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Li X, Zhu DY, Liu XR, Liu HJ, Tang SK, Cai L, Zhao LX. New Analogues of Amides and Quinolinones Produced by Streptomyces sp. YIM S01983. Chem Biodivers 2024; 21:e202400090. [PMID: 38486477 DOI: 10.1002/cbdv.202400090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 03/14/2024] [Indexed: 04/13/2024]
Abstract
Streptomide (1), a new amide analogue, streptomynone (2), a new quinolinone, and ten known compounds including three aliphatic acids (3-5), two amides (6-7), four cyclic dipeptides (8-11), and an adenosine (12) were isolated from the fermentation broth of Streptomyces sp. YIM S01983 isolated from a sediment sample collected in Bendong Village, Huadong Town, Chuxiong, China. Their structures were determined by analysis of the 1D/2D-NMR and HR-ESI-MS spectra. Compound 12 presented weak antimicrobial activities against Candida albicans and Aligenes faecalis (MIC=64 μg/mL). Compounds 7 and 12 showed weak cytotoxic activity against MHCC97H.
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Affiliation(s)
- Xia Li
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Dou-Ying Zhu
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Xi-Ru Liu
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Hong-Jian Liu
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Shu-Kun Tang
- Yunnan Institute of Microbiology, University, Kunming, 650091, P. R.China
| | - Le Cai
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Li-Xing Zhao
- Key Laboratory of Functional Molecules Analysis and Biotransformation of Universities in Yunnan Province, Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
- Yunnan Institute of Microbiology, University, Kunming, 650091, P. R.China
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2
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Dong YL, Li XM, Wang YR, Shi XS, Wang BG, Meng LH. Oxepine-containing pyrazinopyrimidine alkaloids and quinolinone derivatives produced by Aspergillus versicolor AS-212, a deep-sea-derived endozoic fungus. Fitoterapia 2023; 168:105559. [PMID: 37271296 DOI: 10.1016/j.fitote.2023.105559] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/21/2023] [Accepted: 05/30/2023] [Indexed: 06/06/2023]
Abstract
Four new oxepine-containing pyrazinopyrimidine alkaloids, versicoxepines A - D (1-4), two quinolinone alkaloid analogs including 3-hydroxy-6-methoxy-4-phenylquinolin-2(1H)-one (5) and 3-methoxy-6-hydroxy-4-phenylquinolin-2(1H)-one (6) which were new naturally occurring compounds, together with two known compounds (7 and 8) were isolated from Aspergillus versicolor AS-212, an endozoic fungus isolated from the deep-sea coral Hemicorallium cf. imperiale, which was collected from the Magellan Seamounts in the Western Pacific Ocean. Their structures were determined by extensive analysis of the spectroscopic and X-ray crystallographic data as well as by chiral HPLC analysis, ECD calculation, and DP4+ probability prediction. Structurally, versicoxepines B and C (2 and 3) represent the first example of a new oxepine-containing pyrazinopyrimidine alkaloid whose cyclic dipeptide moiety is composed of the same type of amino acid (Val or Ile). Compound 5 displayed antibacterial activity against aquatic pathogens, Vibrio harveyi and V. alginolyticus, with MICs of 8 μg/mL.
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Affiliation(s)
- Yu-Liang Dong
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, People's Republic of China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, People's Republic of China
| | - Xiao-Ming Li
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, People's Republic of China
| | - Yi-Ran Wang
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, People's Republic of China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, People's Republic of China
| | - Xiao-Shan Shi
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, People's Republic of China
| | - Bin-Gui Wang
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, People's Republic of China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, People's Republic of China; Laboratory of Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Wenhai Road 1, Qingdao 266237, People's Republic of China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, People's Republic of China.
| | - Ling-Hong Meng
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, People's Republic of China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, People's Republic of China; Laboratory of Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Wenhai Road 1, Qingdao 266237, People's Republic of China.
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Saepua S, Kornsakulkarn J, Choowong W, Suriyachadkun C, Boonlarppradab C, Thongpanchang C. Antimicrobial and Cytotoxic Angucyclic Quinones from Actinomadura miaoliensis. J Nat Prod 2021; 84:2775-2785. [PMID: 34748348 DOI: 10.1021/acs.jnatprod.1c00232] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Eight new angucyclic quinones, miaosporones A to H (1-8), along with the previously described metabolites 8-hydroxy-3-methylbenz[a]anthraquinone (9), tetrangulol (10), 5,6-dihydro-1,8-dihydroxy-3-methybenz[a]anthracene-7,12-quinone (11), and SF2315A (12), were isolated from the terrestrial actinomycete Actinomadura miaoliensis TBRC 5172 obtained from sediment collected from the Huai Yang reservoir, Prachuap Khiri Khan Province, Thailand. The relative and absolute configurations of the new compounds were determined from analysis of NMR spectroscopic and X-ray crystallographic data. Miaosporone A exhibited antimalarial activity against Plasmodium falciparum K1 and antibacterial activity against Mycobacterium tuberculosis with respective IC50 values of 2.5 and 2.4 μM and displayed cytotoxic activities against both cancerous (MCF-7 and NCI-H187) and nonmalignant (Vero) cells.
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Affiliation(s)
- Siriporn Saepua
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Jittra Kornsakulkarn
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Wilunda Choowong
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Chanwit Suriyachadkun
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Chollaratt Boonlarppradab
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
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4
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Dai C, Li X, Zhang K, Li XN, Wang W, Zang Y, Chen X, Li Q, Wei M, Chen C, Zhu H, Zhang Y. Pesimquinolones I-S, eleven new quinolone alkaloids produced by Penicillium simplicissimum and their inhibitory activity on NO production. Bioorg Chem 2021; 108:104635. [PMID: 33484940 DOI: 10.1016/j.bioorg.2021.104635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 01/04/2021] [Accepted: 01/04/2021] [Indexed: 11/17/2022]
Abstract
Eleven undescribed quinolone alkaloids, pesimquinolones I-S (1-4 and 6-12), as well as eleven known congeners (5 and 13-22), were isolated from the solid culture broth of the fungus Penicillium simplicissimum. Their chemical structures with absolute configurations were established by a combination of NMR spectroscopy, single-crystal X-ray crystallography, and modified Mosher's methods. Pesimquinolones I-K (1-3) represent the first examples of natural occurring quinolone alkaloids that possess a 6/6/6/6 tetracyclic ring system. The anti-inflammatory activities of selected compounds on LPS-induced nitric oxide (NO) production in adherent cells were evaluated. Compounds 1 and 2 showed suppressive effects on the production of NO, with IC50 values of 10.13 and 8.10 μM, respectively.
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Affiliation(s)
- Chong Dai
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Xiaoxin Li
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Kailin Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China; Hubei Hualong Bio-Chemical Pharmaceutical Limited Company, Xiaogan 432800, People's Republic of China
| | - Xiao-Nian Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China
| | - Wenjing Wang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Yi Zang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Xia Chen
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Qin Li
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Mengsha Wei
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Chunmei Chen
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Hucheng Zhu
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China.
| | - Yonghui Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China.
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5
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Li Q, Chen C, He Y, Wei M, Cheng L, Kang X, Wang J, Hao X, Zhu H, Zhang Y. Prenylated quinolinone alkaloids and prenylated isoindolinone alkaloids from the fungus Aspergillus nidulans. Phytochemistry 2020; 169:112177. [PMID: 31707275 DOI: 10.1016/j.phytochem.2019.112177] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 09/17/2019] [Accepted: 10/10/2019] [Indexed: 06/10/2023]
Abstract
Two undescribed prenylated quinolinone alkaloids, aspoquinolones E and F, and three undescribed prenylated isoindolinone alkaloids aspernidines F-H, were isolated from the fungus Aspergillus nidulans. Their structures and configurations were elucidated based on spectroscopic analyses and ECD spectra. Aspoquinolones E and F possess a C10 moiety with an unusual 2,2,4-trimethyl-3oxa-bicyclo[3.1.0]hexane unit, and aspernidines F-H own a C15 side chain. These compounds were evaluated for cytotoxic activities against five human cancer cell lines, compounds 1 and 5 exhibited strong inhibitory activities against A-549 and SW-480 cells with IC50 values of 3.50 and 4.77 μM, respectively.
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Affiliation(s)
- Qin Li
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Chunmei Chen
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Yan He
- Department of Pharmacy, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Mengsha Wei
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Li Cheng
- Hubei Key Laboratory of Wudang Local Chinese Medicine Research, Hubei Engineering Technology Center for Comprehensive Utilization of Medicinal Plants, College of Pharmacy, Hubei University of Medicine, Shiyan, 442000, People's Republic of China
| | - Xin Kang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Jianping Wang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Xincai Hao
- Hubei Key Laboratory of Wudang Local Chinese Medicine Research, Hubei Engineering Technology Center for Comprehensive Utilization of Medicinal Plants, College of Pharmacy, Hubei University of Medicine, Shiyan, 442000, People's Republic of China.
| | - Hucheng Zhu
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China.
| | - Yonghui Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China.
