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oai:repisalud.isciii.es:20.500.12105/173952024-09-21T11:01:43Zcom_20.500.12105_19604com_20.500.12105_2051col_20.500.12105_19605

00925njm 22002777a 4500 dc Rada, Patricia author Pardo, Virginia author Mobasher, Maysa A author García-Martínez, Irma author Ruiz, Laura author González-Rodríguez, Águeda author Sanchez-Ramos, Cristina author Muntané, Jordi author Alemany, Susana author James, Laura P author Simpson, Kenneth J author Monsalve, María author Valdecantos, Maria Pilar author Valverde, Ángela M author 2018-05-01 AIMS Sirtuin 1 (SIRT1) is a key player in liver physiology and a therapeutic target against hepatic inflammation. We evaluated the role of SIRT1 in the proinflammatory context and oxidative stress during acetaminophen (APAP)-mediated hepatotoxicity. RESULTS SIRT1 protein levels decreased in human and mouse livers following APAP overdose. SIRT1-Tg mice maintained higher levels of SIRT1 on APAP injection than wild-type mice and were protected against hepatotoxicity by modulation of antioxidant systems and restrained inflammatory responses, with decreased oxidative stress, proinflammatory cytokine messenger RNA levels, nuclear factor kappa B (NFκB) signaling, and cell death. Mouse hepatocytes stimulated with conditioned medium of APAP-treated macrophages (APAP-CM) showed decreased SIRT1 levels; an effect mimicked by interleukin (IL)1β, an activator of NFκB. This negative modulation was abolished by neutralizing IL1β in APAP-CM or silencing p65-NFκB in hepatocytes. APAP-CM of macrophages from SIRT1-Tg mice failed to downregulate SIRT1 protein levels in hepatocytes. In vivo administration of the NFκB inhibitor BAY 11-7082 preserved SIRT1 levels and protected from APAP-mediated hepatotoxicity. INNOVATION Our work evidenced the unique role of SIRT1 in APAP hepatoprotection by targeting oxidative stress and inflammation. CONCLUSION SIRT1 protein levels are downregulated by IL1β/NFκB signaling in APAP hepatotoxicity, resulting in inflammation and oxidative stress. Thus, maintenance of SIRT1 during APAP overdose by inhibiting NFκB might be clinically relevant. Rebound Track: This work was rejected during standard peer review and rescued by Rebound Peer Review (Antioxid Redox Signal 16:293-296, 2012) with the following serving as open reviewers: Rafael de Cabo, Joaquim Ros, Kalervo Hiltunen, and Neil Kaplowitz. Antioxid. Redox Signal. 28, 1187-1208. Antioxid Redox Signal. 2018 May 1;28(13):1187-1208. 10.1089/ars.2017.7373 1557-7716 Antioxidants & redox signaling 29084443 http://hdl.handle.net/20.500.12105/17395 SIRT1 Controls Acetaminophen Hepatotoxicity by Modulating Inflammation and Oxidative Stress.