Inhibition of VEGFR-2 Reverses Type 1 Diabetes in NOD Mice by Abrogating Insulitis and Restoring Islet Function
- S. Armando Villalta1,
- Jiena Lang1,
- Samantha Kubeck1,
- Beniwende Kabre1,
- Gregory L. Szot1,
- Boris Calderon2,
- Clive Wasserfall3,
- Mark A. Atkinson3,
- Rolf A. Brekken4,
- Nick Pullen5,
- Robert H. Arch6 and
- Jeffrey A. Bluestone1⇑
- 1Diabetes Center and the Department of Medicine, University of California San Francisco, San Francisco, California
- 2Division of Laboratory and Genomic Medicine. Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri
- 3Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, Florida
- 4Division of Surgical Oncology, Department of Surgery and Department of Pharmacology, Hamon Center for Therapeutic Oncology Research, University of Texas Southwestern Medical Center, Dallas, Texas
- 5Pfizer Global Research and Development, Cambridge Massachusetts
- 6Pfizer Global Research and Development, Chesterfield, Missouri
- Corresponding author: Jeffrey A. Bluestone, .
The dysregulation of receptor tyrosine kinases (RTKs) in multiple cell types during chronic inflammation is indicative of their pathogenic role in autoimmune diseases. Among the many RTKs, vascular endothelial growth factor receptor (VEGFR) stands out for its multiple effects on immunity, vascularization, and cell migration. Herein, we examined whether VEGFR participated in the pathogenesis of type 1 diabetes (T1D) in nonobese diabetic (NOD) mice. We found that RTK inhibitors (RTKIs) and VEGF or VEGFR-2 antibodies reversed diabetes when administered at the onset of hyperglycemia. Increased VEGF expression promoted islet vascular remodeling in NOD mice, and inhibition of VEGFR activity with RTKIs abrogated the increase in islet vascularity, impairing T-cell migration into the islet and improving glucose control. Metabolic studies confirmed that RTKIs worked by preserving islet function as treated mice had improved glucose tolerance without affecting insulin sensitivity. Finally, examination of human pancreata from patients with T1D revealed that VEGFR-2 was confined to the islet vascularity, which was increased in inflamed islets. Collectively, this work reveals a previously unappreciated role for VEGFR-2 signaling in the pathogenesis of T1D by controlling T-cell accessibility to the pancreatic islets and highlights a novel application of VEGFR-2 antagonists for the therapeutic treatment of T1D.
- Received November 21, 2012.
- Accepted March 26, 2013.
- © 2013 by the American Diabetes Association.
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