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Discovery of unusual dimeric piperazyl cyclopeptides encoded by a Lentzea flaviverrucosa DSM 44664 biosynthetic supercluster. Proc Natl Acad Sci U S A 2022; 119:e2117941119. [PMID: 35439047 PMCID: PMC9169926 DOI: 10.1073/pnas.2117941119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Actinomycetes produce many clinically useful drugs, especially antibiotics and anticancer agents. Rare actinomycetes are known to produce bioactive molecules but they remain underexplored compared to more common Streptomyces spp. Natural molecules having piperazate building blocks are often bioactive, and genome analyses previously indicated the rare actinomycete Lentzea flaviverrucosa DSM 44664 may encode for the production of such molecules. To discover these from complex fermentation mixtures, we devised and employed a targeted metabolomic approach that revealed petrichorin A, an unusual heterodimeric biaryl-cyclohexapeptide. Its structure was determined by using multi-dimensional nuclear magnetic resonance, theoretical calculations, and strain mutagenesis, and its biosynthesis implicated an atypical cytochrome p450 heterodimerization event. Petrichorin A demonstrated potent cytotoxicity, highlighting heterodimeric-biaryls as interesting features for future drug design. Rare actinomycetes represent an underexploited source of new bioactive compounds. Here, we report the use of a targeted metabologenomic approach to identify piperazyl compounds in the rare actinomycete Lentzea flaviverrucosa DSM 44664. These efforts to identify molecules that incorporate piperazate building blocks resulted in the discovery and structural elucidation of two dimeric biaryl-cyclohexapeptides, petrichorins A and B. Petrichorin B is a symmetric homodimer similar to the known compound chloptosin, but petrichorin A is unique among known piperazyl cyclopeptides because it is an asymmetric heterodimer. Due to the structural complexity of petrichorin A, solving its structure required a combination of several standard chemical methods plus in silico modeling, strain mutagenesis, and solving the structure of its biosynthetic intermediate petrichorin C for confident assignment. Furthermore, we found that the piperazyl cyclopeptides comprising each half of the petrichorin A heterodimer are made via two distinct nonribosomal peptide synthetase (NRPS) assembly lines, and the responsible NRPS enzymes are encoded within a contiguous biosynthetic supercluster on the L. flaviverrucosa chromosome. Requiring promiscuous cytochrome p450 crosslinking events for asymmetric and symmetric biaryl production, petrichorins A and B exhibited potent in vitro activity against A2780 human ovarian cancer, HT1080 fibrosarcoma, PC3 human prostate cancer, and Jurkat human T lymphocyte cell lines with IC50 values at low nM levels. Cyclic piperazyl peptides and their crosslinked derivatives are interesting drug leads, and our findings highlight the potential for heterodimeric bicyclic peptides such as petrichorin A for inclusion in future pharmaceutical design and discovery programs.
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Bai Y, Sun Y, Xie J, Li B, Bai Y, Zhang D, Liang J, Xiao C, Zhong A, Cao Y, Zheng X. The asarone-derived phenylpropanoids from the rhizome of Acorus calamus var. angustatus Besser. PHYTOCHEMISTRY 2020; 170:112212. [PMID: 31785552 DOI: 10.1016/j.phytochem.2019.112212] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 11/15/2019] [Accepted: 11/16/2019] [Indexed: 06/10/2023]
Abstract
Phenylpropanoids comprise a broad spectrum of biologically active natural products. As part of our ongoing research on antiepileptic active compounds from traditional Chinese herb, Acorus calamus var. angustatus Besser, three undescribed phenylpropanoids and twenty-two known ones were isolated. All the undescribed structures were determined by a combination of 1D and 2D NMR, HRMS. In addition, γ-asaronol was identified as racemates and its absolute configuration were determined by the modified Mosher's method and ECD spectral data. Furthermore, some selected isolated compounds were evaluated for their cell viability and neuroprotective activities in H2O2-induced SH-SY5Y cells. α-Asaronol, β-asaronol, 3-(2,4,5-trimethoxyphenyl)propan-1-ol and 1,2,4-trimethoxy-5-(3-methoxypropyl)benzene exerted potential protective activity from neuronal oxidative stress in all test concentrations ranging from 0.01 to 100 μM, in which the neuroprotective activity of β-asaronol was the best.
