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Artemisinin inhibits neutrophil and macrophage chemotaxis, cytokine production and NET release. Sci Rep 2022; 12:11078. [PMID: 35773325 PMCID: PMC9245885 DOI: 10.1038/s41598-022-15214-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 06/21/2022] [Indexed: 12/26/2022] Open
Abstract
Immune cell chemotaxis to the sites of pathogen invasion is critical for fighting infection, but in life-threatening conditions such as sepsis and Covid-19, excess activation of the innate immune system is thought to cause a damaging invasion of immune cells into tissues and a consequent excessive release of cytokines, chemokines and neutrophil extracellular traps (NETs). In these circumstances, tempering excessive activation of the innate immune system may, paradoxically, promote recovery. Here we identify the antimalarial compound artemisinin as a potent and selective inhibitor of neutrophil and macrophage chemotaxis induced by a range of chemotactic agents. Artemisinin released calcium from intracellular stores in a similar way to thapsigargin, a known inhibitor of the Sarco/Endoplasmic Reticulum Calcium ATPase pump (SERCA), but unlike thapsigargin, artemisinin blocks only the SERCA3 isoform. Inhibition of SERCA3 by artemisinin was irreversible and was inhibited by iron chelation, suggesting iron-catalysed alkylation of a specific cysteine residue in SERCA3 as the mechanism by which artemisinin inhibits neutrophil motility. In murine infection models, artemisinin potently suppressed neutrophil invasion into both peritoneum and lung in vivo and inhibited the release of cytokines/chemokines and NETs. This work suggests that artemisinin may have value as a therapy in conditions such as sepsis and Covid-19 in which over-activation of the innate immune system causes tissue injury that can lead to death.
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Synergistic antitumor effect of a penicillin derivative combined with thapsigargin in melanoma cells. J Cancer Res Clin Oncol 2022; 148:3361-3373. [PMID: 35751681 DOI: 10.1007/s00432-022-04129-4] [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: 03/08/2022] [Accepted: 06/08/2022] [Indexed: 10/17/2022]
Abstract
PURPOSE To investigate the effect of TAP7f, a penicillin derivative previously characterized as a potent antitumor agent that promotes ER stress and apoptosis, in combination with thapsigargin, an ER stress inducer, on melanoma cells. METHODS The synergistic antiproliferative effect of TAP7f in combination with thapsigargin was studied in vitro in murine B16-F0 melanoma cells, and in human A375 and SB2 melanoma cells. In vivo assays were performed with C57BL/6J mice challenged with B16-F0 cells. Immunofluorescence and Western blot assays were carried out to characterize the induction of ER stress and apoptosis. Necrotic tumor areas and the potential toxicity of the combined therapy were examined by histological analysis of tissue sections after hematoxylin-eosin staining. RESULTS In vitro, the combination of TAP7f with thapsigargin synergistically inhibited the proliferation of murine B16-F0, and human A375 and SB2 melanoma cells. When non-inhibitory doses of each drug were simultaneously administered to C57BL/6J mice challenged with B16-F0 cells, a 50% reduction in tumor volumes was obtained in the combined group. An apoptotic response characterized by higher expression levels of Baxenhanced PARP-1 cleavage and the presence of active caspase 3 was observed in tumors from the combined treatment. In addition, higher expression levels of GADD153/CHOP and ATF4 were found in tumors of mice treated with both drugs with respect to each drug used alone, indicating the induction of an ER stress response. No signs of tissue toxicity were observed in histological sections of different organs extracted from mice receiving the combination. CONCLUSION The synergistic and effective antitumor action of TAP7f in combination with thapsigargin could be considered as a potential therapeutic strategy for melanoma treatment.
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Mazumder K, Aktar A, Roy P, Biswas B, Hossain ME, Sarkar KK, Bachar SC, Ahmed F, Monjur-Al-Hossain ASM, Fukase K. A Review on Mechanistic Insight of Plant Derived Anticancer Bioactive Phytocompounds and Their Structure Activity Relationship. Molecules 2022; 27:molecules27093036. [PMID: 35566385 PMCID: PMC9102595 DOI: 10.3390/molecules27093036] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 05/04/2022] [Accepted: 05/05/2022] [Indexed: 11/16/2022] Open
Abstract
Cancer is a disorder that rigorously affects the human population worldwide. There is a steady demand for new remedies to both treat and prevent this life-threatening sickness due to toxicities, drug resistance and therapeutic failures in current conventional therapies. Researchers around the world are drawing their attention towards compounds of natural origin. For decades, human beings have been using the flora of the world as a source of cancer chemotherapeutic agents. Currently, clinically approved anticancer compounds are vincristine, vinblastine, taxanes, and podophyllotoxin, all of which come from natural sources. With the triumph of these compounds that have been developed into staple drug products for most cancer therapies, new technologies are now appearing to search for novel biomolecules with anticancer activities. Ellipticine, camptothecin, combretastatin, curcumin, homoharringtonine and others are plant derived bioactive phytocompounds with potential anticancer properties. Researchers have improved the field further through the use of advanced analytical chemistry and computational tools of analysis. The investigation of new strategies for administration such as nanotechnology may enable the development of the phytocompounds as drug products. These technologies have enhanced the anticancer potential of plant-derived drugs with the aim of site-directed drug delivery, enhanced bioavailability, and reduced toxicity. This review discusses mechanistic insights into anticancer compounds of natural origins and their structural activity relationships that make them targets for anticancer treatments.
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Affiliation(s)
- Kishor Mazumder
- Department of Pharmacy, Jashore University of Science and Technology, Jashore 7408, Bangladesh; (A.A.); (P.R.); (B.B.); (M.E.H.); (K.K.S.)
- School of Optometry and Vision Science, UNSW Medicine, University of New South Wales (UNSW), Sydney, NSW 2052, Australia
- Correspondence: or (K.M.); (K.F.)
| | - Asma Aktar
- Department of Pharmacy, Jashore University of Science and Technology, Jashore 7408, Bangladesh; (A.A.); (P.R.); (B.B.); (M.E.H.); (K.K.S.)
| | - Priyanka Roy
- Department of Pharmacy, Jashore University of Science and Technology, Jashore 7408, Bangladesh; (A.A.); (P.R.); (B.B.); (M.E.H.); (K.K.S.)
| | - Biswajit Biswas
- Department of Pharmacy, Jashore University of Science and Technology, Jashore 7408, Bangladesh; (A.A.); (P.R.); (B.B.); (M.E.H.); (K.K.S.)
| | - Md. Emran Hossain
- Department of Pharmacy, Jashore University of Science and Technology, Jashore 7408, Bangladesh; (A.A.); (P.R.); (B.B.); (M.E.H.); (K.K.S.)
| | - Kishore Kumar Sarkar
- Department of Pharmacy, Jashore University of Science and Technology, Jashore 7408, Bangladesh; (A.A.); (P.R.); (B.B.); (M.E.H.); (K.K.S.)
| | - Sitesh Chandra Bachar
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka 1207, Bangladesh; (S.C.B.); (F.A.)
| | - Firoj Ahmed
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka 1207, Bangladesh; (S.C.B.); (F.A.)
| | - A. S. M. Monjur-Al-Hossain
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Dhaka, Dhaka 1207, Bangladesh;
| | - Koichi Fukase
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
- Correspondence: or (K.M.); (K.F.)
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ALILOU H, AKSSIRA M. Chemical composition, antibacterial, antioxidant and insecticidal activities of moroccan Thapsia transtagana essential oil. Saudi J Biol Sci 2021; 28:6756-6764. [PMID: 34866974 PMCID: PMC8626207 DOI: 10.1016/j.sjbs.2021.07.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 07/12/2021] [Accepted: 07/16/2021] [Indexed: 11/26/2022] Open
Abstract
INTRODUCTION The use of chemical products to neutralize microorganisms has always been a subject of discussion and research for alternative solutions, indeed, the use of essential oils has been a promising natural methodology. METHODS In our study we used the essential oils from different parts of Thapsia transtagana (Apiaceae), obtained by hydrodistillation, were identified and using Gas chromatography-mass spectrometry (GC-MS) and Gas Chromatography-Flame Ionization Detection (GC/FID) methods and evaluated against several bacteria of Gram- and Gram + bacteria. Disk diffusion, Minimum Inhibitory Concentration (MIC) and Minimum Microbicidal Concentration (MMC) methods have been used. Free radical-scavenging activity and insecticidal activity of Thapsia transtagana essential oils were also identified. RESULTS Majority products from different parts of Thapsia transtagana essential oil identified by GC-MS and GC/FID methods are 2,6-Dimethylnaphthalene, Pinane and Hexahydrofarnesyl acetone. The highest activity was found against Staphylococcus aureus using inflorescence essential oil with minimal inhibitory concentration value for 0,56 μg/μL. Insecticidal activity was also the subject of this study, roots and inflorescence essential oils demonstrated to have a remarkable potent against Acanthoscelides obtectus and Sitophilus oryzae using contact assessment, inhalation assessment and ingestion assessment tests. Insecticidal activity assay results showed a significant enhancement of mortality in both test insect pest on increasing the dose and exposure period. In the other hand, the different essential oils of Thapsia transtagana were evaluated for their radical scavenging activities by means of the 2,2-diphenyl-1-picryl-hydrazyl (DPPH) assay. The strongest scavenging activity was observed in inflorescences essential oil fraction scavenged radicals effectively at 100% using 500 mgL-1 concentration. CONCLUSION Its essential oils were proved to have strong antimicrobial, insecticidal and antioxidant activities that allows it to be used by the pharmaceutical and cosmetic industries as natural preservative.
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Affiliation(s)
- Hakim ALILOU
- Sultan Moulay Slimane University of Beni Mellal, Research Group in Environmental Sciences and Applied Materials (SEMA), FP Khouribga, B.P. 145, 25000 Khouribga, Morocco
| | - Mohamed AKSSIRA
- Laboratory of Bio-organic and Analytic Chemistry, Faculty of Science and Technology, Hassan II University, BP: 146, Mohammadia 20650, Morocco
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Heit S, Geurts MMG, Murphy BJ, Corey RA, Mills DJ, Kühlbrandt W, Bublitz M. Structure of the hexameric fungal plasma membrane proton pump in its autoinhibited state. SCIENCE ADVANCES 2021; 7:eabj5255. [PMID: 34757782 DOI: 10.1101/2021.04.30.442159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The fungal plasma membrane H+-ATPase Pma1 is a vital enzyme, generating a proton-motive force that drives the import of essential nutrients. Autoinhibited Pma1 hexamers in the plasma membrane of starving fungi are activated by glucose signaling and subsequent phosphorylation of the autoinhibitory domain. As related P-type adenosine triphosphatases (ATPases) are not known to oligomerize, the physiological relevance of Pma1 hexamers remained unknown. We have determined the structure of hexameric Pma1 from Neurospora crassa by electron cryo-microscopy at 3.3-Å resolution, elucidating the molecular basis for hexamer formation and autoinhibition and providing a basis for structure-based drug development. Coarse-grained molecular dynamics simulations in a lipid bilayer suggest lipid-mediated contacts between monomers and a substantial protein-induced membrane deformation that could act as a proton-attracting funnel.
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Affiliation(s)
- Sabine Heit
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Maxwell M G Geurts
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Bonnie J Murphy
- Max Planck Institute of Biophysics, Max-von-Laue-Str.3, 60438 Frankfurt am Main, Germany
| | - Robin A Corey
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Deryck J Mills
- Max Planck Institute of Biophysics, Max-von-Laue-Str.3, 60438 Frankfurt am Main, Germany
| | - Werner Kühlbrandt
- Max Planck Institute of Biophysics, Max-von-Laue-Str.3, 60438 Frankfurt am Main, Germany
| | - Maike Bublitz
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
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Heit S, Geurts MMG, Murphy BJ, Corey RA, Mills DJ, Kühlbrandt W, Bublitz M. Structure of the hexameric fungal plasma membrane proton pump in its autoinhibited state. SCIENCE ADVANCES 2021; 7:eabj5255. [PMID: 34757782 PMCID: PMC8580308 DOI: 10.1126/sciadv.abj5255] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 09/22/2021] [Indexed: 05/11/2023]
Abstract
The fungal plasma membrane H+-ATPase Pma1 is a vital enzyme, generating a proton-motive force that drives the import of essential nutrients. Autoinhibited Pma1 hexamers in the plasma membrane of starving fungi are activated by glucose signaling and subsequent phosphorylation of the autoinhibitory domain. As related P-type adenosine triphosphatases (ATPases) are not known to oligomerize, the physiological relevance of Pma1 hexamers remained unknown. We have determined the structure of hexameric Pma1 from Neurospora crassa by electron cryo-microscopy at 3.3-Å resolution, elucidating the molecular basis for hexamer formation and autoinhibition and providing a basis for structure-based drug development. Coarse-grained molecular dynamics simulations in a lipid bilayer suggest lipid-mediated contacts between monomers and a substantial protein-induced membrane deformation that could act as a proton-attracting funnel.
