1
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Rondeau JD, Van de Velde JA, Bouidida Y, Sonveaux P. Subclinical dose irradiation triggers human breast cancer migration via mitochondrial reactive oxygen species. Cancer Metab 2024; 12:20. [PMID: 38978126 PMCID: PMC11229245 DOI: 10.1186/s40170-024-00347-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Accepted: 06/26/2024] [Indexed: 07/10/2024] Open
Abstract
BACKGROUND Despite technological advances in radiotherapy, cancer cells at the tumor margin and in diffusive infiltrates can receive subcytotoxic doses of photons. Even if only a minority of cancer cells are concerned, phenotypic consequences could be important considering that mitochondrial DNA (mtDNA) is a primary target of radiation and that damage to mtDNA can persist. In turn, mitochondrial dysfunction associated with enhanced mitochondrial ROS (mtROS) production could promote cancer cell migration out of the irradiation field in a natural attempt to escape therapy. In this study, using MCF7 and MDA-MB-231 human breast cancer cells as models, we aimed to elucidate the molecular mechanisms supporting a mitochondrial contribution to cancer cell migration induced by subclinical doses of irradiation (< 2 Gy). METHODS Mitochondrial dysfunction was tested using mtDNA multiplex PCR, oximetry, and ROS-sensitive fluorescent reporters. Migration was tested in transwells 48 h after irradiation in the presence or absence of inhibitors targeting specific ROS or downstream effectors. Among tested inhibitors, we designed a mitochondria-targeted version of human catalase (mtCAT) to selectively inactivate mitochondrial H2O2. RESULTS Photon irradiation at subclinical doses (0.5 Gy for MCF7 and 0.125 Gy for MDA-MB-231 cells) sequentially affected mtDNA levels and/or integrity, increased mtROS production, increased MAP2K1/MEK1 gene expression, activated ROS-sensitive transcription factors NF-κB and AP1 and stimulated breast cancer cell migration. Targeting mtROS pharmacologically by MitoQ or genetically by mtCAT expression mitigated migration induced by a subclinical dose of irradiation. CONCLUSION Subclinical doses of photon irradiation promote human breast cancer migration, which can be countered by selectively targeting mtROS.
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Affiliation(s)
- Justin D Rondeau
- Pole of Pharmacology and Therapeutics, Institut de Recherche Expérimentale et Clinique (IREC), Université catholique de Louvain (UCLouvain), Brussels, 1200, Belgium
| | - Justine A Van de Velde
- Pole of Pharmacology and Therapeutics, Institut de Recherche Expérimentale et Clinique (IREC), Université catholique de Louvain (UCLouvain), Brussels, 1200, Belgium
| | - Yasmine Bouidida
- Pole of Pharmacology and Therapeutics, Institut de Recherche Expérimentale et Clinique (IREC), Université catholique de Louvain (UCLouvain), Brussels, 1200, Belgium
| | - Pierre Sonveaux
- Pole of Pharmacology and Therapeutics, Institut de Recherche Expérimentale et Clinique (IREC), Université catholique de Louvain (UCLouvain), Brussels, 1200, Belgium.
- WELBIO Department, WEL Research Institute, Wavre, 1300, Belgium.
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2
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Xie Z, Yu G, Yun Y, Zhang X, Shen M, Jia M, Li A, Zhang H, Wang T, Zhang J, Zhang L. Effects of bamboo leaf extract on energy metabolism, antioxidant capacity, and biogenesis of small intestine mitochondria in broilers. J Anim Sci 2023; 101:skac391. [PMID: 36440554 PMCID: PMC9833010 DOI: 10.1093/jas/skac391] [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: 08/09/2022] [Accepted: 11/25/2022] [Indexed: 11/29/2022] Open
Abstract
The present study was carried out to investigate the effects of bamboo leaf extract (BLE) on energy metabolism, antioxidant capacity, and biogenesis of broilers' small intestine mitochondria. A total of 384 one-day-old male Arbor Acres broiler chicks were randomly divided into four groups with six replicates each for 42 d. The control group was fed a basal diet, whereas the BLE1, BLE2, and BLE3 groups consumed basal diets with 1.0, 2.0, and 4.0 g/kg of BLE, respectively. Some markers of mitochondrial energy metabolism including isocitrate dehydrogenase, α-ketoglutarate dehydrogenase, and malate dehydrogenase and some markers of redox system including total superoxide dismutase, malondialdehyde, and glutathione were measured by commercial colorimetric kits. Mitochondrial and cellular antioxidant genes, mitochondrial biogenesis-related genes, and mitochondrial DNA copy number were measured by quantitative real-time-polymerase chain reaction (qRT-PCR). Data were analyzed using the SPSS 19.0, and differences were considered as significant at P < 0.05. BLE supplementation linearly increased jejunal mitochondrial isocitrate dehydrogenase (P < 0.05) and total superoxide dismutase (P < 0.05) activity. The ileal manganese superoxide dismutase mRNA expression was linearly affected by increased dietary BLE supplementation (P < 0.05). Increasing BLE supplementation linearly increased jejunal sirtuin 1 (P < 0.05) and nuclear respiratory factor 1 (P < 0.05) mRNA expression. Linear (P < 0.05) and quadratic (P < 0.05) responses of the ileal nuclear respiratory factor 2 mRNA expression occurred with increased dietary BLE levels. In conclusion, BLE supplementation was beneficial to the energy metabolism, antioxidant capacity, and biogenesis of small intestine mitochondria in broilers. The dose of 4.0 g/kg BLE demonstrated the best effects.
