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However, the mechanisms underlying ER stress remain poorly understood, thus reducing the options for exploring new pharmacological therapies for patients with hyperacute liver injury. Eight-to-twelve-week-old C57BL\/6J <jats:italic>Xbp1<\/jats:italic>-floxed (<jats:italic>Xbp1<\/jats:italic><jats:sup><jats:italic>f\/f<\/jats:italic><\/jats:sup>) and hepatocyte<jats:italic>-<\/jats:italic>specific knockout Xbp1 mice (<jats:italic>Xbp1<\/jats:italic><jats:sup><jats:italic>\u2206hepa<\/jats:italic><\/jats:sup>) were challenged with either high dose APAP [500\u2009mg\/kg] and sacrificed at early (1\u20132\u2009h) and late (24\u2009h) stages of hepatotoxicity. Histopathological examination of livers, immunofluorescence and immunohistochemistry, Western blot, real time (RT)-qPCR studies and transmission electron microscopy (TEM) were performed. Pharmacological inhibition of XBP1 using pre-treatment with STF-083010 [STF, 75\u2009mg\/kg] and autophagy induction with Rapamycin [RAPA, 8\u2009mg\/kg] or blockade with Chloroquine [CQ, 60\u2009mg\/kg] was also undertaken in vivo. Cytoplasmic expression of XBP1 coincided with severity of human and murine hyperacute liver injury. Transcriptional and translational activation of the UPR and sustained activation of JNK1\/2 were major events in APAP hepatotoxicity, both in a human hepatocytic cell line and in a preclinical model. <jats:italic>Xbp1<\/jats:italic><jats:sup><jats:italic>\u2206hepa<\/jats:italic><\/jats:sup> livers showed decreased UPR and JNK1\/2 activation but enhanced autophagy in response to high dose APAP. Additionally, blockade of XBP1 splicing by STF, mitigated APAP-induced liver injury and without non-specific off-target effects (e.g., CYP2E1 activity). Furthermore, enhanced autophagy might be responsible for modulating CYP2E1 activity in <jats:italic>Xbp1<\/jats:italic><jats:sup><jats:italic>\u2206hepa<\/jats:italic><\/jats:sup> animals. Genetic and pharmacological inhibition of <jats:italic>Xbp1<\/jats:italic> specifically in hepatocytes ameliorated APAP-induced liver injury by enhancing autophagy and decreasing CYP2E1 expression. These findings provide the basis for the therapeutic restoration of ER stress and\/or induction of autophagy in patients with hyperacute liver injury.<\/jats:p>","DOI":"10.1038\/s41419-022-04580-8","type":"journal-article","created":{"date-parts":[[2022,2,10]],"date-time":"2022-02-10T09:02:55Z","timestamp":1644483775000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":43,"title":["Genetic and pharmacological inhibition of XBP1 protects against APAP hepatotoxicity through the activation of autophagy"],"prefix":"10.1038","volume":"13","author":[{"given":"Hui","family":"Ye","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaobo","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanghang","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kang","family":"Zheng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beatriz","family":"Mart\u00edn-Adrados","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Esther","family":"Caparros","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rub\u00e9n","family":"Franc\u00e9s","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leonard J.","family":"Nelson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manuel","family":"G\u00f3mez del Moral","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Iris","family":"Asensio","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"Vaquero","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rafael","family":"Ba\u00f1ares","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mat\u00edas A.","family":"\u00c1vila","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ra\u00fal J.","family":"Andrade","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Isabel Lucena","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6446-9911","authenticated-orcid":false,"given":"Maria Luz","family":"Mart\u00ednez-Chantar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0359-9795","authenticated-orcid":false,"given":"Helen L.","family":"Reeves","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1041-9844","authenticated-orcid":false,"given":"Steven","family":"Masson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9704-248X","authenticated-orcid":false,"given":"Richard S.","family":"Blumberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7736-4089","authenticated-orcid":false,"given":"Jordi","family":"Gracia-Sancho","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yulia A.","family":"Nevzorova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eduardo","family":"Mart\u00ednez-Naves","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1499-650X","authenticated-orcid":false,"given":"Francisco Javier","family":"Cubero","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,2,10]]},"reference":[{"key":"4580_CR1","doi-asserted-by":"publisher","first-page":"307","DOI":"10.1084\/jem.20111298","volume":"209","author":"KY Hur","year":"2012","unstructured":"Hur KY, So JS, Ruda V, Frank-Kamenetsky M, Fitzgerald K, Koteliansky V, et al. 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Animal work was approved by the Conserjer\u00eda de Medio Ambiente, Administraci\u00f3n Local y Ordenaci\u00f3n del Territorio (PROEX-218\/17, 125.1\/20 and 397.2\/21).","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics"}}],"article-number":"143"}}