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Assefa T, Tesso H, Ramachandran VP, Guta L, Demissie TB, Ombito JO, Eswaramoorthy R, Melaku Y. In Silico Molecular Docking Analysis, Cytotoxicity, and Antibacterial Activities of Constituents of Fruits of Cucumis dipsaceus. ACS Omega 2024; 9:1945-1955. [PMID: 38222496 PMCID: PMC10785779 DOI: 10.1021/acsomega.3c08866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 11/29/2023] [Accepted: 11/30/2023] [Indexed: 01/16/2024]
Abstract
Cucumis dipsaceus (Cucurbitaceae) is a plant traditionally used against diarrhea, teeth-ach, wounds, stomach ache, meningitis, and cancer. The extracts of C. dipsaceus after silica gel column chromatography gave nine compounds identified using spectroscopic methods such as hexacosane (1), octadecane (2), 17-(-5-ethyl-2,6-dihydroxy-6-methylhept-3-en-2-yl)-9-(hydroxymethyl)-13-methylcyclopenta[α]phenanthren-3-ol (3), erythrodiol (4), (9,12)-propyl icosa-9,12-dienoate (5), α-spinasterol (6), 16-dehydroxycucurbitacin (7), cucurbitacin D (8), and 23,24-dihydroisocucurbitacin D (9). Compounds 3 and 4 are new to the genus Cucumis. α-Spinasterol showed better inhibition zone diameter = 13.67 ± 0.57, 15.00 ± 0.10, and 13.33 ± 0.57 mm against Escherichia coli, Pseudomonas aeruginosa, and Streptococcus pyogenes compared with the other tested samples. α-Spinasterol (-8.0 kcal/mol) and 3 (-7.6 kcal/mol) displayed high binding affinity against DNA Gyrase compared to ciprofloxacin (-7.3 kcal/mol). α-Spinasterol and 16-dehydroxycucurbitacin showed better binding affinity against protein kinase. The cytotoxicity results revealed that the EtOAc extract showed the highest potency with IC50 = 16.05 μg/mL. 16-Dehydroxycucurbitacin showed a higher binding affinity (-7.7 kcal/mol) against human topoisomerase IIβ than etoposide. The cytotoxicity and antibacterial activities and in silico molecular docking analysis displayed by the constituents corroborate the traditional use of the plant against bacteria and cancer.
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Affiliation(s)
- Teshale Assefa
- Department
of Applied Chemistry, Adama Science and
Technology University, P.O. Box, Adama 1888, Ethiopia
| | - Hailemichael Tesso
- Department
of Applied Chemistry, Adama Science and
Technology University, P.O. Box, Adama 1888, Ethiopia
| | | | - Leta Guta
- Department
of Applied Biology, Adama Science and Technology
University, P.O. Box, Adama 1888, Ethiopia
| | - Taye B. Demissie
- Department
of Chemistry, University of Botswana, Gaborone P/Bag 00704, Botswana
| | - Japheth O. Ombito
- Department
of Chemistry, University of Botswana, Gaborone P/Bag 00704, Botswana
| | - Rajalakshmanan Eswaramoorthy
- Department
of Biomaterials, S Aveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences
(SIMATS), Saveetha University, Chennai 600 077, India
| | - Yadessa Melaku
- Department
of Applied Chemistry, Adama Science and
Technology University, P.O. Box, Adama 1888, Ethiopia
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Kgakatsi NA, Majinda RRT, Masesane IB, Nwamadi MS, Demissie TB, Ombito JO, Gobe I. New isoflavan from Erythrina livingstoniana. Nat Prod Res 2024; 38:493-502. [PMID: 36190792 DOI: 10.1080/14786419.2022.2130300] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 09/21/2022] [Indexed: 10/10/2022]
Abstract
Chemical investigation of the root wood of Erythrina livingstoniana led to the isolation of one previously undescribed isoflavan (3S,3″R)-7-hydroxy-2'-methoxy-[3″-hydroxy-2″,2″-dimethylpyrano (3',4')] isoflavan 1, together with eleven known compounds 2-12. The structure of compound 1 was elucidated on the basis of extensive spectroscopic and spectrometric analyses (1 D and 2 D-NMR and APCI-HRMS), with absolute configurations established by comparison of experimental and DFT calculated ECD data. The assignment of the absolute configurations of C-3 and C-3″ of compounds 2 and 3, respectively, were reported for the first time. Compounds 1 - 4 were evaluated for their antibacterial activities in vitro against E. coli ATCC 25922 and S. aureus ATCC 25923. Compound 1 exhibited moderate antibacterial activity with MIC value of 0.063 mg/mL against the clinically relevant risk-group 2 (RG-2) bacterium S. aureus.
