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Assocation Between Leber's Hereditary Optic Neuropathy and MT-ND1 3460G>A Mutation-Induced Alterations in Mitochondrial Function, Apoptosis, and Mitophagy

PURPOSE: To investigate the molecular mechanism underlying the Leber's hereditary optic neuropathy (LHON)-linked MT-ND1 3460G>A mutation. METHODS: Cybrid cell models were generated by fusing mitochondrial DNA-less ρ(0) cells with enucleated cells from a patient carrying the m.3460G>A muta...

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Autores principales: Zhang, Juanjuan, Ji, Yanchun, Chen, Jie, Xu, Man, Wang, Guoping, Ci, Xiaorui, Lin, Bing, Mo, Jun Q., Zhou, Xiangtian, Guan, Min-Xin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Association for Research in Vision and Ophthalmology 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8322717/
https://www.ncbi.nlm.nih.gov/pubmed/34311469
http://dx.doi.org/10.1167/iovs.62.9.38
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author Zhang, Juanjuan
Ji, Yanchun
Chen, Jie
Xu, Man
Wang, Guoping
Ci, Xiaorui
Lin, Bing
Mo, Jun Q.
Zhou, Xiangtian
Guan, Min-Xin
author_facet Zhang, Juanjuan
Ji, Yanchun
Chen, Jie
Xu, Man
Wang, Guoping
Ci, Xiaorui
Lin, Bing
Mo, Jun Q.
Zhou, Xiangtian
Guan, Min-Xin
author_sort Zhang, Juanjuan
collection PubMed
description PURPOSE: To investigate the molecular mechanism underlying the Leber's hereditary optic neuropathy (LHON)-linked MT-ND1 3460G>A mutation. METHODS: Cybrid cell models were generated by fusing mitochondrial DNA-less ρ(0) cells with enucleated cells from a patient carrying the m.3460G>A mutation and a control subject. The impact of m.3460G>A mutations on oxidative phosphorylation was evaluated using Blue Native gel electrophoresis, and measurements of oxygen consumption were made with an extracellular flux analyzer. Assessment of reactive oxygen species (ROS) production in cell lines was performed by flow cytometry with MitoSOX Red reagent. Assays for apoptosis and mitophagy were undertaken via immunofluorescence analysis. RESULTS: Nineteen Chinese Han pedigrees bearing the m.3460G>A mutation exhibited variable penetrance and expression of LHON. The m.3460G>A mutation altered the structure and function of MT-ND1, as evidenced by reduced MT-ND1 levels in mutant cybrids bearing the mutation. The instability of mutated MT-ND1 manifested as defects in the assembly and activity of complex I, respiratory deficiency, diminished mitochondrial adenosine triphosphate production, and decreased membrane potential, in addition to increased production of mitochondrial ROS in the mutant cybrids carrying the m.3460G>A mutation. The m.3460G>A mutation mediated apoptosis, as evidenced by the elevated release of cytochrome c into the cytosol and increasing levels of the apoptotic-associated proteins BAK, BAX, and PARP, as well as cleaved caspases 3, 7, and 9, in the mutant cybrids. The cybrids bearing the m.3460G>A mutation exhibited reduced levels of autophagy protein light chain 3, accumulation of autophagic substrate P62, and impaired PTEN-induced kinase 1/parkin-dependent mitophagy. CONCLUSIONS: Our findings highlight the critical role of m.3460G>A mutation in the pathogenesis of LHON, manifested by mitochondrial dysfunction and alterations in apoptosis and mitophagy.
