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Munikishore R, Liu R, Zhang S, Zhao QS, Nian Y, Zuo Z. Structurally modified Cyclovirobuxine-D Buxus alkaloids as effective analgesic agents through Ca v3.2 T-Type calcium channel inhibition. Bioorg Chem 2023; 135:106493. [PMID: 36996509 DOI: 10.1016/j.bioorg.2023.106493] [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] [Received: 01/14/2023] [Revised: 03/02/2023] [Accepted: 03/21/2023] [Indexed: 03/31/2023]
Abstract
Cyclovirobuxine-D (CVB-D) is a Buxus alkaloid and a major active constituent in the Chinese medicinal herb Buxus microphylls. Traditionally, the natural alkaloid cyclovirobuxine-D has a long history of use as a traditional Chinese medicine for cardiovascular diseases as well as to treat a wide variety of medical conditions. As we found that CVB-D inhibited T-type calcium channels, we designed and synthesized a variety of fragments and analogues and evaluated them for the first time as new Cav3.2 inhibitors. Compounds 2-7 exhibited potency against Cav 3.2 channels, and two of them were more active than their parent molecules. As a result of the in vivo experiments, both compounds 3 and 4 showed significantly reduced writhes in the acetic acid-induced writhing test. Studies of molecular modeling have identified possible mechanism(s) of Cav3.2 binding. Moreover, the relationship between structure and activity was studied in a preliminary manner. Our results indicated that compounds 3 and 4 could play an important role in the discovery and development of novel analgesics.
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Affiliation(s)
- Rachakunta Munikishore
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan Province, People's Republic of China; Sadashiva Life Sciences, Research and Development Division, Navodaya Industrial Park, IDA Cherlapally, Hyderabad 500051, India
| | - Rui Liu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan Province, People's Republic of China
| | - Shuqun Zhang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan Province, People's Republic of China
| | - Qin-Shi Zhao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan Province, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
| | - Yin Nian
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan Province, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
| | - Zhili Zuo
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan Province, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
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Notoginsenoids, a new class of hexa-nortriterpenoids from biotransformation of Panax notoginseng saponins. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Elsbaey M, Mwakalukwa R, Shimizu K, Miyamoto T. Pentacylic triterpenes from Lavandula coronopifolia: structure related inhibitory activity on α-glucosidase. Nat Prod Res 2019; 35:1436-1444. [PMID: 31434504 DOI: 10.1080/14786419.2019.1655017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Ten pentacyclic triterpenes (1-10) were isolated from Lavandula coronopifolia. We evaluated their α-glucosidase inhibitory activity, and found that the aglycones, 1, 2, 3, 4, 7 and 10 showed superior IC50 values to the positive control. In order to explain the structural requirements for α-glucosidase inhibitory activity, eleven derivatives were prepared, including one new compound, 2-formyl-(A)1-19α-hydroxy-1-norursane-2, 12-dien-28-oic acid 10c. The results demonstrated that a free hydroxyl at ring-A and a free carboxylic group at position 28 are key structural features for the α-glucosidase inhibitory activity, also that an ursane skeleton is optimum for the activity. Additionally, enzyme kinetic analysis of pomolic acid 2, the most potent compound, revealed that it inhibited α-glucosidase in a mixed-type manner. The molecular docking simulation validated this type of inhibition and highlighted the role of the C-3 hydroxyl and C-28 carboxylic groups in interaction with the enzyme in silico.
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Affiliation(s)
- Marwa Elsbaey
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, 35516, Egypt.,Department of Natural Products Chemistry, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Rogers Mwakalukwa
- Department of Agro-environmental Sciences, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.,Department of Pharmacognosy, School of Pharmacy, Muhimbili University of Health and Allied Sciences, Dar es Salaam, P.O. Box 65013, Tanzania
| | - Kuniyoshi Shimizu
- Department of Agro-environmental Sciences, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Tomofumi Miyamoto
- Department of Natural Products Chemistry, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
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Ekiz G, Duman S, Bedir E. Biotransformation of cyclocanthogenol by the endophytic fungus Alternaria eureka 1E1BL1. PHYTOCHEMISTRY 2018; 151:91-98. [PMID: 29677643 DOI: 10.1016/j.phytochem.2018.04.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 03/31/2018] [Accepted: 04/09/2018] [Indexed: 06/08/2023]
Abstract
The microbial transformation of cyclocanthogenol (CCG), Astragalus sp. originated sapogenin, by the endophytic fungus Alternaria eureka 1E1BL1 isolated from Astragalus angustifolius was investigated. Hydroxylation, oxidation, epoxidation, O-methylation, ring-expansion and methyl migration reactions were observed on the triterpenoid skeleton. As a result, eight metabolites were isolated and the structures of the previously undescribed compounds were established by 1-D, 2-D NMR and HR-MS analyses.
