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Long Q, Zhou W, Zhou H, Tang Y, Chen W, Liu Q, Bian X. Polyamine-containing natural products: structure, bioactivity, and biosynthesis. Nat Prod Rep 2024; 41:525-564. [PMID: 37873660 DOI: 10.1039/d2np00087c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Covering: 2005 to August, 2023Polyamine-containing natural products (NPs) have been isolated from a wide range of terrestrial and marine organisms and most of them exhibit remarkable and diverse activities, including antimicrobial, antiprotozoal, antiangiogenic, antitumor, antiviral, iron-chelating, anti-depressive, anti-inflammatory, insecticidal, antiobesity, and antioxidant properties. Their extraordinary activities and potential applications in human health and agriculture attract increasing numbers of studies on polyamine-containing NPs. In this review, we summarized the source, structure, classification, bioactivities and biosynthesis of polyamine-containing NPs, focusing on the biosynthetic mechanism of polyamine itself and representative polyamine alkaloids, polyamine-containing siderophores with catechol/hydroxamate/hydroxycarboxylate groups, nonribosomal peptide-(polyketide)-polyamine (NRP-(PK)-PA), and NRP-PK-long chain poly-fatty amine (lcPFAN) hybrid molecules.
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Affiliation(s)
- Qingshan Long
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China.
| | - Wen Zhou
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural, Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Haibo Zhou
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China.
| | - Ying Tang
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China.
| | - Wu Chen
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China.
| | - Qingshu Liu
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China.
| | - Xiaoying Bian
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China.
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Wang T, Li Q, Zhou Z, Liu J, Tao Y, Zhang Y, Zeng Y, Zhang S, Su J. Review of traditional uses, phytochemistry and pharmacology of Tibetan Medicine tangchong. JOURNAL OF ETHNOPHARMACOLOGY 2024; 319:117129. [PMID: 37689329 DOI: 10.1016/j.jep.2023.117129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 08/18/2023] [Accepted: 09/03/2023] [Indexed: 09/11/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Tangchong (ཐང་ཕྲོམ།), a term in the Tibetan language, encompasses a diverse group of plants belonging to different genera of the Solanaceae family. These plants have been utilized in traditional Tibetan medicine for centuries and are currently still employed to treat a variety of ailments, including acute and severe abdominal pain, intestinal obstruction, epilepsy, ascariasis, lung abscess, and other diseases. The therapeutic properties of tangchong are attributed to the presence of tropane alkaloids (TAs), although recent research has also revealed their toxicity. AIM OF THIS REVIEW The purpose of this review is to provide a comprehensive analysis of the traditional uses of tangchong, as well as the phytochemical and pharmacological studies conducted on this plant. The review aims to offer a critical update on the current state of knowledge of tangchong and to identify new opportunities for exploring its therapeutic potential. MATERIALS AND METHODS To gather information on tangchong, we conducted a thorough search of several scientific databases, including Google Scholar, Web of Science, Scifinder, Baidu Scholar, PubMed, and CNKI. RESULTS This review summarizes the traditional usage of 11 plants, 168 chemical components, including alkaloids, flavonoids, steroids, amides, coumarins, etc., describes the pharmacological activities of these medicinal plants and their mechanisms of action, provides an elaboration of toxicology, and provides new plant-derived drugs and herbal preparations from tangchong. CONCLUSIONS Clarity regarding the source of the drug is crucial to ensure the safety and efficacy of clinical applications of Tibetan medicine. In this paper, we provide a comprehensive review of tangchong, including its traditional medicinal uses, chemical composition, pharmacology, toxicology, and quality control measures. Our analysis highlights the significant value of tangchong as an ethnomedicinal resource, with pharmacological activities primarily linked to its alkaloid content. Furthermore, this review serves as a valuable reference for future research on alkaloid-containing ethnomedicines.
