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Chaverra-Muñoz L, Briem T, Hüttel S. Optimization of the production process for the anticancer lead compound illudin M: downstream processing. Microb Cell Fact 2022; 21:165. [PMID: 35978411 PMCID: PMC9382783 DOI: 10.1186/s12934-022-01886-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Accepted: 08/03/2022] [Indexed: 11/16/2022] Open
Abstract
Background Secondary metabolites have played a key role as starting points for drug development programs due to their often unique features compared with synthetically derived molecules. However, limitations related to the discovery and supply of these molecules by biotechnological means led to the retraction of big pharmaceutical companies from this field. The reasons included problems associated with strain culturing, screening, re-discovery, purification and characterization of novel molecules from natural sources. Nevertheless, recent reports have described technical developments that tackle such issues. While many of these reports focus on the identification and characterization of such molecules to enable subsequent chemical synthesis, a biotechnological supply strategy is rarely reported. This may be because production processes usually fall under proprietary research and/or few processes may meet the requirements of a pharmaceutical development campaign. We aimed to bridge this gap for illudin M—a fungal sesquiterpene used for the development of anticancer agents—with the intention to show that biotechnology can be a vital alternative to synthetic processes dealing with small molecules. Results We used µL-scale models to develop an adsorption and extraction strategy for illudin M recovery from culture supernatant of Omphalotus nidiformis and these findings were successfully transferred into lab-scale. By adsorbing and eluting the product using a fixed resin-bed we reduced the working volume by ~ 90% and removed the aqueous phase from the process. After a washing step, a highly concentrated illudin M fraction was obtained by isocratic elution with 80% methanol. The fraction was dried and extracted using a water/heptane mixture, enriching illudin M in the heptane phase. From heptane illudin M could be instantly crystalized by concentrating the solution, achieving a final purity > 95%. Conclusion We have developed a robust, scalable and low-cost downstream process to obtain highly pure illudin M. By using solid phase extraction we reduced the production of solvent waste. Heptane from the final purification step could be recycled. The reduced amounts of solvents required, and the short purification time render this method a very economic and ecologic alternative to published processes. Supplementary Information The online version contains supplementary material available at 10.1186/s12934-022-01886-2.
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Affiliation(s)
- Lillibeth Chaverra-Muñoz
- Department of Microbial Drugs, Helmholtz Centre for Infection Research, Brunswick, Germany.,German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, Brunswick, Germany
| | - Theresa Briem
- Department of Microbial Drugs, Helmholtz Centre for Infection Research, Brunswick, Germany
| | - Stephan Hüttel
- Department of Microbial Drugs, Helmholtz Centre for Infection Research, Brunswick, Germany. .,German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, Brunswick, Germany.
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Chaverra-Muñoz L, Briem T, Hüttel S. Optimization of the production process for the anticancer lead compound illudin M: improving titers in shake-flasks. Microb Cell Fact 2022; 21:98. [PMID: 35643529 PMCID: PMC9148526 DOI: 10.1186/s12934-022-01827-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 05/12/2022] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND The fungal sesquiterpenes Illudin M and S are important base molecules for the development of new anticancer agents due to their strong activity against some resistant tumor cell lines. Due to nonspecific toxicity of the natural compounds, improvement of the pharmacophore is required. A semisynthetic derivative of illudin S (Irofulven) entered phase II clinical trials for the treatment of castration-resistant metastatic prostate cancer. Several semisynthetic illudin M derivatives showed increased in vitro selectivity and improved therapeutic index against certain tumor cell lines, encouraging further investigation. This requires a sustainable supply of the natural compound, which is produced by Basidiomycota of the genus Omphalotus. We aimed to develop a robust biotechnological process to deliver illudin M in quantities sufficient to support medicinal chemistry studies and future preclinical and clinical development. In this study, we report the initial steps towards this goal. RESULTS After establishing analytical workflows, different culture media and commercially available Omphalotus strains were screened for the production of illudin M.Omphalotus nidiformis cultivated in a medium containing corn steep solids reached ~ 38 mg L-1 setting the starting point for optimization. Improved seed preparation in combination with a simplified medium (glucose 13.5 g L-1; corn steep solids 7.0 g L- 1; Dox broth modified 35 mL), reduced cultivation time and enhanced titers significantly (~ 400 mg L-1). Based on a reproducible cultivation method, a feeding strategy was developed considering potential biosynthetic bottlenecks. Acetate and glucose were fed at 96 h (8.0 g L-1) and 120 h (6.0 g L-1) respectively, which resulted in final illudin M titer of ~ 940 mg L-1 after eight days. This is a 25 fold increase compared to the initial titer. CONCLUSION After strict standardization of seed-preparation and cultivation parameters, a combination of experimental design, empirical trials and additional supply of limiting biosynthetic precursors, led to a highly reproducible process in shake flasks with high titers of illudin M. These findings are the base for further work towards a scalable biotechnological process for a stable illudin M supply.