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Affiliation(s)
- Sabine Heit
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Maxwell M. G. Geurts
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Bonnie J. Murphy
- Max Planck Institute of Biophysics, Max-von-Laue-Str.3, 60438 Frankfurt am Main, Germany
| | - Robin A. Corey
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Deryck J. Mills
- Max Planck Institute of Biophysics, Max-von-Laue-Str.3, 60438 Frankfurt am Main, Germany
| | - Werner Kühlbrandt
- Max Planck Institute of Biophysics, Max-von-Laue-Str.3, 60438 Frankfurt am Main, Germany
| | - Maike Bublitz
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
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Chemically based transmissible ER stress protocols are unsuitable to study cell-to-cell UPR transmission. Biochem J 2021; 477:4037-4051. [PMID: 33016323 DOI: 10.1042/bcj20200699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 09/29/2020] [Accepted: 10/02/2020] [Indexed: 12/14/2022]
Abstract
Renal epithelial cells regulate the destructive activity of macrophages and participate in the progression of kidney diseases. Critically, the Unfolded Protein Response (UPR), which is activated in renal epithelial cells in the course of kidney injury, is required for the optimal differentiation and activation of macrophages. Given that macrophages are key regulators of renal inflammation and fibrosis, we suppose that the identification of mediators that are released by renal epithelial cells under Endoplasmic Reticulum (ER) stress and transmitted to macrophages is a critical issue to address. Signals leading to a paracrine transmission of ER stress (TERS) from a donor cell to a recipient cells could be of paramount importance to understand how ER-stressed cells shape the immune microenvironment. Critically, the vast majority of studies that have examined TERS used thaspigargin as an inducer of ER stress in donor cells in cellular models. By using multiple sources of ER stress, we evaluated if human renal epithelial cells undergoing ER stress can transmit the UPR to human monocyte-derived macrophages and if such TERS can modulate the inflammatory profiles of these cells. Our results indicate that carry-over of thapsigargin is a confounding factor in chemically based TERS protocols classically used to induce ER Stress in donor cells. Hence, such protocols are not suitable to study the TERS phenomenon and to identify its mediators. In addition, the absence of TERS transmission in more physiological models of ER stress indicates that cell-to-cell UPR transmission is not a universal feature in cultured cells.
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Pagliaro L, Marchesini M, Roti G. Targeting oncogenic Notch signaling with SERCA inhibitors. J Hematol Oncol 2021; 14:8. [PMID: 33407740 PMCID: PMC7789735 DOI: 10.1186/s13045-020-01015-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 12/02/2020] [Indexed: 12/26/2022] Open
Abstract
P-type ATPase inhibitors are among the most successful and widely prescribed therapeutics in modern pharmacology. Clinical transition has been safely achieved for H+/K+ ATPase inhibitors such as omeprazole and Na+/K+-ATPase inhibitors like digoxin. However, this is more challenging for Ca2+-ATPase modulators due to the physiological role of Ca2+ in cardiac dynamics. Over the past two decades, sarco-endoplasmic reticulum Ca2+-ATPase (SERCA) modulators have been studied as potential chemotherapy agents because of their Ca2+-mediated pan-cancer lethal effects. Instead, recent evidence suggests that SERCA inhibition suppresses oncogenic Notch1 signaling emerging as an alternative to γ-secretase modulators that showed limited clinical activity due to severe side effects. In this review, we focus on how SERCA inhibitors alter Notch1 signaling and show that Notch on-target-mediated antileukemia properties of these molecules can be achieved without causing overt Ca2+ cellular overload.
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Affiliation(s)
- Luca Pagliaro
- Department of Medicine and Surgery, University of Parma, 43126, Parma, Italy
| | - Matteo Marchesini
- Department of Medicine and Surgery, University of Parma, 43126, Parma, Italy
| | - Giovanni Roti
- Department of Medicine and Surgery, University of Parma, 43126, Parma, Italy.
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Christensen SB, Simonsen HT, Engedal N, Nissen P, Møller JV, Denmeade SR, Isaacs JT. From Plant to Patient: Thapsigargin, a Tool for Understanding Natural Product Chemistry, Total Syntheses, Biosynthesis, Taxonomy, ATPases, Cell Death, and Drug Development. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2021; 115:59-114. [PMID: 33797641 DOI: 10.1007/978-3-030-64853-4_2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Thapsigargin, the first representative of the hexaoxygenated guaianolides, was isolated 40 years ago in order to understand the skin-irritant principles of the resin of the umbelliferous plant Thapsia garganica. The pronounced cytotoxicity of thapsigargin is caused by highly selective inhibition of the intracellular sarco-endoplasmic Ca2+-ATPase (SERCA) situated on the membrane of the endo- or sarcoplasmic reticulum. Thapsigargin is selective to the SERCA pump and to a minor extent the secretory pathway Ca2+/Mn2+ ATPase (SPCA) pump. Thapsigargin has become a tool for investigation of the importance of SERCA in intracellular calcium homeostasis. In addition, complex formation of thapsigargin with SERCA has enabled crystallization and structure determination of calcium-free states by X-ray crystallography. These results led to descriptions of the mechanism of action and kinetic properties of SERCA and other ATPases. Inhibition of SERCA depletes Ca2+ from the sarco- and endoplasmic reticulum provoking the unfolded protein response, and thereby has enabled new studies on the mechanism of cell death. Development of protocols for selective transformation of thapsigargin disclosed the chemistry and facilitated total synthesis of the molecule. Conversion of trilobolide into thapsigargin offered an economically feasible sustainable source of thapsigargin, which enables a future drug production. Principles for prodrug development were used by conjugating a payload derived from thapsigargin with a hydrophilic peptide selectively cleaved by proteases in the tumor. Mipsagargin was developed in order to obtain a drug for treatment of cancer diseases characterized by the presence of prostate specific membrane antigen (PSMA) in the neovascular tissue of the tumors. Even though mipsagargin showed interesting clinical effects the results did not encourage funding and consequently the attempt to register the drug has been abandoned. In spite of this disappointing fact, the research performed to develop the drug has resulted in important scientific discoveries concerning the chemistry, biosynthesis and biochemistry of sesquiterpene lactones, the mechanism of action of ATPases including SERCA, mechanisms for cell death caused by the unfolded protein response, and the use of prodrugs for cancer-targeting cytotoxins. The presence of toxins in only some species belonging to Thapsia also led to a major revision of the taxonomy of the genus.
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Affiliation(s)
- Søren Brøgger Christensen
- Department of Drug Design and Pharmacology, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen Ø, Denmark.
| | - Henrik Toft Simonsen
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads, Bld 223, 2800, Kgs. Lyngby, Denmark
| | - Nikolai Engedal
- Department of Tumor Biology, Institute for Cancer Research, University Hospital, Montebello, 0379, Oslo, Norway
| | - Poul Nissen
- Department of Molecular Biology and Genetics, Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Gustav Wieds Vej 10C, 8000, Aarhus C, Denmark
| | - Jesper Vuust Møller
- Department of Biomedicine, Aarhus University, Ole Worms Allé 3, Bld 1182, Room 114, 8000, Aarhus C, Denmark
| | - Samuel R Denmeade
- Department of Oncology, Prostate Cancer Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Maryland, The Johns Hopkins University School of Medicine, Baltimore, The Bunting-Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD, 21231, USA
| | - John T Isaacs
- Department of Oncology, Prostate Cancer Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Maryland, The Johns Hopkins University School of Medicine, Baltimore, The Bunting-Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD, 21231, USA
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Thapsigargin-From Traditional Medicine to Anticancer Drug. Int J Mol Sci 2020; 22:ijms22010004. [PMID: 33374919 PMCID: PMC7792614 DOI: 10.3390/ijms22010004] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/16/2020] [Accepted: 12/18/2020] [Indexed: 02/06/2023] Open
Abstract
A sesquiterpene lactone, thapsigargin, is a phytochemical found in the roots and fruits of Mediterranean plants from Thapsia L. species that have been used for centuries in folk medicine to treat rheumatic pain, lung diseases, and female infertility. More recently thapsigargin was found to be a potent cytotoxin that induces apoptosis by inhibiting the sarcoplasmic/endoplasmic reticulum Ca2+ ATPase (SERCA) pump, which is necessary for cellular viability. This biological activity encouraged studies on the use of thapsigargin as a novel antineoplastic agent, which were, however, hampered due to high toxicity of this compound to normal cells. In this review, we summarized the recent knowledge on the biological activity and molecular mechanisms of thapsigargin action and advances in the synthesis of less-toxic thapsigargin derivatives that are being developed as novel anticancer drugs.
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Large Scale Conversion of Trilobolide into the Payload of Mipsagargin: 8- O-(12-Aminododecanoyl)-8- O-Debutanoylthapsigargin. Biomolecules 2020; 10:biom10121640. [PMID: 33291419 PMCID: PMC7762042 DOI: 10.3390/biom10121640] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 11/26/2020] [Accepted: 12/03/2020] [Indexed: 12/11/2022] Open
Abstract
In spite of the impressing cytotoxicity of thapsigargin (Tg), this compound cannot be used as a chemotherapeutic drug because of general toxicity, causing unacceptable side effects. Instead, a prodrug targeted towards tumors, mipsagargin, was brought into clinical trials. What substantially reduces the clinical potential is the limited access to Tg and its derivatives and cost-inefficient syntheses with unacceptably low yields. Laser trilobum, which contains a structurally related sesquiterpene lactone, trilobolide (Tb), is successfully cultivated. Here, we report scalable isolation of Tb from L. trilobum and a transformation of Tb to 8-O-(12-aminododecanoyl)-8-O-debutanoylthapsigargin in seven steps. The use of cultivated L. trilobum offers an unlimited source of the active principle in mipsagargin.
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Evolution of Pauson-Khand Reaction: Strategic Applications in Total Syntheses of Architecturally Complex Natural Products (2016–2020). Catalysts 2020. [DOI: 10.3390/catal10101199] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Metal-mediated cyclizations are important transformations in a natural product total synthesis. The Pauson-Khand reaction, particularly powerful for establishing cyclopentenone-containing structures, is distinguished as one of the most attractive annulation processes routinely employed in synthesis campaigns. This review covers Co, Rh, and Pd catalyzed Pauson-Khand reaction and summarizes its strategic applications in total syntheses of structurally complex natural products in the last five years. Additionally, the hetero-Pauson-Khand reaction in the synthesis of heterocycles will also be discussed. Focusing on the panorama of organic synthesis, this review highlights the strategically developed Pauson-Khand reaction in fulfilling total synthetic tasks and its synthetic attractiveness is aimed to be illustrated.
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Co-targeting Mitochondrial Ca 2+ Homeostasis and Autophagy Enhances Cancer Cells' Chemosensitivity. iScience 2020; 23:101263. [PMID: 32585596 PMCID: PMC7322071 DOI: 10.1016/j.isci.2020.101263] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 04/17/2020] [Accepted: 06/08/2020] [Indexed: 12/22/2022] Open
Abstract
Mitochondria are important cell death checkpoints, and mitochondrial Ca2+ overload is considered as a potent apoptotic intrinsic pathway inducer. Here, we report that this Ca2+ apoptosis link is largely ineffective in inducing cell-death just by itself and required a concomitant inhibition of autophagy to counteract its pro-survival action. In such condition, an acute mitochondrial stress revealed by a DRP1-mediated mitochondrial dynamic remodeling is observed concomitantly with mitochondrial depolarization, release of cytochrome c, and efficient apoptosis induction. We also uncover that mitochondrial Ca2+ status modulates the function of autophagy as a sensitizer for chemotherapies. This priming mediated by mitochondrial Ca2+ overload and inhibition of autophagy sensitizes many cancer cells types to different chemotherapies with independent mechanisms of action. Collectively, our results redefine an important cell signaling pathway, uncovering new combined therapies for the treatment of diseases associated with mitochondrial Ca2+ homeostasis disorders such as cancer.
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van Ziel AM, Scheper W. The UPR in Neurodegenerative Disease: Not Just an Inside Job. Biomolecules 2020; 10:biom10081090. [PMID: 32707908 PMCID: PMC7465596 DOI: 10.3390/biom10081090] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 07/16/2020] [Accepted: 07/20/2020] [Indexed: 12/26/2022] Open
Abstract
Neurons are highly specialized cells that continuously and extensively communicate with other neurons, as well as glia cells. During their long lifetime, the post-mitotic neurons encounter many stressful situations that can disrupt protein homeostasis (proteostasis). The importance of tight protein quality control is illustrated by neurodegenerative disorders where disturbed neuronal proteostasis causes neuronal dysfunction and loss. For their unique function, neurons require regulated and long-distance transport of membrane-bound cargo and organelles. This highlights the importance of protein quality control in the neuronal endomembrane system, to which the unfolded protein response (UPR) is instrumental. The UPR is a highly conserved stress response that is present in all eukaryotes. However, recent studies demonstrate the existence of cell-type-specific aspects of the UPR, as well as cell non-autonomous UPR signaling. Here we discuss these novel insights in view of the complex cellular architecture of the brain and the implications for neurodegenerative diseases.
