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Identification of Effective Anticancer G-Quadruplex-Targeting Chemotypes through the Exploration of a High Diversity Library of Natural Compounds. Pharmaceutics 2021; 13:pharmaceutics13101611. [PMID: 34683905 PMCID: PMC8537501 DOI: 10.3390/pharmaceutics13101611] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 09/21/2021] [Accepted: 09/26/2021] [Indexed: 12/14/2022] Open
Abstract
In the quest for selective G-quadruplex (G4)-targeting chemotypes, natural compounds have been thus far poorly explored, though representing appealing candidates due to the high structural diversity of their scaffolds. In this regard, a unique high diversity in-house library composed of ca. one thousand individual natural products was investigated. The combination of molecular docking-based virtual screening and the G4-CPG experimental screening assay proved to be useful to quickly and effectively identify-out of many natural compounds-five hit binders of telomeric and oncogenic G4s, i.e., Bulbocapnine, Chelidonine, Ibogaine, Rotenone and Vomicine. Biophysical studies unambiguously demonstrated the selective interaction of these compounds with G4s compared to duplex DNA. The rationale behind the G4 selective recognition was suggested by molecular dynamics simulations. Indeed, the selected ligands proved to specifically interact with G4 structures due to peculiar interaction patterns, while they were unable to firmly bind to a DNA duplex. From biological assays, Chelidonine and Rotenone emerged as the most active compounds of the series against cancer cells, also showing good selectivity over normal cells. Notably, the anticancer activity correlated well with the ability of the two compounds to target telomeric G4s.
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Rho T, Kil HW, Seo YJ, Shin KJ, Wang D, Yoon KD. Isolation of six anthraquinone diglucosides from cascara sagrada bark by high-performance countercurrent chromatography. J Sep Sci 2020; 43:4036-4046. [PMID: 32876395 DOI: 10.1002/jssc.202000597] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 08/06/2020] [Accepted: 08/31/2020] [Indexed: 11/05/2022]
Abstract
In this study, high-performance countercurrent chromatography was employed to isolate six anthraquinone diglucosides, namely, cascarosides A-F, from cascara sagrada (Rhamnus purshiana DC [Rhamnaceae]) bark. The n-butanol-soluble extract of cascara sagrada was separated by off-line two-dimensional high-performance countercurrent chromatography. The first-dimensional high-performance countercurrent chromatography resolved the n-butanol-soluble extract (510 mg) of cascara sagrada using the flow-rate gradient method with a chloroform-methanol-isopropanol-water (6:6:1:4, v/v/v/v, normal-phase mode) system to afford four anthraquinone diglucoside fractions (groups I [cascarosides C-D, 71 mg], II [cascarosides E-F, 56 mg], III [cascaroside A, 53 mg], and IV [cascaroside B, 31 mg]). Groups I and II were separated by the second-dimensional high-performance countercurrent chromatography using an ethyl acetate-n-butanol-water (7:3:10, v/v/v, normal-phase mode) system to yield cascarosides C (34 mg), D (26 mg), E (19 mg), and F (15 mg). Additionally, one-step preparative-scale high-performance countercurrent chromatography method was developed to isolate large amounts of cascarosides A (389 mg) and B (187 mg) from the water-soluble extract (2.1 g) of cascara sagrada using an ethyl acetate-n-butanol-water (2:8:10, v/v/v, normal-phase mode) system. The current study demonstrated that high-performance countercurrent chromatography is a powerful technique for the isolation of marker compounds from herbal materials.
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Affiliation(s)
- Taewoong Rho
- College of Pharmacy and Integrated Research Institute of Pharmaceutical Sciences, The Catholic University of Korea, Bucheon, Republic of Korea
| | - Hyn Woo Kil
- College of Pharmacy and Integrated Research Institute of Pharmaceutical Sciences, The Catholic University of Korea, Bucheon, Republic of Korea
| | - Young Ju Seo
- College of Pharmacy and Integrated Research Institute of Pharmaceutical Sciences, The Catholic University of Korea, Bucheon, Republic of Korea
| | - Kye Jung Shin
- College of Pharmacy and Integrated Research Institute of Pharmaceutical Sciences, The Catholic University of Korea, Bucheon, Republic of Korea
| | - Daijie Wang
- Shandong Academy of Sciences, Shandong Analysis and Test Center, Shandong, P. R. China
| | - Kee Dong Yoon
- College of Pharmacy and Integrated Research Institute of Pharmaceutical Sciences, The Catholic University of Korea, Bucheon, Republic of Korea
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Demarque DP, Pinho DR, Lopes NP, Merten C. Revisiting empirical rules for the determination of the absolute configuration of cascarosides and other (ox-)anthrones. Chirality 2018; 30:432-438. [DOI: 10.1002/chir.22803] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 11/10/2017] [Accepted: 11/20/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Daniel P. Demarque
- Organic Chemistry 2, Physical Organic Chemistry; Ruhr-University Bochum; Bochum Germany
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto; Universidade de São Paulo; São Paulo Brazil
| | - Danielle R. Pinho
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto; Universidade de São Paulo; São Paulo Brazil
| | - Norberto P. Lopes
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto; Universidade de São Paulo; São Paulo Brazil
| | - Christian Merten
- Organic Chemistry 2, Physical Organic Chemistry; Ruhr-University Bochum; Bochum Germany
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Demarque DP, Pinho DR, Callejon DR, de Oliveira GG, Silva DB, Carollo CA, Lopes NP. New cascarosides from Rhamnus purshiana and fragmentation studies of the class by ion trap mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2017; 31:1169-1174. [PMID: 28440576 DOI: 10.1002/rcm.7883] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 04/05/2017] [Accepted: 04/10/2017] [Indexed: 06/07/2023]