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Affiliation(s)
- Lillibeth Chaverra-Muñoz
- Department of Microbial Drugs, Helmholtz Centre for Infection Research, Brunswick, Germany
- German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, Brunswick, Germany
| | - Theresa Briem
- Department of Microbial Drugs, Helmholtz Centre for Infection Research, Brunswick, Germany
| | - Stephan Hüttel
- Department of Microbial Drugs, Helmholtz Centre for Infection Research, Brunswick, Germany
- German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, Brunswick, Germany
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Yu JH, Yu ZP, Capon RJ, Zhang H. Natural Enantiomers: Occurrence, Biogenesis and Biological Properties. Molecules 2022; 27:1279. [PMID: 35209066 PMCID: PMC8880303 DOI: 10.3390/molecules27041279] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 02/09/2022] [Accepted: 02/10/2022] [Indexed: 02/01/2023] Open
Abstract
The knowledge that natural products (NPs) are potent and selective modulators of important biomacromolecules (e.g., DNA and proteins) has inspired some of the world's most successful pharmaceuticals and agrochemicals. Notwithstanding these successes and despite a growing number of reports on naturally occurring pairs of enantiomers, this area of NP science still remains largely unexplored, consistent with the adage "If you don't seek, you don't find". Statistically, a rapidly growing number of enantiomeric NPs have been reported in the last several years. The current review provides a comprehensive overview of recent records on natural enantiomers, with the aim of advancing awareness and providing a better understanding of the chemical diversity and biogenetic context, as well as the biological properties and therapeutic (drug discovery) potential, of enantiomeric NPs.
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Affiliation(s)
- Jin-Hai Yu
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China; (J.-H.Y.); (Z.-P.Y.)
| | - Zhi-Pu Yu
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China; (J.-H.Y.); (Z.-P.Y.)
| | - Robert J. Capon
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Hua Zhang
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
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Kulkarni A, McDermott JR, Kathad U, Modali R, Richard JP, Sharma P, Bhatia K. The acylfulvene alkylating agent, LP-184, retains nanomolar potency in non-small cell lung cancer carrying otherwise therapy-refractory mutations. Oncotarget 2021; 12:791-806. [PMID: 33889302 PMCID: PMC8057270 DOI: 10.18632/oncotarget.27943] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 03/29/2021] [Indexed: 11/25/2022] Open
Abstract
More than 40% of non-small cell lung cancer (NSCLC) patients lack actionable targets and require non-targeted chemotherapeutics. Many become refractory to drugs due to underlying resistance-associated mutations. KEAP1 mutant NSCLCs further activate NRF2 and upregulate its client PTGR1. LP-184, a novel alkylating agent belonging to the acylfulvene class is a prodrug dependent upon PTGR1. We hypothesized that NSCLC with KEAP1 mutations would continue to remain sensitive to LP-184. LP-184 demonstrated highly potent anticancer activity both in primary NSCLC cell lines and in those originating from brain metastases of primary lung cancers. LP-184 activity correlated with PTGR1 transcript levels but was independent of mutations in key oncogenes (KRAS and KEAP1) and tumor suppressors (TP53 and STK11). LP-184 was orders of magnitude more potent in vitro than cisplatin and pemetrexed. Correlative analyses of sensitivity with cell line gene expression patterns indicated that alterations in NRF2, MET, EGFR and BRAF consistently modulated LP-184 sensitivity. These correlations were then extended to TCGA analysis of 517 lung adenocarcinoma patients, out of which 35% showed elevated PTGR1, and 40% of those further displayed statistically significant co-occurrence of KEAP1 mutations. The gene correlates of LP-184 sensitivity allow additional personalization of therapeutic options for future treatment of NSCLC.
