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Mbara KC, Fotsing MC, Ndinteh DT, Mbeb CN, Nwagwu CS, Khan R, Mokhetho KC, Baijnath H, Nlooto M, Mokhele S, Leonard CM, Tembu VJ, Tarirai C. Endoplasmic reticulum stress in pancreatic β-cell dysfunction: The potential therapeutic role of dietary flavonoids. CURRENT RESEARCH IN PHARMACOLOGY AND DRUG DISCOVERY 2024; 6:100184. [PMID: 38846008 PMCID: PMC11153890 DOI: 10.1016/j.crphar.2024.100184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 05/21/2024] [Accepted: 05/22/2024] [Indexed: 06/09/2024] Open
Abstract
Diabetes mellitus (DM) is a global health burden that is characterized by the loss or dysfunction of pancreatic β-cells. In pancreatic β-cells, endoplasmic reticulum (ER) stress is a fact of life that contributes to β-cell loss or dysfunction. Despite recent advances in research, the existing treatment approaches such as lifestyle modification and use of conventional therapeutics could not prevent the loss or dysfunction of pancreatic β-cells to abrogate the disease progression. Therefore, targeting ER stress and the consequent unfolded protein response (UPR) in pancreatic β-cells may be a potential therapeutic strategy for diabetes treatment. Dietary phytochemicals have therapeutic applications in human health owing to their broad spectrum of biochemical and pharmacological activities. Flavonoids, which are commonly obtained from fruits and vegetables worldwide, have shown promising prospects in alleviating ER stress. Dietary flavonoids including quercetin, kaempferol, myricetin, isorhamnetin, fisetin, icariin, apigenin, apigetrin, vitexin, baicalein, baicalin, nobiletin hesperidin, naringenin, epigallocatechin 3-O-gallate hesperidin (EGCG), tectorigenin, liquiritigenin, and acacetin have shown inhibitory effects on ER stress in pancreatic β-cells. Dietary flavonoids modulate ER stress signaling components, chaperone proteins, transcription factors, oxidative stress, autophagy, apoptosis, and inflammatory responses to exert their pharmacological effects on pancreatic β-cells ER stress. This review focuses on the role of dietary flavonoids as potential therapeutic adjuvants in preserving pancreatic β-cells from ER stress. Highlights of the underlying mechanisms of action are also presented as well as possible strategies for clinical translation in the management of DM.
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Affiliation(s)
- Kingsley C. Mbara
- Nanomedicines Manufacturing, Biopharmaceutics and Diagnostics Research Laboratory, Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Marthe C.D. Fotsing
- Drug Discovery and Smart Molecules Research Laboratory, Centre for Natural Products Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, 2028, South Africa
| | - Derek T. Ndinteh
- Drug Discovery and Smart Molecules Research Laboratory, Centre for Natural Products Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, 2028, South Africa
| | - Claudine N. Mbeb
- Nanomedicines Manufacturing, Biopharmaceutics and Diagnostics Research Laboratory, Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Chinekwu S. Nwagwu
- Drug Delivery and Nanomedicines Research Laboratory, Department of Pharmaceutics, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Rene Khan
- Discipline of Medical Biochemistry, School of Laboratory Medicine and Medical Science, University of KwaZulu-Natal, Durban, South Africa
| | - Kopang C. Mokhetho
- Nanomedicines Manufacturing, Biopharmaceutics and Diagnostics Research Laboratory, Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Himansu Baijnath
- Ward Herbarium, School of Life Sciences, University of KwaZulu-Natal, Durban, 4000, KwaZulu-Natal, South Africa
| | - Manimbulu Nlooto
- Department of Pharmaceutical Sciences, Healthcare Sciences, University of Limpopo, South Africa
| | - Shoeshoe Mokhele
- Department of Pharmaceutical Sciences, School of Pharmacy, Sefako Makgatho Health Sciences University, Pretoria, 0208, South Africa
| | - Carmen M. Leonard
- Nanomedicines Manufacturing, Biopharmaceutics and Diagnostics Research Laboratory, Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Vuyelwa J. Tembu
- Natural Products Chemistry Research Laboratory, Department of Chemistry, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Clemence Tarirai
- Nanomedicines Manufacturing, Biopharmaceutics and Diagnostics Research Laboratory, Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
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Nabil-Adam A, E. Elnosary M, L. Ashour M, M. Abd El-Moneam N, A. Shreadah M. Flavonoids Biosynthesis in Plants as a Defense Mechanism: Role and Function Concerning Pharmacodynamics and Pharmacokinetic Properties. FLAVONOID METABOLISM - RECENT ADVANCES AND APPLICATIONS IN CROP BREEDING 2023. [DOI: 10.5772/intechopen.108637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Flavonoids are a major class of secondary metabolites that comprises more than 6000 compounds that have been identified. They are biosynthesized via the phenylpropanoid metabolic pathway that involves groups of enzymes such as isomerases, hydroxylases, and reductases that greatly affect the determination of the flavonoid skeleton. For example, transferase enzymes responsible for the modification of sugar result in changes in the physiological activity of the flavonoids and changes in their physical properties, such as solubility, reactivity, and interaction with cellular target molecules, which affect their pharmacodynamics and pharmacokinetic properties. In addition, flavonoids have diverse biological activities such as antioxidants, anticancer, and antiviral in managing Alzheimer’s disease. However, most marine flavonoids are still incompletely discovered because marine flavonoid biosynthesis is produced and possesses unique substitutions that are not commonly found in terrestrial bioactive compounds. The current chapter will illustrate the importance of flavonoids’ role in metabolism and the main difference between marine and terrestrial flavonoids.
