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Nakata K, Hatakeyama Y, Erra-Balsells R, Nonami H, Wada H. Dynamics and stabilization mechanism of mitochondrial cristae morphofunction associated with turgor-driven cardiolipin biosynthesis under salt stress conditions. Sci Rep 2022; 12:9727. [PMID: 35778427 PMCID: PMC9249792 DOI: 10.1038/s41598-022-14164-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 06/02/2022] [Indexed: 12/03/2022] Open
Abstract
Maintaining energy production efficiency is of vital importance to plants growing under changing environments. Cardiolipin localized in the inner mitochondrial membrane plays various important roles in mitochondrial function and its activity, although the regulation of mitochondrial morphology to various stress conditions remains obscure, particularly in the context of changes in cellular water relations and metabolisms. By combining single-cell metabolomics with transmission electron microscopy, we have investigated the adaptation mechanism in tomato trichome stalk cells at moderate salt stress to determine the kinetics of cellular parameters and metabolisms. We have found that turgor loss occurred just after the stress conditions, followed by the contrasting volumetric changes in mitochondria and cells, the accumulation of TCA cycle-related metabolites at osmotic adjustment, and a temporal increase in cardiolipin concentration, resulting in a reversible topological modification in the tubulo-vesicular cristae. Because all of these cellular events were dynamically observed in the same single-cells without causing any disturbance for redox states and cytoplasmic streaming, we conclude that turgor pressure might play a regulatory role in the mitochondrial morphological switch throughout the temporal activation of cardiolipin biosynthesis, which sustains mitochondrial respiration and energy conversion even under the salt stress conditions.
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Affiliation(s)
- Keisuke Nakata
- The United Graduate School of Agricultural Science, Ehime University, Matsuyama, Ehime, Japan
| | - Yuto Hatakeyama
- Graduate School of Agriculture, Ehime University, Matsuyama, Ehime, Japan
| | - Rosa Erra-Balsells
- Department of Organic Chemistry and CIHIDECAR-CONICET, University of Buenos Aires, Buenos Aires, Argentina
| | - Hiroshi Nonami
- Graduate School of Agriculture, Ehime University, Matsuyama, Ehime, Japan
| | - Hiroshi Wada
- The United Graduate School of Agricultural Science, Ehime University, Matsuyama, Ehime, Japan.
- Graduate School of Agriculture, Ehime University, Matsuyama, Ehime, Japan.
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2
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Baev AY, Charishnikova OS, Khasanov FA, Nebesnaya KS, Makhmudov AR, Rakhmedova MT, Khushbaktova ZA, Syrov VN, Levitskaya YV. Ecdysterone prevents negative effect of acute immobilization stress on energy metabolism of rat liver mitochondria. J Steroid Biochem Mol Biol 2022; 219:106066. [PMID: 35104603 DOI: 10.1016/j.jsbmb.2022.106066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 01/06/2022] [Accepted: 01/28/2022] [Indexed: 11/16/2022]
Abstract
Ecdysterone is a naturally occurring steroid hormone, which presents in arthropods and in a number of plants as an insect defence tool. There are many studies showing that application of ecdysterone can alter mitochondrial functions of mammalian cells, however it is not clear whether its effects are direct or mediated by activation of other cellular processes. In our study, we have shown how ecdysterone acts at the mitochondrial level in normal conditions and in certain pathology. We have demonstrated that application of immobilization stress to male rats causes uncoupling of mitochondrial oxidative phosphorylation, the preliminary application of ecdysterone prevents negative effect of immobilization stress on mitochondria. In-vitro experiments with isolated mitochondria have shown that ecdysterone can increase mitochondrial coupling and hyperpolarise mitochondria but without a noticeable effect on ADP/O ratio. Molecular docking experiments revealed that ecdysterone has high binding energy with mitochondrial FOF1 ATP synthase, but further biochemical analysis have not revealed either stimulatory or inhibitory effect of ecdysterone on FOF1 ATPase activity of the enzyme. Thus, ecdysterone can directly affect mitochondrial bioenergetics, though we assume that its preventive effect on mitochondria during immobilization stress is also coupled with the activation of some other cellular processes.
