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dc.contributor.authorAnzovino, Amy
dc.contributor.authorChiang, Shannon
dc.contributor.authorBrown, Bronwyn E
dc.contributor.authorHawkins, Clare L
dc.contributor.authorRichardson, Des R
dc.contributor.authorHuang, Michael L-H
dc.date.accessioned2021-07-14T00:48:43Z
dc.date.available2021-07-14T00:48:43Z
dc.date.issued2017
dc.identifier.issn0002-9440
dc.identifier.doi10.1016/j.ajpath.2017.08.021
dc.identifier.urihttp://hdl.handle.net/10072/405933
dc.description.abstractNuclear factor–erythroid 2–related factor-2 (Nrf2) is a master regulator of the antioxidant response. However, studies in models of Friedreich ataxia, a neurodegenerative and cardiodegenerative disease associated with oxidative stress, reported decreased Nrf2 expression attributable to unknown mechanisms. Using a mouse conditional frataxin knockout (KO) model in the heart and skeletal muscle, we examined the Nrf2 pathway in these tissues. Frataxin KO results in fatal cardiomyopathy, whereas skeletal muscle was asymptomatic. In the KO heart, protein oxidation and a decreased glutathione/oxidized glutathione ratio were observed, but the opposite was found in skeletal muscle. Decreased total and nuclear Nrf2 and increased levels of its inhibitor, Kelch-like ECH-associated protein 1, were evident in the KO heart, but not in skeletal muscle. Moreover, a mechanism involving activation of the nuclear Nrf2 export/degradation machinery via glycogen synthase kinase-3β (Gsk3β) signaling was demonstrated in the KO heart. This process involved the following: i) increased Gsk3β activation, ii) β-transducin repeat containing E3 ubiquitin protein ligase nuclear accumulation, and iii) Fyn phosphorylation. A corresponding decrease in Nrf2-DNA–binding activity and a general decrease in Nrf2-target mRNA were observed in KO hearts. Paradoxically, protein levels of some Nrf2 antioxidant targets were significantly increased in KO mice. Collectively, cardiac frataxin deficiency reduces Nrf2 levels via two potential mechanisms: increased levels of cytosolic Kelch-like ECH-associated protein 1 and activation of Gsk3β signaling, which decreases nuclear Nrf2. These findings are in contrast to the frataxin-deficient skeletal muscle, where Nrf2 was not decreased.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherElsevier
dc.relation.ispartofpagefrom2858
dc.relation.ispartofpageto2875
dc.relation.ispartofissue12
dc.relation.ispartofjournalThe American Journal of Pathology
dc.relation.ispartofvolume187
dc.subject.fieldofresearchBiomedical and clinical sciences
dc.subject.fieldofresearchcode32
dc.subject.keywordsScience & Technology
dc.subject.keywordsLife Sciences & Biomedicine
dc.subject.keywordsPathology
dc.subject.keywordsANTIOXIDANT-RESPONSE-ELEMENT
dc.subject.keywordsCRM1-DEPENDENT NUCLEAR EXPORT
dc.titleMolecular alterations in a mouse cardiac model of Friedreich ataxia: An impaired Nrf2 response mediated via upregulation of Keap1 and activation of the Gsk3β axis
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationAnzovino, A; Chiang, S; Brown, BE; Hawkins, CL; Richardson, DR; Huang, ML-H, Molecular alterations in a mouse cardiac model of Friedreich ataxia: An impaired Nrf2 response mediated via upregulation of Keap1 and activation of the Gsk3β axis, The American Journal of Pathology, 2017, 187 (12), pp. 2858-2875
dcterms.dateAccepted2017-08-17
dc.date.updated2021-07-14T00:35:35Z
gro.hasfulltextNo Full Text
gro.griffith.authorRichardson, Des R.


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