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Su SH, Su SJ, Huang LY, Chiang YC. Leukemic cells resist lysosomal inhibition through the mitochondria-dependent reduction of intracellular pH and oxidants. Free Radic Biol Med 2023; 198:1-11. [PMID: 36736442 DOI: 10.1016/j.freeradbiomed.2023.01.025] [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: 01/02/2023] [Revised: 01/18/2023] [Accepted: 01/28/2023] [Indexed: 02/01/2023]
Abstract
Acidic lysosomes are indispensable for cancer development and linked to chemotherapy resistance. Chloroquine (CQ) and functional analogues have been considered as a potential solution to overcome the cancer progression and chemoresistance by inhibiting the lysosome-mediated autophagy and multidrug exocytosis. However, their anti-cancer efficacy in most clinical trials demonstrated modest improvement. In this study, we investigated the detailed mechanisms underlying the acquired resistance of K562 leukemic cells to CQ treatment. In response to 5-80 μM CQ, the lumen pH of endosomal-lysosomal system immediately increased and gradually reached dynamic equilibrium within 24 h. Leukemic cells produced more acidic organelles to tolerate 5-10 μM CQ. CQ (20-80 μM) concentration-dependently triggered cytosolic pH (pHi) rise, G0/G1 arrest, mitochondrial depolarization/fragmentation, and necrotic/apoptotic cell death. Oxidant induction by CQ was responsible for the mitochondria-dependent cytotoxicity and partial pHi elevation. Cells that survived the CQ cytotoxicity were accompanied with increased mitochondria. Under the 80 μM CQ challenge, co-treatment with the inhibitor of F0 part of mitochondrial H+-ATP synthase, oligomycin (40 nM), prevented the elevation of oxidants as well as pHi, and attenuated stresses on mitochondria, cell survival, and cell proliferation. Besides, oligomycin-treated cells obviously displayed the lysosomal peripheralization and plasma membrane blebbing, suggesting that these cells were in process of lysosomal exocytosis and microvesicle release. Enhanced motion of these secretory processes allowed the cells to exclude CQ and repair necrotic injury. Together, the oxidant production and the proton dynamic interconnection among lysosomes, mitochondria, and cytosol are crucial for leukemic susceptibility to lysosomotropic chemotherapeutics.
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Affiliation(s)
- Shu-Hui Su
- Department of Molecular Biology and Human Genetics, College of Medicine, Tzu Chi University, Hualien, Taiwan; Department of Laboratory Medicine and Biotechnology, College of Medicine, Tzu Chi University, Hualien, Taiwan.
| | - Shu-Jem Su
- Department of Medical Laboratory Science and Biotechnology, School of Medicine and Health Sciences, FooYin University, Kaohsiung, Taiwan
| | - Li-Yun Huang
- Department of Laboratory Medicine and Biotechnology, College of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Yun-Chen Chiang
- Department of Molecular Biology and Human Genetics, College of Medicine, Tzu Chi University, Hualien, Taiwan
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2
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Zhuan Q, Li J, Du X, Zhang L, Meng L, Luo Y, Zhou D, Liu H, Wan P, Hou Y, Fu X. Antioxidant procyanidin B2 protects oocytes against cryoinjuries via mitochondria regulated cortical tension. J Anim Sci Biotechnol 2022; 13:95. [PMID: 35971139 PMCID: PMC9380387 DOI: 10.1186/s40104-022-00742-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 06/05/2022] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND Irreversible cryodamage caused by oocyte vitrification limited its wild application in female fertility preservation. Antioxidants were always used to antagonist the oxidative stress caused by vitrification. However, the comprehensive mechanism underlying the protective role of antioxidants has not been studied. Procyanidin B2 (PCB2) is a potent natural antioxidant and its functions in response to vitrification are still unknown. In this study, the effects of PCB2 on vitrified-thawed oocytes and subsequent embryo development were explored, and the mechanisms underlying the protective role of PCB2 were systematically elucidated. RESULTS Vitrification induced a marked decline in oocyte quality, while PCB2 could improve oocyte viability and further development after parthenogenetic activation. A subsequent study indicated that PCB2 effectively attenuated vitrification-induced oxidative stress, rescued mitochondrial dysfunction, and improved cell viability. Moreover, PCB2 also acts as a cortical tension regulator apart from strong antioxidant properties. Increased cortical tension caused by PCB2 would maintain normal spindle morphology and promote migration, ensure correct meiosis progression and finally reduce the aneuploidy rate in vitrified oocytes. Further study reveals that ATP biosynthesis plays a crucial role in cortical tension regulation, and PCB2 effectively increased the cortical tension through the electron transfer chain pathway. Additionally, PCB2 would elevate the cortical tension in embryo cells at morula and blastocyst stages and further improve blastocyst quality. What's more, targeted metabolomics shows that PCB2 has a beneficial effect on blastocyst formation by mediating saccharides and amino acids metabolism. CONCLUSIONS Antioxidant PCB2 exhibits multi-protective roles in response to vitrification stimuli through mitochondria-mediated cortical tension regulation.
