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Yamada A, Watanabe A, Nara A, Ishimaru N, Maeda K, Ido Y, Kotake K, Asano M, Shinohara Y, Yamamoto T. Longitudinal Analysis of Mitochondrial Function in a Choline-Deficient L-Amino Acid-Defined High-Fat Diet-Induced Metabolic Dysfunction-Associated Steatohepatitis Mouse Model. Int J Mol Sci 2024; 25:6193. [PMID: 38892381 PMCID: PMC11173319 DOI: 10.3390/ijms25116193] [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: 03/14/2024] [Revised: 05/21/2024] [Accepted: 06/01/2024] [Indexed: 06/21/2024] Open
Abstract
Metabolic dysfunction-associated fatty liver disease (MAFLD) is one of the most common chronic liver diseases worldwide. Some patients with MAFLD develop metabolic dysfunction-associated steatohepatitis (MASH), which can lead to severe liver fibrosis. However, the molecular mechanisms underlying this progression remain unknown, and no effective treatment for MASH has been developed so far. In this study, we performed a longitudinal detailed analysis of mitochondria in the livers of choline-deficient, methionine-defined, high-fat-diet (CDAHFD)-fed mice, which exhibited a MASH-like pathology. We found that FoF1-ATPase activity began to decrease in the mitochondria of CDAHFD-fed mice prior to alterations in the activity of mitochondrial respiratory chain complex, almost at the time of onset of liver fibrosis. In addition, the decrease in FoF1-ATPase activity coincided with the accelerated opening of the mitochondrial permeability transition pore (PTP), for which FoF1-ATPase might be a major component or regulator. As fibrosis progressed, mitochondrial permeability transition (PT) induced in CDAHFD-fed mice became less sensitive to cyclosporine A, a specific PT inhibitor. These results suggest that episodes of fibrosis might be related to the disruption of mitochondrial function via PTP opening, which is triggered by functional changes in FoF1-ATPase. These novel findings could help elucidate the pathogenesis of MASH and lead to the development of new therapeutic strategies.
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Affiliation(s)
- Akiko Yamada
- Department of Pathology, Nihon University School of Dentistry, Chiyoda-ku, Tokyo 101-8310, Japan
| | - Akira Watanabe
- Institute for Genome Research, Tokushima University, Kuramoto, Tokushima 770-8503, Japan
- Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Atsushi Nara
- Institute for Genome Research, Tokushima University, Kuramoto, Tokushima 770-8503, Japan
- Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Naozumi Ishimaru
- Department of Oral Pathology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan
| | - Kosuke Maeda
- Institute for Genome Research, Tokushima University, Kuramoto, Tokushima 770-8503, Japan
- Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Yusuke Ido
- Institute for Genome Research, Tokushima University, Kuramoto, Tokushima 770-8503, Japan
- Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Kazumasa Kotake
- Institute for Genome Research, Tokushima University, Kuramoto, Tokushima 770-8503, Japan
- Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Masatake Asano
- Department of Pathology, Nihon University School of Dentistry, Chiyoda-ku, Tokyo 101-8310, Japan
| | - Yasuo Shinohara
- Institute for Genome Research, Tokushima University, Kuramoto, Tokushima 770-8503, Japan
- Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Takenori Yamamoto
- Institute for Genome Research, Tokushima University, Kuramoto, Tokushima 770-8503, Japan
- Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
- Division of Molecular Target and Gene Therapy Products, National Institute of Health Sciences, Kawasaki-ku, Kanagawa 210-9501, Japan
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Takegawa K, Ito T, Yamamoto A, Yamazaki N, Shindo M, Shinohara Y. KH-17, a simplified derivative of bongkrekic acid, weakly inhibits the mitochondrial ADP/ATP carrier from both sides of the inner mitochondrial membrane. Chem Biol Drug Des 2023; 101:865-872. [PMID: 36527173 DOI: 10.1111/cbdd.14194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/21/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
