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Omonkhua AA, Otitolaiye C, Aguebor-Ogie B, Elekofehinti O, Okello E, Onoagbe I, Okonofua F. Anti-diabetic, anti-pancreatic lipase, and anti-protein glycation potential of Irvingia gabonensis stem bark extracts: in vitro and in silico studies. In Silico Pharmacol 2024; 12:43. [PMID: 38751710 PMCID: PMC11091014 DOI: 10.1007/s40203-024-00219-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 04/28/2024] [Indexed: 05/18/2024] Open
Abstract
Diabetes mellitus is a chronic metabolic disorder that affects glucose, lipid, and protein metabolism. Targeting these metabolic derangements can optimize the therapeutic strategies for this disease. Utilizing in vitro and in silico models, this study investigated the ability of aqueous and ethanol extracts of Irvingia gabonensis to inhibit α-amylase, α-glucosidase, pancreatic lipase, and protein glycation. High-performance liquid chromatography (HPLC) was used to identify the compounds found in the stem bark of I. gabonensis. In silico analysis determined the binding mode and mechanism of interactions between the enzymes and phytochemicals. With an IC50 value of 11.47 µg/ml, the aqueous extract demonstrated higher inhibitory efficacy against α-amylase compared to the ethanol extract (IC50 19.88 µg/ml). However, the ethanol extract had stronger inhibitory activities against α-glucosidase, pancreatic lipase, and protein glycation compared to the aqueous extract (IC50 values of 3.05, 32.85, 0.0014 versus 25.72, 332.42, 0.018 µg/ml respectively). Quercetin ranked highest in binding energy with α-amylase (-6.6 kcal/mol), α-glucosidase (-6.6 kcal/mol), and pancreatic lipase (-5.6 kcal/mol). This was followed by rhamnetin (6.5, 6.5, and 6.1 kcal/mol respectively). Hydrogen bonding, hydrophobic interactions, and pi-pi stacking are forces responsible for the binding of quercetin and rhamnetin to these enzymes. Molecular dynamics simulation showed that the lead phytochemicals formed stable and energetically stabilized complexes with the target proteins. This study showed that the extracts of I. gabonensis stem bark had significant in vitro anti-diabetic, anti-pancreatic lipase, and anti-protein glycation activities. The strong binding affinities of some of the identified compounds could be responsible for the inhibitory potential of the extracts. I. gabonensis stem bark could be further explored as a natural remedy for the treatment of diabetes mellitus and its complications.
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Affiliation(s)
- Akhere A. Omonkhua
- Department of Medical Biochemistry, School of Basic Medical Sciences, University of Benin, Benin, Nigeria
| | - Catherine Otitolaiye
- Department of Medical Biochemistry, School of Basic Medical Sciences, University of Benin, Benin, Nigeria
- Department of Biochemistry, Faculty of Science, Sokoto State University, Sokoto, Nigeria
| | - Bobby Aguebor-Ogie
- Department of Medical Biochemistry, School of Basic Medical Sciences, University of Benin, Benin, Nigeria
| | - Olusola Elekofehinti
- Department of Biochemistry, School of Life Sciences, Federal University of Technology, Akure, Nigeria
| | - Edward Okello
- Human Nutrition Research Centre, Population Health Sciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Iyere Onoagbe
- Department of Biochemistry, Faculty of Life Sciences, University of Benin, Benin, Nigeria
| | - Friday Okonofua
- Department of Obstetrics and Gynaecology, School of Medicine, University of Benin, Benin, Nigeria
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Ghosh AK, Panda SK, Hu H, Schoofs L, Luyten W. Compounds isolation from Syzygium cumini leaf extract against the Vibrio species in shrimp through bioassay-guided fractionation. Nat Prod Res 2024:1-11. [PMID: 38648539 DOI: 10.1080/14786419.2024.2344192] [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: 08/30/2023] [Accepted: 04/09/2024] [Indexed: 04/25/2024]
Abstract
This study was conducted to isolate and identify the bioactive compounds from the ethanolic extract of Syzygium cumini leaf against Vibrio species through a bioassay-guided fractionation. The ethanol extract was exposed to silica gel chromatography followed by reversed phase HPLC to isolate the most effective fraction against V. parahaemolyticus. Using further UHPLC-orbitrap-ion trap mass spectrometry, five compounds were isolated with broad-spectrum potency against a range of Vibrio species viz. V. parahaemolyticus, V. alginolyticus, V. harveyi, V. vulnificus and V. anguillarum. The IC50 values for the compounds ranged from 8 to 48 µg/mL against the most sensitive species V. vulnificus and 58 to >400 µg/mL against V. alginolyticus. The results of the toxicity tests demonstrated that the compounds were not harmful for shrimp. The study's findings indicate that S. cumini leaf extract may contain bioactive molecules that are able to be substituted for antibiotics to treat vibriosis in shrimp farming.
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Affiliation(s)
- Alokesh Kumar Ghosh
- Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna, Bangladesh
| | - Sujogya Kumar Panda
- Center of Environment Climate Change and Public Health, Utkal University, Bhubaneswar, India
| | - Haibo Hu
- School of Pharmacy, Gannan Medical University, Ganzhou, Jiangxi, China
| | - Liliane Schoofs
- Animal Physiology and Neurobiology Section, Department of Biology, Faculty of Science, KU Leuven, Leuven, Belgium
| | - Walter Luyten
- Animal Physiology and Neurobiology Section, Department of Biology, Faculty of Science, KU Leuven, Leuven, Belgium
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Zhang J, Li W, Zhang B, Zhang G, Liu C. Screening of angiotensin converting enzyme inhibitors from natural products via origami microfluidic paper-based analytical devices with colorimetric detection. J Pharm Biomed Anal 2024; 238:115833. [PMID: 37926038 DOI: 10.1016/j.jpba.2023.115833] [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: 09/26/2023] [Revised: 10/27/2023] [Accepted: 10/30/2023] [Indexed: 11/07/2023]
Abstract
We report the screening of angiotensin converting enzyme (ACE) inhibitors on an origami microfluidic paper-based analytical device (μPAD) using colorimetric detection. The hydrolysis product reacts with ninhydrin, resulting in a purple color at the detection zones. Images of the μPADs are captured using a common cell phone and analyzed with Photoshop software. This platform allows six independent colorimetric reactions to take place simultaneously, and the IC50 values can be obtained in a single run within 22 min. The relative standard deviations of inhibition efficiencies are generally lower than 4.0 % (n = 5). The IC50 values of captopril and five products from natural plants were obtained and corresponded well with UV methods. The relative deviations between the two methods are within the range of -5 % to +5 %. This work is a proof-of-concept successfully demonstrating the use of μPADs technology to screen enzyme inhibitors from natural products.
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Affiliation(s)
- Jian Zhang
- School of Pharmacy, Xi' an Medical University, Xi'an 710021, China; Institute of Medicine, Xi' an Medical University, Xi'an 710021, China
| | - Wenjing Li
- School of Pharmacy, Xi' an Medical University, Xi'an 710021, China; Institute of Medicine, Xi' an Medical University, Xi'an 710021, China
| | - Bo Zhang
- School of Pharmacy, Xi' an Medical University, Xi'an 710021, China
| | - Guangju Zhang
- School of Pharmacy, Xi' an Medical University, Xi'an 710021, China
| | - Chunye Liu
- School of Pharmacy, Xi' an Medical University, Xi'an 710021, China; Institute of Medicine, Xi' an Medical University, Xi'an 710021, China.
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Aydin T, Saglamtas R, Gumustas M, Genisel M, Kazaz C, Cakir A. Lavandula stoechas L. subsp. stoechas, a New Herbal Source for Ursolic Acid: Quantitative Analysis, Purification and Bioactivity Studies. Chem Biodivers 2023; 20:e202300414. [PMID: 37338138 DOI: 10.1002/cbdv.202300414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 06/18/2023] [Accepted: 06/19/2023] [Indexed: 06/21/2023]
Abstract
In this study, methanol, ethanol, methanol-dichloromethane (1 : 1, v/v), acetone, ethyl acetate, diethyl ether, and chloroform extracts of lavender (Lavandula stoechas L. subsp. stoechas) were prepared by maceration, and the ursolic acid contents in the extracts were determined quantitatively by HPLC analyses. The present results show that the methanol-dichloromethane (1 : 1, v/v) solvent system is the most efficient solvent system for the extraction of ursolic acid from the plant sample with the highest yield (2.22 g/100 g plant sample). In the present study, a new practical method for the isolation of ursolic acid from polar extracts was also demonstrated for the first time. The inhibition effects of the extracts and ursolic acid were also revealed on α-glycosidase, acetylcholinesterase, butyrylcholinesterase, and human carbonic anhydrase I and II enzymes by determining IC50 values for the first time. The extracts and ursolic acid acted as potent antidiabetic agents by strongly inhibiting the α-glycosidase activity, whereas they were found to be very weak neuroprotective agents. In view of the present results, L. stoechas and its major metabolite, ursolic acid, can be recommended as a herbal source to control postprandial blood sugar levels and prevent diabetes by delaying the digestion of starch in food.