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Affiliation(s)
- Zechen Xie
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Ge Yu
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Yang Yun
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Xin Zhang
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Mingming Shen
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Minghui Jia
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Anqi Li
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Hao Zhang
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Tian Wang
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Jingfei Zhang
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
| | - Lili Zhang
- College of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangsu 210095, P. R. China
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3
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Tomczyk MM, Cheung KG, Xiang B, Tamanna N, Fonseca Teixeira AL, Agarwal P, Kereliuk SM, Spicer V, Lin L, Treberg J, Tong Q, Dolinsky VW. Mitochondrial Sirtuin-3 (SIRT3) Prevents Doxorubicin-Induced Dilated Cardiomyopathy by Modulating Protein Acetylation and Oxidative Stress. Circ Heart Fail 2022; 15:e008547. [PMID: 35418250 PMCID: PMC9117478 DOI: 10.1161/circheartfailure.121.008547] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND High doses of doxorubicin put cancer patients at risk for developing dilated cardiomyopathy. Previously, we showed that doxorubicin treatment decreases SIRT3 (sirtuin 3), the main mitochondrial deacetylase and increases protein acetylation in rat cardiomyocytes. Here, we hypothesize that SIRT3 expression can attenuate doxorubicin induced dilated cardiomyopathy in vivo by preventing the acetylation of mitochondrial proteins. METHODS Nontransgenic, M3-SIRT3 (truncated SIRT3; short isoform), and M1-SIRT3 (full-length SIRT3; mitochondrial localized) transgenic mice were treated with doxorubicin for 4 weeks (8 mg/kg body weight per week). Echocardiography was performed to assess cardiac structure and function and validated by immunohistochemistry and immunofluorescence (n=4-10). Mass spectrometry was performed on cardiac mitochondrial peptides in saline (n=6) and doxorubicin (n=5) treated hearts. Validation was performed in doxorubicin treated primary rat and human induced stem cell derived cardiomyocytes transduced with adenoviruses for M3-SIRT3 and M1-SIRT3 and deacetylase deficient mutants (n=4-10). RESULTS Echocardiography revealed that M3-SIRT3 transgenic mice were partially resistant to doxorubicin induced changes to cardiac structure and function whereas M1-SIRT3 expression prevented cardiac remodeling and dysfunction. In doxorubicin hearts, 37 unique acetylation sites on mitochondrial proteins were altered. Pathway analysis revealed these proteins are involved in energy production, fatty acid metabolism, and oxidative stress resistance. Increased M1-SIRT3 expression in primary rat and human cardiomyocytes attenuated doxorubicin-induced superoxide formation, whereas deacetylase deficient mutants were unable to prevent oxidative stress. CONCLUSIONS Doxorubicin reduced SIRT3 expression and markedly affected the cardiac mitochondrial acetylome. Increased M1-SIRT3 expression in vivo prevented doxorubicin-induced cardiac dysfunction, suggesting that SIRT3 could be a potential therapeutic target for mitigating doxorubicin-induced dilated cardiomyopathy.
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Affiliation(s)
- Mateusz M Tomczyk
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme of the Children's Hospital Research Institute of Manitoba' Winnipeg' Canada (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.).,Department of Pharmacology and Therapeutics (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.), University of Manitoba, Winnipeg, Canada.,Rady Faculty of Health Science, College of Medicine (M.M.T., K.G.C., B.X., P.A., S.M.K., V.S., V.W.D.), University of Manitoba, Winnipeg, Canada
| | - Kyle G Cheung
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme of the Children's Hospital Research Institute of Manitoba' Winnipeg' Canada (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.).,Department of Pharmacology and Therapeutics (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.), University of Manitoba, Winnipeg, Canada.,Rady Faculty of Health Science, College of Medicine (M.M.T., K.G.C., B.X., P.A., S.M.K., V.S., V.W.D.), University of Manitoba, Winnipeg, Canada
| | - Bo Xiang
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme of the Children's Hospital Research Institute of Manitoba' Winnipeg' Canada (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.).,Department of Pharmacology and Therapeutics (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.), University of Manitoba, Winnipeg, Canada.,Rady Faculty of Health Science, College of Medicine (M.M.T., K.G.C., B.X., P.A., S.M.K., V.S., V.W.D.), University of Manitoba, Winnipeg, Canada
| | - Nahid Tamanna
- Department of Biological Sciences (N.T., A.L.F.T., J.T.), University of Manitoba, Winnipeg, Canada
| | - Ana L Fonseca Teixeira
- Department of Biological Sciences (N.T., A.L.F.T., J.T.), University of Manitoba, Winnipeg, Canada
| | - Prasoon Agarwal
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme of the Children's Hospital Research Institute of Manitoba' Winnipeg' Canada (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.).,Department of Pharmacology and Therapeutics (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.), University of Manitoba, Winnipeg, Canada.,Rady Faculty of Health Science, College of Medicine (M.M.T., K.G.C., B.X., P.A., S.M.K., V.S., V.W.D.), University of Manitoba, Winnipeg, Canada.,KTH Royal Institute of Technology, School of Electrical Engineering and Computer Science, Stockholm, Sweden (P.A.).,Science for Life Laboratory, Solna, Sweden (P.A.)
| | - Stephanie M Kereliuk
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme of the Children's Hospital Research Institute of Manitoba' Winnipeg' Canada (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.).,Department of Pharmacology and Therapeutics (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.), University of Manitoba, Winnipeg, Canada.,Rady Faculty of Health Science, College of Medicine (M.M.T., K.G.C., B.X., P.A., S.M.K., V.S., V.W.D.), University of Manitoba, Winnipeg, Canada
| | - Victor Spicer
- Department of Internal Medicine (V.S.), University of Manitoba, Winnipeg, Canada.,Rady Faculty of Health Science, College of Medicine (M.M.T., K.G.C., B.X., P.A., S.M.K., V.S., V.W.D.), University of Manitoba, Winnipeg, Canada.,Manitoba Center for Proteomics and Systems Biology, Winnipeg, Canada (V.S.)
| | - Ligen Lin
- Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX (L.L., Q.T.).,Institute of Chinese Medical Sciences, University of Macau, China (L.L.)
| | - Jason Treberg
- Department of Biological Sciences (N.T., A.L.F.T., J.T.), University of Manitoba, Winnipeg, Canada
| | - Qiang Tong
- Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX (L.L., Q.T.)
