Diabetes 50:1274-1281, 2001
© 2001 by the American Diabetes Association, Inc.
Peptide and Major Histocompatibility ComplexSpecific Breaking of Humoral Tolerance to Native Insulin With the B9-23 Peptide in Diabetes-Prone and Normal Mice
Norio Abiru,
Aristides K. Maniatis,
Liping Yu,
Dongmei Miao,
Hiroaki Moriyama,
Dale Wegmann, and
George S. Eisenbarth
Barbara Davis Center for Childhood Diabetes, University of Colorado Health Sciences Center, Denver, Colorado
NOD mice spontaneously develop anti-insulin autoantibodies and diabetes. A dominant peptide recognized by T-cell clones from NOD mice is insulin B-chain peptide B9-23. When administered subcutaneously to NOD mice, this peptide decreases the development of diabetes. In this study, we evaluated the autoantibody response to native insulin after administration of the B9-23 peptide. In NOD mice, administration of the B9-23 peptide in incomplete Freunds adjuvant enhanced their insulin autoantibody response with a higher level and longer persistence. Induction of insulin autoantibodies with the B9-23 peptide was observed in nondiabetes-prone BALB/c mice and NOR mice within 2 weeks of administration, but this was not observed in C57BL/6 mice. A series of A-chain, other B-chain, and proinsulin peptides did not induce insulin autoantibodies. Induced anti-insulin autoantibodies could not be absorbed with the peptide alone but could be absorbed with native insulin. The B13-23 peptide (one of two identified epitopes within B9-23) when administered to BALB/c mice, induced autoantibodies, whereas peptide B9-16 did not. Induction of autoantibodies mapped to the major histocompatibility complex (MHC) rather than to the background genes. Both splenocytes with I-Ad/I-Ed or I-Ag7/I-Enull presented the B9-23 peptide to NOD islet-derived T-cell clones. Finally, administration of the B9-23 peptide to BALB/c mice, even without adjuvant, could induce insulin autoantibodies. Our results indicate that B-cell tolerance to intact insulin is readily broken with the presentation of the B9-23 insulin peptide, depending on the hosts specific MHC.

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Copyright © 2001 by the American Diabetes Association.
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