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Comparative study on muscle function in two different streptozotocin-induced diabetic models.

Rahmawati Aisyah1, Mion Kamesawa1, Mayu Horii1

  • 1Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, 739-8528, Japan.

Acta Diabetologica
|June 10, 2024
PubMed
Summary
This summary is machine-generated.

The moderate-dose streptozotocin (STZ) model effectively assesses diabetic muscle fatigability, unlike other models. Understanding molecular differences is key for studying diabetic myopathy.

Keywords:
Fatigue resistanceMitochondrial dysfunctionMuscle contraction forceStreptozotocin

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Area of Science:

  • Endocrinology and Metabolism
  • Physiology
  • Molecular Biology

Background:

  • Streptozotocin (STZ) is a common agent for inducing diabetes in research.
  • High-dose STZ exhibits nonspecific cytotoxicity, leading to the development of alternative models.
  • Moderate-dose STZ or low-dose STZ combined with a high-fat diet are established alternatives.

Purpose of the Study:

  • To compare the effects of two STZ-induced diabetes models on muscle function.
  • To evaluate the utility of these models for studying diabetic myopathy.

Main Methods:

  • Two STZ models were used: moderate-dose (100 mg/kg, twice) and combined low-dose STZ (50 mg/kg for 5 days) with a high-fat diet (45%).
  • In vivo electrical stimulation assessed muscle function.
  • Biochemical and gene expression analyses were performed on skeletal muscle.

Main Results:

  • Contractile force was not significantly different between models and controls.
  • The moderate-dose STZ model exhibited increased muscle fatigue.
  • Exercise-induced glycogen degradation was blunted in the moderate-dose STZ model, potentially due to downregulated genes related to oxidative phosphorylation and vasculature development.

Conclusions:

  • The moderate-dose STZ model is suitable for assessing fatigability in diabetes.
  • Understanding the distinct molecular profiles of each model is crucial for selecting appropriate models to study diabetic myopathy.