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Affiliation(s)
- Qingrui Zhuan
- grid.22935.3f0000 0004 0530 8290Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture and Rural Affairs, Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Jun Li
- grid.452458.aDepartment of Reproductive Medicine, Reproductive Medical Center, The First Hospital of Hebei Medical University, Shijiazhuang, Hebei China
| | - Xingzhu Du
- grid.22935.3f0000 0004 0530 8290Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture and Rural Affairs, Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Luyao Zhang
- grid.22935.3f0000 0004 0530 8290State Key Laboratories of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Lin Meng
- grid.22935.3f0000 0004 0530 8290State Key Laboratories of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Yuwen Luo
- grid.22935.3f0000 0004 0530 8290Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture and Rural Affairs, Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Dan Zhou
- grid.22935.3f0000 0004 0530 8290Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture and Rural Affairs, Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Hongyu Liu
- grid.22935.3f0000 0004 0530 8290Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture and Rural Affairs, Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Pengcheng Wan
- grid.469620.f0000 0004 4678 3979State Key Laboratory of Sheep Genetic Improvement and Healthy Breeding, Institute of Animal Husbandry and Veterinary Sciences, Xinjiang Academy of Agricultural and Reclamation Sciences, Shihhotze, China
| | - Yunpeng Hou
- grid.22935.3f0000 0004 0530 8290State Key Laboratories of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Xiangwei Fu
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture and Rural Affairs, Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China. .,State Key Laboratory of Sheep Genetic Improvement and Healthy Breeding, Institute of Animal Husbandry and Veterinary Sciences, Xinjiang Academy of Agricultural and Reclamation Sciences, Shihhotze, China.
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3
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Bekebrede AF, Keijer J, Gerrits WJJ, de Boer VCJ. Mitochondrial and glycolytic extracellular flux analysis optimization for isolated pig intestinal epithelial cells. Sci Rep 2021; 11:19961. [PMID: 34620944 PMCID: PMC8497502 DOI: 10.1038/s41598-021-99460-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 09/01/2021] [Indexed: 02/07/2023] Open
Abstract
Intestinal epithelial cells (IECs) are crucial to maintain intestinal function and the barrier against the outside world. To support their function they rely on energy production, and failure to produce enough energy can lead to IEC malfunction and thus decrease intestinal barrier function. However, IEC metabolic function is not often used as an outcome parameter in intervention studies, perhaps because of the lack of available methods. We therefore developed a method to isolate viable IECs, suitable to faithfully measure their metabolic function by determining extracellular glycolytic and mitochondrial flux. First, various methods were assessed to obtain viable IECs. We then adapted a previously in-house generated image-analysis algorithm to quantify the amount of seeded IECs. Correcting basal respiration data of a group of piglets using this algorithm reduced the variation, showing that this algorithm allows for more accurate analysis of metabolic function. We found that delay in metabolic analysis after IEC isolation decreases their metabolic function and should therefore be prevented. The presence of antibiotics during isolation and metabolic assessment also decreased the metabolic function of IECs. Finally, we found that primary pig IECs did not respond to Oligomycin, a drug that inhibits complex V of the electron transport chain, which may be because of the presence of drug exporters. A method was established to faithfully measure extracellular glycolytic and mitochondrial flux of pig primary IECs. This tool is suitable to gain a better understanding of how interventions affect IEC metabolic function.