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Affiliation(s)
- Artyom Y Baev
- Laboratory of Experimental Biophysics, Centre for Advanced Technologies, Tashkent, Uzbekistan; Department of Biophysics, Faculty of Biology, National University of Uzbekistan, Tashkent, Uzbekistan.
| | - Oksana S Charishnikova
- Laboratory of Experimental Biophysics, Centre for Advanced Technologies, Tashkent, Uzbekistan
| | - Feruzbek A Khasanov
- Laboratory of Experimental Biophysics, Centre for Advanced Technologies, Tashkent, Uzbekistan; Department of Biochemistry, Faculty of Biology, National University of Uzbekistan, Tashkent, Uzbekistan
| | - Kamila S Nebesnaya
- Laboratory of Experimental Biophysics, Centre for Advanced Technologies, Tashkent, Uzbekistan; Department of Biophysics, Faculty of Biology, National University of Uzbekistan, Tashkent, Uzbekistan
| | - Albert R Makhmudov
- Laboratory of Experimental Biophysics, Centre for Advanced Technologies, Tashkent, Uzbekistan; Faculty of Chemistry, National University of Uzbekistan, Tashkent, Uzbekistan
| | - Mannona T Rakhmedova
- Laboratory of Experimental Biophysics, Centre for Advanced Technologies, Tashkent, Uzbekistan
| | - Zainab A Khushbaktova
- S. Yu. Yunusov Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan
| | - Vladimir N Syrov
- S. Yu. Yunusov Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan
| | - Yuliya V Levitskaya
- Laboratory of Experimental Biophysics, Centre for Advanced Technologies, Tashkent, Uzbekistan; Department of Biophysics, Faculty of Biology, National University of Uzbekistan, Tashkent, Uzbekistan.
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3
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Yoneda M, Aklima J, Ohsawa I, Ohta Y. Effects of proton pumping on the structural rigidity of cristae in mitochondria. Arch Biochem Biophys 2022; 720:109172. [PMID: 35276212 DOI: 10.1016/j.abb.2022.109172] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 03/06/2022] [Accepted: 03/07/2022] [Indexed: 02/08/2023]
Abstract
Mitochondria change their morphology and inner membrane structure depending on their activity. Since mitochondrial activity also depends on their structure, it is important to elucidate the interrelationship between the activity and structure of mitochondria. However, the mechanism by which mitochondrial activity affects the structure of cristae, the folded structure of the inner membrane, is not well understood. In this study, the effect of the mitochondrial activity on the cristae structure was investigated by examining the structural rigidity of cristae. Taking advantage of the fact that unfolding of cristae induces mitochondrial swelling, we investigated the relationship between mitochondrial activity and the susceptibility to swelling. The swelling of individual isolated mitochondria exposed to a hypotonic solution was observed with an optical microscope. The presence of respiratory substrates (malate and glutamate) increased the percentage of mitochondria that underwent swelling, and the further addition of rotenone or KCN (inhibitors of proton pumps) reversed the increase. In the absence of respiratory substrates, acidification of the buffer surrounding the mitochondria also increased the percentage of swollen mitochondria. These observations suggest that acidification of the outer surface of inner membranes, especially intracristal space, by proton translocation from the matrix to the intracristal space, decreases the structural rigidity of the cristae. This interpretation was verified by the observation that ADP or CCCP, which induces proton re-entry to the matrix, suppressed the mitochondrial swelling in the presence of respiratory substrates. The addition of CCCP to the cells induced a morphological change in mitochondria from an initial elongated structure to a largely curved structure at pH 7.4, but there were no morphological changes when the pH of the cytosol dropped to 6.2. These results suggest that a low pH in the intracristal space may be helpful in maintaining the elongated structure of mitochondria. The present study shows that proton pumping by the electron transfer chain is the mechanism underlying mitochondrial morphology and the flexibility of cristae structure.