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Affiliation(s)
- Nayang A Kgakatsi
- Department of Chemistry, University of Botswana, Gaborone, Botswana
- Boitekanelo College, Gaborone, Botswana
| | | | | | | | - Taye B Demissie
- Department of Chemistry, University of Botswana, Gaborone, Botswana
| | - Japheth O Ombito
- Department of Chemistry, University of Botswana, Gaborone, Botswana
| | - Irene Gobe
- Department of Medical Laboratory Science, University of Botswana, Gaborone, Botswana
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Alem MB, Desalegn T, Damena T, Alemayehu Bayle E, Koobotse MO, Ngwira KJ, Ombito JO, Zachariah M, Demissie TB. Cytotoxicity and Antibacterial Potentials of Mixed Ligand Cu(II) and Zn(II) Complexes: A Combined Experimental and Computational Study. ACS Omega 2023; 8:13421-13434. [PMID: 37065050 PMCID: PMC10099420 DOI: 10.1021/acsomega.3c00916] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Accepted: 03/20/2023] [Indexed: 06/19/2023]
Abstract
[Cu(C15H9O4)(C12H8N2)O2C2H3]·3H2O (1) and [Zn(C15H9O4)(C12H8N2)]O2C2H3 (2) have been synthesized and characterized by ultraviolet-visible (UV-vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, mass spectrometry, thermogravimetric analysis/differential thermal analysis (TGA/DTA), X-ray diffraction (XRD), scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDX), and molar conductance, and supported by density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations. Square pyramidal and tetrahedral geometries are proposed for Cu(II) and Zn(II) complexes, respectively, and the XRD patterns showed the polycrystalline nature of the complexes. Furthermore, in vitro cytotoxic activity of the complexes was evaluated against the human breast cancer cell line (MCF-7). A Cu(II) centered complex with an IC50 value of 4.09 μM was more effective than the Zn(II) centered complex and positive control, cisplatin, which displayed IC50 values of 75.78 and 18.62 μM, respectively. In addition, the newly synthesized complexes experienced the innate antioxidant nature of the metal centers for scavenging the DPPH free radical (up to 81% at 400 ppm). The biological significance of the metal complexes was inferred from the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) energy band gap, which was found to be 2.784 and 3.333 eV, respectively for 1 and 2, compared to the ligands, 1,10-phenathroline (4.755 eV) and chrysin (4.403 eV). Moreover, the molecular docking simulations against estrogen receptor alpha (ERα; PDB: 5GS4) were strongly associated with the in vitro biological activity results (E B and K i are -8.35 kcal/mol and 0.76 μM for 1, -7.52 kcal/mol and 3.07 μM for 2, and -6.32 kcal/mol and 23.42 μM for cisplatin). However, more research on in vivo cytotoxicity is suggested to confirm the promising cytotoxicity results.
