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Gowans FA, Thach DQ, Zhu Z, Wang Y, Altamirano Poblano BE, Dovala D, Tallarico JA, McKenna JM, Schirle M, Maimone TJ, Nomura DK. Ophiobolin A Covalently Targets Mitochondrial Complex IV Leading to Metabolic Collapse in Cancer Cells. ACS Chem Biol 2024; 19:1260-1270. [PMID: 38739449 DOI: 10.1021/acschembio.4c00064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Ophiobolin A (OPA) is a sesterterpenoid fungal natural product with broad anticancer activity. While OPA possesses multiple electrophilic moieties that can covalently react with nucleophilic amino acids on proteins, the proteome-wide targets and mechanism of OPA remain poorly understood in many contexts. In this study, we used covalent chemoproteomic platforms to map the proteome-wide reactivity of the OPA in a highly sensitive lung cancer cell line. Among several proteins that OPA engaged, we focused on two targets: lysine-72 of cytochrome c oxidase subunit 5A (COX5A) and cysteine-53 of mitochondrial hypoxia induced gene 1 domain family member 2A (HIGD2A). These two subunit proteins are part of complex IV (cytochrome C oxidase) within the electron transport chain and contributed significantly to the antiproliferative activity of OPA. OPA activated mitochondrial respiration in a COX5A- and HIGD2A-dependent manner, leading to an initial spike in mitochondrial ATP and heightened mitochondrial oxidative stress. OPA compromised mitochondrial membrane potential, ultimately leading to ATP depletion. We have used chemoproteomic strategies to discover a unique anticancer mechanism of OPA through activation of complex IV leading to compromised mitochondrial energetics and rapid cell death.
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Affiliation(s)
- Flor A Gowans
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, California 94720, United States
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Innovative Genomics Institute, Berkeley, California 94704, United States
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720 United States
| | - Danny Q Thach
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
| | - Zhouyang Zhu
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
| | - Yangzhi Wang
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Innovative Genomics Institute, Berkeley, California 94704, United States
- Novartis Institutes for BioMedical Research, Basel CH-4056, Switzerland
| | - Belen E Altamirano Poblano
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Innovative Genomics Institute, Berkeley, California 94704, United States
- Novartis Institutes for BioMedical Research, Basel CH-4056, Switzerland
| | - Dustin Dovala
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Novartis Institutes for BioMedical Research, Emeryville, California 94608, United States
| | - John A Tallarico
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Jeffrey M McKenna
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Novartis Institutes for BioMedical Research, Basel CH-4056, Switzerland
| | - Markus Schirle
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Thomas J Maimone
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
| | - Daniel K Nomura
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, California 94720, United States
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Innovative Genomics Institute, Berkeley, California 94704, United States
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720 United States
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Evidente A. The incredible story of ophiobolin A and sphaeropsidin A: two fungal terpenes from wilt-inducing phytotoxins to promising anticancer compounds. Nat Prod Rep 2024; 41:434-468. [PMID: 38131643 DOI: 10.1039/d3np00035d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Covering: 2000 to 2023This review presents the exceptional story of ophiobolin A (OphA) and sphaeropsidin A (SphA), a sesterterpene and a diterpene, respectively, which were initially isolated as fungal phytotoxins and subsequently shown to possess other interesting biological activities, including promising anticancer activities. Ophiobolin A is a phytotoxin produced by different fungal pathogens, all belonging to the Bipolaris genus. Initially, it was only known as a very dangerous phytotoxin produced by fungi attacking essential cereals, such as rice and barley. However, extensive and interesting studies were carried out to define its original carbon skeleton, which is characterized by a typical 5 : 8 : 5 ring system and shared with fusicoccins and cotylenins, and its phytotoxic activity on host and non-host plants. The biosynthesis of OphA was also defined by describing the different steps starting from mevalonate and through the rearrangement of the acyclic C-25 precursor lead the toxin is obtained. OphA was also produced as a bioherbicide from Drechslera gigantea and proposed for the biocontrol of the widespread and dangerous weed Digitaria sanguinaria. To date, more than sixty ophiobolins have been isolated from different fungi and their biological activities and structure-activity relationship investigated, which were also described using their hemisynthetic derivatives. In the last two decades, thorough studies have been performed on the potential anticancer activity of OphA and its original mode of action, attracting great interest from scientists. Sphaeropsidin A has a similar story. It was isolated as the main phytotoxin from Diplodia cupressi, the causal agent of Italian cypress canker disease, resulting in the loss of millions of plants in a few years in the Mediterranean basin. The damage to the forest, environment and ornamental heritage are noteworthy and economic losses are also suffered by tree nurseries and the wood industry. Six natural analogues of SphA were isolated and several interesting hemisynthetic derivatives were prepared to study its structure-activity relationship. Surprisingly, sphaeropsidin A showed other interesting biological activities, including antibiotic, antifungal, and antiviral. In the last decade, extensive studies have focused on the anticancer activity and original mode of action of SphA. Furthermore, specific hemisynthetic studies enable the preparation of derivatives of SphA, preserving its chromophore, which showed a noteworthy increase in anticancer activity. It has been demonstrated that ophiobolin A and sphaeropsidin A are promising natural products showing potent activity against some malignant cancers, such as brain glioblastoma and different melanomas.
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Affiliation(s)
- Antonio Evidente
- Institute of Sciences of Food Production, National Research Council, Via Amendola 122/O, 70125 Bari, Italy.
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Gowans FA, Thach DQ, Wang Y, Altamirano Poblano BE, Dovala D, Tallarico JA, McKenna JM, Schirle M, Maimone TJ, Nomura DK. Ophiobolin A Covalently Targets Complex IV Leading to Mitochondrial Metabolic Collapse in Cancer Cells. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.09.531918. [PMID: 36945520 PMCID: PMC10029012 DOI: 10.1101/2023.03.09.531918] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Ophiobolin A (OPA) is a sesterterpenoid fungal natural product with broad anti-cancer activity. While OPA possesses multiple electrophilic moieties that can covalently react with nucleophilic amino acids on proteins, the proteome-wide targets and mechanism of OPA remain poorly understood in many contexts. In this study, we used covalent chemoproteomic platforms to map the proteome-wide reactivity of OPA in a highly sensitive lung cancer cell line. Among several proteins that OPA engaged, we focused on two targets-cysteine C53 of HIG2DA and lysine K72 of COX5A-that are part of complex IV of the electron transport chain and contributed significantly to the anti-proliferative activity. OPA activated mitochondrial respiration in a HIG2DA and COX5A-dependent manner, led to an initial spike in mitochondrial ATP, but then compromised mitochondrial membrane potential leading to ATP depletion. We have used chemoproteomic strategies to discover a unique anti-cancer mechanism of OPA through activation of complex IV leading to compromised mitochondrial energetics and rapid cell death.
