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Höing L, Sowa ST, Toplak M, Reinhardt JK, Jakob R, Maier T, Lill MA, Teufel R. Biosynthesis of the bacterial antibiotic 3,7-dihydroxytropolone through enzymatic salvaging of catabolic shunt products. Chem Sci 2024; 15:7749-7756. [PMID: 38784727 PMCID: PMC11110157 DOI: 10.1039/d4sc01715c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Accepted: 04/21/2024] [Indexed: 05/25/2024] Open
Abstract
The non-benzenoid aromatic tropone ring is a structural motif of numerous microbial and plant natural products with potent bioactivities. In bacteria, tropone biosynthesis involves early steps of the widespread CoA-dependent phenylacetic acid (paa) catabolon, from which a shunt product is sequestered and surprisingly further utilized as a universal precursor for structurally and functionally diverse tropone derivatives such as tropodithietic acid or (hydroxy)tropolones. Here, we elucidate the biosynthesis of the antibiotic 3,7-dihydroxytropolone in Actinobacteria by in vitro pathway reconstitution using paa catabolic enzymes as well as dedicated downstream tailoring enzymes, including a thioesterase (TrlF) and two flavoprotein monooxygenases (TrlCD and TrlE). We furthermore mechanistically and structurally characterize the multifunctional key enzyme TrlE, which mediates an unanticipated ipso-substitution involving a hydroxylation and subsequent decarboxylation of the CoA-freed side chain, followed by ring oxidation to afford tropolone. This study showcases a remarkably efficient strategy for 3,7-dihydroxytropolone biosynthesis and illuminates the functions of the involved biosynthetic enzymes.
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Affiliation(s)
- Lars Höing
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel Klingelbergstrasse 50 4056 Basel Switzerland
| | - Sven T Sowa
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel Klingelbergstrasse 50 4056 Basel Switzerland
| | - Marina Toplak
- Hilde-Mangold-Haus (CIBSS), University of Freiburg Habsburgerstrasse 49 79104 Freiburg im Breisgau Germany
| | - Jakob K Reinhardt
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel Klingelbergstrasse 50 4056 Basel Switzerland
| | - Roman Jakob
- Biozentrum, University of Basel Spitalstrasse 41 4056 Basel Switzerland
| | - Timm Maier
- Biozentrum, University of Basel Spitalstrasse 41 4056 Basel Switzerland
| | - Markus A Lill
- Computational Pharmacy, Department of Pharmaceutical Sciences, University of Basel Klingelbergstrasse 50 4056 Basel Switzerland
| | - Robin Teufel
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel Klingelbergstrasse 50 4056 Basel Switzerland
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Haney SL, Feng D, Kollala SS, Chhonker YS, Varney ML, Williams JT, Ford JB, Murry DJ, Holstein SA. Investigation of the activity of a novel tropolone in osteosarcoma. Drug Dev Res 2024; 85:e22129. [PMID: 37961833 PMCID: PMC10922124 DOI: 10.1002/ddr.22129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 10/12/2023] [Accepted: 10/22/2023] [Indexed: 11/15/2023]
Abstract
Osteosarcoma (OS) is a primary malignant bone tumor characterized by frequent metastasis, rapid disease progression, and a high rate of mortality. Treatment options for OS have remained largely unchanged for decades, consisting primarily of cytotoxic chemotherapy and surgery, thus necessitating the urgent need for novel therapies. Tropolones are naturally occurring seven-membered non-benzenoid aromatic compounds that possess antiproliferative effects in a wide array of cancer cell types. MO-OH-Nap is an α-substituted tropolone that has activity as an iron chelator. Here, we demonstrate that MO-OH-Nap activates all three arms of the unfolded protein response (UPR) pathway and induces apoptosis in a panel of human OS cell lines. Co-incubation with ferric chloride or ammonium ferrous sulfate completely prevents the induction of apoptotic and UPR markers in MO-OH-Nap-treated OS cells. MO-OH-Nap upregulates transferrin receptor 1 (TFR1) protein levels, as well as TFR1, divalent metal transporter 1 (DMT1), iron-regulatory proteins (IRP1, IRP2), ferroportin (FPN), and zinc transporter 14 (ZIP14) transcript levels, demonstrating the impact of MO-OH-Nap on iron-homeostasis pathways in OS cells. Furthermore, MO-OH-Nap treatment restricts the migration and invasion of OS cells in vitro. Lastly, metabolomic profiling of MO-OH-Nap-treated OS cells revealed distinct changes in purine and pyrimidine metabolism. Collectively, we demonstrate that MO-OH-Nap-induced cytotoxic effects in OS cells are dependent on the tropolone's ability to alter cellular iron availability and that this agent exploits key metabolic pathways. These studies support further evaluation of MO-OH-Nap as a novel treatment for OS.