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Affiliation(s)
- A F Bekebrede
- Human and Animal Physiology, Wageningen University and Research, 6708 WD, Wageningen, The Netherlands.,Animal Nutrition Group, Wageningen University and Research, 6708 WD, Wageningen, The Netherlands
| | - J Keijer
- Human and Animal Physiology, Wageningen University and Research, 6708 WD, Wageningen, The Netherlands
| | - W J J Gerrits
- Animal Nutrition Group, Wageningen University and Research, 6708 WD, Wageningen, The Netherlands
| | - V C J de Boer
- Human and Animal Physiology, Wageningen University and Research, 6708 WD, Wageningen, The Netherlands.
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Gao C, Chen X, Yu L, Jiang L, Pan D, Jiang S, Gan Y, Liu Y, Yi X. New 24-Membered Macrolactins Isolated from Marine Bacteria Bacillus siamensis as Potent Fungal Inhibitors against Sugarcane Smut. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:4392-4401. [PMID: 33834775 DOI: 10.1021/acs.jafc.0c07415] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Sugarcane smut, caused by Sporisorium scitamineum, is one of the most devastating fungal diseases affecting sugarcane worldwide. To develop a potent sugarcane smut fungicide, secondary metabolites of marine-derived Bacillus siamensis were isolated and screened for inhibitory activities, which led to the discovery of five new 24-membered macrolactins, bamemacrolactins A-E (1-5), with 3 being the most potent inhibitor. The antifungal mechanism of 3 was studied by assessing its effects on mycelial morphology and the cell wall. Differential proteomics were used to analyze proteins in S. scitamineum upon treatment with bamemacrolactin C and to elucidate its antifungal mechanism. A total of 533 differentially expressed proteins were found. After the Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway analyses, eight target proteins were selected, and their functions were discussed. Six of the eight proteins were reported as antifungal targets. The target proteins are involved in the oxidative phosphorylation pathway. Therefore, the potent inhibition of S. scitamineum by compound 3 is most likely through oxidative phosphorylation and targeting a series of enzymes.
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Affiliation(s)
- Chenghai Gao
- Institute of Marine Drugs, School of Pharmaceutical Sciences, Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, NO. 13 Wuhe Rood, Nanning 530200, China
| | - Xianqiang Chen
- Institute of Marine Drugs, School of Pharmaceutical Sciences, Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, NO. 13 Wuhe Rood, Nanning 530200, China
| | - Lian Yu
- Institute of Marine Drugs, School of Pharmaceutical Sciences, Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, NO. 13 Wuhe Rood, Nanning 530200, China
| | - Lei Jiang
- Institute of Marine Drugs, School of Pharmaceutical Sciences, Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, NO. 13 Wuhe Rood, Nanning 530200, China
| | - Dongjin Pan
- Institute of Marine Drugs, School of Pharmaceutical Sciences, Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, NO. 13 Wuhe Rood, Nanning 530200, China
| | - Shu Jiang
- Institute of Marine Drugs, School of Pharmaceutical Sciences, Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, NO. 13 Wuhe Rood, Nanning 530200, China
| | - Yuman Gan
- Institute of Marine Drugs, School of Pharmaceutical Sciences, Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, NO. 13 Wuhe Rood, Nanning 530200, China
| | - Yonghong Liu
- Institute of Marine Drugs, School of Pharmaceutical Sciences, Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, NO. 13 Wuhe Rood, Nanning 530200, China
| | - Xiangxi Yi
- Institute of Marine Drugs, School of Pharmaceutical Sciences, Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, NO. 13 Wuhe Rood, Nanning 530200, China
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Chakraborty M, Mahmud NU, Muzahid ANM, Rabby SMF, Islam T. Oligomycins inhibit Magnaporthe oryzae Triticum and suppress wheat blast disease. PLoS One 2020; 15:e0233665. [PMID: 32804955 PMCID: PMC7430738 DOI: 10.1371/journal.pone.0233665] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 07/29/2020] [Indexed: 02/05/2023] Open
Abstract