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Affiliation(s)
| | | | | | - Rama Modali
- REPROCELL USA Inc., Beltsville, MD 20705, USA
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Kathad U, Kulkarni A, McDermott JR, Wegner J, Carr P, Biyani N, Modali R, Richard JP, Sharma P, Bhatia K. A machine learning-based gene signature of response to the novel alkylating agent LP-184 distinguishes its potential tumor indications. BMC Bioinformatics 2021; 22:102. [PMID: 33653269 PMCID: PMC7923321 DOI: 10.1186/s12859-021-04040-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 02/15/2021] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Non-targeted cytotoxics with anticancer activity are often developed through preclinical stages using response criteria observed in cell lines and xenografts. A panel of the NCI-60 cell lines is frequently the first line to define tumor types that are optimally responsive. Open data on the gene expression of the NCI-60 cell lines, provides a unique opportunity to add another dimension to the preclinical development of such drugs by interrogating correlations with gene expression patterns. Machine learning can be used to reduce the complexity of whole genome gene expression patterns to derive manageable signatures of response. Application of machine learning in early phases of preclinical development is likely to allow a better positioning and ultimate clinical success of molecules. LP-184 is a highly potent novel alkylating agent where the preclinical development is being guided by a dedicated machine learning-derived response signature. We show the feasibility and the accuracy of such a signature of response by accurately predicting the response to LP-184 validated using wet lab derived IC50s on a panel of cell lines. RESULTS We applied our proprietary RADR® platform to an NCI-60 discovery dataset encompassing LP-184 IC50s and publicly available gene expression data. We used multiple feature selection layers followed by the XGBoost regression model and reduced the complexity of 20,000 gene expression values to generate a 16-gene signature leading to the identification of a set of predictive candidate biomarkers which form an LP-184 response gene signature. We further validated this signature and predicted response to an additional panel of cell lines. Considering fold change differences and correlation between actual and predicted LP-184 IC50 values as validation performance measures, we obtained 86% accuracy at four-fold cut-off, and a strong (r = 0.70) and significant (p value 1.36e-06) correlation between actual and predicted LP-184 sensitivity. In agreement with the perceived mechanism of action of LP-184, PTGR1 emerged as the top weighted gene. CONCLUSION Integration of a machine learning-derived signature of response with in vitro assessment of LP-184 efficacy facilitated the derivation of manageable yet robust biomarkers which can be used to predict drug sensitivity with high accuracy and clinical value.
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Affiliation(s)
- Umesh Kathad
- Lantern Pharma, Inc., 1920 McKinney Ave, 7th floor, Dallas, TX, 75201, USA.
| | - Aditya Kulkarni
- Lantern Pharma, Inc., 1920 McKinney Ave, 7th floor, Dallas, TX, 75201, USA
| | | | - Jordan Wegner
- Lantern Pharma, Inc., 1920 McKinney Ave, 7th floor, Dallas, TX, 75201, USA
| | - Peter Carr
- Lantern Pharma, Inc., 1920 McKinney Ave, 7th floor, Dallas, TX, 75201, USA
| | - Neha Biyani
- Lantern Pharma, Inc., 1920 McKinney Ave, 7th floor, Dallas, TX, 75201, USA
| | - Rama Modali
- REPROCELL USA Inc., 9000 Virginia Manor Rd, Ste 207, Beltsville, MD, 20705, USA
| | | | - Panna Sharma
- Lantern Pharma, Inc., 1920 McKinney Ave, 7th floor, Dallas, TX, 75201, USA
| | - Kishor Bhatia
- Lantern Pharma, Inc., 1920 McKinney Ave, 7th floor, Dallas, TX, 75201, USA
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Le P, Nodwell MB, Eirich J, Sieber SA. A Chemical Proteomic Analysis of Illudin-Interacting Proteins. Chemistry 2019; 25:12644-12651. [PMID: 31310394 PMCID: PMC6900183 DOI: 10.1002/chem.201902919] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 07/15/2019] [Indexed: 01/22/2023]
Abstract
The illudin natural product family are fungal secondary metabolites with a characteristic spirocyclopropyl-substituted fused 6,5-bicyclic ring system. They have been extensively studied for their cytotoxicity in various tumor cell types, and semisynthetic derivatives with improved therapeutic characteristics have progressed to clinical trials. Although it is believed that this potent alkylating compound class acts mainly through DNA modification, little is known about its binding to protein sites in a cellular context. To reveal putative protein targets of the illudin family in live cancer cells, we employed a semisynthetic strategy to access a series of illudin-based probes for activity-based protein profiling (ABPP). While the probes largely retained potent cytotoxicity, proteomic profiling studies unraveled multiple protein hits, suggesting that illudins exert their mode of action not from addressing a specific protein target but rather from DNA modification and unselective protein binding.