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Affiliation(s)
- Anna Maria van Ziel
- Department of Clinical Genetics, Amsterdam University Medical Centers location VUmc, 1081 HV Amsterdam, The Netherlands;
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Vrije Universiteit (VU), 1081 HV Amsterdam, The Netherlands
| | - Wiep Scheper
- Department of Clinical Genetics, Amsterdam University Medical Centers location VUmc, 1081 HV Amsterdam, The Netherlands;
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Vrije Universiteit (VU), 1081 HV Amsterdam, The Netherlands
- Correspondence: ; Tel.: +31-20-5982771
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15
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Lindner P, Christensen SB, Nissen P, Møller JV, Engedal N. Cell death induced by the ER stressor thapsigargin involves death receptor 5, a non-autophagic function of MAP1LC3B, and distinct contributions from unfolded protein response components. Cell Commun Signal 2020; 18:12. [PMID: 31987044 PMCID: PMC6986015 DOI: 10.1186/s12964-019-0499-z] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 12/16/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Cell death triggered by unmitigated endoplasmic reticulum (ER) stress plays an important role in physiology and disease, but the death-inducing signaling mechanisms are incompletely understood. To gain more insight into these mechanisms, the ER stressor thapsigargin (Tg) is an instrumental experimental tool. Additionally, Tg forms the basis for analog prodrugs designed for cell killing in targeted cancer therapy. Tg induces apoptosis via the unfolded protein response (UPR), but how apoptosis is initiated, and how individual effects of the various UPR components are integrated, is unclear. Furthermore, the role of autophagy and autophagy-related (ATG) proteins remains elusive. METHODS To systematically address these key questions, we analyzed the effects of Tg and therapeutically relevant Tg analogs in two human cancer cell lines of different origin (LNCaP prostate- and HCT116 colon cancer cells), using RNAi and inhibitory drugs to target death receptors, UPR components and ATG proteins, in combination with measurements of cell death by fluorescence imaging and propidium iodide staining, as well as real-time RT-PCR and western blotting to monitor caspase activity, expression of ATG proteins, UPR components, and downstream ER stress signaling. RESULTS In both cell lines, Tg-induced cell death depended on death receptor 5 and caspase-8. Optimal cytotoxicity involved a non-autophagic function of MAP1LC3B upstream of procaspase-8 cleavage. PERK, ATF4 and CHOP were required for Tg-induced cell death, but surprisingly acted in parallel rather than as a linear pathway; ATF4 and CHOP were independently required for Tg-mediated upregulation of death receptor 5 and MAP1LC3B proteins, whereas PERK acted via other pathways. Interestingly, IRE1 contributed to Tg-induced cell death in a cell type-specific manner. This was linked to an XBP1-dependent activation of c-Jun N-terminal kinase, which was pro-apoptotic in LNCaP but not HCT116 cells. Molecular requirements for cell death induction by therapy-relevant Tg analogs were identical to those observed with Tg. CONCLUSIONS Together, our results provide a new, integrated understanding of UPR signaling mechanisms and downstream mediators that induce cell death upon Tg-triggered, unmitigated ER stress. Video Abstract.
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Affiliation(s)
- Paula Lindner
- Centre for Molecular Medicine Norway (NCMM), Nordic EMBL Partnership for Molecular Medicine, University of Oslo, P.O. Box 1137, Blindern, N-0318 Oslo, Norway
- Danish Research Institute of Translational Neuroscience (DANDRITE), Nordic EMBL Partnership for Molecular Medicine, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | | | - Poul Nissen
- Danish Research Institute of Translational Neuroscience (DANDRITE), Nordic EMBL Partnership for Molecular Medicine, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | | | - Nikolai Engedal
- Centre for Molecular Medicine Norway (NCMM), Nordic EMBL Partnership for Molecular Medicine, University of Oslo, P.O. Box 1137, Blindern, N-0318 Oslo, Norway
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16
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Rimpelová S, Jurášek M, Peterková L, Bejček J, Spiwok V, Majdl M, Jirásko M, Buděšínský M, Harmatha J, Kmoníčková E, Drašar P, Ruml T. Archangelolide: A sesquiterpene lactone with immunobiological potential from Laserpitium archangelica. Beilstein J Org Chem 2019; 15:1933-1944. [PMID: 31501660 PMCID: PMC6720059 DOI: 10.3762/bjoc.15.189] [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: 05/31/2019] [Accepted: 07/30/2019] [Indexed: 01/03/2023] Open
Abstract
Sesquiterpene lactones are secondary plant metabolites with sundry biological effects. In plants, they are synthesized, among others, for pesticidal and antimicrobial effects. Two such compounds, archangelolide and trilobolide of the guaianolide type, are structurally similar to the well-known and clinically tested lactone thapsigargin. While trilobolide has already been studied by us and others, there are only scarce reports on the biological activity of archangelolide. Here we present the preparation of its fluorescent derivative based on a dansyl moiety using azide-alkyne Huisgen cycloaddition having obtained the two sesquiterpene lactones from the seeds of Laserpitium archangelica Wulfen using supercritical CO2 extraction. We show that dansyl-archangelolide localizes in the endoplasmic reticulum of living cells similarly to trilobolide; localization in mitochondria was also detected. This led us to a more detailed study of the anticancer potential of archangelolide. Interestingly, we found that neither archangelolide nor its dansyl conjugate did exhibit cytotoxic effects in contrast to the structurally closely related counterparts trilobolide and thapsigargin. We explain this observation by a molecular dynamics simulation, in which, in contrast to trilobolide, archangelolide did not bind into the sarco/endoplasmic reticular calcium ATPase cavity utilized by thapsigargin. Last, but not least, archangelolide exhibited anti-inflammatory activity, which makes it promising compound for medicinal purposes.
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Affiliation(s)
- Silvie Rimpelová
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Michal Jurášek
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Lucie Peterková
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Jiří Bejček
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Vojtěch Spiwok
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Miloš Majdl
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Michal Jirásko
- Charles University in Prague, Faculty of Medicine in Pilsen, 301 66 Pilsen, Czech Republic
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic
| | - Juraj Harmatha
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic
| | - Eva Kmoníčková
- Charles University in Prague, Faculty of Medicine in Pilsen, 301 66 Pilsen, Czech Republic.,Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, v.v.i., 14220 Prague 4, Czech Republic
| | - Pavel Drašar
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Tomáš Ruml
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
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17
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Wu L, Huang X, Kuang Y, Xing Z, Deng X, Luo Z. Thapsigargin induces apoptosis in adrenocortical carcinoma by activating endoplasmic reticulum stress and the JNK signaling pathway: an in vitro and in vivo study. DRUG DESIGN DEVELOPMENT AND THERAPY 2019; 13:2787-2798. [PMID: 31496655 PMCID: PMC6697672 DOI: 10.2147/dddt.s209947] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 07/25/2019] [Indexed: 12/14/2022]
Abstract
Objective Thapsigargin (TG) is a natural product that exists in most parts of the plant Thapsia garganica L. and possesses potential anticancer activities against variety tumor cell lines. TG induces endoplasmic reticulum (ER) stress and apoptosis by inhibiting cancer growth. However, the antineoplastic effect of TG in human adrenocortical carcinoma (ACC) cells is still unknown. Methods In this study, two human ACC cell lines including SW-13 and NCI-H295R were employed to explore the potential role of TG in ACC. A mouse xenograft model of SW-13 cells was established to verify the role of TG in vivo. The cell viability was tested using Cell Counting Kit-8 and Transwell assays. Flow cytometry and Hoechst 33,258 staining were employed to analyze cell apoptosis. RT-qPCR and Western blot (WB) were performed to explore the underlying mechanism of TG-induced apoptosis in ACC cells. Results The results indicated that TG dose-dependently inhibited proliferation, migration and invasion in human ACC cells. TG significantly increased the mitochondrial rate of apoptosis and ER stress activity in ACC cells and suppressed ACC xenograft growth in vivo. In addition, the expression of Jun N-terminal kinase (JNK) signaling-related genes and proteins was upregulated by the treatment with TG. Conclusion Our findings suggest that TG inhibits the viability of ACC cells by inducing apoptosis through the activation of JNK signaling. Thus, TG is expected to be a potential candidate for the treatment of ACC.
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Affiliation(s)
- Lili Wu
- Department of Integrated Medicine, The Affiliated Tumor Hospital of Guangxi Medical University, Nanning, Guangxi 530021, People's Republic of China
| | - Xuemei Huang
- Department of Endocrinology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, People's Republic of China
| | - Yaqi Kuang
- Department of Endocrinology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, People's Republic of China
| | - Zengmiao Xing
- Department of Endocrinology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, People's Republic of China
| | - Xiujun Deng
- Department of Endocrinology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, People's Republic of China
| | - Zuojie Luo
- Department of Endocrinology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, People's Republic of China
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18
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Sanogo Y, Othman RB, Dhambri S, Selkti M, Jeuken A, Prunet J, Férézou JP, Ardisson J, Lannou MI, Sorin G. Ti(II) and Rh(I) Complexes as Reagents toward a Thapsigargin Core. J Org Chem 2019; 84:5821-5830. [PMID: 30964681 DOI: 10.1021/acs.joc.8b03249] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A novel approach toward the [5-7]fused bicyclic core of thapsigargin, a subnanomolar inhibitor of the endo/sarcoplasmic calcium ATPase (SERCA), is presented. The synthetic route includes an original Ti(II)-mediated hydroxy-directed reductive coupling of an enantiomerically enriched propargylic alcohol and an intramolecular Rh(I)-catalyzed cyclocarbonylation reaction as key steps. Interestingly, through the first experiments of titanocene-mediated reductive cyclization of a 1,8-enyne, a seven-membered cycle was isolated as a unique product with a total diastereoselectivity.
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Affiliation(s)
- Youssouf Sanogo
- Unité CNRS UMR 8638 , Université Paris Descartes, Faculté de Pharmacie , Sorbonne Paris Cité, 4 Avenue de l'Observatoire , Paris Cedex 06 75270 , France
| | - Raja Ben Othman
- Unité CNRS UMR 8638 , Université Paris Descartes, Faculté de Pharmacie , Sorbonne Paris Cité, 4 Avenue de l'Observatoire , Paris Cedex 06 75270 , France
| | - Sabrina Dhambri
- Unité CNRS UMR 8638 , Université Paris Descartes, Faculté de Pharmacie , Sorbonne Paris Cité, 4 Avenue de l'Observatoire , Paris Cedex 06 75270 , France
| | - Mohamed Selkti
- Unité CNRS UMR 8015 , Université Paris Descartes, Faculté de Pharmacie , Sorbonne Paris Cité, 4 Avenue de l'Observatoire , Paris Cedex 06 75270 , France
| | - Alan Jeuken
- WestCHEM, School of Chemistry , University of Glasgow , Joseph Black Building, University Avenue , Glasgow G12 8QQ , United Kingdom
| | - Joëlle Prunet
- WestCHEM, School of Chemistry , University of Glasgow , Joseph Black Building, University Avenue , Glasgow G12 8QQ , United Kingdom
| | - Jean-Pierre Férézou
- Méthodologie, Synthèse et Molécules Thérapeutiques, ICMMO (CNRS UMR 8182) , Université Paris-Sud, Université Paris-Saclay , Bâtiment 410 , Orsay F-91405 , France
| | - Janick Ardisson
- Unité CNRS UMR 8638 , Université Paris Descartes, Faculté de Pharmacie , Sorbonne Paris Cité, 4 Avenue de l'Observatoire , Paris Cedex 06 75270 , France
| | - Marie-Isabelle Lannou
- Unité CNRS UMR 8638 , Université Paris Descartes, Faculté de Pharmacie , Sorbonne Paris Cité, 4 Avenue de l'Observatoire , Paris Cedex 06 75270 , France
| | - Geoffroy Sorin
- Unité CNRS UMR 8638 , Université Paris Descartes, Faculté de Pharmacie , Sorbonne Paris Cité, 4 Avenue de l'Observatoire , Paris Cedex 06 75270 , France
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19
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Kempton RJ, Kidd-Kautz TA, Laurenceau S, Paula S. Heck- and Suzuki-coupling approaches to novel hydroquinone inhibitors of calcium ATPase. Beilstein J Org Chem 2019; 15:971-975. [PMID: 31164934 PMCID: PMC6541364 DOI: 10.3762/bjoc.15.94] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 04/15/2019] [Indexed: 11/23/2022] Open
Abstract
In this study, we explored Heck- and Suzuki-coupling methodology to modify the template 2,5-di-tert-butylhydroquinone (BHQ, 2), an inhibitor of the enzyme sarco/endoplasmic reticulum calcium ATPase (SERCA). We found that by utilizing Suzuki coupling, we could successfully attach a six-carbon tether to BHQ that terminated in a leucine moiety to obtain target 14. Similar to related compounds based on the structure of the natural product thapsigargin, 14 displayed inhibitory potency against SERCA activity. This makes 14 a suitable candidate for the future attachment of a deactivating peptide to convey specificity for prostate cancer cells.