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Affiliation(s)
- Yajun Bai
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, The College of Life Sciences, Northwest University, Xi'an 710069, PR China; Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, 710127, PR China
| | - Ying Sun
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, The College of Life Sciences, Northwest University, Xi'an 710069, PR China
| | - Jing Xie
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, The College of Life Sciences, Northwest University, Xi'an 710069, PR China
| | - Bin Li
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, The College of Life Sciences, Northwest University, Xi'an 710069, PR China
| | - Yujun Bai
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, The College of Life Sciences, Northwest University, Xi'an 710069, PR China
| | - Dongxu Zhang
- Department of Medicinal Chemistry, School of Pharmacy Fourth Military Medical University, Xi'an, 710032, PR China
| | - Jing Liang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, 710127, PR China
| | - Chaoni Xiao
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, The College of Life Sciences, Northwest University, Xi'an 710069, PR China
| | - Aiguo Zhong
- College of Pharmaceutical, Chemical and Materials Engineering, Taizhou University, Taizhou, 317000, PR China
| | - Yanjun Cao
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, The College of Life Sciences, Northwest University, Xi'an 710069, PR China.
| | - Xiaohui Zheng
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, The College of Life Sciences, Northwest University, Xi'an 710069, PR China.
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Kumar KJS, Wang SH, Tseng YH, Tsao NW, Kuo YH, Wang SY. trans-3-Methoxy-5-hydroxystilbene (MHS) from the rhizome of Alpinia nantonensis inhibits metastasis in human lung cancer cells. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2018; 50:223-230. [PMID: 30466982 DOI: 10.1016/j.phymed.2018.04.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 03/22/2018] [Accepted: 04/04/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND Alpinia nantoensis (Zingiberaceae) is an aromatic plant endemic to Taiwan, which is used as food flavoring and traditional herbal medicine. The biological activities of compounds isolated from this plant are rarely investigated. PURPOSE The present study was aimed to investigate the anti-metastatic potential of trans-3‑methoxy‑5-hydroxystilbene (MHS) a major stilbene isolated from the rhizomes of A. nantonensis. METHODS We investigated the anti-metastatic potential of MHS on human non-small cell lung carcinoma (A549) cell line using wound healing, trans-well, western blot, zymography and immunofluorescence assays. RESULTS Initial cytotoxicity assay showed that treatment with MHS did not exhibit cytotoxicity to A549 cells up to the concentration of 40 µM. Further in vitro wound healing and transwell chamber assays revealed that MHS significantly inhibited tumor cell migration in a dose-dependent manner, which is associated with inhibition of matrix mettalloprotinase-2 (MMP-2) and matrix mettalloprotinase-9 (MMP-9) at both enzyme and protein levels. The inhibition of MMPs activity by MHS was reasoned by suppression of their corresponding transcription factor, β-catenin as indicated by reduced levels of β-catenin in the nucleus. MHS also regulates epithelial-to-mesenchymal transition (EMT) by increasing E-cadherin and occludin as well as decreasing N-cadherin levels in A549 cells. Furthermore, pre-treatment with MHS significantly inhibited A549 cells migration and EMT in TGF-β induced A549 cells. CONCLUSION To the best of our knowledge, this is the first report demonstrating that MHS, a plant-derived stilbene has a promising ability to inhibit lung cancer cell metastasis in vitro.
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Affiliation(s)
- K J Senthil Kumar
- Department of Forestry, National Chung Hsing University, Taichung, Taiwan
| | - Shi-Han Wang
- Department of Forestry, National Chung Hsing University, Taichung, Taiwan
| | - Yen-Hsueh Tseng
- Department of Forestry, National Chung Hsing University, Taichung, Taiwan
| | - Nai-Wen Tsao
- Department of Forestry, National Chung Hsing University, Taichung, Taiwan
| | - Yueh-Hsiung Kuo
- Department of Chinese Pharmaceutical Sciences and Chinese Medicine Resources, China Medical University, Taichung, Taiwan; Department of Biotechnology, Asia University, Taichung 413, Taiwan
| | - Sheng-Yang Wang
- Department of Forestry, National Chung Hsing University, Taichung, Taiwan; Agricultural Biotechnology Research Institute, Academia Sinica, Taipei, Taiwan.
