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Angiopoietin-like protein 6 in patients with obesity, type 2 diabetes mellitus, and anorexia nervosa: The influence of very low-calorie diet, bariatric surgery, and partial realimentation.

Endocrine Research 2017 Februrary
AIM OF THE STUDY: Angiopoietin-like protein 6 (ANGPTL6) is a circulating protein with a potential role in energy homeostasis. The aim of the study was to explore the changes in ANGPTL6 levels in patients with obesity (Body mass index, BMI > 40 kg/m2 ) with and without type 2 diabetes mellitus (T2DM) undergoing dietary intervention (very low calorie diet - VLCD) and in a subgroup of T2DM patients after bariatric surgery. Additionally, we examined changes in ANGPTL6 in anorexia nervosa (AN) patients at baseline and after partial realimentation. We also explored the changes in ANGPTL6 mRNA expression in subcutaneous adipose tissue (SAT) of obese subjects.

MATERIALS AND METHODS: The study included 23 non-diabetic obese patients, 40 obese patients with T2DM (27 underwent VLCD and 13 underwent bariatric surgery), 22 patients with AN, and 37 healthy control subjects.

RESULTS: ANGPTL6 levels of AN patients were increased relative to the control group (68.6 ± 9.9 ng/ml) and decreased from 110.2 ± 13.3 to 73.6 ± 7.1 ng/ml (p = 0.004) after partial realimentation. Baseline ANGPTL6 levels in patients with obesity and T2DM did not differ from the control group. VLCD decreased ANGPTL6 levels only in obese patients with T2DM. Bariatric surgery induced a transient elevation of ANGPTL6 levels with a subsequent decrease to baseline levels. ANGPTL6 mRNA expression transiently increased after bariatric surgery and returned to baseline levels after 12 months.

CONCLUSIONS: Collectively, our data suggest that serum ANGPTL6 levels and ANGPTL6 mRNA expression in SAT are affected by metabolic disorders and their treatment but do not appear to directly reflect nutritional status.

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