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The Nrf2 pathway is controlled by microRNAs and Kelch-like ECH-associated protein1 (Keap1).<jats:italic>Nrf2 is stabilized when Keap1 is<\/jats:italic>degraded through the autophagy pathway in a p62-dependent manner. The inhibition of autophagy causes protein accumulation, and Keap1 is inactivated by binding to p62. We investigated the role of the Nrf2\/Keap1 axis in the amelioration of oxidative stress in primary biliary cholangitis (PBC). Liver specimens from patients with PBC, with (n\u2009=\u200924) or without cirrhosis (n\u2009=\u200914), and from controls (n\u2009=\u200916) were used for molecular analyses. We found that Nrf2 protein levels were elevated in PBC compared to controls, but Nrf2 gene expression was significantly reduced in cirrhotic PBC. Nrf2 target gene products, HO-1 and GCLC proteins, were reduced compared to controls and reduction of Nrf2 gene expression was associated with elevated levels of microRNA-132 and microRNA-34a. Both Keap1 and p62 protein levels were substantially increased in PBC compared to controls. PBC was associated with reduced Nrf2 expression and autophagy deterioration and these impairments were more advanced in patients with cirrhosis. Aberrant Nrf2\/Keap1 system integrity may affect self-defence mechanisms against oxidative stress in PBC.<\/jats:p>","DOI":"10.1038\/srep44769","type":"journal-article","created":{"date-parts":[[2017,3,23]],"date-time":"2017-03-23T13:12:21Z","timestamp":1490274741000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":91,"title":["Protection against oxidative stress mediated by the Nrf2\/Keap1 axis is impaired in Primary Biliary Cholangitis"],"prefix":"10.1038","volume":"7","author":[{"given":"Urszula","family":"Wasik","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ma\u0142gorzata","family":"Milkiewicz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Agnieszka","family":"Kempinska-Podhorodecka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Piotr","family":"Milkiewicz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2017,3,23]]},"reference":[{"key":"BFsrep44769_CR1","doi-asserted-by":"crossref","first-page":"1620","DOI":"10.1002\/hep.28140","volume":"62","author":"U Beuers","year":"2015","unstructured":"Beuers, U. et al. \u201cChanging nomenclature for PBC: From \u2018cirrhosis\u2019 to \u2018cholangitis\u2019\u201d, Hepatology 62, 1620\u20131622 (2015).","journal-title":"Hepatology"},{"key":"BFsrep44769_CR2","doi-asserted-by":"crossref","first-page":"461","DOI":"10.1016\/j.cld.2008.02.015","volume":"12","author":"P Milkiewicz","year":"2008","unstructured":"Milkiewicz, P. \u201cLiver transplantation in primary biliary cirrhosis\u201d, Clin. 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