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Affiliation(s)
- Flor A. Gowans
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, CA 94720 USA
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Innovative Genomics Institute, Berkeley, CA 94704 USA
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720 USA
| | - Danny Q. Thach
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
| | - Yangzhi Wang
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Innovative Genomics Institute, Berkeley, CA 94704 USA
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Belen E. Altamirano Poblano
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Innovative Genomics Institute, Berkeley, CA 94704 USA
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Dustin Dovala
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Novartis Institutes for BioMedical Research, Emeryville, CA 94608 USA
| | - John A. Tallarico
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Novartis Institutes for BioMedical Research, Cambridge, MA 02139 USA
| | - Jeffrey M. McKenna
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Markus Schirle
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Novartis Institutes for BioMedical Research, Cambridge, MA 02139 USA
| | - Thomas J. Maimone
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
| | - Daniel K. Nomura
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, CA 94720 USA
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Innovative Genomics Institute, Berkeley, CA 94704 USA
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720 USA
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Hu YJ, Li LX, Han JC, Min L, Li CC. Recent Advances in the Total Synthesis of Natural Products Containing Eight-Membered Carbocycles (2009-2019). Chem Rev 2020; 120:5910-5953. [PMID: 32343125 DOI: 10.1021/acs.chemrev.0c00045] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Natural products containing eight-membered carbocycles constitute a class of structurally intriguing and biologically important molecules such as the famous diterpenes taxol and vinigrol. Such natural products are being increasingly investigated because of their fascinating architectural features and potent medicinal properties. However, synthesis of natural products with cyclooctane moieties has proved to be highly challenging. This review highlights the recently completed total syntheses of natural products with eight-membered carbocycles with a focus on strategic considerations. A collection of 27 representative studies from the literature covering the decade from 2009 to 2019 is described in chronological order with relevant studies grouped together, including syntheses of the same natural product by different research groups using different strategies. Finally, a summary and outlook including a discussion of the major features of each strategy used in the syntheses are presented. This review illustrates the diversity and creativity in the elegant synthetic designs of eight-membered carbocycles. We hope this review will provide timely illumination and beneficial guidance for future synthetic efforts for organic chemists who are interested in this area.
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Affiliation(s)
- Ya-Jian Hu
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Li-Xuan Li
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Jing-Chun Han
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Long Min
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
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Screening Mold Colonies by Using Two Toxicity Assays Revealed Indoor Strains of Aspergillus calidoustus Producing Ophiobolins G and K. Toxins (Basel) 2019; 11:toxins11120683. [PMID: 31766362 PMCID: PMC6949950 DOI: 10.3390/toxins11120683] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 11/14/2019] [Accepted: 11/19/2019] [Indexed: 01/27/2023] Open
Abstract
The occurrence and toxin production of the opportunistic pathogen Aspergillus calidoustus in Finnish buildings is not well documented in the literature. We tracked and identified four A. calidoustus colonies cultivated from indoor settled dusts and revealed the biological activities of crude biomass extracts. The toxic substances were identified as 6-epi-ophiobolin K, ophiobolin K, and ophiobolin G by high-performance liquid chromatography–mass spectrometry (HPLC-MS) based on chromatographic and mass spectrometry data (MS and MS/MS) on the crude extract of A. calidoustus strain MH34. A total of 29 fungal colonies collected from settled dust in an office room reported for indoor-air-related illnesses were screened for toxins that inhibited boar sperm motility in the BSMI (boar sperm motility inhibiting) assay and cell proliferation in the ICP (inhibition of cell proliferation) assays with PK-15 cells. Out of the 27 colonies tested as toxic, 12 colonies exhibiting conidiophores representative of the genera Chaetomium, Penicillium, and Paecilomyces were excluded from the study, while 13 colonies exhibited Aspergillus-like conidiophores. Biomass suspensions of these colonies were divided into two categories: Category 1 colonies (n = 4), toxic in the BSMI assay and the ICP assays, emitted blue fluorescence and grew at 37 °C; Category 2 colonies (n = 9), only toxic in the ICP assay, emitted orange fluorescence and exhibited limited or no growth at 37 °C. Colonies in Category 1 were pure-cultured, and the strains were named as MH4, MH21, MH34, MH36. Strain MH34 was identified as A. calidoustus by the internal transcribed spacer (ITS) sequences. Ethanol-soluble dry substances extracted from the biomass of the pure cultures exhibited a toxicological profile in the BSMI assay, SMID (sperm membrane integrity damage) assay, and ICP assay similar to that exhibited by pure ophiobolin A. Overall, the viable conidia of A. calidoustus in indoor settled dusts deserve attention when potentially hazardous mold species are monitored.
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Maehara S, Yamane C, Kitamura C, Hinokuma M, Hata T. High ophiobolin A production in endophytic fungus Bipolaris sp. associated with Datura metel. Nat Prod Res 2019; 34:2990-2992. [PMID: 30990079 DOI: 10.1080/14786419.2019.1597352] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Ophiobolin A, a metabolite of fungi, is known to induce cell death and have anticancer activity. Therefore, obtaining ophiobolin A has become an important aspect in studying activity with medicinal properties that are affected by it. Ophiobolin A-producing filamentous fungi are endophytic or infectious microbes that attack annual and short-cycle plants. Here we isolated the endophyte of Datura metel, which is an annual plant that produces ophiobolin A. Results of this study have led to the identification of an endophytic filamentous fungus Bipolaris sp. with high ophiobolin A production (235 mg/L) in liquid culture after 21 days. Our findings further indicate that ophiobolin A-producing fungi live in short-cycle plants, and a method of finding the fungus is described.