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Affiliation(s)
- Staci L. Haney
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE
| | - Dan Feng
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE
| | - Sai Sundeep Kollala
- Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, Omaha, NE
| | - Yashpal S. Chhonker
- Department of Pharmacy Practice and Science, University of Nebraska Medical Center, Omaha, NE
| | - Michelle L. Varney
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE
| | - Jacob T. Williams
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE
| | - James B. Ford
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE
| | - Daryl J. Murry
- Department of Pharmacy Practice and Science, University of Nebraska Medical Center, Omaha, NE
| | - Sarah A. Holstein
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE
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Berkowitz AJ, Murelli RP. Synthesis of α-Tropolones through Autoxidation of Dioxole-Fused Cycloheptatrienes. J Org Chem 2022; 87:4499-4507. [PMID: 35007070 PMCID: PMC9002940 DOI: 10.1021/acs.joc.1c02713] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein, we describe the formation of tropolones through the autoxidation of Büchner reaction-derived cycloheptatrienes. The reaction is exceptionally simple procedurally, as it involves blowing a stream of compressed air over the cycloheptatriene, and the products can be obtained without any need for chromatography. The chemistry works specifically on dioxolane-fused systems or close variants, and substitution patterns are also important. A radical-based mechanistic hypothesis is put forward to explain these results. Finally, we demonstrate the utility of the overall process in the synthesis of amide-appended tropolones and an isomer of stipitatic acid.
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Affiliation(s)
- Alex J Berkowitz
- Department of Chemistry, Brooklyn College, The City University of New York, Brooklyn, New York 11210, United States.,Ph.D. Program in Chemistry, The Graduate Center of The City University of New York, New York, New York 10016, United States
| | - Ryan P Murelli
- Department of Chemistry, Brooklyn College, The City University of New York, Brooklyn, New York 11210, United States.,Ph.D. Program in Chemistry, The Graduate Center of The City University of New York, New York, New York 10016, United States.,Ph.D. Program in Biochemistry, The Graduate Center of The City University of New York, New York, New York 10016, United States
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Hinokitiol-induced decreases of tyrosinase and microphthalmia-associated transcription factor are mediated by the endoplasmic reticulum-associated degradation pathway in human melanoma cells. Biochimie 2021; 192:13-21. [PMID: 34536557 DOI: 10.1016/j.biochi.2021.09.007] [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: 03/25/2021] [Revised: 09/08/2021] [Accepted: 09/09/2021] [Indexed: 01/23/2023]
Abstract
Tyrosinase (TYR) is a key enzyme for melanin production. We previously showed that hinokitiol, a naturally occurring seven-membered ring terpenoid, potently inhibits human TYR activity. Interestingly, hinokitiol was recently reported to decrease expression of TYR and microphthalmia-associated transcription factor (MITF), which is a main transcription factor of the TYR gene, in murine melanoma cells. However, the mechanisms by which hinokitiol decreases the intracellular levels of TYR and MITF have not been fully elucidated. Here, we investigated the underlying mechanisms of the decreases using cultured human melanoma cells. As a result, hinokitiol treatment decreased TYR protein level in a time- and dose-dependent manner in G361 human melanoma cells, while MITF protein level was decreased only at higher concentrations after 3 days treatment. Notably, the mRNA levels of TYR and MITF were slightly increased by hinokitiol treatment. Therefore, we focused on the degradation of TYR and MITF in endoplasmic reticulum (ER)-associated protein degradation (ERAD) pathway. Importantly, co-treatment of ERAD inhibitor with hinokitiol restored the protein levels of TYR and MITF to approximately 30% and 20% of total those in untreated control cells, respectively. Hinokitiol affected the ER homeostasis as well as degradation of TYR and MITF in two human melanoma cell lines, G361 and HT-144, but the changes of ER-stress markers under the hinokitiol treatment were different in the two human melanoma cell lines. Taken together, these observations indicate that hinokitiol may induce ER stress and trigger the degradation of unfolded newly synthesizing TYR and MITF via the ERAD pathway.