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Affiliation(s)
- Robert J Kempton
- Department of Chemistry and Biochemistry, Northern Kentucky University, Nunn Drive, Highland Heights, KY 41099, USA
| | - Taylor A Kidd-Kautz
- Department of Chemistry and Biochemistry, Northern Kentucky University, Nunn Drive, Highland Heights, KY 41099, USA
| | - Soizic Laurenceau
- Department of Chemistry and Biochemistry, Northern Kentucky University, Nunn Drive, Highland Heights, KY 41099, USA
| | - Stefan Paula
- Department of Chemistry, Purdue University, Oval Drive, West Lafayette, IN 47907, USA
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20
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Espinoza-Fonseca LM. Probing the effects of nonannular lipid binding on the stability of the calcium pump SERCA. Sci Rep 2019; 9:3349. [PMID: 30833659 PMCID: PMC6399444 DOI: 10.1038/s41598-019-40004-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 02/07/2019] [Indexed: 01/14/2023] Open
Abstract
The calcium pump SERCA is a transmembrane protein that is critical for calcium transport in cells. SERCA resides in an environment made up largely by the lipid bilayer, so lipids play a central role on its stability and function. Studies have provided insights into the effects of annular and bulk lipids on SERCA activation, but the role of a nonannular lipid site in the E2 intermediate state remains elusive. Here, we have performed microsecond molecular dynamics simulations to probe the effects of nonannular lipid binding on the stability and structural dynamics of the E2 state of SERCA. We found that the structural integrity and stability of the E2 state is independent of nonannular lipid binding, and that occupancy of a lipid molecule at this site does not modulate destabilization of the E2 state, a step required to initiate the transition toward the competent E1 state. We also found that binding of the nonannular lipid does not induce direct allosteric control of the intrinsic functional dynamics the E2 state. We conclude that nonannular lipid binding is not necessary for the stability of the E2 state, but we speculate that it becomes functionally significant during the E2-to-E1 transition of the pump.
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Affiliation(s)
- L Michel Espinoza-Fonseca
- Center for Arrhythmia Research, Department of Internal Medicine, Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, MI, 48109, USA.
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21
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Autzen HE, Koldsø H, Stansfeld PJ, Gourdon P, Sansom MSP, Nissen P. Interactions of a Bacterial Cu(I)-ATPase with a Complex Lipid Environment. Biochemistry 2018; 57:4063-4073. [DOI: 10.1021/acs.biochem.8b00326] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Henriette E. Autzen
- Centre for Membrane Pumps in Cells and Disease (PUMPkin), Danish National Research Foundation, 8000 Aarhus, Denmark
- Department of Molecular Biology and Genetics, Aarhus University, Gustav Wieds vej 10C, 8000 Aarhus C, Denmark
| | - Heidi Koldsø
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Phillip J. Stansfeld
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Pontus Gourdon
- Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen N, Denmark
| | - Mark S. P. Sansom
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Poul Nissen
- Centre for Membrane Pumps in Cells and Disease (PUMPkin), Danish National Research Foundation, 8000 Aarhus, Denmark
- Department of Molecular Biology and Genetics, Aarhus University, Gustav Wieds vej 10C, 8000 Aarhus C, Denmark
- Danish Research Institute of Translational Neuroscience (DANDRITE), Nordic-EMBL Partnership for Molecular Medicine, Aarhus University, 8000 Aarhus C, Denmark
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22
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Diedrich D, Wildner AC, Silveira TF, Silva GNS, Santos FD, da Silva EF, do Canto VP, Visioli F, Gosmann G, Bergold AM, Zimmer AR, Netz PA, Gnoatto SCB. SERCA plays a crucial role in the toxicity of a betulinic acid derivative with potential antimalarial activity. Chem Biol Interact 2018; 287:70-77. [PMID: 29604267 DOI: 10.1016/j.cbi.2018.03.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 02/28/2018] [Accepted: 03/25/2018] [Indexed: 02/08/2023]
Abstract
Malaria is one of the most significant infectious diseases that affect poor populations in tropical areas throughout the world. Plants have been shown to be a good source for the development of new antimalarial chemotherapeutic agents, as shown for the discovery of quinine and artemisinin derivatives. Our research group has been working with semisynthetic triterpene derivatives that show potential antimalarial activity toward different strains of Plasmodium falciparum by specifically modulating calcium pathways in the parasite. Promising results were obtained for nanomolar concentrations of the semisynthetic betulinic acid derivative LAFIS13 against the P. falciparum 3D7 strain in vitro, with a selectivity index of 18 compared to a mammalian cell line. Continuing these studies, we present here in vitro and in vivo toxicological evaluations of this compound, followed by docking studies with PfATP6, a sarco/endoplasmic reticulum Ca+2-ATPase (SERCA) protein. LAFIS13 showed an LD50 between 300 and 50 mg/kg, and the acute administration of 50 mg/kg (i.p.) had no negative effects on hematological, biochemical and histopathological parameters. Based on the results of the in vitro assays, LAFIS13 not exerted significant effects on coagulation parameters of human peripheral blood, but a hemolytic activity was verified at higher concentrations. According to the molecular docking study, the PfATP6 protein may be a target for LAFIS13, which corroborates its previously reported modulatory effects on calcium homeostasis in the parasite. Notably, LAFIS13 showed a higher selectivity for the mammalian SERCA protein than for PfATP6, thus impairing the selectivity between parasite and host. In summary, the direct interaction with calcium pumps and the hemolytic potential of the compound proved to be plausible mechanism of LAFIS13 toxicity.
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Affiliation(s)
- Denise Diedrich
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil
| | - Andreia C Wildner
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil
| | - Thayse F Silveira
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil
| | - Gloria N S Silva
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil
| | - Francine Dos Santos
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil
| | - Elenilson F da Silva
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil
| | - Vanessa P do Canto
- Faculdade de Odontologia, Departamento de Patologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90035-003, Brazil
| | - Fernanda Visioli
- Faculdade de Odontologia, Departamento de Patologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90035-003, Brazil
| | - Grace Gosmann
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil
| | - Ana M Bergold
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil
| | - Aline R Zimmer
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil
| | - Paulo A Netz
- Programa de Pós-graduação em Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, 91501-970, Brazil
| | - Simone C B Gnoatto
- Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90610-000, Brazil.
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23
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Bublitz M, Kjellerup L, Cohrt KO, Gordon S, Mortensen AL, Clausen JD, Pallin TD, Hansen JB, Fuglsang AT, Dalby-Brown W, Winther AML. Tetrahydrocarbazoles are a novel class of potent P-type ATPase inhibitors with antifungal activity. PLoS One 2018; 13:e0188620. [PMID: 29293507 PMCID: PMC5749684 DOI: 10.1371/journal.pone.0188620] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 11/10/2017] [Indexed: 11/19/2022] Open
Abstract
We have identified a series of tetrahydrocarbazoles as novel P-type ATPase inhibitors. Using a set of rationally designed analogues, we have analyzed their structure-activity relationship using functional assays, crystallographic data and computational modeling. We found that tetrahydrocarbazoles inhibit adenosine triphosphate (ATP) hydrolysis of the fungal H+-ATPase, depolarize the fungal plasma membrane and exhibit broad-spectrum antifungal activity. Comparative inhibition studies indicate that many tetrahydrocarbazoles also inhibit the mammalian Ca2+-ATPase (SERCA) and Na+,K+-ATPase with an even higher potency than Pma1. We have located the binding site for this compound class by crystallographic structure determination of a SERCA-tetrahydrocarbazole complex to 3.0 Å resolution, finding that the compound binds to a region above the ion inlet channel of the ATPase. A homology model of the Candida albicans H+-ATPase based on this crystal structure, indicates that the compounds could bind to the same pocket and identifies pocket extensions that could be exploited for selectivity enhancement. The results of this study will aid further optimization towards selective H+-ATPase inhibitors as a new class of antifungal agents.
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Affiliation(s)
- Maike Bublitz
- Department of Biochemistry, University of Oxford, Oxford, United Kingdom
| | - Lasse Kjellerup
- Pcovery, Copenhagen N, Denmark
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
| | | | | | | | | | | | | | - Anja Thoe Fuglsang
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
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24
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Dey S, Bajaj SO. Promising anticancer drug thapsigargin: A perspective toward the total synthesis. SYNTHETIC COMMUN 2017. [DOI: 10.1080/00397911.2017.1386789] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Supriya Dey
- Department of Chemistry, The Scripps Research Institute, La Jolla, California, USA
| | - Sumit O. Bajaj
- Department of Chemistry, The Scripps Research Institute, La Jolla, California, USA
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25
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Yamasaki K, Daiho T, Danko S, Yasuda S, Suzuki H. Nanodisc-based kinetic assays reveal distinct effects of phospholipid headgroups on the phosphoenzyme transition of sarcoplasmic reticulum Ca 2+-ATPase. J Biol Chem 2017; 292:20218-20227. [PMID: 29032359 DOI: 10.1074/jbc.m117.816702] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 10/10/2017] [Indexed: 01/08/2023] Open
Abstract
Sarco(endo)plasmic reticulum Ca2+-ATPase catalyzes ATP-driven Ca2+ transport from the cytoplasm to the lumen and is critical for a range of cell functions, including muscle relaxation. Here, we investigated the effects of the headgroups of the 1-palmitoyl-2-oleoyl glycerophospholipids phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylserine (PS), and phosphatidylglycerol (PG) on sarcoplasmic reticulum (SR) Ca2+-ATPase embedded into a nanodisc, a lipid-bilayer construct harboring the specific lipid. We found that Ca2+-ATPase activity in a PC bilayer is comparable with that of SR vesicles and is suppressed in the other phospholipids, especially in PS. Ca2+ affinity at the high-affinity transport sites in PC was similar to that of SR vesicles, but 2-3-fold reduced in PE and PS. Ca2+ on- and off-rates in the non-phosphorylated ATPase were markedly reduced in PS. Rate-limiting phosphoenzyme (EP) conformational transition in 0.1 m KCl was as rapid in PC as in SR vesicles, but slowed in other phospholipids, especially in PS. Using kinetic plots of the logarithm of rate versus the square of mean activity coefficient of solutes in 0.1-1 m KCl, we noted that PC is optimal for the EP transition, but PG and especially PS had markedly unfavorable electrostatic effects, and PE exhibited a strong non-electrostatic restriction. Thus, the major SR membrane lipid PC is optimal for all steps and, unlike the other headgroups, contributes favorable electrostatics and non-electrostatic elements during the EP transition. Our analyses further revealed that the surface charge of the lipid bilayer directly modulates the transition rate.
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Affiliation(s)
- Kazuo Yamasaki
- Department of Biochemistry, Asahikawa Medical University, Midorigaoka-Higashi, Asahikawa 078-8510, Japan.
| | - Takashi Daiho
- Department of Biochemistry, Asahikawa Medical University, Midorigaoka-Higashi, Asahikawa 078-8510, Japan
| | - Stefania Danko
- Department of Biochemistry, Asahikawa Medical University, Midorigaoka-Higashi, Asahikawa 078-8510, Japan
| | - Satoshi Yasuda
- Department of Biochemistry, Asahikawa Medical University, Midorigaoka-Higashi, Asahikawa 078-8510, Japan
| | - Hiroshi Suzuki
- Department of Biochemistry, Asahikawa Medical University, Midorigaoka-Higashi, Asahikawa 078-8510, Japan
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26
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Burrows LC, Jesikiewicz LT, Lu G, Geib SJ, Liu P, Brummond KM. Computationally Guided Catalyst Design in the Type I Dynamic Kinetic Asymmetric Pauson-Khand Reaction of Allenyl Acetates. J Am Chem Soc 2017; 139:15022-15032. [PMID: 29022341 DOI: 10.1021/jacs.7b07121] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The Rh(I)-catalyzed allenic Pauson-Khand reaction (APKR) is an efficient, redox-neutral method of synthesizing α-acyloxy cyclopentenones. An enantioselective APKR could provide access to chiral, nonracemic α-acyloxy and α-hydroxy cyclopentenones and their corresponding redox derivatives, such as thapsigargin, a cytotoxic natural product with potent antitumor activity. Rapid scrambling of axial chirality of allenyl acetates in the presence of Rh(I) catalysts enables the conversion of racemic allene to enantiopure cyclopentenone product in a dynamic kinetic asymmetric transformation (DyKAT). A combined experimental and computational approach was taken to develop an effective catalytic system to achieve the asymmetric transformation. The optimization of the denticity, and steric and electronic properties of the ancillary ligand (initially (S)-MonoPhos, 58:42 er), afforded a hemilabile bidentate (S)-MonoPhos-alkene-Rh(I) catalyst that provided α-acyloxy cyclopentenone product in up to 14:86 er. Enantioselectivity of the Rh(I)-(S)-MonoPhos-alkene catalyst was rationalized using ligand-substrate steric interactions and distortion energies in the computed transition states. This asymmetric APKR of allenyl acetates is a rare example of a Type I DyKAT reaction of an allene, the first example of DyKAT in a cyclocarbonylation reaction, and the first catalyst-controlled enantioselective APKR.
