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Ethanol-induced mitophagy in liver is associated with activation of the PINK1-Parkin pathway triggered by oxidative DNA damage

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dc.contributor.authorEid, Nabil
dc.contributor.authorIto, Yuko
dc.contributor.authorHoribe, Akio
dc.contributor.authorOtsuki, Yoshinori
dc.date.accessioned2021-10-29T10:02:08Z
dc.date.available2021-10-29T10:02:08Z
dc.date.issued2016
dc.description.abstractMitophagy is a cytoprotective mechanism against mitochondrial damaging agents. Studies demonstrating morphological evidence for the involvement of the PINK1-Parkin pathway in the hepatocyte mitophagic response to ethanol toxicity, and potential links to apoptosis and mitochondrial alterations such as spheroid formation are still lacking. We addressed these unresolved issues using a rat model of binge alcohol exposure. Adult rats were injected with ethanol (5g/kg) and liver samples were taken at 0, 3, 6, and 24 hours after ethanol administration and processed for light and electron microscopic studies. Ethanol induced a low level of hepatocyte apoptosis, peaking at 3 h and decreasing significantly by 24 h. In contrast, there was enhanced formation of mitophagic vacuoles in the majority of normal hepatocytes of ethanol-treated rats (ETRs), which peaked at 6 h and was maintained up to 24 h based on electron microscopy and TUNEL/LC3 double labelling. Moreover, enhanced mitophagy in ETR hepatocytes was confirmed by increased LC3 puncta formation, and co-localization of Parkin and LC3 with mitochondrial and lysosomal markers. Immunoelectron microscopy demonstrated the localization of PINK1 and Parkin to damaged mitochondria of ETR hepatocytes, which was consistent with co-localization of Parkin with 8-OHdG, a marker of oxidative mitochondrial DNA damage. Furthermore, electron microscopy showed enhanced formation of mitochondrial spheroids in ETR hepatocytes. These data are the first direct morphological evidence linking PINK1-Parkin pathway activation to the enhanced mitophagic response of hepatocytes to ethanol toxicity. Ethanol-induced hepatic mitophagy may be a prosurvival mechanism, which may have therapeutic implications.es
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dc.format.extent17es
dc.identifier.citationHistology and Histopathology, Vol.31, nÂş10, (2016)
dc.identifier.doiDOI: 10.14670/HH-11-747
dc.identifier.issn0213-3911
dc.identifier.issn1699-5848
dc.identifier.urihttp://hdl.handle.net/10201/113525
dc.languageenges
dc.publisherUniversidad de Murcia. Departamento de BiologĂ­a Celular e HistologĂ­aes
dc.relationSin financiaciĂłn externa a la Universidades
dc.rightsinfo:eu-repo/semantics/openAccesses
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectEthanoles
dc.subjectLiveres
dc.subjectMitophagyes
dc.subjectPINK1es
dc.subjectParkines
dc.subject8-OHdGes
dc.subject.otherCDU::6 - Ciencias aplicadas::61 - Medicina::616 - PatologĂ­a. Medicina clĂ­nica. OncologĂ­aes
dc.titleEthanol-induced mitophagy in liver is associated with activation of the PINK1-Parkin pathway triggered by oxidative DNA damagees
dc.typeinfo:eu-repo/semantics/articlees
dspace.entity.typePublicationes
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Histology and histopathology Vol.31,nÂş 10 (2016)