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The hypocholesterolemic effect of methanolic extract of Bassia muricata l. on hypercholesterolemic rats. SN APPLIED SCIENCES 2023. [DOI: 10.1007/s42452-023-05320-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023] Open
Abstract
AbstractHypercholesterolemia is correlated with cardiovascular diseases. The search for effective alternatives for lipid-lowering drugs is continuous. We investigated the hypocholesterolemic activity of Bassia muricata methanolic extract (BMME) in a model of hyperlipidemia. B. muricata was extracted with methanol. Male rats were randomly divided into six groups: normal control group (G1) was fed normal diet, negative control group (G2) was fed high cholesterol and fat diet (HCFD), positive control group (G3) was fed HCFD and treated with atorvastatin (20 mg/kg), a fourth, fifth and sixth groups (G4, G5, and G6) were fed HCFD and treated with 10, 30 and 100 mg/Kg of BMME, respectively. All rat groups received, for 4 weeks, the appropriate daily dose after initial two weeks of feeding normal diet or HCFD. Body weight, lipid profile, serum glucose, liver enzymes were measured weekly. HCFD caused an increased total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), and glucose, decreased triglycerides (TG) and high-density lipoprotein cholesterol (HDL-C), and blunted the normal gain of body weight. BMME doses restored the normal gain of body weight, caused significant decrease in serum TC, LDL-C, and increased HDL-C when compared to G2. 10 mg/kg and 30 mg/kg of BMME failed to induce any change in alkaline phosphatase whereas 100 mg/Kg of BMME caused a significant increase in alanine transaminase. 10 mg/kg and 30 mg/kg of BMME significantly decreased serum glucose whereas 100 mg/kg BMME significantly increased it. BMME had significant hypocholesterolemic effect and 100 mg/kg BMME increased alanine transaminase, TG and glucose in rats.
Graphical abstract
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Heidari H, Khalaj A, Khani S, Abdollahi M, Farahani H, Khani S. Hypoglycemic, hypolipidemic and hepatoprotective effects of Alpinia officinarum on nicotinamide/streptozotocin induced type II diabetic rats. Horm Mol Biol Clin Investig 2022; 43:289-296. [PMID: 35488439 DOI: 10.1515/hmbci-2021-0050] [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: 06/11/2021] [Accepted: 03/12/2022] [Indexed: 10/18/2022]
Abstract
OBJECTIVES Alpinia officinarum Hance, commonly known as lesser galangal, is a member of the ginger family (Zingiberaceae) traditionally used for many decades to treat inflammation, pain, stomach ache and cold. In the present study, the antidiabetic and hypolipidemic potentials of the hydroalcoholic extract of A. officinarum (AO) were investigated in the nicotinamide/streptozotocin induced type II diabetic rats. METHODS Male Wistar rats were divided into following six groups: Group I was normal control rats. Group II: normal diabetic control, Group III: Diabetic rats treated with glibenclamide (0.25 mg/kg), IV, V and VI: Diabetic rats treated with 100, 200 and 500 mg/kg AO hydroalcoholic extract by daily gavage for 28 days, respectively. At the end of treatment, biochemical analysis, histological study, phytochemical analysis and acute toxicity tests were carried out. RESULTS The results show significant reduction in blood glucose, serum lipid profiles, and liver enzyme levels in diabetic rats compared with diabetic control in AO treated group. CONCLUSIONS In conclusion, the present study demonstrated that AO extract had significant (p<0.05) antidiabetic and anti-hyperlipidemia effects in addition to hepatoprotective effect in type II diabetic rats.
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Affiliation(s)
- Hamid Heidari
- Cellular and Molecular Research Center, Qom University of Medical Sciences, Qom, Iran
| | - Azam Khalaj
- Cellular and Molecular Research Center, Qom University of Medical Sciences, Qom, Iran
| | - Sima Khani
- Department of Chemistry, University of Massachusetts Boston, Boston, MA, USA
| | - Maasoume Abdollahi
- Department of Anatomical Sciences, Medical Sciences Faculty, Tarbiat Modares University, Tehran, Iran
| | - Hamid Farahani
- Cellular and Molecular Research Center, Qom University of Medical Sciences, Qom, Iran
| | - Samira Khani
- Neuroscience Research Center, Qom University of Medical Sciences, Qom, Iran
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Latifi E, Mohammadpour AA, Fathi Hafshejani B, Nourani H. Ferula assa-foetida oleo gum resin ethanolic extract alleviated the pancreatic changes and antioxidant status in streptozotocin-induced diabetic rats: A biochemical, histopathological, and ultrastructural study. J Food Biochem 2022; 46:e14191. [PMID: 35474229 DOI: 10.1111/jfbc.14191] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 02/11/2022] [Accepted: 03/25/2022] [Indexed: 01/07/2023]
Abstract
The current research examines the effects of administration of 150 and 250 mg/kg body weight/day of ethanolic Ferula assa-foetida L. oleo gum resin extract (FAE) for 42 days in streptozotocin-induced diabetes in rats. On day 42, all rats were euthanized; HOMA-β, HOMA-IR, and QUICKI levels in pancreas were examined histopathologically and ultrastructurally . Low-dose FAE (150 mg/kg) treatment resulted in significant improvement in serum glucose, insulin and superoxide dismutase, glutathione, and catalase levels (p < .05). It also improved β-cell function, restored pancreatic β-cells, and reduced insulin resistance compared to the diabetic control rats. Necrotic and degenerative alterations in the islets, pyknotic β-cell nuclei, β-cell degranulation, reduced islet cellular density, and significant vacuolation were found in the islets of STZ-diabetic control group ratsby the histomorphological and ultrastructural examination. The pancreatic histomorphology of low dose of FAE-treated diabetic rats showed remarkable improvements in the islets, such as the β-cell number and the area of the pancreatic islets. PRACTICAL APPLICATIONS: The experiment revealed that Ferula assa-foetida L. may exert antihyperglycemic activity in STZ diabetes via β-cell regeneration and its high antioxidant capacity. This work elucidates the role of Ferula assa-foetida L. in diabetes management. Ferula assa-foetida L. gum extract improved the morphological changes of the diabetic pancreas and stimulated the regeneration of the β cells. The findings demonstrated positive results for the long-term cure of diabetes. Additionally, this study showed the potential of isolating nutraceuticals for the development of medications.