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Affiliation(s)
- Mamaru Bitew Alem
- Department
of Applied Chemistry, Adama Science and
Technology University, P.O.Box 1888, Adama 251, Ethiopia
| | - Tegene Desalegn
- Department
of Applied Chemistry, Adama Science and
Technology University, P.O.Box 1888, Adama 251, Ethiopia
| | - Tadewos Damena
- Department
of Chemistry, Wachemo University, P.O.Box 667, Hossana 667, Ethiopia
| | - Enyew Alemayehu Bayle
- Graduate
Institute of Applied Science and Technology, National Taiwan University of Science and Technology, 10607 Taipei, Taiwan
- Department
of Chemistry, Debre Markos University, P.O. Box 269, Debre Markos 269, Ethiopia
| | - Moses O. Koobotse
- School
of Allied Health Professions, University
of Botswana, P/bag UB, 0022 Gaborone, Botswana
| | - Kennedy J. Ngwira
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, PO Wits, 2050 Johannesburg, South Africa
| | - Japheth O. Ombito
- Department
of Chemistry, University of Botswana, P/bag UB, 0022 Gaborone, Botswana
| | - Matshediso Zachariah
- School
of Allied Health Professions, University
of Botswana, P/bag UB, 0022 Gaborone, Botswana
| | - Taye B. Demissie
- Department
of Chemistry, University of Botswana, P/bag UB, 0022 Gaborone, Botswana
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Alem MB, Desalegn T, Damena T, Bayle EA, Koobotse MO, Ngwira KJ, Ombito JO, Zachariah M, Demissie TB. Organic-inorganic hybrid salt and mixed ligand Cr(III) complexes containing the natural flavonoid chrysin: Synthesis, characterization, computational, and biological studies. Front Chem 2023; 11:1173604. [PMID: 37123873 PMCID: PMC10130586 DOI: 10.3389/fchem.2023.1173604] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 03/24/2023] [Indexed: 05/02/2023] Open
Abstract
Organic-inorganic hybrid salt and mixed ligand Cr(III) complexes (Cr1 and Cr2) containing the natural flavonoid chrysin were synthesized. The metal complexes were characterized using UV-Vis, Fourier-transform infrared, MS, SEM-EDX, XRD, and molar conductance measurements. Based on experimental and DFT/TD-DFT calculations, octahedral geometries for the synthesized complexes were suggested. The powder XRD analysis confirms that the synthesized complexes were polycrystalline, with orthorhombic and monoclinic crystal systems having average crystallite sizes of 21.453 and 19.600 nm, percent crystallinities of 51% and 31.37%, and dislocation densities of 2.324 × 10-3 and 2.603 × 10-3 nm-2 for Cr1 and Cr2, respectively. The complexes were subjected to cytotoxicity, antibacterial, and antioxidant studies. The in vitro biological studies were supported with quantum chemical and molecular docking computational studies. Cr1 showed significant cytotoxicity to the MCF-7 cell line, with an IC50 value of 8.08 μM compared to 30.85 μM for Cr2 and 18.62 μM for cisplatin. Cr2 showed better antibacterial activity than Cr1. The higher E HOMO (-5.959 eV) and dipole moment (10.838 Debye) values of Cr2 obtained from the quantum chemical calculations support the observed in vitro antibacterial activities. The overall results indicated that Cr1 is a promising cytotoxic drug candidate.
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Affiliation(s)
- Mamaru Bitew Alem
- Department of Applied Chemistry, Adama Science and Technology University, Adama, Ethiopia
- *Correspondence: Mamaru Bitew Alem, , Tegene Desalegn, , Taye B. Demissie,
| | - Tegene Desalegn
- Department of Applied Chemistry, Adama Science and Technology University, Adama, Ethiopia
- *Correspondence: Mamaru Bitew Alem, , Tegene Desalegn, , Taye B. Demissie,
| | - Tadewos Damena
- Department of Chemistry, Wachemo University, Hossana, Ethiopia
| | - Enyew Alemayehu Bayle
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan
- Department of Chemistry, Debre Markos University, Debre Markos, Ethiopia
| | - Moses O. Koobotse
- School of Allied Health Professions, University of Botswana, Gaborone, Botswana
| | - Kennedy J. Ngwira
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa
| | | | | | - Taye B. Demissie
- Department of Chemistry, University of Botswana, Gaborone, Botswana
- *Correspondence: Mamaru Bitew Alem, , Tegene Desalegn, , Taye B. Demissie,
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Degfie T, Ombito JO, Demissie TB, Eswaramoorthy R, Dekebo A, Endale M. Antibacterial and Antioxidant Activities, in silico Molecular Docking, ADMET and DFT Analysis of Compounds from Roots of Cyphostemma cyphopetalum. Adv Appl Bioinform Chem 2022; 15:79-97. [PMID: 36330228 PMCID: PMC9624657 DOI: 10.2147/aabc.s377336] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 09/28/2022] [Indexed: 11/06/2022] Open
Abstract