| | - Vernon W Dolinsky
- Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme of the Children's Hospital Research Institute of Manitoba' Winnipeg' Canada (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.).,Department of Pharmacology and Therapeutics (M.M.T., K.G.C., B.X., P.A., S.M.K., V.W.D.), University of Manitoba, Winnipeg, Canada.,Rady Faculty of Health Science, College of Medicine (M.M.T., K.G.C., B.X., P.A., S.M.K., V.S., V.W.D.), University of Manitoba, Winnipeg, Canada
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4
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Starr VJ, Dzialowski EM. Developing chicken cardiac muscle mitochondria are resistant to variations in incubation oxygen levels. Curr Res Physiol 2022; 5:151-157. [PMID: 35345510 PMCID: PMC8956876 DOI: 10.1016/j.crphys.2022.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 03/05/2022] [Accepted: 03/14/2022] [Indexed: 11/25/2022] Open
Abstract
Background Chronic exposure to hypoxia during vertebrate development can produce abnormal cardiovascular morphology and function. The aim of this study was to examine cardiac mitochondria function in an avian model, the chicken, in response to embryonic development under hypoxic (15% O2), normoxic (21% O2), or hyperoxic (40% O2) incubation conditions. Methods Chicken embryos were incubated in hypoxia, normoxia, or hyperoxia beginning on day 5 of incubation through hatching. Cardiac mitochondria oxygen flux and reactive oxygen species production were measured in permeabilized cardiac fibers from externally pipped and 1-day post hatchlings. Results Altering oxygen during development had a large effect on body and heart masses of externally pipped embryos and 1-day old hatchlings. Hypoxic animals had smaller body masses and absolute heart masses, but proportionally similar sized hearts compared to normoxic animals during external pipping. Hyperoxic animals were larger with larger hearts than normoxic animals during external pipping. Mitochondrial oxygen flux in permeabilized cardiac muscle fibers revealed limited effects of developing under altered oxygen conditions, with only oxygen flux through cytochrome oxidase being lower in hypoxic hearts compared with hyperoxic hearts. Oxygen flux in leak and oxidative phosphorylation states were not affected by developmental oxygen levels. Mitochondrial reactive oxygen species production under leak and oxidative phosphorylation states studied did not differ between any developmental oxygen treatment. Conclusions These results suggest that cardiac mitochondria function of the developing chicken is not altered by developing in ovo under different oxygen levels. Chicken heart mass is influenced by oxygen availability during development. Cardiac mitochondria respiration was unchanged by developing under hypoxic or hyperoxic oxygen stress. Cardiac mitochondria ROS production was not altered by developmental oxygen stress.
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Key Words
- AA, Antimycin A
- ADP, adenosine diphosphate
- COX, cytochrome oxidase
- Cardiac mitochondria
- Chicken
- EP, external pipping
- GMP, glutamate, malate, and pyruvate
- Hyperoxia
- Hypoxia
- IP, internal pipping
- LEAK, mitochondrial leak respiration
- OMY, oligomycin
- OXPHOS, mitochondrial oxidative phosphorylation
- ROS, reactive oxygen species
- ROT, rotenone
- Reactive oxygen species
- S, succinate
- TMPD, N,N,N’,N’-tetramethyl-p-phenylenediamine
- dph, days post hatching
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Affiliation(s)
- Vanessa J Starr
- Developmental Integrative Biology, Department of Biological Sciences, 1155 Union Circle #305220, University of North Texas, Denton, TX, 76203, USA
| | - Edward M Dzialowski
- Developmental Integrative Biology, Department of Biological Sciences, 1155 Union Circle #305220, University of North Texas, Denton, TX, 76203, USA
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5
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Boël M, Veyrunes F, Durieux AC, Freyssenet D, Voituron Y, Roussel D. Does high mitochondrial efficiency carry an oxidative cost? The case of the African pygmy mouse (Mus mattheyi). Comp Biochem Physiol A Mol Integr Physiol 2021; 264:111111. [PMID: 34748935 DOI: 10.1016/j.cbpa.2021.111111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/01/2021] [Accepted: 11/01/2021] [Indexed: 10/19/2022]
Abstract
Skeletal muscle mitochondria of the African pygmy mouse Mus mattheyi exhibit markedly reduced oxygen consumption and ATP synthesis rates but a higher mitochondrial efficiency than what would be expected from allometric trends. In the present study, we assessed whether such reduction of mitochondrial activity in M. mattheyi can limit the oxidative stress associated with an increased generation of mitochondrial reactive oxygen species. We conducted a comparative study of mitochondrial oxygen consumption, H2O2 release, and electron leak (%H2O2/O) in skeletal muscle mitochondria isolated from the extremely small African pygmy mouse (M. mattheyi, ~5 g) and Mus musculus, which is a larger Mus species (~25 g). Mitochondria were energized with pyruvate, malate, and succinate, after which fluxes were measured at different steady-state rates of oxidative phosphorylation. Overall, M. mattheyi exhibited lower oxidative activity and higher electron leak than M. musculus, while the H2O2 release did not differ significantly between these two Mus species. We further found that the high coupling efficiency of skeletal muscle mitochondria from M. mattheyi was associated with high electron leak. Nevertheless, data also show that, despite the higher electron leak, the lower mitochondrial respiratory capacity of M. mattheyi limits the cost of a net increase in H2O2 release, which is lower than that expected for a mammals of this size.
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Affiliation(s)
- Mélanie Boël
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69622 Villeurbanne, France.
| | - Frédéric Veyrunes
- Université Montpellier, IRD, EPHE, CNRS, UMR 5554 Institut des Sciences de l'Evolution de Montpellier, F-34095 Montpellier, France
| | - Anne-Cécile Durieux
- Inter-University Laboratory of Human Movement Biology, Univ Lyon, Université Jean Monnet Saint-Etienne, F-42023 Saint-Etienne, France
| | - Damien Freyssenet
- Inter-University Laboratory of Human Movement Biology, Univ Lyon, Université Jean Monnet Saint-Etienne, F-42023 Saint-Etienne, France
| | - Yann Voituron
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69622 Villeurbanne, France
| | - Damien Roussel
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69622 Villeurbanne, France.
