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Dapkekar AB, Sreenivasulu C, Kishore DR, Satyanarayana G. Recent Advances Towards the Synthesis of Dihydrobenzofurans and Dihydroisobenzofurans. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | | | | | - Gedu Satyanarayana
- Indian Institute of Technology Hyderabad Chemistry KandiSangareddy District 502 285 Hyderabad INDIA
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2
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Fitoussi R, Branchet MC, Garnier N, Beauchef G, Nkengne A, Vié K, Boisnic S. A Harungana madagascariensis extract with retinol-like properties - Gene upregulations and protein expressions in human fibroblasts and skin explants. Int J Cosmet Sci 2022; 44:201-215. [PMID: 35238059 DOI: 10.1111/ics.12768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 02/08/2022] [Accepted: 02/21/2022] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Because they limit, even reverse, age-induced skin alterations, retinoids became a staple in cosmetology. However, their use can result in undesired secondary effects and there is a demand for natural sources of compounds with retinoid like effects. A preliminary screening identified a Harungana madagascariensis plant extract (HME) as possibly inducing genes stimulated by retinol. We analysed its effect on gene and protein expression, comparing it to retinoids. METHODS Gene expression was analysed by real-time qPCR on RNA from isolated fibroblasts subjected to retinol or the plant extract for 6, 48 or 96 hours. Skin markers were quantified in fibroblasts cultured with retinol or extract containing medium, and UV-aged skin explants subjected to topical applications of creams containing retinol, retinaldehyde or HME. RESULTS Real-time qPCR show that the extract induced all RARs and RXRs, even RXRγ that was not induced by retinol. Eighty-eight percent of the 25 early retinoid reaction genes induced by a concentration of retinol are induced by the extract. In fibroblasts, only the extract increased collagen III labelling, while collagen I and fibronectin labelling are increased by retinol and the extract, with higher levels for the extract. When topically applied to UV-aged skin explants, only the cream containing the HME led to increased labelling of CRABP1 in the epidermis. CRABP2 and Ki67 are induced by all three creams and no effect was detected on RXRs. In the dermis the extract containing cream increased CRABP2, total collagen, procollagen I and collagen I while creams with retinol or retinaldehyde only affected some of these proteins. CONCLUSIONS The HME induces an overall retinol-like gene induction profile in isolated fibroblasts and retinoid-like stimulation of protein synthesis in both isolated fibroblasts and photoaged skin explants.
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Affiliation(s)
- R Fitoussi
- Laboratoires Clarins, 5 rue Ampère, 95300, Pontoise, France
| | - M-C Branchet
- Laboratoire GREDECO, 45 boulevard Vincent Auriol, 75013, Paris, France
| | - N Garnier
- Laboratoires Clarins, 5 rue Ampère, 95300, Pontoise, France
| | - G Beauchef
- Laboratoires Clarins, 5 rue Ampère, 95300, Pontoise, France
| | - A Nkengne
- Laboratoires Clarins, 5 rue Ampère, 95300, Pontoise, France
| | - K Vié
- Laboratoires Clarins, 5 rue Ampère, 95300, Pontoise, France
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3
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Nurcahyanti ADR, Jap A, Lady J, Prismawan D, Sharopov F, Daoud R, Wink M, Sobeh M. Function of selected natural antidiabetic compounds with potential against cancer via modulation of the PI3K/AKT/mTOR cascade. Biomed Pharmacother 2021; 144:112138. [PMID: 34750026 DOI: 10.1016/j.biopha.2021.112138] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 08/19/2021] [Accepted: 08/31/2021] [Indexed: 12/12/2022] Open
Abstract
Diabetes mellitus (DM) is a metabolic disorder with growing global incidence, as 387 million people were diagnosed in 2014 with an expected projection of 642 million in 2040. Several complications are associated with DM including heart attack, stroke, kidney failure, blindness, and cancer. The latter is the second leading cause of death worldwide accounting for one in every six deaths, with liver, pancreas, and endometrium cancers are the most abundant among patients with diabetes. Phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt)/mammalian target of rapamycin (mTOR) pathway plays a vital role in developing a wide array of pathological disorders, among them diabetes and cancer. Natural secondary metabolites that counteract the deleterious effects of reactive oxygen species (ROS) and modulate PI3K/Akt/mTOR pathway could be a promising approach in cancer therapy. Here, 717 medicinal plants with antidiabetic activities were highlighted along with 357 bioactive compounds responsible for the antidiabetic activity. Also, 43 individual plant compounds with potential antidiabetic activities against cancer via the modulation of PI3K/Akt/mTOR cascade were identified. Taken together, the available data give an insight of the potential of repurposing medicinal plants and/or the individual secondary metabolites with antidiabetic activities for cancer therapy.
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Affiliation(s)
- Agustina Dwi Retno Nurcahyanti
- Department of Pharmacy, School of Medicine and Health Sciences, Atma Jaya Catholic University of Indonesia, Pluit Raya 2, 14440 Jakarta, Indonesia.
| | - Adeline Jap
- Department of Pharmacy, School of Medicine and Health Sciences, Atma Jaya Catholic University of Indonesia, Pluit Raya 2, 14440 Jakarta, Indonesia
| | - Jullietta Lady
- Department of Pharmacy, School of Medicine and Health Sciences, Atma Jaya Catholic University of Indonesia, Pluit Raya 2, 14440 Jakarta, Indonesia
| | - Deka Prismawan
- Department of Pharmacy, School of Medicine and Health Sciences, Atma Jaya Catholic University of Indonesia, Pluit Raya 2, 14440 Jakarta, Indonesia
| | - Farukh Sharopov
- Chinese-Tajik Innovation Center for Natural Products, National Academy of Sciences of Tajikistan, Ayni str. 299/2, 734063, Dushanbe, Tajikistan
| | - Rachid Daoud
- African Genome Center, Mohammed VI Polytechnic University (UM6P), Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
| | - Michael Wink
- Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, Im Neuenheimer Feld 364, 69120 Heidelberg, Germany
| | - Mansour Sobeh
- AgroBiosciences Research, Mohammed VI Polytechnic University, Lot 660-Hay Moulay Rachid, 43150 Ben-Guerir, Morocco.
