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They are experimentally induced in mouse liver by chronic intoxication with 3,5-diethoxycarbonyl-1,4-dihydrocollidine (DDC). Like in human diseases, mouse liver MDBs consist of stress proteins as major components indicating their relationship to chronic cellular stress. Mouse livers at different stages of DDC intoxication, recovery, and re-intoxication were analyzed with regard to cytochrome P450 (CYP) expression, enzyme activity, oxidative stress, and anti-oxidative response. mRNAs of cytochrome P450 2A5 (CYP2A5), heme oxygenase-1 (Hmox-1), and the ubiquitin-binding adapter protein p62\/sequestosome1 (p62) were significantly elevated by DDC treatment. CYP2A5 protein correlated at the cellular level with the presence of MDBs, and CYP2A5-related coumarin 7-hydroxylase (COH) activity was increased in relation to MDB expression. A functional relationship between CYP2A5 and Hmox-1 activity was established by the identification of bilirubin as a potent inhibitor of the production of reactive oxygen species (ROS) by CYP2A5. Moreover, CYP2E1 as well as CYP2A6, which are induced in human steatohepatitis, showed similar H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    production and inhibition by bilirubin in vitro. These findings suggest similar pathogenic mechanisms involved in MDB formation related to the overexpression of ROS-producing CYP2A5 in mice and CYP2E1 and CYP2A6 in human steatohepatitis.\n                  <\/jats:p>","DOI":"10.1007\/s00428-025-04290-4","type":"journal-article","created":{"date-parts":[[2025,10,30]],"date-time":"2025-10-30T21:35:34Z","timestamp":1761860134000},"page":"1265-1274","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Cytochrome P450 as possible link between Mallory-Denk body formation in DDC-intoxicated mouse liver and human steatohepatitis"],"prefix":"10.1007","volume":"488","author":[{"given":"Cornelia","family":"Stumptner","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karoline","family":"Fechter","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kurt","family":"Zatloukal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6959-0828","authenticated-orcid":false,"given":"Helmut","family":"Denk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,10,30]]},"reference":[{"key":"4290_CR1","doi-asserted-by":"publisher","first-page":"2033","DOI":"10.1016\/j.yexcr.2007.04.024","volume":"313","author":"K Zatloukal","year":"2007","unstructured":"Zatloukal K, French SW, Stumptner C et al (2007) From Mallory to Mallory-Denk bodies: what, how and why? 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