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Affiliation(s)
- Philipp Le
- Department Chemie, Center for Integrated Protein Science (CIPSM)Technische Universität MünchenLichtenbergstraße 485748GarchingGermany
| | - Matthew B. Nodwell
- Department Chemie, Center for Integrated Protein Science (CIPSM)Technische Universität MünchenLichtenbergstraße 485748GarchingGermany
- Current address: Department of ChemistrySimon Fraser UniversityBurnabyCanada
| | - Jürgen Eirich
- Department Chemie, Center for Integrated Protein Science (CIPSM)Technische Universität MünchenLichtenbergstraße 485748GarchingGermany
- Current address: Institute for Plant Biology and Biotechnology (IBBP)Universität MünsterMünsterGermany
| | - Stephan A. Sieber
- Department Chemie, Center for Integrated Protein Science (CIPSM)Technische Universität MünchenLichtenbergstraße 485748GarchingGermany
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Yin X, Yang AA, Gao JM. Mushroom Toxins: Chemistry and Toxicology. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:5053-5071. [PMID: 30986058 DOI: 10.1021/acs.jafc.9b00414] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Mushroom consumption is a global tradition that is still gaining popularity. However, foraging for wild mushrooms and accidental ingestion of toxic mushrooms can result in serious illness and even death. The early diagnosis and treatment of mushroom poisoning are quite difficult, as the symptoms are similar to those caused by common diseases. Chemically, mushroom poisoning is related to very powerful toxins, suggesting that the isolation and identification of toxins have great research value, especially in determining the lethal components of toxic mushrooms. In contrast, most of these toxins have remarkable physiological properties that could promote advances in chemistry, biochemistry, physiology, and pharmacology. Although more than 100 toxins have been elucidated, there are a number of lethal mushrooms that have not been fully investigated. This review provides information on the chemistry (including chemical structures, total synthesis, and biosynthesis) and the toxicology of these toxins, hoping to inspire further research in this area.
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Affiliation(s)
- Xia Yin
- Shaanxi Key Laboratory of Natural Products & Chemistry Biology, College of Chemistry & Pharmacy , Northwest A & F University , Yangling 712100 , People's Republic of China
| | - An-An Yang
- Department of Pathology , The 969th Hospital of PLA , Hohhot , Inner Mongolia 010000 , People's Republic of China
| | - Jin-Ming Gao
- Shaanxi Key Laboratory of Natural Products & Chemistry Biology, College of Chemistry & Pharmacy , Northwest A & F University , Yangling 712100 , People's Republic of China
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8
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O'Connor PJ, Alonso-Amelot ME, Roberts SA, Povey AC. The role of bracken fern illudanes in bracken fern-induced toxicities. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2019; 782:108276. [PMID: 31843140 DOI: 10.1016/j.mrrev.2019.05.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 03/29/2019] [Accepted: 05/02/2019] [Indexed: 12/24/2022]
Abstract
Bracken fern is carcinogenic when fed to domestic and laboratory animals inducing bladder and ileal tumours and is currently classified as a possible human carcinogen by IARC. The carcinogenic illudane, ptaquiloside (PTQ) was isolated from bracken fern and is widely assumed to be the major bracken carcinogen. However, several other structurally similar illudanes are found in bracken fern, in some cases at higher levels than PTQ and so may contribute to the overall toxicity and carcinogenicity of bracken fern. In this review, we critically evaluate the role of illudanes in bracken fern induced toxicity and carcinogenicity, the mechanistic basis of these effects including the role of DNA damage, and the potential for human exposure in order to highlight deficiencies in the current literature. Critical gaps remain in our understanding of bracken fern induced carcinogenesis, a better understanding of these processes is essential to establish whether bracken fern is also a human carcinogen.
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Affiliation(s)
- P J O'Connor
- Centre for Occupational and Environmental Health, Centre for Epidemiology, Division of Population Health, Health Services Research and Primary Care, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester, M13 9PL, UK
| | - M E Alonso-Amelot
- Chemical Ecology Group, Faculty of Sciences, University of Los Andes, Mérida 5101, Venezuela
| | - S A Roberts
- Centre for Biostatistics, Division of Population Health, Health Services Research and Primary Care, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester, M13 9PL, UK
| | - A C Povey
- Centre for Occupational and Environmental Health, Centre for Epidemiology, Division of Population Health, Health Services Research and Primary Care, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester, M13 9PL, UK.
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9
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Nord C, Menkis A, Broberg A. Cytotoxic Illudane Sesquiterpenes from the Fungus Granulobasidium vellereum (Ellis and Cragin) Jülich. JOURNAL OF NATURAL PRODUCTS 2015; 78:2559-2564. [PMID: 26575435 DOI: 10.1021/acs.jnatprod.5b00500] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Eight illudane sesquiterpenes were obtained from the wood-decomposing fungus Granulobasidium vellereum (Ellis and Cragin) Jülich; among them were the enantiomers of the known compounds illudin M (1) and dihydroilludin M (4) and the diastereomers of illudin M (2) and illudin S (3), as well as two previously undescribed illudanes (5, 6). The cytotoxicity of compounds 1-4 and 6 was evaluated against two tumor cell lines (Huh7 and MT4), which showed that compounds 1-3 had potent cytotoxic activity, whereas compounds 4 and 6 had no or only moderate effects at concentrations up to 400 μM. Surprisingly, both compounds 2 and 3 were about 10 times more potent than 1. When the chemical reactivity of 1 and 2 was tested, compound 2 was shown to have a substantially higher reaction rate when reacted both with 2 M HCl and with cysteine, indicating that the difference in cytotoxicity is probably due to chemical reactivity and not to enzymatic affinity.