Background Cyphostemma cyphopetalum is a medicinal plant traditionally used to treat various ailments. Limited studies on C. cyphopetalum inspired us to investigate the chemical nature and therapeutic potential of the plant. Methods Silica gel column chromatographic separation was used for isolation. 1D and 2D NMR spectroscopic analysis and literature data were used for structural elucidation. Agar well diffusion assay was used for evaluation of antibacterial activity against E. coli, P. aeruginosa, and S. aureus. DPPH assay was used to evaluate radical scavenging activities. Molecular docking was done by AutoDock Vina 4.2 open-source program. DFT calculations were performed using the Gaussian 16 program package. Results Dichloromethane/methanol (1:1) roots extract afforded a new hydroxyl-spongiane diterpenoid lactone derivative, 3-hydroxyisoagatholactone (1), along with β-sitosterol (2) and ε-viniferin (3) whereas methanol extract afforded trans-resveratrol (4), gnetin H (5), tricuspidatol A (6), ε-viniferin-diol (7) and parthenostilbenin B (8). At 50 μg/mL, compound 3 recorded the highest inhibition against E. coli (8.55 ± 0.45 mm) and S. aureus (9.30 ±1.39 mm). Against P. aeruginosa, compound 5 consistently outperformed chloramphenicol (11.76 ± 0.77 mm, at 30 g/mL). Maximum binding affinity were observed by compound 3 against DNA gyrase B (-7.6 kcal/mol) where as compound 5 displayed maximum binding against PqsA (-8.8 kcal/mol) and S. aureus PK (-5.8 kcal/mol). Compounds 1, 3 and 4 satisfy Lipinski’s rule of five. Trans-resveratrol (4) demonstrated strong DPPH scavenging activity at 12.5 g/mL, with IC50 values of 0.052 µg/mL, compared to ascorbic acid (IC50 value of 0.0012 µg/mL). Conclusion In this work, eight compounds were identified from the roots extracts of C. cyphopetalum including a new hydroxyl-spongiane diterpenoid lactone, 3-hydroxyisoagatholactone (1). Compounds 3 and 5 exhibited good antibacterial activity and binding affinities. The docking result is in agreement with the invitro antibacterial study. Overall, the study result suggests that the isolated compounds have the potential to be used as therapeutic agents, which supports the traditional uses of C. cyphpetalum roots.
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Affiliation(s)
- Teshome Degfie
- Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University, Adama, Ethiopia
| | - Japheth O Ombito
- Department of Chemistry, University of Botswana, Gaborone, Botswana
| | - Taye B Demissie
- Department of Chemistry, University of Botswana, Gaborone, Botswana
| | - Rajalakshmanan Eswaramoorthy
- Department of Biomaterials, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India
| | - Aman Dekebo
- Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University, Adama, Ethiopia,Institute of Pharmaceutical Sciences, Adama Science and Technology University, Adama, Ethiopia
| | - Milkyas Endale
- Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University, Adama, Ethiopia,Correspondence: Milkyas Endale; Teshome Degfie, Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University, P.O. Box 1888, Adama, Ethiopia, Email ;
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Alem MB, Damena T, Desalegn T, Koobotse M, Eswaramoorthy R, Ngwira KJ, Ombito JO, Zachariah M, Demissie TB. Cytotoxic mixed-ligand complexes of Cu(II): A combined experimental and computational study. Front Chem 2022; 10:1028957. [PMID: 36247670 PMCID: PMC9557196 DOI: 10.3389/fchem.2022.1028957] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 09/12/2022] [Indexed: 01/08/2023] Open
Abstract
Herein, we report the synthesis of mixed-ligand Cu(II) complexes of metformin and ciprofloxacin drugs together with 1,10-phenanthroline as a co-ligand. The synthesized complexes were characterized using different spectroscopic and spectrometric techniques. In vitro cytotoxic activity against human breast adenocarcinoma cancer cell line (MCF-7) as well as antibacterial activity against two gram-negative and two gram-positive bacterial strains were also investigated. The analyses of the experimental results were supported using quantum chemical calculations and molecular docking studies against estrogen receptor alpha (ERα; PDB: 5GS4). The cytotoxicity of the [Cu(II) (metformin) (1,10-phenanthroline)] complex (1), with IC50 of 4.29 µM, and the [Cu(II) (ciprofloxacin) (1,10-phenanthroline)] complex (2), with IC50 of 7.58 µM, were found to be more effective than the referenced drug, cisplatin which has IC50 of 18.62 µM against MCF-7 cell line. The molecular docking analysis is also in good agreement with the experimental results, with binding affinities of –7.35, –8.76 and –6.32 kcal/mol, respectively, for complexes 1, 2 and cisplatin against ERα. Moreover, complex 2 showed significant antibacterial activity against E. coli (inhibition diameter zone, IDZ, = 17.3 mm), P. aeruginosa (IDZ = 17.08 mm), and S. pyogen (IDZ = 17.33 mm), at 25 μg/ml compared to ciprofloxacin (IDZ = 20.0, 20.3, and 21.3 mm), respectively. Our BOILED-egg model indicated that the synthesized metal complexes have potentially minimal neurotoxicity than that of cisplatin.