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El-Kashef DH, Daletos G, Plenker M, Hartmann R, Mándi A, Kurtán T, Weber H, Lin W, Ancheeva E, Proksch P. Polyketides and a Dihydroquinolone Alkaloid from a Marine-Derived Strain of the Fungus Metarhizium marquandii. J Nat Prod 2019; 82:2460-2469. [PMID: 31432669 DOI: 10.1021/acs.jnatprod.9b00125] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Three new natural products (1-3), including two butenolide derivatives (1 and 2) and one dihydroquinolone derivative (3), together with nine known natural products were isolated from a marine-derived strain of the fungus Metarhizium marquandii. The structures of the new compounds were unambiguously deduced by spectroscopic means including HRESIMS and 1D/2D NMR spectroscopy, ECD, VCD, OR measurements, and calculations. The absolute configuration of marqualide (1) was determined by a combination of modified Mosher's method with TDDFT-ECD calculations at different levels, which revealed the importance of intramolecular hydrogen bonding in determining the ECD features. The (3R,4R) absolute configuration of aflaquinolone I (3), determined by OR, ECD, and VCD calculations, was found to be opposite of the (3S,4S) absolute configuration of the related aflaquinolones A-G, suggesting that the fungus M. marquandii produces aflaquinolone I with a different configuration (chiral switching). The absolute configuration of the known natural product terrestric acid hydrate (4) was likewise determined for the first time in this study. TDDFT-ECD calculations allowed determination of the absolute configuration of its chirality center remote from the stereogenic unsaturated γ-lactone chromophore. ECD calculations aided by solvent models revealed the importance of intramolecular hydrogen bond networks in stabilizing conformers and determining relationships between ECD transitions and absolute configurations.
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Affiliation(s)
- Dina H El-Kashef
- Institut für Pharmazeutische Biologie und Biotechnologie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
- Department of Pharmacognosy, Faculty of Pharmacy , Minia University , 61519 Minia , Egypt
| | - Georgios Daletos
- Institut für Pharmazeutische Biologie und Biotechnologie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
| | - Malte Plenker
- Institute of Complex Systems: Strukturbiochemie , Forschungszentrum Jülich GmbH , ICS-6, 52425 Jülich , Germany
| | - Rudolf Hartmann
- Institute of Complex Systems: Strukturbiochemie , Forschungszentrum Jülich GmbH , ICS-6, 52425 Jülich , Germany
| | - Attila Mándi
- Department of Organic Chemistry , University of Debrecen , P.O.B. 400, 4002 Debrecen , Hungary
| | - Tibor Kurtán
- Department of Organic Chemistry , University of Debrecen , P.O.B. 400, 4002 Debrecen , Hungary
| | - Horst Weber
- Institut für Pharmazeutische und Medizinische Chemie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
| | - Wenhan Lin
- State Key Laboratory of Natural and Biomimetic Drugs , Peking University , Beijing 100191 , China
| | - Elena Ancheeva
- Institut für Pharmazeutische Biologie und Biotechnologie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
| | - Peter Proksch
- Institut für Pharmazeutische Biologie und Biotechnologie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
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Ecoy GAU, Chamni S, Suwanborirux K, Chanvorachote P, Chaotham C. Jorunnamycin A from Xestospongia sp. Suppresses Epithelial to Mesenchymal Transition and Sensitizes Anoikis in Human Lung Cancer Cells. J Nat Prod 2019; 82:1861-1873. [PMID: 31260310 DOI: 10.1021/acs.jnatprod.9b00102] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Metastasis is a key driving force behind the high mortality rate associated with lung cancer. Herein, we report the first study revealing the antimetastasis activity of jorunnamycin A, a bistetrahydroisoquinolinequinone isolated from a Thai blue sponge Xestospongia sp. evidenced by its inhibition of epithelial to mesenchymal transition (EMT), sensitization of anoikis, and suppression of anchorage-independent survival in human lung cancer cells. Treatment with jorunnamycin A (0.05-0.5 μM) altered the expression of p53 and Bcl-2 family proteins, particularly causing the down-regulation of antiapoptosis Bcl-2 and Mcl-1 proteins. Under detachment conditions for 12 h, jorunnamycin A-treated cells exhibited diminution of pro-survival proteins p-Akt and p-Erk as well as the survival-promoting factor caveolin-1. Corresponding with the inhibition on the Akt and Erk pathway as well as activation of p53, there was an increase in the epithelial marker E-cadherin and a remarkable decrease of EMT markers and associated proteins including vimentin, snail, and claudin-1. As the loss of anchorage dependence is an important barrier to metastasis, the observed inhibitory effects of jorunnamycin A on the coordinating networks of EMT and anchorage-independent growth emphasize the potential development of jorunnamycin A as an effective agent against lung cancer metastasis.
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Abdel-Wahab NM, Scharf S, Özkaya FC, Kurtán T, Mándi A, Fouad MA, Kamel MS, Müller WEG, Kalscheuer R, Lin W, Daletos G, Ebrahim W, Liu Z, Proksch P. Induction of Secondary Metabolites from the Marine-Derived Fungus Aspergillus versicolor through Co-cultivation with Bacillus subtilis. Planta Med 2019; 85:503-512. [PMID: 30699456 DOI: 10.1055/a-0835-2332] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A new cyclic pentapeptide, cotteslosin C (1: ), a new aflaquinolone, 22-epi-aflaquinolone B (3: ), and two new anthraquinones (9: and 10: ), along with thirty known compounds (2, 4: - 8, 11: - 34: ) were isolated from a co-culture of the sponge-associated fungus Aspergillus versicolor with Bacillus subtilis. The new metabolites were only detected in the co-culture extract, but not when the fungus was grown under axenic conditions. Furthermore, the co-culture extract exhibited an enhanced accumulation of the known constituents versicolorin B (14: ), averufin (16: ), and sterigmatocyctin (19: ) by factors of 1.5, 2.0, and 4.7, respectively, compared to the axenic fungal culture. The structures of the isolated compounds were elucidated on the basis of 1D and 2D NMR spectra and mass spectrometry as well as by comparison with literature data. The absolute configuration of compounds 3, 9: , and 10: was determined by ECD (electronic circular dichroism) analysis aided by TDDFT-ECD (time-dependent density functional theory electronic circular dichroism) calculations. Compounds 15, 18: - 21: , and 26: exhibited strong to moderate cytotoxic activity against the mouse lymphoma cell line L5178Y, with IC50 values ranging from 2.0 to 21.2 µM, while compounds 14, 16, 31, 32: , and 33: displayed moderate inhibitory activities against several gram-positive bacteria, with MIC values ranging from 12.5 to 50 µM.
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Affiliation(s)
- Nada M Abdel-Wahab
- Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, Minia, Egypt
| | - Sebastian Scharf
- Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Ferhat C Özkaya
- Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Tibor Kurtán
- Department of Organic Chemistry, University of Debrecen, Debrecen, Hungary
| | - Attila Mándi
- Department of Organic Chemistry, University of Debrecen, Debrecen, Hungary
| | - Mostafa A Fouad
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, Minia, Egypt
| | - Mohamed S Kamel
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, Minia, Egypt
- Department of Pharmacognosy, Faculty of Pharmacy, Deraya University, New Minia, Egypt
| | - Werner E G Müller
- Institut für Physiologische Chemie, Universitätsmedizin der Johannes-Gutenberg-Universität Mainz, Mainz, Germany
| | - Rainer Kalscheuer
- Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Wenhan Lin
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Georgios Daletos
- Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Weaam Ebrahim
- Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Zhen Liu
- Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Peter Proksch
- Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
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9
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Rodríguez Estévez M, Myronovskyi M, Gummerlich N, Nadmid S, Luzhetskyy A. Heterologous Expression of the Nybomycin Gene Cluster from the Marine Strain Streptomyces albus subsp. chlorinus NRRL B-24108. Mar Drugs 2018; 16:md16110435. [PMID: 30400361 PMCID: PMC6265801 DOI: 10.3390/md16110435] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 10/26/2018] [Accepted: 10/31/2018] [Indexed: 11/16/2022] Open
Abstract
Streptomycetes represent an important reservoir of active secondary metabolites with potential applications in the pharmaceutical industry. The gene clusters responsible for their production are often cryptic under laboratory growth conditions. Characterization of these clusters is therefore essential for the discovery of new microbial pharmaceutical drugs. Here, we report the identification of the previously uncharacterized nybomycin gene cluster from the marine actinomycete Streptomyces albus subsp. chlorinus through its heterologous expression. Nybomycin has previously been reported to act against quinolone-resistant Staphylococcus aureus strains harboring a mutated gyrA gene but not against those with intact gyrA. The nybomycin-resistant mutants generated from quinolone-resistant mutants have been reported to be caused by a back-mutation in the gyrA gene that restores susceptibility to quinolones. On the basis of gene function assignment from bioinformatics analysis, we suggest a model for nybomycin biosynthesis.
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Affiliation(s)
| | - Maksym Myronovskyi
- Pharmazeutische Biotechnologie, Universität des Saarlandes, 66123 Saarbrücken, Germany.
| | - Nils Gummerlich
- Pharmazeutische Biotechnologie, Universität des Saarlandes, 66123 Saarbrücken, Germany.
| | - Suvd Nadmid
- Pharmazeutische Biotechnologie, Universität des Saarlandes, 66123 Saarbrücken, Germany.
| | - Andriy Luzhetskyy
- Pharmazeutische Biotechnologie, Universität des Saarlandes, 66123 Saarbrücken, Germany.