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6
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Treberg JR. Review: Using isolated mitochondria to investigate mitochondrial hydrogen peroxide metabolism. Comp Biochem Physiol B Biochem Mol Biol 2021; 256:110614. [PMID: 33965616 DOI: 10.1016/j.cbpb.2021.110614] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 04/20/2021] [Accepted: 05/04/2021] [Indexed: 12/13/2022]
Abstract
Mitochondria are recognized as centrally important to cellular reactive oxygen species (ROS), both as a potential source and due to their substantial antioxidant capacity. While much of the initial ROS formed by mitochondria is superoxide, this is rapidly converted to hydrogen peroxide (H2O2) which more readily crosses membranes making H2O2 important in both redox signalling mechanisms and conditions of oxidative stress. Here I outline our studies on mitochondrial H2O2 metabolism with a focus on some of the challenges and strategies involved with developing an integrated model of mitochondria being intrinsic regulators of H2O2. This view of mitochondria as regulators of H2O2 goes beyond the simpler contention of them being net producers or consumers. Moreover, the integration of both consumption and production can then be tied to a putative mechanism linking energy sensing at the level of the mitochondrial protonmotive force. This mechanism would provide a means of mitochondria communicating their energetic status the extramitochondrial compartment via local H2O2 concentrations. I conclude by explaining how these concepts developed using rodent muscle as a model have high relevance and applicability to comparative studies.
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Affiliation(s)
- Jason R Treberg
- Department of Biological Sciences, University of Manitoba Winnipeg, MB R3T 2N2, Canada.
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7
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Ghiselli F, Iannello M, Piccinini G, Milani L. Bivalve molluscs as model systems for studying mitochondrial biology. Integr Comp Biol 2021; 61:1699-1714. [PMID: 33944910 DOI: 10.1093/icb/icab057] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The class Bivalvia is a highly successful and ancient taxon including ∼25,000 living species. During their long evolutionary history bivalves adapted to a wide range of physicochemical conditions, habitats, biological interactions, and feeding habits. Bivalves can have strikingly different size, and despite their apparently simple body plan, they evolved very different shell shapes, and complex anatomic structures. One of the most striking features of this class of animals is their peculiar mitochondrial biology: some bivalves have facultatively anaerobic mitochondria that allow them to survive prolonged periods of anoxia/hypoxia. Moreover, more than 100 species have now been reported showing the only known evolutionarily stable exception to the strictly maternal inheritance of mitochondria in animals, named doubly uniparental inheritance. Mitochondrial activity is fundamental to eukaryotic life, and thanks to their diversity and uncommon features, bivalves represent a great model system to expand our knowledge about mitochondrial biology, so far limited to a few species. We highlight recent works studying mitochondrial biology in bivalves at either genomic or physiological level. A link between these two approaches is still missing, and we believe that an integrated approach and collaborative relationships are the only possible ways to be successful in such endeavour.
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Affiliation(s)
- Fabrizio Ghiselli
- Department of Biological, Geological, and Environmental Sciences, University of Bologna, Italy
| | - Mariangela Iannello
- Department of Biological, Geological, and Environmental Sciences, University of Bologna, Italy
| | - Giovanni Piccinini
- Department of Biological, Geological, and Environmental Sciences, University of Bologna, Italy
| | - Liliana Milani
- Department of Biological, Geological, and Environmental Sciences, University of Bologna, Italy
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8
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Isei MO, Stevens D, Kamunde C. Temperature rise and copper exposure reduce heart mitochondrial reactive oxygen species scavenging capacity. Comp Biochem Physiol C Toxicol Pharmacol 2021; 243:108999. [PMID: 33556536 DOI: 10.1016/j.cbpc.2021.108999] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 01/22/2021] [Accepted: 02/01/2021] [Indexed: 12/14/2022]
Abstract
Mitochondria produce and scavenge reactive oxygen species (ROS); however, whether oxidative distress due to exogenous stress arises from excessive production or impaired scavenging remains unclear. We assessed the effect of copper (Cu) and thermal stress on kinetics of ROS (H2O2) consumption in mitochondria isolated from fish heart. Mitochondria were energized with succinate, glutamate-malate or palmitoylcarnitine (PC) and incubated with 1-25 μM Cu at 11 (control) and 23 °C. We found that H2O2 consumption capacity of heart mitochondria varies with substrate and is additively reduced by temperature rise and Cu. While Cu is a potent inhibitor of H2O2 consumption in mitochondria oxidizing glutamate-malate and succinate, mitochondria oxidizing PC are resistant to the inhibitory effect of the metal. Moreover, the sensitivity of H2O2 consumption pathways to Cu depend on the substrate and are greatly impaired during oxidation of glutamate-malate. Pharmacological manipulation of mitochondrial antioxidant systems revealed that NADPH-dependent peroxidase systems are the centerpieces of ROS scavenging in heart mitochondria, with the glutathione-dependent pathway being the most prominent while catalase played a minimal role. Surprisingly, Cu is as efficacious in inhibiting thioredoxin-dependent peroxidase pathway as auranofin, a selective inhibitor of thioredoxin reductase. Taken together, our study uncovered unique mechanisms by which Cu alters mitochondrial H2O2 homeostasis including its ability to inhibit specific mitochondrial ROS scavenging pathways on a par with conventional inhibitors. Importantly, because of additive inhibitory effect on mitochondrial ROS removal mechanisms, hearts of organisms jointly exposed to Cu and thermal stress are likely at increased risk of oxidative distress.
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Affiliation(s)
- Michael O Isei
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada
| | - Don Stevens
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada
| | - Collins Kamunde
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada.
