Long-term IKK2/NF-κB signaling in pancreatic β-cells induces immune-mediated diabetes mellitus

  1. Bernd Baumann1,#
  1. 1Institute of Physiological Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
  2. 2Center for Internal Medicine, Ulm University Medical Center, Ulm University Albert-Einstein-Allee 23, 89081 Ulm, Germany
  3. 3Division of Endocrinology, Diabetes and Metabolism, Ulm University Medical Centre, Ulm University, Albert-Einstein-Allee 23, 89081 Ulm, Germany
  4. 4Department of Biochemistry, Faculty of Pharmacy, Cairo University, Egypt
  1. #Corresponding Author: Bernd Baumann, Email: bernd.baumann{at}uni-ulm.de

Abstract

Type 1 diabetes is a multifactorial inflammatory disease in genetically susceptible individuals characterized by progressive autoimmune destruction of pancreatic β-cells initiated by yet unknown factors. Although animal models of type 1 diabetes have substantially increased our understanding of disease pathogenesis, heterogeneity seen in human patients cannot be reflected by a single model and calls for additional models covering different aspects of human pathophysiology. IKK/NF-κB signaling is a master regulator of inflammation; however its role in diabetes pathogenesis is controversially discussed by studies using different inhibition approaches. To investigate the potential diabetogenic effects of NF-κB in β-cells, we generated a gain-of-function model allowing conditional IKK2/NF-κB activation in β-cells. IKK2-CAPdx-1 mice spontaneously develop full-blown immune-mediated diabetes with insulitis, hyperglycemia and hypoinsulinemia. Disease development involves gene expression program mimicking virus-induced diabetes and allergic inflammatory responses as well as increased MHCI/II expression by β-cells that could collectively promote diabetes development. Potential novel diabetes candidate genes were also identified. Interestingly, animals successfully recovered from diabetes upon transgene inactivation. Our data gives the first direct evidence that β-cell-specific IKK2/NF-κB activation is a potential trigger of immune-mediated diabetes. Moreover, IKK2-CAPdx-1 mice provide a novel tool for studying critical checkpoints in diabetes pathogenesis and mechanisms governing β-cell degeneration/regeneration.

Footnotes

  • * LKC School of Medicine, Imperial College London and NTU, Singapore

  • Received July 2, 2013.
  • Accepted November 25, 2013.

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