Two natural products, bongkrekic acid and carboxyatractyloside, are known to specifically inhibit the mitochondrial ADP/ATP carrier from its matrix side and cytosolic side, respectively, in concentration ranges of 10-6 M. In the present study, we investigated the manner of action of a synthetic bongkrekic acid derivative, KH-17, lacking three methyl groups, one methoxy group, and five internal double bonds, on the mitochondrial ADP/ATP carrier. At slightly acidic pH, KH-17 inhibited mitochondrial [3 H]ADP uptake, but its inhibitory action was about 10 times weaker than that of its parental compound, bongkrekic acid. The main site of action of KH-17 was confirmed as the matrix side of the ADP/ATP carrier by experiments using submitochondrial particles, which have an inside-out orientation of the inner mitochondrial membrane. However, when we added KH-17 to mitochondria at neutral pH, it had a weak inhibitory effect on [3 H]ADP uptake, and its inhibitory strength was similar to that of bongkrekic acid. These results indicated that KH-17 weakly inhibits the ADP/ATP carrier not only from the matrix side but also from the cytosolic side. To ascertain whether this interpretation was correct, we examined the effects of KH-17 and carboxyatractyloside on mitochondrial [3 H]ADP uptake at two [3 H]ADP concentrations. We found that both KH-17 and carboxyatractyloside showed a stronger inhibitory effect at the lower [3 H]ADP concentration. Therefore, we concluded that the bongkrekic acid derivative, KH-17, weakly inhibits the mitochondrial ADP/ATP carrier from both sides of the inner mitochondrial membrane. These results suggested that the elimination of three methyl groups, one methoxy group, and five internal double bonds present in bongkrekic acid altered its manner of action towards the mitochondrial ADP/ATP carrier. Our data will help to improve our understanding of the interaction between bongkrekic acid and the mitochondrial ADP/ATP carrier.
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Affiliation(s)
- Kazuto Takegawa
- Institute for Genome Research, Institute of Advanced Medical Sciences, Tokushima University, Tokushima, Japan
- Graduate School of Pharmaceutical Sciences, Tokushima University, Tokushima, Japan
| | - Takeshi Ito
- Institute for Genome Research, Institute of Advanced Medical Sciences, Tokushima University, Tokushima, Japan
- Graduate School of Pharmaceutical Sciences, Tokushima University, Tokushima, Japan
| | - Atsushi Yamamoto
- Faculty of Pharmaceutical Sciences, Suzuka University of Medical Science, Suzuka, Japan
| | - Naoshi Yamazaki
- Graduate School of Pharmaceutical Sciences, Tokushima University, Tokushima, Japan
| | - Mitsuru Shindo
- Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Japan
| | - Yasuo Shinohara
- Institute for Genome Research, Institute of Advanced Medical Sciences, Tokushima University, Tokushima, Japan
- Graduate School of Pharmaceutical Sciences, Tokushima University, Tokushima, Japan
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Gbala ID, Macharia RW, Bargul JL, Magoma G. Membrane Permeabilization and Antimicrobial Activity of Recombinant Defensin-d2 and Actifensin against Multidrug-Resistant Pseudomonas aeruginosa and Candida albicans. Molecules 2022; 27:molecules27144325. [PMID: 35889198 PMCID: PMC9317813 DOI: 10.3390/molecules27144325] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 06/18/2022] [Accepted: 06/22/2022] [Indexed: 12/10/2022] Open
Abstract
Antimicrobial resistance requires urgent efforts towards the discovery of active antimicrobials, and the development of strategies to sustainably produce them. Defensin and defensin-like antimicrobial peptides (AMPs) are increasingly gaining pharmacological interest because of their potency against pathogens. In this study, we expressed two AMPs: defensin-d2 derived from spinach, and defensin-like actifensin from Actinomyces ruminicola. Recombinant pTXB1 plasmids carrying the target genes encoding defensin-d2 and actifensin were generated by the MEGAWHOP cloning strategy. Each AMP was first expressed as a fusion protein in Escherichia coli, purified by affinity chromatography, and was thereafter assayed for antimicrobial activity against multidrug-resistant (MDR) pathogens. Approximately 985 µg/mL and 2895 µg/mL of recombinant defensin-d2 and actifensin, respectively, were recovered with high purity. An analysis by MALDI-TOF MS showed distinct peaks corresponding to molecular weights of approximately 4.1 kDa for actifensin and 5.8 kDa for defensin-d2. An in vitro antimicrobial assay showed that MDR Pseudomonas aeruginosa and Candida albicans were inhibited at minimum concentrations of 7.5 µg/mL and 23 µg/mL for recombinant defensin-d2 and actifensin, respectively. The inhibitory kinetics of the peptides revealed cidal activity within 4 h of the contact time. Furthermore, both peptides exhibited an antagonistic interaction, which could be attributed to their affinities for similar ligands, as deduced by peptide–ligand profiling. Moreover, both peptides inhibited biofilm formation, and they exhibited no resistance potential and low hemolytic activity. The peptides also possess the ability to permeate and disrupt the cell membranes of MDR P. aeruginosa and C. albicans. Therefore, recombinant actifensin and defensin-d2 exhibit broad-spectrum antimicrobial activity and have the potential to be used as therapy against MDR pathogens.