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Affiliation(s)
- Tianru Wang
- College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Qiuyue Li
- Pharmacy Intravenous Admixture Service of the Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou, 646000, China
| | - Ziyu Zhou
- College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Jia Liu
- Research Institute of Integrated TCM and Western Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Yiwen Tao
- College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Yi Zhang
- Research Institute of Integrated TCM and Western Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Yong Zeng
- College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China.
| | - Sanyin Zhang
- Research Institute of Integrated TCM and Western Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China.
| | - Jinsong Su
- Research Institute of Integrated TCM and Western Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China.
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Zhu H, Zhao HY, Peng C, Shu HZ, Liu ZH, Zhou QM, Xiong L. New indolizidine- and pyrrolidine-type alkaloids with anti-angiogenic activities from Anisodus tanguticus. Biomed Pharmacother 2023; 167:115481. [PMID: 37703664 DOI: 10.1016/j.biopha.2023.115481] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 09/06/2023] [Accepted: 09/07/2023] [Indexed: 09/15/2023] Open
Abstract
Eleven alkaloids, including five previously undescribed indolizidine alkaloids (1, 2a, 2b, 3a, and 3b) and four new pyrrolidine alkaloids (5-8), were isolated from the roots of Anisodus tanguticus. Of these, two new pairs of enantiomeric alkaloids (2a/2b and 3a/3b) are the first examples of alkaloids containing both indolizidine and pyrrolidine structural fragments. The one-carbon bridge connections with two pyrrolidine rings (6) or with a pyrrolidine ring and a pyridine ring (8) are the first reported from nature. Extensive spectroscopic techniques were used to elucidate their structures, and NMR and ECD calculations were used to determine the absolute configurations. The viability of human umbilical vein endothelial cells (HUVECs) was inhibited by compounds 2a, 2b, 3a, 4b, and 5, and compound 2b exhibited a potential anti-angiogenic effect by inhibiting the proliferation, migration, and tube formation of HUVECs. A chorioallantoic membrane assay also demonstrated the anti-angiogenic activity of 2b. In addition, compounds 2a, 2b, 3a, and 4b exhibited moderate cytotoxicity against A2780 cells.
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Affiliation(s)
- Huan Zhu
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China; Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China
| | - Hao-Yu Zhao
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China; Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China
| | - Cheng Peng
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China.
| | - Hong-Zhen Shu
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China; Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China
| | - Zhao-Hua Liu
- Chengdu No.1 Pharmaceutical Co. Ltd., Chengdu 610031, China
| | - Qin-Mei Zhou
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China; Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China; Innovative Institute of Chinese Medicine and Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China.
| | - Liang Xiong
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China; Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China.
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Macoy DMJ, Uddin S, Ahn G, Peseth S, Ryu GR, Cha JY, Lee JY, Bae D, Paek SM, Chung HJ, Mackey D, Lee SY, Kim WY, Kim MG. Effect of Hydroxycinnamic Acid Amides, Coumaroyl Tyramine and Coumaroyl Tryptamine on Biotic Stress Response in Arabidopsis. JOURNAL OF PLANT BIOLOGY 2022; 65:145-155. [DOI: 10.1007/s12374-021-09341-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/26/2021] [Accepted: 11/03/2021] [Indexed: 08/28/2023]
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Zhao H, Zhou Q, Zhu H, Zhou F, Meng C, Shu H, Liu Z, Peng C, Xiong L. Anisotanols A—D, Four Norsesquiterpenoids with an Unprecedented Sesquiterpenoid Skeleton from
Anisodus tanguticus
‡. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202100524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Hao‐Yu Zhao
- School of Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- State Key Laboratory of Southwestern Chinese Medicine Resources Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
| | - Qin‐Mei Zhou
- School of Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- State Key Laboratory of Southwestern Chinese Medicine Resources Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- Innovative Institute of Chinese Medicine and Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
| | - Huan Zhu
- School of Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- State Key Laboratory of Southwestern Chinese Medicine Resources Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
| | - Fei Zhou
