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Yu C, Asadian S, Tigano M. Molecular and cellular consequences of mitochondrial DNA double-stranded breaks. Hum Mol Genet 2024; 33:R12-R18. [PMID: 38779775 PMCID: PMC11112379 DOI: 10.1093/hmg/ddae048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 03/06/2024] [Accepted: 03/08/2024] [Indexed: 05/25/2024] Open
Abstract
Mitochondria are subcellular organelles essential for life. Beyond their role in producing energy, mitochondria govern various physiological mechanisms, encompassing energy generation, metabolic processes, apoptotic events, and immune responses. Mitochondria also contain genetic material that is susceptible to various forms of damage. Mitochondrial double-stranded breaks (DSB) are toxic lesions that the nucleus repairs promptly. Nevertheless, the significance of DSB repair in mammalian mitochondria is controversial. This review presents an updated view of the available research on the consequences of mitochondrial DNA DSB from the molecular to the cellular level. We discuss the crucial function of mitochondrial DNA damage in regulating processes such as senescence, integrated stress response, and innate immunity. Lastly, we discuss the potential role of mitochondrial DNA DSB in mediating the cellular consequences of ionizing radiations, the standard of care in treating solid tumors.
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Affiliation(s)
- Chenxiao Yu
- Department of Pathology and Genomic Medicine, Thomas Jefferson University, 1020 Locust Street, Philadelphia 19107, United States
- Department of Radiotherapy and Oncology, The Second Affiliated Hospital of Soochow University, 199 Renai Road, Suzhou 215123, China
| | - Samieh Asadian
- Tehran University of Medical Sciences, Pour Sina St, Tehran 1416634793, Iran
| | - Marco Tigano
- Department of Pathology and Genomic Medicine, Thomas Jefferson University, 1020 Locust Street, Philadelphia 19107, United States
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2
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Faria-Pereira A, Temido-Ferreira M, Morais VA. BrainPhys Neuronal Media Support Physiological Function of Mitochondria in Mouse Primary Neuronal Cultures. Front Mol Neurosci 2022; 15:837448. [PMID: 35774868 PMCID: PMC9239074 DOI: 10.3389/fnmol.2022.837448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 05/02/2022] [Indexed: 11/28/2022] Open
Abstract
In vitro neuronal cultures are extensively used in the field of neurosciences as they represent an accessible experimental tool for neuronal genetic manipulation, time-lapse imaging, and drug screening. Optimizing the cultivation of rodent primary neuronal cultures led to the development of defined media that support the growth and maintenance of different neuronal types. Recently, a new neuronal medium, BrainPhys (BP), was formulated envisioning the mimicry of brain physiological conditions and suitability for cultured human iPSC-derived neurons and rat primary neurons. However, its advantages in mouse primary neuronal cultures and its effects in neuronal bioenergetics are yet to be demonstrated. In this study, we validated the beneficial use of BP in mouse primary neuronal cultures based on the observation that neuronal cultures in BP media showed enhanced ATP levels, which increased throughout neuronal maturation, a finding that correlates with higher mitochondrial activity and ATP production at later maturation stages, as well as an increased glycolysis response on mitochondrial inhibition and increased mitochondrial fuel flexibility. Taken together, our data demonstrate that BP medium promotes mitochondrial activity along with neuronal maturation of in vitro cultures.
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3
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Wang N, Li J, Xin Q, Xu N. USP30-AS1 contributes to mitochondrial quality control in glioblastoma cells. Biochem Biophys Res Commun 2021; 581:31-37. [PMID: 34653676 DOI: 10.1016/j.bbrc.2021.10.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 09/30/2021] [Accepted: 10/03/2021] [Indexed: 12/26/2022]
Abstract
Glioblastoma is the most serious type of brain cancer with poor prognosis. Here, using the publicly available glioma database, we identified that USP30-AS1, an antisense lncRNA locating on the opposite strand of USP30 locus, is upregulated in human gliomas, particularly in high grade glioma. High level of USP30-AS1 is correlated with poor survival in both primary and recurrent glioma patients. USP30-AS1 regulates mitochondrial homeostasis and mitophagy in glioblastoma cells. Knockdown of USP30-AS1 decreases mitochondrial protein expression and mitochondrial mass, promotes mitochondrial uncoupler-induced mitophagy. However, USP30-AS1 does not regulate USP30 expression in a cis-regulatory manner. In summary, this study proposed that USP30-AS1 may serve as a valuable prognostic marker for gliomas. USP3-AS1 is a negative regulator of mitophagy and the regulatory effect is USP30-independent. USP30-AS1 mediated repression of mitophagy may contribute to the loss of mitochondrial homeostasis and tumor development in glioma.
