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Petkowski JJ, Seager S, Bains W. Reasons why life on Earth rarely makes fluorine-containing compounds and their implications for the search for life beyond Earth. Sci Rep 2024; 14:15575. [PMID: 38971876 PMCID: PMC11227584 DOI: 10.1038/s41598-024-66265-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Accepted: 07/01/2024] [Indexed: 07/08/2024] Open
Abstract
Life on Earth is known to rarely make fluorinated carbon compounds, as compared to other halocarbons. We quantify this rarity, based on our exhaustive natural products database curated from available literature. We build on explanations for the scarcity of fluorine chemistry in life on Earth, namely that the exclusion of the C-F bond stems from the unique physico-chemical properties of fluorine, predominantly its extreme electronegativity and strong hydration shell. We further show that the C-F bond is very hard to synthesize and when it is made by life its potential biological functions can be readily provided by alternative functional groups that are much less costly to incorporate into existing biochemistry. As a result, the overall evolutionary cost-to-benefit balance of incorporation of the C-F bond into the chemical repertoire of life is not favorable. We argue that the limitations of organofluorine chemistry are likely universal in that they do not exclusively apply to specifics of Earth's biochemistry. C-F bonds, therefore, will be rare in life beyond Earth no matter its chemical makeup.
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Affiliation(s)
- Janusz J Petkowski
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
- Faculty of Environmental Engineering, Wroclaw University of Science and Technology, 50-370, Wroclaw, Poland.
- JJ Scientific, Warsaw, Mazowieckie, Poland.
| | - Sara Seager
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - William Bains
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- School of Physics & Astronomy, Cardiff University, 4 The Parade, Cardiff, CF24 3AA, UK
- Rufus Scientific, Melbourn, Royston, Herts, UK
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2
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Gallardo-Pérez JC, de Guevara AAL, García-Amezcua MA, Robledo-Cadena DX, Pacheco-Velázquez SC, Belmont-Díaz JA, Vargas-Navarro JL, Moreno-Sánchez R, Rodríguez-Enríquez S. Celecoxib and dimethylcelecoxib block oxidative phosphorylation, epithelial-mesenchymal transition and invasiveness in breast cancer stem cells. Curr Med Chem 2021; 29:2719-2735. [PMID: 34636290 DOI: 10.2174/0929867328666211005124015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 07/08/2021] [Accepted: 07/20/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Drug resistance and invasiveness developed by breast cancer stem cells (BCSC) are considered the major hurdles for successful cancer treatment. <P> Objective: As these two processes are highly energy-dependent, the identification of the main ATP supplier required for stem cell viability may result advantageous in the design of new therapeutic strategies to deter malignant carcinomas. <P> Methods: The energy metabolism (glycolysis and oxidative phosphorylation, OxPhos) was systematically analyzed by assessing relevant protein contents, enzyme activities and pathway fluxes in BCSC. Once identified the main ATP supplier, selective energy inhibitors and canonical breast cancer drugs were used to block stem cell viability and their metastatic properties. <P> Results: OxPhos and glycolytic protein contents, as well as HK and LDH activities were several times higher in BCSC than in their parental line, MCF-7 cells. However, CS, GDH, COX activities and both energy metabolism pathway fluxes were significantly lower (38-86%) in BCSC than in MCF-7 cells. OxPhos was the main ATP provider (>85%) in BCSC. Accordingly, oligomycin (a specific and potent canonical OxPhos inhibitor) and other non-canonical drugs with inhibitory effect on OxPhos (celecoxib, dimethylcelecoxib) significantly decreased BCSC viability, levels of epithelial-mesenchymal transition proteins, invasiveness, and induced ROS over-production, with IC50 values ranging from 1 to 20 µM in 24 h treatment. In contrast, glycolytic inhibitors (gossypol, iodoacetic acid, 3-bromopyruvate, 2-deoxyglucose) and canonical chemotherapeutic drugs (paclitaxel, doxorubicin, cisplatin) were much less effective against BCSC viability (IC50> 100 µM). <P> Conclusion: These results indicated that the use of some NSAIDs may be a promising alternative therapeutic strategy to target BCSC.
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Tasdogan A, McFadden DG, Mishra P. Mitochondrial DNA Haplotypes as Genetic Modifiers of Cancer. Trends Cancer 2020; 6:1044-1058. [PMID: 32980320 DOI: 10.1016/j.trecan.2020.08.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 08/05/2020] [Accepted: 08/18/2020] [Indexed: 02/06/2023]
Abstract
Mitochondria play an essential role in cellular metabolism, generation of reactive oxygen species (ROS), and the initiation of apoptosis. These properties enable mitochondria to be crucial integrators in the pathways of tumorigenesis. An open question is to what extent variation in the mitochondrial genome (mtDNA) contributes to the biological heterogeneity observed in human tumors. In this review, we summarize our current understanding of the role of mtDNA genetics in relation to human cancers.
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Affiliation(s)
- Alpaslan Tasdogan
- Children's Research Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - David G McFadden
- Department of Internal Medicine, Department of Biochemistry, Simmons Comprehensive Cancer Center, Division of Endocrinology, Program in Molecular Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Prashant Mishra
- Children's Research Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Department of Pediatrics, Green Center for Systems Biology, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA.