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Rakotondraibe LH, Graupner PR, Xiong Q, Olson M, Wiley JD, Krai P, Brodie PJ, Callmander MW, Rakotobe E, Ratovoson F, Rasamison VE, Cassera MB, Hahn DR, Kingston DGI, Fotso S. Neolignans and other metabolites from Ocotea cymosa from the Madagascar rain forest and their biological activities. JOURNAL OF NATURAL PRODUCTS 2015; 78:431-40. [PMID: 25650896 PMCID: PMC4410025 DOI: 10.1021/np5008153] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Ten new neolignans including the 6'-oxo-8.1'-lignans cymosalignans A (1a), B (2), and C (3), an 8.O.6'-neolignan (4a), ococymosin (5a), didymochlaenone C (6a), and the bicyclo[3.2.1]octanoids 7-10 were isolated along with the known compounds 3,4,5,3',5'-pentamethoxy-1'-allyl-8.O.4'-neolignan, 3,4,5,3'-tetramethoxy-1'-allyl-8.O.4'-neolignan, didymochlaenone B, virologin B, ocobullenone, and the unusual 2'-oxo-8.1'-lignan sibyllenone from the stems or bark of the Madagascan plant Ocotea cymosa. The new 8.O.6'-neolignan 4a, dihydrobenzofuranoid 5a, and the bicyclo[3.2.1]octanoid 7a had in vitro activity against Aedes aegypti, while the new compounds 5a, 7a, 8, and 10a and the known virolongin B (4b) and ocobullenone (10b) had antiplasmodial activity. We report herein the structure elucidation of the new compounds on the basis of spectroscopic evidence, including 1D and 2D NMR spectra, electronic circular dichroism, and mass spectrometry, and the biological activities of the new and known compounds.
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Affiliation(s)
- L. Harinantenaina Rakotondraibe
- Department of Chemistry and Virginia Tech Center for Drug Discovery, M/C 0212, Virginia Tech, Blacksburg, VA 24061, United States
| | - Paul R. Graupner
- Discovery Research, Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, USA
| | - Quanbo Xiong
- Discovery Research, Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, USA
| | - Monica Olson
- Discovery Research, Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, USA
| | - Jessica D. Wiley
- Department of Biochemistry and Virginia Tech Center for Drug Discovery, M/C 0308, Virginia Tech, Blacksburg, VA 24061, United States
| | - Priscilla Krai
- Department of Biochemistry and Virginia Tech Center for Drug Discovery, M/C 0308, Virginia Tech, Blacksburg, VA 24061, United States
| | - Peggy J. Brodie
- Department of Chemistry and Virginia Tech Center for Drug Discovery, M/C 0212, Virginia Tech, Blacksburg, VA 24061, United States
| | | | - Etienne Rakotobe
- Centre National d’Application des Recherches Pharmaceutiques, B.P 702, Antananarivo 101, Madagascar
| | - Fidy Ratovoson
- Missouri Botanical Garden, B.P 3391, Antananarivo 101, Madagascar
| | - Vincent E. Rasamison
- Centre National d’Application des Recherches Pharmaceutiques, B.P 702, Antananarivo 101, Madagascar
| | - Maria B. Cassera
- Department of Biochemistry and Virginia Tech Center for Drug Discovery, M/C 0308, Virginia Tech, Blacksburg, VA 24061, United States
| | - Donald R. Hahn
- Discovery Research, Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, USA
| | - David G. I. Kingston
- Department of Chemistry and Virginia Tech Center for Drug Discovery, M/C 0212, Virginia Tech, Blacksburg, VA 24061, United States
| | - Serge Fotso
- Discovery Research, Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, USA
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Zhang J, Chen J, Liang Z, Zhao C. New lignans and their biological activities. Chem Biodivers 2014; 11:1-54. [PMID: 24443425 DOI: 10.1002/cbdv.201100433] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2011] [Indexed: 11/10/2022]
Abstract
Lignans, which are widely distributed in higher plants, represent a vast and rather diverse group of phenylpropane derivatives. They have attracted considerable attention due to their pharmacological activities. Some of the lignans have been developed approved therapeutics, and others are considered as lead structures for new drugs. This article is based on our previous review of lignans discovered in the period 2000-2004, and it provides a comprehensive compilation of the 354 new naturally occurring lignans obtained from 61 plant families between 2005 and 2011. We classified five main types according to their structural features, and provided the details of their sources, some typical structures, and diverse biological activities. A tabular compilation of the novel lignans by species is presented at the end. A total of 144 references were considered for this review.
