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- W2007400388 abstract "Severe liver injury that occurs when immune cells mistakenly attack an individual's own liver cells leads to autoimmune hepatitis. In mice, acute hepatitis can be induced by concanavalin A (ConA) treatment, which causes rapid activation of CD1d-positive natural killer (NK) T cells. These activated NKT cells produce large amounts of cytokines, which induce strong inflammation that damages liver tissues. Here we show that PKC-θ(-/-) mice were resistant to ConA-induced hepatitis due to essential function of PKC-θ in NKT cell development and activation. A dosage of ConA (25 mg/kg) that was lethal to wild-type (WT) mice failed to induce death resulting from liver injury in PKC-θ(-/-) mice. Correspondingly, ConA-induced production of cytokines such as IFNγ, IL-6, and TNFα, which mediate the inflammation responsible for liver injury, were significantly lower in PKC-θ(-/-) mice. Peripheral NKT cells had developmental defects at early stages in the thymus in PKC-θ(-/-) mice, and as a result their frequency and number were greatly reduced. Furthermore, PKC-θ(-/-) bone marrow adoptively transferred to WT mice displayed similar defects in NKT cell development, suggesting an intrinsic requirement for PKC-θ in NKT cell development. In addition, upon stimulation with NKT cell-specific lipid ligand, peripheral PKC-θ(-/-) NKT cells produced lower levels of inflammatory cytokines than that of WT NKT cells, suggesting that activation of NKT cells also requires PKC-θ. Our results suggest PKC-θ is an essential molecule required for activation of NKT cell to induce hepatitis, and thus, is a potential drug target for prevention of autoimmune hepatitis." @default.
- W2007400388 created "2016-06-24" @default.
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- W2007400388 date "2012-02-07" @default.
- W2007400388 modified "2023-10-14" @default.
- W2007400388 title "Ameliorated ConA-Induced Hepatitis in the Absence of PKC-theta" @default.
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- W2007400388 doi "https://doi.org/10.1371/journal.pone.0031174" @default.
- W2007400388 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3274545" @default.
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