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4
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Jonnalagadda SK, Wielenberg K, Ronayne CT, Jonnalagadda S, Kiprof P, Jonnalagadda SC, Mereddy VR. Synthesis and biological evaluation of arylphosphonium-benzoxaborole conjugates as novel anticancer agents. Bioorg Med Chem Lett 2020; 30:127259. [DOI: 10.1016/j.bmcl.2020.127259] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 05/07/2020] [Accepted: 05/09/2020] [Indexed: 01/09/2023]
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5
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Yamada KJ, Heim CE, Xi X, Attri KS, Wang D, Zhang W, Singh PK, Bronich TK, Kielian T. Monocyte metabolic reprogramming promotes pro-inflammatory activity and Staphylococcus aureus biofilm clearance. PLoS Pathog 2020; 16:e1008354. [PMID: 32142554 PMCID: PMC7080272 DOI: 10.1371/journal.ppat.1008354] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 03/18/2020] [Accepted: 01/27/2020] [Indexed: 02/07/2023] Open
Abstract
Biofilm-associated prosthetic joint infections (PJIs) cause significant morbidity due to their recalcitrance to immune-mediated clearance and antibiotics, with Staphylococcus aureus (S. aureus) among the most prevalent pathogens. We previously demonstrated that S. aureus biofilm-associated monocytes are polarized to an anti-inflammatory phenotype and the adoptive transfer of pro-inflammatory macrophages attenuated biofilm burden, highlighting the critical role of monocyte/macrophage inflammatory status in dictating biofilm persistence. The inflammatory properties of leukocytes are linked to their metabolic state, and here we demonstrate that biofilm-associated monocytes exhibit a metabolic bias favoring oxidative phosphorylation (OxPhos) and less aerobic glycolysis to facilitate their anti-inflammatory activity and biofilm persistence. To shift monocyte metabolism in vivo and reprogram cells to a pro-inflammatory state, a nanoparticle approach was utilized to deliver the OxPhos inhibitor oligomycin to monocytes. Using a mouse model of S. aureus PJI, oligomycin nanoparticles were preferentially internalized by monocytes, which significantly reduced S. aureus biofilm burden by altering metabolism and promoting the pro-inflammatory properties of infiltrating monocytes as revealed by metabolomics and RT-qPCR, respectively. Injection of oligomycin alone had no effect on monocyte metabolism or biofilm burden, establishing that intracellular delivery of oligomycin is required to reprogram monocyte metabolic activity and that oligomycin lacks antibacterial activity against S. aureus biofilms. Remarkably, monocyte metabolic reprogramming with oligomycin nanoparticles was effective at clearing established biofilms in combination with systemic antibiotics. These findings suggest that metabolic reprogramming of biofilm-associated monocytes may represent a novel therapeutic approach for PJI.
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Affiliation(s)
- Kelsey J. Yamada
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Cortney E. Heim
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Xinyuan Xi
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Kuldeep S. Attri
- Eppley Institute, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Dezhen Wang
- Eppley Institute, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Wenting Zhang
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Pankaj K. Singh
- Eppley Institute, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Tatiana K. Bronich
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Tammy Kielian
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
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6
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Tan JL, Li F, Yeo JZ, Yong KJ, Bassal MA, Ng GH, Lee MY, Leong CY, Tan HK, Wu CS, Liu BH, Chan TH, Tan ZH, Chan YS, Wang S, Lim ZH, Toh TB, Hooi L, Low KN, Ma S, Kong NR, Stein AJ, Wu Y, Thangavelu MT, Suzuki A, Periyasamy G, Asara JM, Dan YY, Bonney GK, Chow EK, Lu GD, Ng HH, Kanagasundaram Y, Ng SB, Tam WL, Tenen DG, Chai L. New High-Throughput Screening Identifies Compounds That Reduce Viability Specifically in Liver Cancer Cells That Express High Levels of SALL4 by Inhibiting Oxidative Phosphorylation. Gastroenterology 2019; 157:1615-1629.e17. [PMID: 31446059 PMCID: PMC7309153 DOI: 10.1053/j.gastro.2019.08.022] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 07/18/2019] [Accepted: 08/09/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND & AIMS Some oncogenes encode transcription factors, but few drugs have been successfully developed to block their activity specifically in cancer cells. The transcription factor SALL4 is aberrantly expressed in solid tumor and leukemia cells. We developed a screen to identify compounds that reduce the viability of liver cancer cells that express high levels of SALL4, and we investigated their mechanisms. METHODS We developed a stringent high-throughput screening platform comprising unmodified SNU-387 and SNU-398 liver cancer cell lines and SNU-387 cell lines engineered to express low and high levels of SALL4. We screened 1597 pharmacologically active small molecules and 21,575 natural product extracts from plant, bacteria, and fungal sources for those that selectively reduce the viability of cells with high levels of SALL4 (SALL4hi cells). We compared gene expression patterns of SALL4hi cells vs SALL4-knockdown cells using RNA sequencing and real-time polymerase chain reaction analyses. Xenograft tumors were grown in NOD/SCID gamma mice from SALL4hi SNU-398 or HCC26.1 cells or from SALL4lo patient-derived xenograft (PDX) cells; mice were given injections of identified compounds or sorafenib, and the effects on tumor growth were measured. RESULTS Our screening identified 1 small molecule (PI-103) and 4 natural compound analogues (oligomycin, efrapeptin, antimycin, and leucinostatin) that selectively reduced viability of SALL4hi cells. We performed validation studies, and 4 of these compounds were found to inhibit oxidative phosphorylation. The adenosine triphosphate (ATP) synthase inhibitor oligomycin reduced the viability of SALL4hi hepatocellular carcinoma and non-small-cell lung cancer cell lines with minimal effects on SALL4lo cells. Oligomycin also reduced the growth of xenograft tumors grown from SALL4hi SNU-398 or HCC26.1 cells to a greater extent than sorafenib, but oligomycin had little effect on tumors grown from SALL4lo PDX cells. Oligomycin was not toxic to mice. Analyses of chromatin immunoprecipitation sequencing data showed that SALL4 binds approximately 50% of mitochondrial genes, including many oxidative phosphorylation genes, to activate their transcription. In comparing SALL4hi and SALL4-knockdown cells, we found SALL4 to increase oxidative phosphorylation, oxygen consumption rate, mitochondrial membrane potential, and use of oxidative phosphorylation-related metabolites to generate ATP. CONCLUSIONS In a screening for compounds that reduce the viability of cells that express high levels of the transcription factor SALL4, we identified inhibitors of oxidative phosphorylation, which slowed the growth of xenograft tumors from SALL4hi cells in mice. SALL4 activates the transcription of genes that regulate oxidative phosphorylation to increase oxygen consumption, mitochondrial membrane potential, and ATP generation in cancer cells. Inhibitors of oxidative phosphorylation might be used for the treatment of liver tumors with high levels of SALL4.