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Affiliation(s)
- Jia Zhang
- Key Laboratory of Cell Proliferation and Regulation Biology (Beijing Normal University), Ministry of Education; Beijing Key Laboratory of Gene Engineering Drugs & Biological Technology, College of Life Science, Beijing Normal University, Beijing 100875, P. R. China (phone: +86-10-58805046; fax: +86-10-58807720)
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Kabbaj FZ, Lai D, Meddah B, Altenbach HJ, Cherrah Y, Proksch P, Faouzi MEA, Debbab A. Chemical constituents from aerial parts of Thymelaea lythroides. BIOCHEM SYST ECOL 2013. [DOI: 10.1016/j.bse.2013.08.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kingston DGI. Modern natural products drug discovery and its relevance to biodiversity conservation. JOURNAL OF NATURAL PRODUCTS 2011; 74:496-511. [PMID: 21138324 PMCID: PMC3061248 DOI: 10.1021/np100550t] [Citation(s) in RCA: 297] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Natural products continue to provide a diverse and unique source of bioactive lead compounds for drug discovery, but maintaining their continued eminence as source compounds is challenging in the face of the changing face of the pharmaceutical industry and the changing nature of biodiversity prospecting brought about by the Convention on Biological Diversity. This review provides an overview of some of these challenges and suggests ways in which they can be addressed so that natural products research can remain a viable and productive route to drug discovery. Results from International Cooperative Biodiversity Groups (ICBGs) working in Madagascar, Panama, and Suriname are used as examples of what can be achieved when biodiversity conservation is linked to drug discovery.
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Affiliation(s)
- David G I Kingston
- Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States.
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Pan JY, Chen SL, Yang MH, Wu J, Sinkkonen J, Zou K. An update on lignans: natural products and synthesis. Nat Prod Rep 2009; 26:1251-92. [PMID: 19779640 DOI: 10.1039/b910940d] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jian-Yu Pan
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Beijing, 100094, China
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Cao S, Kingston DGI. Biodiversity conservation and drug discovery: Can they be combined? The Suriname and Madagascar experiences. PHARMACEUTICAL BIOLOGY 2009; 47:809-823. [PMID: 20161050 PMCID: PMC2746688 DOI: 10.1080/13880200902988629] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The approach to new drugs through natural products has proved to be the single most successful strategy for the discovery of new drugs, but in recent years its use has been deemphasized by many pharmaceutical companies in favor of approaches based on combinatorial chemistry and genomics, among others.Drug discovery from natural sources requires continued access to plant, marine, and microbial biomass, and so the preservation of tropical rainforests is an important part of our drug discovery program. Sadly, many of the tropical forests of the world are under severe environmental pressure, and deforestation is a serious problem in most tropical countries. One way to combat this loss is to demonstrate their value as potential sources of new pharmaceutical or agrochemical products.As part of an effort to integrate biodiversity conservation and drug discovery with economic development, we initiated an International Cooperative biodiversity Group (ICBG) to discover potential pharmaceuticals from the plant biodiversity of Suriname and Madagascar. The Group, established with funding from agencies of the United States government, involved participants from the USA, Suriname, and Madagascar. The basic approach was to search for bioactive plants in the Suriname and Malagasy flora, and to isolate their bioactive constituents by the best available methods, but the work included capacity building as well as research. Progress on this project will be reported, drawing on results obtained from the isolation of bioactive natural products from Suriname and Madagascar. The benefits of this general approach to biodiversity and drug discovery will also be discussed.
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Affiliation(s)
| | - David G. I. Kingston
- Address for correspondence: David G. I. Kingston, Virginia Polytechnic Institute and State University. Tel: (540) 231-6570. Fax: (540) 231-3255.
