{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,16]],"date-time":"2026-05-16T11:41:11Z","timestamp":1778931671331,"version":"3.51.4"},"reference-count":65,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2023,4,21]],"date-time":"2023-04-21T00:00:00Z","timestamp":1682035200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Russian Science Foundation","award":["#19-14-00197"],"award-info":[{"award-number":["#19-14-00197"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Antioxidants"],"abstract":"<jats:p>Hepatitis delta virus (HDV) is a viroid-like satellite that may co-infect individuals together with hepatitis B virus (HBV), as well as cause superinfection by infecting patients with chronic hepatitis B (CHB). Being a defective virus, HDV requires HBV structural proteins for virion production. Although the virus encodes just two forms of its single antigen, it enhances the progression of liver disease to cirrhosis in CHB patients and increases the incidence of hepatocellular carcinoma. HDV pathogenesis so far has been attributed to virus-induced humoral and cellular immune responses, while other factors have been neglected. Here, we evaluated the impact of the virus on the redox status of hepatocytes, as oxidative stress is believed to contribute to the pathogenesis of various viruses, including HBV and hepatitis C virus (HCV). We show that the overexpression of large HDV antigen (L-HDAg) or autonomous replication of the viral genome in cells leads to increased production of reactive oxygen species (ROS). It also leads to the upregulated expression of NADPH oxidases 1 and 4, cytochrome P450 2E1, and ER oxidoreductin 1\u03b1, which have previously been shown to mediate oxidative stress induced by HCV. Both HDV antigens also activated the Nrf2\/ARE pathway, which controls the expression of a spectrum of antioxidant enzymes. Finally, HDV and its large antigen also induced endoplasmic reticulum (ER) stress and the concomitant unfolded protein response (UPR). In conclusion, HDV may enhance oxidative and ER stress induced by HBV, thus aggravating HBV-associated pathologies, including inflammation, liver fibrosis, and the development of cirrhosis and hepatocellular carcinoma.<\/jats:p>","DOI":"10.3390\/antiox12040974","type":"journal-article","created":{"date-parts":[[2023,4,21]],"date-time":"2023-04-21T06:54:19Z","timestamp":1682060059000},"page":"974","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Hepatitis Delta Virus Antigens Trigger Oxidative Stress, Activate Antioxidant Nrf2\/ARE Pathway, and Induce Unfolded Protein Response"],"prefix":"10.3390","volume":"12","author":[{"given":"Olga A.","family":"Smirnova","sequence":"first","affiliation":[{"name":"Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3673-4714","authenticated-orcid":false,"given":"Olga N.","family":"Ivanova","sequence":"additional","affiliation":[{"name":"Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Furkat","family":"Mukhtarov","sequence":"additional","affiliation":[{"name":"Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vladimir T.","family":"Valuev-Elliston","sequence":"additional","affiliation":[{"name":"Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Artemy P.","family":"Fedulov","sequence":"additional","affiliation":[{"name":"Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Petr M.","family":"Rubtsov","sequence":"additional","affiliation":[{"name":"Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Natalia F.","family":"Zakirova","sequence":"additional","affiliation":[{"name":"Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sergey N.","family":"Kochetkov","sequence":"additional","affiliation":[{"name":"Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6354-4660","authenticated-orcid":false,"given":"Birke","family":"Bartosch","sequence":"additional","affiliation":[{"name":"Centre de Recherche en Canc\u00e9rologie de Lyon, Universit\u00e9 Claude Bernard Lyon 1, INSERM 1052, CNRS 5286, 69434 Lyon, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5659-9679","authenticated-orcid":false,"given":"Alexander V.","family":"Ivanov","sequence":"additional","affiliation":[{"name":"Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1016\/S0140-6736(10)61931-9","article-title":"Hepatitis delta virus","volume":"378","author":"Hughes","year":"2011","journal-title":"Lancet"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"228","DOI":"10.1055\/s-0032-1323628","article-title":"Clinical Features of Hepatitis D","volume":"32","author":"Farci","year":"2012","journal-title":"Semin. 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