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Affiliation(s)
- Mayu Yoneda
- Division of Biotechnology and Life Sciences, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan
| | - Jannatul Aklima
- Division of Biotechnology and Life Sciences, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan; Department of Biochemistry & Molecular Biology, University of Chittagong, Chittagong, 4331, Bangladesh
| | - Ikuroh Ohsawa
- Biological Process of Aging, Tokyo Metropolitan Institute of Gerontology, Itabashi, Tokyo, 173-0015, Japan
| | - Yoshihiro Ohta
- Division of Biotechnology and Life Sciences, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan.
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4
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Kruglov AG, Kharechkina ES, Nikiforova AB, Odinokova IV, Kruglova SA. Dynamics of the permeability transition pore size in isolated mitochondria and mitoplasts. FASEB J 2021; 35:e21764. [PMID: 34245631 DOI: 10.1096/fj.202100596r] [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] [Received: 04/07/2021] [Revised: 05/28/2021] [Accepted: 06/14/2021] [Indexed: 11/11/2022]
Abstract
The size of the permeability transition pore (PTP) is accepted to be ≤1.5 kDa. However, different authors reported values from 650 to 4000 Da. The present study is focused on the variability of the average PTP size in and between mitochondrial samples, its reasons and relations with PTP dynamics. Measurement of PTP size by the standard method revealed its 500 Da-range variability between mitochondrial samples. Sequential measurements in the same sample showed that the PTP size tends to grow with time and Ca2+ concentration. Selective damage to the mitochondrial outer membrane (MOM) reduced the apparent PTP size by ~200-300 Da. Hypotonic and hypertonic osmotic shock and partial removal of the MOM with the preservation of the mitochondrial inner membrane intactness decreased the apparent PTP size by ~50%. We developed an approach to continuous monitoring of the PTP size that revealed the existence of stable PTP states with different pore sizes (~700, 900-1000, ~1350, 1700-1800, and 2100-2200 Da) and transitions between them. The transitions were accelerated by elevating the Ca2+ concentration, temperature, and osmotic pressure, which demonstrates an increased capability of PTP to accommodate to large molecules (plasticity). Cyclosporin A inhibited the transitions between states. The analysis of PTP size dynamics in osmotically shocked mitochondria and mitoplasts confirmed the importance of the MOM for the stabilization of PTP structure. Thus, this approach provides a new tool for PTP studies and the opportunity to reconcile data on the PTP size and mitochondrial megachannel conductance.
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Affiliation(s)
- Alexey G Kruglov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russia
| | - Ekaterina S Kharechkina
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russia
| | - Anna B Nikiforova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russia
| | - Irina V Odinokova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russia
| | - Svetlana A Kruglova
- Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Russia
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5
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Galber C, Minervini G, Cannino G, Boldrin F, Petronilli V, Tosatto S, Lippe G, Giorgio V. The f subunit of human ATP synthase is essential for normal mitochondrial morphology and permeability transition. Cell Rep 2021; 35:109111. [PMID: 33979610 DOI: 10.1016/j.celrep.2021.109111] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 03/11/2021] [Accepted: 04/20/2021] [Indexed: 01/03/2023] Open
Abstract
The f subunit is localized at the base of the ATP synthase peripheral stalk. Its function in the human enzyme is poorly characterized. Because full disruption of its ATP5J2 gene with the CRISPR-Cas9 strategy in the HAP1 human model has been shown to cause alterations in the amounts of other ATP synthase subunits, here we investigated the role of the f subunit in HeLa cells by regulating its levels through RNA interference. We confirm the role of the f subunit in ATP synthase dimer stability and observe that its downregulation per se does not alter the amounts of the other enzyme subunits or ATP synthase synthetic/hydrolytic activity. We show that downregulation of the f subunit causes abnormal crista organization and decreases permeability transition pore (PTP) size, whereas its re-expression in f subunit knockdown cells rescues mitochondrial morphology and PTP-dependent swelling.
