the corncob bedding show a distinct caecal microbial composition and caecal metabolic profile compared to wooden and cellulose groups. CR is associated with increased abundance of Marinifilaceaefrom the phylum Bacteroidales, and Erysipelotrichaceaefrom the phylum Firmicutes and with a decreased abundance of Lachnospiraceaefrom the phylum Firmicutes. The main metabolites effected by CR are organic acids, fructose, sucrose and glutamine. The type of bedding exerts the strongest effect on valeric acid, lysine, threonine and organic acids. CR- and ON-fasting-associated weight loss, bedding consumption and fibre accumulation in the caecum depends on the bedding type. CR mice housed on wooden and cellulose beddings show similarities and are distinguishable from CR corncob group. Thus, depending on the composition and consumed amount, bedding intake affects numerous parameters and shapes the microbiome.
Visual stimulation with food pictures in regulation of hunger hormones and nutrient deposition
- Kalina Duszka, Andreas Baierl, Martin Reichel, András Gregor, Manfred Ogris, Jürgen König
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- Journal:
- Proceedings of the Nutrition Society / Volume 79 / Issue OCE2 / 2020
- Published online by Cambridge University Press:
- 10 June 2020, E124
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Food cues modulate hunger and dictate nutritional choices. The omnipresent stimulus of palatable food promotes the epidemics of obesity and metabolic diseases. The aim of our study was to investigate the impact of visual stimulation with food pictures on appetite-related hormones as well as the functionality of the secreted hormones and its impact on macronutrient uptake and deposition in healthy subjects. Additionally, we sought to identify differences in response to visual food cues of total and active ghrelin to and to a meal followed by the stimulation.
Healthy, non-obese participants were recruited for two two-day studies. During the first study, the subjects were shown random non-food pictures on the first day and pictures of appetizing foods on the second day of the study. The second study followed the same schedule and additionally, following the picture session, the participants were asked to drink a milkshake. The subjects reported subjective hunger. Levels of glucose, triglycerides and hunger-related hormones were measured in blood. In addition, an animal study was performed, during which 4 hours fasted mice were submitted to visual and olfactory stimulation using chow, while not being able to access the food. Following the stimulation, oral glucose tolerance test was performed, gene expression and blood total, as well as acylated ghrelin, were measured.
Exposure to food pictures affected participant's blood glucose and incretin levels. Concentrations of several hormones in the blood were interdependent and in case of ghrelin and GIP as well as ghrelin and GLP-1 this co-occurrence relied on the visual cues. Changes of total ghrelin concentration following food stimulation was highly individual and participants could be grouped as ghrelin responders or non-responders. The responders showed upregulated total ghrelin and their total ghrelin levels correlated with food picture score revealing that in ghrelin non-responders reaction to food pictures was diminished. The concentration of active ghrelin decreased following a meal but was not affected by exposure to the pictures of food. Protein content and color intensity of food pictures correlated reversely with participants’ rating of the pictures. Sensory stimulation of mice resulted in increased blood glucose levels.
We conclude that observation of food pictures significantly influences blood glucose levels and concentration of several appetite-related hormones. The protein content of the observed foods and green color intensity in pictures may serve as a predictor of subjective attractiveness of the presented meal.
Contributors
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- By Ghazi Al-Rawas, Vazken Andréassian, Tianqi Ao, Stacey A. Archfield, Berit Arheimer, András Bárdossy, Trent Biggs, Günter Blöschl, Theresa Blume, Marco Borga, Helge Bormann, Gianluca Botter, Tom Brown, Donald H. Burn, Sean K. Carey, Attilio Castellarin, Francis Chiew, François Colin, Paulin Coulibaly, Armand Crabit, Barry Croke, Siegfried Demuth, Qingyun Duan, Giuliano Di Baldassarre, Thomas Dunne, Ying Fan, Xing Fang, Boris Gartsman, Alexander Gelfan, Mikhail Georgievski, Nick van de Giesen, David C. Goodrich, Hoshin V. Gupta, Khaled Haddad, David M. Hannah, H. A. P. Hapuarachchi, Hege Hisdal, Kamila Hlavčová, Markus Hrachowitz, Denis A. Hughes, Günter Humer, Ruud Hurkmans, Vito Iacobellis, Elena Ilyichyova, Hiroshi Ishidaira, Graham Jewitt, Shaofeng Jia, Jeffrey R. Kennedy, Anthony S. Kiem, Robert Kirnbauer, Thomas R. Kjeldsen, Jürgen Komma, Leonid M. Korytny, Charles N. Kroll, George Kuczera, Gregor Laaha, Henny A. J. van Lanen, Hjalmar Laudon, Jens Liebe, Shijun Lin, Göran Lindström, Suxia Liu, Jun Magome, Danny G. Marks, Dominic Mazvimavi, Jeffrey J. McDonnell, Brian L. McGlynn, Kevin J. McGuire, Neil McIntyre, Thomas A. McMahon, Ralf Merz, Robert A. Metcalfe, Alberto Montanari, David Morris, Roger Moussa, Lakshman Nandagiri, Thomas Nester, Taha B. M. J. Ouarda, Ludovic Oudin, Juraj Parajka, Charles S. Pearson, Murray C. Peel, Charles Perrin, John W. Pomeroy, David A. Post, Ataur Rahman, Liliang Ren, Magdalena Rogger, Dan Rosbjerg, José Luis Salinas, Jos Samuel, Eric Sauquet, Hubert H. G. Savenije, Takahiro Sayama, John C. Schaake, Kevin Shook, Murugesu Sivapalan, Jon Olav Skøien, Chris Soulsby, Christopher Spence, R. ‘Sri’ Srikanthan, Tammo S. Steenhuis, Jan Szolgay, Yasuto Tachikawa, Kuniyoshi Takeuchi, Lena M. Tallaksen, Dörthe Tetzlaff, Sally E. Thompson, Elena Toth, Peter A. Troch, Remko Uijlenhoet, Carl L. Unkrich, Alberto Viglione, Neil R. Viney, Richard M. Vogel, Thorsten Wagener, M. Todd Walter, Guoqiang Wang, Markus Weiler, Rolf Weingartner, Erwin Weinmann, Hessel Winsemius, Ross A. Woods, Dawen Yang, Chihiro Yoshimura, Andy Young, Gordon Young, Erwin Zehe, Yongqiang Zhang, Maichun C. Zhou
- Edited by Günter Blöschl, Technische Universität Wien, Austria, Murugesu Sivapalan, University of Illinois, Urbana-Champaign, Thorsten Wagener, University of Bristol, Alberto Viglione, Technische Universität Wien, Austria, Hubert Savenije, Technische Universiteit Delft, The Netherlands
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- Book:
- Runoff Prediction in Ungauged Basins
- Published online:
- 05 April 2013
- Print publication:
- 18 April 2013, pp ix-xiv
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