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Affiliation(s)
- Ebrahim Latifi
- Department of Basic Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Ahmad Ali Mohammadpour
- Department of Basic Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Behrooz Fathi Hafshejani
- Department of Basic Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Hosein Nourani
- Department of Pathobiology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
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A Comparative Study between Conventional and Advanced Extraction Techniques: Pharmaceutical and Cosmetic Properties of Plant Extracts. Molecules 2022; 27:molecules27072074. [PMID: 35408473 PMCID: PMC9000874 DOI: 10.3390/molecules27072074] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/05/2022] [Accepted: 03/07/2022] [Indexed: 12/04/2022] Open
Abstract
This study aimed to compare the influence of extraction methods on the pharmaceutical and cosmetic properties of medicinal and aromatic plants (MAPs). For this purpose, the dried plant materials were extracted using advanced (microwave (MAE), ultrasonic (UAE), and homogenizer (HAE) assisted extractions) and conventional techniques (maceration, percolation, decoction, infusion, and Soxhlet). The tyrosinase, elastase, α-amylase, butyryl, and acetylcholinesterase inhibition were tested by using L-3,4 dihydroxy-phenylalanine, N-Succinyl-Ala-Ala-p-nitroanilide, butyryl, and acetylcholine as respective substrates. Antioxidant activities were studied by ABTS, DPPH, and FRAP. In terms of extraction yield, advanced extraction techniques showed the highest values (MAE > UAE > HAE). Chemical profiles were dependent on the phenolic compounds tested, whereas the antioxidant activities were always higher, mainly in infusion and decoction as a conventional technique. In relation to the pharmaceutical and cosmetic properties, the highest inhibitory activities against α-amylase and acetylcholinesterase were observed for Soxhlet and macerated extracts, whereas the highest activity against tyrosinase was obtained with MAE > maceration > Soxhlet. Elastase and butyrylcholinesterase inhibitory activities were in the order of Soxhlet > maceration > percolation, with no activities recorded for the other tested methods. In conclusion, advanced methods afford an extract with high yield, while conventional methods might be an adequate approach for minimal changes in the biological properties of the extract.
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Papuc C, Goran GV, Predescu CN, Tudoreanu L, Ștefan G. Plant polyphenols mechanisms of action on insulin resistance and against the loss of pancreatic beta cells. Crit Rev Food Sci Nutr 2022; 62:325-352. [PMID: 32901517 DOI: 10.1080/10408398.2020.1815644] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Diabetes mellitus describes a group of metabolic disorders characterized by a prolonged period hyperglycemia with long-lasting detrimental effects on the cardiovascular and nervous systems, kidney, vision, and immunity. Many plant polyphenols are shown to have beneficial activity for the prevention and treatment of diabetes, by different mechanisms. This review article is focused on synthesizing the mechanisms by which polyphenols decrease insulin resistance and inhibit loss of pancreatic islet β-cell mass and function. To achieve the objectives, this review summarizes the results of the researches realized in recent years in clinical trials and in various experimental models, on the effects of foods rich in polyphenols, polyphenolic extracts, and commercially polyphenols on insulin resistance and β-cells death. Dietary polyphenols are able to reduce insulin resistance alleviating the IRS-1/PI3-k/Akt signaling pathway, and to reduce the loss of pancreatic islet β-cell mass and function by several molecular mechanisms, such as protection of the surviving machinery of cells against the oxidative insult; increasing insulin secretion in pancreatic β-cells through activation of the FFAR1; cytoprotective effect on β-cells by activation of autophagy; protection of β-cells to act as activators for anti-apoptotic pathways and inhibitors for apoptotic pathway; stimulating of insulin release, presumably by transient ATP-sensitive K+ channel inhibition and whole-cell Ca2+ stimulation; involvement in insulin release that act on ionic currents and membrane potential as inhibitor of delayed-rectifier K+ current (IK(DR)) and activator of current. dietary polyphenols could be used as potential anti-diabetic agents to prevent and alleviate diabetes and its complications, but further studies are needed.
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Affiliation(s)
- Camelia Papuc
- Faculty of Veterinary Medicine, UASVM of Bucharest, Bucharest, Romania
| | - Gheorghe V Goran
- Faculty of Veterinary Medicine, UASVM of Bucharest, Bucharest, Romania
| | - Corina N Predescu
- Faculty of Veterinary Medicine, UASVM of Bucharest, Bucharest, Romania
| | - Liliana Tudoreanu
- Faculty of Veterinary Medicine, UASVM of Bucharest, Bucharest, Romania
| | - Georgeta Ștefan
- Faculty of Veterinary Medicine, UASVM of Bucharest, Bucharest, Romania
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Ahangarpour A, Oroojan AA. Myricitrin and Its Solid Lipid Nanoparticle Increase Insulin Secretion and Content of Isolated Islets from the Pancreas of Male Mice. BRAZ J PHARM SCI 2022. [DOI: 10.1590/s2175-97902022e20065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Akram Ahangarpour
- Ahvaz Jundishapur University of Medical Sciences, Iran; Ahvaz Jundishapur University of Medical Science, Iran
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Ojo OO, Olorunsogo OO. Quercetin and vitamin E attenuate diabetes-induced testicular anomaly in Wistar rats via the mitochondrial-mediated apoptotic pathway. Andrologia 2021; 53:e14185. [PMID: 34275146 DOI: 10.1111/and.14185] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 06/18/2021] [Accepted: 06/19/2021] [Indexed: 11/27/2022] Open
Abstract
The role of quercetin and vitamin E treatment against streptozotocin (STZ)-induced testicular abnormalities in diabetic rats and the possible mechanism of action they use for protection were investigated. Diabetes was induced by STZ (45 mg/kg i.p. once) and blood glucose was determined. Plasmatic insulin, testosterone, luteinising hormone and follicle-stimulating hormone (FSH) were determined by ELISA. Levels of cytochrome c, caspase 3 and caspase 9 were evaluated by immunohistochemistry, while lesions were viewed by histology. Insulin played a role in testicular protection against male infertility through modulation of luteinising hormone (LH). This consequently increased Leydig and Sertoli cells and maturation of germ cells with the attached epididymis having abundant spermatozoa. The study showed a positive correlation in the levels of LH, FSH and testosterone; it was further established that all treatments normalised diabetes-induced alterations. Treatment with quercetin and vitamin E resulted in 34% decrease of apoptogenic cytochrome c release. This protected the testes against excessive apoptosis by decreasing caspase 3 and caspase 9 activation by up to 30 and 28% respectively (p < .05). Histology also showed that treatment prevented testicular cell death. The findings show that quercetin/vitamin E possess free radical scavenging properties that protected against testicular damage in diabetes. This suggests the possibility of pharmaco-therapeutic intervention.