- Helmholtz-Institut für Pharmazeutische Forschung Saarland, 66123 Saarbrücken, Germany.
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10
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Ali I, Suhail M, Asnin L. Chiral separation and modeling of quinolones on teicoplanin macrocyclic glycopeptide antibiotics CSP. Chirality 2018; 30:1304-1311. [PMID: 30321474 DOI: 10.1002/chir.23024] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 07/28/2018] [Accepted: 08/30/2018] [Indexed: 11/07/2022]
Abstract
New chiral high-performance liquid chromatography (HPLC) method for the enantiomeric resolution of quinolones is developed and described. The column used was Chirobiotic T (150 × 4.6 mm, 5.0 μm). Three mobile phases used were MeOH:ACN:Water:TEA (70:10:20:0.1%), (60:30:10:0.1%), and (50:30:20:0.1%). The flow rate of the mobile phases was 1.0 mL/min with UV detection at different wavelengths. The values of retention, resolution, and separation factors ranged from 1.5 to 6.0, 1.80 to 2.25, and 2.86 to 6.0, respectively. The limit of detection and quantification ranged from 4.0 to 12 ng and 40 to 52 ng, respectively. The modeling studies indicated strong interactions of R-enantiomers with teicoplanin chiral selector than S-enantiomers. The supra molecular mechanism of the chiral recognition was established by modeling and chromatographic studies. It was observed that hydrogen bondings and π-π interactions are the major forces for chiral separation. The present chiral HPLC method may be used for enantiomeric resolution of quinolones in any matrices.
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Affiliation(s)
- Imran Ali
- Department of Chemistry, Jamia Millia Islamia Central University, New Delhi, India
- Department of Chemistry, College of Sciences, Taibah University, Al-Medina, Saudi Arabia
| | - Mohd Suhail
- Department of Chemistry, Jamia Millia Islamia Central University, New Delhi, India
| | - Leonid Asnin
- Perm National Research Polytechnic University, Perm, Russia
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11
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Liu FA, Lin X, Zhou X, Chen M, Huang X, Yang B, Tao H. Xanthones and Quinolones Derivatives Produced by the Deep-Sea-Derived Fungus Penicillium sp. SCSIO Ind16F01. Molecules 2017; 22:molecules22121999. [PMID: 29215585 PMCID: PMC6149711 DOI: 10.3390/molecules22121999] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 11/08/2017] [Accepted: 11/16/2017] [Indexed: 11/26/2022] Open
Abstract
Chemical investigation of the fungus Penicillium sp. SCSIO Ind16F01 derived from deep-sea sediment sample afforded a new xanthone, 3,8-dihydroxy-2-methyl-9-oxoxanthene-4-carboxylic acid methyl ester (1) and a new chromone, coniochaetone J (2), together with three known xanthones, 8-hydroxy-6-methyl-9-oxo-9H-xanthene-1-carboxylic acid methyl ester (3), 7,8-dihydroxy-6-methyl-9-oxo-9H-xanthene-1-carboxylic acid methyl ester (4), 1,6,8-trihydroxy-3-(hydroxymethyl)anthraquinone (5), three known chromones, coniochaetone B (6), citrinolactones B (7), epiremisporine B (8), and four reported rare class of N-methyl quinolone lactams: quinolactacins B (9), C1 (10), and C2 (11), and quinolonimide (12). The structures of new compounds were determined by analysis of the NMR and MS spectroscopic data. Those isolated compounds were evaluated for their antiviral (EV71 and H3N2) and cytotoxic activities.
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Affiliation(s)
- Feng-An Liu
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China.
| | - Xiuping Lin
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology/Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
| | - Xuefeng Zhou
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology/Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
| | - Minghao Chen
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China.
| | - Xiuling Huang
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China.
| | - Bin Yang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology/Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
| | - Huaming Tao
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China.
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12
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Huang BX, Newcomer K, Kevala K, Barnaeva E, Zheng W, Hu X, Patnaik S, Southall N, Marugan J, Ferrer M, Kim HY. Identification of 4-phenylquinolin-2(1H)-one as a specific allosteric inhibitor of Akt. Sci Rep 2017; 7:11673. [PMID: 28916818 PMCID: PMC5601486 DOI: 10.1038/s41598-017-11870-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 08/31/2017] [Indexed: 12/28/2022] Open
Abstract
Akt plays a major role in tumorigenesis and the development of specific Akt inhibitors as effective cancer therapeutics has been challenging. Here, we report the identification of a highly specific allosteric inhibitor of Akt through a FRET-based high-throughput screening, and characterization of its inhibitory mechanism. Out of 373,868 compounds screened, 4-phenylquinolin-2(1H)-one specifically decreased Akt phosphorylation at both T308 and S473, and inhibited Akt kinase activity (IC50 = 6 µM) and downstream signaling. 4-Phenylquinolin-2(1H)-one did not alter the activity of upstream kinases including PI3K, PDK1, and mTORC2 as well as closely related kinases that affect cell proliferation and survival such as SGK1, PKA, PKC, or ERK1/2. This compound inhibited the proliferation of cancer cells but displayed less toxicity compared to inhibitors of PI3K or mTOR. Kinase profiling efforts revealed that 4-phenylquinolin-2(1H)-one does not bind to the kinase active site of over 380 human kinases including Akt. However, 4-phenylquinolin-2(1H)-one interacted with the PH domain of Akt, apparently inducing a conformation that hinders S473 and T308 phosphorylation by mTORC2 and PDK1. In conclusion, we demonstrate that 4-phenylquinolin-2(1H)-one is an exquisitely selective Akt inhibitor with a distinctive molecular mechanism, and a promising lead compound for further optimization toward the development of novel cancer therapeutics.
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Affiliation(s)
- Bill X Huang
- Laboratory of Molecular Signaling, National Institute of Alcohol Abuse and Alcoholism, NIH, 5625 Fishers Lane, Rockville, MD, 20852, USA
| | - Kenny Newcomer
- Laboratory of Molecular Signaling, National Institute of Alcohol Abuse and Alcoholism, NIH, 5625 Fishers Lane, Rockville, MD, 20852, USA
| | - Karl Kevala
- Laboratory of Molecular Signaling, National Institute of Alcohol Abuse and Alcoholism, NIH, 5625 Fishers Lane, Rockville, MD, 20852, USA
| | - Elena Barnaeva
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, 9800 Medical Center Dr., Rockville, MD, 20850, USA
| | - Wei Zheng
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, 9800 Medical Center Dr., Rockville, MD, 20850, USA
| | - Xin Hu
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, 9800 Medical Center Dr., Rockville, MD, 20850, USA
| | - Samarjit Patnaik
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, 9800 Medical Center Dr., Rockville, MD, 20850, USA
| | - Noel Southall
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, 9800 Medical Center Dr., Rockville, MD, 20850, USA
| | - Juan Marugan
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, 9800 Medical Center Dr., Rockville, MD, 20850, USA
| | - Marc Ferrer
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, 9800 Medical Center Dr., Rockville, MD, 20850, USA
| | - Hee-Yong Kim
- Laboratory of Molecular Signaling, National Institute of Alcohol Abuse and Alcoholism, NIH, 5625 Fishers Lane, Rockville, MD, 20852, USA.
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13
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Ahmed MJ. Adsorption of quinolone, tetracycline, and penicillin antibiotics from aqueous solution using activated carbons: Review. Environ Toxicol Pharmacol 2017; 50:1-10. [PMID: 28103518 DOI: 10.1016/j.etap.2017.01.004] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Revised: 12/24/2016] [Accepted: 01/10/2017] [Indexed: 05/15/2023]
Abstract
Antibiotics, an important type of pharmaceutical pollutant, have attracted many researchers to the study of their removal from aqueous solutions. Activated carbon (AC) has been widely used as highly effective adsorbent for antibiotics because of its large specific surface area, high porosity, and favorable pore size distribution. In this article, the adsorption performance of AC towards three major types of antibiotics such as tetracyclines, quinolones, and penicillins were reviewed. According to collected data, maximum adsorption capacities of 1340.8, 638.6, and 570.4mg/g were reported for tetracyclines, quinolones, and penicillins, respectively. The values of 1/n for Freundlich isotherm were less than unity, suggesting that the adsorption was nonlinear and favorable. Adsorption kinetics followed closely the pseudo-second-order model and analysis using the Weber-Morris model revealed that the intra-particle diffusion was not the only rate controlling step. AC adsorption demonstrated superior performance for all selected drugs, thus being efficient technology for treatment of these pollutants.
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Affiliation(s)
- Muthanna J Ahmed
- Department of Chemical Engineering, University of Baghdad, P.O. Box 47024, Aljadria, Baghdad, Iraq.