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Affiliation(s)
- Tuba Aydin
- Department of Pharmacognosy, Faculty of Pharmacy, Ağrı İbrahim Çeçen University, Agri, 04100, Türkiye
| | - Ruya Saglamtas
- Vocational School of Health Services, Ağrı İbrahim Çeçen University, Agri, 04100, Türkiye
- Central Research and Application Laboratory, Ağrı İbrahim Çeçen University, Agri, 04100, Türkiye
| | - Mehmet Gumustas
- Pediatric Cardiology Department, Başakşehir Çam and Sakura City Hospital, Istanbul, 34000, Türkiye
| | - Mucip Genisel
- Department of Pharmaceutical Botany, Faculty of Pharmacy, Ağrı İbrahim Çeçen University, Agri, 04100, Türkiye
| | - Cavit Kazaz
- Department of Chemistry, Faculty of Science, Atatürk University, Erzurum, 25000, Türkiye
| | - Ahmet Cakir
- Department of Chemistry, Faculty of Science, Kilis 7 Aralık University, Kilis, 79000, Türkiye
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Nguyen M, Thi BHB, Maskey S, Tran M, Nguyen Q. In vitro and in vivo antioxidant and antihyperglycemic potentials of phenolic fractions of Syzygium zeylanicum (L.) DC trunk-bark. Food Sci Nutr 2023; 11:3875-3884. [PMID: 37457151 PMCID: PMC10345726 DOI: 10.1002/fsn3.3373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 03/22/2023] [Accepted: 03/30/2023] [Indexed: 07/18/2023] Open
Abstract
Syzygium zeylanicum L. (DC) (SZL) has been used in antidiabetes treatment for ages. However, the scientific evidence of active agents that have antidiabetic activity and response against biological activities is limited. In this study, the active components of SZL trunk-bark extract (SZL extract) were identified using principal component analysis (PCA), and their antidiabetic activities were assessed. The results indicated that the ethyl acetate fraction (EAF) had the highest concentration of phenolic compounds, antioxidants, and antihyperglycemic activities in the postprandial zebrafish model. The major antioxidant contributors were gallic acid, catechin, epicatechin, ellagic acid, quercetin, caffeine, and apigenin, and their concentrated levels reduced α-amylase inhibitory activity, whereas rutin and ethyl gallate influenced the α-glucosidase inhibitory activity. This study showed the bio-functional properties of active phenolic compounds present in the SZL extract, potentially serving as a functional food to control hyperglycemia.
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Affiliation(s)
- Minh‐Trung Nguyen
- Institute of Biotechnology and EnvironmentTay Nguyen UniversityBuon Ma ThuotVietnam
- Faculty of Natural Science and TechnologyTay Nguyen UniversityBuon Ma ThuotVietnam
| | - Bich Huyen Bui Thi
- Institute of Biotechnology and EnvironmentTay Nguyen UniversityBuon Ma ThuotVietnam
| | - Shila Maskey
- Patan Multiple CampusTribhuvan UniversityPatanNepal
| | - Minh‐Dinh Tran
- Institute of Biotechnology and EnvironmentTay Nguyen UniversityBuon Ma ThuotVietnam
| | - Quang‐Vinh Nguyen
- Institute of Biotechnology and EnvironmentTay Nguyen UniversityBuon Ma ThuotVietnam
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Wang YF, Lin P, Huang YL, He RJ, Yang BY, Liu ZB. Isolation of Two New Phenolic Glycosides from Castanopsis chinensis Hance by Combined Multistep CC and HSCCC Separation and Evaluation of Their Antioxidant Activity. Molecules 2023; 28:molecules28083331. [PMID: 37110565 PMCID: PMC10143513 DOI: 10.3390/molecules28083331] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 04/04/2023] [Accepted: 04/05/2023] [Indexed: 04/29/2023] Open
Abstract
The characteristics of high polarity and susceptibility to oxidation in phenolic glycosides increase the difficulty of their separation from natural products. In the present study, two new phenolic glycosides with similar structures were isolated from Castanopsis chinensis Hance using a combination of multistep CC and high-speed countercurrent chromatography. Preliminary separation of the target fractions was carried out by Sephadex LH-20 chromatography (100-0% EtOH in H2O). High-speed countercurrent chromatography with an optimized solvent system of N-Hexane/Ethyl acetate/Methanol/Water (1:6:3:4, v/v/v/v) with a satisfactory stationary phase retention and separation factor was used for further separation and purification of the phenolic glycosides. Consequently, two new phenolic glycoside compounds were obtained with purities of 93.0% and 95.7%. 1D-NMR and 2D-NMR spectroscopy, mass spectrometry, and optical rotation were employed to identify their structures, which were assigned as chinensin D and chinensin E. The antioxidant and α-glucosidase inhibitory activities of these two compounds were evaluated using a DPPH antioxidant assay and a α-glucosidase inhibitory assay. Both compounds showed good antioxidant activity with IC50 values of 54.5 ± 0.82 µg/mL and 52.5 ± 0.47 µg/mL. The α-glucosidase inhibitory activity of the compounds was poor. The successful isolation and structure identification of the two new compounds provides materials not only for a systematic isolation method of phenolic glycosides with similar structures, but also for the screening of antioxidants and enzyme inhibitors.
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Affiliation(s)
- Ya-Feng Wang
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China
| | - Ping Lin
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China
| | - Yong-Lin Huang
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China
| | - Rui-Jie He
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China
| | - Bing-Yuan Yang
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China
| | - Zhang-Bin Liu
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China
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Thinned Nectarines, an Agro-Food Waste with Antidiabetic Potential: HPLC-HESI-MS/MS Phenolic Characterization and In Vitro Evaluation of Their Beneficial Activities. Foods 2022; 11:foods11071010. [PMID: 35407097 PMCID: PMC8997825 DOI: 10.3390/foods11071010] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 03/25/2022] [Accepted: 03/28/2022] [Indexed: 02/04/2023] Open
Abstract
Due to the side effects of synthetic drugs, the interest in the beneficial role of natural products in the management of diabetic conditions is growing over time. In the context of agro-food waste products, a screening of different fruit thinning by-products identified thinned nectarines (TN) as the richest matrices of abscisic acid (ABA), a phytohormone with well-documented hypoglycemic potential. These waste-food matrices may represent not only precious sources of ABA but also other bioactive molecules with potential health benefits, such as polyphenols. Therefore, we aimed to perform a qualitative and quantitative characterization of a polyphenolic profile of a TN-based nutraceutical formulation through HPLC-HESI-MS/MS and HPLC-DAD-FLD analyses. Additionally, the in vitro antioxidant and antidiabetic potential of TN was investigated. HPLC analyses allowed us to identify forty-eight polyphenolic compounds, nineteen of which were quantified. Moreover, the results obtained through different in vitro assays showed the antioxidant and antidiabetic potential exerted by the tested nutraceutical formulation. In conclusion, the concomitant presence of different bioactive compounds in TN-based nutraceutical formulation, such as ABA and polyphenols, would reasonably support TN as an innovative nutraceutical formulation useful for the management of glucose homeostasis. Further in-depth animal-based studies and clinical trials are needed to deepen these aspects.
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Li XM, Pang N, Wang YF, He RJ, Ge L, Yang BY, Yang KD, Huang YL. Two new isoflavones from the barks of Dalbergia hancei Benth. Nat Prod Res 2022:1-7. [PMID: 35300550 DOI: 10.1080/14786419.2022.2048380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Two new isoflavone compounds, Dalhancei A (1) and Dalhancei B (2), along with a known compound epicatechin (3) were isolated from 80% methanol extract of the barks of Dalbergia hancei Benth. The structures of compounds 1-3 were elucidated by comparison with the literature and physical data analysis, including optical rotation, MS, 1D and 2D NMR spectra. Compounds 1 and 2 showed weak inhibitory activity against tyrosinase at 16.22 mmol/L, with inhibition rates of 42.23 ± 0.18% and 45.68 ± 0.17%, respectively; compound 1 exhibited weak inhibitory activity against α-glucosidase with the inhibition rate of 43.72 ± 0.22% at 5.41 mmol/L, compounds 2 and 3 had better α-glucosidase inhibitory activity than compound 1 with IC50 values of 0.90 ± 0.18 and 0.41 ± 0.17 mmol/L, respectively.
