Protection against autoimmune diabetes with oral insulin is associated with the presence of IL-4 type 2 T-cells in the pancreas and pancreatic lymph nodes

Diabetes
C PloixC Thivolet

Abstract

Oral administration of antigens has been proposed in the prevention and treatment of autoimmune diseases. We reported that oral administration of 0.8 mg of recombinant human insulin to 6-week-old NOD mice every other day for a month generated regulatory T-cells that were able to reduce the severity of insulitis and the percentage of clinical diabetes in naive irradiated recipients when co-injected with diabetogenic T-cells. In the present study, immunohistochemical analysis of the pancreatic glands revealed that injection of T-cells from insulin-fed mice upregulated the number of interleukin (IL)-4-secreting cells within the islets. Using two strains of NOD mice congenic at the Tbeta, or Thy1, locus, we observed a higher proportion of T-cells from insulin-fed mice in both the spleen (7.73 +/- 0.3 vs. 5.57 +/- 0.2%; P < 0.001) and the pancreatic lymph nodes (10.1 +/- 0.8 vs. 7.2 +/- 0.7%; P < 0.05) of cotransferred mice. By reverse transcription-polymerase chain reaction (RT-PCR) analysis, mice reconstituted with T-cells from insulin-fed animals had detectable amounts of IL-4 mRNA, specifically in the pancreatic lymph nodes (8 of 9 experimental mice vs. 1 of 9 control mice) and the pancreas (3 of 3 experimental mice vs. 0 of 3 c...Continue Reading

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