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Chu B, Mo X, Chen Z, Zhang M, Liang Y, Hu H, Liu D, Liang F. Synthesis and anticancer activity of mixed ligand 3d metal complexes. Metallomics 2021; 13:6184049. [PMID: 33755727 DOI: 10.1093/mtomcs/mfab011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 03/13/2021] [Accepted: 03/17/2021] [Indexed: 11/13/2022]
Abstract
Our previously reported copper-based complexes of tropolone show nice antitumor effects, but with high cytotoxicity to normal cells, which is presumably caused by copper ions. Here, we managed to achieve this challenge by using other 3D metals to replace copper ions. We thus prepared four mononuclear 3D metal complexes [M(phen)L2] (M = Mn, Co, Ni, and Zn for 1-4, respectively). Complexes 1 and 4 show selectivity on different cancer cell lines with much lower cytotoxicity to normal cells than cisplatin. The anticancer effects for complexes 2 and 3 on the tested cancer cell lines are very poor. It revealed a tuning effect of different metal ions on the anticancer activities with those for Mn(II) and Zn(II) being much higher than those for Co(II) and Ni(II) in this system. Among them, complex 1 presents a best anticancer effect on HeLa cells comparable to cisplatin. It overcame the afore-mentioned shortage of high cytotoxicity to normal cells for the reported Cu(II) complexes. It revealed from the mechanistic studies that complex 1 mainly induces apoptosis through the mitochondrial pathway by increasing intracellular reactive oxygen species, releasing Ca2+, and activating Caspase 9 and proapoptotic gene Bax.
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Affiliation(s)
- Bo Chu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R. China
| | - Xiyu Mo
- Department of Food and Chemical Engineering, Liuzhou Institute of Technology, Liuzhou 545616, P. R. China
| | - Zilu Chen
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R. China
| | - Mingling Zhang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R. China
| | - Yuning Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R. China
| | - Huancheng Hu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R. China
| | - Dongcheng Liu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R. China
| | - Fupei Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R. China.,Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, P. R. China
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Camiolo G, Barbato A, Giallongo C, Vicario N, Romano A, Parrinello NL, Parenti R, Sandoval JC, García-Moreno D, Lazzarino G, Avola R, Palumbo GA, Mulero V, Li Volti G, Tibullo D, Di Raimondo F. Iron regulates myeloma cell/macrophage interaction and drives resistance to bortezomib. Redox Biol 2020; 36:101611. [PMID: 32863212 PMCID: PMC7327252 DOI: 10.1016/j.redox.2020.101611] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 06/11/2020] [Accepted: 06/16/2020] [Indexed: 02/08/2023] Open
Abstract
Iron plays a major role in multiple processes involved in cell homeostasis such as metabolism, respiration and DNA synthesis. Cancer cells exhibit pronounced iron retention as compared to healthy counterpart. This phenomenon also occurs in multiple myeloma (MM), a hematological malignancy characterized by terminally differentiated plasma cells (PCs), in which serum ferritin levels have been reported as a negative prognostic marker. The aim of current study is to evaluate the potential role of iron metabolism in promoting drug resistance in myeloma cancer cells with particular regard to the interactions between PCs and tumor-associated macrophages (TAMs) as a source of iron. Our data showed that myeloma cell lines are able to intake and accumulate iron and thus, increasing their scavenger antioxidant-related genes and mitochondrial mass. We further demonstrated that PCs pre-treated with ferric ammonium citrate (FAC) decreased bortezomib (BTZ)-induced apoptosis in vitro and successfully engrafted in zebrafish larvae treated with BTZ. Treating human macrophages with FAC, we observed a switch toward a M2-like phenotype associated with an increased expression of anti-inflammatory markers such as ARG1, suggesting the establishment of an iron-mediated immune suppressive tumor microenvironment favouring myeloma growth. Using mfap4:tomato mutant zebrafish larvae, we further confirmed the increase of PCs-monocytes interactions after FAC treatment which favour BTZ-resistance. Taken together our data support the hypothesis that targeting iron trafficking in myeloma microenvironment may represent a promising strategy to counteract a tumor-supporting milieu and drug resistance.