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Affiliation(s)
- Lauren C Burrows
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Luke T Jesikiewicz
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Gang Lu
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Steven J Geib
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Kay M Brummond
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
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27
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Sehgal P, Szalai P, Olesen C, Praetorius HA, Nissen P, Christensen SB, Engedal N, Møller JV. Inhibition of the sarco/endoplasmic reticulum (ER) Ca 2+-ATPase by thapsigargin analogs induces cell death via ER Ca 2+ depletion and the unfolded protein response. J Biol Chem 2017; 292:19656-19673. [PMID: 28972171 DOI: 10.1074/jbc.m117.796920] [Citation(s) in RCA: 123] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 09/15/2017] [Indexed: 11/06/2022] Open
Abstract
Calcium (Ca2+) is a fundamental regulator of cell signaling and function. Thapsigargin (Tg) blocks the sarco/endoplasmic reticulum (ER) Ca2+-ATPase (SERCA), disrupts Ca2+ homeostasis, and causes cell death. However, the exact mechanisms whereby SERCA inhibition induces cell death are incompletely understood. Here, we report that low (0.1 μm) concentrations of Tg and Tg analogs with various long-chain substitutions at the O-8 position extensively inhibit SERCA1a-mediated Ca2+ transport. We also found that, in both prostate and breast cancer cells, exposure to Tg or Tg analogs for 1 day caused extensive drainage of the ER Ca2+ stores. This Ca2+ depletion was followed by markedly reduced cell proliferation rates and morphological changes that developed over 2-4 days and culminated in cell death. Interestingly, these changes were not accompanied by bulk increases in cytosolic Ca2+ levels. Moreover, knockdown of two key store-operated Ca2+ entry (SOCE) components, Orai1 and STIM1, did not reduce Tg cytotoxicity, indicating that SOCE and Ca2+ entry are not critical for Tg-induced cell death. However, we observed a correlation between the abilities of Tg and Tg analogs to deplete ER Ca2+ stores and their detrimental effects on cell viability. Furthermore, caspase activation and cell death were associated with a sustained unfolded protein response. We conclude that ER Ca2+ drainage and sustained unfolded protein response activation are key for initiation of apoptosis at low concentrations of Tg and Tg analogs, whereas high cytosolic Ca2+ levels and SOCE are not required.
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Affiliation(s)
- Pankaj Sehgal
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark.,Biology Platform, Sunnybrook Research Institute, and Department of Biochemistry, University of Toronto, Toronto, Ontario M4N 3M5, Canada.,Centre for Membrane Pumps in Cells and Disease (Pumpkin), Danish Research Foundation, DK-8000 Aarhus, Denmark
| | - Paula Szalai
- Centre for Molecular Medicine Norway (NCMM), Nordic European Molecular Biology Laboratory (EMBL) Partnership for Molecular Medicine, University of Oslo, P. O. Box 1137 Blindern, 0318 Oslo, Norway
| | - Claus Olesen
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark.,Centre for Membrane Pumps in Cells and Disease (Pumpkin), Danish Research Foundation, DK-8000 Aarhus, Denmark
| | - Helle A Praetorius
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark
| | - Poul Nissen
- Centre for Membrane Pumps in Cells and Disease (Pumpkin), Danish Research Foundation, DK-8000 Aarhus, Denmark.,Danish Research Institute of Translational Neuroscience (DANDRITE), Nordic EMBL Partnership for Molecular Medicine, Department of Molecular Biology and Genetics, DK-8000 Aarhus, Denmark, and
| | | | - Nikolai Engedal
- Centre for Molecular Medicine Norway (NCMM), Nordic European Molecular Biology Laboratory (EMBL) Partnership for Molecular Medicine, University of Oslo, P. O. Box 1137 Blindern, 0318 Oslo, Norway,
| | - Jesper V Møller
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark, .,Centre for Membrane Pumps in Cells and Disease (Pumpkin), Danish Research Foundation, DK-8000 Aarhus, Denmark
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28
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Zhao D, Liu Y, Liu X, Li T, Xin Z, Zhu X, Wu X, Liu Y. HBV suppresses thapsigargin-induced apoptosis via inhibiting CHOP expression in hepatocellular carcinoma cells. Oncol Lett 2017; 14:4403-4409. [PMID: 28943956 DOI: 10.3892/ol.2017.6666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 07/21/2017] [Indexed: 12/21/2022] Open
Abstract
Hepatocellular carcinoma (HCC) accounts for a proportion of cancer-associated mortalities worldwide. Hepatitis B virus (HBV) infection is a major cause of HCC in China. Thapsigargin (TG) is a potential antitumor prodrug, eliciting endoplasmic reticulum (ER) stress via the inhibition of the ER calcium pump, effectively inducing apoptosis. The present study therefore examined the role of HBV in TG-induced apoptosis using two HCC cell lines, HBV positive HepG2.2.15 and HBV negative HepG2. When these two cell lines were treated with TG, HepG2.2.15 was less susceptible to apoptosis than HepG2. This phenomenon was confirmed by an MTT assay and Annexin V-FITC/propidium iodide staining. Reverse transcription quantitative polymerase chain reaction and western blotting were used to detect the expression levels of genes in the ER stress pathway subsequent to treatment with TG. Notably, the mRNA and protein levels of the apoptosis factor DNA damage inducible transcript 3 (CHOP) increased significantly in the HepG2 cells compared with the HepG2.2.15 cells. Additionally, the HepG2.2.15 cells treated with interferon-α exhibited higher levels of CHOP compared with the untreated cells. The overexpression or knockdown of CHOP microRNA in HepG2.2.15 or HepG2 cells may reduce the difference in apoptosis status between the two cell lines. These results suggest that HBV may inhibit the apoptosis induced by ER stress. These findings may be useful in the development of selective therapies for patients with HBV-positive tumors.
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Affiliation(s)
- Danqi Zhao
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing 100005, P.R. China
| | - Yan Liu
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing 100005, P.R. China
| | - Xing Liu
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing 100005, P.R. China
| | - Tao Li
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing 100005, P.R. China
| | - Zhenhui Xin
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing 100005, P.R. China
| | - Xilin Zhu
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing 100005, P.R. China
| | - Xiaopan Wu
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing 100005, P.R. China
| | - Ying Liu
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing 100005, P.R. China
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29
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De Loof A. Calcitox-aging counterbalanced by endogenous farnesol-like sesquiterpenoids: An undervalued evolutionarily ancient key signaling pathway. Commun Integr Biol 2017; 10:e1341024. [PMID: 28919940 PMCID: PMC5595427 DOI: 10.1080/19420889.2017.1341024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 06/07/2017] [Indexed: 02/08/2023] Open
Abstract
Cells are powerful miniature electrophoresis chambers, at least during part of their life cycle. They die at the moment the voltage gradient over their plasma membrane, and their ability to drive a self-generated electric current carried by inorganic ions through themselves irreversibly collapses. Senescence is likely due to the progressive, multifactorial damage to the cell's electrical system. This is the essence of the "Fading electricity theory of aging" (De Loof et al., Aging Res. Rev. 2013;12:58-66). "Biologic electric current" is not carried by electrons, but by inorganic ions. The major ones are H+, Na+, K+, Ca2+, Mg2+, Cl- and HCO3-. Ca2+ and H+ in particular are toxic to cells. At rising concentrations, they can alter the 3D-conformation of chromatin and some (e.g. cytoskeletal) proteins: Calcitox and Protontox. This paper only focuses on Calcitox and endogenous sesquiterpenoids. pH-control and Ca2+-homeostasis have been shaped to near perfection during billions of years of evolution. The role of Ca2+ in some aspects of aging, e.g., as causal to neurodegenerative diseases is still debated. The main anti-Calcitox mechanism is to keep free cytoplasmic Ca2+ as low as possible. This can be achieved by restricting the passive influx of Ca2+ through channels in the plasma membrane, and by maximizing the active extrusion of excess Ca2+ e.g., by means of different types of Ca2+-ATPases. Like there are mechanisms that antagonize the toxic effects of Reactive Oxygen Species (ROS), there must also exist endogenous tools to counteract Calcitox. During a re-evaluation of which mechanism(s) exactly initiates the fast aging that accompanies induction of metamorphosis in insects, a causal relationship between absence of an endogenous sesquiterpenoid, namely the farnesol ester named "juvenile hormone," and disturbed Ca2+-homeostasis was suggested. In this paper, this line of thinking is further explored and extended to vertebrate physiology. A novel concept emerges: horseshoe-shaped sesquiterpenoids seem to act as "inbrome" agonists with the function of a "chemical valve" or "spring" in some types of multi-helix transmembrane proteins (intramolecular prenylation), from bacterial rhodopsins to some types of GPCRs and ion pumps, in particular the SERCA-Ca2+-pump. This further underpins the Fading Electricity Theory of Aging.
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Affiliation(s)
- Arnold De Loof
- Functional Genomics and Proteomics Group, Department of Biology, KU Leuven-University of Leuven, Leuven, Belgium
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30
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Takahashi N, Kimura AP, Naito S, Yoshida M, Kumano O, Suzuki T, Itaya S, Moriya M, Tsuji M, Ieko M. Sarcolipin expression is repressed by endoplasmic reticulum stress in C2C12 myotubes. J Physiol Biochem 2017; 73:531-538. [DOI: 10.1007/s13105-017-0578-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 06/29/2017] [Indexed: 01/08/2023]
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31
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Mahalingam D, Wilding G, Denmeade S, Sarantopoulas J, Cosgrove D, Cetnar J, Azad N, Bruce J, Kurman M, Allgood VE, Carducci M. Mipsagargin, a novel thapsigargin-based PSMA-activated prodrug: results of a first-in-man phase I clinical trial in patients with refractory, advanced or metastatic solid tumours. Br J Cancer 2017; 114:986-94. [PMID: 27115568 PMCID: PMC4984914 DOI: 10.1038/bjc.2016.72] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 02/03/2016] [Accepted: 02/16/2016] [Indexed: 12/26/2022] Open
Abstract
Background: Mipsagargin (G-202; (8-O-(12-aminododecanoyl)-8-O-debutanoyl thapsigargin)-Asp-γ-Glu-γ-Glu-γ-GluGluOH)) is a novel thapsigargin-based targeted prodrug that is activated by PSMA-mediated cleavage of an inert masking peptide. The active moiety is an inhibitor of the sarcoplasmic/endoplasmic reticulum calcium adenosine triphosphatase (SERCA) pump protein that is necessary for cellular viability. We evaluated the safety of mipsagargin in patients with advanced solid tumours and established a recommended phase II dosing (RP2D) regimen. Methods: Patients with advanced solid tumours received mipsagargin by intravenous infusion on days 1, 2 and 3 of 28-day cycles and were allowed to continue participation in the absence of disease progression or unacceptable toxicity. The dosing began at 1.2 mg m−2 and was escalated using a modified Fibonacci schema to determine maximally tolerated dose (MTD) with an expansion cohort at the RP2D. Plasma was analysed for mipsagargin pharmacokinetics and response was assessed using RECIST criteria. Results: A total of 44 patients were treated at doses ranging from 1.2 to 88 mg m−2, including 28 patients in the dose escalation phase and 16 patients in an expansion cohort. One dose-limiting toxicity (DLT; Grade 3 rash) was observed in the dose escalation portion of the study. At 88 mg m−2, observations of Grade 2 infusion-related reaction (IRR, 2 patients) and Grade 2 creatinine elevation (1 patient) led to declaration of 66.8 mg m−2 as the recommended phase II dose (RP2D). Across the study, the most common treatment-related adverse events (AEs) were fatigue, rash, nausea, pyrexia and IRR. Two patients developed treatment-related Grade 3 acute renal failure that was reversible during the treatment-free portion of the cycle. To help ameliorate the IRR and creatinine elevations, a RP2D of 40 mg m−2 on day 1 and 66.8 mg m−2 on days 2 and 3 with prophylactic premedications and hydration on each day of infusion was established. Clinical response was not observed, but prolonged disease stabilisation was observed in a subset of patients. Conclusions: Mipsagargin demonstrated an acceptable tolerability and favourable pharmacokinetic profile in patients with solid tumours.