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4
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Man N, Li Y, Jie J, Li H, Yang H, Zhao Y, Fu H. Synthesis of Chiral Propargylamines, Chiral 1,2-Dihydronaphtho[2,1-b]furans and Naphtho[2,1-b]furans with C-Alkynyl N,N'-di-(tert-butoxycarbonyl)-aminals and β-Naphthols. Chemistry 2021; 27:12884-12889. [PMID: 34133047 DOI: 10.1002/chem.202102040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Indexed: 12/21/2022]
Abstract
Chiral phosphoric acid-catalyzed couplings of C-alkynyl N,N'-di-(tert-butoxycarbonyl)-aminals with β-naphthols led to chiral propargylamines in moderate to high yields with high to excellent enantioselectivity, in which the reactions underwent sequential chiral phosphoric acid-catalyzed in situ formation of N-(tert-butoxycarbonyl)-imines (N-Boc-imines) from the aminals, and 1,2-addition of β-naphthols to the N-Boc-imines. Chiral 1,2-dihydronaphtho[2,1-b]furans and naphtho[2,1-b]furans were prepared with satisfactory results when 10 mol% AgOAc and 20 mol% 2,6-lutidine or 1.2 equiv. of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) were added to the resulting chiral propargylamines solution, respectively.
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Affiliation(s)
- Ningning Man
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Yuming Li
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Jiyang Jie
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Hongyun Li
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Haijun Yang
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Yufen Zhao
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Hua Fu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, China
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Huang YP, Zhao YY, Johnson OO, Zhang J, Zhao M, Che CT, Yin ZQ. Further prenylated anthranoids from Harungana madagascariensis. PHYTOCHEMISTRY 2021; 186:112711. [PMID: 33711738 DOI: 10.1016/j.phytochem.2021.112711] [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: 10/26/2020] [Revised: 02/17/2021] [Accepted: 02/18/2021] [Indexed: 06/12/2023]
Abstract
Ten undescribed anthranoids, including three anthraquinone acetals as racemic mixtures, (±)-kenganthranol G-I, and seven prenylated anthranols, (±)-kenganthranol J-M and harunganol G-I, together with thirteen known compounds, were isolated from the stem bark of Harungana madagascariensis. The structures of (±)-kenganthranol G and (±)-kenganthranol J were confirmed by X-ray crystallography. (±)-Kenganthranol G was separated into (+)-kenganthranol G and (-)-kenganthranol G by chiral HPLC and their absolute configurations were established by electronic circular dichroism. (±)-Kenganthranol L displayed α-glucosidase inhibitory activity with an IC50 of 4.4 μM.
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Affiliation(s)
- Ya-Ping Huang
- Department of TCMs Pharmaceuticals and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, 210009, People's Republic of China
| | - Yuan-Yu Zhao
- Department of TCMs Pharmaceuticals and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, 210009, People's Republic of China; Laboratory of Translational Medicine, Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, 210028, People's Republic of China
| | - Oluwatosin O Johnson
- Department of Pharmaceutical Chemistry, University of Lagos, CMUL Campus, Lagos, 100254, Nigeria; Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago, Chicago, Illinois, 60612, United States
| | - Jian Zhang
- Laboratory of Translational Medicine, Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, 210028, People's Republic of China
| | - Ming Zhao
- Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago, Chicago, Illinois, 60612, United States; Traditional Chinese Medicine Resources Industrialization Process Collaborative Innovation Center, Nanjing University of Chinese Medicine, Nanjing, 210023, People's Republic of China
| | - Chun-Tao Che
- Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago, Chicago, Illinois, 60612, United States
| | - Zhi-Qi Yin
- Department of TCMs Pharmaceuticals and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, 210009, People's Republic of China.
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Parts, Period, and Extraction Solvents as Parameters Influencing Harungana madagascariensis Lam. ex Poir. (Hypericaceae) Antibacterial Activity. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2021; 2021:6615596. [PMID: 33777157 PMCID: PMC7972859 DOI: 10.1155/2021/6615596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 02/17/2021] [Accepted: 02/21/2021] [Indexed: 11/17/2022]
Abstract
The study of the conditions which affect the pharmacological activity of medicinal plants is the basis for the development of phytomedicine. This study aimed at identifying some optimal conditions for antibacterial activity of extracts of Harungana madagascariensis. The leaves, bark, and roots were harvested in Douala, Littoral Region of Cameroon, in August 2019 at three times of the day: early in the morning (6 a.m.), at midday (12 p.m.), and in the afternoon (6 p.m.). They were dried at room temperature and ground to give a fine powder. Each powder was macerated in methanol for 72 h and boiled in distilled water and palm wine. The obtained extracts were evaluated for their antibacterial activity by broth microdilution method on 31 clinical and 4 reference bacterial strains. The results show that the best extraction yield was obtained using the bark extracted from palm wine by decoction. The methanol bark extract was found to be more active than other solvents (8 and 512 µg/mL). In fact, the activity of the 6 a.m. extract was significant on 4 of the 35 strains tested (MIC< 100 µg/mL) and moderate on 27 of the 35 strains tested (100≤ MIC≤ 625 μg/mL). The activity of the noon extract was significant on 8 strains and moderate on 23 strains and, finally, the activity of the extract of 6 p.m. was significant on 9 strains and moderate on 25 strains. The extract harvested at 6 p.m. inhibited the growth of the 35 strains tested and revealed significant activity (MIC <100 μg/mL) on Staphylococcus aureus, Escherichia coli, Citrobacter freundii, Serratia marcescens, Salmonella enterica serovar typhi, and Yersinia enterocolitica, making this hour the best harvesting time. This study further confirms that the bark of H. madagascariensis is a potent antibacterial agent, being better still when harvested at 6 p.m. and extracted with methanol.
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Isolation and in silico prediction of potential drug-like compounds from Anethum sowa L. root extracts targeted towards cancer therapy. Comput Biol Chem 2019; 78:242-259. [DOI: 10.1016/j.compbiolchem.2018.11.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 10/22/2018] [Accepted: 11/28/2018] [Indexed: 12/16/2022]
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Santos CMM, Freitas M, Fernandes E. A comprehensive review on xanthone derivatives as α-glucosidase inhibitors. Eur J Med Chem 2018; 157:1460-1479. [PMID: 30282319 DOI: 10.1016/j.ejmech.2018.07.073] [Citation(s) in RCA: 108] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/20/2018] [Accepted: 07/30/2018] [Indexed: 12/30/2022]
Abstract
α-Glucosidase plays an important role in carbohydrate metabolism and is therefore an attractive therapeutic target for the treatment of diabetes, obesity and other related complications. In the last two decades, considerable interest has been given to natural and synthetic xanthone derivatives in this field of research. Herein, a comprehensive review of the literature on xanthones as inhibitors of α-glucosidase activity, their mechanism of action, experimental procedures and structure-activity relationships have been reviewed for more than 280 analogs. With this overview we intend to motivate and challenge researchers (e.g. chemistry, biology, pharmaceutical and medicinal areas) for the design of novel xanthones as multipotent drugs and exploit the properties of this class of compounds in the management of diabetic complications.
