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Skeletal muscle cell-specific differences in type 2 diabetes.

Noni T Frankenberg1, Shaun A Mason2, Glenn D Wadley2

  • 1Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, 3086, Australia.

Cellular and Molecular Life Sciences : CMLS
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PubMed
Summary
This summary is machine-generated.

Type 2 diabetes alters glucose storage in skeletal muscle. Specific muscle fiber types show different glycogen levels, impacting glucose handling in individuals with type 2 diabetes.

Keywords:
Glucose regulationGlycogenHyperinsulinaemic euglycaemic clampSingle fibres

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Area of Science:

  • * Exercise physiology and molecular biology.
  • * Biochemistry and cellular metabolism.

Background:

  • * Skeletal muscle stores glucose as glycogen, with distinct slow-twitch (Type I) and fast-twitch (Type II) fibers exhibiting varied metabolic and contractile properties.
  • * Understanding glycogen metabolism differences between fiber types and in type 2 diabetes (T2D) is crucial for metabolic health.

Purpose of the Study:

  • * To investigate differential protein abundance and cellular localization related to glycogen metabolism in human skeletal muscle fiber types.
  • * To compare these findings between control (CON) individuals and those with type 2 diabetes (T2D).

Main Methods:

  • * Dissection of individual vastus lateralis muscle fiber segments from CON and T2D participants.
  • * Cell-type-specific analysis using immunoblotting to measure glycogen and related proteins.
  • * Assessment of glycogen localization (loosely bound/cytosolic vs. tightly bound).

Main Results:

  • * Type 2 diabetes was associated with a lower proportion of Type I muscle fibers compared to controls.
  • * Proteins like AMPK-β2, glycogen branching enzyme (GBE), glycogen debranching enzyme (GDE), and glycogen phosphorylase (GP) showed differential localization across fiber types and between CON and T2D.
  • * A significantly lower proportion of diffusible (cytosolic) glycogen was observed in Type I fibers of T2D individuals compared to CON.

Conclusions:

  • * Cell type is a critical factor in assessing skeletal muscle glycogen metabolism, particularly in type 2 diabetes.
  • * Specific muscle fiber types exhibit distinct glucose handling capabilities in type 2 diabetes.
  • * Findings highlight cell-specific differences in glycogen metabolism, offering insights into glucose dysregulation in T2D.