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Affiliation(s)
- Shoji Maehara
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Fukuyama, Hiroshima, Japan
| | - Chihiro Yamane
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Fukuyama, Hiroshima, Japan
| | - Chinami Kitamura
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Fukuyama, Hiroshima, Japan
| | - Minako Hinokuma
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Fukuyama, Hiroshima, Japan
| | - Toshiyuki Hata
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Fukuyama, Hiroshima, Japan
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Masi M, Dasari R, Evidente A, Mathieu V, Kornienko A. Chemistry and biology of ophiobolin A and its congeners. Bioorg Med Chem Lett 2019; 29:859-869. [DOI: 10.1016/j.bmcl.2019.02.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 02/03/2019] [Accepted: 02/06/2019] [Indexed: 11/16/2022]
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Tian W, Deng Z, Hong K. The Biological Activities of Sesterterpenoid-Type Ophiobolins. Mar Drugs 2017; 15:md15070229. [PMID: 28718836 PMCID: PMC5532671 DOI: 10.3390/md15070229] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 07/10/2017] [Accepted: 07/13/2017] [Indexed: 12/11/2022] Open
Abstract
Ophiobolins (Ophs) are a group of tricarbocyclic sesterterpenoids whose structures contain a tricyclic 5-8-5 carbotricyclic skeleton. Thus far, 49 natural Ophs have been reported and assigned into A-W subgroups in order of discovery. While these sesterterpenoids were first characterized as highly effective phytotoxins, later investigations demonstrated that they display a broad spectrum of biological and pharmacological characteristics such as phytotoxic, antimicrobial, nematocidal, cytotoxic, anti-influenza and inflammation-promoting activities. These bioactive molecules are promising drug candidates due to the developments of their anti-proliferative activities against a vast number of cancer cell lines, multidrug resistance (MDR) cells and cancer stem cells (CSCs). Despite numerous studies on the biological functions of Ophs, their pharmacological mechanism still requires further research. This review summarizes the chemical structures, sources, and biological activities of the oph family and discusses its mechanisms and structure-activity relationship to lay the foundation for the future developments and applications of these promising molecules.
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Affiliation(s)
- Wei Tian
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, and Wuhan University School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China.
| | - Zixin Deng
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, and Wuhan University School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China.
| | - Kui Hong
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, and Wuhan University School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China.
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Morrison R, Lodge T, Evidente A, Kiss R, Townley H. Ophiobolin A, a sesterpenoid fungal phytotoxin, displays different mechanisms of cell death in mammalian cells depending upon the cancer cell origin. Int J Oncol 2017; 50:773-786. [PMID: 28112374 PMCID: PMC5358713 DOI: 10.3892/ijo.2017.3858] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 12/15/2016] [Indexed: 12/20/2022] Open
Abstract
Herein we have undertaken a systematic analysis of the effects of the fungal derivative ophiobolin A (OphA) on eight cancer cell lines from different tissue types. The LD50 for each cell line was determined and the change in cell size determined. Flow cytometric analysis and western blotting were used to assess the cell death markers for early apoptosis, late apoptosis and necrosis, and the involvement of the caspase signalling pathway. Alterations in calcium levels and reactive oxygen species were assessed due to their integral involvement in intracellular signalling. Subsequently, the endoplasmic reticulum (ER) and mitochondrial responses were investigated more closely. The extent of ER swelling, and the upregulation of proteins involved in the unfolded protein responses (UPR) were seen to vary according to cell line. The mitochondria were also shown to behave differently in response to the OphA in the different cell lines in terms of the change in membrane potential, the total area of mitochondria in the cell and the number of mitochondrial bifurcations. The data obtained in the present study indicate that the cancer cell lines tested are unable to successfully activate the ER stress/UPR responses, and that the mitochondria appear to be a central player in OphA-induced cancer cell death.
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Affiliation(s)
- Rachel Morrison
- Department of Engineering Science, University of Oxford, Oxford, UK
| | - Tiffany Lodge
- Department of Obstetrics and Gynaecology, University of Oxford, John Radcliffe Hospital, Oxford, UK
| | - Antonio Evidente
- Dipartimento di Scienze Chimiche, Universita di Napoli Federico II Complesso Universitario Monte Sant'Angelo, Naples, Italy
| | - Robert Kiss
- Laboratoire de Cancérologie et de Toxicologie Experimentale, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Helen Townley
- Department of Engineering Science, University of Oxford, Oxford, UK
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Ophiobolin A Induces Autophagy and Activates the Mitochondrial Pathway of Apoptosis in Human Melanoma Cells. PLoS One 2016; 11:e0167672. [PMID: 27936075 PMCID: PMC5147944 DOI: 10.1371/journal.pone.0167672] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 11/20/2016] [Indexed: 12/31/2022] Open
Abstract
Ophiobolin A, a fungal toxin from Bipolaris species known to affect different cellular processes in plants, has recently been shown to have anti-cancer activity in mammalian cells. In the present study, we investigated the anti-proliferative effect of Ophiobolin A on human melanoma A375 and CHL-1 cell lines. This cellular model was chosen because of the incidence of melanoma malignant tumor on human population and its resistance to chemical treatments. Ophyobolin A strongly reduced cell viability of melanoma cells by affecting mitochondrial functionality. The toxin induced depolarization of mitochondrial membrane potential, reactive oxygen species production and mitochondrial network fragmentation, leading to autophagy induction and ultimately resulting in cell death by activation of the mitochondrial pathway of apoptosis. Finally, a comparative proteomic investigation on A375 cells allowed to identify several Ophiobolin A down-regulated proteins, which are involved in fundamental processes for cell homeostasis and viability.