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Affiliation(s)
- Xiao-Mei Li
- Medical College of Guangxi University, Nanning, Guangxi, China.,Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization, Guangxi Institute of Botany, China Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi, China
| | - Nao Pang
- Medical College of Guangxi University, Nanning, Guangxi, China
| | - Ya-Feng Wang
- Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization, Guangxi Institute of Botany, China Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi, China
| | - Rui-Jie He
- Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization, Guangxi Institute of Botany, China Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi, China
| | - Li Ge
- Medical College of Guangxi University, Nanning, Guangxi, China
| | - Bing-Yuan Yang
- Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization, Guangxi Institute of Botany, China Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi, China
| | - Ke-Di Yang
- Medical College of Guangxi University, Nanning, Guangxi, China
| | - Yong-Lin Huang
- Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization, Guangxi Institute of Botany, China Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi, China
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Vedasree N, Peddanna K, Rajasekhar A, ParthaSarathi C, Munirajeswari P, Sireesha Y, Chippada AR. Efficacy of Cyanotis tuberosa (Roxb.) Schult. &Schult. f. root tubers' active fraction as anti-diabetic, antihyperlipidemic and antioxidant in Streptozotocin-induced diabetic rats. JOURNAL OF ETHNOPHARMACOLOGY 2022; 285:114856. [PMID: 34808300 DOI: 10.1016/j.jep.2021.114856] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 11/09/2021] [Accepted: 11/17/2021] [Indexed: 06/13/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Cyanotis tuberosa (Roxb.) Schult. &Schult.f. is traditionally used as ethnomedicine for curing several ailments like diabetes, liver problems, ulcers, etc. OBJECTIVE: The present study was designed to evaluate the anti-diabetic potential of Cyanotis tuberosa root tubers (CTRT)in Streptozotocin (STZ) induced diabetic rats. MATERIALS AND METHODS Anti-hyperglycemic activity of hexane extract of CTRT was investigated in diabetic rats. Silica gel chromatography was used to fractionate the hexane extract and the fraction's antihyperglycemic activity was checked in diabetic rats. Effects of long-term (30 days) treatment with an active fraction (CTAF) were evaluated in diabetic rats for 30 days by measurement of body weights, glycemic control, insulin levels, HbA1c, and serum and tissue lipid profiles. Lipid peroxide levels and antioxidant status were measured in the liver and kidney. Hepatic and Renal functional markers were also measured. Phytochemical characterization of CTAF was carried out by LC-ESI-MS/MS analysis. RESULTS Hexane extract of CTRT at a dose of 750 mg/kg b.w produced significant antihyperglycemic activity in diabetic rats whereas CTAF has produced maximum antihyperglycemic activity at the dose of 75 mg/kg b.w. Following long-term treatment with CTAF in diabetic rats, significant improvement in glycemic control, (HbA1c) along with decreased insulin resistance (HOMA-IR), increase in body weights, and plasma insulin were observed. Also, CTAF ameliorated the serum and tissue lipid profiles. In addition, CTAF suppressed lipid peroxidation and restored the activities of antioxidant enzymes in the liver and kidney to normal levels. Further, CTAF reversed the liver and kidney functional markers to normalcy. LC-ESI-MS/MS analysis revealed the presence of 7 different phytoconstituents. CONCLUSION This study confirmed that CTAF exerts antidiabetic effects in diabetic rats by improving insulin secretion, glycemic control, and restoring functional activities of the liver and kidney. Our results suggest that root tubers of Cyanotis tuberosa can be used as a complementary or alternative agent for the treatment of diabetes mellitus.
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Affiliation(s)
- Nalluri Vedasree
- Department of Biochemistry, Sri Venkateswara University, Tirupati, Andhra Pradesh, India
| | - Kotha Peddanna
- Department of Biochemistry, Sri Venkateswara University, Tirupati, Andhra Pradesh, India
| | - Allagadda Rajasekhar
- Department of Biochemistry, Sri Venkateswara University, Tirupati, Andhra Pradesh, India
| | | | | | - Yallanki Sireesha
- Department of Biochemistry, Sri Venkateswara University, Tirupati, Andhra Pradesh, India
| | - Appa Rao Chippada
- Department of Biochemistry, Sri Venkateswara University, Tirupati, Andhra Pradesh, India.
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Ortega R, Valdés M, Alarcón-Aguilar FJ, Fortis-Barrera Á, Barbosa E, Velazquez C, Calzada F. Antihyperglycemic Effects of Salvia polystachya Cav. and Its Terpenoids: α-Glucosidase and SGLT1 Inhibitors. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11050575. [PMID: 35270046 PMCID: PMC8912538 DOI: 10.3390/plants11050575] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 02/13/2022] [Accepted: 02/17/2022] [Indexed: 06/02/2023]
Abstract
The antihyperglycemic activity of ethanolic extract from Salvia polystachya (EESpS) and its products was evaluated using in vivo, ex vivo and in silico assays; additionally, an acute toxicity assay was evaluated. EESpS was classified as a nontoxic class 5 drug. EESpS, ethyl acetate fraction (EtOAcFr), secondary-6-fraction (SeFr6), ursolic acid (UA), and oleanolic acid (OA) reduced the hyperglycemia in DM2 mice. α-glucosidase inhibition was evaluated with oral sucrose and starch tolerance tests (OSuTT and OStTT), an intestinal sucrose hydrolysis (ISH) assay and molecular docking studies using acarbose as control. SGLT1 inhibition was evaluated with oral glucose and galactose tolerance tests (OGTT and OGaTT), an intestinal glucose absorption (IGA) assay and molecular docking studies using canagliflozin as the control. During the carbohydrate tolerance tests, all the treatments reduced the postprandial peak, similar to the control drugs. During the ISH, IC50 values of 739.9 and 726.3 µM for UA and OA, respectively, were calculated. During the IGA, IC50 values of 966.6 and 849.3 for UA, OA respectively, were calculated. Finally, during the molecular docking studies, UA and OA showed ∆G values of -6.41 and -5.48 kcal/mol-1, respectively, on α-glucosidase enzymes. During SGLT1, UA and OA showed ∆G values of -10.55 and -9.65, respectively.
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Affiliation(s)
- Rocio Ortega
- Doctorado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, UAM-I, Mexico City CP 09340, Mexico
- Av. San Rafael Atlixco 186, Leyes de Reforma 1ra Sección, Iztapalapa, Mexico City CP 09340, Mexico
- Unidad de Investigación Médica en Farmacología, UMAE Hospital de Especialidades, 2° Piso CORSE Centro Médico Nacional Siglo XXI, IMSS, Av. Cuauhtémoc 330, Col. Doctores, Mexico City CP 06725, Mexico
| | - Miguel Valdés
- Unidad de Investigación Médica en Farmacología, UMAE Hospital de Especialidades, 2° Piso CORSE Centro Médico Nacional Siglo XXI, IMSS, Av. Cuauhtémoc 330, Col. Doctores, Mexico City CP 06725, Mexico
| | - Francisco J. Alarcón-Aguilar
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, División de CBS, Universidad Autónoma Metropolitana-Iztapalapa, UAM-I, Av. San Rafael Atlixco 186, Leyes de Reforma 1ra Sección, Mexico City CP 09340, Mexico; (F.J.A.-A.); (Á.F.-B.)
| | - Ángeles Fortis-Barrera
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, División de CBS, Universidad Autónoma Metropolitana-Iztapalapa, UAM-I, Av. San Rafael Atlixco 186, Leyes de Reforma 1ra Sección, Mexico City CP 09340, Mexico; (F.J.A.-A.); (Á.F.-B.)