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Affiliation(s)
- Clementina M M Santos
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253, Bragança, Portugal; Department of Chemistry, QOPNA &University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal.
| | - Marisa Freitas
- LAQV, REQUIMTE, Laboratory of Applied Chemistry, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313, Porto, Portugal
| | - Eduarda Fernandes
- LAQV, REQUIMTE, Laboratory of Applied Chemistry, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313, Porto, Portugal.
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Ochwang'i DO, Kimwele CN, Oduma JA, Gathumbi PK, Kiama SG, Efferth T. Cytotoxic activity of medicinal plants of the Kakamega County (Kenya) against drug-sensitive and multidrug-resistant cancer cells. JOURNAL OF ETHNOPHARMACOLOGY 2018; 215:233-240. [PMID: 29309859 DOI: 10.1016/j.jep.2018.01.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 12/16/2017] [Accepted: 01/04/2018] [Indexed: 06/07/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The geographical location of Kakamega County proximal to the Kakamega Rain Forest in Kenya and its rich flora represents an interesting resource of traditional medicinal plants. The medicinal plants in the present study are traditionally used to treat cancer in Kakamega County as recorded in published literature. AIM OF THE STUDY Due to multidrug resistance (MDR) and severe side effects of currently used drugs in clinical oncology, new candidate compounds are urgently required to improve treatment outcome. The present study explored the in vitro cytotoxic potential of 34 organic and 19 aqueous extracts of Kakamega medicinal plants towards sensitive and multidrug-resistant cancer cell lines. METHODS AND RESULTS The cytotoxicity was determined using the resazurin assay. Eight organic and two aqueous plant extracts inhibited the growth of CCRF-CEM leukemia cells by more than 50%. The organic extracts were Harungana madagascariensis Lam. ex poir (6.6% of untreated control), Prunus africana (Hook.f.) Kalkman (19.4%), Entada abyssinica Steud. ex A. Rich (38.6%), Phyllanthus fischeri Pax (40.7%), Shirakiopsis elliptica (Hochst.) Esser Synonym: Sapium ellipticum (Hochst. kraus) Pax (41.8%), Bridelia micrantha (Hochst.) Baill (45.4%) and Futumia africana Benth. (45.8%) and Microglossa pyrifolia (Lam.) Kuntze (48%). The aqueous extracts were Bridelia micrantha (Hochst.) Baill (31.3%) and Shirakiopsis elliptica (Hochst.) Esser Synonym: Sapium ellipticum (Hochst. Kraus) Pax (48.2%). In addition to P-glycoprotein-expressing tumor cells, we also investigated other mechanisms of drug resistance, i.e. BCRP- or EGFR-transfected and TP53-knockout tumor cells. Some extracts also showed considerable cytotoxic activity against these drug-resistant cell lines. As demonstrated for selected examples, some extracts exhibited enhanced cytotoxicity towards cancer cells, if applied in combination with other extracts. DISCUSSION The panel of medicinal plants used in the Kakamega County for cancer treatment revealed indeed cytotoxicity to various extent towards cancer cells in vitro. Hence, our results may at least in part substantiate the traditional use of these compounds to treat cancer. Even more interesting, several extracts inhibited otherwise drug-resistant tumor cell lines with similar or even better efficacy than their drug-sensitive counterparts. This provides an attractive perspective for further exploration of their anticancer potential to combat drug resistance of refractory tumors.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- ATP Binding Cassette Transporter, Subfamily G, Member 2/genetics
- ATP Binding Cassette Transporter, Subfamily G, Member 2/metabolism
- Antineoplastic Agents, Phytogenic/chemistry
- Antineoplastic Agents, Phytogenic/pharmacology
- Cell Line, Tumor
- Cell Survival/drug effects
- Drug Resistance, Neoplasm
- Drug Therapy, Combination
- ErbB Receptors/genetics
- ErbB Receptors/metabolism
- Gene Expression Regulation, Neoplastic/drug effects
- Humans
- Inhibitory Concentration 50
- Medicine, African Traditional
- Neoplasm Proteins/genetics
- Neoplasm Proteins/metabolism
- Oxazines/metabolism
- Plants, Medicinal/chemistry
- Xanthenes/metabolism
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Affiliation(s)
- Dominic O Ochwang'i
- Department of Veterinary Anatomy and Physiology, University of Nairobi, P.O. Box 30197, Nairobi 00100, Kenya.
| | - Charles N Kimwele
- Department of Veterinary Anatomy and Physiology, University of Nairobi, P.O. Box 30197, Nairobi 00100, Kenya.
| | - Jemimah A Oduma
- Department of Veterinary Anatomy and Physiology, University of Nairobi, P.O. Box 30197, Nairobi 00100, Kenya.
| | - Peter K Gathumbi
- Department of Veterinary Pathology, Parasitology and Microbiology, University of Nairobi, P.O. BOX 30197-00100, Nairobi, Kenya.
| | - Stephen G Kiama
- College of Agriculture and Veterinary Sciences, P.O. Box 30197, Nairobi 00100, Kenya.
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, Johannes Gutenberg University, Staudinger Weg 5, 55128 Mainz, Germany.