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Affiliation(s)
- Chiara Galber
- Department of Biomedical Sciences, University of Padova, Padova 35121, Italy; Consiglio Nazionale delle Ricerche Institute of Neuroscience, Padova 35121, Italy
| | - Giovanni Minervini
- Department of Biomedical Sciences, University of Padova, Padova 35121, Italy
| | - Giuseppe Cannino
- Department of Biomedical Sciences, University of Padova, Padova 35121, Italy
| | | | - Valeria Petronilli
- Department of Biomedical Sciences, University of Padova, Padova 35121, Italy; Consiglio Nazionale delle Ricerche Institute of Neuroscience, Padova 35121, Italy
| | - Silvio Tosatto
- Department of Biomedical Sciences, University of Padova, Padova 35121, Italy
| | - Giovanna Lippe
- Department of Medicine, University of Udine, Udine 33100, Italy
| | - Valentina Giorgio
- Department of Biomedical Sciences, University of Padova, Padova 35121, Italy; Consiglio Nazionale delle Ricerche Institute of Neuroscience, Padova 35121, Italy; Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna 40126, Italy.
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6
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Neginskaya MA, Pavlov EV, Sheu SS. Electrophysiological properties of the mitochondrial permeability transition pores: Channel diversity and disease implication. BIOCHIMICA ET BIOPHYSICA ACTA. BIOENERGETICS 2021; 1862:148357. [PMID: 33359307 PMCID: PMC7954400 DOI: 10.1016/j.bbabio.2020.148357] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 11/26/2020] [Accepted: 12/15/2020] [Indexed: 02/07/2023]
Abstract
The mitochondrial permeability transition pore (mPTP) is a channel that, when open, is responsible for a dramatic increase in the permeability of the mitochondrial inner membrane, a process known as the mitochondrial permeability transition (mPT). mPTP activation during Ca2+ dyshomeostasis and oxidative stress disrupts normal mitochondrial function and induces cell death. mPTP opening has been implicated as a critical event in many diseases, including hypoxic injuries, neurodegeneration, and diabetes. Discoveries of recent years indicate that mPTP demonstrates very complicated behavior and regulation, and depending on specific induction or stress conditions, it can function as a high-conductance pore, a small channel, or a non-specific membrane leak. The focus of this review is to summarize the literature on the electrophysiological properties of the mPTP and to evaluate the evidence that it has multiple molecular identities. This review also provides perspective on how an electrophysiological approach can be used to quantitatively investigate the biophysical properties of the mPTP under physiological, pharmacological, pathophysiological, and disease conditions.
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Affiliation(s)
- M A Neginskaya
- Department of Molecular Pathobiology, New York University, New York, NY, USA.
| | - E V Pavlov
- Department of Molecular Pathobiology, New York University, New York, NY, USA
| | - S-S Sheu
- Department of Medicine, Center for Translational Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA.
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7
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Cui Y, Pan M, Ma J, Song X, Cao W, Zhang P. Recent progress in the use of mitochondrial membrane permeability transition pore in mitochondrial dysfunction-related disease therapies. Mol Cell Biochem 2021; 476:493-506. [PMID: 33000352 DOI: 10.1007/s11010-020-03926-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 09/23/2020] [Indexed: 12/13/2022]
Abstract
Mitochondria have various cellular functions, including ATP synthesis, calcium homeostasis, cell senescence, and death. Mitochondrial dysfunction has been identified in a variety of disorders correlated with human health. Among the many underlying mechanisms of mitochondrial dysfunction, the opening up of the mitochondrial permeability transition pore (mPTP) is one that has drawn increasing interest in recent years. It plays an important role in apoptosis and necrosis; however, the molecular structure and function of the mPTP have still not been fully elucidated. In recent years, the abnormal opening up of the mPTP has been implicated in the development and pathogenesis of diverse diseases including ischemia/reperfusion injury (IRI), neurodegenerative disorders, tumors, and chronic obstructive pulmonary disease (COPD). This review provides a systematic introduction to the possible molecular makeup of the mPTP and summarizes the mitochondrial dysfunction-correlated diseases and highlights possible underlying mechanisms. Since the mPTP is an important target in mitochondrial dysfunction, this review also summarizes potential treatments, which may be used to inhibit pore opening up via the molecules composing mPTP complexes, thus suppressing the progression of mitochondrial dysfunction-related diseases.
