Roux-en-Y gastric bypass surgery restores insulin-mediated glucose partitioning and mitochondrial dynamics in primary myotubes from severely obese humans.

Autor: Kugler BA; Department of Exercise and Health Sciences, College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, 02125, USA., Gundersen AE; Department of Exercise and Health Sciences, College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, 02125, USA., Li J; Department of Exercise and Health Sciences, College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, 02125, USA.; School of Sports Medicine and Health, Chengdu Sport Institute, Chengdu, 610041, Sichuan, China., Deng W; Department of Exercise and Health Sciences, College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, 02125, USA.; School of Sports Medicine and Health, Chengdu Sport Institute, Chengdu, 610041, Sichuan, China., Eugene N; Department of Exercise and Health Sciences, College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, 02125, USA., Gona PN; Department of Exercise and Health Sciences, College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, 02125, USA., Houmard JA; Human Performance Laboratory, East Carolina University, Greenville, NC, 27858, USA.; Department of Kinesiology, East Carolina University, Greenville, NC, 27858, USA.; East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, 27858, USA., Zou K; Department of Exercise and Health Sciences, College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, 02125, USA. kai.zou@umb.edu.
Jazyk: angličtina
Zdroj: International journal of obesity (2005) [Int J Obes (Lond)] 2020 Mar; Vol. 44 (3), pp. 684-696. Date of Electronic Publication: 2019 Oct 17.
DOI: 10.1038/s41366-019-0469-y
Abstrakt: Background/objectives: Impaired insulin-mediated glucose partitioning is an intrinsic metabolic defect in skeletal muscle from severely obese humans (BMI ≥ 40 kg/m 2 ). Roux-en-Y gastric bypass (RYGB) surgery has been shown to improve glucose metabolism in severely obese humans. The purpose of the study was to determine the effects of RYGB surgery on glucose partitioning, mitochondrial network morphology, and the markers of mitochondrial dynamics skeletal muscle from severely obese humans.
Subject/methods: Human skeletal muscle cells were isolated from muscle biopsies obtained from RYGB patients (BMI = 48.0 ± 2.1, n = 7) prior to, 1 month and 7 months following surgery and lean control subjects (BMI = 22.4 ± 1.1, n = 7). Complete glucose oxidation, non-oxidized glycolysis rates, mitochondrial respiratory capacity, mitochondrial network morphology, and the regulatory proteins of mitochondrial dynamics were determined in differentiated human myotubes.
Results: Myotubes derived from severely obese humans exhibited enhanced glucose oxidation (13.5%; 95% CI [7.6, 19.4], P = 0.043) and reduced non-oxidized glycolysis (-1.3%; 95% CI [-11.1, 8.6]) in response to insulin stimulation at 7 months after RYGB when compared with the presurgery state (-0.6%; 95% CI [-5.2, 4.0] and 19.5%; 95% CI [4.0, 35.0], P = 0.006), and were not different from the lean controls (16.7%; 95% CI [11.8, 21.5] and 1.9%; 95% CI [-1.6, 5.4], respectively). Further, the number of fragmented mitochondria and Drp1(Ser 616 ) phosphorylation were trended to reduce/reduced (0.0104, 95% CI [0.0085, 0.0126], P = 0.091 and 0.0085, 95% CI [0.0068, 0.0102], P = 0.05) in myotubes derived from severely obese humans at 7 months after RYGB surgery in comparison with the presurgery state. Finally, Drp1(Ser 616 ) phosphorylation was negatively correlated with insulin-stimulated glucose oxidation (r = -0.49, P = 0.037).
Conclusion/interpretation: These data indicate that an intrinsic metabolic defect of glucose partitioning in skeletal muscle from severely obese humans is restored by RYGB surgery. The restoration of glucose partitioning may be regulated through reduced mitochondrial fission protein Drp1 phosphorylation.
Databáze: MEDLINE
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