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9
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Ximenes VF, Ximenes TP, Morgon NH, de Souza AR. Taurine Chloramine and Hydrogen Peroxide as a Potential Source of Singlet Oxygen for Topical Application. Photochem Photobiol 2021; 97:963-970. [PMID: 33657673 DOI: 10.1111/php.13410] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 02/23/2021] [Accepted: 02/28/2021] [Indexed: 11/30/2022]
Abstract
Singlet oxygen (1 O2 ) is the "active principle" in photodynamic therapy. Taurine chloramine (Tau-NHCl) and hydrogen peroxide (H2 O2 ) are well-tolerated and widely used antiseptics. Due to its mild oxidizing features and stability, Tau-NHCl can be directly used to treat skin diseases. We found that a diluted aqueous mixture of Tau-NHCl and H2 O2 acts as a slow and long-lasting potential source of 1 O2 . The reactions were studied by luminol-enhanced chemiluminescence. Evidence of the formation of 1 O2 was obtained using deuterium oxide, sodium azide and 9,10-Anthracenediyl-bis(methylene)dimalonic acid, a chemical trap of 1 O2 . The reaction was optimized, and a mechanism was proposed, including theoretical calculations at B3LYP/6-311++G(3df,2p) level of theory, adding D3Bj empirical dispersion and SMD (Water) solvent effects. Chloramines produced by the reactions between HOCl and L-alanine, 3-amino-1-propanesulfonic acid and gamma-aminobutyric acid were also prepared, and their reactivity and stability were compared with Tau-NHCl. We found that Tau-NHCl is more stable and adequate for the production of 1 O2 . In conclusion, we propose applying these drugs combination as a potential source of 1 O2 with applications for skin diseases treatment.
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Affiliation(s)
- Valdecir F Ximenes
- Department of Chemistry, Faculty of Sciences, UNESP - São Paulo State University, Bauru, São Paulo, Brazil
| | - Thomaz P Ximenes
- Department of Chemistry, Faculty of Sciences, UNESP - São Paulo State University, Bauru, São Paulo, Brazil
| | - Nelson H Morgon
- Department of Physical Chemistry, Institute of Chemistry, Campinas State University (UNICAMP), Campinas, São Paulo, Brazil
| | - Aguinaldo R de Souza
- Department of Chemistry, Faculty of Sciences, UNESP - São Paulo State University, Bauru, São Paulo, Brazil
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10
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Voituron Y, Boël M, Roussel D. Mitochondrial threshold for H 2O 2 release in skeletal muscle of mammals. Mitochondrion 2020; 54:85-91. [PMID: 32738356 DOI: 10.1016/j.mito.2020.07.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 07/08/2020] [Accepted: 07/27/2020] [Indexed: 11/25/2022]
Abstract
The aim of the study was to evaluate the interplay between mitochondrial respiration and H2O2 release during the transition from basal non-phosphorylating to maximal phosphorylating states. We conducted a large scale comparative study of mitochondrial oxygen consumption, H2O2 release and electron leak (% H2O2/O) in skeletal muscle mitochondria isolated from mammal species ranging from 7 g to 500 kg. Mitochondrial fluxes were measured at different steady state rates in presence of pyruvate, malate, and succinate as respiratory substrates. Every species exhibited a burst of H2O2 release from skeletal muscle mitochondria at a low rate of oxidative phosphorylation, essentially once the activity of mitochondrial oxidative phosphorylation reached 26% of the maximal respiration. This threshold for ROS generation thus appears as a general characteristic of skeletal muscle mitochondria in mammals. These findings may have implications in situations promoting succinate accumulation within mitochondria, such as ischemia or hypoxia.
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Affiliation(s)
- Yann Voituron
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, F-69622 Villeurbanne, France.
| | - Mélanie Boël
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, F-69622 Villeurbanne, France
| | - Damien Roussel
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, F-69622 Villeurbanne, France
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11
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Borowiec BG, Scott GR. Hypoxia acclimation alters reactive oxygen species homeostasis and oxidative status in estuarine killifish ( Fundulus heteroclitus). J Exp Biol 2020; 223:jeb222877. [PMID: 32457064 DOI: 10.1242/jeb.222877] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 05/20/2020] [Indexed: 01/10/2023]
Abstract
Hypoxia is common in aquatic environments, and exposure to hypoxia followed by re-oxygenation is often believed to induce oxidative stress. However, there have been relatively few studies of reactive oxygen species (ROS) homeostasis and oxidative status in fish that experience natural hypoxia-re-oxygenation cycles. We examined how exposure to acute hypoxia (2 kPa O2) and subsequent re-oxygenation (to 20 kPa O2) affects redox status, oxidative damage and anti-oxidant defenses in estuarine killifish (Fundulus heteroclitus), and whether these effects were ameliorated or potentiated by prolonged (28 days) acclimation to either constant hypoxia or intermittent cycles of nocturnal hypoxia (12 h:12 h normoxia:hypoxia). Acute hypoxia and re-oxygenation led to some modest and transient changes in redox status, increases in oxidized glutathione, depletion of scavenging capacity and oxidative damage to lipids in skeletal muscle. The liver had greater scavenging capacity, total glutathione concentrations and activities of anti-oxidant enzymes (catalase, glutathione peroxidase) than muscle, and generally experienced less variation in glutathiones and lipid peroxidation. Unexpectedly, acclimation to constant hypoxia or intermittent hypoxia led to a more oxidizing redox status (muscle and liver) and it increased oxidized glutathione (muscle). However, hypoxia-acclimated fish exhibited little to no oxidative damage (as reflected by lipid peroxidation and aconitase activity), in association with improvements in scavenging capacity and catalase activity in muscle. We conclude that hypoxia acclimation leads to adjustments in ROS homeostasis and oxidative status that do not reflect oxidative stress, but may instead be part of the suite of responses that killifish use to cope with chronic hypoxia.