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Affiliation(s)
- Mamaru Bitew Alem
- Department of Applied Chemistry, Adama Science and Technology University, Adama, Ethiopia,*Correspondence: Mamaru Bitew Alem, ; Tegene Desalegn, ; Taye B. Demissie,
| | - Tadewos Damena
- Department of Applied Chemistry, Adama Science and Technology University, Adama, Ethiopia
| | - Tegene Desalegn
- Department of Applied Chemistry, Adama Science and Technology University, Adama, Ethiopia,*Correspondence: Mamaru Bitew Alem, ; Tegene Desalegn, ; Taye B. Demissie,
| | - Moses Koobotse
- School of Allied Health Professions, University of Botswana, Gaborone, Botswana
| | - Rajalakshmanan Eswaramoorthy
- Department of Biomaterials, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India
| | - Kennedy J. Ngwira
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa
| | | | | | - Taye B. Demissie
- Department of Chemistry, University of Botswana, Gaborone, Botswana,*Correspondence: Mamaru Bitew Alem, ; Tegene Desalegn, ; Taye B. Demissie,
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Mbaveng AT, Chi GF, Bonsou IN, Ombito JO, Yeboah SO, Kuete V, Efferth T. Cytotoxic phytochemicals from the crude extract of Tetrapleura tetraptera fruits towards multi-factorial drug resistant cancer cells. J Ethnopharmacol 2021; 267:113632. [PMID: 33253828 DOI: 10.1016/j.jep.2020.113632] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [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: 06/05/2020] [Revised: 08/20/2020] [Accepted: 11/22/2020] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Tetrapleura tetraptera is an African medicinal spice used in traditional medicine to treat several ailments including cancer. AIM OF THE STUDY The present study was designed to evaluate the cytotoxicity of the dichloromethane-methanol (1:1) extract of the fruits of Tetrapleura tetraptera (TTF) and its constituents: (3R, 4S)-3,4-dimethyloxetan-2-one (1), luteolin (2), stigmasterol (4), 3-O-[6'-O-undecanoyl-β-D-glucopyranosyl]stigmasterol (6), olean-12-en-3-β-O-D-glucopyranoside (7), 3-O-β-D-glucopyranosyl-(1 → 6)-β-D-glucopyranosylurs-12-en-28-oic acid (8), 3-O-β-D-glucopyranosyl-(1 → 3)-β-D-glucopyranosyl-27-hydroxyolean-12-ene-28-oic acid (9), methyl-O-β-D-glucopyranoside (10), β-D-fructofuranosyl-(2 → 1)-β-D-glucopyranoside (11) towards a panel of cancer cell lines including MDR phenotypes. The cellular mode of induction of apoptosis by TTF and compound 7 was further investigated. MATERIALS AND METHODS The resazurin reduction assay (RRA) was applied to determine the cytotoxicity of the studied samples. The cell cycle (PI staining), apoptosis (annexin V/PI staining), mitochondrial membrane potential (MMP; JC-1) and reactive oxygen species (ROS; H2DCFH-DA) were measured by flow cytometry. Column chromatography was used for the purification of TTF, whilst nuclear magnetic resonance (NMR) spectroscopic analysis was applied for structural elucidation. RESULTS The botanical, TTF and the phytochemicals, 2, 7, 8 and 9 as well as doxorubicin exerted cytotoxicity against 9 cancer cell lines including drug-sensitive and drug resistant phenotypes. TTF, compound 7 and doxorubicin were the most active samples, and displayed IC50 values ranging from 10.27 μg/mL (in CCRF-CEM leukemia cells) to 23.61 μg/mL (against HCT116 p53-/- colon adenocarcinoma cells) for TTF, from 4.76 μM (against CCRF-CEM cells) to 12.92 μM (against HepG2 hepatocarcinoma cells) for compound 7, and from 0.02 μM (against CCRF-CEM cells) to 122.96 μM (against CEM/ADR5000 cells) for doxorubicin. TTF induced apoptosis in CCRF-CEM cells through MMP alteration and increased ROS production while compound 7 induced apoptosis mediated by caspases activation, MMP alteration and increased ROS production. CONCLUSION Tetrapleura tetraptera and some of its constituents, mostly compound 7 are good cytotoxic natural products that should be explored in depth to develop new drugs to fight cancers.