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Affiliation(s)
- Christina Nord
- Department of Chemistry and Biotechnology, Uppsala BioCenter, Swedish University of Agricultural Sciences , P.O. Box 7015, SE-75007, Uppsala, Sweden
| | - Audrius Menkis
- Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences , P.O. Box 7026, SE-75007, Uppsala, Sweden
| | - Anders Broberg
- Department of Chemistry and Biotechnology, Uppsala BioCenter, Swedish University of Agricultural Sciences , P.O. Box 7015, SE-75007, Uppsala, Sweden
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10
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Nagamoto Y, Hattori A, Kakeya H, Takemoto Y, Takasu K. pH-sensitive DNA cleaving agents: in situ activation by ring contraction of benzo-fused cyclobutanols. Chem Commun (Camb) 2013; 49:2622-4. [DOI: 10.1039/c3cc39246e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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11
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Tanasova M, Sturla SJ. Chemistry and biology of acylfulvenes: sesquiterpene-derived antitumor agents. Chem Rev 2012; 112:3578-610. [PMID: 22482429 DOI: 10.1021/cr2001367] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marina Tanasova
- ETH Zurich, Institute of Food, Nutrition and Health, Zurich, Switzerland
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12
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Gersch M, Kreuzer J, Sieber SA. Electrophilic natural products and their biological targets. Nat Prod Rep 2012; 29:659-82. [DOI: 10.1039/c2np20012k] [Citation(s) in RCA: 193] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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13
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Siegel DS, Piizzi G, Piersanti G, Movassaghi M. Enantioselective total synthesis of (-)-acylfulvene and (-)-irofulven. J Org Chem 2009; 74:9292-304. [PMID: 19938810 PMCID: PMC2805080 DOI: 10.1021/jo901926z] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We report our full account of the enantioselective total synthesis of (-)-acylfulvene (1) and (-)-irofulven (2), which features metathesis reactions for the rapid assembly of the molecular framework of these antitumor agents. We discuss (1) the application of an Evans Cu-catalyzed aldol addition reaction using a strained cyclopropyl ketenethioacetal, (2) an efficient enyne ring-closing metathesis cascade reaction in a challenging setting, (3) the reagent IPNBSH for a late-stage reductive allylic transposition reaction, and (4) the final RCM/dehydrogenation sequence for the formation of (-)-acylfulvene (1) and (-)-irofulven (2).
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Affiliation(s)
- Dustin S Siegel
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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14
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Movassaghi M, Piizzi G, Siegel DS, Piersanti G. Observations in the Synthesis of the Core of the Antitumor Illudins via an Enyne Ring Closing Metathesis Cascade. Tetrahedron Lett 2009; 50:5489-5492. [PMID: 20160945 PMCID: PMC2766079 DOI: 10.1016/j.tetlet.2009.07.102] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Observations concerning the synthesis of the core spirocyclic AB-ring system of illudins using an enyne ring closing metathesis (EYRCM) cascade are discussed. Substituent effects, in addition to optimization of the reaction conditions and the olefin tether for the key EYRCM reaction, are examined.
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Affiliation(s)
- Mohammad Movassaghi
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Grazia Piizzi
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Dustin S. Siegel
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Giovanni Piersanti
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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15
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McMorris TC, Cong Q, Kelner MJ. Structure−Activity Relationship Studies of Illudins: Analogues Possessing a Spiro-cyclobutane Ring. J Org Chem 2003; 68:9648-53. [PMID: 14656090 DOI: 10.1021/jo0346499] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bicyclic and tricyclic analogues of anticancer sesquiterpene illudin S have been synthesized. These contain a spiro-cyclobutane instead of spiro-cyclopropane structure. The cytotoxicity of the former is less than that of the corresponding cyclopropane-containing compounds.
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Affiliation(s)
- Trevor C McMorris
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0506, USA.
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16
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Lehmann VKB, Huang A, Ibanez-Calero S, Wilson GR, Rinehart KL. Illudin S, the sole antiviral compound in mature fruiting bodies of Omphalotus illudens. JOURNAL OF NATURAL PRODUCTS 2003; 66:1257-8. [PMID: 14510611 DOI: 10.1021/np030205w] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Crude extracts from the fruiting bodies of Omphalotus illudens displayed activity in the HSV-I/CV-1 antiviral assay. Bioactivity-guided isolation led to the known compound illudin S (1) as the sole antiviral component present in these extracts.
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Affiliation(s)
- Virginia K B Lehmann
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, USA.