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Fanelli F, Reveglia P, Masi M, Mulè G, Zonno MC, Cimmino A, Vurro M, Evidente A. Influence of light on the biosynthesis of ophiobolin A by Bipolaris maydis. Nat Prod Res 2016; 31:909-917. [PMID: 27820961 DOI: 10.1080/14786419.2016.1253084] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Ophiobolin A (O-A) is a sesterpenoid with numerous biological activities, including potential anticancer effects. Its production at an industrial level is hampered due to inability of fungus Bipolaris maydis to biosynthesise it in vitro in large amount. Among the environmental factors regulating fungal metabolism, light plays a crucial role. In this study, the use of different light wavelength (light emitting diodes (LEDs)) was evaluated to increase the O-A production. The white light allowed the highest production of the metabolite. The blue and green lights showed an inhibitory effect, reducing the production to 50%, as well as red and yellow but at a lower level. No correlation between fungal growth and metabolite production was found in relation to the light type. A novel application of LED technologies, which can be optimised to foster specific pathways and promote the production of metabolites having scientific and industrial interest was proposed.
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Affiliation(s)
- Francesca Fanelli
- a Institute of Sciences of Food Production , National Research Council , Bari , Italy
| | - Pierluigi Reveglia
- b Department of Chemical Sciences , University of Naples "Federico II", Complesso Universitario Monte S. Angelo , Napoli , Italy
| | - Marco Masi
- b Department of Chemical Sciences , University of Naples "Federico II", Complesso Universitario Monte S. Angelo , Napoli , Italy
| | - Giuseppina Mulè
- a Institute of Sciences of Food Production , National Research Council , Bari , Italy
| | - Maria Chiara Zonno
- a Institute of Sciences of Food Production , National Research Council , Bari , Italy
| | - Alessio Cimmino
- b Department of Chemical Sciences , University of Naples "Federico II", Complesso Universitario Monte S. Angelo , Napoli , Italy
| | - Maurizio Vurro
- a Institute of Sciences of Food Production , National Research Council , Bari , Italy
| | - Antonio Evidente
- b Department of Chemical Sciences , University of Naples "Federico II", Complesso Universitario Monte S. Angelo , Napoli , Italy
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Pósa A, Szabó R, Szalai Z, Kupai K, Deim Z, Murlasits Z, Bencsik O, Szekeres A, Vágvölgyi C, Balogh L, Juhász B, Szilvássy Z, Varga C. The effect of acute ophiobolin A treatment on HO-mediated inflammatory processes. Hum Exp Toxicol 2016; 36:594-602. [PMID: 27402683 DOI: 10.1177/0960327116658107] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Many microbial and plant-derived metabolites contribute to the production of inflammatory mediators and the expression of pro-inflammatory molecules. Ophiobolin A (OPA) is a fungal secondary metabolite produced by Bipolaris species. The aim of our study was to examine the acute effects of this compound on inflammatory processes. Male Wistar rats were treated with 5% ethanol, 0.01 mg/kg OPA, 0.1 mg/kg OPA and 1.0 mg/kg OPA per os. After 24 h of the administrations, inflammatory mediators such as interleukin-6 (IL-6), tumour necrosis factor-alpha (TNF-α) and myeloperoxidase (MPO) enzyme as well as heme oxygenase (HO) activity were measured in both plasma and cardiac tissue, along with serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST). We found that OPA caused a significant elevation in the concentrations of IL-6 and TNF-α, increased MPO activity and decreased HO enzyme activity in the plasma. While OPA induces inflammation in the plasma, it did not change the level of inflammatory mediators in the cardiac tissue and the concentrations of serum ALT and AST. Our findings indicate that rapid release of inflammatory mediators by OPA promotes systemic inflammation. However, this acute OPA treatment does not show toxic effects on the cardiac tissue and the concentrations of liver enzymes.
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Affiliation(s)
- Anikó Pósa
- 1 Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Renáta Szabó
- 1 Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Zita Szalai
- 1 Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Krisztina Kupai
- 1 Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Zoltán Deim
- 1 Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | | | - Ottó Bencsik
- 3 Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - András Szekeres
- 3 Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Csaba Vágvölgyi
- 3 Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - László Balogh
- 4 Institute of Physical Education and Sport Science, Juhász Gyula Faculty of Education, University of Szeged, Szeged, Hungary
| | - Béla Juhász
- 5 Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Zoltán Szilvássy
- 5 Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Csaba Varga
- 1 Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
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Bhatia DR, Dhar P, Mutalik V, Deshmukh SK, Verekar SA, Desai DC, Kshirsagar R, Thiagarajan P, Agarwal V. Anticancer activity of Ophiobolin A, isolated from the endophytic fungus Bipolaris setariae. Nat Prod Res 2015. [PMID: 26212208 DOI: 10.1080/14786419.2015.1062760] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The present work describes the anticancer activity of Ophiobolin A isolated from the endophytic fungus Bipolaris setariae. Ophiobolin A was isolated using preparative HPLC and its structure was confirmed by HRMS, (1)H NMR, (13)C NMR, COSY, DEPT, HSQC and HMBC. It inhibited solid and haematological cancer cell proliferation with IC50 of 0.4-4.3 μM. In comparison, IC50 against normal cells was 20.9 μM. It was found to inhibit the phosphorylation of S6 (IC50 = 1.9 ± 0.2 μM), ERK (IC50 = 0.28 ± 0.02 μM) and RB (IC50 = 1.42 ± 0.1 μM), the effector proteins of PI3K/mTOR, Ras/Raf/ERK and CDK/RB pathways, respectively. It induced apoptosis and inhibited cell cycle progression in MDA-MB-231 cancer cells with concomitant inhibition of signalling proteins. Thus, this study reveals that anticancer activity of Ophiobolin A is associated with simultaneous inhibition of multiple oncogenic signalling pathways namely PI3K/mTOR, Ras/Raf/ERK and CDK/RB.