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Affiliation(s)
| | - Graham R Scott
- Department of Biology, McMaster University, Hamilton, ON, Canada, L8S 4L8
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12
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Isei MO, Kamunde C. Effects of copper and temperature on heart mitochondrial hydrogen peroxide production. Free Radic Biol Med 2020; 147:114-128. [PMID: 31825803 DOI: 10.1016/j.freeradbiomed.2019.12.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 12/05/2019] [Accepted: 12/05/2019] [Indexed: 11/19/2022]
Abstract
High energy demand for continuous mechanical work and large number of mitochondria predispose the heart to excessive reactive oxygen species (ROS) production that may precipitate oxidative stress and heart failure. While mitochondria have been proposed as a unifying cellular target and driver of adverse effects induced by diverse stressful states, there is limited understanding of how heart mitochondrial ROS homeostasis is affected by combinations of stress factors. Thus, we probed the effect of copper (Cu) and thermal stress on ROS (as hydrogen peroxide, H2O2) emission and elucidated the effects of Cu on ROS production sites in rainbow trout heart mitochondria using the Amplex UltraRed-horseradish peroxidase detection system optimized for our model. Mitochondria oxidizing malate-glutamate or succinate were incubated at 4, 11 (control) and 23 °C and exposed to a range (1-100 μM) of Cu concentrations. We found that the rates and patterns of H2O2 emission depended on substrate type, Cu concentration and temperature. In mitochondria oxidizing malate-glutamate, Cu increased the rate of H2O2 emission with a spike at 1 μM while temperature had no effect. In contrast, both temperature and Cu increased the rate of H2O2 emission in mitochondria oxidizing succinate with a prominent spike at 25 μM Cu. The rates of H2O2 emission at the three temperatures during the spike imposed by 25 μM Cu were of the order 11 > 23 > 4 °C. Interestingly, 5 μM Cu supressed H2O2 emission in mitochondria oxidizing succinate or malate-glutamate suggesting a common mechanism of action independent of substrate type. In the absence of Cu, the site-specific capacities of H2O2 emission were: complex III outer ubiquinone binding site (site IIIQo) > complex II flavin site (site IIF) ≥ complex I flavin site (site IF) > complex I ubiquinone-binding site (site IQ). Rotenone marginally increased succinate-driven H2O2 emission suggesting either the absence of reverse electron transport (RET)-driven ROS production at site IQ or masking of the expected rotenone response (reduction) by H2O2 produced from other sites. Cu acted at multiple sites in the electron transport system resulting in different site-specific H2O2 emission responses depending on the concentration. Specifically, site IF H2O2 emission was suppressed by Cu concentration-dependently while H2O2 emission by site IIF was inhibited and stimulated by low and high concentrations of Cu, respectively. Additionally, emission from site IIIQo was stimulated by low and inhibited by high Cu concentrations. Overall, our study unveiled distinctive effects and sites of modulation of mitochondrial ROS production by Cu with implications for cardiac redox signaling networks and development of mitochondria-targeted Cu-based drugs.
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Affiliation(s)
- Michael O Isei
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE, C1A 4P3, Canada
| | - Collins Kamunde
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE, C1A 4P3, Canada.
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Munro D, Pamenter ME. Comparative studies of mitochondrial reactive oxygen species in animal longevity: Technical pitfalls and possibilities. Aging Cell 2019; 18:e13009. [PMID: 31322803 PMCID: PMC6718592 DOI: 10.1111/acel.13009] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 06/03/2019] [Accepted: 06/30/2019] [Indexed: 11/30/2022] Open
Abstract
The mitochondrial oxidative theory of aging has been repeatedly investigated over the past 30 years by comparing the efflux of hydrogen peroxide (H2O2) from isolated mitochondria of long‐ and short‐lived species using horseradish peroxidase‐based assays. However, a clear consensus regarding the relationship between H2O2 production rates and longevity has not emerged. Concomitantly, novel insights into the mechanisms of reactive oxygen species (ROS) handling by mitochondria themselves should have raised concerns about the validity of this experimental approach. Here, we review pitfalls of the horseradish peroxidase/amplex red detection system for the measurement of mitochondrial ROS formation rates, with an emphasis on longevity studies. Importantly, antioxidant systems in the mitochondrial matrix are often capable of scavenging H2O2 faster than mitochondria produce it. As a consequence, as much as 84% of the H2O2 produced by mitochondria may be consumed before it diffuses into the reaction medium, where it can be detected by the horseradish peroxidase/amplex red system, this proportion is likely not consistent across species. Furthermore, previous studies often used substrates that elicit H2O2 formation at a much higher rate than in physiological conditions and at sites of secondary importance in vivo. Recent evidence suggests that the activity of matrix antioxidants may correlate with longevity instead of the rate of H2O2 formation. We conclude that past studies have been methodologically insufficient to address the putative relationship between longevity and mitochondrial ROS. Thus, novel methodological approaches are required that more accurately encompass mitochondrial ROS metabolism.
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Affiliation(s)
- Daniel Munro
- Department of Biology University of Ottawa Ottawa Ontario Canada
| | - Matthew E. Pamenter
- Department of Biology University of Ottawa Ottawa Ontario Canada
- University of Ottawa Brain and Mind Research Institute Ottawa Ontario Canada
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14
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Gallorini M, Berardi AC, Gissi C, Cataldi A, Osti L. Nrf2-mediated cytoprotective effect of four different hyaluronic acids by molecular weight in human tenocytes. J Drug Target 2019; 28:212-224. [PMID: 31339382 DOI: 10.1080/1061186x.2019.1648476] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Non-traumatic rotator cuff tears (RCTs) are a frequent and potentially disabling injury. There is growing evidence that hyaluronic acid (HA) is effective for pain relief and to counteract inflammation in RCTs, however, its effective role in tendinopathies remains poorly studied. This study aims to disclose a possible molecular mechanism underlying the cytoprotective effects of four different HA preparations (Artrosulfur HA®, Synolis VA®, Hyalgan® and Hyalubrix®) under H2O2-induced oxidative stress. Expression-levels of Lactate dehydrogenase (LDH) released were quantified in cell supernatants, CD44 expression levels were analysed by fluorescence microscopy, the mitochondrial membrane depolarisation (TMRE assay) was measured by flow cytometry and the role of the transcription factor Nrf2 was investigated as a potential therapeutic target for RCT treatment. The modulation of extracellular matrix- (ECM) related protein expression (Integrin β1, pro-collagen 1A2 and collagen 1A1) and autophagy occurrence (Erk 1/2 and phosphoErk 1/2 and LC3B), were all investigated by Western Blot. Results demonstrate that Artrosulfur HA, Hyalubrix and Hyalgan improve cell escape from H2O2-induced oxidative stress, decreasing cytotoxicity, reducing Nrf2 expression and enhancing catalase recovery. This study lays the grounds for further investigations insight novel pharmaceutical strategies targeting key effectors involved in the molecular cascade triggered by HA.