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Affiliation(s)
- Yuting Cui
- School of Life Science, Shandong University of Technology, Zibo, Shandong Province, China
| | - Mingyue Pan
- Department of Pharmacy, Shenzhen Luohu People's Hospital, Shenzhen, Guangdong Province, China
| | - Jing Ma
- The Eighth Affiliated Hospital, Sun Yat-Sen University, Shenzhen, Guangdong Province, China
| | - Xinhua Song
- School of Life Science, Shandong University of Technology, Zibo, Shandong Province, China
| | - Weiling Cao
- Department of Pharmacy, Shenzhen Luohu People's Hospital, Shenzhen, Guangdong Province, China.
| | - Peng Zhang
- Department of Pharmacy, Shenzhen Luohu People's Hospital, Shenzhen, Guangdong Province, China.
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8
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Neginskaya MA, Strubbe JO, Amodeo GF, West BA, Yakar S, Bazil JN, Pavlov EV. The very low number of calcium-induced permeability transition pores in the single mitochondrion. J Gen Physiol 2020; 152:e202012631. [PMID: 32810269 PMCID: PMC7537349 DOI: 10.1085/jgp.202012631] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 06/22/2020] [Accepted: 07/24/2020] [Indexed: 12/12/2022] Open
Abstract
Mitochondrial permeability transition (PT) is a phenomenon of stress-induced increase in nonspecific permeability of the mitochondrial inner membrane that leads to disruption of oxidative phosphorylation and cell death. Quantitative measurement of the membrane permeability increase during PT is critically important for understanding the PT's impact on mitochondrial function. The elementary unit of PT is a PT pore (PTP), a single channel presumably formed by either ATP synthase or adenine nucleotide translocator (ANT). It is not known how many channels are open in a single mitochondrion during PT, which makes it difficult to quantitatively estimate the overall degree of membrane permeability. Here, we used wide-field microscopy to record mitochondrial swelling and quantitatively measure rates of single-mitochondrion volume increase during PT-induced high-amplitude swelling. PT was quantified by calculating the rates of water flux responsible for measured volume changes. The total water flux through the mitochondrial membrane of a single mitochondrion during PT was in the range of (2.5 ± 0.4) × 10-17 kg/s for swelling in 2 mM Ca2+ and (1.1 ± 0.2) × 10-17 kg/s for swelling in 200 µM Ca2+. Under these experimental conditions, a single PTP channel with ionic conductance of 1.5 nS could allow passage of water at the rate of 0.65 × 10-17 kg/s. Thus, we estimate the integral ionic conductance of the whole mitochondrion during PT to be 5.9 ± 0.9 nS for 2 mM concentration of Ca2+ and 2.6 ± 0.4 nS for 200 µM of Ca2+. The number of PTPs per mitochondrion ranged from one to nine. Due to the uncertainties in PTP structure and model parameters, PTP count results may be slightly underestimated. However, taking into account that each mitochondrion has ∼15,000 copies of ATP synthases and ANTs, our data imply that PTP activation is a rare event that occurs only in a small subpopulation of these proteins.