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Ali W, Dahiya A, Patel BK. Cascade Synthesis of Dihydrobenzofurans and Aurones via
Palladium-Catalyzed Isocyanides Insertion into 2-Halophenoxy Acrylates. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Wajid Ali
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781 039, Assam India, Fax: (+91)361-26909762
| | - Anjali Dahiya
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781 039, Assam India, Fax: (+91)361-26909762
| | - Bhisma K. Patel
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781 039, Assam India, Fax: (+91)361-26909762
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12
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Synthesis, in vitro evaluation and molecular docking studies of novel amide linked triazolyl glycoconjugates as new inhibitors of α-glucosidase. Bioorg Chem 2017; 72:11-20. [DOI: 10.1016/j.bioorg.2017.03.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 02/08/2017] [Accepted: 03/17/2017] [Indexed: 11/22/2022]
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Siddiqui H, Bashir MA, Javaid K, Nizamani A, Bano H, Yousuf S, Rahman AU, Choudhary MI. Ultrasonic synthesis of tyramine derivatives as novel inhibitors of α-glucosidase in vitro. J Enzyme Inhib Med Chem 2016; 31:1392-403. [PMID: 26912275 DOI: 10.3109/14756366.2016.1142983] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Tyramine derivatives 3-27 were synthesized by using conventional and environmental friendly ultrasonic techniques. These derivatives were then evaluated for the first time for their α-glucosidase (Sources: Saccharomyces cerevisiae and mammalian rat-intestinal acetone powder) inhibitory activity by using in vitro mechanism-based biochemical assays. Compounds 7, 14, 20, 21 and 26 were found to be more active (IC50 = 49.7 ± 0.4, 318.8 ± 3.7, 23.5 ± 0.9, 302.0 ± 7.3 and 230.7 ± 4.0 μM, respectively) than the standard drug, acarbose (IC50 = 840.0 ± 1.73 μM (observed) and 780 ± 0.028 μM (reported)) against α-glucosidase obtained from Saccharomyces cerevisiae. Kinetic studies were carried out on the most active members of the series in order to determine their mode of inhibition and dissociation constants. Compounds 7, 20 and 26 were found to be the competitive inhibitors of α-glucosidase. These compounds were also screened for their protein antiglycation, and dipeptidyl peptidase-IV (DPP-IV) inhibitory activities. Only compounds 20, 22 and 27 showed weak antiglycation activity with IC50 values 505.27 ± 5.95, 581.87 ± 5.50 and 440.58 ± 2.74 μM, respectively. All the compounds were found to be inactive against DDP-IV enzyme. Inhibition of α-glucosidase, DPP-IV enzymes and glycation of proteins are valid targets for the discovery of antidiabetic drugs. Cytotoxicity of compounds 3-27 was also evaluated by using mouse fibroblast 3T3 cell lines. All the compounds were found to be noncytotoxic. The current study describes the synthesis α-glucosidase inhibitory activity of derivatives, based on a natural product tyramine template. The compounds reported here may serve as the starting point for the design and development of novel α-glucosidase inhibitors as antidiabetic agents.
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Affiliation(s)
- Hina Siddiqui
- a H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi , Karachi-75270 , Pakistan and
| | - Muhammad Arslan Bashir
- a H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi , Karachi-75270 , Pakistan and
| | - Kulsoom Javaid
- a H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi , Karachi-75270 , Pakistan and
| | - Arsalan Nizamani
- a H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi , Karachi-75270 , Pakistan and
| | - Huma Bano
- a H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi , Karachi-75270 , Pakistan and
| | - Sammer Yousuf
- a H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi , Karachi-75270 , Pakistan and
| | - Atta-Ur Rahman
- a H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi , Karachi-75270 , Pakistan and
| | - M Iqbal Choudhary
- a H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi , Karachi-75270 , Pakistan and.,b Department of Biochemistry , King Abdul Aziz University , Jeddah-21452 , Saudi Arabia
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Agnaniet H, Mbot EJ, Keita O, Fehrentz JA, Ankli A, Gallud A, Garcia M, Gary-Bobo M, Lebibi J, Cresteil T, Menut C. Antidiabetic potential of two medicinal plants used in Gabonese folk medicine. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2016; 16:71. [PMID: 26906899 PMCID: PMC4763413 DOI: 10.1186/s12906-016-1052-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 02/16/2016] [Indexed: 01/02/2023]
Abstract
BACKGROUND Diabetes mellitus is a metabolic disorder which is rising globally in rich and developing countries. In the African region this rate is the highest, with 20 million diagnosed diabetics. Despite a noticeable progress in the treatment of diabetes mellitus by synthetic drugs, the search for new natural anti-diabetic agents is going on. Nauclea diderrichii (De Wild.) Merr. (ND) and Sarcocephalus pobeguinii Hua ex Pellegr. (SP) are used as traditional medicines in Gabon for the treatment of different diseases, especially in the case of diabetes. The aim of this study was to evaluate the antidiabetic potential of these two medicinal plants traditionally used in Gabon. METHODS Pharmacological (inhibitory action on α and β-glucosidases) and toxicological (effect on human T cell proliferation) studies were conducted on aqueous extracts of ND (leaves and bark) and SP (bark) collected in Gabon. All raw extracts were analyzed by HPTLC and their content in phenolic compounds was determined by using standard method. The most active extracts were submitted to preparative HPLC in order to evidence the most efficient subfractions by biological evaluation. RESULTS The results showed that two extracts from ND were potent α-glucosidase inhibitors, the leaf extract being more active that the bark extract: the first one was more than 60 fold more active than Acarbose, which is an oral medication used to treat type 2 diabetes; the extract from SP bark was less efficient. The HPLC subfractions of the extracts of ND leaves and SP bark were tested in the same experimental conditions. In each case, the most active subfractions still show very potent inhibitory effect on α-glucosidase (80-90% inhibition at 0.1 mg/mL). The most efficient extract, from ND leaves, was also characterized by the highest percentage of phenolic compounds, which suggests a relationship between its inhibitory potential on α-glucosidase and its content in phenolic compounds. Conversely, only a moderate inhibitory activity of the three extracts was observed on β-glucosidase. CONCLUSION These results clearly indicated that active compounds present in N. diderrichii and S. pobeguinii leaves or/and bark were selective and highly potent inhibitors of α-glucosidase and validate their popular use for the treatment of diabetes.