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Affiliation(s)
- D Mahalingam
- University of Texas Health Science Center San Antonio, Cancer Therapy and Research Center, 7979 Wurzbach Road, U639, Mail Code 8232, San Antonio, TX 78229, USA
| | - G Wilding
- University of Wisconsin Comprehensive Cancer Center, Madison, WI, USA
| | - S Denmeade
- Johns Hopkins University, Baltimore, MD, USA
| | - J Sarantopoulas
- University of Texas Health Science Center San Antonio, Cancer Therapy and Research Center, 7979 Wurzbach Road, U639, Mail Code 8232, San Antonio, TX 78229, USA
| | - D Cosgrove
- Johns Hopkins University School of Medicine, Sidney Kimmel Comprehensive Cancer Center, Bunting/Blaustein Building, 1650 Orleans Street, Baltimore, MD 21231-1000, USA
| | - J Cetnar
- University of Wisconsin Comprehensive Cancer Center, Madison, WI, USA
| | - N Azad
- Johns Hopkins University School of Medicine, Sidney Kimmel Comprehensive Cancer Center, Bunting/Blaustein Building, 1650 Orleans Street, Baltimore, MD 21231-1000, USA
| | - J Bruce
- Department of Oncology, University of Wisconsin Carbone Cancer Center, 7057 Wisconsin Institutes for Medical Research, 1111 Highland Avenue, Madison, WI 53705, USA
| | - M Kurman
- Genspera Inc., Medical Monitor, 2511 North Loop 1604 W, Suite 204, San Antonio, TX 78258, USA
| | - V E Allgood
- Genspera Inc., Medical Monitor, 2511 North Loop 1604 W, Suite 204, San Antonio, TX 78258, USA
| | - M Carducci
- Johns Hopkins University School of Medicine, Sidney Kimmel Comprehensive Cancer Center, Bunting/Blaustein Building, 1650 Orleans Street, Baltimore, MD 21231-1000, USA
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32
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Tejral G, Sopko B, Necas A, Schoner W, Amler E. Computer modelling reveals new conformers of the ATP binding loop of Na +/K +-ATPase involved in the transphosphorylation process of the sodium pump. PeerJ 2017; 5:e3087. [PMID: 28316890 PMCID: PMC5354106 DOI: 10.7717/peerj.3087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 02/14/2017] [Indexed: 01/02/2023] Open
Abstract
Hydrolysis of ATP by Na+/K+-ATPase, a P-Type ATPase, catalyzing active Na+ and K+ transport through cellular membranes leads transiently to a phosphorylation of its catalytical α-subunit. Surprisingly, three-dimensional molecular structure analysis of P-type ATPases reveals that binding of ATP to the N-domain connected by a hinge to the P-domain is much too far away from the Asp369 to allow the transfer of ATP’s terminal phosphate to its aspartyl-phosphorylation site. In order to get information for how the transfer of the γ-phosphate group of ATP to the Asp369 is achieved, analogous molecular modeling of the M4–M5 loop of ATPase was performed using the crystal data of Na+/K+-ATPase of different species. Analogous molecular modeling of the cytoplasmic loop between Thr338 and Ile760 of the α2-subunit of Na+/K+-ATPase and the analysis of distances between the ATP binding site and phosphorylation site revealed the existence of two ATP binding sites in the open conformation; the first one close to Phe475 in the N-domain, the other one close to Asp369 in the P-domain. However, binding of Mg2+•ATP to any of these sites in the “open conformation” may not lead to phosphorylation of Asp369. Additional conformations of the cytoplasmic loop were found wobbling between “open conformation” <==> “semi-open conformation <==> “closed conformation” in the absence of 2Mg2+•ATP. The cytoplasmic loop’s conformational change to the “semi-open conformation”—characterized by a hydrogen bond between Arg543 and Asp611—triggers by binding of 2Mg2+•ATP to a single ATP site and conversion to the “closed conformation” the phosphorylation of Asp369 in the P-domain, and hence the start of Na+/K+-activated ATP hydrolysis.
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Affiliation(s)
- Gracian Tejral
- Department of Biophysics, 2nd Faculty of Medicine, Charles University Prague, Prague, Czech Republic; Laboratory of Tissue Engineering, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Bruno Sopko
- Department of Medical Chemistry and Clinical Biochemistry, 2nd Faculty of Medicine, Charles University Prague , Prague , Czech Republic
| | - Alois Necas
- Small Animal Clinic, Faculty of Veterinary Medicine, University of Veterinary and Pharmaceutical Science , Brno , Czech Republic
| | - Wilhelm Schoner
- Institute of Biochemistry and Endocrinology, University of Giessen , Giessen , Germany
| | - Evzen Amler
- Department of Biophysics, 2nd Faculty of Medicine, Charles University Prague, Prague, Czech Republic; Laboratory of Tissue Engineering, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Chen J, De Raeymaecker J, Hovgaard JB, Smaardijk S, Vandecaetsbeek I, Wuytack F, Møller JV, Eggermont J, De Maeyer M, Christensen SB, Vangheluwe P. Structure/activity relationship of thapsigargin inhibition on the purified Golgi/secretory pathway Ca 2+/Mn 2+-transport ATPase (SPCA1a). J Biol Chem 2017; 292:6938-6951. [PMID: 28264934 DOI: 10.1074/jbc.m117.778431] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 03/02/2017] [Indexed: 12/11/2022] Open
Abstract
The Golgi/secretory pathway Ca2+/Mn2+-transport ATPase (SPCA1a) is implicated in breast cancer and Hailey-Hailey disease. Here, we purified recombinant human SPCA1a from Saccharomyces cerevisiae and measured Ca2+-dependent ATPase activity following reconstitution in proteoliposomes. The purified SPCA1a displays a higher apparent Ca2+ affinity and a lower maximal turnover rate than the purified sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA1a). The lipids cholesteryl hemisuccinate, linoleamide/oleamide, and phosphatidylethanolamine inhibit and phosphatidic acid and sphingomyelin enhance SPCA1a activity. Moreover, SPCA1a is blocked by micromolar concentrations of the commonly used SERCA1a inhibitors thapsigargin (Tg), cyclopiazonic acid, and 2,5-di-tert-butylhydroquinone. Because tissue-specific targeting of SERCA2b by Tg analogues is considered for prostate cancer therapy, the inhibition of SPCA1a by Tg might represent an off-target risk. We assessed the structure-activity relationship (SAR) of Tg for SPCA1a by in silico modeling, site-directed mutagenesis, and measuring the potency of a series of Tg analogues. These indicate that Tg and the analogues are bound via the Tg scaffold but with lower affinity to the same homologous cavity as on the membrane surface of SERCA1a. The lower Tg affinity may depend on a more flexible binding cavity in SPCA1a, with low contributions of the Tg O-3, O-8, and O-10 chains to the binding energy. Conversely, the protein interaction of the Tg O-2 side chain with SPCA1a appears comparable with that of SERCA1a. These differences define a SAR of Tg for SPCA1a distinct from that of SERCA1a, indicating that Tg analogues with a higher specificity for SPCA1a can probably be developed.
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Affiliation(s)
- Jialin Chen
- From the Laboratory of Cellular Transport Systems, Department of Cellular and Molecular Medicine, and
| | - Joren De Raeymaecker
- Biochemistry, Molecular and Structural Biology Section, Department of Chemistry, KU Leuven, 3000 Leuven, Belgium
| | - Jannik Brøndsted Hovgaard
- the Department of Drug Design and Pharmacology, University of Copenhagen, DK-2100 Copenhagen, Denmark, and
| | - Susanne Smaardijk
- From the Laboratory of Cellular Transport Systems, Department of Cellular and Molecular Medicine, and
| | - Ilse Vandecaetsbeek
- From the Laboratory of Cellular Transport Systems, Department of Cellular and Molecular Medicine, and
| | - Frank Wuytack
- From the Laboratory of Cellular Transport Systems, Department of Cellular and Molecular Medicine, and
| | | | - Jan Eggermont
- From the Laboratory of Cellular Transport Systems, Department of Cellular and Molecular Medicine, and
| | - Marc De Maeyer
- Biochemistry, Molecular and Structural Biology Section, Department of Chemistry, KU Leuven, 3000 Leuven, Belgium
| | - Søren Brøgger Christensen
- the Department of Drug Design and Pharmacology, University of Copenhagen, DK-2100 Copenhagen, Denmark, and
| | - Peter Vangheluwe
- From the Laboratory of Cellular Transport Systems, Department of Cellular and Molecular Medicine, and
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Huml L, Jurášek M, Mikšátková P, Zimmermann T, Tomanová P, Buděšínský M, Rottnerová Z, Šimková M, Harmatha J, Kmoníčková E, Lapčík O, Drašar PB. Immunoassay for determination of trilobolide. Steroids 2017; 117:105-111. [PMID: 27600788 DOI: 10.1016/j.steroids.2016.08.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 08/10/2016] [Accepted: 08/30/2016] [Indexed: 11/27/2022]
Abstract
Trilobolide (Tb) is a pharmacologically interesting sesquiterpene lactone isolated from Laser trilobum (L.) Borkh. Structural relation to a sarco/endoplasmic reticulum Ca2+-ATPase inhibitor thapsigargin bring promising prospects for Tb to be used in the development of new anti-cancer drugs. As long as there are still unanswered questions regarding its investigation, a need for novel analytical tools emerge. Since immunoassays serve as one of powerful tools within the investigation of natural products, the development of indirect competitive enzyme-linked immunosorbent assay (ELISA) utilizing coating based on avidin-biotin technology is described. In our set-up of ELISA, newly synthesized biotinylated Tb served as immobilized competitor. Tb-carboxymethyloxime-bovine serum albumin (BSA) and Tb-succinoyl-BSA conjugates were used separately for immunization of rabbits. Two sets of polyclonal antibodies (RAbs) were obtained. Antibodies against Tb-succinoyl-BSA conjugate (RAb No. 206) were chosen as the best. Under optimized conditions, limit of detection and 50% intercept of our ELISA were 849pg/mL and 8.89ng/mL, respectively. The cross-reactivity (CR) was tested on 10 structurally related compounds and CR did not exceed 6.1%. The reproducibility of the system is expressed as intra- and inter-assay coefficients of variation (9.7% and 11.4%, respectively). Based on conducted experiments, we proposed the use of ELISA for quantification of Tb in complex biological matrices such as plant extracts. A method was applied to analyze three extracts obtained from different parts of L. trilobum. Data obtained were compared to those acquired by UHPLC-MS/MS. The concordance between the methods (103-87%) showed the ability of ELISA to quantify Tb.
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Affiliation(s)
- Lukáš Huml
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic
| | - Michal Jurášek
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic
| | - Petra Mikšátková
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic
| | - Tomáš Zimmermann
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic
| | - Pavla Tomanová
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry, CZ-166 10 Prague, Czech Republic
| | - Zdeňka Rottnerová
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic
| | - Markéta Šimková
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic
| | - Juraj Harmatha
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic; Institute of Organic Chemistry and Biochemistry, CZ-166 10 Prague, Czech Republic
| | - Eva Kmoníčková
- Institute of Experimental Medicine, AS CR, v.v.i., CZ-142 20 Prague, Czech Republic; Charles University in Prague, Faculty of Medicine and Biomedical Center in Pilsen, CZ-301 66 Pilsen, Czech Republic
| | - Oldřich Lapčík
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic.
| | - Pavel B Drašar
- University of Chemistry and Technology Prague, Faculty of Food and Biochemical Technology [342], CZ-166 28 Prague, Czech Republic.
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Small molecule RL71 targets SERCA2 at a novel site in the treatment of human colorectal cancer. Oncotarget 2016; 6:37613-25. [PMID: 26608678 PMCID: PMC4741952 DOI: 10.18632/oncotarget.6068] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Accepted: 09/26/2015] [Indexed: 12/14/2022] Open
Abstract
While targeted agents are an important part of the treatment arsenal for colorectal cancer, there is still a lack of efficient small-molecule targeted agents based on the understanding of pathogenic molecular mechanisms. In this study, curcumin analog RL71 displayed potent cytotoxicity towards human colon cancer cells with an IC50 of 0.8 μM in SW480 cells and inhibited xenotransplanted tumor growth in a dose-dependent manner. Using affinity chromatography, we identified sarco/endoplasmic reticulum calcium-ATPase (SERCA) 2 as the binding target of RL71. Most notably, RL71 demonstrated special binding to SERCA2 at a novel site with the lowest estimated free energy −8.89 kcal mol−1, and the SERCA2 residues critical for RL71 binding were identified. RL71 suppressed the Ca2+-ATPase activity of SERCA2 both in vitro and in vivo, accompanied by the induction of endoplasmic reticulum stress leading to apoptosis and G2/M cycle arrest in SW480 cells. In addition, RL71 showed synergistic cytotoxicity with the pan-SERCA inhibitor thapsigargin. These results suggest that RL71 could be a selective small-molecule inhibitor of SERCA2, and that it may serve as a lead compound for the study of targeted colorectal cancer therapy.
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Montagnani Marelli M, Marzagalli M, Moretti RM, Beretta G, Casati L, Comitato R, Gravina GL, Festuccia C, Limonta P. Vitamin E δ-tocotrienol triggers endoplasmic reticulum stress-mediated apoptosis in human melanoma cells. Sci Rep 2016; 6:30502. [PMID: 27461002 PMCID: PMC4996065 DOI: 10.1038/srep30502] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 07/06/2016] [Indexed: 12/13/2022] Open
Abstract
Malignant melanoma is the leading cause of death from skin cancer. Drug toxicity and resistance represent a serious challange for melanoma treatments. Evidence demonstrates that natural compounds may play a crucial role in cancer prevention, growth and progression. Vitamin E tocotrienols (TT) were shown to possess antitumor activity. Here, we analyzed the effects of δ-TT on melanoma cell growth and the involvement of the endoplasmic reticulum (ER) stress in this activity. The experiments were performed on human melanoma cell lines, BLM and A375. δ-TT exerted a significant proapoptotic effect on both cell lines, involving the intrinsic apoptosis pathway; importantly, this compound did not affect the viability of normal human melanocytes. In melanoma cells, δ-TT exerted its antitumor effect through activation of the PERK/p-eIF2α/ATF4/CHOP, IRE1α and caspase-4 ER stress-related branches. Salubrinal, an inhibitor of the ER stress, counteracted the cytotoxic activity of δ-TT. In vivo experiments performed in nude mice bearing A375 xenografts evidenced that δ-TT reduces tumor volume and tumor mass; importantly, tumor progression was significantly delayed by δ-TT treatment. In conclusion, δ-TT exerts a proapoptotic activity on melanoma cells, through activation of the ER stress-related pathways. δ-TT might represent an effective option for novel chemopreventive/therapeutic strategies for melanoma.