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Affiliation(s)
- Dimple R Bhatia
- a Department of Pharmacology , Piramal Enterprises Limited , Mumbai , Maharashtra , India
| | - Payal Dhar
- a Department of Pharmacology , Piramal Enterprises Limited , Mumbai , Maharashtra , India
| | - Varun Mutalik
- b Department of Natural Products , Piramal Enterprises Limited , Mumbai , Maharashtra , India
| | - Sunil Kumar Deshmukh
- b Department of Natural Products , Piramal Enterprises Limited , Mumbai , Maharashtra , India
| | - Shilpa A Verekar
- b Department of Natural Products , Piramal Enterprises Limited , Mumbai , Maharashtra , India
| | - Dattatraya C Desai
- c Department of Chemistry , Piramal Enterprises Limited , Mumbai , Maharashtra , India
| | - Rajendra Kshirsagar
- c Department of Chemistry , Piramal Enterprises Limited , Mumbai , Maharashtra , India
| | - Padma Thiagarajan
- d School of Biosciences and Technology , VIT University , Vellore , Tamil Nadu , India
| | - Veena Agarwal
- a Department of Pharmacology , Piramal Enterprises Limited , Mumbai , Maharashtra , India
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14
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Bencsik O, Papp T, Berta M, Zana A, Forgó P, Dombi G, Andersson MA, Salkinoja-Salonen M, Vágvölgyi C, Szekeres A. Ophiobolin A from Bipolaris oryzae perturbs motility and membrane integrities of porcine sperm and induces cell death on mammalian somatic cell lines. Toxins (Basel) 2014; 6:2857-71. [PMID: 25251540 PMCID: PMC4179164 DOI: 10.3390/toxins6092857] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 08/28/2014] [Accepted: 09/01/2014] [Indexed: 12/21/2022] Open
Abstract
Bipolaris oryzae is a phytopathogenic fungus causing a brown spot disease in rice, and produces substance that strongly perturbs motility and membrane integrities of boar spermatozoa. The substance was isolated from the liquid culture of the fungal strain using extraction and a multi-step semi-preparative HPLC procedures. Based on the results of mass spectrometric and 2D NMR techniques, the bioactive molecule was identified as ophiobolin A, a previously described sesterterpene-type compound. The purified ophiobolin A exhibited strong motility inhibition and viability reduction on boar spermatozoa. Furthermore, it damaged the sperm mitochondria significantly at sublethal concentration by the dissipation of transmembrane potential in the mitochondrial inner membrane, while the plasma membrane permeability barrier remained intact. The study demonstrated that the cytotoxicity of ophiobolin A toward somatic cell lines is higher by 1–2 orders of magnitude compared to other mitochondriotoxic mycotoxins, and towards sperm cells unique by replacing the progressive motility by shivering tail beating at low exposure concentration.
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Affiliation(s)
- Ottó Bencsik
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged H-6726, Hungary.
| | - Tamás Papp
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged H-6726, Hungary.
| | - Máté Berta
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged H-6726, Hungary.
| | - Annamária Zana
- Institute of Pharmaceutical Analysis, University of Szeged, Somogyi u. 4, Szeged H-6720, Hungary.
| | - Péter Forgó
- Institute of Pharmaceutical Analysis, University of Szeged, Somogyi u. 4, Szeged H-6720, Hungary.
| | - György Dombi
- Institute of Pharmaceutical Analysis, University of Szeged, Somogyi u. 4, Szeged H-6720, Hungary.
| | - Maria A Andersson
- Department of Food and Environmental Sciences, Viikinkaari 9, University of Helsinki, Agnes Sjöbergin katu 2, Helsinki FI-00014, Finland.
| | - Mirja Salkinoja-Salonen
- Department of Food and Environmental Sciences, Viikinkaari 9, University of Helsinki, Agnes Sjöbergin katu 2, Helsinki FI-00014, Finland.
| | - Csaba Vágvölgyi
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged H-6726, Hungary.
| | - András Szekeres
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged H-6726, Hungary.
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15
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Bladt TT, Dürr C, Knudsen PB, Kildgaard S, Frisvad JC, Gotfredsen CH, Seiffert M, Larsen TO. Bio-activity and dereplication-based discovery of ophiobolins and other fungal secondary metabolites targeting leukemia cells. Molecules 2013; 18:14629-50. [PMID: 24287995 PMCID: PMC6290568 DOI: 10.3390/molecules181214629] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Revised: 11/15/2013] [Accepted: 11/21/2013] [Indexed: 12/27/2022] Open
Abstract
The purpose of this study was to identify and characterize fungal natural products (NPs) with in vitro bioactivity towards leukemia cells. We based our screening on a combined analytical and bio-guided approach of LC-DAD-HRMS dereplication, explorative solid-phase extraction (E-SPE), and a co-culture platform of CLL and stromal cells. A total of 289 fungal extracts were screened and we tracked the activity to single compounds in seven of the most active extracts. The novel ophiobolin U was isolated together with the known ophiobolins C, H, K as well as 6-epiophiobolins G, K and N from three fungal strains in the Aspergillus section Usti. Ophiobolins A, B, C and K displayed bioactivity towards leukemia cells with induction of apoptosis at nanomolar concentrations. The remaining ophiobolins were mainly inactive or only slightly active at micromolar concentrations. Dereplication of those ophiobolin derivatives possessing different activity in combination with structural analysis allowed a correlation of the chemical structure and conformation with the extent of bioactivity, identifying the hydroxy group at C3 and an aldehyde at C21, as well as the A/B-cis ring structure, as indispensible for the strong activity of the ophiobolins. The known compounds penicillic acid, viridicatumtoxin, calbistrin A, brefeldin A, emestrin A, and neosolaniol monoacetate were identified from the extracts and also found generally cytotoxic.
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Affiliation(s)
- Tanja Thorskov Bladt
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
| | - Claudia Dürr
- German Cancer Research Center, Molecular Genetics, Im Neuenheimer Feld 280, Heidelberg D-69120, Germany; E-Mail:
| | - Peter Boldsen Knudsen
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
| | - Sara Kildgaard
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
| | - Jens Christian Frisvad
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
| | - Charlotte Held Gotfredsen
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 201, Kgs. Lyngby DK-2800, Denmark; E-Mail:
| | - Martina Seiffert
- German Cancer Research Center, Molecular Genetics, Im Neuenheimer Feld 280, Heidelberg D-69120, Germany; E-Mail:
- Authors to whom correspondence should be addressed; E-Mails: (M.S.); (T.O.L.); Tel.: +49-6221-42-4586 (M.S.); Fax: +49-6221-42-2995 (M.S.); Tel.: +45-4525-2632 (T.O.L.); Fax: +45-4588-4148 (T.O.L.)
| | - Thomas Ostenfeld Larsen
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
- Authors to whom correspondence should be addressed; E-Mails: (M.S.); (T.O.L.); Tel.: +49-6221-42-4586 (M.S.); Fax: +49-6221-42-2995 (M.S.); Tel.: +45-4525-2632 (T.O.L.); Fax: +45-4588-4148 (T.O.L.)