Oligomycins are macrolide antibiotics, produced by Streptomyces spp. that show antagonistic effects against several microorganisms such as bacteria, fungi, nematodes and the oomycete Plasmopara viticola. Conidiogenesis, germination of conidia and formation of appressoria are determining factors pertaining to pathogenicity and successful diseases cycles of filamentous fungal phytopathogens. The goal of this research was to evaluate the in vitro suppressive effects of two oligomycins, oligomycin B and F along with a commercial fungicide Nativo® 75WG on hyphal growth, conidiogenesis, conidial germination, and appressorial formation of the wheat blast fungus, Magnaporthe oryzae Triticum (MoT) pathotype. We also determined the efficacy of these two oligomycins and the fungicide product in vivo in suppressing wheat blast with a detached leaf assay. Both oligomycins suppressed the growth of MoT mycelium in a dose dependent manner. Between the two natural products, oligomycin F provided higher inhibition of MoT hyphal growth compared to oligomycin B with a minimum inhibitory concentration of 0.005 and 0.05 μg/disk, respectively. The application of the compounds completely halted conidial formation of the MoT mycelium in agar medium. Further bioassays showed that these compounds significantly inhibited MoT conidia germination and induced lysis. The compounds also caused abnormal germ tube formation and suppressed appressorial formation of germinated spores. Interestingly, the application of these macrolides significantly inhibited wheat blast on detached leaves of wheat. This is the first report on the inhibition of mycelial growth, conidiogenesis, germination of conidia, deleterious morphological changes in germinated conidia, and suppression of blast disease of wheat by oligomycins from Streptomyces spp. Further study is needed to unravel the precise mode of action of these natural compounds and consider them as biopesticides for controlling wheat blast.
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Affiliation(s)
- Moutoshi Chakraborty
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - Nur Uddin Mahmud
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - Abu Naim Md. Muzahid
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - S. M. Fajle Rabby
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - Tofazzal Islam
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
- * E-mail:
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6
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Mitochondrial Genome Variation Affects Multiple Respiration and Nonrespiration Phenotypes in Saccharomyces cerevisiae. Genetics 2018; 211:773-786. [PMID: 30498022 DOI: 10.1534/genetics.118.301546] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 11/20/2018] [Indexed: 02/07/2023] Open
Abstract
Mitochondrial genome variation and its effects on phenotypes have been widely analyzed in higher eukaryotes but less so in the model eukaryote Saccharomyces cerevisiae Here, we describe mitochondrial genome variation in 96 diverse S. cerevisiae strains and assess associations between mitochondrial genotype and phenotypes as well as nuclear-mitochondrial epistasis. We associate sensitivity to the ATP synthase inhibitor oligomycin with SNPs in the mitochondrially encoded ATP6 gene. We describe the use of iso-nuclear F1 pairs, the mitochondrial genome equivalent of reciprocal hemizygosity analysis, to identify and analyze mitochondrial genotype-dependent phenotypes. Using iso-nuclear F1 pairs, we analyze the oligomycin phenotype-ATP6 association and find extensive nuclear-mitochondrial epistasis. Similarly, in iso-nuclear F1 pairs, we identify many additional mitochondrial genotype-dependent respiration phenotypes, for which there was no association in the 96 strains, and again find extensive nuclear-mitochondrial epistasis that likely contributes to the lack of association in the 96 strains. Finally, in iso-nuclear F1 pairs, we identify novel mitochondrial genotype-dependent nonrespiration phenotypes: resistance to cycloheximide, ketoconazole, and copper. We discuss potential mechanisms and the implications of mitochondrial genotype and of nuclear-mitochondrial epistasis effects on respiratory and nonrespiratory quantitative traits.