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spelling pubmed-83227172021-08-13 Assocation Between Leber's Hereditary Optic Neuropathy and MT-ND1 3460G>A Mutation-Induced Alterations in Mitochondrial Function, Apoptosis, and Mitophagy Zhang, Juanjuan Ji, Yanchun Chen, Jie Xu, Man Wang, Guoping Ci, Xiaorui Lin, Bing Mo, Jun Q. Zhou, Xiangtian Guan, Min-Xin Invest Ophthalmol Vis Sci Biochemistry and Molecular Biology PURPOSE: To investigate the molecular mechanism underlying the Leber's hereditary optic neuropathy (LHON)-linked MT-ND1 3460G>A mutation. METHODS: Cybrid cell models were generated by fusing mitochondrial DNA-less ρ(0) cells with enucleated cells from a patient carrying the m.3460G>A mutation and a control subject. The impact of m.3460G>A mutations on oxidative phosphorylation was evaluated using Blue Native gel electrophoresis, and measurements of oxygen consumption were made with an extracellular flux analyzer. Assessment of reactive oxygen species (ROS) production in cell lines was performed by flow cytometry with MitoSOX Red reagent. Assays for apoptosis and mitophagy were undertaken via immunofluorescence analysis. RESULTS: Nineteen Chinese Han pedigrees bearing the m.3460G>A mutation exhibited variable penetrance and expression of LHON. The m.3460G>A mutation altered the structure and function of MT-ND1, as evidenced by reduced MT-ND1 levels in mutant cybrids bearing the mutation. The instability of mutated MT-ND1 manifested as defects in the assembly and activity of complex I, respiratory deficiency, diminished mitochondrial adenosine triphosphate production, and decreased membrane potential, in addition to increased production of mitochondrial ROS in the mutant cybrids carrying the m.3460G>A mutation. The m.3460G>A mutation mediated apoptosis, as evidenced by the elevated release of cytochrome c into the cytosol and increasing levels of the apoptotic-associated proteins BAK, BAX, and PARP, as well as cleaved caspases 3, 7, and 9, in the mutant cybrids. The cybrids bearing the m.3460G>A mutation exhibited reduced levels of autophagy protein light chain 3, accumulation of autophagic substrate P62, and impaired PTEN-induced kinase 1/parkin-dependent mitophagy. CONCLUSIONS: Our findings highlight the critical role of m.3460G>A mutation in the pathogenesis of LHON, manifested by mitochondrial dysfunction and alterations in apoptosis and mitophagy. The Association for Research in Vision and Ophthalmology 2021-07-26 /pmc/articles/PMC8322717/ /pubmed/34311469 http://dx.doi.org/10.1167/iovs.62.9.38 Text en Copyright 2021 The Authors https://creativecommons.org/licenses/by-nc-nd/4.0/This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
spellingShingle Biochemistry and Molecular Biology
Zhang, Juanjuan
Ji, Yanchun
Chen, Jie
Xu, Man
Wang, Guoping
Ci, Xiaorui
Lin, Bing
Mo, Jun Q.
Zhou, Xiangtian
Guan, Min-Xin
Assocation Between Leber's Hereditary Optic Neuropathy and MT-ND1 3460G>A Mutation-Induced Alterations in Mitochondrial Function, Apoptosis, and Mitophagy
title Assocation Between Leber's Hereditary Optic Neuropathy and MT-ND1 3460G>A Mutation-Induced Alterations in Mitochondrial Function, Apoptosis, and Mitophagy
title_full Assocation Between Leber's Hereditary Optic Neuropathy and MT-ND1 3460G>A Mutation-Induced Alterations in Mitochondrial Function, Apoptosis, and Mitophagy
title_fullStr Assocation Between Leber's Hereditary Optic Neuropathy and MT-ND1 3460G>A Mutation-Induced Alterations in Mitochondrial Function, Apoptosis, and Mitophagy
title_full_unstemmed Assocation Between Leber's Hereditary Optic Neuropathy and MT-ND1 3460G>A Mutation-Induced Alterations in Mitochondrial Function, Apoptosis, and Mitophagy
title_short Assocation Between Leber's Hereditary Optic Neuropathy and MT-ND1 3460G>A Mutation-Induced Alterations in Mitochondrial Function, Apoptosis, and Mitophagy
title_sort assocation between leber's hereditary optic neuropathy and mt-nd1 3460g>a mutation-induced alterations in mitochondrial function, apoptosis, and mitophagy
topic Biochemistry and Molecular Biology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8322717/
https://www.ncbi.nlm.nih.gov/pubmed/34311469
http://dx.doi.org/10.1167/iovs.62.9.38
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