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16
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Bury M, Novo-Uzal E, Andolfi A, Cimini S, Wauthoz N, Heffeter P, Lallemand B, Avolio F, Delporte C, Cimmino A, Dubois J, Van Antwerpen P, Zonno MC, Vurro M, Poumay Y, Berger W, Evidente A, De Gara L, Kiss R, Locato V. Ophiobolin A, a sesterterpenoid fungal phytotoxin, displays higher in vitro growth-inhibitory effects in mammalian than in plant cells and displays in vivo antitumor activity. Int J Oncol 2013; 43:575-85. [PMID: 23754298 DOI: 10.3892/ijo.2013.1979] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Accepted: 03/21/2013] [Indexed: 11/06/2022] Open
Abstract
Ophiobolin A, a sesterterpenoid produced by plant pathogenic fungi, was purified from the culture extract of Drechslera gigantea and tested for its growth-inhibitory activity in both plant and mammalian cells. Ophiobolin A induced cell death in Nicotiana tabacum L. cv. Bright Yellow 2 (TBY-2) cells at concentrations ≥10 µM, with the TBY-2 cells showing typical features of apoptosis-like cell death. At a concentration of 5 µM, ophiobolin A did not affect plant cell viability but prevented cell proliferation. When tested on eight cancer cell lines, concentrations <1 µM of ophiobolin A inhibited growth by 50% after 3 days of culture irrespective of their multidrug resistance (MDR) phenotypes and their resistance levels to pro-apoptotic stimuli. It is, thus, unlikely that ophiobolin A exerts these in vitro growth-inhibitory effects in cancer cells by activating pro-apoptotic processes. Highly proliferative human keratinocytes appeared more sensitive to the growth-inhibitory effects of ophiobolin A than slowly proliferating ones. Ophiobolin A also displayed significant antitumor activity at the level of mouse survival when assayed at 10 mg/kg in the B16F10 mouse melanoma model with lung pseudometastases. Ophiobolin A could, thus, represent a novel scaffold to combat cancer types that display various levels of resistance to pro-apoptotic stimuli and/or various MDR phenotypes.
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Affiliation(s)
- Marina Bury
- Laboratoire de Toxicologie, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
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17
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Bury M, Girault A, Mégalizzi V, Spiegl-Kreinecker S, Mathieu V, Berger W, Evidente A, Kornienko A, Gailly P, Vandier C, Kiss R. Ophiobolin A induces paraptosis-like cell death in human glioblastoma cells by decreasing BKCa channel activity. Cell Death Dis 2013; 4:e561. [PMID: 23538442 PMCID: PMC3615734 DOI: 10.1038/cddis.2013.85] [Citation(s) in RCA: 128] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 02/19/2013] [Accepted: 02/25/2013] [Indexed: 01/31/2023]
Abstract
Glioblastoma multiforme (GBM) is the most lethal and common malignant human brain tumor. The intrinsic resistance of highly invasive GBM cells to radiation- and chemotherapy-induced apoptosis accounts for the generally dismal treatment outcomes. This study investigated ophiobolin A (OP-A), a fungal metabolite from Bipolaris species, for its promising anticancer activity against human GBM cells exhibiting varying degrees of resistance to proapoptotic stimuli. We found that OP-A induced marked changes in the dynamic organization of the F-actin cytoskeleton, and inhibited the proliferation and migration of GBM cells, likely by inhibiting big conductance Ca(2+)-activated K(+) channel (BKCa) channel activity. Moreover, our results indicated that OP-A induced paraptosis-like cell death in GBM cells, which correlated with the vacuolization, possibly brought about by the swelling and fusion of mitochondria and/or the endoplasmic reticulum (ER). In addition, the OP-A-induced cell death did not involve the activation of caspases. We also showed that the expression of BKCa channels colocalized with these two organelles (mitochondria and ER) was affected in this programmed cell death pathway. Thus, this study reveals a novel mechanism of action associated with the anticancer effects of OP-A, which involves the induction of paraptosis through the disruption of internal potassium ion homeostasis. Our findings offer a promising therapeutic strategy to overcome the intrinsic resistance of GBM cells to proapoptotic stimuli.
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Affiliation(s)
- M Bury
- Laboratoire de Toxicologie, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - A Girault
- INSERM U1069, Laboratoire Nutrition Croissance Cancer, Université de Tours, Tours, France
| | - V Mégalizzi
- Laboratoire de Toxicologie, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - S Spiegl-Kreinecker
- Department of Neurosurgery, Landesnervenklinik Wagner-Jauregg Hospital, Linz, Austria
| | - V Mathieu
- Laboratoire de Toxicologie, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - W Berger
- Department of Medicine I, Comprehensive Cancer Center and Institute of Cancer Research, Medical University Vienna, Vienna, Austria
| | - A Evidente
- Dipartimento di Scienze Chimiche, Complesso Universitario Monte Sant'Angelo, Napoli, Italy
| | - A Kornienko
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX, USA
| | - P Gailly
- Laboratoire de Physiologie Cellulaire, Institut des Neurosciences, Université Catholique de Louvain, Brussels, Belgium
| | - C Vandier
- INSERM U1069, Laboratoire Nutrition Croissance Cancer, Université de Tours, Tours, France
| | - R Kiss
- Laboratoire de Toxicologie, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
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18
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Tsuna K, Noguchi N, Nakada M. Enantioselective Total Synthesis of (+)-Ophiobolin A. Chemistry 2013; 19:5476-86. [DOI: 10.1002/chem.201204119] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 01/16/2013] [Indexed: 11/05/2022]
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19
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Shafawati MS, Inagaki F, Kawamura T, Mukai C. Syntheses of 6-8-5 tricyclic ring systems by carbonylative [2+2+1] cycloaddition of bis(allene)s. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.12.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Li K, Wang C, Yin G, Gao S. Construction of the basic skeleton of ophiobolin A and variecolin. Org Biomol Chem 2013; 11:7550-8. [DOI: 10.1039/c3ob41693c] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Jianping Z, Guifang D, Kai Z, Yongjun Z, Yongliang L, Liuqing Y. Screening and identification of insertion mutants from Bipolaris eleusines by mutagenesis based on restriction enzyme-mediated integration. FEMS Microbiol Lett 2012; 330:90-7. [PMID: 22432435 DOI: 10.1111/j.1574-6968.2012.02537.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Ophiobolin A is sesterterpenoid-type phytotoxin and may be an important candidate for development of new crop protection and pharmaceutical products. The restriction enzyme-mediated integration (REMI) method was used to introduce the plasmid pSH75 into the ophiobolin A-producing filamentous fungus Bipolaris eleusines. A total of 323 stable transformants were obtained, all of which were capable of growing on potato-dextrose agar medium containing 200 μg mL(-1) hygromycin B. The transformation frequency was about 4-5 transformants μg(-1) plasmid DNA. An ophibolin A-deficient transformant (B014) was assessed and the presence of the hph gene in this transformant was confirmed by PCR. The cell-free cultural filtrates of this transformant showed significantly less inhibition on mycelial growth of the fungal pathogen Rhizoctoni solani but little effect on barnyard grass as opposed to that of the wild-type B. eleusines. There was no detectable amount of ophiobolin A in B014 samples measured with HPLC. This research suggests REMI as a potential approach for improving the production of ophiobolin A by B. eleusines via genetic engineering to upregulate certain genes responsible for desired biosynthetic pathways.
