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Liu L, Jia W, Jiang S, Zhang G, Zhao J, Xu J, Wang L, Wu D, Tao J, Yue H, Zhao X. Inhibitory activities and rules of plant gallotannins with different numbers of galloyl moieties on sucrase, maltase and α-amylase in vitro and in vivo. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2023; 120:155063. [PMID: 37716036 DOI: 10.1016/j.phymed.2023.155063] [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: 07/12/2023] [Revised: 08/18/2023] [Accepted: 08/30/2023] [Indexed: 09/18/2023]
Abstract
BACKGROUND α-Glucosidase inhibitors could effectively reduce postprandial blood glucose (PBG) levels and control the occurrence of complications of diabetes. Gallotannins (GTs) in plants have attracted much attention due to their significant α-glucosidase inhibitory activities in vitro. However, there is still a lack of systematic comparative studies to further elucidate inhibitory activities in vivo and in vitro of these compounds against α-glucosidase, especially for mammalian sucrase and maltase, and analyze their structure-activity relationship. PURPOSE Determine the in vitro and in vivo inhibitory activities of five GTs with different number of galloyl moieties (GMs) on sucrase, maltase and α-amylase, and elucidate the relationship between α-glucosidase inhibitory activities and the number and connection mode of GMs. METHODS Molecular docking and dynamics were used to study the binding mode and binding ability of five GTs against sucrase, maltase and α-amylase. Then, the inhibitory activities and inhibitory mechanisms of these compounds on sucrase, maltase and α-amylase in vitro were studied using inhibitory assay and enzyme inhibition kinetics. Further, the hypoglycemic effects in vivo of these compounds were demonstrated by three polysaccharides tolerance experiments on diabetes model mice. RESULTS The results of molecular docking showed that these compounds could bind to enzymes through hydrogen bonds, hydrophobic interactions, etc. In addition, the α-glucosidase inhibition comparative studies in vitro and in vivo demonstrated that the inhibitory activities of these compounds on all three sucrase, maltase and α-amylase were ranked as TA ≈ PGG > TeGG > TGG > 1GG, and their inhibitory activities increases with the increase in the number of GMs. Moreover, the hypoglycemic effects of 1,2,3,4,6-pentagalloylglucose (PGG) and tannic acid (TA) in vitro and in vivo were also confirmed to be equivalent to or even stronger than that of acarbose. CONCLUSION α-Glucosidase inhibitory activities in vitro and in vivo of GTs were positively correlated with the number of GTs, and the more the number, the stronger the activity. However, PGG with five GTs and TA with ten GTs showed almost identical α-glucosidase inhibitory activities, possibly due to the reduced binding force with the enzyme caused by spatial hindrance.
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Affiliation(s)
- Liying Liu
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, CAS and Qinghai Provincial Key Laboratory of Tibetan Medicine Research, 23 Xinning Road, Xining, Qinghai 810008, China; University of Chinese Academy of Sciences, China
| | - Wenjing Jia
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, CAS and Qinghai Provincial Key Laboratory of Tibetan Medicine Research, 23 Xinning Road, Xining, Qinghai 810008, China; University of Chinese Academy of Sciences, China
| | - Sirong Jiang
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, CAS and Qinghai Provincial Key Laboratory of Tibetan Medicine Research, 23 Xinning Road, Xining, Qinghai 810008, China; University of Chinese Academy of Sciences, China
| | - Guoying Zhang
- College of Ecological Environmental engineering, Qinghai University, China
| | - Jianzhong Zhao
- Agricultural and Rural Science and Technology Guidance Development Service Center of Qinghai Province, China
| | - Jiyu Xu
- College of Ecological Environmental engineering, Qinghai University, China
| | - Luya Wang
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, CAS and Qinghai Provincial Key Laboratory of Tibetan Medicine Research, 23 Xinning Road, Xining, Qinghai 810008, China; University of Chinese Academy of Sciences, China
| | - Di Wu
- College of Ecological Environmental engineering, Qinghai University, China
| | - Jihong Tao
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, CAS and Qinghai Provincial Key Laboratory of Tibetan Medicine Research, 23 Xinning Road, Xining, Qinghai 810008, China
| | - Huilan Yue
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, CAS and Qinghai Provincial Key Laboratory of Tibetan Medicine Research, 23 Xinning Road, Xining, Qinghai 810008, China.
| | - Xiaohui Zhao
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, CAS and Qinghai Provincial Key Laboratory of Tibetan Medicine Research, 23 Xinning Road, Xining, Qinghai 810008, China.