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Affiliation(s)
- Huguette Agnaniet
- />Laboratoire de Substances Naturelles et de Synthèses Organométalliques (LASNSOM), Université des Sciences et Techniques de Masuku, Faculté des Sciences B.P. 943, Franceville, Gabon
| | - Elvis Jolinom Mbot
- />Laboratoire de Substances Naturelles et de Synthèses Organométalliques (LASNSOM), Université des Sciences et Techniques de Masuku, Faculté des Sciences B.P. 943, Franceville, Gabon
| | - Ousmane Keita
- />Institut des Sciences Appliquées (ISA)-Département de Génie Biologique (GB)-Biochimie-Université des Sciences, des Techniques et des Technologies de Bamako (USTTB) BPE, 423 Bamako - Hamdallaye ACI 2000 - Rue : 405, Porte, 359 Mali
| | - Jean-Alain Fehrentz
- />Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier-ENSCM, Bâtiment E, Faculté de Pharmacie, 15, avenue Charles Flahault BP14491, 34093 Montpellier, cedex 5 France
| | - Anita Ankli
- />CAMAG Laboratory, Sonnenmattstrasse 11, 4132 Muttenz, Switzerland
| | - Audrey Gallud
- />Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier-ENSCM, Bâtiment E, Faculté de Pharmacie, 15, avenue Charles Flahault BP14491, 34093 Montpellier, cedex 5 France
| | - Marcel Garcia
- />Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier-ENSCM, Bâtiment E, Faculté de Pharmacie, 15, avenue Charles Flahault BP14491, 34093 Montpellier, cedex 5 France
| | - Magali Gary-Bobo
- />Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier-ENSCM, Bâtiment E, Faculté de Pharmacie, 15, avenue Charles Flahault BP14491, 34093 Montpellier, cedex 5 France
| | - Jacques Lebibi
- />Laboratoire de Substances Naturelles et de Synthèses Organométalliques (LASNSOM), Université des Sciences et Techniques de Masuku, Faculté des Sciences B.P. 943, Franceville, Gabon
| | - Thierry Cresteil
- />CIBLOT, IPSIT - IFR141, 5 rue Jean Baptiste Clément, 92290 Chatenay-Malabry, France
| | - Chantal Menut
- />Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier-ENSCM, Bâtiment E, Faculté de Pharmacie, 15, avenue Charles Flahault BP14491, 34093 Montpellier, cedex 5 France
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Johnson OO, Zhao M, Gunn J, Santarsiero BD, Yin ZQ, Ayoola GA, Coker HAB, Che CT. α-Glucosidase Inhibitory Prenylated Anthranols from Harungana madagascariensis. JOURNAL OF NATURAL PRODUCTS 2016; 79:224-229. [PMID: 26727375 DOI: 10.1021/acs.jnatprod.5b00924] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Four new prenylated anthranols, harunganols C-F (1-4), along with kenganthranol A (5), harunganin (6), and ferruginin A (7), were identified from the leaves of Harungana madagascariensis. The structures of compounds 2, 5, and 7 were confirmed by single-crystal X-ray diffraction analysis. Compound 1 is a unique symmetrical anthranol dimer connected via a CH2 group. Compound 4 possesses a unique C-10 hemiketal group. All anthranols were evaluated for their α-glucosidase inhibitory activities. They displayed a higher potency compared to acarbose except for 3 and 4. In particular, harunganol C (1) showed an IC50 value of 1.2 μM.
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Affiliation(s)
- Oluwatosin O Johnson
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , Chicago, Illinois 60612, United States
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos , CMUL Campus, Lagos 100254, Nigeria
| | - Ming Zhao
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , Chicago, Illinois 60612, United States
| | - Jordan Gunn
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , Chicago, Illinois 60612, United States
| | - Bernard D Santarsiero
- Center for Pharmaceutical Biotechnology and Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago , Chicago, Illinois 60607, United States
| | - Zhi-Qi Yin
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , Chicago, Illinois 60612, United States
- Department of Natural Medicinal Chemistry & State Key Laboratory of Natural Medicines, China Pharmaceutical University , Nanjing 210009, People's Republic of China
| | - Gloria A Ayoola
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos , CMUL Campus, Lagos 100254, Nigeria
| | - H A B Coker
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos , CMUL Campus, Lagos 100254, Nigeria
| | - Chun-Tao Che
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , Chicago, Illinois 60612, United States
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Onajobi IB, Adhikari A, Hussain S, Javaid K, Fagade OE, Oladosu IA. New α-glucosidase inhibiting anthracenone from the barks of Harungana madagascariensis Lam. Nat Prod Res 2015; 30:2507-2513. [PMID: 26621758 DOI: 10.1080/14786419.2015.1115998] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Two new 10-hydroxy-9(10H)-anthracenone, madagascenone A (1) and B (2), were isolated from the barks of Harungana madagascariensis Lam. The structures of the compounds were determined using 1D- and 2D-NMR and mass spectroscopic techniques. Both of the compounds showed an in vitro α-glucosidase inhibition with IC50 = 69.9 ± 4.21 and 122.3 ± 1.13 μM, respectively, more potent than the standard acarbose (IC50 = 840 ± 1.23 μM).
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Affiliation(s)
- Ismail B Onajobi
- a Department of Microbiology , Olabisi Onabanjo University , Ago-Iwoye , Nigeria.,b H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences , University of Karachi , Karachi , Pakistan
| | - Achyut Adhikari
- b H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences , University of Karachi , Karachi , Pakistan
| | - Shabbir Hussain
- b H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences , University of Karachi , Karachi , Pakistan
| | - Kulsoom Javaid
- b H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences , University of Karachi , Karachi , Pakistan
| | - Obasola E Fagade
- c Environmental and Biotechnology Unit, Department of Microbiology , University of Ibadan , Ibadan , Nigeria
| | - I A Oladosu
- d Department of Chemistry , University of Ibadan , Ibadan , Nigeria
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Ghani U. Re-exploring promising α-glucosidase inhibitors for potential development into oral anti-diabetic drugs: Finding needle in the haystack. Eur J Med Chem 2015; 103:133-62. [PMID: 26344912 DOI: 10.1016/j.ejmech.2015.08.043] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 08/16/2015] [Accepted: 08/23/2015] [Indexed: 01/27/2023]
Abstract
Treatment of diabetes mellitus by oral α-glucosidase inhibitors is currently confined to acarbose, miglitol and voglibose marred by efficacy problems and unwanted side effects. Since the discovery of the drugs more than three decades ago, no significant progress has been made in the drug development area of anti-diabetic α-glucosidase inhibitors. Despite existence of a wide chemical diversity of α-glucosidase inhibitors identified to date, majority of them are simply piled up in publications and reports thus creating a haystack destined to be forgotten in the scientific literature without given consideration for further development into drugs. This review finds those "needles" in that haystack and lays groundwork for highlighting promising α-glucosidase inhibitors from the literature that may potentially become suitable candidates for pre-clinical or clinical trials while drawing attention of the drug development community to consider and take already-identified promising α-glucosidase inhibitors into the next stage of drug development.
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Affiliation(s)
- Usman Ghani
- Clinical Chemistry Unit, Department of Pathology, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia.
