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    Diabetes. 2006 Feb;55(2):538-44.

    Defective induction of CTLA-4 in the NOD mouse is controlled by the NOD allele of Idd3/IL-2 and a novel locus (Ctex) telomeric on chromosome 1.

    Lundholm M, Motta V, Löfgren-Burström A, Duarte N, Bergman ML, Mayans S, Holmberg D.

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    Department of Medical Biosciences, Division of Medical and Clinical Genetics, Umeå University, Sweden.

    Abstract

    Cytotoxic T-lymphocyte-associated antigen-4 (CTLA-4), or CD152, is a negative regulator of T-cell activation and has been shown to be associated with autoimmune diseases. Previous work has demonstrated a defect in the expression of this molecule in nonobese diabetic (NOD) mice upon anti-CD3 stimulation in vitro. Using a genetic approach we here demonstrate that a novel locus (Ctex) telomeric on chromosome 1 together with the Idd3 (Il-2) gene confers optimal CTLA-4 expression upon CD3 activation of T-cells. Based on these data, we provide a model for how gene interaction between Idd3 (IL-2), Ctex, and Idd5.1 (Ctla-4) could confer susceptibility to autoimmune diabetes in the NOD mouse. Additionally, we showed that the Ctex and the Idd3 regions do not influence inducible T-cell costimulator (ICOS) protein expression in NOD mice. Instead, as previously shown, higher ICOS levels in NOD mice appear to be controlled by gene(s) in the Idd5.1 region, possibly a polymorphism in the Icos gene itself.

    PMID:
    16443792
    [PubMed - indexed for MEDLINE]
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