Hansen 2015 Obesity (Silver Spring)
|Hansen M, Lund MT, Gregers E, Kraunsøe R, Van Hall G, Helge JW, Dela F (2015) Adipose tissue mitochondrial respiration and lipolysis before and after a weight loss by diet and RYGB. Obesity (Silver Spring) 23:2022-9.|
Abstract: OBJECTIVE: To study adipose tissue mitochondrial respiration and lipolysis following a massive weight loss.
METHODS: High-resolution respirometry of adipose tissue biopsies and tracer determined whole body lipolysis. Sixteen obese patients with type 2 diabetes (T2DM) and 27 without (OB) were studied following a massive weight loss by diet and Roux-en-Y gastric bypass (RYGB).
RESULTS: The mitochondrial respiratory rates were similar in OB and T2DM, and the mass-specific oxygen flux increased significantly 4 and 18 months post-surgery (P < 0.05). With normalization to mitochondrial content, no differences in oxidative capacity after RYGB were seen. The ratio between the oxidative phosphorylation system capacity (P) and the capacity of the electron transfer-pathway (E) increased 18 months after RYGB in both groups (P < 0.05). Lipolysis per fat mass was similar in the two groups and was increased (P < 0.05) and lipid oxidation during hyperinsulinemia decreased 4 months post-surgery. In T2DM, visceral fat mass was always higher relative to the body fat mass (%) compared to OB.
CONCLUSIONS: Adipose tissue mitochondrial respiratory capacity increases with RYGB. Adipocytes adapt to massive weight loss by increasing the phosphorylation system ratio (P/E), suggesting an increased ability to oxidize substrates after RYGB. Lipolysis increases in the short term post-surgery, and insulin sensitivity for suppression of lipolysis increases with RYGB.
Labels: MiParea: Respiration, Exercise physiology;nutrition;life style, Patients Pathology: Diabetes, Obesity
Organism: Human Tissue;cell: Fat Preparation: Permeabilized tissue
Coupling state: LEAK, OXPHOS, ET Pathway: F, N, NS HRR: Oxygraph-2k