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Affiliation(s)
- Armelle T Mbaveng
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128, Mainz, Germany; Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon.
| | - Godloves F Chi
- Department of Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon.
| | - Idrios N Bonsou
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon.
| | - Japheth O Ombito
- Department of Chemistry, University of Botswana, Private Bag 0022, Gaborone, Botswana.
| | - Samuel O Yeboah
- Department of Chemistry, University of Botswana, Private Bag 0022, Gaborone, Botswana.
| | - Victor Kuete
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128, Mainz, Germany; Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon.
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128, Mainz, Germany.
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Ombito JO, Bojase G, R.T. Majinda R, B. Masesane I, Schüffler A, Pusch S, Weber C, Opatz T. Chemical constituents of the root wood of Erythrina sacleuxii and determination of the absolute configuration of suberectin. B CHEM SOC ETHIOPIA 2020. [DOI: 10.4314/bcse.v34i1.12] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Phytochemical investigation on the root wood of Erythrina sacleuxii (Leguminosae) led to the isolation of nine secondary metabolites (1-9). Compound 1 was isolated from the genus Erythrina for the first time. The pure compounds were identified on the basis of comprehensive spectroscopic and spectrometric analyses, while their absolute configurations were determined based on chiroptical measurements. Compounds 5 and 6 showed weak antifungal activity against Pyricularia oryzae with MIC values of 20 µg/mL.
Bull. Chem. Soc. Ethiop. 2020, 34(1), 135-140.
DOI: https://dx.doi.org/10.4314/bcse.v34i1.12
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Ombito JO, Bojase G, Majinda RR, Masesane IB, Schüffler A, Opatz T. Erysacleuxins C and D, new isoflavones from the twigs of Erythrina sacleuxii Hua and their cytotoxic activity. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2019.05.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Abstract
The β-lactams constitute a well-known class of compounds having tremendous biological significance. Besides being a motif of biological interest, they serve as versatile synthons in organic chemistry. In fact, their easy accessibility in the laboratory by several methods combined with inherent reactivity of the β -lactam ring due to ring-strain places it among the most sought for substrate in the arsenal of synthetic organic chemists. Several chemical reagents, heat, and light promote its ring-opening, ring-expansions and rearrangement reactions yielding a wide variety of biologically relevant nitrogen-containing acyclic and heterocyclic compounds. In recent years, the reactivity of differently functionalized β-lactam rings towards diverse kinds of reagents has been investigated. These investigations exploit selective bond cleavage of the β-lactam nucleus via N1-C2, C3- C4, C2-C3 or N1-C4 bond cleavage using simple reagents. The reduction of amide carbonyl group, thionation, and pyrolysis/photolysis have also been explored. These investigations have led to the discovery of many easy synthetic methods for biologically important classes of compounds such as β-amino acids, β-amino esters, amino sugars, amino alcohols, peptides, azetidines, and other heterocyclic compounds. This article discusses the advances made in the studies on the reactivity of β- lactam ring during the last ten years.
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Affiliation(s)
- Japheth O. Ombito
- Chemistry Department, University of Botswana, P. Bag: 0022, Gaborone, Botswana
| | - Girija S. Singh
- Chemistry Department, University of Botswana, P. Bag: 0022, Gaborone, Botswana
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