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Centre of Inflammation and Metabolism (CIM)


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205Association between IL-15 and obesity: IL-15 as a potential regulator of fat mass.
Nielsen AR; Hojman P; Erikstrup C; Fischer CP; Plomgaard P; Mounier R; Mortensen OH; Broholm C; Taudorf S; Krogh-Madsen R; Lindegaard B; Petersen AM; Gehl J; Pedersen BK
J Clin Endocrinol Metab 2008; 93(11): 4486-93
PubMed ID: 18697873

OBJECTIVE: IL-15 decreases lipid deposition in preadipocytes and decreases the mass of white adipose tissue in rats, indicating that IL-15 may take part in regulating this tissue. IL-15 is expressed in human skeletal muscle and skeletal muscle may be a source of plasma IL-15 and in this way regulate adipose tissue mass. DESIGN: The relation between skeletal muscle IL-15 mRNA expression, plasma IL-15, and adipose tissue mass was studied in 199 humans divided into four groups on the basis of obesity and type 2 diabetes. Furthermore, using a DNA electrotransfer model, we assessed the effect of IL-15 overexpression in skeletal muscle of mice. RESULTS: In humans, multiple regression analysis showed a negative association between plasma IL-15 and total fat mass (P<0.05), trunk fat mass (P<0.01), and percent fat mass (P<0.05), independent of type 2 diabetes. Negative associations were also found between muscle IL-15 mRNA and obesity parameters. IL-15 overexpression in skeletal muscle of mice reduced trunk fat mass but not sc fat mass. CONCLUSIONS: Our results indicate that IL-15 may be a regulator of trunk fat mass.

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