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MESH Headings
- Brain Neoplasms/genetics
- Brain Neoplasms/metabolism
- Brain Neoplasms/mortality
- Brain Neoplasms/pathology
- Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone/pharmacology
- Cell Line, Tumor
- Computational Biology
- Databases, Genetic
- Disease Progression
- Electron Transport Complex IV/genetics
- Electron Transport Complex IV/metabolism
- Gene Expression Regulation, Neoplastic
- Glioblastoma/genetics
- Glioblastoma/metabolism
- Glioblastoma/mortality
- Glioblastoma/pathology
- Humans
- Mitochondria/drug effects
- Mitochondria/genetics
- Mitochondria/metabolism
- Mitochondrial Precursor Protein Import Complex Proteins/genetics
- Mitochondrial Precursor Protein Import Complex Proteins/metabolism
- Mitochondrial Proteins/genetics
- Mitochondrial Proteins/metabolism
- Mitophagy/drug effects
- Mitophagy/genetics
- Neoplasm Grading
- Neoplasm Recurrence, Local/genetics
- Neoplasm Recurrence, Local/metabolism
- Neoplasm Recurrence, Local/mortality
- Neoplasm Recurrence, Local/pathology
- Neuroglia/drug effects
- Neuroglia/metabolism
- Neuroglia/pathology
- Prognosis
- RNA, Long Noncoding/antagonists & inhibitors
- RNA, Long Noncoding/genetics
- RNA, Long Noncoding/metabolism
- RNA, Small Interfering/genetics
- RNA, Small Interfering/metabolism
- Signal Transduction
- Survival Analysis
- Thiolester Hydrolases/genetics
- Thiolester Hydrolases/metabolism
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Affiliation(s)
- Ningchao Wang
- State Key Laboratory of Chemical Oncogenesis, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China; Open FIESTA Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
| | - Jiao Li
- Department of Neurology, Wuhan Hankou Hospital, Wuhan, 430010, China
| | - Qilei Xin
- State Key Laboratory of Chemical Oncogenesis, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China; Institute of Biopharmaceutical and Health Engineering, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
| | - Naihan Xu
- State Key Laboratory of Chemical Oncogenesis, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China; Open FIESTA Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China; Institute of Biopharmaceutical and Health Engineering, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
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4
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Bernardini C, Algieri C, La Mantia D, Trombetti F, Pagliarani A, Forni M, Nesci S. Vitamin K Vitamers Differently Affect Energy Metabolism in IPEC-J2 Cells. Front Mol Biosci 2021; 8:682191. [PMID: 34109217 PMCID: PMC8184094 DOI: 10.3389/fmolb.2021.682191] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 04/16/2021] [Indexed: 12/30/2022] Open
Abstract
The fat-soluble vitamin K (VK) has long been known as a requirement for blood coagulation, but like other vitamins, has been recently recognized to play further physiological roles, particularly in cell development and homeostasis. Vertebrates cannot de novo synthesize VK, which is essential, and it can only be obtained from the diet or by the activity of the gut microbiota. The IPEC-J2 cell line, obtained from porcine small intestine, which shows strong similarities to the human one, represents an excellent functional model to in vitro study the effect of compounds at the intestinal level. The acute VK treatments on the bioenergetic features of IPEC-J2 cells were evaluated by Seahorse XP Agilent technology. VK exists in different structurally related forms (vitamers), all featured by a naphtoquinone moiety, but with distinct effects on IPEC-J2 energy metabolism. The VK1, which has a long hydrocarbon chain, at both concentrations (5 and 10 μM), increases the cellular ATP production due to oxidative phosphorylation (OXPHOS) by 5% and by 30% through glycolysis. The VK2 at 5 μM only stimulates ATP production by OXPHOS. Conversely, 10 μM VK3, which lacks the long side chain, inhibits OXPHOS by 30% and glycolysis by 45%. However, even if IPEC-J2 cells mainly prefer OXPHOS to glycolysis to produce ATP, the OXPHOS/glycolysis ratio significantly decreases in VK1-treated cells, is unaffected by VK2, and only significantly increased by 10 μM VK3. VK1, at the two concentrations tested, does not affect the mitochondrial bioenergetic parameters, while 5 μM VK2 increases and 5 μM VK3 reduces the mitochondrial respiration (i.e., maximal respiration and spare respiratory capacity). Moreover, 10 μM VK3 impairs OXPHOS, as shown by the increase in the proton leak, namely the proton backward entry to the matrix space, thus pointing out mitochondrial toxicity. Furthermore, in the presence of both VK1 and VK2 concentrations, the glycolytic parameters, namely the glycolytic capacity and the glycolytic reserve, are unaltered. In contrast, the inhibition of glycoATP production by VK3 is linked to the 80% inhibition of glycolysis, resulting in a reduced glycolytic capacity and reserve. These data, which demonstrate the VK ability to differently modulate IPEC-J2 cell energy metabolism according to the different structural features of the vitamers, can mirror VK modulatory effects on the cell membrane features and, as a cascade, on the epithelial cell properties and gut functions: balance of salt and water, macromolecule cleavage, detoxification of harmful compounds, and nitrogen recycling.
