Interleukin-1 receptor antagonist is upregulated during diet-induced obesity and regulates insulin sensitivity in rodents

Aims/hypothesis The IL-1 receptor antagonist (IL-1Ra) is an anti-inflammatory cytokine known to antagonise the actions of IL-1. We have previously shown that IL-1Ra is markedly upregulated in the serum of obese patients, is correlated with BMI and insulin resistance, and is overexpressed in the whit...

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Veröffentlicht in:Diabetologia 2006-02, Vol.49 (2), p.387-393
Hauptverfasser: Somm, E, Cettour-Rose, P, Asensio, C, Charollais, A, Klein, M, Theander-Carrillo, C, Juge-Aubry, C. E, Dayer, J. -M, Nicklin, M. J. H, Meda, P, Rohner-Jeanrenaud, F, Meier, C. A
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container_issue 2
container_start_page 387
container_title Diabetologia
container_volume 49
creator Somm, E
Cettour-Rose, P
Asensio, C
Charollais, A
Klein, M
Theander-Carrillo, C
Juge-Aubry, C. E
Dayer, J. -M
Nicklin, M. J. H
Meda, P
Rohner-Jeanrenaud, F
Meier, C. A
description Aims/hypothesis The IL-1 receptor antagonist (IL-1Ra) is an anti-inflammatory cytokine known to antagonise the actions of IL-1. We have previously shown that IL-1Ra is markedly upregulated in the serum of obese patients, is correlated with BMI and insulin resistance, and is overexpressed in the white adipose tissue (WAT) of obese humans. The aim of this study was to examine the role of IL-1Ra in the regulation of glucose homeostasis in rodents. Methods We assessed the expression of genes related to IL-1 signalling in the WAT of mice fed a high-fat diet, as well as the effect of Il1rn (the gene for IL-1Ra) deletion and treatment with IL-1Ra on glucose homeostasis in rodents. Results We show that the expression of Il1rn and the gene encoding the inhibitory type II IL-1 receptor was upregulated in diet-induced obesity. The blood insulin:glucose ratio was significantly lower in Il1rn -/- animals, which is compatible with an increased sensitivity to insulin, reinforced by the fact that the insulin content and pancreatic islet morphology of Il1rn -/- animals were normal. In contrast, the administration of IL-1Ra to normal rats for 5 days led to a decrease in the whole-body glucose disposal due to a selective decrease in muscle-specific glucose uptake. Conclusions/interpretation The expression of genes encoding inhibitors of IL-1 signalling is upregulated in the WAT of mice with diet-induced obesity, and IL-1Ra reduces insulin sensitivity in rats through a muscle-specific decrease in glucose uptake. These results suggest that the markedly increased levels of IL-1Ra in human obesity might contribute to the development of insulin resistance.
doi_str_mv 10.1007/s00125-005-0046-x
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Methods We assessed the expression of genes related to IL-1 signalling in the WAT of mice fed a high-fat diet, as well as the effect of Il1rn (the gene for IL-1Ra) deletion and treatment with IL-1Ra on glucose homeostasis in rodents. Results We show that the expression of Il1rn and the gene encoding the inhibitory type II IL-1 receptor was upregulated in diet-induced obesity. The blood insulin:glucose ratio was significantly lower in Il1rn -/- animals, which is compatible with an increased sensitivity to insulin, reinforced by the fact that the insulin content and pancreatic islet morphology of Il1rn -/- animals were normal. In contrast, the administration of IL-1Ra to normal rats for 5 days led to a decrease in the whole-body glucose disposal due to a selective decrease in muscle-specific glucose uptake. 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Conclusions/interpretation The expression of genes encoding inhibitors of IL-1 signalling is upregulated in the WAT of mice with diet-induced obesity, and IL-1Ra reduces insulin sensitivity in rats through a muscle-specific decrease in glucose uptake. These results suggest that the markedly increased levels of IL-1Ra in human obesity might contribute to the development of insulin resistance.</abstract><cop>Berlin</cop><pub>Berlin/Heidelberg : Springer-Verlag</pub><pmid>16385385</pmid><doi>10.1007/s00125-005-0046-x</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record>
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subjects Adipose Tissue - physiopathology
Animals
Biological and medical sciences
Blood Glucose - analysis
Body fat
Cytokines
Diabetes. Impaired glucose tolerance
Diet
Dietary Fats - adverse effects
Endocrine pancreas. Apud cells (diseases)
Endocrinopathies
Etiopathogenesis. Screening. Investigations. Target tissue resistance
Gene Deletion
Gene Expression Regulation
Glucose
Glucose Clamp Technique
High-fat diet
Homeostasis
IL-1
IL-1Ra
Insulin - blood
Insulin - physiology
Insulin resistance
Insulin Resistance - genetics
Insulin Resistance - physiology
Interleukin 1 Receptor Antagonist Protein
interleukin-1
Interleukin-1 - physiology
Interleukin-1 receptor antagonist
Internal medicine
Islets of Langerhans - chemistry
Islets of Langerhans - pathology
Male
Medical sciences
Medicine
Metabolic diseases
Metabolism
Mice
Mice, Inbred C57BL
Mice, Knockout
Muscle, Skeletal - metabolism
Obesity
Obesity - etiology
Obesity - genetics
Obesity - physiopathology
Physiology
Receptors, Interleukin-1 - antagonists & inhibitors
Receptors, Interleukin-1 - genetics
Receptors, Interleukin-1 - physiology
Receptors, Interleukin-1 Type II
RNA, Messenger - analysis
RNA, Messenger - genetics
Rodents
Sialoglycoproteins - genetics
Sialoglycoproteins - pharmacology
Sialoglycoproteins - physiology
Signal Transduction
Up-Regulation
title Interleukin-1 receptor antagonist is upregulated during diet-induced obesity and regulates insulin sensitivity in rodents
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