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14
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Shao CL, Xu RF, Wang CY, Qian PY, Wang KL, Wei MY. Potent Antifouling Marine Dihydroquinolin-2(1H)-one-Containing Alkaloids from the Gorgonian Coral-Derived Fungus Scopulariopsis sp. Mar Biotechnol (NY) 2015; 17:408-415. [PMID: 25833409 DOI: 10.1007/s10126-015-9628-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 01/28/2015] [Indexed: 06/04/2023]
Abstract
Marine biofouling has a major economic impact, especially when it occurs on ship hulls or aquaculture facilities. Since the International Maritime Organization (IMO) treaty to ban the application of organotin-based paints to ships went into effect in 2008, there is an urgent demand for the development of efficient and environmentally friendly antifouling agents. Marine microorganisms have proved to be a potential source of antifouling natural compounds. In this study, six dihydroquinolin-2-one-containing alkaloids, three monoterpenoids combined with a 4-phenyl-3,4-dihydroquinolin-2(1H)-one (1-3) and three 4-phenyl-3,4-dihydroquinolin-2(1H)-one alkaloids (4-6), were isolated from the gorgonian coral-derived fungus Scopulariopsis sp. collected in the South China Sea. These dihydroquinolin-2-one-containing alkaloids were evaluated against the larval settlement of barnacle Balanus amphitrite, and antifouling activity was detected for the first time for this class of metabolites. All of them except 6 showed strong antifouling activity. Compounds 1 and 2 were discovered to be the most promising non-toxic antilarval settlement candidates. Especially, compound 1 is the strongest antifouling compound in nature until now which showed highly potent activity with picomolar level (EC50 17.5 pM) and a very safety and high therapeutic ratio (LC50/EC50 1200). This represents an effective non-toxic, anti-larval settlement structural class of promising antifouling lead compound.
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Affiliation(s)
- Chang-Lun Shao
- Key Laboratory of Marine Drugs, The Ministry Education of China, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao, 266003, People's Republic of China,
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15
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Zhao N, Li ZL, Li DH, Sun YT, Shan DT, Bai J, Pei YH, Jing YK, Hua HM. Quinolone and indole alkaloids from the fruits of Euodia rutaecarpa and their cytotoxicity against two human cancer cell lines. Phytochemistry 2015; 109:133-139. [PMID: 25457491 DOI: 10.1016/j.phytochem.2014.10.020] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 07/11/2014] [Accepted: 10/16/2014] [Indexed: 06/04/2023]
Abstract
Four quinolone alkaloids (1-4) and three indole alkaloids (20-22), together with 30 known alkaloids (5-19, 23-37), were isolated from the fruits of Euodia rutaecarpa. Their structures were established by spectroscopic analyses. The in vitro cytotoxic activities of these alkaloids against leukaemia HL-60 and prostate cancer PC-3 cell lines were evaluated.
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Affiliation(s)
- Nan Zhao
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Zhan-Lin Li
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China.
| | - Da-Hong Li
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Ya-Ting Sun
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Dong-Ting Shan
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Jiao Bai
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Yue-Hu Pei
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Yong-Kui Jing
- Department of Medicine, Mount Sinai School of Medicine, New York, NY 10029, USA
| | - Hui-Ming Hua
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, PR China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, PR China.
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16
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Chen M, Shao CL, Meng H, She ZG, Wang CY. Anti-respiratory syncytial virus prenylated dihydroquinolone derivatives from the gorgonian-derived fungus Aspergillus sp. XS-20090B15. J Nat Prod 2014; 77:2720-2724. [PMID: 25420212 DOI: 10.1021/np500650t] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Two new prenylated dihydroquinolone derivatives, 22-O-(N-Me-l-valyl)aflaquinolone B (1) and 22-O-(N-Me-l-valyl)-21-epi-aflaquinolone B (2), and two known analogues, aflaquinolones A (3) and D (or a diastereomer of D, 4), were isolated from the mycelia of a gorgonian-derived Aspergillus sp. fungus. The structures of the new compounds were elucidated by spectroscopic methods, ECD spectra, Marfey's method, and chemical conversion. Compounds 1 and 2 display an unusual esterification of N-Me-l-Val to the side-chain prenyl group. Compound 2 exhibited outstanding anti-RSV activity with an IC50 value of 42 nM, approximately 500-fold stronger than that of the positive control ribavirin (IC50 = 20 μM), and showed a comparatively higher therapeutic ratio (TC50/IC50 = 520).
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Affiliation(s)
- Min Chen
- Key Laboratory of Marine Drugs, The Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, People's Republic of China
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17
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Bogdanov MG, Kandinska MI, Dimitrova DB, Gocheva BT, Palamareva MD. Preliminary Evaluation of Antimicrobial Activity of Diastereomeric cis/trans-3-Aryl(Heteroaryl)-3,4-dihydroisocoumarin-4-carboxylic Acids. ACTA ACUST UNITED AC 2014; 62:477-82. [PMID: 17913060 DOI: 10.1515/znc-2007-7-804] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Preliminary differentiating screening of the antibacterial and antifungal activity of a series of diastereomeric cis/trans-3-aryl(heteroaryl)-3,4-dihydroisocoumarin-4-carboxylic acids (3a- i) was performed by the agar diffusion method against twelve microorganism strains of different taxonomic groups. S. aureus and A. niger were the most sensitive strains to the antibiotic effect of the tested compounds, both inhibited by 10 of 12 compounds. The most potent antibacterial agent was cis-3-phenyl-3,4-dihydroisocoumarin-4-carboxylic acid (cis-3a), exhibiting activity against all seven bacterial test strains
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Affiliation(s)
- Milen G Bogdanov
- Faculty of Chemistry, Sofia University, 1, J. Bourchier Blvd., 1164 Sofia, Bulgaria.
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18
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Abstract
Biosensors are biological tools that can be used to assay bacterial cultures for quorum sensing signal molecules (QSSMs) both qualitatively and semiquantitatively. QSSMs can be extracted from Pseudomonas aeruginosa cultures using organic solvents and tentatively identified via thin layer chromatography in combination with biosensor overlays. Alternatively, QSSMs can be quantified in spent culture supernatants or solvent extracts using biosensor-based spectrophotometric, luminescence, or fluorescence assays.
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Affiliation(s)
- Matthew Fletcher
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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19
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An CY, Li XM, Luo H, Li CS, Wang MH, Xu GM, Wang BG. 4-Phenyl-3,4-dihydroquinolone derivatives from Aspergillus nidulans MA-143, an endophytic fungus isolated from the mangrove plant Rhizophora stylosa. J Nat Prod 2013; 76:1896-1901. [PMID: 24099304 DOI: 10.1021/np4004646] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Six new 4-phenyl-3,4-dihydroquinolone derivatives (1-6) along with the related aflaquinolone A (7) were isolated and identified from the cultures of Aspergillus nidulans MA-143, an endophytic fungus obtained from the fresh leaves of the marine mangrove plant Rhizophora stylosa. Their structures including absolute configurations were determined by spectroscopic analysis and electronic circular dichroism experiments, and the structure of compound 1 was confirmed by single-crystal X-ray crystallographic analysis. In bioscreening experiments, none of the isolated compounds showed potent antibacterial or cytotoxic activity. However, compounds 2, 3, and 7 exhibited lethality against brine shrimp (Artemia salina), with LD50 values of 7.1, 4.5, and 5.5 μM, respectively.
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Affiliation(s)
- Chun-Yan An
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences , Nanhai Road 7, Qingdao 266071, People's Republic of China
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20
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Gan M, Liu Y, Bai Y, Guan Y, Li L, Gao R, He W, You X, Li Y, Yu L, Xiao C. Polyketides with New Delhi metallo-β-lactamase 1 inhibitory activity from Penicillium sp. J Nat Prod 2013; 76:1535-1540. [PMID: 23972215 DOI: 10.1021/np4000944] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Three new polyketide compounds (1-3), a new quinolone alkaloid (4), and seven known polyketide derivatives were identified from the cultures of Penicillium sp. I09F 484, a strain isolated from the rhizosphere soil of the plant Picea asperata from Kanas Lake, Xinjiang, China. Their structures were elucidated by extensive spectroscopic data analysis. The absolute configurations of 1 and 4 were established by quantum chemical time-dependent density functional theory electronic circular dichroism calculation and Marfey's method, respectively. Compounds 1 and 2 displayed inhibitory activity against New Delhi metallo-β-lactamase 1 with IC₅₀ values of 94.9 and 87.9 μM, respectively.
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Affiliation(s)
- Maoluo Gan
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050, People's Republic of China
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21
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Zhang C, Ning K, Zhang W, Guo Y, Chen J, Liang C. Determination and removal of antibiotics in secondary effluent using a horizontal subsurface flow constructed wetland. Environ Sci Process Impacts 2013; 15:709-714. [PMID: 23478629 DOI: 10.1039/c3em00033h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Increased attention is currently being directed towards the potential negative effects of antibiotics and other PPCPs discharged into the aquatic environment via municipal WWTP secondary effluents. A number of analytical methods, such as high performance liquid chromatography technologies, including a high performance liquid chromatography-fluorescence method (HPLC-FLD), high performance liquid chromatography-UV detection method (HPLC-UV) and high performance liquid chromatography-mass spectrometry method (HPLC-MS), have been suggested as determination technologies for antibiotic residues in water. In this study, we implement a HPLC-MS/MS combined method to detect and analyze antibiotics in WWTP secondary effluent and apply a horizontal subsurface flow constructed wetland (CW) as an advanced wastewater treatment for removing antibiotics in the WWTP secondary effluent. The results show that there were 2 macrolides, 2 quinolones and 5 sulfas in WWTP secondary effluent among all the 22 antibiotics considered. After the CW advanced treatment, the concentration removal efficiencies and removal loads of 9 antibiotics were 53-100% and 0.004-0.7307 μg m(-2) per day, respectively.