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Affiliation(s)
- Justin L Tan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Feng Li
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Joanna Z Yeo
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Kol Jia Yong
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Mahmoud A Bassal
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts
| | - Guo Hao Ng
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - May Yin Lee
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Chung Yan Leong
- Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Hong Kee Tan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Chan-Shuo Wu
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Bee Hui Liu
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Tim H Chan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Zi Hui Tan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Yun Shen Chan
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Siyu Wang
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Zhi Han Lim
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Tan Boon Toh
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Lissa Hooi
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Kia Ngee Low
- Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Siming Ma
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Nikki R Kong
- Department of Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Alicia J Stein
- Department of Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Yue Wu
- Department of Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts; Department of Clinical Laboratory, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Matan T Thangavelu
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Atsushi Suzuki
- Division of Organogenesis and Regeneration, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Giridharan Periyasamy
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | - John M Asara
- Department of Medicine, Division of Signal Transduction, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Yock Young Dan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Division of Gastroenterology and Hepatology, University Medicine Cluster, National University Health System, Singapore
| | - Glenn K Bonney
- Department of Hepatobiliary, Pancreatic Surgery and Liver Transplantation, Department of Surgery, University Surgical Cluster, National University Health System, Singapore; National University Centre for Organ Transplantation, National University Hospital, Singapore
| | - Edward K Chow
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Guo-Dong Lu
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Department of Toxicology, School of Public Health, Guangxi Medical University, Nanning, China; Key Laboratory of High-Incidence-Tumor Prevention and Treatment (Guangxi Medical University), Ministry of Education of China, Nanning, China
| | - Huck Hui Ng
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore
| | | | - Siew Bee Ng
- Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Wai Leong Tam
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; School of Biological Sciences, Nanyang Technological University, Singapore
| | - Daniel G Tenen
- Cancer Science Institute of Singapore, National University of Singapore, Singapore; Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts.
| | - Li Chai
- Department of Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts
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7
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Wang YT, Lim Y, McCall MN, Huang KT, Haynes CM, Nehrke K, Brookes PS. Cardioprotection by the mitochondrial unfolded protein response requires ATF5. Am J Physiol Heart Circ Physiol 2019; 317:H472-H478. [PMID: 31274354 PMCID: PMC6732477 DOI: 10.1152/ajpheart.00244.2019] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 05/21/2019] [Accepted: 06/09/2019] [Indexed: 11/22/2022]
Abstract
The mitochondrial unfolded protein response (UPRmt) is a cytoprotective signaling pathway triggered by mitochondrial dysfunction. UPRmt activation upregulates chaperones, proteases, antioxidants, and glycolysis at the gene level to restore proteostasis and cell energetics. Activating transcription factor 5 (ATF5) is a proposed mediator of the mammalian UPRmt. Herein, we hypothesized pharmacological UPRmt activation may protect against cardiac ischemia-reperfusion (I/R) injury in an ATF5-dependent manner. Accordingly, in vivo administration of the UPRmt inducers oligomycin or doxycycline 6 h before ex vivo I/R injury (perfused heart) was cardioprotective in wild-type but not global Atf5-/- mice. Acute ex vivo UPRmt activation was not cardioprotective, and loss of ATF5 did not impact baseline I/R injury without UPRmt induction. In vivo UPRmt induction significantly upregulated many known UPRmt-linked genes (cardiac quantitative PCR and Western blot analysis), and RNA-Seq revealed an UPRmt-induced ATF5-dependent gene set, which may contribute to cardioprotection. This is the first in vivo proof of a role for ATF5 in the mammalian UPRmt and the first demonstration that UPRmt is a cardioprotective drug target.NEW & NOTEWORTHY Cardioprotection can be induced by drugs that activate the mitochondrial unfolded protein response (UPRmt). UPRmt protection is dependent on activating transcription factor 5 (ATF5). This is the first in vivo evidence for a role of ATF5 in the mammalian UPRmt.