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Affiliation(s)
- Chiara Bernardini
- Department of Veterinary Medical Science, University of Bologna, Ozzano Emilia, Italy
| | - Cristina Algieri
- Department of Veterinary Medical Science, University of Bologna, Ozzano Emilia, Italy
| | - Debora La Mantia
- Department of Veterinary Medical Science, University of Bologna, Ozzano Emilia, Italy
| | - Fabiana Trombetti
- Department of Veterinary Medical Science, University of Bologna, Ozzano Emilia, Italy
| | - Alessandra Pagliarani
- Department of Veterinary Medical Science, University of Bologna, Ozzano Emilia, Italy
| | - Monica Forni
- Department of Veterinary Medical Science, University of Bologna, Ozzano Emilia, Italy.,Health Sciences and Technologies-Interdepartmental Center for Industrial Research (CIRI-SDV), Alma Mater Studiorum-University of Bologna, Bologna, Italy
| | - Salvatore Nesci
- Department of Veterinary Medical Science, University of Bologna, Ozzano Emilia, Italy
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Safflor Yellow B Attenuates Ischemic Brain Injury via Downregulation of Long Noncoding AK046177 and Inhibition of MicroRNA-134 Expression in Rats. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:4586839. [PMID: 32566081 PMCID: PMC7292966 DOI: 10.1155/2020/4586839] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 03/11/2020] [Accepted: 04/29/2020] [Indexed: 12/21/2022]
Abstract
Stroke breaks the oxidative balance in the body and causes extra reactive oxygen species (ROS) generation, leading to oxidative stress damage. Long noncoding RNAs (lncRNAs) and microRNAs play pivotal roles in oxidative stress-mediated brain injury. Safflor yellow B (SYB) was able to effectively reduce ischemia-mediated brain damage by increasing antioxidant capacity and inhibiting cell apoptosis. In this study, we investigated the putative involvement of lncRNA AK046177 and microRNA-134 (miR-134) regulation in SYB against ischemia/reperfusion- (I/R-) induced neuronal injury. I/R and oxygen-glucose deprivation/reoxygenation (OGD/R) were established in vivo and in vitro. Cerebral infarct volume, neuronal apoptosis, and protein expression were detected. The effects of SYB on cell activity, cell respiration, nuclear factor erythroid 2-related factor 2 (Nrf2), antioxidant enzymes, and ROS were evaluated. I/R or OGD/R upregulated the expression of AK046177 and miR-134 and subsequently inhibited the activation and expression of CREB, which caused ROS generation and brain/cell injury. SYB attenuated the effects of AK046177, inhibited miR-134 expression, and promoted CREB activation, which in turn promoted Nrf2 expression, and then increased antioxidant capacities, improved cell respiration, and reduced apoptosis. We suggested that the antioxidant effects of SYB were driven by an AK046177/miR-134/CREB-dependent mechanism that inhibited this pathway, and that SYB has potential use in reducing or possibly preventing I/R-induced neuronal injury.