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Affiliation(s)
- Maria A. Neginskaya
- Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY
| | - Jasiel O. Strubbe
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, MI
- Department of Physiology, Michigan State University, East Lansing, MI
| | - Giuseppe F. Amodeo
- Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY
| | - Benjamin A. West
- Department of Physiology, Michigan State University, East Lansing, MI
| | - Shoshana Yakar
- Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY
| | - Jason N. Bazil
- Department of Physiology, Michigan State University, East Lansing, MI
| | - Evgeny V. Pavlov
- Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY
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9
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Hexokinase II dissociation alone cannot account for changes in heart mitochondrial function, morphology and sensitivity to permeability transition pore opening following ischemia. PLoS One 2020; 15:e0234653. [PMID: 32579577 PMCID: PMC7313731 DOI: 10.1371/journal.pone.0234653] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 05/31/2020] [Indexed: 12/22/2022] Open
Abstract
We previously demonstrated that hexokinase II (HK2) dissociation from mitochondria during cardiac ischemia correlates with cytochrome c (cyt-c) loss, oxidative stress and subsequent reperfusion injury. However, whether HK2 release is the primary signal mediating this ischemia-induced mitochondrial dysfunction was not established. To investigate this, we studied the effects of dissociating HK2 from isolated heart mitochondria. Mitochondria isolated from Langendorff-perfused rat hearts before and after 30 min global ischemia ± ischemic preconditioning (IPC) were subject to in vitro dissociation of HK2 by incubation with glucose-6-phosphate at pH 6.3. Prior HK2 dissociation from pre- or end-ischemic heart mitochondria had no effect on their cyt-c release, respiration (± ADP) or mitochondrial permeability transition pore (mPTP) opening. Inner mitochondrial membrane morphology was assessed indirectly by monitoring changes in light scattering (LS) and confirmed by transmission electron microscopy. Although no major ultrastructure differences were detected between pre- and end-ischemia mitochondria, the amplitude of changes in LS was reduced in the latter. This was prevented by IPC but not mimicked in vitro by HK2 dissociation. We also observed more Drp1, a mitochondrial fission protein, in end-ischemia mitochondria. IPC failed to prevent this increase but did decrease mitochondrial-associated dynamin 2. In vitro HK2 dissociation alone cannot replicate ischemia-induced effects on mitochondrial function implying that in vivo dissociation of HK2 modulates end-ischemia mitochondrial function indirectly perhaps involving interaction with mitochondrial fission proteins. The resulting changes in mitochondrial morphology and cristae structure would destabilize outer / inner membrane interactions, increase cyt-c release and enhance mPTP sensitivity to [Ca2+].
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10
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Algieri C, Trombetti F, Pagliarani A, Ventrella V, Bernardini C, Fabbri M, Forni M, Nesci S. Mitochondrial Ca 2+ -activated F 1 F O -ATPase hydrolyzes ATP and promotes the permeability transition pore. Ann N Y Acad Sci 2019; 1457:142-157. [PMID: 31441951 DOI: 10.1111/nyas.14218] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 07/19/2019] [Accepted: 07/24/2019] [Indexed: 01/14/2023]
Abstract
The properties of the mitochondrial F1 FO -ATPase catalytic site, which can bind Mg2+ , Mn2+ , or Ca2+ and hydrolyze ATP, were explored by inhibition kinetic analyses to cast light on the Ca2+ -activated F1 FO -ATPase connection with the permeability transition pore (PTP) that initiates cascade events leading to cell death. While the natural cofactor Mg2+ activates the F1 FO -ATPase in competition with Mn2+ , Ca2+ is a noncompetitive inhibitor in the presence of Mg2+ . Selective F1 inhibitors (Is-F1 ), namely NBD-Cl, piceatannol, resveratrol, and quercetin, exerted different mechanisms (mixed and uncompetitive inhibition) on either Ca2+ - or Mg2+ -activated F1 FO -ATPase, consistent with the conclusion that the catalytic mechanism changes when Mg2+ is replaced by Ca2+ . In a partially purified F1 domain preparation, Ca2+ -activated F1 -ATPase maintained Is-F1 sensitivity, and enzyme inhibition was accompanied by the maintenance of the mitochondrial calcium retention capacity and membrane potential. The data strengthen the structural relationship between Ca2+ -activated F1 FO -ATPase and the PTP, and, in turn, on consequences, such as physiopathological cellular changes.