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Affiliation(s)
- Zhang Jianping
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
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22
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Tsuna K, Noguchi N, Nakada M. Convergent total synthesis of (+)-ophiobolin A. Angew Chem Int Ed Engl 2011; 50:9452-5. [PMID: 21915975 DOI: 10.1002/anie.201104447] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Indexed: 11/10/2022]
Affiliation(s)
- Kazuhiro Tsuna
- Department of Chemistry and Biochemistry, Faculty of Science and Engineering, Waseda University, Tokyo 169-8555, Japan
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24
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Krizsán K, Bencsik O, Nyilasi I, Galgóczy L, Vágvölgyi C, Papp T. Effect of the sesterterpene-type metabolites, ophiobolins A and B, on zygomycetes fungi. FEMS Microbiol Lett 2010; 313:135-40. [PMID: 21054501 DOI: 10.1111/j.1574-6968.2010.02138.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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25
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Phuwapraisirisan P, Sawang K, Siripong P, Tip-pyang S. Anhydrocochlioquinone A, a new antitumor compound from Bipolaris oryzae. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.05.151] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Noguchi N, Nakada M. Synthetic studies on (+)-ophiobolin A: asymmetric synthesis of the spirocyclic CD-ring moiety. Org Lett 2007; 8:2039-42. [PMID: 16671776 DOI: 10.1021/ol060437x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction; see text] Asymmetric synthesis of the spirocyclic CD-ring moiety of (+)-ophiobolin A is described. Fragment A, which was prepared via pig liver esterase (PLE)-mediated kinetic resolution, and fragment B, which was prepared via diastereoselective allylation and subsequent kinetic iodolactonization, were coupled to afford the allylsilane 2, which was successfully cyclized to the desired spirocyclic CD-ring moiety 1a in the presence of a Lewis acid.
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Affiliation(s)
- Naoyoshi Noguchi
- Department of Chemistry, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan
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27
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Sato A, Fujiwara H, Oku H, Ishiguro K, Ohizumi Y. Alpha-mangostin induces Ca2+-ATPase-dependent apoptosis via mitochondrial pathway in PC12 cells. J Pharmacol Sci 2005; 95:33-40. [PMID: 15153648 DOI: 10.1254/jphs.95.33] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
We investigated the cell death effects of eight xanthones on PC12 rat pheochromocytoma cells. Among these compounds, alpha-mangostin, from the fruit hull of Garcinia mangostana L., had the most potent effect with the EC(50) value of 4 microM. Alpha-mangostin-treated PC12 cells demonstrated typical apoptotic DNA fragmentation and caspase-3 cleavage (equivalent to activation). The flow cytometric analysis indicated that this compound induced apoptosis in time-and concentration-dependent manners. Alpha-mangostin showed the features of the mitochondrial apoptotic pathway such as mitochondrial membrane depolarization and cytochrome c release. Furthermore, alpha-mangostin inhibited the sarco(endo)plasmic reticulum Ca(2+)-ATPase markedly. There was a correlation between the Ca(2+)-ATPase inhibitory effects and the apoptotic effects of the xanthone derivatives. On the other hand, c-Jun NH(2)-terminal kinase (JNK/SAPK), one of the signaling molecules of endoplasmic reticulum (ER) stress, was activated with alpha-mangostin treatment. These results suggest that alpha-mangostin inhibits Ca(2+)-ATPase to cause apoptosis through the mitochondrial pathway.
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Affiliation(s)
- Ayumi Sato
- Department of Pharmaceutical Molecular Biology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
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28
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Cytotoxic sesterterpenes, 6-epi-ophiobolin G and 6-epi-ophiobolin N, from marine derived fungus Emericella variecolor GF10. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.05.021] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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29
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Fujiwara H, Saito SY, Hitotsuyanagi Y, Takeya K, Ohizumi Y. RA-VII, a cyclic depsipeptide, changes the conformational structure of actin to cause G2 arrest by the inhibition of cytokinesis. Cancer Lett 2004; 209:223-9. [PMID: 15159025 DOI: 10.1016/j.canlet.2003.12.022] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2003] [Revised: 11/27/2003] [Accepted: 12/26/2003] [Indexed: 10/26/2022]
Abstract
In L1210 cells, RA-VII (0.1-100 nM) caused the concentration-dependent inhibition of the proliferation and G2 arrest. Treatment of PC12 cells with 10 nM RA-VII changed cell shape round with binucleation, suggesting the inhibition of cytokinesis. The fluorescence intensity of FITC-phalloidin bound to F-actin was enhanced by RA-VII. In surface plasmon resonance experiments, the signal of F-actin was modified by RA-VII in close agreement with a concentration of FITC-phalloidin binding to F-actin. These results suggest that RA-VII causes the conformational change of F-actin and the stabilization of actin filaments to induce G2 arrest.