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Affiliation(s)
- Marina Montagnani Marelli
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milano, 20133, Italy
| | - Monica Marzagalli
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milano, 20133, Italy
| | - Roberta M. Moretti
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milano, 20133, Italy
| | - Giangiacomo Beretta
- Department of Pharmaceutical Sciences, Università degli Studi di Milano, Milano, 20133, Italy
| | - Lavinia Casati
- Department of Medical Biotechnologies and Translational Medicine, Università degli Studi di Milano, Milano, 20129, Italy
| | - Raffaella Comitato
- Council for Agricultural Research and Economics, Food and Nutrition Research Centre, Roma, 00178, Italy
| | - Giovanni L. Gravina
- Department of Applied and Biotechnological Clinical Sciences, Università degli Studi dell’Aquila, L’Aquila, 67100, Italy
| | - Claudio Festuccia
- Department of Applied and Biotechnological Clinical Sciences, Università degli Studi dell’Aquila, L’Aquila, 67100, Italy
| | - Patrizia Limonta
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milano, 20133, Italy
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Karlsen JL, Bublitz M. How to Compare, Analyze, and Morph Between Crystal Structures of Different Conformations: The P-Type ATPase Example. Methods Mol Biol 2016; 1377:523-39. [PMID: 26695058 DOI: 10.1007/978-1-4939-3179-8_43] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In the past 15 years, a large body of structural information on P-type ATPases has accumulated in the Protein Data Bank. The available crystal structures cover different enzymes in a variety of conformational states that are associated with the enzymatic activity of ATP-dependent ion translocation across membranes. This chapter provides an overview about the available structural information, along with some practical instructions on how to make meaningful comparisons of structures in different conformations, and how to generate morphs between series of structures, in order to analyze domain movements and structural flexibility.
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Affiliation(s)
- Jesper L Karlsen
- Department of Molecular Biology and Genetics, Aarhus University, Gustav Wieds Vej 10c, Aarhus C, 8000, Denmark.
| | - Maike Bublitz
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK
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Pérez-Gordones M, Serrano M, Rojas H, Martínez J, Uzcanga G, Mendoza M. Presence of a thapsigargin-sensitive calcium pump in Trypanosoma evansi: Immunological, physiological, molecular and structural evidences. Exp Parasitol 2015; 159:107-17. [DOI: 10.1016/j.exppara.2015.08.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 07/28/2015] [Accepted: 08/16/2015] [Indexed: 10/23/2022]
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Dubois C, Prevarskaya N, Vanden Abeele F. The calcium-signaling toolkit: Updates needed. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1863:1337-43. [PMID: 26658643 DOI: 10.1016/j.bbamcr.2015.11.033] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 11/06/2015] [Accepted: 11/15/2015] [Indexed: 12/21/2022]
Abstract
Here, we review the role of Ca(2+) in apoptosis, namely that ER Ca(2+) depletion or a sustained elevation of cytosolic or mitochondrial Ca(2+) concentration are sufficient to trigger apoptosis. These concepts have emerged by the use of ER stressor agents that decrease the ER Ca(2+) pool by inhibiting SERCA pumps. However, aside from their well-known actions on Ca(2+) homeostasis disruption leading to apoptosis, new evidence show that some ER Ca(2+) modulators have significant implications in other Ca(2+)-mediated or Ca(2+)-independent pathways determining cell fate suggesting a more complex regulation of apoptosis by intracellular Ca(2+). Here, we discuss the crucial interplay between Ca(2+) mediated apoptosis, the Unfold Protein Response and autophagy determining cell fate, and the molecular compounds that have been used to depict these pathways. This review of the literature clearly shows the need for new inhibitors that do not interfere concomitantly with autophagy and Ca(2+) signaling. This article is part of a Special Issue entitled: Calcium and Cell Fate. Guest Editors: Jacques Haiech, Claus Heizmann, Joachim Krebs, Thierry Capiod and Olivier Mignen.
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Affiliation(s)
- Charlotte Dubois
- Inserm U1003, Equipe labellisée par la Ligue Nationale Contre le Cancer, SIRIC ONCOLille, Université des Sciences et Technologies de Lille (USTL), Villeneuve d'Ascq, 59650 France, Laboratory of Excellence, Ion Channels Science and Therapeutics, France
| | - Natalia Prevarskaya
- Inserm U1003, Equipe labellisée par la Ligue Nationale Contre le Cancer, SIRIC ONCOLille, Université des Sciences et Technologies de Lille (USTL), Villeneuve d'Ascq, 59650 France, Laboratory of Excellence, Ion Channels Science and Therapeutics, France
| | - Fabien Vanden Abeele
- Inserm U1003, Equipe labellisée par la Ligue Nationale Contre le Cancer, SIRIC ONCOLille, Université des Sciences et Technologies de Lille (USTL), Villeneuve d'Ascq, 59650 France, Laboratory of Excellence, Ion Channels Science and Therapeutics, France
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Autzen HE, Siuda I, Sonntag Y, Nissen P, Møller JV, Thøgersen L. Regulation of the Ca(2+)-ATPase by cholesterol: a specific or non-specific effect? Mol Membr Biol 2015; 32:75-87. [PMID: 26260074 DOI: 10.3109/09687688.2015.1073382] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Like other integral membrane proteins, the activity of the Sarco/Endoplasmic Reticulum Ca(2+)-ATPase (SERCA) is regulated by the membrane environment. Cholesterol is present in the endoplasmic reticulum membrane at low levels, and it has the potential to affect SERCA activity both through direct, specific interaction with the protein or through indirect interaction through changes of the overall membrane properties. There are experimental data arguing for both modes of action for a cholesterol-mediated regulation of SERCA. In the current study, coarse-grained molecular dynamics simulations are used to address how a mixed lipid-cholesterol membrane interacts with SERCA. Candidates for direct regulatory sites with specific cholesterol binding modes are extracted from the simulations. The binding pocket for thapsigargin, a nanomolar inhibitor of SERCA, has been suggested as a cholesterol binding site. However, the thapsigargin binding pocket displayed very little cholesterol occupation in the simulations. Neither did atomistic simulations of cholesterol in the thapsigargin binding pocket support any specific interaction. The current study points to a non-specific effect of cholesterol on SERCA activity, and offers an alternative interpretation of the experimental results used to argue for a specific effect.
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Affiliation(s)
- Henriette Elisabeth Autzen
- a Centre for Membrane Pumps in Cells and Disease (PUMPkin), Danish National Research Foundation , Aarhus , Denmark .,b Department of Molecular Biology and Genetics , Aarhus University , Aarhus , Denmark
| | - Iwona Siuda
- a Centre for Membrane Pumps in Cells and Disease (PUMPkin), Danish National Research Foundation , Aarhus , Denmark .,c Bioinformatics Research Centre (BiRC) , Aarhus , Denmark , and
| | - Yonathan Sonntag
- a Centre for Membrane Pumps in Cells and Disease (PUMPkin), Danish National Research Foundation , Aarhus , Denmark .,b Department of Molecular Biology and Genetics , Aarhus University , Aarhus , Denmark
| | - Poul Nissen
- a Centre for Membrane Pumps in Cells and Disease (PUMPkin), Danish National Research Foundation , Aarhus , Denmark .,b Department of Molecular Biology and Genetics , Aarhus University , Aarhus , Denmark
| | - Jesper Vuust Møller
- a Centre for Membrane Pumps in Cells and Disease (PUMPkin), Danish National Research Foundation , Aarhus , Denmark .,d Department of Biomedicine , Aarhus University , Aarhus , Denmark
| | - Lea Thøgersen
- a Centre for Membrane Pumps in Cells and Disease (PUMPkin), Danish National Research Foundation , Aarhus , Denmark .,c Bioinformatics Research Centre (BiRC) , Aarhus , Denmark , and
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Pereira DM, Valentão P, Correia-da-Silva G, Teixeira N, Andrade PB. Translating endoplasmic reticulum biology into the clinic: a role for ER-targeted natural products? Nat Prod Rep 2015; 32:705-22. [PMID: 25703279 DOI: 10.1039/c4np00102h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
ER stress has been identified as a hallmark, and sometimes trigger, of several pathologies, notably cancer, inflammation and neurodegenerative diseases like Alzheimer's and Parkinson's. Among the molecules described in literature known to affect ER function, the majority are natural products, suggesting that natural molecules may constitute a significant arsenal of chemical entities for modulating this cellular target. In this review, we will start by presenting the current knowledge of ER biology and the hallmarks of ER stress, thus paving the way for presenting the natural products that have been described as being ER modulators, either stress inducers or ER protectors. The chemistry, distribution and mechanism of action of these compounds will be presented and discussed.
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Affiliation(s)
- David M Pereira
- REQUIMTE/LAQV, Laboratório de Farmacognosia, Departamento de Química, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, no. 228, 4050-313 Porto, Portugal.
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De Ford C, Calderón C, Sehgal P, Fedosova NU, Murillo R, Olesen C, Nissen P, Møller JV, Merfort I. Discovery of Tricyclic Clerodane Diterpenes as Sarco/Endoplasmic Reticulum Ca(2+)-ATPase Inhibitors and Structure-Activity Relationships. JOURNAL OF NATURAL PRODUCTS 2015; 78:1262-1270. [PMID: 25993619 DOI: 10.1021/acs.jnatprod.5b00062] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Tricyclic clerodane diterpenes (TCDs) are natural compounds that often show potent cytotoxicity for cancer cells, but their mode of action remains elusive. A computationally based similarity search (CDRUG), combined with principal component analysis (ChemGPS-NP) and docking calculations (GOLD 5.2), suggested TCDs to be inhibitors of the sarco/endoplasmic reticulum Ca(2+)-ATPase (SERCA) pump, which is also the target of the sesquiterpene lactone thapsigargin. Biochemical studies were performed with 11 TCDs on purified rabbit skeletal muscle sarcoplasmic reticulum membranes, which are highly enriched with the SERCA1a isoform. Casearborin D (2) exhibited the highest affinity, with a KD value of 2 μM and giving rise to complete inhibition of SERCA1a activity. Structure-activity relationships revealed that functionalization of two acyl side chains (R1 and R4) and the hydrophobicity imparted by the aliphatic chain at C-9, as well as a C-3,C-4 double bond, play crucial roles for inhibitory activity. Docking studies also suggested that hydrophobic interactions in the binding site, especially with Phe256 and Phe834, may be important for a strong inhibitory activity of the TCDs. In conclusion, a novel class of SERCA inhibitory compounds is presented.
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Affiliation(s)
- Christian De Ford
- †Department of Pharmaceutical Biology and Biotechnology, Albert Ludwigs University Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany
- ‡Spemann Graduate School of Biology and Medicine (SGBM), Albert Ludwigs University Freiburg, Albertstrasse 19a, 79104 Freiburg, Germany
- §Faculty of Chemistry and Pharmacy, Albert Ludwigs University Freiburg, Albertstrasse 25, 79104 Freiburg, Germany
| | - Carlos Calderón
- #Escuela de Química and CIPRONA, Universidad de Costa Rica, 2060 San José, Costa Rica
| | - Pankaj Sehgal
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Natalya U Fedosova
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Renato Murillo
- #Escuela de Química and CIPRONA, Universidad de Costa Rica, 2060 San José, Costa Rica
| | - Claus Olesen
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Poul Nissen
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Jesper V Møller
- ∥Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark
- ⊥Centre for Membrane Pumps in Cells and Disease (PUMPkin), National Research Foundation, Aarhus, Denmark
| | - Irmgard Merfort
- †Department of Pharmaceutical Biology and Biotechnology, Albert Ludwigs University Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany
- ‡Spemann Graduate School of Biology and Medicine (SGBM), Albert Ludwigs University Freiburg, Albertstrasse 19a, 79104 Freiburg, Germany
- §Faculty of Chemistry and Pharmacy, Albert Ludwigs University Freiburg, Albertstrasse 25, 79104 Freiburg, Germany
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Doan NTQ, Crestey F, Olsen CE, Christensen SB. Chemo- and Regioselective Functionalization of Nortrilobolide: Application for Semisynthesis of the Natural Product 2-Acetoxytrilobolide. JOURNAL OF NATURAL PRODUCTS 2015; 78:1406-1414. [PMID: 26078214 DOI: 10.1021/acs.jnatprod.5b00333] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The difference in reactivity of the hexaoxygenated natural product thapsigargin (1) and the pentaoxygenated nortrilobolide (3) was compared in order to develop a chemo- and regioselective method for the conversion of nortrilobolide (3) into the natural product 2-acetoxytrilobolide (4). For the first time, a stereoselective synthesis of 2-acetoxytrilobolide (4) is described, which involves two key reactions: the first chemical step was a one-pot substitution-oxidation reaction of an allylic ester into its corresponding α,β-unsaturated ketone. The second process consisted of a stereoselective α'-acyloxylation of the key intermediate α,β-unsaturated ketone to afford its corresponding acetoxyketone, which was converted into 2-acetoxytrilobolide (4) in a few steps. This innovative approach would allow the synthesis of a broad library of novel and valuable penta- and hexaoxygenated guaianolides as potential anticancer agents.
