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Type 2 Diabetes Modifies Skeletal Muscle Gene Expression Response to Gastric Bypass Surgery.

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  • 1Center for Genetic Medicine Research, Children's National Research Institute, Washington, DC, United States.

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Summary

Roux-en-Y gastric bypass (RYGB) improves skeletal muscle health in type 2 diabetes (T2DM) by normalizing gene expression related to aerobic metabolism. This surgery effectively resolves pre-existing metabolic dysregulation in muscle tissue.

Keywords:
bariatric (weight-loss) surgerygene expressionmetabolismskeletal muscletype 2 diabetes (T2D)

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Area of Science:

  • Metabolic Surgery
  • Molecular Biology
  • Endocrinology

Background:

  • Roux-en-Y gastric bypass (RYGB) effectively treats type 2 diabetes mellitus (T2DM), often leading to remission.
  • Mechanisms underlying RYGB's positive impact on skeletal muscle health in T2DM patients remain unclear.
  • Understanding these mechanisms is crucial for optimizing T2DM management and improving patient outcomes.

Purpose of the Study:

  • To investigate the influence of type 2 diabetes (T2DM) on muscle transcriptome changes induced by RYGB.
  • To identify specific molecular pathways affected by RYGB in the skeletal muscle of T2DM patients.

Main Methods:

  • Vastus lateralis muscle biopsies were obtained pre- and 1-year post-RYGB from Black women with and without T2DM.
  • Gene expression profiling (transcriptomes) was performed on muscle tissue.
  • Differential gene expression analysis identified significantly altered genes and enriched biological pathways.

Main Results:

  • Prior to RYGB, T2DM was associated with downregulation of genes involved in mitochondrial complex I and aerobic metabolism.
  • One year after RYGB, gene expression in T2DM patients normalized, with only three probes significantly different compared to controls.
  • RYGB induced upregulation of specific genes, including NDFUB7 and NDFUA1, in the T2DM group.

Conclusions:

  • Black women with T2DM exhibit significant downregulation of aerobic metabolism genes before RYGB, which is reversed post-surgery.
  • RYGB-induced improvements in skeletal muscle gene expression correlate with enhanced clinical markers of T2DM.
  • These findings highlight RYGB's efficacy in restoring skeletal muscle health, particularly in individuals with T2DM.