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7
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Sima N, Sun W, Gorshkov K, Shen M, Huang W, Zhu W, Xie X, Zheng W, Cheng X. Small Molecules Identified from a Quantitative Drug Combinational Screen Resensitize Cisplatin's Response in Drug-Resistant Ovarian Cancer Cells. Transl Oncol 2018; 11:1053-1064. [PMID: 29982103 PMCID: PMC6034569 DOI: 10.1016/j.tranon.2018.06.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2018] [Revised: 06/10/2018] [Accepted: 06/11/2018] [Indexed: 12/29/2022] Open
Abstract
Drug resistance to chemotherapy occurs in many ovarian cancer patients resulting in failure of treatment. Exploration of drug resistance mechanisms and identification of new therapeutics that overcome the drug resistance can improve patient prognosis. Following a quantitative combination screen of 6060 approved drugs and bioactive compounds in a cisplatin-resistant A2780-cis ovarian cancer cell line, 38 active compounds with IC50s under 1 μM suppressed the growth of cisplatin-resistant ovarian cancer cells. Among these confirmed compounds, CUDC-101, OSU-03012, oligomycin A, VE-821, or Torin2 in a combination with cisplatin restored cisplatin's apoptotic response in the A2780-cis cells, while SR-3306, GSK-923295, SNX-5422, AT-13387, and PF-05212384 directly suppressed the growth of A2780-cis cells. One of the mechanisms for overcoming cisplatin resistance in these cells is mediated by the inhibition of epidermal growth factor receptor (EGFR), though not all the EGFR inhibitors are equally active. The increased levels of total EGFR and phosphorylated-EGFR (p-EGFR) in the A2780-cis cells were reduced after the combined treatment of cisplatin with EGFR inhibitors. In addition, a knockdown of EGFR mRNA reduced cisplatin resistance in the A2780-cis cells. Therefore, the top active compounds identified in this work can be studied further as potential treatments for cisplatin-resistant ovarian cancer. The quantitative combinational screening approach is a useful method for identifying effective compounds and drug combinations against drug-resistant cancer cells.
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Affiliation(s)
- Ni Sima
- Department of Gynecologic Oncology, Women's Reproductive Health Laboratory of Zhejiang Province, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, PR China; National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, USA
| | - Wei Sun
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, USA
| | - Kirill Gorshkov
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, USA
| | - Min Shen
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, USA
| | - Wei Huang
- Department of Gynecologic Oncology, Women's Reproductive Health Laboratory of Zhejiang Province, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, PR China; National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, USA
| | - Wenge Zhu
- Department of Biochemistry and Molecular Biology, The George Washington University Medical School, Washington, DC
| | - Xing Xie
- Department of Gynecologic Oncology, Women's Reproductive Health Laboratory of Zhejiang Province, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, PR China
| | - Wei Zheng
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, USA.
| | - Xiaodong Cheng
- Department of Gynecologic Oncology, Women's Reproductive Health Laboratory of Zhejiang Province, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, PR China.
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8
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Nesci S, Trombetti F, Ventrella V, Pirini M, Pagliarani A. Kinetic properties of the mitochondrial F 1 F O -ATPase activity elicited by Ca 2+ in replacement of Mg 2+. Biochimie 2017; 140:73-81. [DOI: 10.1016/j.biochi.2017.06.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 06/22/2017] [Indexed: 12/24/2022]
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9
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Dame ZT, Islam MT, Helmke E, von Tiedemann A, Laatsch H. Oligomycins and pamamycin homologs impair motility and induce lysis of zoospores of the grapevine downy mildew pathogen,Plasmopara viticola. FEMS Microbiol Lett 2016; 363:fnw167. [DOI: 10.1093/femsle/fnw167] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/24/2016] [Indexed: 11/12/2022] Open
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10
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The c-Ring of the F1FO-ATP Synthase: Facts and Perspectives. J Membr Biol 2015; 249:11-21. [PMID: 26621635 DOI: 10.1007/s00232-015-9860-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 11/19/2015] [Indexed: 10/22/2022]
Abstract
The F1FO-ATP synthase is the only enzyme in nature endowed with bi-functional catalytic mechanism of synthesis and hydrolysis of ATP. The enzyme functions, not only confined to energy transduction, are tied to three intrinsic features of the annular arrangement of c subunits which constitutes the so-called c-ring, the core of the membrane-embedded FO domain: (i) the c-ring constitution is linked to the number of ions (H(+) or Na(+)) channeled across the membrane during the dissipation of the transmembrane electrochemical gradient, which in turn determines the species-specific bioenergetic cost of ATP, the "molecular currency unit" of energy transfer in all living beings; (ii) the c-ring is increasingly involved in the mitochondrial permeability transition, an event linked to cell death and to most mitochondrial dysfunctions; (iii) the c subunit species-specific amino acid sequence and susceptibility to post-translational modifications can address antibacterial drug design according to the model of enzyme inhibitors which target the c subunits. Therefore, the simple c-ring structure not only allows the F1FO-ATP synthase to perform the two opposite tasks of molecular machine of cell life and death, but it also amplifies the enzyme's potential role as a drug target.
