{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,10]],"date-time":"2026-04-10T03:09:31Z","timestamp":1775790571666,"version":"3.50.1"},"reference-count":68,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2024,2,7]],"date-time":"2024-02-07T00:00:00Z","timestamp":1707264000000},"content-version":"vor","delay-in-days":37,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000265","name":"Medical Research Council","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100000265","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Discovery Medicine North (DiMeN) Doctoral Training Partnership"},{"name":"Biopredic International","award":["10528AAG10"],"award-info":[{"award-number":["10528AAG10"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Background<\/jats:title>\n                  <jats:p>\u03b2-d-N4-Hydroxycytidine (NHC) is the active metabolite of molnupiravir, a broad-spectrum antiviral approved by the MHRA for COVID-19 treatment. NHC induces lethal mutagenesis of the SARS-CoV-2 virus, undergoing incorporation into the viral genome and arresting viral replication. It has previously been reported that several nucleoside analogues elicit off-target inhibition of mitochondrial DNA (mtDNA) or RNA replication. Although NHC does not exert these effects in HepG2 cells, HepaRG are proven to be advantageous over HepG2 for modelling nucleoside analogue-induced mitochondrial dysfunction. Therefore, the objective of this work was to assess the mitotoxic potential of NHC in HepaRG cells, a model more closely resembling physiological human liver.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>Differentiated HepaRG cells were exposed to 1\u201360 \u03bcM NHC for 3\u201314 days to investigate effects of sub-, supra-, and clinically-relevant exposures (in the UK, molnupiravir for COVID-19 is indicated for 5 days and reported Cmax is 16 \u03bcM). Following drug incubation, cell viability, mtDNA copy number, mitochondrial protein expression, and mitochondrial respiration were assessed.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>NHC induced minor decreases in cell viability at clinically relevant exposures, but did not decrease mitochondrial protein expression. The effects on mtDNA were variable, but typically copy number was increased. At supra-clinical concentrations (60 \u03bcM), NHC reduced mitochondrial respiration, but did not appear to induce direct electron transport chain dysfunction.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>Overall, NHC does not cause direct mitochondrial toxicity in HepaRG cells at clinically relevant concentrations, but may induce minor cellular perturbations. As HepaRG cells have increased physiological relevance, these findings provide additional assurance of the mitochondrial safety profile of NHC.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/toxres\/tfae012","type":"journal-article","created":{"date-parts":[[2024,2,7]],"date-time":"2024-02-07T11:17:12Z","timestamp":1707304632000},"source":"Crossref","is-referenced-by-count":4,"title":["Assessing the mitochondrial safety profile of the molnupiravir active metabolite, \u03b2-d-N4-hydroxycytidine (NHC), in the physiologically relevant HepaRG model"],"prefix":"10.1093","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7960-7283","authenticated-orcid":false,"given":"Robyn T","family":"Kiy","sequence":"first","affiliation":[{"name":"Department of Pharmacology and Therapeutics, University of Liverpool , Sherrington Building, Ashton Street, Liverpool, L69 3GE , United Kingdom"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saye H","family":"Khoo","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Therapeutics, University of Liverpool , Sherrington Building, Ashton Street, Liverpool, L69 3GE , United Kingdom"},{"name":"Tropical Infectious Diseases Unit, Royal Liverpool University Hospital , Prescot Street, Liverpool, L7 8XP , United Kingdom"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7399-8655","authenticated-orcid":false,"given":"Amy E","family":"Chadwick","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Therapeutics, University of Liverpool , Sherrington Building, Ashton Street, Liverpool, L69 3GE , United Kingdom"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2024,2,7]]},"reference":[{"issue":"5","key":"2024020711160290600_ref1","doi-asserted-by":"crossref","first-page":"475","DOI":"10.1016\/S2213-2600(20)30079-5","article-title":"Clinical 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