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Affiliation(s)
- Chunhui Zhang
- School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing 100083, China.
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22
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Abstract
Two new compounds, 5β-pregnane-2α,6α,20(S)-triol (1) and 8-hydroxyl-3-methoxyl-2(1H)-quinolone (2), were isolated from Scolopendra multidens Newport. Their structures were elucidated on the basis of spectroscopic methods including 1D and 2D NMR and HR-TOF-MS.
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Affiliation(s)
- Yin-Dan Fu
- State Key Laboratory of Natural Medicines, Research Department of Pharmacognosy, China Pharmaceutical University, Nanjing 211198, China
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23
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Dorival-García N, Zafra-Gómez A, Navalón A, González J, Vílchez JL. Removal of quinolone antibiotics from wastewaters by sorption and biological degradation in laboratory-scale membrane bioreactors. Sci Total Environ 2013; 442:317-328. [PMID: 23178836 DOI: 10.1016/j.scitotenv.2012.10.026] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Revised: 09/26/2012] [Accepted: 10/04/2012] [Indexed: 05/24/2023]
Abstract
Laboratory-scale batch experiments were developed to investigate the main removal routes for 6 commonly found quinolones (ciprofloxacin, moxifloxacin, norfloxacin, ofloxacin, pipemidic acid, and piromidic acid), in wastewaters from a wastewater treatment plant, at μg L(-1) levels in an aerobic sludge system from a membrane bioreactor (MBR) pilot plant. It was demonstrated that sorption and biotransformation were the main removal routes for the target antibiotics over other possible pathways, as volatilization or hydrolysis, under the experimental conditions. Mass balances indicated that sorption on sludge played a dominant role in the elimination of antibiotics from waters. The sorption coefficient K(d) depended strongly on temperature and on the quinolone type and were higher at lower temperatures and for piperazinylic quinolones. K(d) values were between 516 and 3746 L kg(-1) in the temperature range of 9-38°C. Higher mixed liquor suspended solids (MLSS) increased quinolone removal efficiency mainly by sorption. Quinolone biodegradation constituted a secondary pathway, and could be described by first-order kinetics with degradation-rate constants ranging from 8.0 × 10(-4)h(-1) to 1.4 × 10(-2)h(-1) within the same temperature range and MLSS from 7000 to 15,000 mg L(-1). Biodegradation depended on the MLSS and temperature, but also on the initial chemical oxygen demand (COD). Higher biodegradation rates were observed at higher MLSS and temperature, as well as at low initial COD. Ciprofloxacin and moxifloxacin registered the highest biodegradation percentages (52.8% and 47.2%, respectively, at 38°C and 15,000 mg L(-1) MLSS), which is evidence that, despite the known persistence of this group of antibiotics and removal from waters mainly by sorption, it was possible to improve their removal by biodegradation, with an appropriate selection of conditions and control of process variables, as a preliminary step towards the elimination of these antibiotics from the environment. Further research is needed on the possibilities of removing sorbed antibiotics from sludge.
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Affiliation(s)
- N Dorival-García
- Research Group of Analytical Chemistry and Life Sciences, Department of Analytical Chemistry, Campus of Fuentenueva, University of Granada, E-18071 Granada, Spain
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24
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Sinha S, Mishra P, Amin H, Rah B, Nayak D, Goswami A, Kumar N, Vishwakarma R, Ghosal S. A new cytotoxic quinolone alkaloid and a pentacyclic steroidal glycoside from the stem bark of Crataeva nurvala: study of anti-proliferative and apoptosis inducing property. Eur J Med Chem 2012; 60:490-6. [PMID: 23354071 DOI: 10.1016/j.ejmech.2012.12.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2012] [Revised: 12/05/2012] [Accepted: 12/08/2012] [Indexed: 11/18/2022]
Abstract
Chemical investigation of stem bark of Crataeva nurvala afforded 5,7-dimethoxy-3-phenyl-1-ethyl-1,4-dihydro-4-quinolone and a steroidal glycoside with unprecedented pentacyclic ring system named crataemine (1a) and crataenoside (2) respectively. The structures of the compounds were determined by spectroscopic analysis. A series of compounds with modification at position 1 of 1a (1a-1c) were prepared. All compounds were screened for cytotoxic activity against HeLa, PC-3 and MCF-7 cells. Only 1a and 2 showed potency against all three cells. Mechanism based study for activity of the compounds demonstrated that it could block the migration of more aggressive HeLa and PC-3 cells and prevent their colony formation ability as well. The compounds potentiated apoptosis in HeLa and PC-3 cells in a significant manner.
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Affiliation(s)
- Sadhna Sinha
- Amity Institute of Biotechnology, Amity University, Sector 125, Noida 201303, UP, India
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25
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Neff SA, Lee SU, Asami Y, Ahn JS, Oh H, Baltrusaitis J, Gloer JB, Wicklow DT. Aflaquinolones A-G: secondary metabolites from marine and fungicolous isolates of Aspergillus spp. J Nat Prod 2012; 75:464-472. [PMID: 22295903 PMCID: PMC3311757 DOI: 10.1021/np200958r] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Seven new compounds (aflaquinolones A-G; 1-7) containing dihydroquinolin-2-one and terpenoid units have been isolated from two different fungal sources. Two of these metabolites (1 and 2) were obtained from a Hawaiian fungicolous isolate of Aspergillus sp. (section Flavipedes; MYC-2048 = NRRL 58570), while the others were obtained from a marine Aspergillus isolate (SF-5044) collected in Korea. The structures of these compounds were determined mainly by analysis of NMR and MS data. Relative and absolute configurations were assigned on the basis of NOESY data and (1)H NMR J-values, comparison of calculated and experimental ECD spectra, and analysis of a Mosher's ester derivative of 2. Several known compounds, including alantrypinone, aspochalasins I and J, methyl 3,4,5-trimethoxy-2((2-((3-pyridinylcarbonyl)amino)benzoyl)amino)benzoate, and trans-dehydrocurvularin were also encountered in the extract of the Hawaiian isolate.
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Affiliation(s)
- Scott A. Neff
- Department of Chemistry, University of Iowa, Iowa City, IA 52242
| | - Sang Un Lee
- College of Medical and Life Sciences, Silla University, Busan 617-736, Korea
| | - Yukihiro Asami
- Korea Research Institute of Bioscience and Biotechnology (KRIBB), 52 Eoun-dong, Yuseong-gu, Daejeon 305-333, Republic of Korea
| | - Jong Seog Ahn
- Korea Research Institute of Bioscience and Biotechnology (KRIBB), 52 Eoun-dong, Yuseong-gu, Daejeon 305-333, Republic of Korea
| | - Hyuncheol Oh
- College of Medical and Life Sciences, Silla University, Busan 617-736, Korea
| | | | - James B. Gloer
- Department of Chemistry, University of Iowa, Iowa City, IA 52242
| | - Donald T. Wicklow
- Bacterial Foodborne Pathogens and Mycology Research Unit, Agricultural Research Service, National Center for Agricultural Utilization Research, USDA, Peoria, Illinois 61604
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26
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Abstract
2-alkyl-4-quinolones (AQs) such as 2-heptyl-3-hydroxy-4-quinolone (PQS) and 2-heptyl-4-quinolone (HHQ) are quorum sensing signal molecules. Here we describe two methods for AQ detection and quantification that employ thin layer chromatography (TLC) and microtitre plate assays in combination with a lux-based Pseudomonas aeruginosa AQ biosensor strain. For TLC detection, organic solvent extracts of bacterial cells or spent culture supernatants are chromatographed on TLC plates, which are then dried and overlaid with the AQ biosensor. After detection by the bioreporter, AQs appear as both luminescent and green (pyocyanin) spots. For the microtitre assay, either spent bacterial culture supernatants or extracts are added to a growth medium containing the AQ biosensor. Light output by the bioreporter is proportional to the AQ content of the sample. The assays described are simple to perform, do not require sophisticated instrumentation, and are highly amenable to screening large numbers of bacterial samples.
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Affiliation(s)
- Stephen P Diggle
- School of Molecular Medical Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
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27
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Staerk D, Kesting JR, Sairafianpour M, Witt M, Asili J, Emami SA, Jaroszewski JW. Accelerated dereplication of crude extracts using HPLC-PDA-MS-SPE-NMR: quinolinone alkaloids of Haplophyllum acutifolium. Phytochemistry 2009; 70:1055-1061. [PMID: 19540540 DOI: 10.1016/j.phytochem.2009.05.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 04/15/2009] [Accepted: 05/14/2009] [Indexed: 05/27/2023]
Abstract
Direct hyphenation of analytical-scale high-performance liquid chromatography, photo-diode array detection, mass spectrometry, solid-phase extraction and nuclear magnetic resonance spectroscopy (HPLC-PDA-MS-SPE-NMR) has been used for accelerated dereplication of crude extract of Haplophyllum acutifolium (syn. Haplophyllum perforatum). This technique allowed fast on-line identification of six quinolinone alkaloids, named haplacutine A-F, as well as of acutine, haplamine, eudesmine, and 2-nonylquinolin-4(1H)-one. Acutine and haplacutine E, isolated by preparative-scale HPLC, showed moderate antiplasmodial activity with IC(50) values of 2.17+/-0.22 microM and 3.79+/-0.24 microM, respectively (chloroquine-sensitive Plasmodium falciparum 3D7 strain).
