Linked Life Data

19499520

Source:http://linkedlifedata.com/resource/pubmed/id/19499520

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pubmed-article:19499520pubmed:dateCreated2009-6-10lld:pubmed
pubmed-article:19499520pubmed:abstractTextThe pathogenesis of immune-mediated drug-induced liver injury (DILI) following halogenated anesthetics, carbamazepine or alcohol has not been fully elucidated. Detecting cytochrome P450 2E1 (CYP2E1) IgG4 auto-antibodies in anesthetic DILI patients suggests a role for IL-4 in this hapten-mediated process. We investigated IL-4-mediated mechanisms using our model of experimental DILI induced by immunizing BALB/c (WT) and IL-4(-/-) (KO) mice with S100 liver proteins covalently modified by a trifluoroacetyl chloride (TFA) hapten formed following halogenated anesthetic metabolism by CYP2E1. WT mice developed more hepatitis, TFA and S100 antibodies (p<0.01), as well as T-cell proliferation to CYP2E1 and TFA (p<0.01) than KO mice. Additionally, WT CD4(+) T cells adoptively transferred hepatitis to naïve Rag(-/-) mice (p<0.01). Pro-inflammatory cytokines were expectedly decreased in TFA hapten-stimulated KO splenocyte supernatants (p<0.001); however, IL-2 and IFN-gamma (p<0.05), as well as IL-6 and IL-10 (p<0.001) levels were elevated in CYP2E1-stimulated KO splenocyte supernatants, suggesting dual IL-4-mediated pro-inflammatory and regulatory responses. Anti-IL-10 administered to KO mice increased hepatitis, TFA and CYP2E1 antibodies in KO mice confirming a critical role for IL-4. This is the first demonstration of dual roles for IL-4 in the pathogenesis of immune-mediated DILI by suppressing auto-antigen-induced regulatory responses while promoting hapten-induced pro-inflammatory responses.lld:pubmed
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pubmed-article:19499520pubmed:authorpubmed-author:NjokuDolores...lld:pubmed
pubmed-article:19499520pubmed:authorpubmed-author:RoseNoel RNRlld:pubmed
pubmed-article:19499520pubmed:authorpubmed-author:TalorMonica...lld:pubmed
pubmed-article:19499520pubmed:authorpubmed-author:LiZhaoxiaZlld:pubmed
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