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High Variability of Insulin Sensitivity in Closely Related Obese Mouse Inbred Strains.

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Summary

Two obese mouse lines, BFMI860-12 and BFMI861-S1, exhibit impaired insulin sensitivity and metabolic syndrome factors. These models aid in studying insulin resistance mechanisms.

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Area of Science:

  • Metabolic research
  • Genetics
  • Physiology

Background:

  • Obesity is a significant risk factor for insulin resistance and type 2 diabetes.
  • Understanding the genetic basis of metabolic syndrome is crucial for developing effective interventions.

Purpose of the Study:

  • To investigate insulin sensitivity and metabolic syndrome factors in obese mouse inbred lines derived from the Berlin Fat Mouse (BFM) population.
  • To identify genetic variations contributing to insulin resistance by analyzing skeletal muscle insulin signaling pathways.

Main Methods:

  • Six obese mouse inbred lines were maintained on a standard diet.
  • Insulin sensitivity, adiposity, and serum lipid levels were assessed.
  • Transcript and protein levels of key insulin signaling pathway genes in skeletal muscle were measured.

Main Results:

  • Two lines, BFMI860-12 and BFMI861-S1, displayed significantly reduced insulin sensitivity by 20 weeks of age.
  • BFMI861-S1 mice showed elevated liver triglycerides, indicating lipid overload.
  • Skeletal muscle analysis revealed altered insulin receptor (INSR) and glucose transporter 4 (GLUT4) protein levels in these lines, with closely related sublines remaining insulin-sensitive.

Conclusions:

  • The study identified two distinct mouse models (BFMI860-12 and BFMI861-S1) with impaired insulin signaling.
  • These models are valuable for elucidating the pathophysiology of the metabolic syndrome, particularly insulin resistance.
  • The genetic relatedness of the lines facilitates the identification of causal genetic factors.