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Affiliation(s)
- Dan Staerk
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
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28
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Abstract
The isolation of aurachins A-L (1-11) from Stigmatella aurantiaca strain Sg a15 is described. Their structures and relative configurations were deduced from spectroscopic data, in particular NMR. Three structural types were identified: A-type aurachins (1, 2, 6) are C-3 oxygen-substituted quinolines carrying a farnesyl residue on C-4, C-type aurachins (3, 4, 7-11) are C-4 oxygen-substituted quinolines carrying a farnesyl residue on C-3, and C-type aurachin E (5) has a [1,1a,8,d]imidazoloquinoline structure. Feeding of (13)C-labeled precursors showed that the quinoline ring is constructed from anthranilic acid and acetate, and the farnesyl residue from acetate by both the mevalonate and nonmevalonate pathways. Further, feeding of labeled aurachin C (3) indicated the A-type aurachins are derived by a novel intramolecular 3,4-migration of the farnesyl residue that is induced by a 2,3-epoxidation and terminated by a reduction step. (18)O-Labeling experiments indicated the new oxygen substituents originate from atomospheric oxygen. On the basis of these results a biosynthetic scheme covering all aurachins is proposed. It is further proposed that quinolones with an unorthodox substitution pattern, such as the 2-geranylquinolones from Pseudonocardia sp. and the 3-heptylquinolones from Pseudomonas sp., are formed by related rearrangement mechanisms.
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Affiliation(s)
- Gerhard Höfle
- Helmholtz Centre for Infection Research (previously GBF, Gesellschaft für Biotechnologische Forschung), Inhoffenstrasse 7, 38124 Braunschweig, Germany
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29
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Abstract
2-Alkyl-4-quinolones (AHQs) such as 2-heptyl-3-hydroxy-4-quinolone (PQS) and 2-heptyl-4-quinolone (HHQ) are quorum sensing signal molecules. Here, we describe methods for AHQ detection, tentative identification and quantification, which employ a lux-based Pseudomonas aeruginosa AHQ biosensor strain. The protocol describes both thin-layer chromatography (TLC) and microtiter plate assays, which use bioluminescence or the green color of pyocyanin as detection end points. Organic solvent extracts of bacterial cells or cell-free culture supernatants are chromatographed on TLC plates, which are dried and overlaid with the AHQ biosensor. AHQs appear as both luminescent and green spots. For the microtiter assay, either spent bacterial culture supernatants or extracts are added to a growth medium containing the AHQ biosensor. Light output is proportional to the AHQ content of the sample. The assays described take approximately 2 days to complete, are simple to perform, do not require sophisticated instrumentation and are highly amenable to screening large numbers of bacterial samples. However, apart from PQS and HHQ in P. aeruginosa, definitive AHQ identification will require additional MS and NMR analyses.
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Affiliation(s)
- Matthew P Fletcher
- Institute of Infection, Immunity and Inflammation, Centre for Biomolecular Sciences, University of Nottingham, Nottingham NG7 2RD, UK
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30
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Li J, Xiao G, Chen Y, Gu X. [A review on the determination of quinolones residues in edible animal tissue--I pretreatment methods]. Wei Sheng Yan Jiu 2007; 36:646-651. [PMID: 18095583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In this paper, the methods which described for the determination of quinolone residues in edible animal tissues at home and abroad from 2000.1 to 2006.9 were reviewed. The methods of sample handling were discussed. And a summary of the most relevant information about the analytical procedures was included.
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Affiliation(s)
- Juan Li
- Department of Biology, Chongqing Three Gorges University, Chongqing 404000, China.
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Agier C, Bury M, Aquette J, Hocquemiller R, Waterman PG. New pseudan (2-alkyl-4(1H)-quinolinone) alkaloids from Boronia ternata var. elongata and Boronia alulata (Rutaceae). Nat Prod Res 2007; 21:698-703. [PMID: 17616897 DOI: 10.1080/14786410600898672] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The aerial parts of Boronia ternata var. elongata from western Australia has yielded three new 2-acyl-4(1H)-quinolinone alkaloids, characterised as 2-n-pentyl-4(1H)-quinolinone, 1-methyl-2-n-pentyl-4(1H)-quinolinone and 1-methyl-2-(1 xi-methyl)-propyl-4(1H)-quinolinone, as well as known alkaloids of this class and a furoquinoline alkaloid. Boronia alulata, from northeast Queensland, also yielded 2-n-pentyl-4(1H)-quinolinone together with the known 2-n-propyl-4(1H)-quinolinone. Both species are assigned to Boronia section Valvatae which, alone among the sections of Boronia, appears to be characterised by the presence of alkaloids.
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Affiliation(s)
- Catherine Agier
- Faculte de Pharmacie, Laboratoire de Botanique, F-92296 Chatenay-Malabry Cedex, France
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32
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Cañada-Cañada F, Espinosa-Mansilla A, Muñoz de la Peña A. Separation of fifteen quinolones by high performance liquid chromatography: Application to pharmaceuticals and ofloxacin determination in urine. J Sep Sci 2007; 30:1242-9. [PMID: 17623463 DOI: 10.1002/jssc.200600536] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A simple chromatographic method is described for assaying 15 quinolones and fluoroquinolones (pipemidic acid, marbofloxacin, enoxacin, ofloxacin, norfloxacin, ciprofloxacin, danofloxacin, lomefloxacin, enrofloxacin, sarafloxacin, difloxacin, oxolinic acid, nalidixic acid, flumequine and piromidic acid), in urine and pharmaceutical samples. The determination was achieved by LC using an RP C18 analytical column. A mobile phase composed of mixtures of methanol-ACN-10 mM citrate buffer at pH 3.5 and 10 mM citrate buffer at pH 4.5, delivered under an optimum gradient program, at a flow rate of 1.5 mL/min, allows to accomplish the chromatographic separation in 26 min. For detection, diode-array UV-Vis at 280 nm and fluorescence detection set at excitation wavelength/emission wavelength: 280/450, 280/ 495, 280/405 and 320/360 nm were used. Detection and quantification limits were between 0.3-18 and 0.8-61 ng/mL, respectively. The method was validated in terms of interday (n = 6) and intraday (n = 6) precision and accuracy. The procedure was successfully applied to the analysis of human and veterinary pharmaceuticals. Also, ofloxacin was determined in human urine samples belonging to a patient undergoing treatment with this active principle, among others.
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33
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Han XH, Hong SS, Lee D, Lee JJ, Lee MS, Moon DC, Han K, Oh KW, Lee MK, Ro JS, Hwang BY. Quinolone alkaloids from evodiae fructus and their inhibitory effects on monoamine oxidase. Arch Pharm Res 2007; 30:397-401. [PMID: 17489352 DOI: 10.1007/bf02980210] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
1-Methyl-2-undecyl-4(1H)-quinolone (1) was previously isolated as a selective MAO-B inhibitor from the Evodiae Fructus. Further bioassay-guided purification led to the identification of five known quinolone alkaloids, 1-methyl-2-nonyl-4(1H)-quinolone (2), 1-methyl-2-[(Z)-6-undecenyl]-4(1H)-quinolone (3), evocarpine (4), 1-methyl-2-[(6Z,9Z)-6,9-pentadecadienyl]-4(1H)-quinolone (5), and dihydroevocarpine (6). All the isolates showed more potent inhibitory effects against MAO-B compared to MAO-A. The most MAO-B selective compound 5 among the isolates inhibited MAO-B in a competitive manner, according to kinetic analyses by Lineweaver-Burk reciprocal plots.
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Affiliation(s)
- Xiang Hua Han
- College of Pharmacy, Chungbuk National University, Cheongju, Korea
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34
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Barbato F, di Martino G, Grumetto L, La Rotonda MI. Retention of quinolones on human serum albumin and alpha1-acid glycoprotein HPLC columns: relationships with different scales of lipophilicity. Eur J Pharm Sci 2006; 30:211-9. [PMID: 17169537 DOI: 10.1016/j.ejps.2006.11.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2006] [Revised: 10/19/2006] [Accepted: 11/03/2006] [Indexed: 10/23/2022]
Abstract
The retention of 10 quinolone antibacterial agents on HPLC stationary phases supporting human serum albumin (HSA) or alpha(1)-acid glycoprotein (AGP) was investigated. Among ofloxacine and flumequine, the two chiral compounds in the selected set, only the latter showed a split chromatographic peak and only on HSA but not on AGP, indicating that enantioselective specific sites play only a minor role in the retention. The retention of quinolones, which included four acidic and six zwitterionic congeners, was correlated with various lipophilicity scales: (i) theoretically calculated values, clogP, (ii) values measured at pH 7.4 by the shake-flask method, logD(7.4), and (iii) values extrapolated by retention data measured by ion-pair reversed-phase high performance liquid chromatography (RP-HPLC). We assumed that the latter values, logP(i.p.), were close to the lipophilicity of the neutral forms, logP(N), for both acidic and zwitterionic congeners. No relationship was found between retention on serum proteins and clogP values, whereas a reasonable relationship was found with logD(7.4) values, but only when the two subclasses, acidic and zwitterionic congeners, were considered separately. The relationship between retention data on serum proteins and logP(i.p.) values indicated that the affinity for serum proteins depends on the lipophilicity of the neutral forms only for logP values up to 1.5. Above this value, protein retention does not further increase, becoming almost constant. Based on both the observations above reported and the small values of the slopes of regression equations, we conclude that the interaction of the more lipophilic quinolones, mainly the zwitterions, with serum proteins is not governed uniquely by lipophilicity but also by other mechanisms, probably of electrostatic nature.
