Priming and effector dependence on insulin B:9-23 peptide in NOD islet autoimmunity.

Barbara Davis Center for Childhood Diabetes, University of Colorado Health Sciences Center (UCHSC), Aurora, CO 80045-6511, USA.
Journal of Clinical Investigation (Impact Factor: 13.77). 08/2007; 117(7):1835-43. DOI: 10.1172/JCI31368
Source: PubMed

ABSTRACT NOD mice with knockout of both native insulin genes and a mutated proinsulin transgene, alanine at position B16 in preproinsulin (B16:A-dKO mice), do not develop diabetes. Transplantation of NOD islets, but not bone marrow, expressing native insulin sequences (tyrosine at position B16) into B16:A-dKO mice rapidly restored development of insulin autoantibodies (IAAs) and insulitis, despite the recipients' pancreatic islets lacking native insulin sequences. Splenocytes from B16:A-dKO mice that received native insulin-positive islets induced diabetes when transferred into wild-type NOD/SCID or B16:A-dKO NOD/SCID mice. Splenocytes from mice immunized with native insulin B chain amino acids 9-23 (insulin B:9-23) peptide in CFA induced rapid diabetes upon transfer only in recipients expressing the native insulin B:9-23 sequence in their pancreata. Additionally, CD4(+) T cells from B16:A-dKO mice immunized with native insulin B:9-23 peptide promoted IAAs in NOD/SCID mice. These results indicate that the provision of native insulin B:9-23 sequences is sufficient to prime anti-insulin autoimmunity and that subsequent transfer of diabetes following peptide immunization requires native insulin B:9-23 expression in islets. Our findings demonstrate dependence on B16 alanine versus tyrosine of insulin B:9-23 for both the initial priming and the effector phase of NOD anti-islet autoimmunity.

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Available from: Jean M Jasinski, Dec 27, 2013
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    • "Studies on the insulin peptides that contribute to type 1 diabetes in NOD mice lead to related conclusions . Insulin has long been thought to be the source of autoantigenic peptides that are required for induction of type 1 diabetes , in mice at least ( Levisetti et al . , 2007 Mohan et al . , 2007 ; Nakayama et al . , 2007 ; Jarchum and DiLorenzo , 2009 ) . Although the por - tion of insulin that contains the culprit peptide has long been known , the precise insulin peptide that drives disease was for many years unknown . It turns out that the crucial product is unexpected , a peptide that binds poorly rather than well to IA g7 ( Stadinski et al . , 2010b"
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