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11
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Xavier JM, Morgado AL, Rodrigues CM, Solá S. Tauroursodeoxycholic acid increases neural stem cell pool and neuronal conversion by regulating mitochondria-cell cycle retrograde signaling. Cell Cycle 2015; 13:3576-89. [PMID: 25483094 DOI: 10.4161/15384101.2014.962951] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The low survival and differentiation rates of stem cells after either transplantation or neural injury have been a major concern of stem cell-based therapy. Thus, further understanding long-term survival and differentiation of stem cells may uncover new targets for discovery and development of novel therapeutic approaches. We have previously described the impact of mitochondrial apoptosis-related events in modulating neural stem cell (NSC) fate. In addition, the endogenous bile acid, tauroursodeoxycholic acid (TUDCA) was shown to be neuroprotective in several animal models of neurodegenerative disorders by acting as an anti-apoptotic and anti-oxidant molecule at the mitochondrial level. Here, we hypothesize that TUDCA might also play a role on NSC fate decision. We found that TUDCA prevents mitochondrial apoptotic events typical of early-stage mouse NSC differentiation, preserves mitochondrial integrity and function, while enhancing self-renewal potential and accelerating cell cycle exit of NSCs. Interestingly, TUDCA prevention of mitochondrial alterations interfered with NSC differentiation potential by favoring neuronal rather than astroglial conversion. Finally, inhibition of mitochondrial reactive oxygen species (mtROS) scavenger and adenosine triphosphate (ATP) synthase revealed that the effect of TUDCA is dependent on mtROS and ATP regulation levels. Collectively, these data underline the importance of mitochondrial stress control of NSC fate decision and support a new role for TUDCA in this process.
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Key Words
- ATP
- ATP, adenosine triphosphate
- BrdU, bromodeoxyuridine
- CsA, cyclosporin A
- DiOC6(3), 3, 3′-dihexyloxacarbocyanine iodide
- FACS, fluorescence-activated cell sorting analysis
- GAPDH, glyceraldehyde 3-phosphate dehydrogenase
- GFAP, glial fibrillary acidic protein
- MnSOD, manganese superoxide dismutase
- NSC, neural stem cells
- OGG1, 8-oxoguanine DNA glycosylase
- OligA, oligomycin A
- ROS, reactive oxygen species
- Sox2, sex determining region Y- box 2
- TUDCA, tauroursodeoxycholic acid
- UDCA, ursodeoxycholic acid
- VDAC, voltage-dependent anion channel
- cdk, cyclin-dependent kinase
- cell cycle
- mitochondrial oxidative stress
- mtDNA, mitochondrial DNA
- mtROS, mitochondrial reactive oxygen species
- neural stem cell fate
- tauroursodeoxycholic acid
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Affiliation(s)
- Joana M Xavier
- a Research Institute for Medicines (iMed.ULisboa) ; Faculty of Pharmacy ; Universidade de Lisboa ; Lisbon , Portugal
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12
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Phenotypic screening of a library of compounds against metastatic and non-metastatic clones of a canine mammary gland tumour cell line. Vet J 2015; 205:288-96. [DOI: 10.1016/j.tvjl.2015.04.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 03/30/2015] [Accepted: 04/19/2015] [Indexed: 01/30/2023]
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13
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Saeki K, Watanabe M, Tsuboi M, Sugano S, Yoshitake R, Tanaka Y, Ong SM, Saito T, Matsumoto K, Fujita N, Nishimura R, Nakagawa T. Anti-tumour effect of metformin in canine mammary gland tumour cells. Vet J 2015; 205:297-304. [PMID: 25981932 DOI: 10.1016/j.tvjl.2015.04.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 04/07/2015] [Accepted: 04/19/2015] [Indexed: 01/06/2023]
Abstract
Metformin is an oral hypoglycaemic drug used in type 2 diabetes. Its pharmacological activity reportedly involves mitochondrial respiratory complex I, and mitochondrial respiratory complex inhibitors have a strong inhibitory effect on the growth of metastatic canine mammary gland tumour (CMGT) cell lines. It is hypothesised that metformin has selective anti-tumour effects on metastatic CMGT cells. The aim of this study was to investigate the in vitro effect of metformin on cell growth, production of ATP and reactive oxygen species (ROS), and the AMP-activated protein kinase (AMPK) mammalian target of rapamycin (mTOR) pathway in two CMGT clonal cell lines with different metastatic potential. In addition, transcriptome analysis was used to determine cellular processes disrupted by metformin and in vivo anti-tumour effects were examined in a mouse xenograft model. Metformin inhibited