| | - Elizabeth Barbosa
- Escuela Superior de Medicina, Instituto Politécnico Nacional, Salvador Díaz Mirón esq. Plan de San Luis S/N, Miguel Hidalgo, Casco de Santo Tomas, Mexico City CP 11340, Mexico;
| | - Claudia Velazquez
- Área Académica de Farmacia, Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Km 4.5, Carretera Pachuca-Tulancingo, Unidad Universitaria, Pachuca CP 42076, Mexico;
| | - Fernando Calzada
- Unidad de Investigación Médica en Farmacología, UMAE Hospital de Especialidades, 2° Piso CORSE Centro Médico Nacional Siglo XXI, IMSS, Av. Cuauhtémoc 330, Col. Doctores, Mexico City CP 06725, Mexico
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Peter EL, Nagendrappa PB, Hilonga S, Tuyiringire N, Ashuro E, Kaligirwa A, Sesaazi CD. Pharmacological reflection of plants traditionally used to manage diabetes mellitus in Tanzania. JOURNAL OF ETHNOPHARMACOLOGY 2021; 269:113715. [PMID: 33358853 DOI: 10.1016/j.jep.2020.113715] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 12/01/2020] [Accepted: 12/18/2020] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The increasing national prevalence of diabetes mellitus (DM) and its complications have overstretched the health care system in Tanzania and influenced patients to use herbal medicines as alternative therapeutic strategies. Therefore, an urgent need exists to validate the safety and efficacy of plants used locally. AIM OF THE STUDY To identify plants used for the management of DM in Tanzania and analyses their pharmacological, phytochemistry, and safety evidence with a special focus on the mechanism of action. METHODS Researchers searched Medline, web of science, and Scopus for published articles. Also, specialized herbarium documents of Muhimbili Institute of traditional medicine were reviewed. Articles were assessed for relevance, quality, and taxonomical accuracy before being critically reviewed. RESULTS We identified 62 plant species used locally for DM management. Moringa oleifera Lam. and Cymbopogon citratus (D.C) stapf were the most mentioned. Fifty-four phytochemicals from 13 species had DM activities. These were mainly; polyphenolics, phytosterols, and triterpenoids. Extracts, fractions, and pure compounds from 18 species had in vitro antidiabetic activities of which 14 had α-glucosidase and α-amylase inhibition effects. The most studied -Momordica charantia L. increased; glucose uptake and adiponectin release in 3T3-L1 adipocytes, insulin secretion, insulin receptor substrate-1 (IRS-1), GLUT-4 translocation, and GLP-1 secretion; and inhibited protein tyrosine phosphatase 1 B (PTP1B). Preclinical studies reported 30 species that lower plasma glucose with molecular targets in the liver, skeletal muscles, adipose tissues, pancreases, and stomach. While three species; Aspilia mossambiscensis (Oliv.) Willd, Caesalpinia bonduc (L.) Roxb, and Phyllanthus amarus Schumach. & Thonn. had mild toxicity in animals, 33 had no report of their efficacy in DM management or toxicity. CONCLUSION Local communities in Tanzania use herbal medicine for the management of DM. However, only a fraction of such species has scientific evidence. A. mossambiscensis, C. bonduc., and P. amarus had mild toxicity in animals. Together, our findings call for future researches to focus on in vitro, in vivo, and phytochemical investigation of plant species for which their use in DM among the local communities in Tanzania have not been validated.
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Affiliation(s)
- Emanuel L Peter
- Department of Pharmacy, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda.
| | - Prakash B Nagendrappa
- Centre for Local Health Traditions & Policy, The University of Trans-disciplinary Health Sciences and Technology, Bengaluru, India.
| | - Samson Hilonga
- Institute of Traditional Medicine, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania.
| | - Naasson Tuyiringire
- Department of Pharmacy, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda.
| | - Efrata Ashuro
- Department of Pharmacy, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda.
| | - Anita Kaligirwa
- Department of Pharmacology, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda.
| | - Crispin Duncan Sesaazi
- Department of Pharmaceutical Sciences, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda.
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Antidiabetic Activity of Widely Used Medicinal Plants in the Sri Lankan Traditional Healthcare System: New Insight to Medicinal Flora in Sri Lanka. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2021; 2021:6644004. [PMID: 33628307 PMCID: PMC7886531 DOI: 10.1155/2021/6644004] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 01/30/2021] [Accepted: 02/01/2021] [Indexed: 12/19/2022]
Abstract
The use of medicinal plant extracts and their isolated bioactive compounds for the management of diabetes mellitus has been tremendously increased in recent decades. The present study aimed at providing in-depth information on medicinal flora that has been widely used in the Sri Lankan traditional healthcare system for the management of diabetes mellitus. The data of this review article were obtained from published articles from January 2000 to September 2020 in scientific databases of PubMed, Web of Science, and Google Scholar. In this review, a total number of 18 medicinal plants with the antidiabetic activity were expressed, and their isolated antidiabetic active compounds were highlighted as new drug leads. Results of the reported studies revealed that medicinal plants exert a potent antidiabetic activity via both in vitro and in vivo study settings. However, bioactive compounds and antidiabetic mechanism (s) of action of many of the reported medicinal plants have not been isolated/elucidated the structure in detail, to date. Reported antidiabetic medicinal plants with other properties such as antioxidant and antihyperlipidemic activities deliver new entities for the development of antidiabetic agents with multiple therapeutic targets. This is a comprehensive review on potential antidiabetic activities of the Sri Lankan medicinal plants that have been widely used in the traditional healthcare system. The information presented here would fill the gap between the use of them by traditional healers in the traditional medicine healthcare system in Sri Lanka and their potency for development of new drug entities in future.
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Kim S, Semple SJ, Simpson BS, Deo P. Antioxidant and Antiglycation Activities of Syzygium paniculatum Gaertn and Inhibition of Digestive Enzymes Relevant to Type 2 Diabetes Mellitus. PLANT FOODS FOR HUMAN NUTRITION (DORDRECHT, NETHERLANDS) 2020; 75:621-627. [PMID: 33009631 DOI: 10.1007/s11130-020-00858-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/22/2020] [Indexed: 06/11/2023]
Abstract
Advanced glycation end-products (AGEs) may be a contributing factor in the development of diabetes-specific vascular pathologies that affect the retina, glomerulus and peripheral nerves. In this study, Australian native food plant species Syzygium paniculatum was investigated for activities relevant to Type 2 diabetes mellitus including inhibition of α-amylase, α-glucosidase and protein glycation. A methanolic extract of the leaves showed the strongest α-amylase inhibition (IC50 = 14.29 ± 0.82 μg/mL, p < 0.05) when compared with other extracts. For inhibition of α-glucosidase, the strongest inhibition was shown for the water, methanolic and acetone extracts of leaves with IC50 values ranging from 4.73 ± 0.96 to 7.26 ± 0.92 μg/mL. In the BSA-glucose model, fruit and leaf extracts inhibited formation of protein-bound fluorescent AGEs with IC50 values ranging between 11.82 ± 0.71 and 96.80 ± 13.41 μg/mL. Pearson's correlation analysis showed that the AGE inhibition significantly correlated with DPPH (rp = -0.8964, p < 0.05) and ABTS (rp = -0.8326, p < 0.05). α-amylase inhibitory activities strongly correlated with DPPH (rp = -0.8964, p < 0.001). α-glucosidase inhibition strongly correlated with TPC (rp = -0.9243, p < 0.05), FRAP (rp = -0.9502, p < 0.01), DPPH (rp = -0.9317, p < 0.01) and ABTS (rp = -0.9486, p < 0.01). This study provides a strong rationale for further investigation aimed at isolating and identifying the active compounds responsible for the observed effects on targets relevant to diabetes.
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Affiliation(s)
- Sangseo Kim
- Health and Biomedical Innovation, Clinical and Health Sciences, University of South Australia, Adelaide, South Australia, 5000, Australia
| | - Susan J Semple
- Quality Use of Medicines and Pharmacy Research Centre, Clinical and Health Sciences, University of South Australia, Adelaide, South Australia, 5000, Australia
| | - Bradley S Simpson
- Health and Biomedical Innovation, Clinical and Health Sciences, University of South Australia, Adelaide, South Australia, 5000, Australia
| | - Permal Deo
- Health and Biomedical Innovation, Clinical and Health Sciences, University of South Australia, Adelaide, South Australia, 5000, Australia.
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Acylated Aminooligosaccharides from the Yellow Sea Streptomyces sp. HO1518 as Both α-Glucosidase and Lipase Inhibitors. Mar Drugs 2020; 18:md18110576. [PMID: 33233702 PMCID: PMC7699847 DOI: 10.3390/md18110576] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 11/08/2020] [Accepted: 11/10/2020] [Indexed: 12/20/2022] Open
Abstract
Three new acylated aminooligosaccharide (1-3), along with five known congeners (4-8), were isolated from the marine-derived Streptomyces sp. HO1518. Their structures were fully elucidated by extensive spectroscopic analysis, mainly based on 1D-selective and 2D TOCSY, HSQC-TOCSY, and HRESIMS spectrometry measurements, and by chemical transformations. All of the compounds were evaluated for their α-glucosidase and pancreatic lipase inhibitory activities. Among the isolates, D6-O-isobutyryl-acarviostatin II03 (3) and D6-O-acetyl-acarviostatin II03 (8), sharing acarviostatin II03-type structure, showed the most potent α-glucosidase and lipase inhibitory effects, far stronger than the antidiabetic acarbose towards α-glucosidase and almost equal to the anti-obesity orlistat towards lipase in vitro. This is the first report on inhibitory activities against the two major digestive enzymes for acylated aminooligosaccharides. The results from our investigation highlight the potential of acylated aminooligosaccharides for the future development of multi-target anti-diabetic drug.