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MESH Headings
- Activating Transcription Factors/deficiency
- Activating Transcription Factors/genetics
- Activating Transcription Factors/metabolism
- Animals
- Disease Models, Animal
- Doxycycline/pharmacology
- Female
- Gene Expression Regulation
- Isolated Heart Preparation
- Male
- Mice, Inbred C57BL
- Mice, Knockout
- Mitochondria, Heart/drug effects
- Mitochondria, Heart/genetics
- Mitochondria, Heart/metabolism
- Mitochondria, Heart/pathology
- Myocardial Reperfusion Injury/genetics
- Myocardial Reperfusion Injury/metabolism
- Myocardial Reperfusion Injury/pathology
- Myocardial Reperfusion Injury/prevention & control
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/metabolism
- Myocytes, Cardiac/pathology
- Oligomycins/pharmacology
- Unfolded Protein Response/drug effects
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Affiliation(s)
- Yves T Wang
- Department of Anesthesiology, University of Rochester Medical Center, Rochester, New York
- Deaprtment of Medicine, University of Rochester Medical Center, Rochester, New York
| | - Yunki Lim
- Deaprtment of Medicine, University of Rochester Medical Center, Rochester, New York
| | - Matthew N McCall
- Department of Biostatistics and Computational Biology, University of Rochester Medical Center, Rochester, New York
| | - Kai-Ting Huang
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, New York
| | - Cole M Haynes
- Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, Worcester, Massachusetts
| | - Keith Nehrke
- Deaprtment of Medicine, University of Rochester Medical Center, Rochester, New York
| | - Paul S Brookes
- Department of Anesthesiology, University of Rochester Medical Center, Rochester, New York
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Vaamonde-García C, Loureiro J, Valcárcel-Ares MN, Riveiro-Naveira RR, Ramil-Gómez O, Hermida-Carballo L, Centeno A, Meijide-Failde R, Blanco FJ, López-Armada MJ. The mitochondrial inhibitor oligomycin induces an inflammatory response in the rat knee joint. BMC Musculoskelet Disord 2017; 18:254. [PMID: 28606072 PMCID: PMC5469149 DOI: 10.1186/s12891-017-1621-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 06/06/2017] [Indexed: 01/30/2023] Open
Abstract
Background Recent findings support a connection between mitochondrial dysfunction and activation of inflammatory pathways in articular cells. This study investigates in vivo in an acute model whether intra-articular administration of oligomycin, an inhibitor of mitochondrial function, induces an oxidative and inflammatory response in rat knee joints. Methods Oligomycin was injected into the rat left knee joint on days 0, 2, and 5 before joint tissues were obtained on day 6. The right knee joint served as control. Results were evaluated by macroscopy and histopathology and by measuring cellular and mitochondrial reactive oxygen species (ROS), 4-hydroxy-2-nonenal (4-HNE, a marker of lipid peroxidation), nuclear factor erythroid 2-related factor 2 (Nrf2), and CD68 (macrophages) and chemokine levels. The marker of mitochondrial mass COX-IV was also evaluated. Results The macroscopic findings showed significantly greater swelling in oligomycin-injected knees than in control knees. Likewise, the histological score of synovial damage was also increased significantly. Immunohistochemical studies showed high expression of IL-8, coinciding with a marked infiltration of polymorphonuclears and CD68+ cells in the synovium. Mitochondrial mass was increased in the synovium of oligomycin-injected joints, as well as cellular and mitochondrial ROS production, and 4-HNE. Relatedly, expression of the oxidative stress-related transcription factor Nrf2 was also increased. As expected, no histological differences were observed in the cartilage; however, cytokine-induced neutrophil chemoattractant-1 mRNA and protein expression were up-regulated in this tissue. Conclusions Mitochondrial failure in the joint is able to reproduce the oxidative and inflammatory status observed in arthritic joints. Electronic supplementary material The online version of this article (doi:10.1186/s12891-017-1621-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Carlos Vaamonde-García
- Aging and Inflammation Research Lab, Instituto de Investigación Biomédica de A Coruña (INIBIC), Complexo Hospitalario Universitario A Coruña (CHUAC), Sergas, Universidade da Coruña (UDC), As Xubias, 15006, A Coruña, Spain.,Tissue Engineering and Cellular Therapy Group, INIBIC, Department of Medicine, Faculty of Health Sciences- UDC, Campus Oza, A Coruña, Spain
| | - Jesús Loureiro
- Aging and Inflammation Research Lab, Instituto de Investigación Biomédica de A Coruña (INIBIC), Complexo Hospitalario Universitario A Coruña (CHUAC), Sergas, Universidade da Coruña (UDC), As Xubias, 15006, A Coruña, Spain
| | - Marta N Valcárcel-Ares
- Aging and Inflammation Research Lab, Instituto de Investigación Biomédica de A Coruña (INIBIC), Complexo Hospitalario Universitario A Coruña (CHUAC), Sergas, Universidade da Coruña (UDC), As Xubias, 15006, A Coruña, Spain
| | - Romina R Riveiro-Naveira
- Aging and Inflammation Research Lab, Instituto de Investigación Biomédica de A Coruña (INIBIC), Complexo Hospitalario Universitario A Coruña (CHUAC), Sergas, Universidade da Coruña (UDC), As Xubias, 15006, A Coruña, Spain
| | - Olalla Ramil-Gómez
- Aging and Inflammation Research Lab, Instituto de Investigación Biomédica de A Coruña (INIBIC), Complexo Hospitalario Universitario A Coruña (CHUAC), Sergas, Universidade da Coruña (UDC), As Xubias, 15006, A Coruña, Spain
| | - Laura Hermida-Carballo
- Aging and Inflammation Research Lab, Instituto de Investigación Biomédica de A Coruña (INIBIC), Complexo Hospitalario Universitario A Coruña (CHUAC), Sergas, Universidade da Coruña (UDC), As Xubias, 15006, A Coruña, Spain
| | | | - Rosa Meijide-Failde
- Tissue Engineering and Cellular Therapy Group, INIBIC, Department of Medicine, Faculty of Health Sciences- UDC, Campus Oza, A Coruña, Spain
| | - Francisco J Blanco
- Osteoarticular and Aging Research Lab, Rheumatology Service, INIBIC, CHUAC, Sergas, UDC, A Coruña, Spain
| | - María J López-Armada
- Aging and Inflammation Research Lab, Instituto de Investigación Biomédica de A Coruña (INIBIC), Complexo Hospitalario Universitario A Coruña (CHUAC), Sergas, Universidade da Coruña (UDC), As Xubias, 15006, A Coruña, Spain.
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9
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Vlodavsky E, Palzur E, Shehadeh M, Soustiel JF. Post-traumatic cytotoxic edema is directly related to mitochondrial function. J Cereb Blood Flow Metab 2017; 37:166-177. [PMID: 26672111 PMCID: PMC5363733 DOI: 10.1177/0271678x15621068] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 10/26/2015] [Accepted: 11/11/2015] [Indexed: 01/15/2023]
Abstract
Cerebral edema represents a major threat following traumatic brain injury. However, therapeutic measures for control of intracranial pressure alone have failed to restore cerebral metabolism and improve neurological outcome. Since mitochondrial damage results in ATP depletion and deactivation of membrane ionic pumps, we hypothesized that modulation of ATP bioavailability may directly affect cytotoxic edema. Intracranial pressure measurements were performed in Sprague-Dawley rats treated by intraperitoneal injection of dimethylsulfoxide (vehicle), cyclosporine A (CsA), or Oligomycin B (OligB) following cortical contusion and further correlated with water content, mitochondrial damage, and electron microscopic assessment of neuronal and axonal edema. As hypothesized, ultra-structural figures of edema closely correlated with intracranial pressure elevation, increased water content and mitochondrial membrane permeabilization expressed by loss of transmembrane mitochondrial potential. Further, mitochondrial damage evidenced ultra-structurally by figures of swollen mitochondria with severely distorted cristae correlated with both cytotoxic edema and mitochondrial dysfunction. Importantly, cerebral edema and mitochondrial impairment were significantly worsened by treatment with OligB, whereas a noticeable improvement could be observed in animals that received injections of CsA. Since OligB and CsA are responsible for symmetrical and opposite effects on oxidative metabolism, these findings support the hypothesis of a causative relationship between edema and mitochondrial function.
