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On adequate procedures for glucose tolerance tests in obese animals: Measurement of glucose tolerance in obesity
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Routine procedures for glucose tolerance test in rodents utilize an amount of injected glucose that is proportional to total body weight (normally 2 mg per g body weight). Obese mice consist of much more chemically inert lipid than lean mice but have only marginal increases in lean body mass (the only compartment where glucose is distributed). Present procedures thus inevitably lead to a diagnosis of impaired glucose tolerance and enhanced insulin levels in obesity. Routine procedures should use fixed glucose amounts per lean body mass (or per mouse).

National Category
Biological Sciences
Research subject
Physiology
Identifiers
URN: urn:nbn:se:su:diva-115871OAI: oai:DiVA.org:su-115871DiVA: diva2:800514
Available from: 2015-04-06 Created: 2015-04-06 Last updated: 2016-01-29Bibliographically approved
In thesis
1. Thermal physiology and metabolism: Interplay between heat generation and energy homeostasis
Open this publication in new window or tab >>Thermal physiology and metabolism: Interplay between heat generation and energy homeostasis
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Mammal metabolism is intimately connected to the maintenance of body temperature. While metabolic pathways invariably produce heat as a by-product, the natural heat present in the environment also plays a role in defining the adaptive metabolism and general physiology of an organism. This thesis aims to discuss basic aspects of energy expenditure and their interactions with energy stores and body composition. In Paper I, we apply a new technique – high-resolution laser-Doppler imaging – to describe physiological regulatory features of adrenergically-stimulated blood flow in brown adipose tissue, and evaluate the validity of blood flow as a parameter to estimate nonshivering thermogenesis. Paper II focuses on the central regulation of body temperature. In the absence of bombesin receptor subtype-3, mice present an altered neurological body temperature setpoint, while peripheral thermogenic capacity remains intact. We conclude that brown adipose tissue malfunction is not the cause of the hypothermia observed in this mouse model. Paper III incorporates measurements of body temperature to the energy expenditure of different sources: basal metabolic rate, physical activity, thermic effect of food, and cold-induced thermogenesis. We describe basic aspects of dynamic insulation, energetic costs of circadian variation and hypothesize that physical activity may change the body temperature setpoint. Paper IV describes methodological issues related to glucose tolerance tests in obese mice. We conclude that the erroneous scaling of doses may affect the interpretation of metabolic health in mouse models, and suggest a new methodology. Paper V describes the outcomes caused by the expression of the human Cidea protein in adipose tissue of mice and suggests that this protein may clarify the link between adipose tissue expansion and healthy obesity. Paper VI explores the dissociation between thiazolidinedione-induced adipose tissue “browning” and reduced blood glycaemia. We demonstrate that although this pharmacological class tends to induce some level of brown adipose tissue recruitment, this phenomenon does not define its antidiabetic effects.

Place, publisher, year, edition, pages
Stockholm: Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, 2015. 55 p.
National Category
Physiology
Research subject
Physiology
Identifiers
urn:nbn:se:su:diva-115874 (URN)978-91-7649-156-0 (ISBN)
Public defence
2015-05-13, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript. Paper 5: Manuscript. Paper 6: Manuscript.

Available from: 2015-04-20 Created: 2015-04-06 Last updated: 2017-03-28Bibliographically approved

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Abreu-Vieira, GustavoBengtsson, TorePetrovic, NatasaNedergaard, Jan
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