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Monoclonal anti-tumor necrosis factor antibody renders non-obese diabetic mice hypersensitive to irradiation and enhances insulitis development.

In attempt to evaluate biological roles of tumor necrosis factor (TNF), we studied the effects of anti-TNF mAb in non-obese diabetic (NOD) mice. Anti-murine TNF mAb rendered NOD mice hypersensitive to the lethal effects of radiation and prevented the reconstitution of lethally irradiated mice with adoptively transferred lymphocytes. While TNF-alpha reduced the incidence of diabetes development in the adoptive transfer system even when given 6 days post-transfer, mAb to TNF could not reduce or increase the incidence of diabetes compared to control mice. Administration of TNF-alpha for 4 or 8 weeks significantly reduced the incidence of spontaneous insulitis in NOD mice, while anti-TNF mAb given for 8 weeks increased the incidence of insulitis significantly.