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Affiliation(s)
- Eugene Vlodavsky
- Institute of Pathology, Rambam Medical Center, Haifa, Israel.,The Ruth & Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Eilam Palzur
- Eliachar Research Laboratory, Galilee Medical Center, Faculty of Medicine in the Galilee, University of Bar Ilan, Naharia, Israel
| | - Mona Shehadeh
- The Ruth & Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Jean F Soustiel
- Eliachar Research Laboratory, Galilee Medical Center, Faculty of Medicine in the Galilee, University of Bar Ilan, Naharia, Israel .,Department of Neurosurgery, Galilee Medical Center, Faculty of Medicine in the Galilee, University of Bar Ilan, Naharia, Israel
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10
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Kuroki S, Kobayashi M, Tani H, Miyamoto R, Kurita S, Tamura K, Ono K, Washizu T, Bonkobara M. Selective growth inhibition by suppression of F1Fo ATPase in canine malignant melanoma cell lines. J Vet Pharmacol Ther 2016; 40:101-104. [PMID: 27292541 DOI: 10.1111/jvp.12336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 05/16/2016] [Indexed: 11/30/2022]
Abstract
Canine malignant melanoma (CMM) is a highly aggressive and fatal neoplasm. To identify potential therapeutic compounds and/or targets, 320 compounds were screened for their growth inhibitory activity in a CMM line (CMM-1) using a chemical library known to target specific signaling pathways/cell growth-related molecules. Among the compounds screened, the F1Fo ATPase inhibitor oligomycin showed potent growth inhibitory effects in CMM-1 cells, while exhibiting less toxic effects in a non-neoplastic control cell line (MDCK cells). The growth inhibitory effect of oligomycin A was then examined using six CMM lines and MDCK cells. Three CMM lines were highly sensitive to oligomycin A, with around 3000-20 000 times lower IC50 compared with oligomycin A-resistant CMM lines and MDCK cells. Oligomycin A-sensitive CMM-1 cells exhibited much greater oligomycin A-induced decreases in cellular ATP compared to oligomycin A-resistant cell lines. Although the oligomycins are clinically unsuitable because of its in vivo toxicity, these findings implicate the potential of F1Fo ATPase as a therapeutic target in a subset of CMM.
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Affiliation(s)
- S Kuroki
- Department of Veterinary Clinical Pathology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
| | - M Kobayashi
- Department of Veterinary Clinical Pathology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
| | - H Tani
- Department of Veterinary Clinical Pathology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
| | - R Miyamoto
- Department of Veterinary Clinical Pathology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
| | - S Kurita
- Department of Veterinary Clinical Pathology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
| | - K Tamura
- Department of Veterinary Clinical Pathology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
| | - K Ono
- Department of Veterinary Clinical Pathology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan.,Japan Animal Referral Medical Center, Takatsu-ku, Kawasaki-shi, Kanagawa, Japan
| | - T Washizu
- Department of Veterinary Clinical Pathology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
| | - M Bonkobara
- Department of Veterinary Clinical Pathology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
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11
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Cancer Stem Cells in Small Cell Lung Cancer Cell Line H446: Higher Dependency on Oxidative Phosphorylation and Mitochondrial Substrate-Level Phosphorylation than Non-Stem Cancer Cells. PLoS One 2016; 11:e0154576. [PMID: 27167619 PMCID: PMC4863974 DOI: 10.1371/journal.pone.0154576] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 04/15/2016] [Indexed: 02/07/2023] Open
Abstract
Recently, targeting cancer stem cells (CSCs) metabolism is becoming a promising therapeutic approach to improve cancer treatment outcomes. However, knowledge of the metabolic state of CSCs in small cell lung cancer is still lacking. In this study, we found that CSCs had significantly lower oxygen consumption rate and extracellular acidification rate than non-stem cancer cells. Meanwhile, this subpopulation of cells consumed less glucose, produced less lactate and maintained lower ATP levels. We also revealed that CSCs could produce more ATP through mitochondrial substrate-level phosphorylation during respiratory inhibition compared with non-stem cancer cells. Furthermore, they were more sensitive to suppression of oxidative phosphorylation. Therefore, oligomycin (inhibitor of oxidative phosphorylation) could severely impair sphere-forming and tumor-initiating abilities of CSCs. Our work suggests that CSCs represent metabolically inactive tumor subpopulations which sustain in a state showing low metabolic activity. However, mitochondrial substrate-level phosphorylation of CSCs may be more active than that of non-stem cancer cells. Moreover, CSCs showed preferential use of oxidative phosphorylation over glycolysis to meet their energy demand. These results extend our understanding of CSCs metabolism, potentially providing novel treatment strategies targeting metabolic pathways in small cell lung cancer.
