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Nguemdjo Chimeze VW, Bankoglu EE, Zühlke S, Fannang VS, Eckelmann D, Chi Shirri J, Djuidje EN, Djama CM, Stopper H, Wandji J. Cytotoxic and genotoxic properties of artathomsonine, a new oxoberberine alkaloid from Artabotrys thomsonii (annonaceae). Nat Prod Res 2022; 36:2791-2799. [PMID: 34000924 DOI: 10.1080/14786419.2021.1928117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 02/22/2021] [Revised: 04/28/2021] [Accepted: 05/04/2021] [Indexed: 10/21/2022]
Abstract
A phytochemical investigation of the liana of Artabotrys thomsonii led to the isolation of a new oxoberberine alkaloid, 2,10-dihydroxy-3,9-dimethoxy-8-oxo-protoberberine (7), along with six known compounds. Their chemical structures were elucidated by 1 D and 2 D NMR spectroscopic methods and HRESI-MSn data analysis. Compounds 4 and 7 were selected for further in vitro investigations. In accordance with expectations from their chemical structures, compounds 7 and 4 showed a clear antioxidant activity in a cell-free assay, with compound 7 being 7-fold more active than 4. Cytotoxicity, cytostatic and genotoxic effects only occurred at high micromolar concentrations of 50 µM or more. Compound 7 was slightly less effective than compound 4. A low micromolar concentration of 10 µM did not cause any damaging cellular effects but showed potential for a protection against the micronucleus-inducing effect of reactive oxygen species hydrogen peroxide, although not to a significant extent.
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Affiliation(s)
- Valery Wilfried Nguemdjo Chimeze
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
- Laboratory of Natural Products and Heterocyclic Synthesis, Department of Organic Chemistry, Faculty of Sciences, University of Yaounde I, Yaounde, Cameroon
| | - Ezgi Eyluel Bankoglu
- Institute of Pharmacology and Toxicology, University of Wuerzburg, Wuerzburg, Germany
| | - Sebastian Zühlke
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
| | - Véronique Simone Fannang
- Department of Pharmacy, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala, Cameroon
| | - Dennis Eckelmann
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
| | - Jovita Chi Shirri
- Department of Chemistry, Faculty of Sciences, University of Buea, Buea, Cameroon
| | | | - Céline Mbazoa Djama
- Laboratory of Natural Products and Heterocyclic Synthesis, Department of Organic Chemistry, Faculty of Sciences, University of Yaounde I, Yaounde, Cameroon
| | - Helga Stopper
- Institute of Pharmacology and Toxicology, University of Wuerzburg, Wuerzburg, Germany
| | - Jean Wandji
- Laboratory of Natural Products and Heterocyclic Synthesis, Department of Organic Chemistry, Faculty of Sciences, University of Yaounde I, Yaounde, Cameroon
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Akak CM, Djama CM, Nkengfack AE, Tu PF, Lei LD. New coumarin glycosides from the leaves of Diospyros crassiflora (Hiern). Fitoterapia 2010; 81:873-7. [PMID: 20580922 DOI: 10.1016/j.fitote.2010.05.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2010] [Revised: 05/18/2010] [Accepted: 05/19/2010] [Indexed: 10/19/2022]
Abstract
Two new 5-methylcoumarin glycosides named diosfeboside A (1) and B (2) and five known compounds namely kaempferol 3-O-α-L-rhamnopyranosyl-(1 → 2)-β-D-glucopyranoside (3), ursolic acid (4), betulinic acid (5), stigmasterol (6) and stigmasterol 3-O-β-D-glucopyranoside (7) were isolated from the leaves of Diospyros crassiflora (Hiern). Their structures were established through interpretation of 1 and 2D NMR, mass spectra analysis and comparison with reported data. In vitro cytotoxic activity of the new compounds against human carcinoma cell lines (HL-60, Bel-7402, BGC-823, and KB) was evaluated and no cytotoxicity was observed for each of them.
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Affiliation(s)
- Carine Mvot Akak
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, P.O. Box: 812, Yaounde, Cameroon.
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Chiozem DD, Trinh-Van-Dufat H, Wansi JD, Mbazoa Djama C, Fannang VS, Seguin E, Tillequin F, Wandji J. New friedelane triterpenoids with antimicrobial activity from the stems of Drypetes paxii. Chem Pharm Bull (Tokyo) 2009; 57:1119-22. [PMID: 19801870 DOI: 10.1248/cpb.57.1119] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two new friedelane-type triterpenes named 12alpha-hydroxyfriedelane-3,15-dione and 3beta-hydroxyfriedelan-25-al, together with six known compounds were isolated from the stems of Drypetes paxii Hutch. (Euphorbiaceae). Their structures were established on the basis of conventional 1 dimensional (1D) NMR methods, 2D shift-correlated NMR experiments and mass spectra. The five friedelane-type triterpene derivatives and one olean-12-ene triterpene saponin were tested for antimicrobial activity against some gram-positive and gram-negative bacteria, and they appeared to be modestly active.
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Affiliation(s)
- David Dako Chiozem
- Laboratoire de Synthèse et de Substances Naturelles, Département de Chimie Organique de l'Université de Yaoundé-1, Faculté des Sciences, Cameroon
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