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Affiliation(s)
- Marialucia Gallorini
- Department of Pharmacy, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy
| | - Anna C Berardi
- UOC of Immunohaematology and Transfusion Medicine, Laboratory of Stem Cells, Spirito Santo Hospital, Pescara, Italy
| | - Clarissa Gissi
- UOC of Immunohaematology and Transfusion Medicine, Laboratory of Stem Cells, Spirito Santo Hospital, Pescara, Italy
| | - Amelia Cataldi
- Department of Pharmacy, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy
| | - Leonardo Osti
- Unit of Arthroscopy and Sports Medicine, Hesperia Hospital, Modena, Italy
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15
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Zhao D, Yu Y, Shen Y, Liu Q, Zhao Z, Sharma R, Reiter RJ. Melatonin Synthesis and Function: Evolutionary History in Animals and Plants. Front Endocrinol (Lausanne) 2019; 10:249. [PMID: 31057485 PMCID: PMC6481276 DOI: 10.3389/fendo.2019.00249] [Citation(s) in RCA: 318] [Impact Index Per Article: 63.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 03/29/2019] [Indexed: 12/12/2022] Open
Abstract
Melatonin is an ancient molecule that can be traced back to the origin of life. Melatonin's initial function was likely that as a free radical scavenger. Melatonin presumably evolved in bacteria; it has been measured in both α-proteobacteria and in photosynthetic cyanobacteria. In early evolution, bacteria were phagocytosed by primitive eukaryotes for their nutrient value. According to the endosymbiotic theory, the ingested bacteria eventually developed a symbiotic association with their host eukaryotes. The ingested α-proteobacteria evolved into mitochondria while cyanobacteria became chloroplasts and both organelles retained their ability to produce melatonin. Since these organelles have persisted to the present day, all species that ever existed or currently exist may have or may continue to synthesize melatonin in their mitochondria (animals and plants) and chloroplasts (plants) where it functions as an antioxidant. Melatonin's other functions, including its multiple receptors, developed later in evolution. In present day animals, via receptor-mediated means, melatonin functions in the regulation of sleep, modulation of circadian rhythms, enhancement of immunity, as a multifunctional oncostatic agent, etc., while retaining its ability to reduce oxidative stress by processes that are, in part, receptor-independent. In plants, melatonin continues to function in reducing oxidative stress as well as in promoting seed germination and growth, improving stress resistance, stimulating the immune system and modulating circadian rhythms; a single melatonin receptor has been identified in land plants where it controls stomatal closure on leaves. The melatonin synthetic pathway varies somewhat between plants and animals. The amino acid, tryptophan, is the necessary precursor of melatonin in all taxa. In animals, tryptophan is initially hydroxylated to 5-hydroxytryptophan which is then decarboxylated with the formation of serotonin. Serotonin is either acetylated to N-acetylserotonin or it is methylated to form 5-methoxytryptamine; these products are either methylated or acetylated, respectively, to produce melatonin. In plants, tryptophan is first decarboxylated to tryptamine which is then hydroxylated to form serotonin.
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Affiliation(s)
- Dake Zhao
- Biocontrol Engineering Research Center of Plant Disease and Pest, Yunnan University, Kunming, China
- Biocontrol Engineering Research Center of Crop Disease and Pest, Yunnan University, Kunming, China
- School of Life Science, Yunnan University, Kunming, China
| | - Yang Yu
- State Key Laboratory for Conservation and Utilization of Bio-resources in Yunnan, Yunnan University, Kunming, China
| | - Yong Shen
- College of Agriculture and Biotechnology, Yunnan Agricultural University, Kunming, China
| | - Qin Liu
- School of Landscape and Horticulture, Yunnan Vocational and Technical College of Agriculture, Kunming, China
| | - Zhiwei Zhao
- State Key Laboratory for Conservation and Utilization of Bio-resources in Yunnan, Yunnan University, Kunming, China
| | - Ramaswamy Sharma
- Department of Cell Systems and Anatomy, The University of Texas Health Science Center at San Antonio (UT Health), San Antonio, TX, United States
| | - Russel J. Reiter
- Department of Cell Systems and Anatomy, The University of Texas Health Science Center at San Antonio (UT Health), San Antonio, TX, United States
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Roussel D, Boël M, Mortz M, Romestaing C, Duchamp C, Voituron Y. Threshold effect in the H2O2 production of skeletal muscle mitochondria during fasting and refeeding. J Exp Biol 2019; 222:jeb.196188. [DOI: 10.1242/jeb.196188] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 01/22/2019] [Indexed: 01/14/2023]
Abstract
Under nutritional deprivation, the energetic benefits of reducing mitochondrial metabolism are often associated with enhanced harmful pro-oxidant effects and a subsequent long-term negative impact on cellular integrity. However, the flexibility of mitochondrial functioning under stress has rarely been explored during the transition from basal non-phosphorylating to maximal phosphorylating oxygen consumption. Here, we experimentally tested whether ducklings (Cairina moschata) fasted for 6 days and thereafter refed for 3 days, exhibited modifications to their mitochondrial fluxes, i.e. oxygen consumption, ATP synthesis, reactive oxygen species generation (ROS) and associated ratios, such as the electron leak (% ROS/O) and the oxidative cost of ATP production (% ROS/ATP). This was done at different steady state rate of oxidative phosphorylation in both pectoralis (glycolytic) and gastrocnemius (oxidative) muscles. Fasting induced a decrease in the rates of oxidative phosphorylation and maximal ROS release. All these changes were completely reversed by 3 days of refeeding. Yet, the fundamental finding of the present study is the existence of a clear threshold in ROS release and associated ratios, which remained low until a low level of mitochondrial activity is reached (30-40% of maximal oxidative phosphorylation activity).
