Journal
JOURNAL OF IMMUNOLOGY
Volume 171, Issue 7, Pages 3333-3337Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.171.7.3333
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APCs of the nonobese diabetic (NOD) mouse have a genetically programmed capacity to overexpress IL-12p40, a cytokine critical for development of pathogenic autoreactive Th1 cells. To determine whether a diabetes-associated NOD chromosomal locus (i.e., Idd) was responsible for this defect, LPS-stimulated macrophages from several recombinant congenic inbred mice with Idd loci on a C57BL/6 background or with different combinations of NOD and CBA genomic segments were screened for IL-12p,40 production. Only macrophages from the congenic strains containing the Idd4 locus showed IL-12p40 over-production/expression. Moreover, analysis of IL-12p40 sequence polymorphisms demonstrated that the Idd4 intervals in these strains contained the IL-12p40 allele of the NOD, although further analysis is required to determine whether the IL-12p40 allele itself is responsible for its overexpression. Thus, the non-MHC-associated Idd4 locus appears responsible for IL-12p40 overexpression, which may be a predisposing factor for type 1 diabetes in NOD mice.
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