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Affiliation(s)
- Oluwatoyin Osinimega Ojo
- Laboratories for Biomembrane Research and Biotechnology, Department of Biochemistry, College of Medicine, University of Ibadan, Ibadan, Nigeria.,Department of Chemical Sciences, Faculty of Natural and Applied Sciences, Anchor University Lagos, Lagos, Nigeria
| | - Olufunso Olabode Olorunsogo
- Laboratories for Biomembrane Research and Biotechnology, Department of Biochemistry, College of Medicine, University of Ibadan, Ibadan, Nigeria
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Behradnasab M, Matinhomaei H, Rasaei MJ. Synergistic effects of high-intensity interval training (HIIT) and intake of nettle on serum levels of chemerin and beta cells function in type 2 diabetic rats. JOURNAL OF COMPLEMENTARY & INTEGRATIVE MEDICINE 2021; 19:305-310. [PMID: 34463439 DOI: 10.1515/jcim-2021-0103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 06/11/2021] [Indexed: 11/15/2022]
Abstract
OBJECTIVES This animal study aimed to demonstrate the synergistic effect of high-intensity interval training (HIIT) and alcoholic extract of nettle on serum chemerin and beta cells function in type 2 diabetic male rats. METHODS Thirty-two STZ-induced diabetic male Wistar rats were randomly divided into four groups including the control group, the supplemented group with 200 mg/day of nettle, the training group with five sessions per week of HIIT, and the group with combined nettle and HITT intervention. Body weight, lipid profile, beta cells function, and chemerin level were assessed after eight weeks of the intervention. RESULTS The values of chemerin significantly decreased in combined HIIT and nettle intervention group compared to the control group (p=0.001). The levels of glucose and insulin decreased significantly in nettle group, exercise group, and combined HIIT and nettle group (p=0.001). CONCLUSIONS The present study found that intense interval exercise with the consumption of alcoholic extract of nettle can affect the performance of beta cells, glucose, and insulin. Future human studies are warranted.
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Affiliation(s)
- Mojgan Behradnasab
- Department of Physical Education & Sport Sciences, Faculty of Sport Science, Islamic Azad University, Tehran, Iran
| | - Hassan Matinhomaei
- Department of Physical Education & Sport Sciences, Faculty of Sport Science, Islamic Azad University, Tehran, Iran
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Al Duhaidahawi D, Hasan SA, Al Zubaidy HFS. Flavonoids in the Treatment of Diabetes: Clinical Outcomes and Mechanism to Ameliorate Blood Glucose Levels. Curr Diabetes Rev 2021; 17:e120720188794. [PMID: 33290200 DOI: 10.2174/1573399817666201207200346] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 09/25/2020] [Accepted: 10/08/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND For thousands of years, natural food products have been used as a medicine for treating diseases that affect the human body, including diabetes mellitus (DM). Lately, several investigations have been performed on the flavonoid derivatives of plant origin, and their biological activity has been extensively studied. METHODS Given our need to know more mechanisms for treating DM, we performed a thorough research review on treating diabetes mellitus based on flavonoids, their therapeutic potential, and biological action. RESULTS Flavonoids reduce complications in addition to their vital role as effective supplements for preventing diabetes mellitus by regulating glucose metabolism, lipid profile, liver enzyme activity, a protein kinase inhibitor, PPAR, and AMPK with NF-κB. CONCLUSION The articles that we reviewed showed the positive role of flavonoids, which in a certain way reduce diabetes, but their side effects still need to be studied further.This review is focused on describing the different types of dietary flavonoids along with their mechanisms of reducing blood glucose and enhancing insulin sensitivity, as well as their side effects.
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Affiliation(s)
- Dunya Al Duhaidahawi
- Faculty of Pharmacy, Department of Pharmacognacy, University of Kufa, AL-Najaf, Iraq
| | - Samer A Hasan
- Pharmacognacy, Pharmacy, University of Kufa, AL-Najaf, Iraq
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Skoko S, Ambrosetti M, Giovannini T, Cappelli C. Simulating Absorption Spectra of Flavonoids in Aqueous Solution: A Polarizable QM/MM Study. Molecules 2020; 25:E5853. [PMID: 33322361 PMCID: PMC7764712 DOI: 10.3390/molecules25245853] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 12/04/2020] [Accepted: 12/07/2020] [Indexed: 11/16/2022] Open
Abstract
We present a detailed computational study of the UV/Vis spectra of four relevant flavonoids in aqueous solution, namely luteolin, kaempferol, quercetin, and myricetin. The absorption spectra are simulated by exploiting a fully polarizable quantum mechanical (QM)/molecular mechanics (MM) model, based on the fluctuating charge (FQ) force field. Such a model is coupled with configurational sampling obtained by performing classical molecular dynamics (MD) simulations. The calculated QM/FQ spectra are compared with the experiments. We show that an accurate reproduction of the UV/Vis spectra of the selected flavonoids can be obtained by appropriately taking into account the role of configurational sampling, polarization, and hydrogen bonding interactions.