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Affiliation(s)
- Güner Ekiz
- Department of Pharmacognosy, Faculty of Pharmacy, Near East University, Nicosia, Mersin 10, Turkey
| | - Seda Duman
- Department of Bioengineering, Faculty of Engineering, Izmir Institute of Technology, 35430 Urla-Izmir, Turkey
| | - Erdal Bedir
- Department of Bioengineering, Faculty of Engineering, Izmir Institute of Technology, 35430 Urla-Izmir, Turkey.
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Debeleç-Bütüner B, Öztürk MB, Tağ Ö, Akgün İH, Yetik-Anacak G, Bedir E, Korkmaz KS. Cycloartane-type sapogenol derivatives inhibit NFκB activation as chemopreventive strategy for inflammation-induced prostate carcinogenesis. Steroids 2018; 135:9-20. [PMID: 29678446 DOI: 10.1016/j.steroids.2018.04.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 04/02/2018] [Accepted: 04/12/2018] [Indexed: 12/12/2022]
Abstract
Chronic inflammation is associated to 25% of cancer cases according to epidemiological data. Therefore, inhibition of inflammation-induced carcinogenesis can be an efficient therapeutic approach for cancer chemoprevention in drug development studies. It is also determined that anti-inflammatory drugs reduce cancer incidence. Cell culture-based in vitro screening methods are used as a fast and efficient method to investigate the biological activities of the biomolecules. In addition, saponins are molecules that are isolated from natural sources and are known to have potential for tumor inhibition. Studies on the preparation of analogues of cycloartane-type sapogenols (9,19-cyclolanostanes) have so far been limited. Therefore we have decided to direct our efforts toward the exploration of new anti-tumor agents prepared from cycloastragenol and its production artifact astragenol. The semi-synthetic derivatives were prepared mainly by oxidation, condensation, alkylation, acylation, and elimination reactions. After preliminary studies, five sapogenol analogues, two of which were new compounds (2 and 3), were selected and screened for their inhibitory activity on cell viability and NFκB signaling pathway activity in LNCaP prostate cancer cells. We found that the astragenol derivatives 1 and 2 as well as cycloastragenol derivatives 3, 4, and 5 exhibited strong inhibitory activity on NFκB signaling leading the repression of NFκB transcriptional activation and suppressed cell proliferation. The results suggested that these molecules might have significant potential for chemoprevention of prostate carcinogenesis induced by inflammatory NFκB signaling pathway.
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Affiliation(s)
- Bilge Debeleç-Bütüner
- Ege University, Faculty of Pharmacy, Department of Pharmaceutical Biotechnology, Izmir, Turkey.
| | - Mert Burak Öztürk
- Ege University, Faculty of Engineering, Department of Bioengineering, Cancer Biology Laboratory, Izmir, Turkey
| | - Özgür Tağ
- Ege University, Graduate School of Natural and Applied Sciences, Department of Chemistry, Izmir, Turkey
| | - İsmail Hakkı Akgün
- Ege University, Faculty of Engineering, Department of Bioengineering, Izmir, Turkey
| | - Günay Yetik-Anacak
- Ege University, Faculty of Pharmacy, Department of Pharmacology, Izmir, Turkey
| | - Erdal Bedir
- Ege University, Faculty of Engineering, Department of Bioengineering, Izmir, Turkey.
| | - Kemal Sami Korkmaz
- Ege University, Faculty of Engineering, Department of Bioengineering, Cancer Biology Laboratory, Izmir, Turkey
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Li HF, Xu F, Yang P, Liu GX, Shang MY, Wang X, Yin J, Cai SQ. Systematic screening and characterization of prototype constituents and metabolites of total astragalosides using HPLC-ESI-IT-TOF-MS n after oral administration to rats. J Pharm Biomed Anal 2017; 142:102-112. [DOI: 10.1016/j.jpba.2017.05.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Revised: 04/29/2017] [Accepted: 05/04/2017] [Indexed: 01/23/2023]
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