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Elbermawi A, Ali AR, Amen Y, Ashour A, Ahmad KF, Mansour ESS, Halim AF. Anti-diabetic activities of phenolic compounds of Alternaria sp., an endophyte isolated from the leaves of desert plants growing in Egypt. RSC Adv 2022; 12:24935-24945. [PMID: 36199870 PMCID: PMC9434606 DOI: 10.1039/d2ra02532a] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 08/23/2022] [Indexed: 11/21/2022] Open
Abstract
Six phenolic compounds (talaroflavone (1), alternarienoic acid (2), altenuene (3), altenusin (4), alternariol (5), and alternariol-5-O-methyl ether (6)) were isolated from the solid rice culture media of Alternaria sp., an endophyte isolated from the fresh leaves of three desert plants, Lycium schweinfurthii Dammer (Solanaceae), Pancratium maritimum L. (Amaryllidaceae) and Cynanchum acutum L. (Apocynaceae). Compounds 2, 3, and 4 exhibited potent α-glucosidase and lipase inhibitory activities suggesting that they might act as naturally occurring anti-diabetic candidates. The same compounds showed potent binding in the active site for both enzymes with desirable pharmacokinetic properties. The isolated bioactive compounds were not exclusive to a certain host plant which reveals the dominant ecological standpoints for consequent optimization. This could lead to a cost-effective and reproducible yield applicable to commercial scale-up. Six phenolic compounds were isolated from the solid rice culture media of Alternaria sp., an endophyte isolated from the leaves of three desert plants, Lycium schweinfurthii Dammer (Solanaceae), Pancratium maritimum L. (Amaryllidaceae) and Cynanchum acutum L. (Apocynaceae).![]()
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Affiliation(s)
- Ahmed Elbermawi
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, 35516 Egypt
| | - Ahmed R. Ali
- Department of Medicinal Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
| | - Yhiya Amen
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, 35516 Egypt
| | - Ahmed Ashour
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, 35516 Egypt
| | - Kadria F. Ahmad
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, 35516 Egypt
| | - El-Sayed S. Mansour
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, 35516 Egypt
| | - Ahmed F. Halim
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, 35516 Egypt
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Elbermawi A, Halim AF, Mansour ESS, Ahmad KF, Elsbaey M, Ashour A, Amen Y, El-Gamil MM, Tomofumi M, Shimizu K. Lycium schweinfurthii: new secondary metabolites and their cytotoxic activities. Nat Prod Res 2021; 36:5134-5141. [PMID: 34180314 DOI: 10.1080/14786419.2021.1922902] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Two new compounds, 11S-methoxy-11,12-dihydro phytuberin (2) and 9S-methoxy-benzocyclononan-7-one (6), together with twenty-six known ones were isolated from Lycium schweinfurthii (Solanaceae). Their planar structure was established by extensive spectroscopic analyses. The absolute configuration of compound 6 was determined by time dependent density functional theory calculations (TDDFT). The cytotoxic potential of the isolates was assessed in cultured skin cancer (G-361) and colon cancer (HCT-116 and CaCo-2) cell lines. Certain flavonoids showed the highest cytotoxic activity, with IC50 values ranging from 7.1 to 63.3 µM; meanwhile 5-flurouracil showed IC50 values ranging from 62.4 to >100 µM. All compounds showed minimal toxicity towards normal cells from skin (NHDF-4) and colon (CCD-841), indicating their potential selectivity and safety as cytotoxic candidates.
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Affiliation(s)
- Ahmed Elbermawi
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Division of Systematic Forest and Forest Products Sciences, Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Ahmed F Halim
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - El-Sayed S Mansour
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Kadria F Ahmad
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Marwa Elsbaey
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Division of Systematic Forest and Forest Products Sciences, Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Ahmed Ashour
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Division of Systematic Forest and Forest Products Sciences, Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Yhiya Amen
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Division of Systematic Forest and Forest Products Sciences, Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Mohammed M El-Gamil
- Department of Toxic and Narcotic Drugs, Forensic Medicine, Mansoura Laboratory, Medico-legal Organization, Ministry of Justice, Mansoura, Egypt
| | - Miyamoto Tomofumi
- Department of Natural Products Chemistry, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Kuniyoshi Shimizu
- Division of Systematic Forest and Forest Products Sciences, Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
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Helal IE, Elsbaey M, Zaghloul AM, Mansour ESS. A new homoisoflavan from Dracaena cinnabari Balf. f. resin: α-glucosidase and COX-II inhibitory activity. Nat Prod Res 2021; 36:1224-1229. [PMID: 33427506 DOI: 10.1080/14786419.2020.1869229] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A new homoisoflavan, identified as (3 R)-7-hydroxy-3',4'-methylenedioxyhomoisoflavan, was isolated from Dracaena cinnabari Balf. f. resin. The structure was elucidated by one- and two-dimensional NMR spectroscopy as well as high resolution mass spectrometry. In addition, a diverse group of flavonoids were isolated, representing homoisoflavans, flavans, flavanones, chalcones and dihydrochalcones. The compounds were evaluated for their α-glucosidase and COX-II inhibition activity. The obtained IC50 values of the tested flavonoids gave an insight about some key structural features to their α-glucosidase and COX-II inhibitory activity. For α-glucosidase inhibitory activity, a flavanone skeleton was favorable over a flavan. For COX-II inhibition, the introduction of a fused heterocyclic ring at the homoisoflavan skeleton enhanced the activity.
