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    J Immunol. 2012 Jan 15;188(2):604-14. Epub 2011 Dec 16.

    Pre-B cell leukemia homeobox 1 is associated with lupus susceptibility in mice and humans.

    Cuda CM, Li S, Liang S, Yin Y, Potula HH, Xu Z, Sengupta M, Chen Y, Butfiloski E, Baker H, Chang LJ, Dozmorov I, Sobel ES, Morel L.

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    Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA.

    Abstract

    Sle1a.1 is part of the Sle1 susceptibility locus, which has the strongest association with lupus nephritis in the NZM2410 mouse model. In this study, we show that Sle1a.1 results in the production of activated and autoreactive CD4(+) T cells. Additionally, Sle1a.1 expression reduces the peripheral regulatory T cell pool, as well as induces a defective response of CD4(+) T cells to the retinoic acid expansion of TGF-β-induced regulatory T cells. At the molecular level, Sle1a.1 corresponds to an increased expression of a novel splice isoform of Pbx1, Pbx1-d. Pbx1-d overexpression is sufficient to induce an activated/inflammatory phenotype in Jurkat T cells and to decrease their apoptotic response to retinoic acid. PBX1-d is expressed more frequently in the CD4(+) T cells from lupus patients than from healthy controls, and its presence correlates with an increased central memory T cell population. These findings indicate that Pbx1 is a novel lupus susceptibility gene that regulates T cell activation and tolerance.

    PMID:
    22180614
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC3253202
    [Available on 2013/1/15]

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