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IDDM (LEW.1AR1-iddm) Rat

IDDM (LEW.1AR1-iddm) Rat

An new animal model of human T1DM


The IDDM (LEW.1AR1-iddm) rat is a new animal model of human T1DM (Type 1 Diabetes Mellitus) which developed through a spontaneous mutation within a Mhc-congenic LEW.1AR1 colony. The IDDM rat closely resembles the diabetic syndrome in humans. The animals show a fully developed cellular immune system and no sex bias in the diabetes incidence.




Lenzen, S, Tiedge, M, Lortz, S, Elsner, M, Jörns, A, Klöppel, G, Wedekind, D, Prokop, C, Hedrich, HJ: The LEW.1AR1/Ztm-iddm rat - A new spontaneous insulin-dependent diabetes model. Diabetologia 44, 1189-96, 2001


Jörns, A, Kubat B, Tiedge M, Wedekind D, Hedrich HJ, Klöppel G, Lenzen S: Pathology of the pancreas and other organs in the diabetic LEW.1AR1/Ztm- iddm rat, a new model of spontaneous insulin-dependent diabetes mellitus. Virchows Arch. 444, 183-189, 2004


Jörns, A, Günther, A, Hedrich, H-J, Wedekind, D, Tiedge, M, Lenzen, S: Immune cell infiltration, cytokine expression and beta cell apoptosis during the development of insulin-dependent diabetes in the spontaneously diabetic LEW.1AR1/Ztm-iddm rat. Diabetes 54, 2041-2052, 2005


Wedekind, D, Weiss, H, Jörns, A, Lenzen, S, Tiedge, M, Hedrich, HJ: Effects of polyinosinic-polycytidylic acid and adoptive transfer of immune cells in the LEW.1AR1-iddm rat and in its coisogenic LEW.1AR1 background strain. Autoimmunity 38, 265-275, 2005


Weiss, H, Bleich, A, Hedrich, HJ, Kölsch, B, Elsner, M, Jörns, A, Lenzen, S, Tiedge, M, Wedekind, D: Genetic analysis of the LEW.1AR1-iddm rat, an animal model for spontaneous diabetes mellitus. Mamm Genome 16, 432-441, 2005


Weiss, H, Arndt, T, Jörns, A, Lenzen, S, Tiedge, M, Wedekind, D: The mutation of the LEW.1AR1-iddm rat maps to the telomeric end of rat chromosome 1. Mamm Genome 19, 292-297, 2008


Arndt T, Wedekind D, Weiss H, Tiedge M, Lenzen S, Hedrich HJ, Jörns A. Prevention of spontaneous immune-mediated diabetes development in the LEW.1AR1-iddm rat by selective CD8(+) T cell transfer is associated with a cytokine shift in the pancreas-draining lymph nodes. Diabetologia 52, 1381-1390, 2009 


Jörns A, Rath KJ, Terbish T, Arndt T, Meyer zu Vilsendorf A, Wedekind D, Hedrich HJ, Lenzen S. Diabetes prevention by immunomodulatory FTY720 treatment in the LEW.1AR1-iddm rat despite immune cell activation. Endocrinology 151, 3555-65, 2010


Arndt T, Jörns A, Weiss H, Tiedge M, Hedrich HJ, Lenzen S, Wedekind D. A variable CD3(+) T-cell frequency in peripheral blood lymphocytes associated with type 1 diabetes mellitus development in the LEW.1AR1-iddm rat. PLoS One 8. e64305, 2013


Jörns A, Arndt T, Meyer zu Vilsendorf A, Klempnauer J, Wedekind D, Hedrich HJ, Marselli L, Marchetti P, Harada N, Nakaya Y, Wang GS, Scott FW, Gysemans C, Mathieu C, Lenzen S. Islet infiltration, cytokine expression and beta cell death in NOD mouse, BB rat, Komeda rat, LEW.1AR1-iddm rat and humans with type 1 diabetes. Diabetologia 57, 512-521, 2014 


Jörns A, Akin M, Arndt T, Terbish T, Zu Vilsendorf AM, Wedekind D, Hedrich HJ, Lenzen S. Anti-TCR therapy combined with fingolimod for reversal of diabetic hyperglycemia by β cell regeneration in the LEW.1AR1-iddm rat model of type 1 diabetes. J Mol Med (Berl) 92, 743-755, 2014 


Arndt T, Jörns A, Hedrich HJ, Lenzen S, Wedekind D. Variable immune cell frequencies in peripheral blood of LEW.1AR1-iddm rats over time compared to other congenic LEW strains. Clin Exp Immunol. 177:168-78, 2014


Jörns A, Ertekin ÜG, Arndt T, Terbish T, Wedekind D, Lenzen S. TNF-α antibody therapy in combination with the T-cell specific antibody anti-TCR reverses the diabetic metabolic state in the LEW.1AR1-iddm rat: Diabetes 64, 2880-2891, 2015


Arndt T, Wedekind D, Jörns A, Tsiavaliaris G, Cuppen E, Hedrich H-J, Lenzen S. Mutation in the Dock8 gene causes diabetes in the LEW.1AR1-iddm rat, an animal model of human type 1 diabetes. Diabetologia 58, 2800-2809, 2015 


Scientists interested in this animal model should contact:

Prof. S. Lenzen
Institute of Experimental Diabetes Research
Hannover Medical School
Carl-Neuberg-Str. 1
30625 Hannover / Germany