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IL-13-induced oxidative stress via microglial NADPH oxidase contributes to death of hippocampal neurons in vivo.

Authors: Park, KW  Baik, HH  Jin, BK 
Citation: Park KW, etal., J Immunol. 2009 Oct 1;183(7):4666-74. doi: 10.4049/jimmunol.0803392. Epub 2009 Sep 14.
Pubmed: (View Article at PubMed) PMID:19752235
DOI: Full-text: DOI:10.4049/jimmunol.0803392

In the present study, we investigated the effects of IL-13, a well-known anti-inflammatory cytokine, on the thrombin-treated hippocampus in vivo. NeuN immunohistochemistry and Nissl staining revealed significant loss of hippocampal CA1 neurons upon intrahippocampal injection of thrombin. This neurotoxicity was accompanied by substantial microglial activation, as evident from OX-42 immunohistochemistry results. In parallel, Western blot analysis and hydroethidine histochemistry disclosed activation of NADPH oxidase, generation of reactive oxygen species, and oxidative damage in the hippocampal CA1 area showing hippocampal neuron degeneration. Interestingly, immunohistochemical and biochemical experiments showed that intrahippocampal injection of thrombin increased IL-13 immunoreactivity and IL-13 levels as early as 8 h after thrombin, reaching a peak at 7 days, which was maintained up to 14 days. Moreover, double-label immunohistochemistry revealed IL-13 immunoreactivity exclusively in activated microglia. IL-13-neutralizing Abs significantly rescued CA1 hippocampal neurons from thrombin neurotoxicity. In parallel, neutralization of IL-13 inhibited activation of NADPH oxidase, reactive oxygen species production, and oxidative damage. Additionally, IL-13 neutralization suppressed the expression of inducible NO synthase and several proinflammatory cytokines. To our knowledge, the present study is the first to show that IL-13 triggers microglial NADPH oxidase-derived oxidative stress, leading to the degeneration of hippocampal neurons in vivo, as occurs in cases of Alzheimer's disease.

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RGD ID: 8549634
Created: 2014-04-01
Species: All species
Last Modified: 2014-04-01
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.