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12
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Smalley JL, Breda C, Mason RP, Kooner G, Luthi-Carter R, Gant TW, Giorgini F. Connectivity mapping uncovers small molecules that modulate neurodegeneration in Huntington's disease models. J Mol Med (Berl) 2015; 94:235-45. [PMID: 26428929 PMCID: PMC4762922 DOI: 10.1007/s00109-015-1344-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 08/24/2015] [Accepted: 09/09/2015] [Indexed: 12/18/2022]
Abstract
UNLABELLED Huntington's disease (HD) is a genetic disease caused by a CAG trinucleotide repeat expansion encoding a polyglutamine tract in the huntingtin (HTT) protein, ultimately leading to neuronal loss and consequent cognitive decline and death. As no treatments for HD currently exist, several chemical screens have been performed using cell-based models of mutant HTT toxicity. These screens measured single disease-related endpoints, such as cell death, but had low 'hit rates' and limited dimensionality for therapeutic detection. Here, we have employed gene expression microarray analysis of HD samples--a snapshot of the expression of 25,000 genes--to define a gene expression signature for HD from publically available data. We used this information to mine a database for chemicals positively and negatively correlated to the HD gene expression signature using the Connectivity Map, a tool for comparing large sets of gene expression patterns. Chemicals with negatively correlated expression profiles were highly enriched for protective characteristics against mutant HTT fragment toxicity in in vitro and in vivo models. This study demonstrates the potential of using gene expression to mine chemical activity, guide chemical screening, and detect potential novel therapeutic compounds. KEY MESSAGES Single-endpoint chemical screens have low therapeutic discovery hit-rates. In the context of HD, we guided a chemical screen using gene expression data. The resulting chemicals were highly enriched for suppressors of mutant HTT fragment toxicity. This study provides a proof of concept for wider usage in all chemical screening.
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Affiliation(s)
- Joshua L Smalley
- Department of Genetics, University of Leicester, Leicester, LE1 7RH, UK.,MRC Toxicology Unit, University of Leicester, Leicester, LE1 7HB, UK
| | - Carlo Breda
- Department of Genetics, University of Leicester, Leicester, LE1 7RH, UK
| | - Robert P Mason
- Department of Genetics, University of Leicester, Leicester, LE1 7RH, UK
| | - Gurdeep Kooner
- Department of Genetics, University of Leicester, Leicester, LE1 7RH, UK
| | - Ruth Luthi-Carter
- Department of Cell Physiology and Pharmacology, University of Leicester, Leicester, LE1 7RH, UK
| | - Timothy W Gant
- MRC Toxicology Unit, University of Leicester, Leicester, LE1 7HB, UK.,Centre for Radiation, Chemical and Environmental Hazards, Public Health England, Harwell Campus, Oxfordshire, OX11 0RQ, UK
| | - Flaviano Giorgini
- Department of Genetics, University of Leicester, Leicester, LE1 7RH, UK.
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13
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Fu H, Xu H, Chen H, Li Y, Li W, Zhu Q, Zhang Q, Yuan H, Liu F, Wang Q, Miao M, Shi X. Inhibition of glycogen synthase kinase 3 ameliorates liver ischemia/reperfusion injury via an energy-dependent mitochondrial mechanism. J Hepatol 2014; 61:816-24. [PMID: 24862449 DOI: 10.1016/j.jhep.2014.05.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 04/09/2014] [Accepted: 05/03/2014] [Indexed: 12/29/2022]
Abstract
BACKGROUND & AIMS The mechanisms of glycogen synthase kinase-3 (GSK-3)-mediated cytoprotection during liver ischemia/reperfusion (I/R) remain controversial, particularly in older organs. This study explores the role and potential mechanisms of GSK-3 in young and aging livers. METHODS A rodent partial warm I/R model was used to evaluate the therapeutic potential of GSK-3 modulation during hepatic I/R in young and aging Sprague-Dawley rats. RESULTS GSK-3 inhibition through IPC or SB216763 (SB21) preconditioning protected young rats from I/R-induced liver injury. This protection was absent in old animals but could be restored by glucose infusion prior to the I/R insult. The protection conferred by GSK-3 inhibition depended on mitochondrial metabolism regulation. Indeed, the inhibition of GSK-3 suppressed mitochondrial permeability transition pore (MPTP) opening, triggering mitohormesis in young animals, whereas insufficient fuel suppressed mitochondrial metabolism and inactivated the GSK-3-related protection in old animals. SB21 and glucose reactivated the mitochondrial F0F1-ATPase and subsequent protective cascades in the senescent liver. These effects were antagonized by an ATPase inhibitor and by an MPTP opener. CONCLUSIONS The protection conferred by GSK-3 inhibition during hepatic I/R insult is energy dependent, particularly in senescent livers. These findings demonstrate a key role for GSK-3-related mitochondrial energy homeostasis, which may shed new light on the clinical use of GSK-3 inhibitors to protect liver function in surgical settings, particularly for older patients.
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Affiliation(s)
- Hailong Fu
- Department of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai 200433, China
| | - Haitao Xu
- Department of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai 200433, China
| | - Huan Chen
- Department of Biochemistry and Molecular Biology, Second Military Medical University, Shanghai 200433, China
| | - Yonghua Li
- Department of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai 200433, China
| | - Weiwei Li
- Department of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai 200433, China
| | - Qiufeng Zhu
- Department of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai 200433, China
| | - Qingqing Zhang
- Department of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai 200433, China
| | - Hongbin Yuan
- Department of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai 200433, China
| | - Fang Liu
- National Key Laboratory of Medical Immunology and Department of Immunology, Second Military Medical University, Shanghai 200433, China
| | - Quanxing Wang
- National Key Laboratory of Medical Immunology and Department of Immunology, Second Military Medical University, Shanghai 200433, China.
| | - Mingyong Miao
- Department of Biochemistry and Molecular Biology, Second Military Medical University, Shanghai 200433, China.
| | - Xueyin Shi
- Department of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai 200433, China.