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Affiliation(s)
- Giuseppina Camiolo
- Section of Biochemistry, Department of Biomedical and Biotechnological Sciences, University of Catania, 95123, Catania, Italy
| | - Alessandro Barbato
- Section of Hematology, Department of Medical and Surgical Specialties, A.O.U. Policlinico-OVE, University of Catania, 95125, Catania, Italy
| | - Cesarina Giallongo
- Section of Hematology, Department of Medical, Surgical Sciences and Advanced Technologies "G.F. Ingrassia", A.O.U. Policlinico-OVE, University of Catania, 95125, Catania, Italy.
| | - Nunzio Vicario
- Section of Physiology, Department of Biomedical and Biotechnological Sciences, University of Catania, 95123, Catania, Italy
| | - Alessandra Romano
- Section of Hematology, Department of Medical and Surgical Specialties, A.O.U. Policlinico-OVE, University of Catania, 95125, Catania, Italy
| | - Nunziatina L Parrinello
- Division of Hematology, A.O.U. Policlinico-OVE, University of Catania, 95122, Catania, Italy
| | - Rosalba Parenti
- Section of Physiology, Department of Biomedical and Biotechnological Sciences, University of Catania, 95123, Catania, Italy
| | - Joaquín Cantón Sandoval
- Departamento de Biología Celular e Histología, Facultad de Biología, Universidad de MurciaIMIB-Arrixaca, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Murcia, 30100, Spain
| | - Diana García-Moreno
- Departamento de Biología Celular e Histología, Facultad de Biología, Universidad de MurciaIMIB-Arrixaca, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Murcia, 30100, Spain
| | - Giacomo Lazzarino
- UniCamillus - Saint Camillus International University of Health Sciences, Via di Sant'Alessandro 8, 00131, Rome, Italy
| | - Roberto Avola
- Section of Biochemistry, Department of Biomedical and Biotechnological Sciences, University of Catania, 95123, Catania, Italy
| | - Giuseppe A Palumbo
- Section of Hematology, Department of Medical, Surgical Sciences and Advanced Technologies "G.F. Ingrassia", A.O.U. Policlinico-OVE, University of Catania, 95125, Catania, Italy
| | - Victoriano Mulero
- Departamento de Biología Celular e Histología, Facultad de Biología, Universidad de MurciaIMIB-Arrixaca, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Murcia, 30100, Spain
| | - Giovanni Li Volti
- Section of Biochemistry, Department of Biomedical and Biotechnological Sciences, University of Catania, 95123, Catania, Italy
| | - Daniele Tibullo
- Section of Biochemistry, Department of Biomedical and Biotechnological Sciences, University of Catania, 95123, Catania, Italy
| | - Francesco Di Raimondo
- Section of Hematology, Department of Medical and Surgical Specialties, A.O.U. Policlinico-OVE, University of Catania, 95125, Catania, Italy
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