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Franco RR, Ribeiro Zabisky LF, Pires de Lima Júnior J, Mota Alves VH, Justino AB, Saraiva AL, Goulart LR, Espindola FS. Antidiabetic effects of Syzygium cumini leaves: A non-hemolytic plant with potential against process of oxidation, glycation, inflammation and digestive enzymes catalysis. JOURNAL OF ETHNOPHARMACOLOGY 2020; 261:113132. [PMID: 32673709 DOI: 10.1016/j.jep.2020.113132] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/29/2020] [Accepted: 06/21/2020] [Indexed: 06/11/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Plant materials are commonly used in traditional medicine in order to treat various diseases such as Diabetes mellitus. Some plants, such as Syzygium cumini, have the capability to act controlling oxidative stress and protein glycation besides their potential to decrease hyperglycemia and hyperlipidemia by the inhibition of the catalysis of digestive enzymes. The aim of this study was to evaluate the antioxidant and antiglicant activity of S. cumini leaves fractions, their capacity to inhibit hydrolases and lipase enzymes, as well as the cytotoxicity effects against erythrocytes and comparate these results with isolate quercetin flavonoid. MATERIAL AND METHODS Ethnobotanical researches, carried out by academic studies at the Federal University of Uberlandia, led us to choose S. cumini as a potential plant for treatment of Diabetes mellitus. Fractions from ethanolic extract of S. cumini (hexane/Hex, dichloromethane/DCM, ethyl acetate/EtOAc, n-butanol/ButOH and water/H2O) were used to evaluate their antioxidant (DPPH, ORAC and FRAP) and antiglycant (BSA/fructose, BSA/methylglyoxal and Arginine/Methylglyoxal) activity as well as the inhibitory potential against α-amylase, α-glucosidase and lipase. In addition, identification of the main bioactive compounds of S. cuimini leaves by HPLC-ESIMS/MS analysis was carried out. RESULTS Our results indicate that all fractions, for exception Hex, present noteworthy antioxidant activity, mainly in EtOAc and ButOH fractions (FRAP 1154.49 ± 67.37 and 1178.27 ± 21.26 μmol trolox eq g-1, respectively; ORAC 1224.63 ± 58.16 and 1313.53 ± 85.23 μmol trolox eq g-1, respectively; DPPH IC50 15.7 ± 2.4 and 23.5 ± 2.7 μg mL-1, respectively). Regarding the antiglycant activity (BSA/fructose and Arginine/Methylglyoxal models), all fraction, for exception Hex, presented inhibition higher than 85%. All fractions were capable to inhibit 100% of α-amylase and the fractions DCM, EtOAc and ButOH inhibited α-glucosidase more than 50%. Regarding the lipase assay, DCM and Hex had the best activity (31.5 ± 14.3 and 44.3 ± 4.5 μg mL-1, respectively). Various biomolecules known as potent antioxidants were identified in these fractions, such as quercetin, kaempferol, luteolin and (Epi)catechin. CONCLUSION S. cumini fractions and quercetin presented promising antioxidant and antiglycation properties as well as the ability to inhibit digestive enzymes. This study presents new biological activities not yet described for S. cumini which provide new possibilities for further studies in order to assess the antidiabetic potential of S. cumini fractions especially EtOAc and ButOH.
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Affiliation(s)
- Rodrigo Rodrigues Franco
- Postgraduate Program in Genetics and Biochemistry, Institute of Biotechnology (IBTEC), Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | - Luiz Fernando Ribeiro Zabisky
- Postgraduate Program in Genetics and Biochemistry, Institute of Biotechnology (IBTEC), Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | - Joed Pires de Lima Júnior
- Postgraduate Program in Cell Biology, Institute of Biomedical Sciences (ICBIM), Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | - Victor Hugo Mota Alves
- Postgraduate Program in Genetics and Biochemistry, Institute of Biotechnology (IBTEC), Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | - Allisson Benatti Justino
- Postgraduate Program in Genetics and Biochemistry, Institute of Biotechnology (IBTEC), Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | - André Lopes Saraiva
- Postgraduate Program in Genetics and Biochemistry, Institute of Biotechnology (IBTEC), Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | - Luiz Ricardo Goulart
- Postgraduate Program in Genetics and Biochemistry, Institute of Biotechnology (IBTEC), Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil
| | - Foued Salmen Espindola
- Postgraduate Program in Genetics and Biochemistry, Institute of Biotechnology (IBTEC), Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil.
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Jugran AK, Rawat S, Devkota HP, Bhatt ID, Rawal RS. Diabetes and plant-derived natural products: From ethnopharmacological approaches to their potential for modern drug discovery and development. Phytother Res 2020; 35:223-245. [PMID: 32909364 DOI: 10.1002/ptr.6821] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 06/08/2020] [Accepted: 07/02/2020] [Indexed: 02/06/2023]
Abstract
Diabetes is a disease of serious concern faced by the health care industry today. Primary diabetes mellitus and its complications are still costly to manage with modern drugs. Extensive research on the screening of anti-diabetic agents in past decades established natural products as one of the major potential sources of drug discovery. However, only a few drugs of plant origin have been scientifically validated. Therefore, the development of new anti-diabetic drugs is of great demand. Hence, natural products could be explored as potential anti-diabetic drugs. Natural plants derived extracts and molecules like berberine, ginsenosides, curcumin, stevioside, gingerols, capsaicin, catechins, simple phenolic compounds, anthocyanins, resveratrol, genistein and hesperidin obtained from different species are used for curing diabetes and found to possess different action mechanisms. In this review, the importance of medicinal plants and their active constituents for anti-diabetic agents are described. The present study also emphasized the importance of diabetes control, reduction in its complications and use of the anti-diabetic agents. The detailed action mechanism of these extracts/compounds for their activities are also described. However, the anti-diabetic drugs from plant origin require scientific validation through animal and clinical studies to exploit in terms of modern commercial medicines.
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Affiliation(s)
- Arun K Jugran
- Garhwal Regional Centre, G. B. Pant National Institute of Himalayan Environment (NIHE), Srinagar, Uttarakhand, India
| | - Sandeep Rawat
- Sikkim Regional Centre, G. B. Pant National Institute of Himalayan Environment (NIHE), Gangtok, Sikkim, India
| | - Hari P Devkota
- Department of Instrumental Analysis, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Indra D Bhatt
- Center for Biodiversity Conservation and Management (CBCM), G. B. Pant National Institute of Himalayan Environment (NIHE), Kosi-Katarmal, Almora, Uttarakhand, India
| | - Ranbeer S Rawal
- Center for Biodiversity Conservation and Management (CBCM), G. B. Pant National Institute of Himalayan Environment (NIHE), Kosi-Katarmal, Almora, Uttarakhand, India
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Wang J, Zhao J, Yan Y, Liu D, Wang C, Wang H. Inhibition of glycosidase by ursolic acid: in vitro, in vivo and in silico study. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2020; 100:986-994. [PMID: 31650545 DOI: 10.1002/jsfa.10098] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 10/11/2019] [Accepted: 10/16/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Controlling the blood glucose level is an effective method to reduce type 2 diabetes and prevent diabetes-related complications. Ursolic acid is a plant extract that can reduce postprandial hyperglycemia effectively. This study aimed to explore the inhibitory effect and interaction mechanism of ursolic acid against α-amylase and α-glucosidase. RESULTS In this study, the effect of ursolic acid on glycosidase was studied in vitro, in vivo, and in silico. The half-maximal inhibitory concentration (IC50 ) of ursolic acid on α-amylase and α-glucosidase was 0.482 ± 0.12 mg mL-1 and 0.213 ± 0.042 mg mL-1 , respectively. The results of enzymatic kinetics showed that ursolic acid inhibited α-amylase and α-glucosidase activity in a non-competitive manner. The fluorescence spectrum showed that the combination of ursolic acid and glycosidase caused the intrinsic fluorescence quenching of glycosidase. The observation of starch granules revealed that the activity of α-amylase was inhibited and the hydrolysis of starch granules was prevented in the presence of ursolic acid. Molecular docking results showed that ursolic acid bound to the inactive site of α-amylase and α-glucosidase through the formation of ursolic acid-glucosidase complex. Ursolic acid interacted with α-amylase and α-glucosidase mainly through hydrogen bonding. The postprandial hypoglycemic effect of ursolic acid in C57BL/6J mice showed that the high concentration of ursolic acid could quickly reduce postprandial blood glucose level. CONCLUSION Ursolic acid can be considered as a natural ingredient in functional foods to control postprandial blood glucose levels and prevent diabetes by delaying the digestion of starch in foods. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Jing Wang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology (TUST), Tianjin, China
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing, China
| | - Jiang Zhao
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology (TUST), Tianjin, China
| | - Yong Yan
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology (TUST), Tianjin, China
| | - Dong Liu
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology (TUST), Tianjin, China
| | - Chengtao Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing, China
- Beijing Laboratory for Food Quality and Safety, Beijing Technology and Business University, Beijing, China
| | - Hao Wang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology (TUST), Tianjin, China
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU), Beijing, China
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Furman BL, Candasamy M, Bhattamisra SK, Veettil SK. Reduction of blood glucose by plant extracts and their use in the treatment of diabetes mellitus; discrepancies in effectiveness between animal and human studies. JOURNAL OF ETHNOPHARMACOLOGY 2020; 247:112264. [PMID: 31600561 DOI: 10.1016/j.jep.2019.112264] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 09/03/2019] [Accepted: 09/29/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The global problem of diabetes, together with the limited access of large numbers of patients to conventional antidiabetic medicines, continues to drive the search for new agents. Ancient Asian systems such as traditional Chinese medicine, Japanese Kampo medicine, and Indian Ayurvedic medicine, as well as African traditional medicine and many others have identified numerous plants reported anecdotally to treat diabetes; there are probably more than 800 such plants for which there is scientific evidence for their activity, mostly from studies using various models of diabetes in experimental animals. AIM OF THE REVIEW Rather than a comprehensive coverage of the literature, this article aims to identify discrepancies between findings in animal and human studies, and to highlight some of the problems in developing plant extract-based medicines that lower blood glucose in patients with diabetes, as well as to suggest potential ways forward. METHODS In addition to searching the 2018 PubMed literature using the terms 'extract AND blood glucose, a search of the whole literature was conducted using the terms 'plant extracts' AND 'blood glucose' AND 'diabetes' AND 'double blind' with 'clinical trials' as a filter. A third search using PubMed and Medline was undertaken for systematic reviews and meta-analyses investigating the effects of plant extracts on blood glucose/glycosylated haemoglobin in patients with relevant metabolic pathologies. FINDINGS Despite numerous animal studies demonstrating the effects of plant extracts on blood glucose, few randomised, double-blind, placebo-controlled trials have been conducted to confirm efficacy in treating humans with diabetes; there have been only a small number of systematic reviews with meta-analyses of clinical studies. Qualitative and quantitative discrepancies between animal and human clinical studies in some cases were marked; the factors contributing to this included variations in the products among different studies, the doses used, differences between animal models and the human disease, and the impact of concomitant therapy in patients, as well as differences in the duration of treatment, and the fact that treatment in animals may begin before or very soon after the induction of diabetes. CONCLUSION The potential afforded by natural products has not yet been realised in the context of treating diabetes mellitus. A systematic, coordinated, international effort is required to achieve the goal of providing anti-diabetic treatments derived from medicinal plants.