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14
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Tanaka R, Takayama J, Takaoka M, Sugino Y, Ohkita M, Matsumura Y. Oligomycin, an F1Fo-ATPase inhibitor, protects against ischemic acute kidney injury in male but not in female rats. J Pharmacol Sci 2013; 123:227-34. [PMID: 24162022 DOI: 10.1254/jphs.13069fp] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
We investigated the effects of oligomycin, an F1Fo-ATPase inhibitor, on ischemic acute kidney injury in male and female rats. Ischemic acute kidney injury was induced by clamping the left renal artery and vein for 45 or 60 min followed by reperfusion, 2 weeks after contralateral nephrectomy. Renal dysfunction and histological renal damage were observed 1 day after reperfusion in both male and female rats, although these renal injuries were more marked in male rats than in female rats. Intravenous bolus injection of oligomycin (0.5 mg/kg) 5 min before ischemia markedly attenuated the ischemia/reperfusion-induced renal injury in male rats. However, oligomycin did not show the protective effect in female rats subjected to ischemia/reperfusion-induced renal injury. Pre-ischemic treatment with oligomycin suppressed partly but significantly ischemia-induced renal ATP depletion only in male rats. These results indicate that oligomycin prevents the onset of ischemic acute kidney injury in male but not in female rats, and the effect is accompanied by suppression of the ATP depletion only in the male rat kidney during ischemia, thereby suggesting that the ATP hydrolysis pathway by mitochondrial F1Fo-ATPase induces a sex difference in ischemic acute kidney injury.
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Affiliation(s)
- Ryosuke Tanaka
- Laboratory of Pathological and Molecular Pharmacology, Osaka University of Pharmaceutical Sciences, Japan
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15
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Mandujano-Tinoco EA, Gallardo-Pérez JC, Marín-Hernández A, Moreno-Sánchez R, Rodríguez-Enríquez S. Anti-mitochondrial therapy in human breast cancer multi-cellular spheroids. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2013. [DOI: 10.1016/j.bbamcr.2012.11.013] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Mahmmoud YA, Gaster M. Uncoupling of sarcoplasmic reticulum Ca²⁺-ATPase by N-arachidonoyl dopamine. Members of the endocannabinoid family as thermogenic drugs. Br J Pharmacol 2012; 166:2060-9. [PMID: 22335600 DOI: 10.1111/j.1476-5381.2012.01899.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND AND PURPOSE The sarcoplasmic reticulum Ca²⁺-ATPase (SERCA) plays a role in thermogenesis. The exogenous compound capsaicin increased SERCA-mediated ATP hydrolysis not coupled to Ca²⁺ transport. Here, we have sought to identify endogenous compounds that may function as SERCA uncoupling agents. EXPERIMENTAL APPROACH Using isolated SR vesicles from rabbits, we have screened for endogenous compounds that uncouple SERCA. We have also studied their ability to deplete cytoplasmic ATP from human skeletal muscle cells in culture. KEY RESULTS Studies on SR vesicles showed that the endogenous lipid metabolite N-arachidonoyl dopamine (NADA) was a potent stimulator of SERCA uncoupling. NADA stabilized an E₁-like pump conformation that had a lower dephosphorylation rate, low affinity for Ca²⁺ at the luminal sites and a specific proteinase K cleavage pattern involving protection of the C-terminal p83C fragment from further cleavage. Moreover, we found a significantly decreased cytoplasmic ATP levels following treatment of skeletal muscle cells with 100 nM NADA. This effect was dependent on the presence of glucose and abolished by pretreatment with the specific SERCA inhibitor thapsigargin, regardless of the presence of glucose. CONCLUSIONS AND IMPLICATIONS NADA is an endogenous molecule that may function as SERCA uncoupling agent in vivo. Members of the endocannabinoid family exert concerted actions on several Ca²⁺-handling proteins. Uncoupling of SERCA by exogenous compounds could be a novel post-mitochondrial strategy for reduction of cellular ATP levels. In addition, signalling networks leading to SERCA uncoupling can be explored to study the importance of this ion pump in pathophysiological conditions related to metabolism.
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Affiliation(s)
- Y A Mahmmoud
- Department of Biomedicine, University of Aarhus, Aarhus C, Denmark.
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Xiao WH, Bennett GJ. Effects of mitochondrial poisons on the neuropathic pain produced by the chemotherapeutic agents, paclitaxel and oxaliplatin. Pain 2012; 153:704-709. [PMID: 22244441 DOI: 10.1016/j.pain.2011.12.011] [Citation(s) in RCA: 134] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 11/16/2011] [Accepted: 12/10/2011] [Indexed: 11/29/2022]
Abstract
The dose-limiting side effect of taxane, platinum-complex, and other kinds of anticancer drugs is a chronic, distal, bilaterally symmetrical, sensory peripheral neuropathy that is often accompanied by neuropathic pain. Work with animal models of these conditions suggests that the neuropathy is a consequence of toxic effects on mitochondria in primary afferent sensory neurons. If this is true, then additional mitochondrial insult ought to make the neuropathic pain worse. This prediction was tested in rats with painful peripheral neuropathy due to the taxane agent, paclitaxel, and the platinum-complex agent, oxaliplatin. Rats with established neuropathy were given 1 of 3 mitochondrial poisons: rotenone (an inhibitor of respiratory Complex I), oligomycin (an inhibitor of adenosine triphosphate synthase), and auranofin (an inhibitor of the thioredoxin-thioredoxin reductase mitochondrial antioxidant defense system). All 3 toxins significantly increased the severity of paclitaxel-evoked and oxaliplatin-evoked mechano-allodynia and mechano-hyperalgesia while having no effect on the mechano-sensitivity of chemotherapy-naïve rats. Chemotherapy-evoked painful peripheral neuropathy is associated with an abnormal spontaneous discharge in primary afferent A fibers and C fibers. Oligomycin, at the same dose that exacerbated allodynia and hyperalgesia, significantly increased the discharge frequency of spontaneously discharging A fibers and C fibers in both paclitaxel-treated and oxaliplatin-treated rats, but did not evoke any discharge in naïve control rats. These results implicate mitochondrial dysfunction in the production of chemotherapy-evoked neuropathic pain and suggest that drugs that have positive effects on mitochondrial function may be of use in its treatment and prevention.