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Affiliation(s)
- Cristina Algieri
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
| | - Fabiana Trombetti
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
| | | | - Vittoria Ventrella
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
| | - Chiara Bernardini
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
| | - Micaela Fabbri
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
| | - Monica Forni
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
| | - Salvatore Nesci
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
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11
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Abstract
Significance: In addition to their classical role in cellular ATP production, mitochondria are of key relevance in various (patho)physiological mechanisms including second messenger signaling, neuro-transduction, immune responses and death induction. Recent Advances: Within cells, mitochondria are motile and display temporal changes in internal and external structure ("mitochondrial dynamics"). During the last decade, substantial empirical and in silico evidence was presented demonstrating that mitochondrial dynamics impacts on mitochondrial function and vice versa. Critical Issues: However, a comprehensive and quantitative understanding of the bidirectional links between mitochondrial external shape, internal structure and function ("morphofunction") is still lacking. The latter particularly hampers our understanding of the functional properties and behavior of individual mitochondrial within single living cells. Future Directions: In this review we discuss the concept of mitochondrial morphofunction in mammalian cells, primarily using experimental evidence obtained within the last decade. The topic is introduced by briefly presenting the central role of mitochondria in cell physiology and the importance of the mitochondrial electron transport chain (ETC) therein. Next, we summarize in detail how mitochondrial (ultra)structure is controlled and discuss empirical evidence regarding the equivalence of mitochondrial (ultra)structure and function. Finally, we provide a brief summary of how mitochondrial morphofunction can be quantified at the level of single cells and mitochondria, how mitochondrial ultrastructure/volume impacts on mitochondrial bioreactions and intramitochondrial protein diffusion, and how mitochondrial morphofunction can be targeted by small molecules.
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Affiliation(s)
- Elianne P. Bulthuis
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Merel J.W. Adjobo-Hermans
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Peter H.G.M. Willems
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Werner J.H. Koopman
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
- Address correspondence to: Dr. Werner J.H. Koopman, Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, P.O. Box 9101, Nijmegen NL-6500 HB, The Netherlands
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12
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Shibata T, Yoneda M, Morikawa D, Ohta Y. Time-lapse imaging of Ca 2+-induced swelling and permeability transition: Single mitochondrion study. Arch Biochem Biophys 2019; 663:288-296. [PMID: 30659803 DOI: 10.1016/j.abb.2019.01.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 12/26/2018] [Accepted: 01/14/2019] [Indexed: 11/26/2022]
Abstract
Mitochondrial functions are closely related to the membrane structure. Mitochondrial swelling, which is accompanied with dissipation of the crista structure and rupture of the outer membrane, have been observed as mitochondrial damage when mitochondria are under Ca2+-overload or oxidative stress. Although these phenomena have been well studied, the detailed behaviors of individual mitochondria upon swelling remain unknown. The aim of this study was to investigate the detailed behavior of mitochondrial volume upon addition of Ca2+. Here, we report for the first time, time-lapse measurements of single mitochondrion swelling and permeability transition induced by Ca2+ by optical microscopy. We added 220 μM Ca2+ to mitochondria, and found that 1) the swelling rate depended on the mitochondrion, 2) a small number of mitochondria showed step-like swelling, 3) cyclosporin A decreased the percentage of mitochondria that underwent swelling induced by Ca2+, but did not affect the amplitude of swelling, 4) permeability transition is necessary but not sufficient for Ca2+-induced swelling, 5) permeability transition is more sensitive to Ca2+ than swelling, 6) Ca2+ stimulated mitochondrial swelling after permeability transition. These results suggest that single mitochondrion measurement of swelling is a powerful tool for examining the regulation of mitochondrial structure.