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de Araujo IG, Pattaro-Júnior JR, Barbosa CG, Philippsen GS, Silva AR, Ioshino RS, Moraes CB, Freitas-Junior LH, Barros L, Peralta RM, Fernandez MA, Seixas FAV. Potential of plant extracts in targeting SARS-CoV-2 main protease: an in vitro and in silico study. J Biomol Struct Dyn 2023; 41:12204-12213. [PMID: 36651196 DOI: 10.1080/07391102.2023.2166589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 01/01/2023] [Indexed: 01/19/2023]
Abstract
The deaths caused by the covid-19 pandemic have recently decreased due to a worldwide effort in vaccination campaigns. However, even vaccinated people can develop a severe form of the disease that requires ICU admission. As a result, the search for antiviral drugs to treat these severe cases has become a necessity. In this context, natural products are an interesting alternative to synthetic medicines used in drug repositioning, as they have been consumed for a long time through traditional medicine. Many natural compounds found in plant extracts have already been shown to be effective in treating viral and bacterial diseases, making them possible hits to exploit against covid-19. The objective of this work was to evaluate the antiviral activity of different plant extracts available in the library of natural products of the Universidade Estadual de Maringá, by inhibiting the SARS-CoV-2 main protease (Mpro), and by preventing viral infection in a cellular model. As a result, the extract of Cytinus hypocistis, obtained by ultrasound, showed a Mpro inhibition capacity greater than 90%. In the infection model assays using Vero cells, an inhibition of 99.6% was observed, with a selectivity index of 42.7. The in silico molecular docking simulations using the extract compounds against Mpro, suggested Tellimagrandin II as the component of C. hypocistis extract most likely to inhibit the viral enzyme. These results demonstrate the potential of C. hypocistis extract as a promising source of natural compounds with antiviral activity against covid-19.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
| | | | - Cecilia Gomes Barbosa
- Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
- Universidade Municipal de São Caetano do Sul (USCS), São Caetano, Brazil
- Bela Vista, São Paulo, Brazil
| | | | - Ana Rita Silva
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Bragança, Portugal
- Laboratório Associado para a Sustentabilidade e Tecnologia em Regiões de Montanha, (SusTEC), Instituto Politécnico de Bragança, Bragança, Portugal
- Departamento de Ciencias Farmacéuticas, Facultad de Farmacia, CIETUS-IBSAL, Universidad de Salamanca, Salamanca, España
| | | | | | | | - Lillian Barros
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Bragança, Portugal
- Laboratório Associado para a Sustentabilidade e Tecnologia em Regiões de Montanha, (SusTEC), Instituto Politécnico de Bragança, Bragança, Portugal
| | | | - Maria Aparecida Fernandez
- Department of Biotechnology, Genetics and Cell Biology, Universidade Estadual de Maringá, Maringá, P.R. Brazil
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Masota NE, Ohlsen K, Schollmayer C, Meinel L, Holzgrabe U. Isolation and Characterization of Galloylglucoses Effective against Multidrug-Resistant Strains of Escherichia coli and Klebsiella pneumoniae. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27155045. [PMID: 35956993 PMCID: PMC9370434 DOI: 10.3390/molecules27155045] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 08/04/2022] [Accepted: 08/05/2022] [Indexed: 11/28/2022]
Abstract
The search for new antibiotics against multidrug-resistant (MDR), Gram-negative bacteria is crucial with respect to filling the antibiotics development pipeline, which is subject to a critical shortage of novel molecules. Screening of natural products is a promising approach for identifying antimicrobial compounds hosting a higher degree of novelty. Here, we report the isolation and characterization of four galloylglucoses active against different MDR strains of Escherichia coli and Klebsiella pneumoniae. A crude acetone extract was prepared from Paeonia officinalis Linnaeus leaves, and bioautography-guided isolation of active compounds from the extract was performed by liquid–liquid extraction, as well as open column, flash, and preparative chromatographic methods. Isolated active compounds were characterized and elucidated by a combination of spectroscopic and spectrometric techniques. In vitro antimicrobial susceptibility testing was carried out on E. coli and K. pneumoniae using 2 reference strains and 13 strains hosting a wide range of MDR phenotypes. Furthermore, in vivo antibacterial activities were assessed using Galleria mellonella larvae, and compounds 1,2,3,4,6-penta-O-galloyl-β-d-glucose, 3-O-digalloyl-1,2,4,6-tetra-O-galloyl-β-d-glucose, 6-O-digalloyl-1,2,3,4-tetra-O-galloyl-β-d-glucose, and 3,6-bis-O-digalloyl-1,2,4-tri-O-galloyl-β-d-glucose were isolated and characterized. They showed minimum inhibitory concentration (MIC) values in the range of 2–256 µg/mL across tested bacterial strains. These findings have added to the number of known galloylglucoses from P. officinalis and highlight their potential against MDR Gram-negative bacteria.