- School of Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- State Key Laboratory of Southwestern Chinese Medicine Resources Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
| | - Chun‐Wang Meng
- School of Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- State Key Laboratory of Southwestern Chinese Medicine Resources Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
| | - Hong‐Zhen Shu
- School of Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- State Key Laboratory of Southwestern Chinese Medicine Resources Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
| | - Zhao‐Hua Liu
- Chengdu No.1 Pharmaceutical Co., Ltd. Chengdu Sichuan 610031 China
| | - Cheng Peng
- School of Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- State Key Laboratory of Southwestern Chinese Medicine Resources Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
| | - Liang Xiong
- School of Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- State Key Laboratory of Southwestern Chinese Medicine Resources Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
- Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
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Chemical constituents from Lycium barbarum (Solanaceae) and their chemophenetic significance. BIOCHEM SYST ECOL 2021. [DOI: 10.1016/j.bse.2021.104292] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Wang JX, Zhao YP, Du NN, Han Y, Li H, Wang R, Xu Y, Liu YF, Liang XM. Scocycamides, a Pair of Macrocyclic Dicaffeoylspermidines with Butyrylcholinesterase Inhibition and Antioxidation Activity from the Roots of Scopolia tangutica. Org Lett 2020; 22:8240-8244. [DOI: 10.1021/acs.orglett.0c02838] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Ji-Xia Wang
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Jiangxi Chinese Medicine Science Center of DICP, CAS, Nanchang 330000, China
| | - Yao-Peng Zhao
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Na-Na Du
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yang Han
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hao Li
- Jiangxi Chinese Medicine Science Center of DICP, CAS, Nanchang 330000, China
| | - Rong Wang
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yang Xu
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yan-Fang Liu
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Jiangxi Chinese Medicine Science Center of DICP, CAS, Nanchang 330000, China
| | - Xin-Miao Liang
- Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Jiangxi Chinese Medicine Science Center of DICP, CAS, Nanchang 330000, China
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Du N, Zhou W, Jin H, Liu Y, Zhou H, Liang X. Characterization of tropane and cinnamamide alkaloids from
Scopolia tangutica
by high‐performance liquid chromatography with quadrupole time‐of‐flight tandem mass spectrometry. J Sep Sci 2019; 42:1163-1173. [DOI: 10.1002/jssc.201801201] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 01/05/2019] [Accepted: 01/05/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Nana Du
- Key Lab of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of Sciences Dalian P. R. China
- University of Chinese Academy of Sciences Beijing P. R. China
| | - Weijia Zhou
- Key Lab of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of Sciences Dalian P. R. China
- University of Chinese Academy of Sciences Beijing P. R. China
| | - Hongli Jin
- Key Lab of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of Sciences Dalian P. R. China
| | - Yanfang Liu
- Key Lab of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of Sciences Dalian P. R. China
| | - Han Zhou
- Key Lab of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of Sciences Dalian P. R. China
| | - Xinmiao Liang
- Key Lab of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of Sciences Dalian P. R. China
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Natural Antispasmodics: Source, Stereochemical Configuration, and Biological Activity. BIOMED RESEARCH INTERNATIONAL 2018; 2018:3819714. [PMID: 30402474 PMCID: PMC6196993 DOI: 10.1155/2018/3819714] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 08/28/2018] [Indexed: 12/27/2022]
Abstract
Natural products with antispasmodic activity have been used in traditional medicine to alleviate different illnesses since the remote past. We searched the literature and compiled the antispasmodic activity of 248 natural compounds isolated from terrestrial plants. In this review, we summarized all the natural products reported with antispasmodic activity until the end of 2017. We also provided chemical information about their extraction as well as the model used to test their activities. Results showed that members of the Lamiaceae and Asteraceae families had the highest number of isolated compounds with antispasmodic activity. Moreover, monoterpenoids, flavonoids, triterpenes, and alkaloids were the chemical groups with the highest number of antispasmodic compounds. Lastly, a structural comparison of natural versus synthetic compounds was discussed.