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Affiliation(s)
- Brian L Furman
- Strathclyde Institute of Pharmacy & Biomedical Sciences, 161, Cathedral Street Glasgow, G4 ORE, Scotland, UK.
| | - Mayuren Candasamy
- School of Pharmacy, International Medical University, Jalan Jalil Perkasa 19, Bukit Jalil, 57000, Kuala Lumpur, Malaysia.
| | - Subrat Kumar Bhattamisra
- School of Pharmacy, International Medical University, Jalan Jalil Perkasa 19, Bukit Jalil, 57000, Kuala Lumpur, Malaysia.
| | - Sajesh K Veettil
- School of Pharmacy, International Medical University, Jalan Jalil Perkasa 19, Bukit Jalil, 57000, Kuala Lumpur, Malaysia.
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Jiang L, Wang Z, Wang X, Wang S, Cao J, Liu Y. Exploring the inhibitory mechanism of piceatannol on α-glucosidase relevant to diabetes mellitus. RSC Adv 2020; 10:4529-4537. [PMID: 35495253 PMCID: PMC9049079 DOI: 10.1039/c9ra09028b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 01/08/2020] [Indexed: 11/25/2022] Open
Abstract
Due to their association with type 2 diabetes mellitus treatment, α-glucosidase inhibitors have attracted increasing attention of researchers. In this study, we systemically investigated the kinetics and inhibition mechanism of piceatannol on α-glucosidase. Enzyme kinetics analyses showed that piceatannol exhibited strong inhibition on α-glucosidase in a non-competitive manner. Spectroscopy analyses indicated that piceatannol could bind with α-glucosidase to form complexes via high affinity. Further, computational molecular dynamics and molecular docking studies validated that the binding of piceatannol was outside the catalytic site of α-glucosidase, which would induce conformational changes of α-glucosidase and block the entrance of substrate, causing declines in α-glucosidase activities. Our results provide useful information not only for the inhibition mechanism of piceatannol against α-glucosidase but also for a novel target site for developing novel α-glucosidase inhibitors as potential therapeutic agents in the treatment of type 2 diabetes mellitus. The non-competitive inhibition of piceatannol on α-glucosidase. A combination of dynamic and static process with one binding site. The involvement of hydrophobic interactions and hydrogen bonding. Dietary recommendations for diabetes or potential antidiabetic drug.![]()
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Affiliation(s)
- Lili Jiang
- School of Life and Pharmaceutical Sciences
- Dalian University of Technology
- Panjin 124221
- China
| | - Zhen Wang
- School of Life and Pharmaceutical Sciences
- Dalian University of Technology
- Panjin 124221
- China
| | - Xiaoyu Wang
- School of Life and Pharmaceutical Sciences
- Dalian University of Technology
- Panjin 124221
- China
| | - Shujuan Wang
- School of Life and Pharmaceutical Sciences
- Dalian University of Technology
- Panjin 124221
- China
| | - Jun Cao
- Department of Occupational and Environmental Health
- Dalian Medical University
- Dalian 116044
- China
| | - Yong Liu
- School of Life and Pharmaceutical Sciences
- Dalian University of Technology
- Panjin 124221
- China
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Interaction mechanism of carnosic acid against glycosidase (α-amylase and α-glucosidase). Int J Biol Macromol 2019; 138:846-853. [DOI: 10.1016/j.ijbiomac.2019.07.179] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 07/25/2019] [Accepted: 07/25/2019] [Indexed: 11/18/2022]
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Sintsova O, Gladkikh I, Kalinovskii A, Zelepuga E, Monastyrnaya M, Kim N, Shevchenko L, Peigneur S, Tytgat J, Kozlovskaya E, Leychenko E. Magnificamide, a β-Defensin-Like Peptide from the Mucus of the Sea Anemone Heteractis magnifica, Is a Strong Inhibitor of Mammalian α-Amylases. Mar Drugs 2019; 17:md17100542. [PMID: 31546678 PMCID: PMC6835510 DOI: 10.3390/md17100542] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 09/16/2019] [Accepted: 09/17/2019] [Indexed: 01/07/2023] Open
Abstract
Sea anemones’ venom is rich in peptides acting on different biological targets, mainly on cytoplasmic membranes and ion channels. These animals are also a source of pancreatic α-amylase inhibitors, which have the ability to control the glucose level in the blood and can be used for the treatment of prediabetes and type 2 diabetes mellitus. Recently we have isolated and characterized magnificamide (44 aa, 4770 Da), the major α-amylase inhibitor of the sea anemone Heteractis magnifica mucus, which shares 84% sequence identity with helianthamide from Stichodactyla helianthus. Herein, we report some features in the action of a recombinant analog of magnificamide. The recombinant peptide inhibits porcine pancreatic and human saliva α-amylases with Ki’s equal to 0.17 ± 0.06 nM and 7.7 ± 1.5 nM, respectively, and does not show antimicrobial or channel modulating activities. We have concluded that the main function of magnificamide is the inhibition of α-amylases; therefore, its functionally active recombinant analog is a promising agent for further studies as a potential drug candidate for the treatment of the type 2 diabetes mellitus.
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Affiliation(s)
- Oksana Sintsova
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159, Pr. 100 let Vladivostoku, Vladivostok 690022, Russia.
| | - Irina Gladkikh
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159, Pr. 100 let Vladivostoku, Vladivostok 690022, Russia.
| | - Aleksandr Kalinovskii
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159, Pr. 100 let Vladivostoku, Vladivostok 690022, Russia.
- School of Natural Sciences, Far Eastern Federal University, 8, Sukhanova St, Vladivostok 690090, Russia.
| | - Elena Zelepuga
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159, Pr. 100 let Vladivostoku, Vladivostok 690022, Russia.
| | - Margarita Monastyrnaya
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159, Pr. 100 let Vladivostoku, Vladivostok 690022, Russia.
| | - Natalia Kim
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159, Pr. 100 let Vladivostoku, Vladivostok 690022, Russia.
| | - Lyudmila Shevchenko
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159, Pr. 100 let Vladivostoku, Vladivostok 690022, Russia.
| | - Steve Peigneur
- Toxicology and Pharmacology, University of Leuven (KU Leuven), Campus Gasthuisberg, O&N2, Herestraat 49, P.O. Box 922, Leuven B-3000, Belgium.
| | - Jan Tytgat
- Toxicology and Pharmacology, University of Leuven (KU Leuven), Campus Gasthuisberg, O&N2, Herestraat 49, P.O. Box 922, Leuven B-3000, Belgium.
| | - Emma Kozlovskaya
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159, Pr. 100 let Vladivostoku, Vladivostok 690022, Russia.
| | - Elena Leychenko
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159, Pr. 100 let Vladivostoku, Vladivostok 690022, Russia.