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Affiliation(s)
- Hironori Fujiwara
- Department of Pharmaceutical Molecular Biology, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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30
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Fujiwara H, Yamakuni T, Ueno M, Ishizuka M, Shinkawa T, Isobe T, Ohizumi Y. IC101 induces apoptosis by Akt dephosphorylation via an inhibition of heat shock protein 90-ATP binding activity accompanied by preventing the interaction with Akt in L1210 cells. J Pharmacol Exp Ther 2004; 310:1288-95. [PMID: 15161934 DOI: 10.1124/jpet.104.065979] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
To find novel pharmacological tools useful for analyzing the molecular mechanism of apoptosis from natural resources, in the present study, we examined the activity of IC101, a cyclic depsipeptide isolated from Streptomyces sp. MJ202-72F3, to induce apoptosis in the L1210 cell line. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay showed that IC101 caused a concentration-dependent cell death with a 50% effective concentration value of 20 nM. Cell shrinkage, chromatin condensation, a typical DNA ladder pattern, and up-regulation of cleaved caspase-3 expression, which were biochemical characteristics of apoptosis, were induced by IC101. It also was observed that IC101 caused a concentration-dependent dephosphorylation of Akt and Bad without affecting phosphatidylinositol-3 kinase, an upstream molecule of Akt. IC101 dephosphorylated the 90-kDa protein, as assayed by immunblotting of the cell extract by using anti-phosphotyrosine antibody. To identify the 90-kDa protein, immunoprecipitation and direct nano-flow liquid chromatography-tandem mass spectrometry (LC-MS) were performed to demonstrate that this protein was heat shock protein 90 (HSP90). Consistently, it was observed that IC101 induced the HSP90 tyrosine dephosphorylation by immunoblot analysis of immunoprecipitates with anti-HSP90 antibody using anti-phosphotyrosine antibody. IC101 caused the degradation of Raf-1, which formed a complex with HSP90. The HSP90-ATP binding also was inhibited by IC101 in a noncompetitive manner. An interaction of HSP90 with Akt was shown to be inhibited by IC101 in a concentration-dependent manner. These results suggest that IC101 dephosphorylates Akt through an inhibition of HSP90 functions, resulting in the interaction with Akt to induce apoptotic cell death of L1210 cells.
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Affiliation(s)
- Hironori Fujiwara
- Department of Pharmaceutical Molecular Biology, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Candra E, Matsunaga K, Fujiwara H, Mimaki Y, Kuroda M, Sashida Y, Ohizumi Y. Potent apoptotic effects of saponins from Liliaceae plants in L1210 cells. J Pharm Pharmacol 2002; 54:257-62. [PMID: 11848289 DOI: 10.1211/0022357021778286] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
We isolated eight saponins, a hexacyclic lanosterol tetraglycoside (1), a 27-norlanosterol tetraglycoside (2) and six spirostanol oligoglycosides (3-8), from the plants of the family Liliaceae. In murine leukaemic L1210 cells, saponins 5 and 7 at a concentration of 1 microM showed potent cytotoxic activity and the activities were in the following decreasing order: 5, 7, 1, 3, 2, 8, 4, 6. At a concentration of 10 microM, not only 5 and 7 but also 3 and 8 markedly caused cell death. The flow cytometric analysis indicated that 7 and 8 caused a concentration- and time-dependent apoptosis of L1210 cells (EC50 value = approximately 5 microM). The morphological observation using a light microscope revealed that both 7 and 8 induced shrinkage in cell soma and chromatin condensation, suggesting apoptotic cell death. Moreover, in agarose gel electrophoretic analysis, a typical apoptotic DNA ladder pattern was observed after treatment with both 7 and 8. These results suggest that 7 and 8 caused the death of L1210 cells through the apoptotic process. These compounds may become powerful pharmacological tools for studying the molecular mechanism of apoptosis.
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Affiliation(s)
- E Candra
- Department of Pharmaceutical Molecular Biology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
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Candra E, Matsunaga K, Fujiwara H, Mimaki Y, Sashida Y, Yamakuni T, Ohizumi Y. Two steroidal saponins from Camassia cusickii induce L1210 cell death through the apoptotic mechanism. Can J Physiol Pharmacol 2001. [DOI: 10.1139/y01-068] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two steroidal saponins, tigogenin hexasaccharide-1 (TGHS-1, (25R)-5α-spirostan-3β-yl 4-O-[2-O-[3-O- (α-L-rhamnopyranosyl)-β-D-glucopyranosyl]-3-O-[4-O-(α-L-rhamnopyranosyl)-β-D-glucopyranosyl]-β-D-glucopyranosyl]- β-D-galactopyranoside) and tigogenin hexasaccharide-2 (TGHS-2, (25R)-5α-spirostan-3β-yl 4-O-[2-O-[3-O- (β-D-glucopyranosyl)-β-D-glucopyranosyl]-3-O-[4-O-(α-L-rhamnopyranosyl)-β-D-glucopyranosyl]-β-D-glucopyranosyl]- β-D-galactopyranoside), were isolated from the fresh bulbs of Camassia cusickii. In murine leukemic L1210 cells, both compounds showed cytotoxicity with an EC50 value of 0.06 µM. The morphological observation revealed that TGHS-1 and TGHS-2 induced shrinkage in cell soma and chromatin condensation, suggesting apoptotic cell death. The cell death was confirmed to be apoptosis by Annexin V binding to phosphatidylserine in the cell membrane and excluding propidium iodide. A typical apoptotic DNA ladder and the cleavage of caspase-3 were observed after treatment with TGHS-1 and TGHS-2. In the presence of both the compounds, cells with sub-G1 DNA content were detected by flow cytometric analysis, indicating that TGHS-1 and TGHS-2 (each EC50 value of 0.1 µM) are the most powerful apoptotic saponins known. These results suggest that TGHS-1 and TGHS-2 induce apoptotic cell death through caspase-3 activation.Key words: steroidal saponin, tigogenin hexasaccharide, apoptosis, DNA fragmentation, murine leukemic L1210 cells.
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