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INFLAMMATION/IMMUNITY/MEDIATORS
1Department of Integrative Pharmacology, Gastrointestinal Biology, 2Department of Molecular Pharmacology, and 3AstraZeneca Transgenics and Comparative Genomics Centre, AstraZeneca Research and Development, Mölndal; and 4Department of Physiology/Endocrinology, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, Göteborg University, Göteborg, Sweden
Submitted 6 April 2006 ; accepted in final form 5 July 2006
Patients with inflammatory bowel disease (IBD) suffer from body weight loss, malnutrition, and several other metabolic alterations affecting their quality of life. The aim of this study was to investigate the metabolic changes that may occur during acute and chronic colonic inflammation induced by dextran sulfate sodium (DSS) in mice. Clinical symptoms and inflammatory markers revealed the presence of an ongoing inflammatory response in the DSS-treated mice. Mice with acute inflammation had decreased body weight, respiratory exchange ratios (RER), food intake, and body fat content. Mice with chronic inflammation had decreased nutrient uptake, body fat content, locomotor activity, metabolic rates, and bone mineral density. Despite this, the body weight, food and water intake, lean mass, and RER of these mice returned to values similar to those in healthy controls. Thus, murine experimental colitis is associated with significant metabolic alterations similar to IBD patients. Our data show that the metabolic responses during acute and chronic inflammation are different, although the metabolic rate is reduced in both phases. These observations suggest compensatory metabolic alterations in chronic colitis resulting in a healthy appearance despite gross colon pathology.
dual-energy X-ray absorptiometry; dextran sulfate sodium; colon inflammation; respiratory exchange ratio
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