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Affiliation(s)
- Nelson E. Masota
- Institute of Pharmacy and Food Chemistry, University of Wuerzburg, Sandering 2, 97074 Wuerzburg, Germany
- School of Pharmacy, Muhimbili University of Health and Allied Sciences, Upanga West, Dar es Salaam P.O. Box 65013, Tanzania
| | - Knut Ohlsen
- Institute for Molecular Infection Biology, University of Wuerzburg, Josef-Schneider-Strasse 2, 97080 Wuerzburg, Germany
| | - Curd Schollmayer
- Institute of Pharmacy and Food Chemistry, University of Wuerzburg, Sandering 2, 97074 Wuerzburg, Germany
| | - Lorenz Meinel
- Institute of Pharmacy and Food Chemistry, University of Wuerzburg, Sandering 2, 97074 Wuerzburg, Germany
| | - Ulrike Holzgrabe
- Institute of Pharmacy and Food Chemistry, University of Wuerzburg, Sandering 2, 97074 Wuerzburg, Germany
- Correspondence: ; Tel.: +49-931-3185461
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He HF. Recognition of Gallotannins and the Physiological Activities: From Chemical View. Front Nutr 2022; 9:888892. [PMID: 35719149 PMCID: PMC9198600 DOI: 10.3389/fnut.2022.888892] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 04/15/2022] [Indexed: 11/26/2022] Open
Abstract
Gallotannins, characterized with the glycosidic core and galloyl unit, are seemed as vital components of hydrolyzable tannins. Benefit from the more and more discoveries of their bioactivities and edibility, application of gallotannins in food industry, pharmacy industry, and other fields is increasing. Inheriting previous study achievements, chemical structure of gallotannins was illustrated and degradation as well as synthetic routes to gallotannins were summarized. On this basis, distribution in the nature also including the distinction of gallotannins was discussed. More than that, activities involving in antioxidant, anti-inflammatory, enzyme inhibitions, protein binding, and so on, as well as applications in the field of food industry, biopharmaceutical science, agricultural production, etc., were combed. Finally, improvement of bioavailability, chemical modification of the structure, and accurate determination of new gallotannins were pointed out to be the orientation in the future.
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Affiliation(s)
- Hua-Feng He
- College of Pharmacy, Jining Medical University, Jining, China
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
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Barbeya oleoides Leaves Extracts: In Vitro Carbohydrate Digestive Enzymes Inhibition and Phytochemical Characterization. Molecules 2021; 26:molecules26206229. [PMID: 34684810 PMCID: PMC8540058 DOI: 10.3390/molecules26206229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 10/06/2021] [Accepted: 10/12/2021] [Indexed: 01/06/2023] Open
Abstract
This study investigated the in vitro inhibitory potential of different solvent extracts of leaves of Barbeya oleoides on key enzymes related to type 2 diabetes mellitus (α-glucosidase and α-amylase) in combination with an aggregation assay (using 0.01% Triton X-100 detergent) to assess the specificity of action. The methanol extract was the most active in inhibiting α-glucosidase and α-amylase, with IC50 values of 6.67 ± 0.30 and 25.62 ± 4.12 µg/mL, respectively. However, these activities were significantly attenuated in the presence of 0.01% Triton X-100. The chemical analysis of the methanol extract was conducted utilizing a dereplication approach combing LC-ESI-MS/MS and database searching. The chemical analysis detected 27 major peaks in the negative ion mode, and 24 phenolic compounds, predominantly tannins and flavonol glycosides derivatives, were tentatively identified. Our data indicate that the enzyme inhibitory activity was probably due to aggregation-based inhibition, perhaps linked to polyphenols.
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