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Affiliation(s)
- Damien Roussel
- Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, UMR 5023 CNRS, Université de Lyon, ENTPE, Lyon, France
| | - Mélanie Boël
- Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, UMR 5023 CNRS, Université de Lyon, ENTPE, Lyon, France
| | - Mathieu Mortz
- Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, UMR 5023 CNRS, Université de Lyon, ENTPE, Lyon, France
| | - Caroline Romestaing
- Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, UMR 5023 CNRS, Université de Lyon, ENTPE, Lyon, France
| | - Claude Duchamp
- Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, UMR 5023 CNRS, Université de Lyon, ENTPE, Lyon, France
| | - Yann Voituron
- Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, UMR 5023 CNRS, Université de Lyon, ENTPE, Lyon, France
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Treberg JR, Braun K, Selseleh P. Mitochondria can act as energy-sensing regulators of hydrogen peroxide availability. Redox Biol 2018; 20:483-488. [PMID: 30466061 PMCID: PMC6249968 DOI: 10.1016/j.redox.2018.11.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 10/26/2018] [Accepted: 11/06/2018] [Indexed: 01/04/2023] Open
Abstract
Mitochondria are widely recognized as sources of reactive oxygen species in animal cells, with H2O2 being of particular note because it can act not only in oxidative stress but also is important to several signalling pathways. Lesser recognized is that mitochondria can have far greater capacity to consume H2O2 than to produce it; however, the consumption of H2O2 may be kinetically constrained by H2O2 availability especially at the low nanomolar (or lower) concentrations that occur in vivo. The production of H2O2 is a function of many factors, not the least of which are respiratory substrate availability and the protonmotive force (Δp). The Δp, which is predominantly membrane potential (ΔΨ), can be a strong indicator of mitochondrial energy status, particularly if respiratory substrate supply is either not meeting or exceeding demand. The notion that mitochondria may functionally act in regulating H2O2 concentrations may be somewhat implicit but little evidence demonstrating this is available. Here we demonstrate key assumptions that are required for mitochondria to act as regulators of H2O2 by an integrated system of production and concomitant consumption. In particular we show the steady-state level of H2O2 mitochondria approach is a function of both mitochondrial H2O2 consumption and production capacity, the latter of which is strongly influenced by ΔΨ. Our results are consistent with mitochondria being able to manipulate extramitochondrial H2O2 as a means of signalling mitochondrial energetic status, in particular the Δp or ΔΨ. Such a redox-based signal could operate with some independence from other energy sensing mechanisms such as those that transmit information using the cytosolic adenylate pool.
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Affiliation(s)
- Jason R Treberg
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, Canada; Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, Canada; Centre on Aging, University of Manitoba, Winnipeg, MB, Canada.
| | - Kristen Braun
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Parisa Selseleh
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, Canada
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18
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Treberg JR, Munro D, Jastroch M, Quijada-Rodriguez AR, Kutschke M, Wiens L. Comparing Electron Leak in Vertebrate Muscle Mitochondria. Integr Comp Biol 2018; 58:495-505. [DOI: 10.1093/icb/icy095] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Jason R Treberg
- Department of Biological Sciences, University of Manitoba, 50 Sifton Road, Winnipeg, Manitoba, Canada R3T2N2
- Department of Food and Human Nutritional Sciences, University of Manitoba, 50 Sifton Road, Winnipeg, Manitoba, Canada R3T2N2
- Centre on Aging, University of Manitoba, 50 Sifton Road, Winnipeg, Manitoba, Canada R3T2N2
| | - Daniel Munro
- Department of Biological Sciences, University of Manitoba, 50 Sifton Road, Winnipeg, Manitoba, Canada R3T2N2
- Department of Biology, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
| | - Martin Jastroch
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Laboratories F3, Stockholm University, Stockholm SE-106 91, Sweden
| | - Alex R Quijada-Rodriguez
- Department of Biological Sciences, University of Manitoba, 50 Sifton Road, Winnipeg, Manitoba, Canada R3T2N2
| | - Maria Kutschke
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center at Helmholtz Zentrum München, Neuherberg D-85764, Germany
| | - Lilian Wiens
- Department of Biological Sciences, University of Manitoba, 50 Sifton Road, Winnipeg, Manitoba, Canada R3T2N2
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50 years of comparative biochemistry: The legacy of Peter Hochachka. Comp Biochem Physiol B Biochem Mol Biol 2018; 224:1-11. [PMID: 29501788 DOI: 10.1016/j.cbpb.2018.02.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 02/05/2018] [Accepted: 02/07/2018] [Indexed: 12/29/2022]
Abstract
Peter Hochachka was an early pioneer in the field of comparative biochemistry. He passed away in 2002 after 4 decades of research in the discipline. To celebrate his contributions and to coincide with what would have been his 80th birthday, a group of his former students organized a symposium that ran as a satellite to the 2017 Canadian Society of Zoologists annual meeting in Winnipeg, Manitoba (Canada). This Special Issue of CBP brings together manuscripts from symposium attendees and other authors who recognize the role Peter played in the evolution of the discipline. In this article, the symposium organizers and guest editors look back on his career, celebrating his many contributions to research, acknowledging his role in training of generations of graduate students and post-doctoral fellows in comparative biochemistry and physiology.
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