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22
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Feng XM, Su XL. Anticancer effect of ursolic acid via mitochondria-dependent pathways. Oncol Lett 2019; 17:4761-4767. [PMID: 31186681 DOI: 10.3892/ol.2019.10171] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 02/01/2019] [Indexed: 01/03/2023] Open
Abstract
Ursolic acid is a plant-derived pentacyclic triterpenoid found in various medicinal herbs and fruits. It has generated clinical interest due to its anti-inflammatory, antioxidative, antiapoptotic and anticarcinogenic effects. An increasing amount of evidence supports the anticancer effect of ursolic acid in various cancer cells. One of the hallmarks of malignant transformation is metabolic reprogramming that sustains macromolecule synthesis, bioenergetic demand and tumor cell survival. Mitochondria are important regulators of tumorigenes is as well as a major site of the metabolic reactions that facilitate this reprogramming and adaption to cellular and environmental changes. The current review explored the close association between the anticancer effect of ursolic acid and the activation of mitochondrial-dependent signaling pathways.
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Affiliation(s)
- Xue-Min Feng
- Clinical Medical Research Center of The Affiliated Hospital, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010050, P.R. China
| | - Xiu-Lan Su
- Clinical Medical Research Center of The Affiliated Hospital, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010050, P.R. China
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23
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Staats S, Wagner AE, Lüersen K, Künstner A, Meyer T, Kahns AK, Derer S, Graspeuntner S, Rupp J, Busch H, Sina C, Ipharraguerre IR, Rimbach G. Dietary ursolic acid improves health span and life span in male Drosophila melanogaster. Biofactors 2019; 45:169-186. [PMID: 30496629 DOI: 10.1002/biof.1467] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 09/26/2018] [Indexed: 12/13/2022]
Abstract
The health and life span of Drosophila melanogaster are partly determined by intestinal barrier integrity, metabolic rate as well as stress response and the expression of longevity-associated genes, depending on genetic and dietary factors. Ursolic acid (UA) is a naturally occurring triterpenoid exhibiting potential antimicrobial, anti-inflammatory, and antiobesity activity and counteracting age-related deficits in muscle strength. In this study, UA was dietarily administered to w1118 D. melanogaster which significantly elongated the health and life span of males. Spargel (srl) is the Drosophila orthologue of mammalian peroxisome proliferator-activated receptor-gamma coactivator 1 α(PGC1α), an important regulator of energy homeostasis and mitochondrial function. Our results indicate that the health-promoting effect of UA, demonstrated by a significant increase in climbing activity, occurs via an upregulation of srl expression leading to a metabolic shift in the fly without reducing fecundity or gut integrity. Moreover, UA affected the flies' microbiota in a manner that contributed to life span extension. Srl expression and microbiota both seem to be affected by UA, as we determined by using srl-mutant and axenic flies. © 2018 BioFactors, 45(2):169-186, 2019.
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Affiliation(s)
- Stefanie Staats
- Institute of Human Nutrition and Food Science, University of Kiel, Kiel, Germany
| | - Anika E Wagner
- Institute of Nutritional Medicine, University of Lübeck, Lübeck, Germany
| | - Kai Lüersen
- Institute of Human Nutrition and Food Science, University of Kiel, Kiel, Germany
| | - Axel Künstner
- Group for Medical Systems Biology, Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany
- Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
| | - Timo Meyer
- Institute of Human Nutrition and Food Science, University of Kiel, Kiel, Germany
| | - Anna K Kahns
- Institute of Human Nutrition and Food Science, University of Kiel, Kiel, Germany
| | - Stefanie Derer
- Institute of Nutritional Medicine, University of Lübeck, Lübeck, Germany
| | - Simon Graspeuntner
- Department of Infectious Diseases and Microbiology, University of Lübeck, Lübeck, Germany
| | - Jan Rupp
- Department of Infectious Diseases and Microbiology, University of Lübeck, Lübeck, Germany
| | - Hauke Busch
- Group for Medical Systems Biology, Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany
- Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
| | - Christian Sina
- Institute of Nutritional Medicine, University of Lübeck, Lübeck, Germany
| | | | - Gerald Rimbach
- Institute of Human Nutrition and Food Science, University of Kiel, Kiel, Germany
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24
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Identification of Bioactive Compounds and Analysis of Inhibitory Potential of the Digestive Enzymes from Syzygium sp. Extracts. J CHEM-NY 2019. [DOI: 10.1155/2019/3410953] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Diabetes and obesity represent major public health problems worldwide. High cost of medicines and drug treatments propose the research for less expensive alternatives, such as enzymatic inhibitors present in medicinal plants from natural sources. An example of such medicinal plant is the jambolan Syzygium sp., which is referred to be hypoglycemic and efficient in weight loss. With this in mind, we identified the bioactive compounds from Syzygium sp. commercial teas and evaluated the inhibitory potential and the antioxidant activity of digestive enzymes from a simulated gastric fluid. Syzygium sp. samples showed low percentages of enzymatic inhibition at 1 : 200 dilution. Antioxidant activity was significant, although it was not expressive of the contents of total phenolic compounds, tannins, flavonoids, flavones, and alkaloids. Maldi-Tof spectroscopy suggested the presence of luteolin in Syzygium sp. samples. Molecular docking predicted that luteolin binds at the α-amylase catalytic site in a similar manner as acarbose, the carbohydrate inhibitor from the enzyme crystallographic structure. The phytochemical content and biological activity were distinct among samples from commercial teas. Thus, additional studies should be conducted to elucidate efficacy and safety of Syzygium sp. extracts, especially in vivo experiments. Syzygium sp. might be in the near future recommended as a medicinal plant in low cost diabetes and obesity treatments.
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25
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Mabhida SE, Dludla PV, Johnson R, Ndlovu M, Louw J, Opoku AR, Mosa RA. Protective effect of triterpenes against diabetes-induced β-cell damage: An overview of in vitro and in vivo studies. Pharmacol Res 2018; 137:179-192. [PMID: 30315968 DOI: 10.1016/j.phrs.2018.10.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 08/27/2018] [Accepted: 10/04/2018] [Indexed: 12/14/2022]
Abstract
Accumulative evidence shows that chronic hyperglycaemia is a major factor implicated in the development of pancreatic β-cell dysfunction in diabetic patients. Furthermore, most of these patients display impaired insulin signalling that is responsible for accelerated pancreatic β-cell damage. Indeed, prominent pathways involved in glucose metabolism such as phosphatidylinositol 3-kinase/ protein kinase B (PI3-K/AKT) and 5' AMP-activated protein kinase (AMPK) are impaired in an insulin resistant state. The impairment of this pathway is associated with over production of reactive oxygen species and pro-inflammatory factors that supersede pancreatic β-cell damage. Although several antidiabetic drugs can improve β-cell function by modulating key regulators such as PI3-K/AKT and AMPK, evidence of their β-cell regenerative and protective effect is scanty. As a result, there has been continued exploration of novel antidiabetic therapeutics with abundant antioxidant and antiinflammatory properties that are essential in protecting against β-cell damage. Such therapies include triterpenes, which have displayed robust effects to improve glycaemic tolerance, insulin secretion, and pancreatic β-cell function. This review summarises most relevant effects of various triterpenes on improving pancreatic β-cell function in both in vitro and in vivo experimental models. A special focus falls on studies reporting on the ameliorative properties of these compounds against insulin resistance, oxidative stress and inflammation, the well-known factors involved in hyperglycaemia associated tissue damage.
