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Effects of Different Hypocaloric Diets on Protein Secretion From Adipose Tissue of Obese Women

¹ Department of Medicine, Karolinska Institute, Huddinge University Hospital, Stockholm, Sweden
² Obesity Research Unit, Institut National de la Santé et de la Recherche Médicale (INSERM) Unité 586, Institut Louis Bugnard, Centre Hospitalier Universitaire de Toulouse, Université Paul Sabatier, Toulouse, France
³ Institute of Preventive Medicine, Danish Epidemiology Science Centre, Copenhagen University Hospital, Copenhagen, Denmark

Little is known about common factors (e.g., macronutrients and energy supply) regulating the protein secretory function of adipose tissue. We therefore compared the effects of randomly assigned 10-week hypoenergetic (–600 kcal/day) diets with moderate-fat/moderate-carbohydrate or low-fat/high-carbohydrate content on circulating levels and production of proteins (using radioimmunoassays and enzyme-linked immunosorbent assays) from subcutaneous adipose tissue in 40 obese but otherwise healthy women. Similar results were obtained by the two diets. Body weight decreased by 7.5%. The secretion rate of leptin decreased by 40%, as did that of tumor necrosis factor- (TNF-), and interleukin (IL)-6 and -8 decreased by 25–30%, whereas the secretion of plasminogen activator inhibitor 1 (PAI-1) and adiponectin did not show any changes. Regarding mRNA expression (by real-time PCR), only that of leptin and IL-6 decreased significantly. Circulating levels of leptin and PAI-1 decreased by 30 and 40%, respectively, but there were only minor changes in circulating TNF-, IL-6, or adiponectin. In conclusion, moderate caloric restriction but not macronutrient composition influences the production and secretion of adipose tissue–derived proteins during weight reduction, leptin being the most sensitive and adiponectin and PAI-1 the least sensitive.

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