Abstract
RATIONALE Anthrone and oxanthrone are important anthraquinone derivatives present in medicinal plants which are used in therapeutics as laxatives. Some of these plants need to be stored at least one year before they can be used in order to oxidize anthrones into oxanthrones, so to avoid severe diarrhea and dehydration. Therefore, this work aimed to characterize fragmentation reactions between these anthraquinones to provide an easy way to differentiate between the two classes, since it is necessary and important to discriminate and identify these derivatives in laxative plants and phytotherapic drugs. METHODS Anthrone (cascarosides A-D) and oxanthrone (10-hydroxycascaroside A and B) derivatives were isolated and identified by NMR (1 H, 13 C, DEPT, NOESY) and used for fragmentation study by direct infusion on an electrospray ionization (ESI) ion trap mass spectrometer (AmazonSL, Bruker) in positive and negative mode. RESULTS The additional hydroxyl at C-10 in oxanthrones allowed McLafferty-type rearrangements to form the quinone group in positive mode, while in negative mode the second sugar loss infringed the odd-electron rule and formed a radical fragment. No differences in fragmentation reactions were found between diastereoisomeric pairs, although the additional oxygen at C-10 of oxanthrones allowed a different fragmentation pattern. CONCLUSIONS The proposed fragmentation patterns can be used to differentiate anthrones from oxanthrones in both ion modes. In addition, they can be applied to differentiate these compounds in anthraquinone-rich plants and phytotherapic drugs. Finally, herein, the strategy applied allowed us to identify new natural products. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Daniel P Demarque
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Brazil
| | - Danielle R Pinho
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Brazil
| | - Daniel R Callejon
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Brazil
| | - Gibson G de Oliveira
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Brazil
| | - Denise B Silva
- Laboratório de Produtos Naturais e Espectrometria de Massas, Centro de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso do Sul, Campo, Grande-MS, Brazil
| | - Carlos A Carollo
- Laboratório de Produtos Naturais e Espectrometria de Massas, Centro de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso do Sul, Campo, Grande-MS, Brazil
| | - Norberto P Lopes
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Brazil
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Koyama Y, Yamaguchi R, Suzuki K. Total Synthesis and Structure Assignment of the Anthrone C-Glycoside Cassialoin. Angew Chem Int Ed Engl 2008; 47:1084-7. [DOI: 10.1002/anie.200704625] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Koyama Y, Yamaguchi R, Suzuki K. Total Synthesis and Structure Assignment of the Anthrone C-Glycoside Cassialoin. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200704625] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Krenn L, Pradhan R, Presser A, Reznicek G, Kopp B. Anthrone C-glucosides from Rheum emodi. Chem Pharm Bull (Tokyo) 2004; 52:391-3. [PMID: 15056949 DOI: 10.1248/cpb.52.391] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In a study of the anthraderivatives in roots of Rheum emodi, three new anthrone C-glucosides, named 10-hydroxycascaroside C (1), 10-hydroxycascaroside D (2) and 10R-chrysaloin 1-O-beta-D-glucopyranoside (3) were isolated besides the rare compounds cascaroside C (4), cascaroside D (5) and cassialoin (6). Additionally the investigation resulted in the isolation of an acetylated chrysophanol glucoside, 8-O-beta-D-(6'-O-acetyl)glucopyranosyl-chrysophanol (7). The structures were established by comprehensive spectroscopic investigations.
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Jacobs H. Comparative phytochemistry of Picramnia and Alvaradoa, genera of the newly established family Picramniaceae. BIOCHEM SYST ECOL 2003. [DOI: 10.1016/s0305-1978(02)00268-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
From the aerial parts of Cassia kleinii two new oxanthrone esters, kleinioxanthrone-1 and kleinioxanthrone-2 have been isolated. Their structures were established as 1,8-dihydroxy-3-methyl-6-methoxy-9(10H)-anthracenone-10-oxydecanoate 1 and 1,8-dihydroxy-3-methyl-9(10H)-anthracenone-10-oxytetradecanoate 2 respectively based on degradative and spectroscopic evidence.
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Affiliation(s)
- S J Anu
- Organic Chemistry Division, Regional Research Laboratory, Trivandrum, India
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Rodríguez-Gamboa T, Victor SR, Fernandes JB, Fo ER, da Silva MF, Vieira PC, Pagnocca FC, Bueno OC, Hebling MJ, Castro O. Anthrone and oxanthrone C,O-diglycosides from Picramnia teapensis. PHYTOCHEMISTRY 2000; 55:837-841. [PMID: 11190406 DOI: 10.1016/s0031-9422(00)00323-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Two C,O-diglycosylated compounds, the anthrone picramnioside F, and the oxanthrone mayoside C, were isolated from the stem bark of Picramnia teapensis, along with the previously reported anthraquinones, 1-O-beta-D- and 8-O-beta-D-glucopyranosyl emodin. The compounds were separated by recycling-HPLC, and their structures were determined on the basis of spectroscopic analysis. CD measurements were used to establish the absolute configuration of the anthrone and oxanthrone. The antifungal activity of 1-O-beta-D- and 8-O-beta-D-glucopyranosyl emodin against Leucoagaricus gongilophorus was shown to be similar to that of the lignan sesamin.
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Signoretti E, Valvo L, Santucci M, Onori S, Fattibene P, Vincieri F, Mulinacci N. Ionizing radiation induced effects on medicinal vegetable products. Cascara bark. Radiat Phys Chem Oxf Engl 1993 1998. [DOI: 10.1016/s0969-806x(98)00214-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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