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Affiliation(s)
- Nhu Thi Quynh Doan
- †Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen Ø, Denmark
| | - François Crestey
- †Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen Ø, Denmark
| | - Carl Erik Olsen
- ‡Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Søren Brøgger Christensen
- †Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen Ø, Denmark
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Tomanová P, Rimpelová S, Jurášek M, Buděšínský M, Vejvodová L, Ruml T, Kmoníčková E, Drašar PB. Trilobolide-porphyrin conjugates: on synthesis and biological effects evaluation. Steroids 2015; 97:8-12. [PMID: 25204594 DOI: 10.1016/j.steroids.2014.08.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Revised: 08/14/2014] [Accepted: 08/25/2014] [Indexed: 12/22/2022]
Abstract
Trilobolide (Tb), a potent natural counterpart of thapsigargin, is a sesquiterpene lactone of guaianolide type isolated from horse caraway (Laser trilobum, L. Borkh). Tb exerts remarkable pharmacological properties based on irreversible inhibition of sarco/endoplasmic reticulum calcium ATPase (SERCA), thus being of increasing interest for cancer cure. Additionally, another pharmacological activity of Tb, as well as of thapsigargin, was reported in several studies, Tb as being an effective inductor of nitric oxide and cytokine production. These extraordinary biological properties move these molecules in further pre-clinical evaluation. Because of ubiquitous character of SERCA expression, development of specifically targeted bioactive molecules is inevitable. Since it is well known that porphyrins are preferentially taken up by cancer cells, we have designed and synthesized novel Tb-porphyrin conjugates. Copper-catalyzed azide-alkyne cycloaddition was used to link Tb with porphyrin at once. Two model conjugates of Tb and porphyrin were synthesized and properly characterized. Employing naturally occurring fluorescence properties of porphyrins, we investigated the intracellular localization of the conjugates employing fluorescence microscopy in living cells. Intriguingly, the prepared conjugates localized both in mitochondria and lysosomes of HeLa and LNCaP cells. Furthermore, the cytotoxicity of Tb-porphyrin conjugates was assessed in a number of human cancer cell lines and rat peritoneal cells. Likewise in cancer cell lines, viability of rat peritoneal cells was not affected by the tested conjugates. Interestingly, we observed dose-dependent nitric oxide (iNOS) production induced by the tested conjugates. The effect was related to the type of a linker used and the overall size of the molecule. Another potent immunobiological effects are under evaluation. In summary, the results presented here indicate notable immunobiological potential of the prepared Tb conjugates. Moreover, they could help to decipher the molecular mechanism of Tb for its possible biomedical applications.
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Affiliation(s)
- Pavla Tomanová
- Department of Chemistry of Natural Compounds, Institute of Chemical Technology in Prague, CZ-16628 Prague, Czech Republic
| | - Silvie Rimpelová
- Department of Biochemistry and Microbiology, Institute of Chemical Technology in Prague, CZ-166 28 Prague, Czech Republic
| | - Michal Jurášek
- Department of Chemistry of Natural Compounds, Institute of Chemical Technology in Prague, CZ-16628 Prague, Czech Republic
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry, CZ-166 10 Prague, Czech Republic
| | - Lucie Vejvodová
- Institute of Pharmacology and Toxicology and Biomedical Centre, Faculty of Medicine in Pilsen, Charles University in Prague, CZ-301 66 Pilsen, Czech Republic
| | - Tomáš Ruml
- Department of Biochemistry and Microbiology, Institute of Chemical Technology in Prague, CZ-166 28 Prague, Czech Republic
| | - Eva Kmoníčková
- Institute of Pharmacology and Toxicology and Biomedical Centre, Faculty of Medicine in Pilsen, Charles University in Prague, CZ-301 66 Pilsen, Czech Republic.
| | - Pavel B Drašar
- Department of Chemistry of Natural Compounds, Institute of Chemical Technology in Prague, CZ-16628 Prague, Czech Republic.
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Doan NTQ, Paulsen ES, Sehgal P, Møller JV, Nissen P, Denmeade SR, Isaacs JT, Dionne CA, Christensen SB. Targeting thapsigargin towards tumors. Steroids 2015; 97:2-7. [PMID: 25065587 PMCID: PMC4696022 DOI: 10.1016/j.steroids.2014.07.009] [Citation(s) in RCA: 102] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 07/04/2014] [Accepted: 07/09/2014] [Indexed: 11/16/2022]
Abstract
The skin irritating principle from Thapsia garganica was isolated, named thapsigargin and the structure elucidated. By inhibiting the sarco/endoplasmic reticulum Ca(2+) ATPase (SERCA) thapsigargin provokes apoptosis in almost all cells. By conjugating thapsigargin to peptides, which are only substrates for either prostate specific antigen (PSA) or prostate specific membrane antigen (PSMA) prodrugs were created, which selectively affect prostate cancer cells or neovascular tissue in tumors. One of the prodrug is currently tested in clinical phase II. The prodrug under clinical trial has been named mipsagargin.
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Affiliation(s)
- Nhu Thi Quynh Doan
- Department of Drug Design and Pharmacology, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark
| | - Eleonora Sandholdt Paulsen
- Department of Drug Design and Pharmacology, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark
| | - Pankaj Sehgal
- Department of Biomedicine, Ole Worms Allé 6, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Jesper Vuust Møller
- Department of Biomedicine, Ole Worms Allé 6, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Poul Nissen
- Department of Molecular Biology and Genetics, Aarhus University, Gustav Wieds Vej 10, DK-8000 Aarhus C, Denmark
| | - Samuel R Denmeade
- The Bunting-Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD 21231, USA
| | - John T Isaacs
- The Bunting-Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD 21231, USA
| | - Craig A Dionne
- GenSpera, 2511 N Loop 1604 W, Suite 204, San Antonio, TX 78258, USA
| | - Søren Brøgger Christensen
- Department of Drug Design and Pharmacology, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark.
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P4-ATPases: lipid flippases in cell membranes. Pflugers Arch 2015; 466:1227-40. [PMID: 24077738 PMCID: PMC4062807 DOI: 10.1007/s00424-013-1363-4] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Revised: 09/11/2013] [Accepted: 09/11/2013] [Indexed: 12/13/2022]
Abstract
Cellular membranes, notably eukaryotic plasma membranes, are equipped with special proteins that actively translocate lipids from one leaflet to the other and thereby help generate membrane lipid asymmetry. Among these ATP-driven transporters, the P4 subfamily of P-type ATPases (P4-ATPases) comprises lipid flippases that catalyze the translocation of phospholipids from the exoplasmic to the cytosolic leaflet of cell membranes. While initially characterized as aminophospholipid translocases, recent studies of individual P4-ATPase family members from fungi, plants, and animals show that P4-ATPases differ in their substrate specificities and mediate transport of a broader range of lipid substrates, including lysophospholipids and synthetic alkylphospholipids. At the same time, the cellular processes known to be directly or indirectly affected by this class of transporters have expanded to include the regulation of membrane traffic, cytoskeletal dynamics, cell division, lipid metabolism, and lipid signaling. In this review, we will summarize the basic features of P4-ATPases and the physiological implications of their lipid transport activity in the cell.
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Habeck M, Haviv H, Katz A, Kapri-Pardes E, Ayciriex S, Shevchenko A, Ogawa H, Toyoshima C, Karlish SJD. Stimulation, inhibition, or stabilization of Na,K-ATPase caused by specific lipid interactions at distinct sites. J Biol Chem 2014; 290:4829-4842. [PMID: 25533463 DOI: 10.1074/jbc.m114.611384] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The activity of membrane proteins such as Na,K-ATPase depends strongly on the surrounding lipid environment. Interactions can be annular, depending on the physical properties of the membrane, or specific with lipids bound in pockets between transmembrane domains. This paper describes three specific lipid-protein interactions using purified recombinant Na,K-ATPase. (a) Thermal stability of the Na,K-ATPase depends crucially on a specific interaction with 18:0/18:1 phosphatidylserine (1-stearoyl-2-oleoyl-sn-glycero-3-phospho-L-serine; SOPS) and cholesterol, which strongly amplifies stabilization. We show here that cholesterol associates with SOPS, FXYD1, and the α subunit between trans-membrane segments αTM8 and -10 to stabilize the protein. (b) Polyunsaturated neutral lipids stimulate Na,K-ATPase turnover by >60%. A screen of the lipid specificity showed that 18:0/20:4 and 18:0/22:6 phosphatidylethanolamine (PE) are the optimal phospholipids for this effect. (c) Saturated phosphatidylcholine and sphingomyelin, but not saturated phosphatidylserine or PE, inhibit Na,K-ATPase activity by 70-80%. This effect depends strongly on the presence of cholesterol. Analysis of the Na,K-ATPase activity and E1-E2 conformational transitions reveals the kinetic mechanisms of these effects. Both stimulatory and inhibitory lipids poise the conformational equilibrium toward E2, but their detailed mechanisms of action are different. PE accelerates the rate of E1 → E2P but does not affect E2(2K)ATP → E13NaATP, whereas sphingomyelin inhibits the rate of E2(2K)ATP → E13NaATP, with very little effect on E1 → E2P. We discuss these lipid effects in relation to recent crystal structures of Na,K-ATPase and propose that there are three separate sites for the specific lipid interactions, with potential physiological roles to regulate activity and stability of the pump.
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Affiliation(s)
- Michael Habeck
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Haim Haviv
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Adriana Katz
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Einat Kapri-Pardes
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Sophie Ayciriex
- Max-Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany
| | - Andrej Shevchenko
- Max-Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany
| | - Haruo Ogawa
- Institute of Molecular and Cellular Biosciences, University of Tokyo, Tokyo 113-0032, Japan
| | - Chikashi Toyoshima
- Institute of Molecular and Cellular Biosciences, University of Tokyo, Tokyo 113-0032, Japan
| | - Steven J D Karlish
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel.
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49
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Jurášek M, Rimpelová S, Kmoníčková E, Drašar P, Ruml T. Tailor-made fluorescent trilobolide to study its biological relevance. J Med Chem 2014; 57:7947-54. [PMID: 25197766 DOI: 10.1021/jm500690j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Trilobolide (Tb) is a potent natural counterpart of thapsigargin, which has shown promising results in cancer clinical trials. Here, we report a rational approach to study intracellular localization and biological activity of this sesquiterpene lactone. We conjugated Tb with a green-emitting Bodipy dye attached by alternative linkers of different lengths. The live-cell imaging of the prepared bioconjugates brought clear evidence that Tb-Bodipy localized in the endoplasmic reticulum (ER) of various cancer cell lines. The localization signal was compared with ER-specific dyes. Cytotoxicity of Tb conjugates and impact on the mitochondrial physiology and nitric oxide release were also studied. The nitric oxide production and cytokine secretion in rat peritoneal cells indicate immunobiological potential of these lactone bioconjugates. In summary, our Tb-Bodipy conjugates could help us to reveal the molecular mechanism of trilobolide for its further potential use in biomedical applications.
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Affiliation(s)
- Michal Jurášek
- Institute of Chemical Technology in Prague , 16628 Prague, Czech Republic
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50
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Drachmann ND, Olesen C, Møller JV, Guo Z, Nissen P, Bublitz M. Comparing crystal structures of Ca(2+) -ATPase in the presence of different lipids. FEBS J 2014; 281:4249-62. [PMID: 25103814 DOI: 10.1111/febs.12957] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 08/03/2014] [Accepted: 08/04/2014] [Indexed: 12/01/2022]
Abstract
The activity of the sarco/endoplasmic reticulum Ca(2+) -ATPase (SERCA) depends strongly on the lipid composition of the surrounding membrane. Yet, structural information on SERCA-lipid interaction is still relatively scarce, and the influence of different lipids on the enzyme is not well understood. We have analyzed SERCA crystal structures in the presence of four different phosphatidylcholine lipids of different lengths and double-bond compositions, and we find three different binding sites for lipid head groups, which are apparently independent of the acyl moiety of the lipids used. By comparison with other available SERCA structures with bound lipids, we find a total of five recurring sites, two of which are specific to certain conformational states of the enzyme, two others are state-independent, and one is a crucial site for crystal formation. Three of the binding sites overlap with or are in close vicinity to known binding sites for various SERCA-specific inhibitors and regulators, e.g. thapsigargin, sarcolipin/phospholamban and cyclopiazonic acid. Whereas the transient sites are amenable to a transient, regulatory influence of lipid molecules, the state-independent sites probably provide a flexible anchoring of the protein in the fluid bilayer.
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Affiliation(s)
- Nikolaj D Drachmann
- Centre for Membrane Pumps in Cells and Disease - PUMPkin, Danish National Research Foundation, Aarhus, Denmark; Department of Molecular Biology and Genetics, Aarhus University, Denmark
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