Novel leptin receptor mutation in NOD/LtJ mice suppresses type 1 diabetes progression: II. immunologic analysis

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Novel leptin receptor mutation in NOD/LtJ mice suppresses type 1 diabetes progression: II. immunologic analysis
Chul Ho Lee; Y G Chen; J Chen; P C Reifsnyder; D V Serreze; M Clare-Salzler; M Rodriguez; C Wasserfall; M A Atkinson; E H Leiter
Bibliographic Citation
Diabetes, vol. 55, no. 1, pp. 171-178
Publication Year
Recently, we identified in normally type 1 diabetes-prone NOD/LtJ mice a spontaneous new leptin receptor (LEPR) mutation (designated Lepr db-5J) producing juvenile obesity, hyperglycemia, hyperinsulinemia, and hyperleptinemia. This early type 2 diabetes syndrome suppressed intraislet insulitis and permitted spontaneous diabetes remission. No significant differences in plasma corticosterone, splenic CD4+ or CD8+ T-cell percentages, or functions of CD3+ T-cells in vitro distinguished NOD wild-type from mutant mice. Yet splenocytes from hyperglycemic mutant donors failed to transfer type 1 diabetes into NOD.Rag1-/- recipients over a 13-week period, whereas wild-type donor cells did so. This correlated with significantly reduced (P < 0.01) frequencies of insulin and isletspecific glucose-6-phosphatase catalytic subunit-related protein-reactive CD8+ T-effector clonotypes in mutant mice. Intra-islet insulitis was also significantly suppressed in lethally irradiated NOD-Leprdb-5J/Lt recipients reconstituted with wild-type bone marrow (P < 0.001). In contrast, type 1 diabetes eventually developed when mutant marrow was transplanted into irradiated wild-type recipients. Mitogen-induced T-cell blastogenesis was significantly suppressed when splenic T-cells from both NOD/Lt and NOD-Leprdb-5J/Lt donors were incubated with irradiated mutant peritoneal exudate cells (P < 0.005). In conclusion, metabolic disturbances elicited by a type 2 diabetes syndrome (insulin and/or leptin resistance, but not hypercorticism) appear to suppress type 1 diabetes development in NOD-Leprdb-5J/Lt by inhibiting activation of T-effector cells.
Amer Diabetes Assoc
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Ochang Branch Institute > Division of National Bio-Infrastructure > Laboratory Animal Resource & Research Center > 1. Journal Articles
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