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Affiliation(s)
- Ifeoluwa D. Gbala
- Molecular Biology and Biotechnology, Institute for Basic Sciences, Technology and Innovation, Pan African University, Nairobi P.O. Box 62000-00200, Kenya;
- Correspondence:
| | - Rosaline W. Macharia
- Centre for Biotechnology and Bioinformatics, University of Nairobi, Nairobi P.O. Box 30197-00100, Kenya;
| | - Joel L. Bargul
- Department of Biochemistry, Jomo Kenyatta University of Agriculture and Technology, Nairobi P.O. Box 62000-00200, Kenya;
- International Centre of Insect Physiology and Ecology, Nairobi P.O. Box 30772-00100, Kenya
| | - Gabriel Magoma
- Molecular Biology and Biotechnology, Institute for Basic Sciences, Technology and Innovation, Pan African University, Nairobi P.O. Box 62000-00200, Kenya;
- Department of Biochemistry, Jomo Kenyatta University of Agriculture and Technology, Nairobi P.O. Box 62000-00200, Kenya;
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Yamamoto T, Tsunoda M, Ozono M, Watanabe A, Kotake K, Hiroshima Y, Yamada A, Terada H, Shinohara Y. Polyethyleneimine renders mitochondrial membranes permeable by interacting with negatively charged phospholipids in them. Arch Biochem Biophys 2018; 652:9-17. [PMID: 29886045 DOI: 10.1016/j.abb.2018.06.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 06/05/2018] [Accepted: 06/06/2018] [Indexed: 01/21/2023]
Abstract
Polyethyleneimines (PEIs) are used for transfection of cells with nucleic acids. Meanwhile, the interaction of PEI with mitochondria causes cytochrome c release prior to apoptosis; the mechanisms how PEI causes this permeabilization of mitochondrial membranes and the release of cytochrome c remain unclear. To clarify these mechanisms, we examined the effects of branched-type PEI and linear-type PEI, each of which was 25 kDa in size, on mitochondria. The permeabilization potency of mitochondrial membranes by branched PEI was stronger than that by linear PEI. The permeabilization by PEIs were insensitive to permeability-transition inhibitors, indicating that PEI-induced permeabilization was not attributed to permeability transition. Meanwhile, PEIs caused permeabilization of artificial lipid vesicles; again, the permeabilization potency of branched PEI was stronger than that of linear PEI. Such a difference in this potency was close to that in the case of isolated mitochondria, signifying that the PEI-induced permeabilization of mitochondrial membranes could be attributed to PEI's interaction with the phospholipid phase. Furthermore, this PEI-induced permeabilization of the lipid vesicles was observed only in the case of lipid vesicles including negatively charged phospholipids. These results indicate that PEIs interacted with negatively charged phospholipids in the mitochondrial membranes to directly lead to their permeabilization.
