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The recent discovery of HMGB1 as a late mediator of lethal sepsis has prompted investigation into development of several new experimental therapeutics that limit release, either blocking HMGB1 itself or its nominal receptors. Quercetin was recently identified as an experimental therapeutic that significantly protects against oxidative injury. Here, we report that quercetin attenuates lethal systemic inflammation caused by endotoxemia, even if treatment is started after the early TNF response. Quercetin treatment reduced circulating levels of HMGB1 in animals with established endotoxemia. In macrophage cultures, quercetin inhibited release as well as the cytokine activities of HMGB1, including limiting the activation of mitogen-activated protein kinase and NF-\u03baB, two signaling pathways that are critical for HMGB1-induced subsequent cytokine release. Quercetin and autophagic inhibitor, wortmannin, inhibited LPS-induced type-II microtubule-associated protein 1A\/1B\u2013light chain 3 production and aggregation, as well as HMGB1 translocation and release, suggesting a potential association between autophagy and HMGB1 release. Quercetin delivery, a strategy to pharmacologically inhibit HMGB1 release that is effective at clinically achievable concentrations, now warrants further evaluation in sepsis and other systemic inflammatory disorders.<\/jats:p>","DOI":"10.1165\/rcmb.2008-0119oc","type":"journal-article","created":{"date-parts":[[2009,3,6]],"date-time":"2009-03-06T00:10:31Z","timestamp":1236298231000},"page":"651-660","source":"Crossref","is-referenced-by-count":110,"title":["Quercetin Prevents LPS-Induced High-Mobility Group Box 1 Release and Proinflammatory Function"],"prefix":"10.1093","volume":"41","author":[{"given":"Daolin","family":"Tang","sequence":"first","affiliation":[{"name":"Laboratory of Shock, Department of Pathophysiology, Xiangya School of Medicine"},{"name":"Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, 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