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Affiliation(s)
- Sulejman Skoko
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy; (S.S.); (M.A.)
| | - Matteo Ambrosetti
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy; (S.S.); (M.A.)
| | - Tommaso Giovannini
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway;
| | - Chiara Cappelli
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy; (S.S.); (M.A.)
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Hameed A, Raza SA, Israr Khan M, Baral J, Adhikari A, Nur-E-Alam M, Ahmed S, Al-Rehaily AJ, Ashraf S, Ul-Haq Z, Hafizur RM. Tambulin from Zanthoxylum armatum acutely potentiates the glucose-induced insulin secretion via K ATP-independent Ca 2+-dependent amplifying pathway. Biomed Pharmacother 2019; 120:109348. [PMID: 31629954 DOI: 10.1016/j.biopha.2019.109348] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 07/30/2019] [Accepted: 08/07/2019] [Indexed: 12/30/2022] Open
Abstract
Tambulin, a flavonol isolated from Zanthoxylum armatum, showed potent insulin secretory activity in our preliminary anti-diabetic screening. Here, we explored the insulin secretory mechanism(s) of tambulin focusing in glucose-dependent, KATP ‒ and Ca2+‒channels dependent, and cAMP-PKA pathways. Mice islets and MIN6 cells were incubated with tambulin in the presence of pharmacological agonists/antagonists and the secreted insulin was measured using mouse insulin ELISA kit. The intracellular cAMP was measured by an acetylation cAMP ELISA kit. Tambulin (200 μM) showed potent insulin secretory activity only at stimulatory glucose (11-25 mM) concentrations; however, no change in insulin release was observed at basal glucose both in mice islets and MIN6 cells. Notably, in the presence of diazoxide, a KATP channel opener; the incomplete inhibition of tambulin-induced insulin secretion was observed whereas, complete inhibition was found using verapamil, an L-type Ca2+ channel blocker. Furthermore, the insulinotropic potential of tambulin was amplified in tolbutamide treated, and depolarized islets suggest tambulin's target other than tolbutamide. Tambulin showed no additive effect in the IBMX-induced intracellular cAMP; whereas, exerted an additive effect in the IBMX-induced insulin secretion. Furthermore, tambulin-induced insulin secretion was dramatically inhibited by PKA inhibitor (H-89), while moderate inhibition was found by using PKC inhibitor (calphostin C). Molecular docking studies also showed the best binding affinities of tambulin with PKA suggest the PKA dependent signaling cascade is involved more in tambulin-induced insulin secretion. Based on these findings, it is concluded that tambulin stimulates insulin secretion in a Ca2+ channel-dependent but KATP channel-independent manner, most likely by activating the cAMP-PKA pathway.
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Affiliation(s)
- Abdul Hameed
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan; Centre for Advanced Drug Research (CADR), COMSATS University Islamabad (CUI), Abbottabad 22060, Pakistan
| | - Sayed Ali Raza
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - M Israr Khan
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Janaki Baral
- Central Department of Chemistry, Tribhuvan University, Kathmandu, Nepal
| | - Achyut Adhikari
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan; Central Department of Chemistry, Tribhuvan University, Kathmandu, Nepal
| | - Mohammad Nur-E-Alam
- Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. Box. 2457, Riyadh 11451, Saudi Arabia
| | - Sarfaraz Ahmed
- Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. Box. 2457, Riyadh 11451, Saudi Arabia
| | - Adnan J Al-Rehaily
- Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. Box. 2457, Riyadh 11451, Saudi Arabia
| | - Sajda Ashraf
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan; H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Zaheer Ul-Haq
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan; H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Rahman M Hafizur
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan.
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14
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Harun Al Rashid M, Majumder S, Mandal V, Mandal SC, Thandavarayan RA. In search of suitable extraction technique for large scale commercial production of bioactive fraction for the treatment of diabetes: The case Diospyros melanoxylon Roxb. J Tradit Complement Med 2019; 9:106-118. [PMID: 30963045 PMCID: PMC6435958 DOI: 10.1016/j.jtcme.2017.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 11/16/2017] [Accepted: 11/20/2017] [Indexed: 11/20/2022] Open
Abstract
Diospyros melanoxylon Roxb. (D. melanoxylon) belongs to the family Ebenaceae and its leaves are very well known for making beedi throughout the World. The current study estimated the comparative extraction technique and its in-vitro antidiabetic prospective of the leaves of D. melanoxylon. Qualitative phytochemicals analysis of the samples from D. melanoxylon was carried out for the detection of secondary metabolites. Total phenolics, flavonoids, triterpenoids and tannins content of D. melanoxylon were estimated using colorimetric assay. Microwave-assisted extraction (MAE) technique with a low carbon output was observed for the speedy extraction of bioactive compounds obtained from Diospyros melanoxylon leaf extract. MAE produced a maximum yield of bioactive compounds which was found to be more efficient than ultrasound, soxhlet and maceration extraction. Qualitative HPLC analysis was performed for bioactive compounds. The in-vitro antidiabetic assay was performed using α-amylase and α-glucosidase inhibitory activity. In conclusion, the fractions exhibited the concentration-dependent inhibitory effect with significant (P < 0.0001) result. So the above performance might be accountable for the antidiabetic activity of D. Melanoxylon leaf extract due to presence of bioactive compounds.