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Affiliation(s)
- Wen Hua Xiao
- Department of Anesthesia, McGill University, Montréal, Québec, Canada The Alan Edwards Centre for Research on Pain, McGill University, Montréal, Québec, Canada Faculty of Dentistry, McGill University, Montréal, Québec, Canada
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18
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High endoplasmic reticulum activity renders multiple myeloma cells hypersensitive to mitochondrial inhibitors. Cancer Chemother Pharmacol 2009; 66:129-40. [PMID: 19779717 DOI: 10.1007/s00280-009-1143-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2009] [Accepted: 09/12/2009] [Indexed: 10/20/2022]
Abstract
Multiple myeloma (MM) cells continuously secrete large amounts of immunoglobulins that are folded in the endoplasmic reticulum (ER) whose function depend on the Ca(2+) concentration inside its lumen. Recently, it was shown that the ER membrane leaks Ca(2+) that is captured and delivered back by mitochondria in order to prevent its loss. Thus, we hypothesized that the highly active and abundant ER in MM cells results in greater Ca(2+)-regulation by mitochondria which would render them sensitive to mitochondrial inhibitors. Here, we indeed find that Ca(2+) leak is greater in 3 MM, when compared to 2 B-cell leukemia cell lines. Moreover, this greater leak in MM cells is associated with hypersensitivity to various mitochondrial inhibitors, including CCCP. Consistent with our hypothesis, CCCP is more potent in inducing the unfolded protein response marker, CHOP/GADD153 in MM versus B-cell leukemia lines. Additionally, MM cells are found to be significantly more sensitive to clinically used fenofibrate and troglitazone, both of which were recently shown to have inhibitory effects on mitochondrial function. Overall, our results demonstrate that the unusually high ER activity in MM cells may be exploited for therapeutic benefit through the use of mitochondrial inhibitors including troglitazone and fenofibrate.
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Johnson KM, Cleary J, Fierke CA, Opipari AW, Glick GD. Mechanistic basis for therapeutic targeting of the mitochondrial F1F0-ATPase. ACS Chem Biol 2006; 1:304-8. [PMID: 17163759 DOI: 10.1021/cb600143j] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Altered cellular bioenergetics are implicated in many disease processes, and modulating the F 1 F o -ATPase, the enzyme responsible for producing the majority of ATP in eukaryotic cells, has been proposed to have therapeutic utility. Bz-423 is a 1,4-benzodiazepine that binds to the oligomycin sensitivity-conferring protein subunit of the mitochondrial F 1 F o -ATPase and inhibits the enzyme. In response to Bz-423, cells moderately decrease ATP synthesis and significantly increase superoxide, resulting in redox-regulated apoptosis. Administering Bz-423 to autoimmune mice leads to apoptosis of pathogenic cells and potent attenuation of disease progression. To determine if a mechanism of action distinguishes Bz-423 from toxic F 1 F o -ATPase inhibitors like oligomycin, we studied how both compounds inhibit the enzyme. Oligomycin is a high-affinity mixed inhibitor, displaying time-dependent inhibition, resulting in severe depletion of ATP. In contrast, Bz-423 is an allosteric inhibitor with lower affinity that rapidly dissociates from the enzyme. Our data support a model in which the interplay of these features underlies the favorable properties of Bz-423. They also represent key criteria for the development of therapeutic F 1 F o -ATPase inhibitors, which should have utility across a range of areas.
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Johnson KM, Chen X, Boitano A, Swenson L, Opipari AW, Glick GD. Identification and validation of the mitochondrial F1F0-ATPase as the molecular target of the immunomodulatory benzodiazepine Bz-423. ACTA ACUST UNITED AC 2005; 12:485-96. [PMID: 15850986 DOI: 10.1016/j.chembiol.2005.02.012] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2004] [Revised: 02/03/2005] [Accepted: 02/28/2005] [Indexed: 11/16/2022]
Abstract
Bz-423 is a 1,4-benzodiazepine that suppresses disease in lupus-prone mice by selectively killing pathogenic lymphocytes, and it is less toxic compared to current lupus drugs. Cells exposed to Bz-423 rapidly generate O(2)(-) within mitochondria, and this reactive oxygen species is the signal initiating apoptosis. Phage display screening revealed that Bz-423 binds to the oligomycin sensitivity conferring protein (OSCP) component of the mitochondrial F(1)F(0)-ATPase. Bz-423 inhibited the F(1)F(0)-ATPase in vitro, and reconstitution experiments demonstrated that inhibition was mediated by the OSCP. This target was further validated by generating cells with reduced OSCP expression using RNA interference and studying the sensitivity of these cells to Bz-423. Our findings help explain the efficacy and selectivity of Bz-423 for autoimmune lymphocytes and highlight the OSCP as a target to guide the development of novel lupus therapeutics.
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Affiliation(s)
- Kathryn M Johnson
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
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21
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Abstract
Mitochondria have long been recognized as the generators of energy for the cell. Like any other power source, however, mitochondria are highly vulnerable to inhibition or uncoupling of the energy harnessing process and run a high risk for catastrophic damage to the cell. The exquisite structural and functional characteristics of mitochondria provide a number of primary targets for xenobiotic-induced bioenergetic failure. They also provide opportunities for selective delivery of drugs to the mitochondrion. In light of the large number of natural, commercial, pharmaceutical, and environmental chemicals that manifest their toxicity by interfering with mitochondrial bioenergetics, it is important to understand the underlying mechanisms. The significance is further underscored by the recent identification of bioenergetic control points for cell replication and differentiation and the realization that mitochondria play a determinant role in cell signaling and apoptotic modes of cell death.
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Affiliation(s)
- K B Wallace
- Department of Biochemistry and Molecular Biology, University of Minnesota School of Medicine, Duluth 55812, USA.
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