CMGT cell growth in vitro, with the metastatic clone (CHMp-5b) displaying greater sensitivity. ATP depletion and ROS elevation were observed to a similar extent in the metastatic and non-metastatic (CHMp-13a) cell lines after metformin exposure. However, subsequent AMPK activation and mTOR pathway inhibition were prominent only in metformin-insensitive non-metastatic cells. Microarray analysis revealed inhibition of cell cycle progression by metformin treatment in CHMp-5b cells, which was further confirmed by Western blotting and cell cycle analysis. Additionally, metformin significantly suppressed tumour growth in xenografted metastatic CMGT cells. In conclusion, metformin exhibited an anti-tumour effect in metastatic CMGT cells through AMPK-independent cell cycle arrest. Its mechanism of action differed in the non-metastatic clone, where AMPK activation and mTOR inhibition were observed.
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Affiliation(s)
- K Saeki
- Laboratory of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - M Watanabe
- Department of Medical Genome Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
| | - M Tsuboi
- Laboratory of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - S Sugano
- Department of Medical Genome Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
| | - R Yoshitake
- Laboratory of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Y Tanaka
- Laboratory of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - S M Ong
- Laboratory of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - T Saito
- Laboratory of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - K Matsumoto
- Laboratory of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - N Fujita
- Laboratory of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - R Nishimura
- Laboratory of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - T Nakagawa
- Laboratory of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
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14
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Alekseeva MG, Mironcheva TA, Mavletova DA, Elizarov SM, Zakharevich NV, Danilenko VN. FoF1-ATP synthase of Streptomyces fradiae ATCC 19609: Structural, biochemical, and functional characterization. BIOCHEMISTRY (MOSCOW) 2015; 80:296-309. [DOI: 10.1134/s0006297915030050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Thiol oxidation of mitochondrial FO-c subunits: A way to switch off antimicrobial drug targets of the mitochondrial ATP synthase. Med Hypotheses 2014; 83:160-5. [DOI: 10.1016/j.mehy.2014.05.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Accepted: 05/10/2014] [Indexed: 12/30/2022]
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16
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Yen HC, Liu CC, Kan CC, Chen CS, Wei HR. Suppression of coenzyme Q₁₀ levels and the induction of multiple PDSS and COQ genes in human cells following oligomycin treatment. Free Radic Res 2014; 48:1125-34. [PMID: 25002068 DOI: 10.3109/10715762.2014.936865] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Endogenous coenzyme Q10 (CoQ10) is a lipid-soluble antioxidant and essential for the electron transport chain. We previously demonstrated that hydrogen peroxide enhanced CoQ10 levels, whereas disruption of mitochondrial membrane potential by a chemical uncoupler suppressed CoQ10 levels, in human 143B cells. In this study, we investigated how CoQ10 levels and expression of two PDSS and eight COQ genes were affected by oligomycin, which inhibited ATP synthesis at Complex V without uncoupling the mitochondria. We confirmed that oligomycin increased the production of reactive oxygen species (ROS) and decreased mitochondria-dependent ATP production in 143B cells. We also demonstrated that CoQ10 levels were decreased by oligomycin after 42 or 48 h of treatment, but not at earlier time points. Expression of PDSS2 and COQ2-COQ9 were up-regulated after 18-hour oligomycin treatment, and the expression of PPARGC1A (PGC1-1α) elevated concurrently. Knockdown of PPARGC1A down-regulated the basal mRNA levels of PDSS2 and five COQ genes and suppressed the induction of COQ8 and COQ9 genes by oligomycin, but did not affect CoQ10 levels under these conditions. N-acetylcysteine suppressed the augmentation of ROS levels and the enhanced expression of COQ2, COQ4, COQ7, and COQ9 induced by oligomycin, but did not modulate the changes in CoQ10 levels. These results suggested that the condition of mitochondrial dysfunction induced by oligomycin decreased CoQ10 levels independent of oxidative stress. Up-regulation of PDSS2 and several COQ genes by oligomycin might be regulated by multiple mechanisms, including the signaling pathways mediated by PGC-1α and ROS, but it would not restore CoQ10 levels.