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Affiliation(s)
- Takahiro Shibata
- Division of Biotechnology and Life Sciences, Institute of Engineering, Tokyo University of Agriculture and Technology, Nakacho 2-24-16, Koganei, Tokyo, 184-8588, Japan
| | - Mayu Yoneda
- Division of Biotechnology and Life Sciences, Institute of Engineering, Tokyo University of Agriculture and Technology, Nakacho 2-24-16, Koganei, Tokyo, 184-8588, Japan
| | - Daisuke Morikawa
- Division of Biotechnology and Life Sciences, Institute of Engineering, Tokyo University of Agriculture and Technology, Nakacho 2-24-16, Koganei, Tokyo, 184-8588, Japan
| | - Yoshihiro Ohta
- Division of Biotechnology and Life Sciences, Institute of Engineering, Tokyo University of Agriculture and Technology, Nakacho 2-24-16, Koganei, Tokyo, 184-8588, Japan.
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13
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Kalani K, Yan SF, Yan SS. Mitochondrial permeability transition pore: a potential drug target for neurodegeneration. Drug Discov Today 2018; 23:1983-1989. [PMID: 30081095 PMCID: PMC6449145 DOI: 10.1016/j.drudis.2018.08.001] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 07/17/2018] [Accepted: 08/01/2018] [Indexed: 12/21/2022]
Abstract
The mitochondrial permeability transition pore (mPTP) has been considered a key contributor to cell death, inducing the process in several major neurodegenerative diseases. To date, the molecular nature of the mPTP remains confounding but its significance is universally acknowledged. Several targets have been screened and inhibition of mPTP has emerged as an attractive field for researchers. Nowadays, in silico-directed studies help to explore new small molecules targeting the mPTP to improve their drug-like properties and bioactivity. Here, we briefly summarize the role of mPTP in neurodegenerative diseases, including Alzheimer's disease (AD), Parkinson disease (PD), and Huntington's disease (HD), and discusses current and future potential therapeutic targets.
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Affiliation(s)
- Komal Kalani
- Department of Pharmacology and Toxicology, Higuchi Bioscience Center, School of Pharmacy, University of Kansas, Lawrence, KS 66047, USA
| | - Shi Fang Yan
- Department of Pharmacology and Toxicology, Higuchi Bioscience Center, School of Pharmacy, University of Kansas, Lawrence, KS 66047, USA
| | - Shirley ShiDu Yan
- Department of Pharmacology and Toxicology, Higuchi Bioscience Center, School of Pharmacy, University of Kansas, Lawrence, KS 66047, USA.
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14
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α-synuclein oligomers interact with ATP synthase and open the permeability transition pore in Parkinson's disease. Nat Commun 2018; 9:2293. [PMID: 29895861 PMCID: PMC5997668 DOI: 10.1038/s41467-018-04422-2] [Citation(s) in RCA: 299] [Impact Index Per Article: 49.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 04/20/2018] [Indexed: 12/18/2022] Open
Abstract
Protein aggregation causes α-synuclein to switch from its physiological role to a pathological toxic gain of function. Under physiological conditions, monomeric α-synuclein improves ATP synthase efficiency. Here, we report that aggregation of monomers generates beta sheet-rich oligomers that localise to the mitochondria in close proximity to several mitochondrial proteins including ATP synthase. Oligomeric α-synuclein impairs complex I-dependent respiration. Oligomers induce selective oxidation of the ATP synthase beta subunit and mitochondrial lipid peroxidation. These oxidation events increase the probability of permeability transition pore (PTP) opening, triggering mitochondrial swelling, and ultimately cell death. Notably, inhibition of oligomer-induced oxidation prevents the pathological induction of PTP. Inducible pluripotent stem cells (iPSC)-derived neurons bearing SNCA triplication, generate α-synuclein aggregates that interact with the ATP synthase and induce PTP opening, leading to neuronal death. This study shows how the transition of α-synuclein from its monomeric to oligomeric structure alters its functional consequences in Parkinson's disease.
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15
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Models, methods, and approaches to study mitochondrial functioning in vitro, in situ, and in vivo: Editorial for the special issue on Mitochondrial Biochemistry and Bioenergetics. Anal Biochem 2018; 552:1-3. [PMID: 29678762 DOI: 10.1016/j.ab.2018.04.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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