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Antia BS, Ita BN, Udo UE. Nutrient Composition and In Vitro Antioxidant Properties of Harungana madagascariensis Stembark Extracts. J Med Food 2015; 18:609-14. [PMID: 25785542 PMCID: PMC4410548 DOI: 10.1089/jmf.2014.0084] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 01/20/2015] [Indexed: 11/13/2022] Open
Abstract
The stembarks of Harungana madagascariensis were analyzed for their content of chemical constituents, antinutrients, vitamin levels, and in vitro antioxidant properties in two solvent systems. Phytochemical screening revealed higher levels of alkaloids, saponins, and flavonoids in the methanolic (MHM) extract than in the dichloromethane (DCM) extract. The methanolic extract had higher contents of minerals, vitamins, and antinutrients except K, vitamin B1, and phytic acid, respectively. Antioxidant potentials of the stembark extracts were assessed by the 1, 1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity, metal chelating activity, and ferric reducing power. The methanolic extract showed a better antioxidant activity (IC50=87.66±0.97 μg/mL) in the DPPH system. The metal chelating activity was higher in the methanolic extract (92.4% at 20 mg/mL), but lower than the control ethylenediaminetetraacetic acid (EDTA). The methanolic extract also showed greater ferric reducing power and was richer in phenolics (132.24±0.61 mgGAE/g) and flavonoids (259.05±2.85 mgQE/g). Antinutrient analysis of the extracts indicated low levels of phytic acid, oxalates, and hydrocyanides below the lethal doses. The LD50 (i.p. mice) of the extracts showed relatively low toxicity in the range 1000-1414 mg/kg. These results support the ethnomedicinal uses of this plant in the treatment of diseases related to oxidative stress and suggest that consumption of H. madagascariensis is not harmful nutritively.
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Wang SM, Han JJ, Ma K, Jin T, Bao L, Pei YF, Liu HW. New α-glucosidase inhibitors with p-terphenyl skeleton from the mushroom Hydnellum concrescens. Fitoterapia 2014; 98:149-55. [PMID: 25088970 DOI: 10.1016/j.fitote.2014.07.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 07/22/2014] [Accepted: 07/23/2014] [Indexed: 02/03/2023]
Abstract
The purpose of this study is to elucidate the bioactive components responsible for the the α-glucosidase inhibitory activity detected in the EtOAc extract of the mushroom Hydnellum concrescens. Two new p-terphenyl derivatives, concrescenins A (1) and B (2), in along with six known compounds thelephantins L (3), I (4), J (5), K (6), dihydroauran-tiacin dibenzoate (7), and curtisian A (8) were isolated from the fruiting bodies of H. concrescens. Their chemical structures were elucidated by NMR experiments. Compounds 1-4 and 6-8 showed the inhibitory activity against α-glucosidase with the IC50 of 0.99, 3.11, 4.53, 18.77, 2.98, 5.16, and 8.34 μM, respectively. Kinetic analysis of α-glucosidase indicated that compounds 1 and 2 inhibited the activity of α-glucosidase in a noncompetitive fashion with a Ki value of 0.02 and 0.21 μM, respectively. In antioxidant evaluation, compounds 1 and 4 showed weak DPPH scavenging activity (EC50=82.50 and 161.75 μM) and weak reducing ability (EC50=193.57 and 152.94 μM). The current research supports the potential use of mushroom-derived p-terphenyl derivatives for the treatment of diabetes.
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Affiliation(s)
- Shi-Mei Wang
- Laboratory of Microbiology, College of Life Science, Heilongjiang University, Harbin 150080, People's Republic of China; State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichenxi Road, Chaoyang District, Beijing 100101, People's Republic of China
| | - Jun-Jie Han
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichenxi Road, Chaoyang District, Beijing 100101, People's Republic of China
| | - Ke Ma
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichenxi Road, Chaoyang District, Beijing 100101, People's Republic of China
| | - Tao Jin
- Laboratory of Microbiology, College of Life Science, Heilongjiang University, Harbin 150080, People's Republic of China.
| | - Li Bao
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichenxi Road, Chaoyang District, Beijing 100101, People's Republic of China
| | - Yun-Fei Pei
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichenxi Road, Chaoyang District, Beijing 100101, People's Republic of China
| | - Hong-Wei Liu
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichenxi Road, Chaoyang District, Beijing 100101, People's Republic of China.
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Liu Y, Ma L, Chen WH, Park H, Ke Z, Wang B. Binding Mechanism and Synergetic Effects of Xanthone Derivatives as Noncompetitive α-Glucosidase Inhibitors: A Theoretical and Experimental Study. J Phys Chem B 2013; 117:13464-71. [DOI: 10.1021/jp4067235] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yan Liu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry/KLGHEI of Environment and Energy Chemistry, School of Chemistry & Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China
| | - Lin Ma
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry/KLGHEI of Environment and Energy Chemistry, School of Chemistry & Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China
| | - Wen-Hua Chen
- School
of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, PR China
| | - Hwangseo Park
- Department
of Bioscience and Biotechnology, Sejong University, 98 Kunja-Dong, Kwangjin-Ku, Seoul 143-747, Korea
| | - Zhuofeng Ke
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry/KLGHEI of Environment and Energy Chemistry, School of Chemistry & Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China
| | - Bo Wang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry/KLGHEI of Environment and Energy Chemistry, School of Chemistry & Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China
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Tiani GM, Ahmed I, Krohn K, Green IR, Nkengfack AE. Kenganthranol F, a new Anthranol from Psorospermum aurantiacum. Nat Prod Commun 2013. [DOI: 10.1177/1934578x1300800123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A new anthranol, kenganthranol F, was isolated from the ethyl acetate extracts of the seeds and the whole plant of the Cameroonian plant Psorospermum aurantiacum (Hypericaceae), together with fifteen known compounds viz., ferruginin B, vismin, vismion D, haronginanthrone, kenganthraquinone, kenganthranol B and kenganthranol E isolated from the fruits and 3-geranyloxyemodinanthrone, 2-geranylemodin, bianthrone A1, vismione D, 1,8-dihydroxy- 3-geranyloxy-6-methylanthraquinone, vismione M, vismiaquinone, vismiaquinone C being isolated from the whole plant. The structure of the new isomer of kenganthranol F was determined to be 1,8,10-trihydroxy-3,4-[2,2-dimethyldihydropyrano]-6-methyl-2,5-bis-(3,3-dimethylallyl)-anthrone.