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Affiliation(s)
- Takenori Yamamoto
- Institute for Genome Research, Tokushima University, Kuramotocho-3, Tokushima 770-8503, Japan; Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi-1, Tokushima 770-8505, Japan.
| | - Moe Tsunoda
- Institute for Genome Research, Tokushima University, Kuramotocho-3, Tokushima 770-8503, Japan; Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi-1, Tokushima 770-8505, Japan
| | - Mizune Ozono
- Institute for Genome Research, Tokushima University, Kuramotocho-3, Tokushima 770-8503, Japan; Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi-1, Tokushima 770-8505, Japan
| | - Akira Watanabe
- Institute for Genome Research, Tokushima University, Kuramotocho-3, Tokushima 770-8503, Japan; Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi-1, Tokushima 770-8505, Japan
| | - Kazumasa Kotake
- Institute for Genome Research, Tokushima University, Kuramotocho-3, Tokushima 770-8503, Japan; Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi-1, Tokushima 770-8505, Japan
| | - Yuka Hiroshima
- Institute for Genome Research, Tokushima University, Kuramotocho-3, Tokushima 770-8503, Japan
| | - Akiko Yamada
- School of Dentistry, Tokushima University, Kuramotocho-3, Tokushima 770-8504, Japan
| | - Hiroshi Terada
- Niigata University of Pharmacy and Applied Life Sciences, Niigata City 956-8603, Japan
| | - Yasuo Shinohara
- Institute for Genome Research, Tokushima University, Kuramotocho-3, Tokushima 770-8503, Japan; Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi-1, Tokushima 770-8505, Japan
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Yamamoto T, Yamada A, Yoshimura Y, Terada H, Shinohara Y. [The mechanisms of the release of cytochrome C from mitochondria revealed by proteomics analysis]. YAKUGAKU ZASSHI 2014; 132:1099-104. [PMID: 23037694 DOI: 10.1248/yakushi.12-00220-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mitochondrial permeability transition (PT) is the phenomenon in which the mitochondrial inner membrane becomes permeable to various solutes and ions. When PT is induced by Ca(2+), cytochrome c is released from mitochondria into the cytosol where it then triggers subsequent steps of programmed cell death, apoptosis. Thus, the proteins that regulate PT and cytochrome c release could become druggable targets for various diseases. However, the mechanisms of PT and the release of cytochrome c have not yet been revealed. We previously showed that valinomycin, a potassium selective ionophore, also caused release of cytochrome c from mitochondria without inducing PT. This result indicates that cytochrome c could be released from mitochondria with or without induction of PT. In this study, to understand the difference of effects of valinomycin and Ca(2+) on mitochondria, we examined what protein species are released from valinomycin- and Ca(2+)-treated mitochondria by LC-MS/MS. As a result, only the proteins located in the intermembrane space were found to be released from valinomycin-treated mitochondria, while those in both the intermembrane space and in the matrix were released from Ca(2+)-treated mitochondria. Furthermore, the protein releases by each reagent occurred not selectively but in a concentration-dependent manner. Based on these results, the permeabilization effects of Ca(2+) and valinomycin on the inner and outer mitochondrial membranes are discussed.
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Affiliation(s)
- Takenori Yamamoto
- Institute for Genome Research, University of Tokushima, Kuramoto-cho, Tokushima, Japan.
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S-15176 and its methylated derivative suppress the CsA-insensitive mitochondrial permeability transition and subsequent cytochrome c release induced by silver ion, and show weak protonophoric activity. Mol Cell Biochem 2011; 358:45-51. [DOI: 10.1007/s11010-011-0919-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Accepted: 06/07/2011] [Indexed: 10/18/2022]
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Zhang Y, Li RJ, Ying X, Tian W, Yao HJ, Men Y, Yu Y, Zhang L, Ju RJ, Wang XX, Zhou J, Chen JX, Li N, Lu WL. Targeting Therapy with Mitosomal Daunorubicin plus Amlodipine Has the Potential To Circumvent Intrinsic Resistant Breast Cancer. Mol Pharm 2010; 8:162-75. [DOI: 10.1021/mp100249x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Yan Zhang
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Ruo-Jing Li
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Xue Ying
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Wei Tian
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Hong-Juan Yao
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Ying Men
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Yang Yu
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Liang Zhang
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Rui-Jun Ju
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Xiao-Xing Wang
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Jia Zhou
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Jing-Xian Chen
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Nan Li
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Wan-Liang Lu
- State Key Laboratory of Natural and Biomimetic Drugs and School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
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Use of highly purified and mixed antibodies for simultaneous detection of multiple protein species released from mitochondria upon induction of the permeability transition. Appl Biochem Biotechnol 2010; 163:64-70. [PMID: 20582638 DOI: 10.1007/s12010-010-9016-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Accepted: 06/14/2010] [Indexed: 10/19/2022]
Abstract
Concomitant with the induction of the mitochondrial permeability transition (PT), cytochrome c is released from mitochondria into the cytosol where it triggers subsequent steps of cellular apoptosis. Thus, inducers of the mitochondrial PT would become "seed compounds" of regulators of apoptosis. However, when we examine the actions of certain chemicals on the release of mitochondrial cytochrome c, the behaviors of not only cytochrome c but also multiple mitochondrial protein species must be carefully examined because the mitochondrial PT and release of proteins from mitochondria occur in diverse manners. In the present study, we examined whether it is possible to measure the behaviors of multiple protein species in a single experiment using purified and mixed antibodies. The results obtained clearly indicate that this procedure would be applicable for high-throughput screening of regulators of apoptosis. Further requirements necessary for the establishment of a useful screening system for apoptosis regulators are discussed.