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Affiliation(s)
- Sihle E Mabhida
- Department of Biochemistry and Microbiology, University of Zululand, KwaDlangezwa, 3886, South Africa; Biomedical Research and Innovation Platform (BRIP), South African Medical Research Council, Tygerberg, 7505, South Africa.
| | - Phiwayinkosi V Dludla
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, 60121, Italy; Biomedical Research and Innovation Platform (BRIP), South African Medical Research Council, Tygerberg, 7505, South Africa
| | - Rabia Johnson
- Biomedical Research and Innovation Platform (BRIP), South African Medical Research Council, Tygerberg, 7505, South Africa; Division of Medical Physiology, Faculty of Health Sciences, Stellenbosch University, Tygerberg, Stellenbosch, South Africa
| | - Musawenkosi Ndlovu
- Department of Biochemistry and Microbiology, University of Zululand, KwaDlangezwa, 3886, South Africa
| | - Johan Louw
- Department of Biochemistry and Microbiology, University of Zululand, KwaDlangezwa, 3886, South Africa; Biomedical Research and Innovation Platform (BRIP), South African Medical Research Council, Tygerberg, 7505, South Africa
| | - Andy R Opoku
- Department of Biochemistry and Microbiology, University of Zululand, KwaDlangezwa, 3886, South Africa
| | - Rebamang A Mosa
- Department of Biochemistry and Microbiology, University of Zululand, KwaDlangezwa, 3886, South Africa
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26
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Franco RR, da Silva Carvalho D, de Moura FBR, Justino AB, Silva HCG, Peixoto LG, Espindola FS. Antioxidant and anti-glycation capacities of some medicinal plants and their potential inhibitory against digestive enzymes related to type 2 diabetes mellitus. JOURNAL OF ETHNOPHARMACOLOGY 2018; 215:140-146. [PMID: 29274842 DOI: 10.1016/j.jep.2017.12.032] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 12/13/2017] [Accepted: 12/20/2017] [Indexed: 06/07/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Plants preparations are used by traditional medicine in the treatment of various diseases, such as type-2 diabetes mellitus. Some medicinal plants are capable of controlling the complications of this metabolic disease at different levels, for example, providing antioxidant compounds that act against oxidative stress and protein glycation and others which are capable of inhibiting the catalysis of digestive enzymes and thus contribute to the reduction of hyperglycemia and hyperlipidemia. Our objective was to investigate the antioxidant and anti-glycation activities of some medicinal plants and their potential inhibitory against α-amylase, α-glucosidase and pancreatic lipase activities. MATERIAL AND METHODS Based on the ethnobotanical researches carried out by academic studies conducted at the Federal University of Uberlandia, ten plants traditionally used in the treatment of type-2 diabetes mellitus were selected. Ethanol (EtOH) and hexane (Hex) extracts of specific parts of these plants were used in enzymatic assays to evaluate their inhibitory potential against α-amylase, α-glucosidase and lipase, as well as their antioxidant (DPPH, ORAC and FRAP) and anti-glycation (BSA/fructose model) capacities. RESULTS The results indicate that EtOH extract of four of the ten analyzed plants exhibited more than 70% of antioxidant and anti-glycation capacities, and α-amylase and lipase inhibitory activities; no extract was able to inhibit more than 40% the α-glucosidase activity. The EtOH extracts of Bauhinia forficata and Syzygium. cumini inhibited α-amylase (IC50 8.17 ± 2.24 and 401.8 ± 14.7 μg/mL, respectively), whereas EtOH extracts of B. forficata, Chamomilla recutita and Echinodorus grandiflorus inhibited lipase (IC50 59.6 ± 10.8, 264.2 ± 87.2 and 115.8 ± 57.1 μg/mL, respectively). In addition, EtOH extracts of B. forficata, S. cumini, C. recutita and E. grandiflorus showed, respectively, higher antioxidant capacity (DPPH IC50 0.7 ± 0.1, 2.5 ± 0.2, 1.3 ± 0.2 and 35.3 ± 9.0 μg/mL) and anti-glycation activity (IC50 22.7 ± 4.4, 246.2 ± 81.7, 18.5 ± 2.8 and 339.0 ± 91.0 μg/mL). CONCLUSIONS EtOH extracts of four of the ten species popularly cited for treatment of type 2 diabetes mellitus have shown promising antioxidant and anti-glycation properties, as well as the ability to inhibit the digestive enzymes α-amylase and lipase. Thus, our results open new possibilities for further studies in order to evaluate the antidiabetic potential of these medicinal plants.
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Affiliation(s)
- Rodrigo Rodrigues Franco
- Institute of Biotechnology (IBTEC), Federal University of Uberlandia (UFU), Uberlandia, MG, Brazil
| | | | | | - Allisson Benatti Justino
- Institute of Biotechnology (IBTEC), Federal University of Uberlandia (UFU), Uberlandia, MG, Brazil
| | | | - Leonardo Gomes Peixoto
- Institute of Biotechnology (IBTEC), Federal University of Uberlandia (UFU), Uberlandia, MG, Brazil
| | - Foued Salmen Espindola
- Institute of Biotechnology (IBTEC), Federal University of Uberlandia (UFU), Uberlandia, MG, Brazil.
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27
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Ding H, Hu X, Xu X, Zhang G, Gong D. Inhibitory mechanism of two allosteric inhibitors, oleanolic acid and ursolic acid on α-glucosidase. Int J Biol Macromol 2018; 107:1844-1855. [PMID: 29030193 DOI: 10.1016/j.ijbiomac.2017.10.040] [Citation(s) in RCA: 91] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 09/19/2017] [Accepted: 10/09/2017] [Indexed: 11/28/2022]
Abstract
Glycemic control which can be efficaciously regulated by inhibiting α-glucosidase activity is an effective therapy for diabetes mellitus. This work is to investigate the kinetics and inhibition mechanism of oleanolic acid and ursolic acid on α-glucosidase. Oleanolic acid and ursolic acid exhibited potent inhibitory activities with IC50 values of (6.35±0.02)×10-6 and (1.69±0.03)×10-5molL-1 respectively in a reversible and non-competitive manner. Both of them binding to α-glucosidase induced the conformational change and intrinsic fluorescence quenching of α-glucosidase. The binding constants of oleanolic acid and ursolic acid with α-glucosidase at 298K were (2.04±0.02)×103 and (1.87±0.02)×103Lmol-1, respectively. Docking results showed that oleanolic acid and ursolic acid bound in different allosteric sites of cavity 2 and cavity 4 on α-glucosidase, respectively, which triggered allosteric regulation to perturb conformational dynamics of α-glucosidase, eventually leading to a decrease of catalytic activity of the enzyme. The substrate was not catalyzed by α-glucosidase to generate further products due to formation of a nonreactive ternary complex of oleanolic acid- or ursolic acid-α-glucosidase-substrate. The combination of oleanolic acid and ursolic acid displayed a significant synergistic inhibition on α-glucosidase.
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Affiliation(s)
- Huafang Ding
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
| | - Xing Hu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
| | - Ximing Xu
- Institute of Bioinformatics and Medical Engineering, School of Electrical and Info- rmation Engineering, Jiangsu University of Technology, Changzhou 213001, China
| | - Guowen Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
| | - Deming Gong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China; New Zealand Institute of Natural Medicine Research, 8 Ha Crescent, Auckland 2104, New Zealand
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28
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Dos Santos MM, Prestes AS, de Macedo GT, Ecker A, Barcelos RP, Boligon AA, Souza D, de Bem AF, da Rocha JBT, Barbosa NV. Syzygium cumini leaf extract inhibits LDL oxidation, but does not protect the liproprotein from glycation. JOURNAL OF ETHNOPHARMACOLOGY 2018; 210:69-79. [PMID: 28844679 DOI: 10.1016/j.jep.2017.08.033] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 08/22/2017] [Accepted: 08/24/2017] [Indexed: 06/07/2023]
Abstract
ETNOPHARMACOLOGICAL RELEVANCE Syzygium cumini (L.) Skeels is a plant widely used in folk medicine to treat diabetes mellitus (DM). The tea from its leaves is frequently used by diabetics for lowering hyperglycemia. There is a close relationship between DM and atherosclerosis, a chronic immuno-inflammatory disease, were the early stages encompass oxidative and glycative modifications in the structure of low density lipoprotein (LDL). AIM OF THIS STUDY To investigate the potential protective effects of aqueous-leaf extract from Syzygium cumini (S.cExt) against CuSO4-induced oxidation and methylglyoxal (MG)-induced glycation of human LDL in vitro. MATERIALS AND METHODS LDL oxidative changes were evaluated by measuring conjugated dienes (CD) formation, thiobarbituric acid reactive substances (TBARS) levels, quenching of tryptophan (Trp) fluorescence and structural modifications in LDL particle. In LDL glycated by MG (glyLDL), we determined the levels of fluorescent advanced glycation end products (AGEs) and mobility by agarose gel electrophoresis. RESULTS S.cExt blocked oxidative events induced by CuSO4 in human LDL, plasma and serum. Fourier transform infrared spectroscopy (FT-IR) revealed that specific regions of apoB100 were oxidized by CuSO4 in human LDL and that S.cExt reduced these oxidations. Unlike, the increased AGEs levels and eletrophoretic mobility observed in LDL MG-glycated were not modified by S.cExt. CONCLUSION The findings herein indicate that S.cExt could be tested in atherogenesis models as potential protective agent against LDL oxidation.
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Affiliation(s)
- Matheus M Dos Santos
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Alessandro S Prestes
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Gabriel T de Macedo
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Assis Ecker
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Rômulo P Barcelos
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil; Graduate Program in Bio-experimentation, University of Passo Fundo, Passo Fundo, RS, Brazil
| | - Aline A Boligon
- Department of Industrial Pharmacy, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Diego Souza
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Andreza F de Bem
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - João B T da Rocha
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Nilda V Barbosa
- Department of Biochemistry and Molecular Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil.
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