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Affiliation(s)
- Gesquiere M. Tiani
- Department of Organic Chemistry, Faculty of Science, University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon
| | - Ishtiaq Ahmed
- Department of Chemistry, University of Paderborn, Warburger Stra βe 100, D-33098 Paderborn, Germany
| | - Karsten Krohn
- Department of Chemistry, University of Paderborn, Warburger Stra βe 100, D-33098 Paderborn, Germany
| | - Ivan R. Green
- Department of Chemistry, University of Stellenbosch, P/Bag X1, Matieland, 7602, South Africa
| | - Augustin E. Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon
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Christensen J, Albrecht Ł, Jørgensen KA. Stereocontrolled Organocatalytic Strategy for the Synthesis of Optically Active 2,3-Disubstitutedcis-2,3-Dihydrobenzofurans. Chem Asian J 2012; 8:648-52. [DOI: 10.1002/asia.201201072] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Indexed: 12/27/2022]
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Tchakam PD, Lunga PK, Kowa TK, Lonfouo AHN, Wabo HK, Tapondjou LA, Tane P, Kuiate JR. Antimicrobial and antioxidant activities of the extracts and compounds from the leaves of Psorospermum aurantiacum Engl. and Hypericum lanceolatum Lam. Altern Ther Health Med 2012; 12:136. [PMID: 22916964 PMCID: PMC3576290 DOI: 10.1186/1472-6882-12-136] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Accepted: 08/14/2012] [Indexed: 11/13/2022]
Abstract
Background Psorospermun aurantiacum and Hypericum lanceolatum are plants locally used in Cameroon and other parts of Africa for the treatment of gastrointestinal and urinary tract infections, skin infections, venereal diseases, gastrointestinal disorder, infertility, epilepsy as well as microbial infections. The present study was designed in order to investigate the in vitro antimicrobial and radical scavenging activities of the extracts and isolated compounds from the leaves of these plants. Methods The plant extract was prepared by maceration in ethyl acetate and methanol and fractionated by column chromatography. The structures of isolated compounds were elucidated by spectroscopic analyses in conjunction with literature data. The broth microdilution method was used to evaluate the in vitro antimicrobial activity against bacteria, yeasts and dermatophytes. The antioxidant potentials of the extracts and their isolated compounds were evaluated using the DPPH radical scavenging method. Results Five known compounds: physcion (1), 1,8-dihydroxy-3-geranyloxy-6-methylanthraquinone (2), kenganthranol B (3), vismiaquinone (4), and octacosanol (5) were isolated from the leaves of P. aurantiacum while six compounds including friedelin (6), betulinic acid (7), 2,2’,5,6’-tetrahydroxybenzophenone (8), allanxanthone A (9), 1,3,6- trihydroxyxanthone (10) and isogarcinol (11) were isolated from H. lanceolatum. Compound 8 and 4 exhibited the highest antibacterial and antifungal activities with MIC ranges of 2–8 μg/ml and 4–32 μg/ml respectively. P. aurantiacum crude extract (Rsa50 = 6.359 ± 0.101) showed greater radical scavenging activity compared with H. lanceolatum extract (Rsa50 = 30.996 ± 0.879). Compound 11 showed the highest radical scavenging activity (RSa50 = 1.012 ± 0.247) among the isolated compounds, comparable to that of L-arscobic acid (RSa50 = 0.0809 ± 0.045). Conclusions The experimental findings show that the ethyl acetate and methanol extracts and isolated compounds from P. aurantiacum and H. lanceolatum stem bark possess significant antimicrobial and antioxidant activities justifying the use of these plants in traditional medicine, which may be developed as phytomedicines.
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Genovese S, Epifano F, Curini M, Kremer D, Carlucci G, Locatelli M. Screening for oxyprenylated anthraquinones in Mediterranean Rhamnus species. BIOCHEM SYST ECOL 2012. [DOI: 10.1016/j.bse.2012.03.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
This article gives an overview of synthetic approaches to the 2,3-dihydrobenzofuran ring system with an emphasis on recently developed methods. The synthetic approaches are classified according to the key bond(s) formed during the construction of the dihydrobenzofuran skeleton, and approaches of relevance to the synthesis of natural products are highlighted.
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Affiliation(s)
- Tom D. Sheppard
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon St, London WC1H 0AJ, UK
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Jiang H, Sugiyama T, Hamajima A, Hamada Y. Asymmetric Synthesis of 2-Substituted Dihydrobenzofurans and 3-Hydroxydihydrobenzopyrans through the Enantioselective Epoxidation of O-Silyl-Protected ortho-Allylphenols. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000505] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Iwalewa EO, Omisore NO, Adewunmi CO, Gbolade AA, Ademowo OG, Nneji C, Agboola OI, Daniyan OM. Anti-protozoan activities of Harungana madagascariensis stem bark extract on trichomonads and malaria. JOURNAL OF ETHNOPHARMACOLOGY 2008; 117:507-511. [PMID: 18372133 DOI: 10.1016/j.jep.2008.02.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2007] [Revised: 01/24/2008] [Accepted: 02/14/2008] [Indexed: 05/26/2023]
Abstract
AIM OF THE STUDY The ethanolic stem bark extract of Harungana madagascariensis (Hypericaceae), (Choisy) Poir were evaluated for their activities on Trichomonas gallinae (Rivolta) Stabler isolated from the pigeon (Columba livia). It was also tested for their anti-malarial activity on N67 Plasmodium yoelii nigeriensis (in vivo) in mice and on Plasmodium falciparum isolates in vitro. MATERIALS AND METHODS The anti-trichomonal screening was performed in vitro using Trichomonas gallinae culture. The minimum lethal concentration (MLC) is the lowest concentration of the test extract in which no motile organisms were observed. The anti-malarial effects were determined in-vivo for suppressive, curative and prophylactic activities in mice receiving a standard inoculum size of 1 x 10(7) (0.2 ml) infected erythrocytes of Plasmodium yoelii nigeriensis intraperitoneally, and the in vitro was performed against 3 isolates of Plasmodium falciparum in a candle jar procedures. RESULTS The IC(50) of the extract and metronidazole (MDZ) (Flagyl) on Trichomonas gallinae at 48 h are 187 and 1.56 microg/ml. The IC(50) of the extract, chloroquine (CQ) and artemether (ART) on Plasmodium falciparum are between 0.052 and 0.517 microg/ml for the extract and 0.021 and 0.0412 microg/ml for ART and CQ, respectively. The actions of the extract in in vivo study on Plasmodium yoelii nigeriensis showed that in both suppressive and prophylactic tests the percentages chemo-suppressive were between 28.6-44.8% and 30.2-78.2% respectively, while only 80 mg/kg of the extract reduced the parasitaemia level when compared to the control and the standard drugs in curative test. CONCLUSIONS Harungana madagascariensis stem bark extract therefore exhibited significant anti-protozoan effects against Trichomonas and Plasmodium both in vivo and in vitro.