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Ca2+-induced permeability transition can be observed even in yeast mitochondria under optimized experimental conditions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2009; 1787:1486-91. [DOI: 10.1016/j.bbabio.2009.07.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Revised: 07/06/2009] [Accepted: 07/09/2009] [Indexed: 11/19/2022]
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Haruyama T, Asayama S, Kawakami H. Highly amphiphilic manganese porphyrin for the mitochondrial targeting antioxidant. J Biochem 2009; 147:153-6. [PMID: 19880373 DOI: 10.1093/jb/mvp172] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Here, we communicate that the design of the anti-oxidant consisting of amphiphilic manganese porphyrin with one dimethylimidazolium group and three phenyl groups for mitochondrion targeting. The resulting Mn-porphyrin MnMImP(3)P exhibited high partition coefficient (logP(ow) = +4.78) as well as significant superoxide dismutase and peroxynitrite decomposition activities. Accordingly, the MnMImP(3)P exhibited a little increase in fluorescence intensity attributed to 3,3'-dipropyl-2,2'-thiadicarbocyanine iodide [diS-C(3)-(5)], a tracer dye to assess the mitochondrial membrane potential, which suggested the interaction of the MnMImP(3)P, leading to the release of the fluorescence dye from the mitochondrial membrane, with the mitochondria. As a result, the MnMImP(3)P rescued the cell death under oxidative stress concerned with mitochondrial damage.
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Affiliation(s)
- Takayuki Haruyama
- Department of Applied Chemistry, Tokyo Metropolitan University, and 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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Yamada A, Yamamoto T, Yamazaki N, Yamashita K, Kataoka M, Nagata T, Terada H, Shinohara Y. Differential permeabilization effects of Ca2+ and valinomycin on the inner and outer mitochondrial membranes as revealed by proteomics analysis of proteins released from mitochondria. Mol Cell Proteomics 2009; 8:1265-77. [PMID: 19218587 DOI: 10.1074/mcp.m800377-mcp200] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
It is well established that cytochrome c is released from mitochondria when the permeability transition (PT) of this organelle is induced by Ca2+. Our previous study showed that valinomycin also caused the release of cytochrome c from mitochondria but without inducing this PT (Shinohara, Y., Almofti, M. R., Yamamoto, T., Ishida, T., Kita, F., Kanzaki, H., Ohnishi, M., Yamashita, K., Shimizu, S., and Terada, H. (2002) Permeability transition-independent release of mitochondrial cytochrome c induced by valinomycin. Eur. J. Biochem. 269, 5224-5230). These results indicate that cytochrome c may be released from mitochondria with or without the induction of PT. In the present study, we examined the protein species released from valinomycin- and Ca2+-treated mitochondria by LC-MS/MS analysis. As a result, the proteins located in the intermembrane space were found to be specifically released from valinomycin-treated mitochondria, whereas those in the intermembrane space and in the matrix were released from Ca2+-treated mitochondria. These results were confirmed by Western analysis. Furthermore to examine how the protein release occurred, we examined the correlation between the species of released proteins and those of the abundant proteins in mitochondria. Consequently most of the proteins released from mitochondria treated with either agent were highly expressed proteins in mitochondria, indicating that the release occurred not selectively but in a manner dependent on the concentration of the proteins. Based on these results, the permeabilization effects of Ca2+ and valinomycin on the inner and outer mitochondrial membranes are discussed.
