Reversal of diabetes in non-obese diabetic mice without spleen cell-derived beta cell regeneration.

Autoimmune destruction of beta cells is the predominant cause of type 1 diabetes mellitus (T1DM) in humans and is modeled in non-obese diabetic (NOD) mice. Many therapeutic interventions prevent the development of T1DM in NOD mice, but few can induce its reversal once established. Intervention with Freund's complete adjuvant, semi-allogeneic splenocytes, and temporary islet transplantation has been reported to cure NOD mice of established T1DM. Using the same approach, we report here that this treatment cured 32% of NOD mice of established diabetes (>340 milligrams per deciliter blood glucose), although beta cells in these mice were not derived from donor splenocytes.