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Affiliation(s)
- Iman E Helal
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Marwa Elsbaey
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Ahmed M Zaghloul
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - El-Sayed S Mansour
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
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Abstract
A new C-linked chalcone-dihydrochalcone dimer, named dracidione, was isolated from the ethyl acetate extract of dragon's blood resin of Dracaena cinnabari Balf. f. Structure elucidation of the new compound was carried out by means of one- and two-dimensional NMR spectroscopy in addition to high resolution mass spectrometry. The unique structure incorporated a chalcone and a dihydrochalcone, which is reported for the first time from nature. Furthermore, dracidione showed moderate α-glucosidase inhibitory activity with IC50= 40.27 µg/ml.
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Affiliation(s)
- Iman E Helal
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Marwa Elsbaey
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Ahmed M Zaghloul
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - El-Sayed S Mansour
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
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Elbermawi A, Halim AF, Mansour ESS, Ahmad KF, Ashour A, Amen Y, Shimizu K. A new glucoside with a potent α-glucosidase inhibitory activity from Lycium schweinfurthii. Nat Prod Res 2019; 35:976-983. [PMID: 31140302 DOI: 10.1080/14786419.2019.1616730] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A new glucoside, 3-methoxy-4-O-β-D-glucopyranosyl-methyl benzoate, has been isolated from Lycium schweinfurthii along with five known compounds through bioactivity guided fractionation of the total plant methanolic extract towards α-glucosidase inhibitory activity. All the isolated compounds were tested for their inhibitory effect on α-glucosidase enzyme. As a result, four of them showed a potent inhibitory activity and thus constitute a therapeutic approach to decrease postprandial hyperglycemia in diabetic patients.
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Affiliation(s)
- Ahmed Elbermawi
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Division of Systematic Forest and Forest Products Sciences, Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Ahmed F Halim
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - El-Sayed S Mansour
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Kadria F Ahmad
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Ahmed Ashour
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Division of Systematic Forest and Forest Products Sciences, Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Yhiya Amen
- Department of Pharmacognosy Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Division of Systematic Forest and Forest Products Sciences, Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Kuniyoshi Shimizu
- Division of Systematic Forest and Forest Products Sciences, Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
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Abstract
The composition of the essential oil of the fruits, leaves and stems of Daucus glaber Forssk has been studied by GC/MS. It was found that, the essential oil of the fruits consists of monoterpene hydrocarbons (limonene and sylvestrene are the majors) and phenylpropanoids (elemicin is the major). Sylvestrene has never been reported before in the essential oil of any Daucus species. The study of the essential oil of the leaves revealed the presence of monoterpene hydrocarbons; limonene and γ-terpinene are the majors and a small amount of sylvestrene. The essential oil of stems consists of monoterpene hydrocarbons (γ-terpinene is the major), terpene alcohols (mainly 4-terpineol) and phenylpropanoids (myristicin and elemicin are the majors). It is interesting that, the essential oil of the fruits is free from any oxygenated terpenes while that of the stems is free from limonene and sylvestrene which are present in the essential oil of the fruits and leaves in fairly large amounts. The essential oil of the fruits, leaves and stems shows broad antimicrobial activities against both gram positive and gram negative bacteria. In addition, the volatile oil of the stem, particularly, show activities against Candida albicans (yeast). Also, the prepared oils have variable cytotoxic activities with LC50 21.52, 36.01 and 42.34 μrg/ml. respectively.
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Affiliation(s)
- El-Sayed S. Mansour
- Pharmacognosy Department, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
| | - Galal T. Maatooq
- Pharmacognosy Department, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
| | - Ashraf T. Khalil
- Pharmacognosy Department, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
| | - El-Sayed M. Marwan
- Pharmacognosy Department, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
| | - Amal A. Sallam
- Pharmacognosy Department, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
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