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Affiliation(s)
- E O Iwalewa
- Department of Pharmacology, Faculty of Pharmacy, Obafemi Awolowo University, Ile-Ife, Nigeria.
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Hou XL, Yang Z, Yeung KS, Wong HN. Chapter 5.3 Five-membered ring systems: furans and benzofurans. PROGRESS IN HETEROCYCLIC CHEMISTRY 2008. [DOI: 10.1016/s0959-6380(08)80009-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Tiabou Tchinda A, Nahar Khan S, Fuendjiep V, Ngandeu F, Ngono Ngane A, Choudhary MI. Alpha-glucosidase inhibitors from Millettia conraui. Chem Pharm Bull (Tokyo) 2007; 55:1402-3. [PMID: 17827772 DOI: 10.1248/cpb.55.1402] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A new geranylated isoflavone, 7-O-geranyl-6-methoxypseudobaptigenin (1) was isolated from the stem barks of Millettia conraui, along with known compounds 5-methoxydurmillone (2), conrauinone A (3), beta-amyrine (4), sitosterol (5), 3-O-beta-D-glucopyranosyl sitosterol (6) and n-docosanol (7). Compounds 1 and 4 showed a significant alpha-glucosidase inhibitory activity. The structures of the compounds were determined by analysis of their spectroscopic data.
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Affiliation(s)
- Alembert Tiabou Tchinda
- Center of Medicinal Plants Studies and Traditional Medicine (CRPMT), Institute of Medical Research and Medicinal Plants Studies (IMPM), Yaaoundé, Cameroon.
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Luo JG, Wang XB, Ma L, Kong LY. Gypsophin: A novel α-glucosidase inhibitory cyclic peptide from the roots of Gypsophila oldhamiana. Bioorg Med Chem Lett 2007; 17:4460-3. [PMID: 17587576 DOI: 10.1016/j.bmcl.2007.06.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2007] [Revised: 05/19/2007] [Accepted: 06/02/2007] [Indexed: 12/01/2022]
Abstract
An unusual new cyclic peptide with a pyrrolidine-2,5-dione unit, gypsophin (1), was isolated from Gypsophila oldhamiana. Its structure was elucidated by the spectroscopic evidences. The stereochemistry was determined by application of the Marfey's method and the single-crystal X-ray diffraction. Compound 1 exhibited inhibitory activity against alpha-glucosidase with IC50 of 305 microM.
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Affiliation(s)
- Jian-Guang Luo
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China
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Salazar MO, Furlan RLE. A rapid TLC autographic method for the detection of glucosidase inhibitors. PHYTOCHEMICAL ANALYSIS : PCA 2007; 18:209-12. [PMID: 17500363 DOI: 10.1002/pca.971] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A new bioautographic assay suitable for the localisation of beta-glucosidase inhibitors present in a complex matrix is described. Enzyme activity was detected using esculin as the substrate to produce esculetin, which reacts with ferric ion to form a brown complex.
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Affiliation(s)
- Mario O Salazar
- Catedra de Farmacognosia, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, S2002LRK Rosario, Argentina
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Kouam SF, Yapna DB, Krohn K, Ngadjui BT, Ngoupayo J, Choudhary MI, Schulz B. Antimicrobial prenylated anthracene derivatives from the leaves of Harungana madagascariensis. JOURNAL OF NATURAL PRODUCTS 2007; 70:600-3. [PMID: 17352491 DOI: 10.1021/np060556l] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Three new prenylated anthranoids, harunmadagascarins C (1) and D (2) and kenganthranol D (3), together with three known compounds (4-6) were isolated from the leaves of Harungana madagascariensis. Their structures were assigned by spectroscopic methods and by comparison with literature data. In the three new natural products 1-3, one or two prenyl groups are incorporated in furan, pyran, or cyclohexane rings in four different modes of annulation. Compounds 2, 4, and 6 were strongly active against the Gram-positive Bacillus megaterium.
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Affiliation(s)
- Simeon F Kouam
- Department of Chemistry, Higher Teachers' Training College, University of Yaounde 1, BP 47, Yaounde, Cameroon.
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Ndjakou Lenta B, Ngouela S, Fekam Boyom F, Tantangmo F, Feuya Tchouya GR, Tsamo E, Gut J, Rosenthal PJ, Donald Connolly J. Anti-plasmodial Activity of Some Constituents of the Root Bark of Harungana madagascariensis LAM. (Hypericaceae). Chem Pharm Bull (Tokyo) 2007; 55:464-7. [PMID: 17329893 DOI: 10.1248/cpb.55.464] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bazouanthrone (1), a new anthrone derivative, has been isolated from the root bark of Harungana madagascariensis, together with known compounds, feruginin A (2), harunganin (3), harunganol A (4), harunganol B (5), friedelan-3-one (6) and betulinic acid (7). The structure of the compound (1) was assigned as 3,5,8,9-tetrahydroxy-2,4,4-tri-(3,3-dimethylallyl)-6-methyl-1-(4H)-anthracenone, by means of spectroscopic analysis. The anti-plasmodial activity of the isolated compounds was evaluated in culture against W2 strain of Plasmodium falciparum. All the compounds were found to be active against the Plasmodium parasites with bazouanthrone (1) showing particular potency (IC50=1.80 microM).
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Affiliation(s)
- Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teachers' Training College, University of Yaoundé 1, Yaoundé, Cameroon
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Wabo HK, Kouam SF, Krohn K, Hussain H, Tala MF, Tane P, Ree TV, Hu Q, Schulz B. Prenylated Anthraquinones and Other Constituents from the Seeds of Vismia laurentii. Chem Pharm Bull (Tokyo) 2007; 55:1640-2. [DOI: 10.1248/cpb.55.1640] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | - Simeon Fogue Kouam
- Department of Chemistry, University of Paderborn
- Department of Chemistry, Higher Teachers' Training College, University of Yaounde 1
| | | | | | | | - Pierre Tane
- Department of Chemistry, University of Dschang
| | | | - Qunxiu Hu
- Institute of Microbiology, Technical University of Braunschweig
| | - Barbara Schulz
- Institute of Microbiology, Technical University of Braunschweig
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