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Affiliation(s)
- Md. Harun Al Rashid
- Pharmacognosy and Phytotherapy Research Laboratory, Division of Pharmacognosy, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India
| | - Sayani Majumder
- Pharmacognosy and Phytotherapy Research Laboratory, Division of Pharmacognosy, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India
| | - Vivekananda Mandal
- Institute of Pharmacy, Guru Ghasidas Central University, Bilaspur 495009, India
| | - Subhash C. Mandal
- Pharmacognosy and Phytotherapy Research Laboratory, Division of Pharmacognosy, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India
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15
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Rey D, Miranda Sulis P, Alves Fernandes T, Gonçalves R, Silva Frederico MJ, Costa GM, Aragon M, Ospina LF, Mena Barreto Silva FR. Astragalin augments basal calcium influx and insulin secretion in rat pancreatic islets. Cell Calcium 2019; 80:56-62. [PMID: 30965223 DOI: 10.1016/j.ceca.2019.03.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 03/18/2019] [Accepted: 03/27/2019] [Indexed: 12/13/2022]
Abstract
Astragalin is a flavonol glycoside with several biological activities, including antidiabetic properties. The objective of this study was to investigate the effects of astragalin on glycaemia and insulin secretion, in vivo, and on calcium influx and insulin secretion in isolated rat pancreatic islets, ex vivo. Astragalin (1 and 10 mg / kg) was administered by oral gavage to fasted Wistar rats and serum glucose and plasma insulin were measured. Isolated pancreatic islets were used to measure basal insulin secretion and calcium influx. Astragalin (10 mg/ kg) decreased glycaemia and increased insulin secretion significantly at 15-180 min, respectively, in the glucose tolerance test. In isolated pancreatic cells, astragalin (100 μM) stimulated calcium influx through a mechanism involving ATP-dependent potassium channels, L-type voltage-dependent calcium channels, the sarcoendoplasmic reticulum calcium transport ATPase (SERCA), PKC and PKA. These findings highlight the dietary coadjuvant, astragalin, as a potential insulin secretagogue that may contribute to glucose homeostasis.
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Affiliation(s)
- Diana Rey
- Universidad Nacional de Colombia, Departamento de Farmácia, Facultad de Ciencias, Cra. 30 No. 45-03, Postal Code 111321, Bogotá, D. C., Colombia; Universidade Federal de Santa Catarina, Departamento de Bioquímica - Centro de Ciências Biológicas, Campus Universitário, BairroTrindade, Cx. Postal 5069, CEP: 88040-970, Florianópolis, SC, Brazil
| | - Paola Miranda Sulis
- Universidade Federal de Santa Catarina, Departamento de Bioquímica - Centro de Ciências Biológicas, Campus Universitário, BairroTrindade, Cx. Postal 5069, CEP: 88040-970, Florianópolis, SC, Brazil
| | - Thaís Alves Fernandes
- Universidade Federal de Santa Catarina, Departamento de Bioquímica - Centro de Ciências Biológicas, Campus Universitário, BairroTrindade, Cx. Postal 5069, CEP: 88040-970, Florianópolis, SC, Brazil
| | - Renata Gonçalves
- Universidade Federal de Santa Catarina, Departamento de Bioquímica - Centro de Ciências Biológicas, Campus Universitário, BairroTrindade, Cx. Postal 5069, CEP: 88040-970, Florianópolis, SC, Brazil
| | - Marisa Jádna Silva Frederico
- Universidade Federal de Santa Catarina, Departamento de Bioquímica - Centro de Ciências Biológicas, Campus Universitário, BairroTrindade, Cx. Postal 5069, CEP: 88040-970, Florianópolis, SC, Brazil
| | - Geison M Costa
- Pontificia Universidad Javeriana, Departamento de Química, Facultad de Ciencias, Carrera 7 No. 43-82, Edificio Carlos Ortiz (52), Oficina 617, Postal Code 110231, Bogotá, D. C., Colombia
| | - Marcela Aragon
- Universidad Nacional de Colombia, Departamento de Farmácia, Facultad de Ciencias, Cra. 30 No. 45-03, Postal Code 111321, Bogotá, D. C., Colombia
| | - Luís Fernando Ospina
- Universidad Nacional de Colombia, Departamento de Farmácia, Facultad de Ciencias, Cra. 30 No. 45-03, Postal Code 111321, Bogotá, D. C., Colombia
| | - Fátima Regina Mena Barreto Silva
- Universidade Federal de Santa Catarina, Departamento de Bioquímica - Centro de Ciências Biológicas, Campus Universitário, BairroTrindade, Cx. Postal 5069, CEP: 88040-970, Florianópolis, SC, Brazil.
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16
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Hasan M, Panda BP. Chemometric analysis of selective polyphenolic groups in Asparagus racemosus (Shatavar) root extracts by traditional and supercritical fluid (CO2) based extractions. SEP SCI TECHNOL 2019. [DOI: 10.1080/01496395.2019.1594896] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Mojeer Hasan
- Microbial and Pharmaceutical Biotechnology Laboratory, Department of Pharmacognosy and Phytochemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, India
| | - Bibhu Prasad Panda
- Microbial and Pharmaceutical Biotechnology Laboratory, Department of Pharmacognosy and Phytochemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, India
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17
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In Vitro Investigation of Potential Anti-Diabetic Activity of the Corm Extract of Hypoxis Argentea Harv. Ex Baker. ACTA PHARMACEUTICA (ZAGREB, CROATIA) 2018; 68:389-407. [PMID: 31259706 DOI: 10.2478/acph-2018-0023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 02/27/2018] [Indexed: 12/12/2022]
Abstract
The corms of Hypoxis argentea are widely used as a traditional remedy for diabetes mellitus in South Africa. In this study, we investigated the effects of non-toxic concentrations (12.5-100 μg mL-1) of the aqueous extract of H. argentea (HAA) corms on glucose uptake, pancreatic beta cell proliferation, and adipocyte differentiation. HAA stimulated glucose uptake in HepG2 cells up to 19.6 % and 17.0 % in L6 myotubes. Live-cell imaging microscopy revealed significant increases (p < 0.001) in total INS-1 cell numbers exposed to HAA, although no effect was observed on adipogenesis in 3T3-L1 pre-adipocytes. HAA produced weak to moderate inhibition of porcine pancreatic α-amylase, α-glucosidase, porcine pancreatic lipase, dipeptidyl peptidase IV (DPP IV) activities, as well as protein glycation. Our results suggest that the acclaimed anti-diabetic effects of H. argentea could be mediated by its promotion of glucose utilization and preservation of pancreatic beta cell populations while preventing fat accumulation in adipocytes.