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Affiliation(s)
- H-C Yen
- Department and Graduate Institute of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University , Taoyuan , Taiwan
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17
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Lytovchenko O, Naumenko N, Oeljeklaus S, Schmidt B, von der Malsburg K, Deckers M, Warscheid B, van der Laan M, Rehling P. The INA complex facilitates assembly of the peripheral stalk of the mitochondrial F1Fo-ATP synthase. EMBO J 2014; 33:1624-38. [PMID: 24942160 DOI: 10.15252/embj.201488076] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Mitochondrial F1Fo-ATP synthase generates the bulk of cellular ATP. This molecular machine assembles from nuclear- and mitochondria-encoded subunits. Whereas chaperones for formation of the matrix-exposed hexameric F1-ATPase core domain have been identified, insight into how the nuclear-encoded F1-domain assembles with the membrane-embedded Fo-region is lacking. Here we identified the INA complex (INAC) in the inner membrane of mitochondria as an assembly factor involved in this process. Ina22 and Ina17 are INAC constituents that physically associate with the F1-module and peripheral stalk, but not with the assembled F1Fo-ATP synthase. Our analyses show that loss of Ina22 and Ina17 specifically impairs formation of the peripheral stalk that connects the catalytic F1-module to the membrane embedded Fo-domain. We conclude that INAC represents a matrix-exposed inner membrane protein complex that facilitates peripheral stalk assembly and thus promotes a key step in the biogenesis of mitochondrial F1Fo-ATP synthase.
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Affiliation(s)
- Oleksandr Lytovchenko
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Nataliia Naumenko
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Silke Oeljeklaus
- Department of Biochemistry and Functional Proteomics, Faculty for Biology, University of Freiburg, Freiburg, Germany BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| | - Bernhard Schmidt
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Karina von der Malsburg
- Institute for Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, Freiburg, Germany
| | - Markus Deckers
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Bettina Warscheid
- Department of Biochemistry and Functional Proteomics, Faculty for Biology, University of Freiburg, Freiburg, Germany BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| | - Martin van der Laan
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany Institute for Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, Freiburg, Germany
| | - Peter Rehling
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
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18
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Nesci S, Ventrella V, Trombetti F, Pirini M, Pagliarani A. Thiol oxidation is crucial in the desensitization of the mitochondrial F1FO-ATPase to oligomycin and other macrolide antibiotics. Biochim Biophys Acta Gen Subj 2014; 1840:1882-91. [DOI: 10.1016/j.bbagen.2014.01.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 12/12/2013] [Accepted: 01/02/2014] [Indexed: 11/29/2022]
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19
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Nesci S, Ventrella V, Trombetti F, Pirini M, Pagliarani A. The mitochondrial F1FO-ATPase desensitization to oligomycin by tributyltin is due to thiol oxidation. Biochimie 2014; 97:128-37. [DOI: 10.1016/j.biochi.2013.10.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 10/03/2013] [Indexed: 11/15/2022]
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