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Affiliation(s)
- Francesco Barbato
- Dipartimento di Chimica Farmaceutica e Tossicologica, Università degli Studi di Napoli Federico II, Via D. Montesano, 49 I-80131 Naples, Italy.
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35
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Zhou S, Ouyang J, Baeyens WRG, Zhao H, Yang Y. Chiral separation of four fluoroquinolone compounds using capillary electrophoresis with hydroxypropyl-β-cyclodextrin as chiral selector. J Chromatogr A 2006; 1130:296-301. [PMID: 16774760 DOI: 10.1016/j.chroma.2006.05.055] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2006] [Revised: 05/17/2006] [Accepted: 05/19/2006] [Indexed: 11/30/2022]
Abstract
A capillary zone electrophoresis (CZE) investigation on the enantiomeric separation of lomefloxacin, gatifloxacin, pazufloxacin and ofloxacin was undertaken. Resolution of the enantiomers was achieved using hydroxypropyl-beta-cyclodextrin (HP-beta-CD) as the chiral selector. Parameters influencing separation include cyclodextrin concentration, separational potential, pH and organic additive are discussed. A buffer consisting of 70 mM phosphate and 40 mM HP-beta-CD at pH 3.96 was found to be highly efficient for the separation of lomefloxacin, at pH 3.90 for gatifloxacin, at pH 5.04 for pazufloxacin and at pH 2.16 for ofloxacin. To the best of our knowledge, this is the first report on the enantiomeric resolution of lomefloxacin and gatifloxacin applying CE.
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Affiliation(s)
- Shanshan Zhou
- Department of Chemistry, Beijing Normal University, Beijing 100875, China
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36
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Uchida R, Imasato R, Yamaguchi Y, Masuma R, Shiomi K, Tomoda H, Omura S. Yaequinolones, New Insecticidal Antibiotics Produced by Penicillium sp. FKI-2140. J Antibiot (Tokyo) 2006; 59:646-51. [PMID: 17191680 DOI: 10.1038/ja.2006.86] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
New nine insecticidal antibiotics designated yaequinolones were isolated from the culture broth of the fungal strain Penicillium sp. FKI-2140 by solvent extraction, centrifugal partition chromatography and HPLC. Yaequinolones showed growth inhibitory activity against brine shrimp (Artemia salina). Among them, yaequinolone F has the most potent activity with MIC value of 0.19 microg/ml.
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Affiliation(s)
- Ryuji Uchida
- School of Pharmacy, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
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37
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Xu ML, Li G, Moon DC, Lee CS, Woo MH, Lee ES, Jahng Y, Chang HW, Lee SH, Son JK. Cytotoxicity and DNA topoisomerase inhibitory activity of constituents isolated from the fruits of Evodia officinalis. Arch Pharm Res 2006; 29:541-7. [PMID: 16903072 DOI: 10.1007/bf02969262] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Four alkaloids (1-4), three quinolone alkaloids (5-7), and three flavanoid glucosides (8-10) were isolated from the fruits of Evodia officinalis Dode, and their structures were determined from chemical and spectral data. Compounds, 3, 8, 9 and 10 were isolated from this plant for the first time. Of these compounds, 1-3 and 5-7 exhibited moderate cytotoxicities against cultured human colon carcinoma (HT-29), human breast carcinoma (MCF-7), and human hepatoblastoma (HepG-2). Compound 8 showed strong inhibitory effects on DNA topoisomerases I and II (70 and 96% inhibition at a concentration of 20 microM, respectively).
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Affiliation(s)
- Ming-Lu Xu
- College of Pharmacy, Yeungnam University, Gyongsan 712-749, Korea
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38
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Jain SC, Pandey MK, Upadhyay RK, Kumar R, Hundal G, Hundal MS. Alkaloids from Toddalia aculeata. Phytochemistry 2006; 67:1005-10. [PMID: 16647728 DOI: 10.1016/j.phytochem.2006.03.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2005] [Revised: 03/07/2006] [Accepted: 03/14/2006] [Indexed: 05/08/2023]
Abstract
Two alkaloids N-methyl-4-hydroxy-7-methoxy-3-(2,3-epoxy-3-methylbutyl)-1H-quinolin-2-one (1) and 3-(2,3-dihydroxy-3-methylbutyl)-4,7-dimethoxy-1-methyl-1H-quinolin-2-one (2a) have been isolated from CH(2)Cl(2):methanol (1:1) and methanol extracts of leaves and stems of Toddalia aculeata. Their structures along with that of 15 other compounds, of which three are isolated for the first time from genus Toddalia, were established by their detailed spectral studies including 2D NMR viz. (1)H-(1)H COSY, (1)H-(13)C COSY, and HMBC.
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Affiliation(s)
- Subhash C Jain
- Department of Chemistry, University of Delhi, Delhi 110 007, India.
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39
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Samanidou VF, Christodoulou EA, Papadoyannis IN. Validation of a novel HPLC sorbent material for the determination of ten quinolones in human and veterinary pharmaceutical formulations. J Sep Sci 2005; 28:2444-53. [PMID: 16405173 DOI: 10.1002/jssc.200500262] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A novel sorbent material of ultrapure silica gel provided with novel State of the Art Bonding- and Endcapping Technology commercially available under the name PerfectSil Target (250 x 4 mm, ODS-3, 5 microm, by MZ-Analysentechnik, Germany) was used and validated for the sensitive HPLC determination of ten quinolone antibiotics: enoxacin, ofloxacin, norfloxacin, ciprofloxacin, danofloxacin (DAN), enrofloxacin (ENR), sarafloxacin, oxolinic acid (OXO), nalidixic acid (NAL), and flumequine. The analytical column validation was performed in terms of separation efficiency, precision, and peak asymmetry. The separation was achieved at ambient temperature using a mobile phase of TFA (0.1%)-CH3OH-CH3CN delivered under the optimum gradient program, at a flow rate of 1.2 mU/min. Photodiode array detection was used and eluant was monitored at 275 nm. For the quantitative determination caffeine (7.5 ng/microL) was used as internal standard. The achieved LODs were 0.03 ng/microL per 50 microL injected volume for OXO, 0.1 ng/microL for DAN, ENR, and NAL, and 0.2 ng/microL for the remaining six studied quinolones. The method was validated in terms of interday (n = 6) and intraday (n = 5) precision and accuracy. The proposed method was successfully applied to the analysis of pharmaceutical formulations destined either for human or for veterinary use.
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Affiliation(s)
- Victoria F Samanidou
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
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40
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Abstract
[chemical reaction: see text]. Two novel insecticidal antibiotics with a p-methoxyphenylquinolinone skeleton fused with a pyran ring, yaequinolones J1 (1) and J2 (2), have been isolated from Penicillium sp. FKI-2140, and structures were elucidated by spectroscopic studies including various NMR experiments. The relative stereochemistries were assigned by NOE experiments. Yaequinolones J1 and J2 showed toxicity against Artemia salina (brine shrimp) with the MIC value of 6.25 microg/mL.
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Affiliation(s)
- Ryuji Uchida
- The Kitasato Institute and Kitasato Institute for Life Sciences, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
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41
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Tominaga K, Higuchi K, Hamasaki N, Tanigawa T, Sasaki E, Watanabe T, Fujiwara Y, Oshitani N, Arakawa T, Ishii E, Tezuka Y, Nagaoka T, Kadota S. [Antibacterial activity of a Chinese herbal medicine, Gosyuyu (Wu-Chu-Yu), against Helicobacter pylori]. Nihon Rinsho 2005; 63 Suppl 11:592-9. [PMID: 16363608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Affiliation(s)
- Kazunari Tominaga
- Department of Gastroenterology, Osaka City University Graduate School of Medicine
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42
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Abe M, Imai T, Ishii N, Usui M, Okuda T, Oki T. Quinolactacide, a new quinolone insecticide from Penicillium citrinum Thom F 1539. Biosci Biotechnol Biochem 2005; 69:1202-5. [PMID: 15973055 DOI: 10.1271/bbb.69.1202] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
By a screening program searching for new pesticides from fungal sources, an insecticidal compound was isolated from Penicillium citrinum F 1539. The compound, named quinolactacide, was novel and showed 88% mortality against green peach aphids (Myzus persicae) at 250 ppm. Its structure was determined by spectroscopic techniques.
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Affiliation(s)
- Masaki Abe
- Naruto Research Center, Otsuka Chemical Co., Ltd., Naruto, Tokushima, Japan.