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17
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Wolkenberg SE, Boger DL. Mechanisms of in situ activation for DNA-targeting antitumor agents. Chem Rev 2002; 102:2477-95. [PMID: 12105933 DOI: 10.1021/cr010046q] [Citation(s) in RCA: 288] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Scott E Wolkenberg
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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18
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McMorris TC, Yu J, Lira R, Dawe R, MacDonald JR, Waters SJ, Estes LA, Kelner MJ. Structure-activity studies of antitumor agent irofulven (hydroxymethylacylfulvene) and analogues. J Org Chem 2001; 66:6158-63. [PMID: 11529745 DOI: 10.1021/jo010458z] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Many analogues of the antitumor agent irofulven have been readily prepared by replacing the allylic hydroxyl with a variety of nucleophiles. Analogues of acylfulvene (the precursor to irofulven) were also prepared by Michael reaction with acrolein. The toxicity of the analogues was determined, as well as preclinical antitumor activity. Several analogues exhibited good activity in mouse xenografts. Structural requirements for activity are discussed.
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Affiliation(s)
- T C McMorris
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0506, USA.
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Eckhardt SG, Baker SD, Britten CD, Hidalgo M, Siu L, Hammond LA, Villalona-Calero MA, Felton S, Drengler R, Kuhn JG, Clark GM, Smith SL, MacDonald JR, Smith C, Moczygemba J, Weitman S, Von Hoff DD, Rowinsky EK. Phase I and pharmacokinetic study of irofulven, a novel mushroom-derived cytotoxin, administered for five consecutive days every four weeks in patients with advanced solid malignancies. J Clin Oncol 2000; 18:4086-97. [PMID: 11118470 DOI: 10.1200/jco.2000.18.24.4086] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PURPOSE To evaluate the toxicity and pharmacologic behavior of the novel mushroom-derived cytotoxin irofulven administered as a 5-minute intravenous (IV) infusion daily for 5 days every 4 weeks to patients with advanced solid malignancies. PATIENTS AND METHODS In this phase I trial, 46 patients were treated with irofulven doses ranging from 1.0 to 17.69 mg/m(2) as a 5-minute IV infusion (two patients received a 1-hour infusion) daily for 5 days every 4 weeks. The modified continual reassessment method was used for dose escalation. Pharmacokinetic studies were performed on days 1 and 5 to characterize the plasma disposition of irofulven. RESULTS Forty-six patients were treated with 92 courses of irofulven. The dose-limiting toxicities on this schedule were myelosuppression and renal dysfunction. At the 14.15-mg/m(2) dose level, renal dysfunction resembling renal tubular acidosis occurred in four of 10 patients and was ameliorated by prophylactic IV hydration. The 17.69-mg/m(2) dose level was not tolerated because of grade 4 neutropenia and renal toxicity, whereas the 14.15-mg/m(2) dose level was not tolerable with repetitive dosing because of persistent thrombocytopenia. Other common toxicities included mild to moderate nausea, vomiting, facial erythema, and fatigue. One partial response occurred in a patient with advanced, refractory metastatic pancreatic cancer lasting 7 months. Pharmacokinetic studies of irofulven revealed dose-proportional increases in both maximum plasma concentrations and area under the concentration-time curve, while the agent exhibited a rapid elimination half-life of 2 to 10 minutes. CONCLUSION Given the results of this study, the recommended dose of irofulven is 10.64 mg/m(2) as a 5-minute IV infusion daily for 5 days every 4 weeks. The preliminary antitumor activity documented in a patient with advanced pancreatic cancer and the striking preclinical antitumor effects of irofulven observed on intermittent dosing schedules support further disease-directed evaluations of this agent on the schedule evaluated in this study.