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Affiliation(s)
- Akiko Yamada
- double daggerSchool of Dentistry, University of Tokushima, Kuramotocho-3, Tokushima 770-8504, Japan
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12
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Distinct behaviors of adenylate kinase and cytochrome c observed following induction of mitochondrial permeability transition by Ca2+ in the absence of respiratory substrate. J Bioenerg Biomembr 2009; 40:619-23. [DOI: 10.1007/s10863-008-9190-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2008] [Accepted: 12/09/2008] [Indexed: 11/25/2022]
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Yamamoto T, Terauchi S, Tachikawa A, Yamashita K, Kataoka M, Terada H, Shinohara Y. Two critical factors affecting the release of mitochondrial cytochrome C as revealed by studies using N,N'-dicyclohexylcarbodiimide as an atypical inducer of permeability transition. J Bioenerg Biomembr 2006; 37:299-306. [PMID: 16341774 DOI: 10.1007/s10863-005-8641-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2005] [Accepted: 08/18/2005] [Indexed: 10/25/2022]
Abstract
N,N'-dicyclohexylcarbodiimide (DCCD) was earlier reported to have stimulatory effects on mitochondrial respiration and to induce mitochondrial swelling, when it was added to mitochondrial suspensions. These data seem to imply that DCCD caused the mitochondrial permeability transition (PT), but this possibility had never been investigated. In the present study, effects of DCCD on the mitochondrial structure and function were studied in detail. DCCD was found to induce mitochondrial PT in a cyclosporine A-insensitive manner. Electron microscopic analysis also supported the induction of the mitochondrial PT by DCCD. However, different from many other PT inducers, DCCD failed to cause massive release of mitochondrial cytochrome c. To understand the relationship between the induction of mitochondrial PT and the release of mitochondrial cytochrome c, we compared the actions of DCCD on mitochondrial structure and function with those of Ca2+, known as an ordinary PT inducer. As a result, two parameters considered to be critical for controlling the release of mitochondrial cytochrome c on the induction of PT were mitochondrial volume and the velocity of mitochondrial oxygen consumption.
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Affiliation(s)
- Takenori Yamamoto
- Institute for Genome Research, University of Tokushima, Tokushima, 770-8503, Japan
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14
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Terauchi S, Yamamoto T, Yamashita K, Kataoka M, Terada H, Shinohara Y. Molecular basis of morphological changes in mitochondrial membrane accompanying induction of permeability transition, as revealed by immuno-electron microscopy. Mitochondrion 2005; 5:248-54. [PMID: 16050987 DOI: 10.1016/j.mito.2005.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2005] [Revised: 03/23/2005] [Accepted: 04/12/2005] [Indexed: 11/16/2022]
Abstract
The mitochondrial inner membrane typically shows a condensed structure when examined by electron microscopy. However, this typical structure is known to disappear upon induction of the mitochondrial permeability transition (PT). This change in the appearance of the mitochondrial membrane structure that accompanies the induction of PT is thought to reflect changes in the permeability of inner mitochondrial membrane; however, its molecular basis has remained uncertain. In the present study, changes in membrane status were examined by immuno-electron microscopy using antibodies against the voltage-dependent anion channel (VDAC), beta-subunit of F1-ATPase (F1beta), and cytochrome c (cyt. c). In control mitochondria, antibody against VDAC was observed at the rim of the mitochondria, whereas antibodies against F1beta and cytochrome c bound these molecules inside of the mitochondria. However, in PT-induced mitochondria, all three antibodies were observed at the mitochondrial rim. These results strongly suggest that the inner mitochondrial membrane is shoved to the rim region of mitochondria upon induction of mitochondrial PT.
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Affiliation(s)
- Satsuki Terauchi
- Institute for Genome Research, University of Tokushima, Kuramotocho-3, Tokushima 770-8503, Japan
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