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Cantrell CL, Schrader KK, Mamonov LK, Sitpaeva GT, Kustova TS, Dunbar C, Wedge DE. Isolation and identification of antifungal and antialgal alkaloids from Haplophyllum sieversii. J Agric Food Chem 2005; 53:7741-8. [PMID: 16190626 DOI: 10.1021/jf051478v] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Bioassay-guided fractionation of the hexane/ethyl acetate/water (H/EtOAc/H2O) crude extract of the aerial parts of Haplophyllum sieversii was performed because of preliminary screening data that indicated the presence of growth inhibitory components against Colletotrichum fragariae, Colletotrichum gloeosporioides, and Colletotrichum acutatum. Fractionation was directed using bioautographical methods resulting in the isolation of the bioactive alkaloids flindersine, anhydroevoxine, haplamine, and a lignan eudesmin. These four compounds were evaluated for activity against C. fragariae, C. gloeosporioides, C. acutatum, Botrytis cinerea, Fusarium oxysporum, and Phomopsis obscurans in a dose-response growth-inhibitory bioassay at 50.0, 100.0, and 150.0 microM. Of the four compounds tested, flindersine demonstrated the highest level of antifungal activity. Additionally, flindersine, eudesmin, and haplamine were screened against the freshwater phytoplanktons Oscillatoria perornata, Oscillatoria agardhii, Selenastrum capricornutum, and Pseudanabaena sp. (strain LW397). Haplamine demonstrated selective inhibition against the odor-producing cyanobacterium O. perornata compared to the activity against the green alga S. capricornutum, with lowest observed effect concentration values of 1.0 and 10.0 microM, respectively.
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Affiliation(s)
- C L Cantrell
- USDA-ARS, Natural Products Utilization Research Unit, University, Mississippi 38677, USA.
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He J, Lion U, Sattler I, Gollmick FA, Grabley S, Cai J, Meiners M, Schünke H, Schaumann K, Dechert U, Krohn M. Diastereomeric quinolinone alkaloids from the marine-derived fungus Penicillium janczewskii. J Nat Prod 2005; 68:1397-9. [PMID: 16180822 DOI: 10.1021/np058018g] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
From Penicillium janczewskii, obtained from a marine sample, two new diastereomeric quinolinones, 3S,4R-dihydroxy-4-(4'-methoxyphenyl)-3,4-dihydro-2(1H)-quinolinone (1) and 3R,4R-dihydroxy-4-(4'-methoxyphenyl)-3,4-dihydro-2(1H)-quinolinone (2), were identified, along with two known alkaloids, peniprequinolone (3) and 3-methoxy-4-hydroxy-4-(4'-methoxyphenyl)-3,4-dihydro-2(1H)-quinolinone (4). Cytotoxicity testing on eight tumor cell lines revealed a moderate specificity of 2 on SKOV-3 cells.
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Affiliation(s)
- Jian He
- Leibniz-Institute for Natural Products Research and Infection Biology, Hans-Knöll-Institute, Beutenbergstrasse 11a, D-07745 Jena, Germany
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Adams M, Wube AA, Bucar F, Bauer R, Kunert O, Haslinger E. Quinolone alkaloids from : a potent new group of antimycobacterial compounds. Int J Antimicrob Agents 2005; 26:262-4. [PMID: 16051468 DOI: 10.1016/j.ijantimicag.2005.06.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ferdig M, Kaleta A, Buchberger W. Improved liquid chromatographic determination of nine currently used (fluoro)quinolones with fluorescence and mass spectrometric detection for environmental samples. J Sep Sci 2005; 28:1448-56. [PMID: 16158986 DOI: 10.1002/jssc.200400065] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An HPLC method using C18-modified silica as stationary phase has been developed for environmental trace analysis of nine (fluoro)quinolones. Detection is done by fluorescence measurement or MS using the modes of SIM and selected reaction monitoring (SRM). Best separation is achieved with a gradient consisting of 50 mM formic acid and methanol, which is fully compatible with MS coupling. LOQs (S/N of 10) for fluorescence detection are between 10 and 60 microg/L, depending on the analyte. MS detection (SIM and SRM) yields LOQs that are better by a factor of at least an order of magnitude. Sample preconcentration and sample clean-up is accomplished by SPE (preconcentration factor of 1000), leading to LOQs in the low ng/L range. Recoveries of the preconcentration procedure are better than 80% for all analytes. The suitability for real samples has been demonstrated by analyzing surface waters, municipal waste waters, sewage treatment plant effluents, sewage sludge, and sediment taken from rivers and fish ponds. The method should also be useful for determination of residues of (fluoro)quinolones in food or other matrices. The degradation of the (fluoro)quinolones has been examined over 5 days in order to get information about the decomposition rate and the degradation products eventually occurring in the environment.
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Affiliation(s)
- Matthias Ferdig
- Institute of Analytical Chemistry, Johannes-Kepler-University Linz, Linz, Austria.
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Garcia MA, Solans C, Calvo A, Hernandez E, Rey R, Bregante MA, Puig M. Determination of enro?oxacin and its primary metabolite, cipro?oxacin, in pig tissues. Application to residue studies. Biomed Chromatogr 2005; 19:27-31. [PMID: 15470686 DOI: 10.1002/bmc.411] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A simple and sensitive HPLC method has been developed for the simultaneous determination of enrofloxacin (ENR) and ciprofloxacin (CIP) in pig tissue using difloxacin (DIF) as internal standard. Tissue sample preparations were carried out by adding phosphate buffer (pH 7.4, 0.1 m), followed by extraction with trichloromethane. Fluoroquinolones were separated on a reversed-phase column and eluted with aqueous buffer solution-acetonitrile (80:20, v/v). The concentrations of CIP, ENR and DIF eluted from the column, with retention times of 2.20, 2.73 and 4.38 min, respectively, were monitored by fluorescence detection at lambda(ex) 276 and lambda(em) 442 nm. The detection and quantitation limit were 8 and 25 ng/g, respectively, for both compounds. Standard curves were linearly related to concentration in the range 25-400 ng/g. The consequences of the introduction of minor reasonable variations (ruggedness studies) have also been analysed. Finally, the measurement of the tissue levels of ENR and CIP in the pig tissues after oral administration confirmed the utility of the proposed method.
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Affiliation(s)
- M A Garcia
- Department of Analytical Chemistry, Veterinary Faculty, University of Zaragoza, Miguel Servet 177, 50013 Zaragoza, Spain
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Ito C, Itoigawa M, Furukawa A, Hirano T, Murata T, Kaneda N, Hisada Y, Okuda K, Furukawa H. Quinolone alkaloids with nitric oxide production inhibitory activity from Orixa japonica. J Nat Prod 2004; 67:1800-3. [PMID: 15568765 DOI: 10.1021/np0401462] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Four new quinolone alkaloids, orixalone A (1), B (2), C (3), and D (4), together with 12 known compounds were isolated from the stems of Orixa japonica. Orixalone A (1) inhibited nitric oxide production in murine macrophage-like RAW 264.7 cells stimulated with interferon-gamma and lipopolysaccharide.
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Affiliation(s)
- Chihiro Ito
- Department of Medicinal Chemistry, Faculty of Pharmacy, Meijo University, Tempaku, Nagoya 468-8503, Japan
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Sunderland J, Lovering AM, Tobin CM, MacGowan AP, Roe JM, Delsol AA. A reverse-phase HPLC assay for the simultaneous determination of enrofloxacin and ciprofloxacin in pig faeces. Int J Antimicrob Agents 2004; 23:390-3. [PMID: 15081089 DOI: 10.1016/j.ijantimicag.2003.07.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2003] [Accepted: 07/18/2003] [Indexed: 11/26/2022]
Abstract
A reverse-phase HPLC assay is described for the simultaneous assay of enrofloxacin (ENR) and ciprofloxacin (CPX) in pig faeces. Extraction used dichloromethane, 2-propanol and 0.3M ortho-phosphoric acid (1:5:4 v/v/v). Separation was achieved using a Spherisorb S5 C8 column, heated to 50 degrees C and a mobile phase of 0.16% ortho-phosphoric acid (adjusted to pH 3.0 with tetrabutylammonium hydroxide solution) with 20 ml acetonitrile per litre solution. The method used fluorescence detection (Ex 310 nm; Em 445 nm), a flow rate of 1 ml/min and a 20 microl injection volume. Retention times were approximately 6 min for ciprofloxacin and 10 min for enrofloxacin. The linearity range for both compounds was 0-20 mg/kg, lowest limit of quantification 0.3 mg/kg and recoveries were >92%.
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Affiliation(s)
- Julie Sunderland
- Microbiology Department, Bristol Centre for Antimicrobial Research and Evaluation, Southmead Hostital, North Bristol NHS Trust, Bristol, BS10 5NB, UK.
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Subbaraju GV, Kavitha J, Rajasekhar D, Jimenez JI. Jusbetonin, the first indolo[3,2-b]quinoline alkaloid glycoside, from Justicia betonica. J Nat Prod 2004; 67:461-462. [PMID: 15043432 DOI: 10.1021/np030392y] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A new indolo[3,2-b]quinoline alkaloid glycoside, jusbetonin (1), and three known alkaloids, namely, 10H-quindoline (2), 6H-quinindoline (3), and 5H,6H-quinindolin-11-one (4), have been isolated from the leaves of Justicia betonica. The structure of 1 was established on the basis of 1D and 2D NMR ((1)H-(1)H COSY, HMQC, and HMBC) and HRFABMS data. Compound 1 is the first example of a glycosylated indolo[3,2-b]quinoline alkaloid, while compound 4 was isolated for the first time from a natural source.
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