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Zhunina OA, Yabbarov NG, Grechko AV, Yet SF, Sobenin IA, Orekhov AN. Neurodegenerative Diseases Associated with Mitochondrial DNA Mutations. Curr Pharm Des 2020; 26:103-109. [DOI: 10.2174/1381612825666191122091320] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 11/19/2019] [Indexed: 01/23/2023]
Abstract
Mitochondrial dysfunction underlies several human chronic pathologies, including cardiovascular
disorders, cancers and neurodegenerative diseases. Impaired mitochondrial function associated with oxidative
stress can be a result of both nuclear and mitochondrial DNA (mtDNA) mutations. Neurological disorders associated
with mtDNA mutations include mitochondrial encephalomyopathy, chronic progressive external ophthalmoplegia,
neurogenic weakness, and Leigh syndrome. Moreover, mtDNA mutations were shown to play a role in the
development of Parkinson and Alzheimer’s diseases. In this review, current knowledge on the distribution and
possible roles of mtDNA mutations in the onset and development of various neurodegenerative diseases, with
special focus on Parkinson’s and Alzheimer’s diseases has been discussed.
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Affiliation(s)
- Olga A. Zhunina
- Russian Research Center for Molecular Diagnostics and Therapy, Simferopolsky Blvd., 8, 117149, Moscow, Russian Federation
| | - Nikita G. Yabbarov
- Russian Research Center for Molecular Diagnostics and Therapy, Simferopolsky Blvd., 8, 117149, Moscow, Russian Federation
| | - Andrey V. Grechko
- Federal Research and Clinical Center of Intensive Care Medicine and Rehabilitology, 14-3 Solyanka Street, 109240, Moscow, Russian Federation
| | - Shaw-Fang Yet
- Institute of Cellular and System Medicine, National Health Research Institutes, 35 Keyan Road, Zhunan Town, Miaoli County 35053, Taiwan
| | - Igor A. Sobenin
- Laboratory of Medical Genetics, National Medical Research Center of Cardiology, 15A 3rd Cherepkovskaya Street, Moscow 121552, Russian Federation
| | - Alexander N. Orekhov
- Institute of Human Morphology, 3 Tsyurupa Street, Moscow 117418, Russian Federation
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7
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Hung KM, Chen PC, Hsieh HC, Calkins MJ. Mitochondrial defects arise from nucleoside/nucleotide reverse transcriptase inhibitors in neurons: Potential contribution to HIV-associated neurocognitive disorders. Biochim Biophys Acta Mol Basis Dis 2016; 1863:406-413. [PMID: 27840304 DOI: 10.1016/j.bbadis.2016.11.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 11/04/2016] [Accepted: 11/10/2016] [Indexed: 02/07/2023]
Abstract
The cornerstone of current HIV treatment is a class of drugs called nucleoside/nucleotide reverse transcriptase inhibitors (NRTIs). However, patients who receive long term treatment with NRTIs often develop severe side effects, which are related to mitochondrial toxicity. The potential contribution of NRTI-mediated toxicity to HIV-associated neurocognitive disorders (HAND) has not been fully explored. NRTI toxicity is thought to be mediated through mitochondrial DNA polymerase γ (pol γ) inhibition, which impairs mitochondrial DNA (mtDNA) synthesis and leads to various mitochondrial dysfunctions. To evaluate the relationship between NRTI-mediated pol γ inhibition and mitochondrial toxicity in neurons, we systematically investigated mitochondrial regulation in NRTI-treated primary cortical neurons by measuring parameters related to mtDNA content, retrograde signaling responses and mitochondrial homeostasis. The effects of four different NRTIs with variable pol γ inhibitory activity and mitochondrial toxicity were assessed. The strong pol γ inhibitor, ddI, abolished mtDNA synthesis and greatly reduced mtDNA content. However, mtDNA transcription was not as severely affected, and no defects in oxidative phosphorylation were observed. Detrimental effects on mitochondrial respiration and motility were observed after AZT treatment in the absence of mtDNA depletion or inhibition of mtDNA synthesis. The results suggest that individual NRTIs, such as ddI and AZT, have the potential to cause mitochondrial toxicity in neurons. This mitochondrial toxicity would be expected to contribute to neurotoxicity in the central nervous system, and therefore, HAND etiology may be affected by NRTI treatment.
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Affiliation(s)
- Kui-Ming Hung
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan; Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan
| | - Pei-Chun Chen
- Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan
| | - Han-Chieh Hsieh
- Department of Neurology, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan
| | - Marcus J Calkins
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan.
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