Summary
Prophylactic insulin administration is known to prevent hyperglycaemia in diabetes prone BB rats and non-obese diabetic mice. This study investigated the effect of insulin treatment on the development of overt diabetes, clinically inapparent anti-islet autoreactivity, and thyroiditis in RT6-depleted diabetes resistant BB rats. Fewer than 1% of these animals develop spontaneous diabetes, but if depleted of RT6+ T cells >50% become hyperglycaemic. We treated 30-day-old diabetes resistant rats with anti-RT6.1 monoclonal antibody, exogenous insulin, or both. Up to 60 days of age, 16 of 20 rats given antibody alone became diabetic, compared with 1 of 20 also treated with antibody plus insulin. Up to 110 days of age, only 1 of 10 rats treated with both insulin and antibody between 30 and 60 days became diabetic. Histologic study of non-diabetic insulin plus anti-RT6 antibody treated rats revealed insulitis in 3 of 9 at 60 days old, and insulitis in 3 of 8 and thyroiditis in 6 of 7 at 110 days of age. Non-diabetic animals were also found to harbour autoreactive spleen cells that adoptively transferred diabetes. Splenocytes from 60 or 110-day-old non-diabetic donors that had been treated with insulin and antibody between 30 and 60 days of age induced diabetes in 7 of 13 and 6 of 8 adoptive recipients respectively. We conclude that insulin treatment prevents clinical diabetes in the RT6-depleted diabetes resistant BB rat, but this treatment does not prevent the development of autoreactive cell populations that cause thyroiditis and adoptively transfer diabetes.
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Gottlieb, P.A., Handler, E.S., Appel, M.C. et al. Insulin treatment prevents diabetes mellitus but not thyroiditis in RT6-depleted diabetes resistant BB/Wor rats. Diabetologia 34, 296–300 (1991). https://doi.org/10.1007/BF00404999
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DOI: https://doi.org/10.1007/BF00404999