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Effect of hypocaloric diet-induced weight loss in obese women on plasma apelin and adipose tissue expression of apelin and APJ.

Isabelle Castan-Laurell^1,2,*, Michaela Vítkova^3,*, Danièle Daviaud^1,2, Cédric Dray^1,2, Michaela Kováiková^3,4,5, Zuzana Kovacova^3,4,5, Jindriska Hejnova^3,4, Vladimir Stich^3,4 and Philippe Valet^1,2

¹ Inserm, U858 Équipe 3, Institut de Médecine Moléculaire de Rangueil, BP84225, Toulouse F-31432 Cedex 4, France² Université de Toulouse,, Institut Louis Bugnard IFR31, Toulouse F-31432, France³ Franco-Czech Laboratory for Clinical Research on Obesity,, ⁴ Department of Sports Medicíne and ⁵ Division of Cell and Molecular Biology,, 3rd Faculty of Medicine, Charles University in Prague, Prague CZ-100 00, Czech Republic

(Correspondence should be addressed to I Castan-Laurell; Email: isabelle.castan{at}toulouse.inserm.fr)

Objective: Apelin is a novel adipokine acting on APJ receptor, regulated by insulin and tumor necrosis factor- (TNF-) in adipose tissue (AT). Plasma apelin levels are increased in obese hyperinsulinemic subjects. The aim was to investigate whether the hypocaloric diet associated with weight loss modifies the elevated plasma apelin levels and the expression of apelin and APJ receptor in AT in obese women.

Design and methods: Fasting plasma levels of apelin and TNF- as well as mRNA levels of apelin and APJ in AT were measured before and after a 12-week hypocaloric weight-reducing diet in 20 obese women (body mass index (BMI) before diet 32.2±6.4 kg/m²). Twelve healthy women with a BMI of 20.7±0.6 kg/m² served as reference.

Results: Plasma levels of apelin and TNF- were higher in obese compared with lean controls. The hypocaloric diet resulted in a significant decrease of BMI to 29.8±6.3 kg/m², plasma insulin (8.16±0.73 to 6.58±0.66 mU/l), apelin (369±25 pg/ml to 257±12 pg/ml), TNF- levels (0.66±0.04 pg/ml to 0.56±0.04 pg/ml), and AT mRNAs of apelin and APJ. In addition, changes in AT mRNA apelin were related to changes in AT mRNA APJ levels.

Conclusion: The hypocaloric diet associated with weight loss reduces the increased plasma and AT expression of apelin in obese women. This reduced apelin expression in AT could contribute to decreased circulating apelin levels.