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Shahjahan Kabir M, Engelbrecht K, Polanowski R, Krueger SM, Ignasiak R, Rott M, Schwan WR, Stemper ME, Reed KD, Sherman D, Cook JM, Monte A. New classes of Gram-positive selective antibacterials: inhibitors of MRSA and surrogates of the causative agents of anthrax and tuberculosis. Bioorg Med Chem Lett 2008; 18:5745-9. [PMID: 18849164 PMCID: PMC7127099 DOI: 10.1016/j.bmcl.2008.09.085] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2008] [Revised: 09/19/2008] [Accepted: 09/22/2008] [Indexed: 11/02/2022]
Abstract
An antimicrobial phenolic stilbene, (E)-3-hydroxy-5-methoxystilbene, 1 was recently isolated from the leaves of Comptonia peregrina (L.) Coulter and shown to possess inhibitory activity against several Gram-positive bacteria, including isolates of methicillin-resistant Staphylococcus aureus (MRSA), Mycobacterium bovis BCG, and avirulent Bacillusanthracis (Sterne strain), among others. These results prompted the design and synthesis of two new classes of compounds, phenoxystyrenes and phenothiostyrenes, as analogs of the natural antimicrobial stilbene. These and additional stilbenoid analogs were synthesized using new, efficient, copper-mediated coupling strategies. Minimum inhibitory concentration (MIC) antimicrobial assays were performed on all compounds prepared. These preliminary structure-activity relationship studies indicated that both new classes of synthetic analogs, as well as the stilbenes, show promising activity against Gram-positive bacteria when at least one phenolic moiety is present, but not when absent. The potencies of the phenolic phenoxystyrenes and phenothiostyrenes were found to be comparable to those of the phenolic stilbenes tested.
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Affiliation(s)
- M Shahjahan Kabir
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA
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Yoder BJ, Cao S, Norris A, Miller JS, Ratovoson F, Andriantsiferana R, Rasamison VE, Kingston DGI. Tambouranolide, a new cytotoxic hydroxybutanolide from a Tambourissa sp. (Monimiaceae). Nat Prod Res 2007; 21:37-41. [PMID: 17365687 PMCID: PMC2782940 DOI: 10.1080/14786410500445574] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A new cytotoxic hydroxybutanolide, tambouranolide, has been isolated by solid phase extraction from an ethanol extract of the dried roots of a species of Tambourissa (Monimiaceae) from the Madagascar rainforest. The structure was elucidated through the interpretation of spectral data and its comparison to data reported in the literature for related molecules. The compound showed moderate in vitro cytotoxicity with an IC50 of 8 micro g mL(-1) in the A2780 human ovarian cancer cell line assay.
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Affiliation(s)
- Brent J. Yoder
- Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061, USA
| | - Shugeng Cao
- Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061, USA
| | - Andrew Norris
- Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061, USA
| | - James S. Miller
- Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri, 63166-0299, USA
| | | | - Rabodo Andriantsiferana
- Centre National d'Application et Recherches Pharmaceutiques, B. P. 702, Antananarivo 101, Madagascar
| | - Vincent E. Rasamison
- Centre National d'Application et Recherches Pharmaceutiques, B. P. 702, Antananarivo 101, Madagascar
| | - David G. I. Kingston
- Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061, USA
- Corresponding author.
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Williams RB, Norris A, Miller JS, Birkinshaw C, Ratovoson F, Andriantsiferana R, Rasamison VE, Kingston DGI. Cytotoxic clerodane diterpenoids and their hydrolysis products from Casearia nigrescens from the rainforest of Madagascar. JOURNAL OF NATURAL PRODUCTS 2007; 70:206-9. [PMID: 17315961 PMCID: PMC2435182 DOI: 10.1021/np0605034] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Bioassay-guided fractionation of the cytotoxic leaf and flower extract of Casearia nigrescens led to the isolation of four new clerodane diterpenoids, designated caseanigrescens A-D (1-4). These compounds were subject to hydrolysis to dialdehydes when stored in CDCl3. The structures of compounds 1-4 were determined using 1D and 2D NMR spectroscopy. All four compounds showed moderate cytotoxicity to the A2780 human ovarian cancer cell line, with an IC50 range of 0.83-1.4 microM.
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Affiliation(s)
- Russell B. Williams
- Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0212
| | - Andrew Norris
- Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0212
| | - James S. Miller
- Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166-0299
| | - Chris Birkinshaw
- Missouri Botanical Garden, B.P 3391, Antananarivo 101, Madagascar
| | - Fidy Ratovoson
- Missouri Botanical Garden, B.P 3391, Antananarivo 101, Madagascar
| | - Rabodo Andriantsiferana
- Centre National d’Application des Recherches Pharmaceutiques, B.P. 702, Antananarivo 101, Madagascar
| | - Vincent E. Rasamison
- Centre National d’Application des Recherches Pharmaceutiques, B.P. 702, Antananarivo 101, Madagascar
| | - David G. I. Kingston
- Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0212
- To whom correspondence should be addressed. Tel: (540) 231-6570. Fax: (540) 231-7702. E-mail:
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