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    Blood. 2009 Mar 26;113(13):3027-30. Epub 2009 Jan 27.

    FAS-L, IL-10, and double-negative CD4- CD8- TCR alpha/beta+ T cells are reliable markers of autoimmune lymphoproliferative syndrome (ALPS) associated with FAS loss of function.

    Magerus-Chatinet A, Stolzenberg MC, Loffredo MS, Neven B, Schaffner C, Ducrot N, Arkwright PD, Bader-Meunier B, Barbot J, Blanche S, Casanova JL, Debré M, Ferster A, Fieschi C, Florkin B, Galambrun C, Hermine O, Lambotte O, Solary E, Thomas C, Le Deist F, Picard C, Fischer A, Rieux-Laucat F.

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    Inserm U768, Paris, France.

    Abstract

    Autoimmune lymphoproliferative syndrome (ALPS) is characterized by splenomegaly, lymphadenopathy, hypergammaglobulinemia, accumulation of double-negative TCRalphabeta(+) CD4(-)CD8(-) T cells (DNT cells), and autoimmunity. Previously, DNT cell detection and a functional defect of T cells in a FAS-induced apoptosis test in vitro had been used for ALPS diagnosis. However, a functional defect can also be detected in mutation-positive relatives (MPRs) who remain free of any ALPS-related disease. In contrast, lymphocytes from patients carrying a somatic mutation of FAS exhibit normal sensitivity to FAS-induced apoptosis in vitro. We assessed the soluble FAS-L concentration in the plasma of ALPS patients carrying FAS mutations. Overall, we showed that determination of the FAS-L represents, together with the IL-10 concentration and the DNT cell percentage, a reliable tool for the diagnosis of ALPS.

    PMID:
    19176318
    [PubMed - indexed for MEDLINE]
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