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Affiliation(s)
- S G Eckhardt
- Institute for Drug Development, Cancer Therapy and Research Center, and Department of Medicine, Division of Oncology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
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de Meijere A, Kozhushkov SI. The chemistry of highly strained oligospirocyclopropane systems. Chem Rev 2000; 100:93-142. [PMID: 11749235 DOI: 10.1021/cr960153y] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A de Meijere
- Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
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Zorn C, Anichini B, Goti A, Brandi A, Kozhushkov SI, de Meijere A, Citti L. Studies on the Synthesis of Aza Analogues of Illudins by Cycloadditions to Highly Strained Methylenecyclopropanes. J Org Chem 1999. [DOI: 10.1021/jo990873f] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chiara Zorn
- Dipartimento di Chimica Organica “U. Schiff”, Centro di Studio C.N.R. sui Composti Eterociclici, Università di Firenze, via G. Capponi 9, I-50121 Firenze, Italy, Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany, and Istituto per lo Studio della Mutagenesi e Differenziamento, C.N.R., via Svezia 10, I-56124 Pisa, Italy
| | - Beatrice Anichini
- Dipartimento di Chimica Organica “U. Schiff”, Centro di Studio C.N.R. sui Composti Eterociclici, Università di Firenze, via G. Capponi 9, I-50121 Firenze, Italy, Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany, and Istituto per lo Studio della Mutagenesi e Differenziamento, C.N.R., via Svezia 10, I-56124 Pisa, Italy
| | - Andrea Goti
- Dipartimento di Chimica Organica “U. Schiff”, Centro di Studio C.N.R. sui Composti Eterociclici, Università di Firenze, via G. Capponi 9, I-50121 Firenze, Italy, Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany, and Istituto per lo Studio della Mutagenesi e Differenziamento, C.N.R., via Svezia 10, I-56124 Pisa, Italy
| | - Alberto Brandi
- Dipartimento di Chimica Organica “U. Schiff”, Centro di Studio C.N.R. sui Composti Eterociclici, Università di Firenze, via G. Capponi 9, I-50121 Firenze, Italy, Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany, and Istituto per lo Studio della Mutagenesi e Differenziamento, C.N.R., via Svezia 10, I-56124 Pisa, Italy
| | - Sergei I. Kozhushkov
- Dipartimento di Chimica Organica “U. Schiff”, Centro di Studio C.N.R. sui Composti Eterociclici, Università di Firenze, via G. Capponi 9, I-50121 Firenze, Italy, Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany, and Istituto per lo Studio della Mutagenesi e Differenziamento, C.N.R., via Svezia 10, I-56124 Pisa, Italy
| | - Armin de Meijere
- Dipartimento di Chimica Organica “U. Schiff”, Centro di Studio C.N.R. sui Composti Eterociclici, Università di Firenze, via G. Capponi 9, I-50121 Firenze, Italy, Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany, and Istituto per lo Studio della Mutagenesi e Differenziamento, C.N.R., via Svezia 10, I-56124 Pisa, Italy
| | - Lorenzo Citti
- Dipartimento di Chimica Organica “U. Schiff”, Centro di Studio C.N.R. sui Composti Eterociclici, Università di Firenze, via G. Capponi 9, I-50121 Firenze, Italy, Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany, and Istituto per lo Studio della Mutagenesi e Differenziamento, C.N.R., via Svezia 10, I-56124 Pisa, Italy
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Herzig MC, Arnett B, MacDonald JR, Woynarowski JM. Drug uptake and cellular targets of hydroxymethylacylfulvene (HMAF). Biochem Pharmacol 1999; 58:217-25. [PMID: 10423161 DOI: 10.1016/s0006-2952(99)00085-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Hydroxymethylacylfulvene (HMAF, MGI 114) is a novel antitumor drug and a potent pro-apoptotic agent that has the potential to alkylate cellular nucleophiles. The objective of these studies was to characterize drug uptake and cellular targets for drug binding in human leukemia CEM cells. The uptake of [14C]HMAF had two components: a rapid phase (0-10 min) and a slow phase. At 10 microM drug (37 degrees), the rapid and slower phase amounted to 0.86 and 0.13 pmol/min/10(6)cells, respectively. HMAF uptake was inhibited 82% by low temperature (4 degrees) at 4 hr. Cell-associated HMAF localized to nuclear (50%), cytoplasmic (37%), and membrane fractions (10%). Continued drug uptake appeared to be driven by covalent binding to cellular macromolecules. Approximately 1/4 and 2/3 of cell-associated HMAF formed covalent adducts after 10 min and 4 hr, respectively, as found by perchloric acid precipitation. Drug adducts were not readily reversible; 77% of the covalently bound radiolabel was retained by the cells 20 hr after drug treatment. Combinations of DNase, RNase, and proteinase K with perchloric acid precipitation showed that approximately 60, 30, and 10% of the covalently bound drug was associated with the protein, DNA, and RNA fractions, respectively. Incubation of 100 microM [14C]HMAF (24 hr) with purified DNA, serum albumin, thioredoxin, and thioredoxin reductase resulted in 6, 22, 14, and 11 pmol [14C]HMAF/microg DNA or protein, respectively. Results indicate that multiple targets for HMAF binding may contribute to the pro-apoptotic and antiproliferative action of the drug.
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Affiliation(s)
- M C Herzig
- Cancer Therapy and Research Center, Institute for Drug Development, San Antonio, TX 78245-3217, USA
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McMorris TC. Discovery and development of sesquiterpenoid derived hydroxymethylacylfulvene: a new anticancer drug. Bioorg Med Chem 1999; 7:881-6. [PMID: 10400341 DOI: 10.1016/s0968-0896(99)00016-4] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Hydroxymethylacylfulvene (HMAF, MGI 114) is derived from the sesquiterpene illudin S by treatment with dilute sulfuric acid and excess paraformaldehyde. It is less cytotoxic than illudin S but exhibits much greater selectivity in toxicity to malignant cells compared to normal cells. HMAF is believed to undergo bioreductive activation in vivo. It is now being tested in human clinical phase II trials against solid tumors.
