Tissue-specific differences in the development of insulin resistance in a mouse model for type 1 diabetes

  1. Michael Roden1,7,*
  1. 1 Institute for Clinical Diabetology, German Diabetes Center, 40225, Düsseldorf, Germany;
  2. 2 Institute for Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, 40225, Düsseldorf, Germany;
  3. 3 Department of Endocrinology, Ghent University Hospital, Ghent, Belgium
  4. 4 Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06510, USA;
  5. 5 Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT 06510, USA;
  6. 6 Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06510, USA;
  7. 7 Department of Endocrinology and Diabetology, Heinrich-Heine University, D-40225, Düsseldorf, Germany
  1. *Corresponding Author: Dr. Michael Roden, E-mail: michael.roden{at}ddz.uni-duesseldorf.de

Abstract

While insulin resistance is known to underlie type 2 diabetes, its role in the development of type 1 diabetes is gaining increasing interest more recently. In a model of type 1 diabetes, the non-obese diabetic (NOD) mouse, we found that insulin resistance driven by lipid- and glucose-independent mechanisms is already present in liver of pre-diabetic mice. Hepatic insulin resistance is associated with a transient rise in mitochondrial respiration, followed by increased production of lipid peroxides and c-jun N-terminal kinase (JNK) activity. At the onset of diabetes, increased adipose tissue lipolysis promotes myocellular diacylglycerol accumulation. This is paralleled by increased myocellular protein kinase C theta (PKCθ) activity and serum fetuin A levels. Muscle mitochondrial oxidative capacity is unchanged at the onset, but decreases at later stages of diabetes. In conclusion, hepatic and muscle insulin resistance manifest at different stages and involve distinct cellular mechanisms during the development of diabetes in the NOD mouse.

Footnotes

  • # Both authors contributed equally.

  • Received November 24, 2013.
  • Accepted June 5, 2014.

Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See http://creativecommons.org/licenses/by-nc-nd/3.0/ for details.

No Related Web Pages

This Article

  1. Diabetes
  1. Supplementary Data
  2. All Versions of this Article:
    1. db13-1794v1
    2. 63/11/3856 most recent