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J. Exp. Med.,
Volume 188, Number 8, October 19, 1998 1445-1451
Cell-specific Expression of Thioredoxin,
an Antioxidative and Antiapoptotic Protein, Prevents
Autoimmune and Streptozotocin-induced Diabetes
By



From the * Department of Nutrition and Physiological Chemistry, and the The cytotoxicity of reactive oxygen intermediates (ROIs) has been implicated in the destruction of pancreatic
Department of Geriatric
Medicine, Osaka University Medical School, Osaka 565-0871, Japan; and the § Department of
Biological Responses, Institute for Virus Research, Kyoto University, Kyoto 606-8397, Japan
cells in insulin-dependent diabetes mellitus (IDDM). Thioredoxin (TRX),
a redox (reduction/oxidation)-active protein, has recently been shown to protect cells from
oxidative stress and apoptosis. To elucidate the roles of oxidative stress in the development of
autoimmune diabetes in vivo, we produced nonobese diabetic transgenic mice that overexpress
TRX in their pancreatic
cells. In these transgenic mice, the incidence of diabetes was markedly reduced, whereas the development of insulitis was not prevented. Moreover, induction of
diabetes by streptozotocin, an ROI-generating agent, was also attenuated by TRX overexpression in
cells. This is the first direct demonstration that an antioxidative and antiapoptotic protein protects
cells in vivo against both autoimmune and drug-induced diabetes. Our results
strongly suggest that oxidative stress plays an essential role in the destruction of
cells by infiltrating inflammatory cells in IDDM.
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