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Affiliation(s)
- T C McMorris
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla 92093, USA
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Woynarowski JM, Napier C, Koester SK, Chen SF, Troyer D, Chapman W, MacDonald JR. Effects on DNA integrity and apoptosis induction by a novel antitumor sesquiterpene drug, 6-hydroxymethylacylfulvene (HMAF, MGI 114). Biochem Pharmacol 1997; 54:1181-93. [PMID: 9416969 DOI: 10.1016/s0006-2952(97)00321-3] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
6-Hydroxymethylacylfulvene (HMAF, MGI 114) is a new alkylating antitumor sesquiterpenoid with promising and often curative antitumor activity in vivo. This study examined the ability of the drug to damage cellular DNA, induce apoptosis, and affect the cell cycle of CEM human leukemia cells. No bifunctional lesions, interstrand DNA cross-links or DNA-protein cross-links were seen (by alkaline sedimentation and K+/SDS precipitation, respectively) when using up to 50 microM HMAF. The drug possibly formed some monoadducts, as DNA from drug-treated cells impeded primer extension by Taq polymerase, although only partial inhibition was seen even at 200 microM HMAF. HMAF also induced secondary lesions in cellular DNA, single-strand breaks that were detectable (by nucleoid sedimentation and alkaline sucrose gradient analysis) after a 4-hr treatment at HMAF levels as low as 2 microM, comparable to the growth inhibition IC50 value (1.7 microM). A post-treatment incubation of cells in drug-free medium generated substantial amounts of DNA double-stranded fragments of several kbp, suggesting apoptotic fragmentation (>30% of total DNA following treatment with 20 microM HMAF and a 17-hr post-treatment incubation). Chromatin condensation (by ultrastructural analysis) and induction of sub-G1 particles and apoptotic strand breakage (by multiparametric flow cytometry) confirmed induction of apoptosis by HMAF. HMAF preferentially inhibited DNA synthesis (IC50 approximately 2 microM), which is consistent with an S phase block, observed by cell cycle analysis. The pattern of apoptotic DNA fragmentation, inhibition of DNA synthesis, and blockage in the S phase suggests that these events play a role in the antiproliferative activity of HMAF.
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Affiliation(s)
- J M Woynarowski
- Cancer Therapy and Research Center, San Antonio, TX 78245-3217, USA.
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McMorris TC, Yu J, Estes LA, Kelner MJ. Reaction of antitumor hydroxymethylacylfulvene (HMAF) with thiols. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)01064-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kinder FR, Chen CP, Bair KW. Synthesis of Tricyclic Analogues of Illudin M. SYNTHETIC COMMUN 1997. [DOI: 10.1080/00397919708004208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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McCloud TG, Klueh PA, Pearl KC, Cartner LK, Muschik GM. Isolation of Illudin S from the Mature Basidiocarp ofOmphalotus Illudens, and Isolation of Illudins S and M from the Fermentation Broth ofOmphalotus Olearis. ACTA ACUST UNITED AC 1996. [DOI: 10.1080/10575639608044931] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Design, synthesis, and antitumor activity of bicyclic and isomeric analogues of illudin M. Bioorg Med Chem Lett 1996. [DOI: 10.1016/0960-894x(96)00167-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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McMorris TC, Kelner MJ, Wang W, Diaz MA, Estes LA, Taetle R. Acylfulvenes, a new class of potent antitumor agents. EXPERIENTIA 1996; 52:75-80. [PMID: 8575564 DOI: 10.1007/bf01922420] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Acylfulvene, derived from the sesquiterpene illudin S by treatment with acid (reverse Prins reaction), is far less reactive to thiols than illudin S. However, it is reduced readily to an aromatic product, in the same way as illudin S. This may explain its greatly improved therapeutic index compared to that of the parent compound.
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Affiliation(s)
- T C McMorris
- Department of Chemistry, University of California, San Diego, La Jolla 92093-0506, USA
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Franck-Neumann M, Miesch M, Barth F. Synthèse totale de la Dihydro-2,3-illudine M par cycloaddition d'enamine sur cyclopropene. Tetrahedron 1993. [DOI: 10.1016/s0040-4020(01)90193-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Brandšteterová E, Kelner MJ, Mc Morris TC, Wang W, Bangell R. HPLC Analysis of Novel Anti-Cancer Agents-Illudins and Their Analogs. ACTA ACUST UNITED AC 1993. [DOI: 10.1080/10826079308020901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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