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- W2109351611 abstract "Prevention of type 1 diabetes in NOD mice by 1,25-dihydroxyvitamin D3 [1alpha,25(OH)2D3] is accompanied by a T-helper (Th) 1/Th2 cytokine shift in the pancreas. The aim of this study was to investigate whether this immune shift also occurs outside of the pancreas and whether it is limited to autoantigen-specific immune responses. NOD mice treated with 1alpha,25(OH)2D3 (5 microg/kg every 2 days) or control vehicle were immunized with GAD65 (p524-543) or ovalbumin (OVA) in the rear footpads. First, we examined T-cell proliferation and cytokine production (via enzyme-linked immunosorbent assay) of draining lymph node cells in vitro with or without peptide rechallenge. Although no differences in proliferation were measured between control and 1alpha,25(OH)2D3-treated mice after in vitro GAD65 rechallenge, a marked shift in cytokine secretion profile was seen in 1alpha,25(OH)2D3-treated mice: interleukin-4 was increased (37 +/- 5 vs. 21 +/- 12 pg/ml in controls, P < 0.005), whereas gamma-interferon levels were decreased (6 +/- 3 vs. 9 +/- 3 ng/ml in controls, P < 0.05). This shift was absent in OVA-primed mice. Second, we measured cytokine profiles by reverse transcriptase-polymerase chain reaction in popliteal lymph nodes at different time points after priming with GAD65 or OVA in vivo. A marked Th1/Th2 shift occurred in 1alpha,25(OH)2D3-treated mice after in vivo priming with GAD65. Again, this shift was absent after OVA immunization. Finally, we measured cytokine profiles after rechallenge with a panel of autoantigens (GAD65, heat shock protein 65, insulin B-chain) and control antigens (OVA, keyhole limpet hemocyanine, myelin proteolipid protein, tetanus toxin) and confirmed the Th1/Th2 shift in autoantigen-injected mice but not in control antigen-injected mice. In conclusion, the immune deviation induced by 1alpha,25(OH)2D3 in NOD mice can also be induced in the peripheral immune system but is limited to pancreatic autoantigens." @default.
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- W2109351611 date "2000-08-01" @default.
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- W2109351611 title "1alpha,25-dihydroxyvitamin D3 induces an autoantigen-specific T-helper 1/T-helper 2 immune shift in NOD mice immunized with GAD65 (p524-543)." @default.
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- W2109351611 doi "https://doi.org/10.2337/diabetes.49.8.1301" @default.
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