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18
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Riahi L, Chakroun H, Klay I, Masmoudi AS, Cherif A, Zoghlami N. Metabolomic fingerprint of Mentha rotundifolia L. Leaf tissues promotes this species as a potential candidate for sustainable production of biologically active molecules. JOURNAL OF COMPLEMENTARY & INTEGRATIVE MEDICINE 2018; 16:/j/jcim.ahead-of-print/jcim-2018-0048/jcim-2018-0048.xml. [PMID: 30335609 DOI: 10.1515/jcim-2018-0048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 07/17/2018] [Indexed: 11/15/2022]
Abstract
Background The Mentha rotundifolia L. (Lamiaceae family), is a medicinal herb used since the ancient times as an antiseptic, analgesic and anti-inflammatory agent. In the present work, metabolomic profiling of two Mentha rotundifolia L. ecotypes leaf tissues spontaneously growing in the North of Tunisia was achieved. Methods Phenolic contents (TPC, TFC and TTC) were assessed using colorimetric methods. Metabolomic profiling of leaf tissues extracts was assessed based on Gas Chromatography-Mass Spectrometry (GC/MS) analysis. The antioxidant ability of M. rotundifolia extracts was achieved based on two test systems namely DPPH and FRAP assays. Antimicrobial activity against a set of Gram negative and Gram positive bacteria was estimated by measuring ID, MIC and MBC values. Results Fifty metabolites were identified as belonging mainly to phenolics, fatty acids, terpenes, steroids and aldehydes classes with qualitative and quantitative variability. Most of the identified compounds are reputed bioactive with potent antioxidant, antimicrobial and anti-inflammatory among others effects. To confirm these findings common in vitro biological activities were achieved. The investigated extracts showed significant antioxidant abilities based on both 1,1-diphenyl-2-picrylhydrazyl (DPPH) and Ferric reducing antioxidant potential (FRAP) assays. Furthermore, the extracts revealed promising antimicrobial ability against tested Gram+ and Gram- bacterial strains (ID: 12.5-14.5 mm, MIC: 3.125-25 (µg/mL), MBC: 6.25-100 (µg/mL)). Conclusions Based on our findings Mentha rotundifolia L. leaves extracts present a potential source of natural antioxidants and diverse bioactive compounds which could be used in green pharmacy, food preservation, alternative medicine and natural therapies.
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Affiliation(s)
- Leila Riahi
- Laboratory of Biotechnology and Bio-Geo Resources Valorization BVBGR-LR11ES31, Higher Institute of Biotechnology of Sidi Thabet, University of Manouba, 2020, Sidi Thabet, Ariana, Tunisia.,Laboratory of Plant Molecular Physiology, Centre of Biotechnology of Borj Cedria, B.P. 901, Hammam-Lif 2050, Tunisia
| | - Hanen Chakroun
- Biology Department, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
| | - Imen Klay
- Laboratory of Biotechnology and Bio-Geo Resources Valorization BVBGR-LR11ES31, Higher Institute of Biotechnology of Sidi Thabet, University of Manouba, 2020, Sidi Thabet, Ariana, Tunisia
| | - Ahmed Slaheddine Masmoudi
- Laboratory of Biotechnology and Bio-Geo Resources Valorization BVBGR-LR11ES31, Higher Institute of Biotechnology of Sidi Thabet, University of Manouba, 2020, Sidi Thabet, Ariana, Tunisia
| | - Ameur Cherif
- Laboratory of Biotechnology and Bio-Geo Resources Valorization BVBGR-LR11ES31, Higher Institute of Biotechnology of Sidi Thabet, University of Manouba, 2020, Sidi Thabet, Ariana, Tunisia
| | - Nejia Zoghlami
- Laboratory of Plant Molecular Physiology, Centre of Biotechnology of Borj Cedria, B.P. 901, Hammam-Lif 2050, Tunisia
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19
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Chen H, Xiong L, Wang N, Liu X, Hu W, Yang Z, Jiang Y, Zheng G, Ouyang K, Wang W. Chimonanthus nitens Oliv. leaf extract exerting anti-hyperglycemic activity by modulating GLUT4 and GLUT1 in the skeletal muscle of a diabetic mouse model. Food Funct 2018; 9:4959-4967. [PMID: 30182103 DOI: 10.1039/c8fo00954f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The present study aimed to explore the potent molecular mechanisms behind the hypoglycemic effect of Chimonanthus nitens Oliv. leaf extract (COE) in combination with a high-glucose-fat diet-fed and streptozotocin-induced diabetic mouse model. COE (50 and 200 mg per kg body weight per day) was given to the diabetic-model mice by intragastric administration for 4 weeks. It was found that the fasting blood glucose level (FBG), serum insulin level (FINS), and insulin sensitivity index (ISI) were significantly improved in the COE-treated diabetic-model mice. Glucose metabolism genes expression analysis of the skeletal muscle showed that COE exerted a glucose-lowering effect through the following two ways: on the one hand, COE enhanced insulin sensitivity by upregulating the transcription level of GLUT4, and in addition, it enhanced the insulin signaling pathway to promote the translocation of GLUT4 and upregulated thermogenesis genes expression, including PGC-1α and UCP-1; while on the other hand, GLUT1 expression was also increased in both the transcription and translation levels in the presence of COE. These two ways may result in promoting glucose uptake in skeletal muscle, thus leading to the reduction of the blood glucose level. The results suggested that COE ameliorated hyperglycemia in the diabetic-model mice through regulating glucose transporters, and then was likely to increase glucose uptake, which provided more evidence for applying COE to treat anti-hyperglycemia.