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Torras-Claveria L, Bastida J, Viladomat F, Tiburcio AF. Analysis of Polyamines Conjugated with Hydroxycinnamoyl Acids by High-Performance Liquid Chromatography Coupled to Electrospray Ionization Tandem Mass Spectrometry. Methods Mol Biol 2018; 1694:95-104. [PMID: 29080159 DOI: 10.1007/978-1-4939-7398-9_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Polyamines conjugated with hydroxycinnamic acids are phenolic compounds, which are widespread in the plant kingdom playing important roles in development and defence responses. This chapter describes the methodology employed to analyze these phenolamides in plant material by liquid chromatography coupled to electrospray ionization tandem mass spectrometry (LC-MS-MS). These compounds are not always in sufficient concentration in plant tissues for analysis by more conventional methods such as UV detection of HPLC. Owing to their particular molecular structure, they cannot be analyzed as free polyamines. Thus, described herein is an extraction method for hydroxycinnamic acid amides in plant tissues such as leaves, and their analysis by LC-MS-MS, including identification and quantification protocols.
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Affiliation(s)
- Laura Torras-Claveria
- Department of Biology, Healthcare and Environment, Faculty of Pharmacy, University of Barcelona, Avda. Joan XXIII 27-31, 08028, Barcelona, Spain
| | - Jaume Bastida
- Department of Biology, Healthcare and Environment, Faculty of Pharmacy and Food Sciences, Section of Plant Physiology, University of Barcelona, Avda. Joan XXIII 27-31, 08028, Barcelona, Spain
| | - Francesc Viladomat
- Department of Biology, Healthcare and Environment, Faculty of Pharmacy and Food Sciences, Section of Plant Physiology, University of Barcelona, Avda. Joan XXIII 27-31, 08028, Barcelona, Spain
| | - Antonio F Tiburcio
- Department of Biology, Healthcare and Environment, Faculty of Pharmacy and Food Sciences, Section of Plant Physiology, University of Barcelona, Avda. Joan XXIII 27-31, 08028, Barcelona, Spain.
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Discovery of new muscarinic acetylcholine receptor antagonists from Scopolia tangutica. Sci Rep 2017; 7:46067. [PMID: 28387362 PMCID: PMC5384254 DOI: 10.1038/srep46067] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 03/08/2017] [Indexed: 12/11/2022] Open
Abstract
Scopolia tangutica (S. tangutica) is a traditional Chinese medicinal plant used for antispasmodics, anesthesia, analgesia and sedation. Its pharmacological activities are mostly associated with the antagonistic activity at muscarinic acetylcholine receptors (mAchRs) of several known alkaloids such as atropine and scopolamine. With our recent identification of four hydroxycinnamic acid amides from S. tangutica, we hypothesized that this plant may contain previously unidentified alkaloids that may also contribute to its in vivo effect. Herein, we used a bioassay-guided multi-dimension separation strategy to discover novel mAchR antagonists from S. tangutica. The core of this approach is to use label-free cell phenotypic assay to first identify active fractions, and then to guide purification of active ligands. Besides four tropanes and six cinnamic acid amides that have been previously isolated from S. tangutica, we recently identified two new tropanes, one new cinnamic acid amide, and nine other compounds. Six tropane compounds purified from S. tangutica for the first time were confirmed to be competitive antagonists of muscarinic receptor 3 (M3), including the two new ones 8 and 12 with IC50 values of 1.97 μM and 4.47 μM, respectively. Furthermore, the cinnamic acid amide 17 displayed 15-fold selectivity for M1 over M3 receptors. These findings will be useful in designing lead compounds for mAchRs and elucidating mechanisms of action of S. tangutica.
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