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Affiliation(s)
- Hui Chen
- Key Lab for Agro-product Processing and Quality Control of Nanchang City, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China.
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20
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Widhiantara IG, Arunngam P, Milas Siswanto F. Ethanolic Extract of Caesalpinia bonducella f. Seed Ameliorates Diabetes Phenotype of Streptozotocin- Nicotinamide-Induced Type 2 Diabetes Rat. ACTA ACUST UNITED AC 2018. [DOI: 10.13005/bpj/1473] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Caesalpinia bonducella F. (Leguminosae) is widely used medicinal plant which contains flavonoid, tannin, saponin, and a potent antioxidant activity. However, the antihyperglycemic effect of the seed of C. bonducella is remained to be evaluated. This study used 24 male Wistar albino rats that were induced for type 2 diabetes with streptozotocin (STZ) and nicotinamide (NA). The rats were divided into three groups: the distilled water-treated group (NC group), glibenclamide-treated group (10 mg/kg/d, oral; PC group), and C. bonducella seed extract-treated group (500 mg/kg/d, oral; T group). Blood glucose and plasma insulin measurements were done after 14 days of treatment. The results showed that the postprandial blood glucose (PPBG) level of both PC and T groups were decreased significantly (p < 0.01 for both), whereas in NC group, the PPBG level was rising (p < 0.01). Glibenclamide was found to be more effective to decrease the PPBG level than C. bonducella seed extract (p < 0.01). The post-test fasting insulin level of T group was higher than other groups (p < 0.05). In summary, our results suggest that ethanolic extract of C. bonducella seed possesses antidiabetic activity against experimentally-induced type 2 diabetes.
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Affiliation(s)
- I. Gede Widhiantara
- Department of Biology, Faculty of Health, Science and Technology, Dhyana Pura University, Badung, Indonesia
| | - Pakajiraporn Arunngam
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, Sanda, Japan
| | - Ferbian Milas Siswanto
- Department of Biology, Faculty of Health, Science and Technology, Dhyana Pura University, Badung, Indonesia
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21
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Ren G, Rimando AM, Mathews ST. AMPK activation by pterostilbene contributes to suppression of hepatic gluconeogenic gene expression and glucose production in H4IIE cells. Biochem Biophys Res Commun 2018. [PMID: 29524400 DOI: 10.1016/j.bbrc.2018.03.035] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Pterostilbene, a bioactive component of blueberries and grapes, shows structural similarity to resveratrol, and exhibits antioxidant, anti-inflammatory, anti-cancer, hypoglycemic, and cholesterol lowering effects. Recent evidence indicates that pterostilbene is an agonist of the nuclear receptor, peroxisome proliferator-activated receptor-alpha (PPAR-α). Since PPAR-α agonists induce peroxisomal proliferation and fatty acid oxidation, we examined gene expression of acyl CoA oxidase (ACO) and carnitine palmitoyl transferase-1 (CPT-1). Pterostilbene treatment, at concentrations that demonstrated over 75% cell viability (20 μM, 50 μM), significantly increased gene expression of ACO, CPT-1, and PPAR-α. Pterostilbene treatment (50 μM) also demonstrated potent activation of AMP-activated kinase (AMPK), compared to AICAR (0.5 mM) or metformin (2 mM), consistent with upregulation in fatty acid oxidation gene expression. Since AMPK activators mimic the actions of insulin by repressing hepatic gluconeogenesis, we examined pterostilbene's effects on hepatic gluconeogenic gene expression. Pterostilbene treatment significantly repressed dexamethasone-induced phosphoenol pyruvate carboxykinase (PEPCK) and glucose6-phosphatase (G6Pase) gene expression, and decreased glucose production in H4IIE cells. Taken together, our studies demonstrate that pterostilbene, a natural compound and PPAR-α agonist, modulate several AMPK-dependent metabolic functions. The results of the present study suggest that pterostilbene may have beneficial effects in the prevention and management of type 2 diabetes and related disorders. In this study, we found that pterostilbene activated AMP-activated kinase (AMPK) and increased the expression of fatty acid oxidation genes, including acyl CoA oxidase and carnitine palmitoyl transferase-1.
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Affiliation(s)
- Guang Ren
- Department of Nutrition and Dietetics, Boshell Diabetes and Metabolic Diseases Research Program, Auburn University, AL 36849, USA
| | - Agnes M Rimando
- U.S. Department of Agriculture, Agricultural Research Service, Natural Products Utilization Research Unit, P.O. Box 8048, University, MS 38677, USA
| | - Suresh T Mathews
- Department of Nutrition and Dietetics, Boshell Diabetes and Metabolic Diseases Research Program, Auburn University, AL 36849, USA.
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Chen H, Xiong L, Wang N, Liu X, Hu W, Yang Z, Jiang Y, Zheng G, Ouyang K, Wang W. Chimonanthus nitens Oliv. leaf extract exerting anti-hyperglycemic activity by modulating GLUT4 and GLUT1 in the skeletal muscle of a diabetic mouse model. Food Funct 2018. [DOI: https://doi.org/10.1039/c8fo00954f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
COE supplementation ameliorated hyperglycemia via modulating glucose transporters of the skeletal muscle.
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23
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Agung Alit Suka Astini DA, Gunawan HA, Wirono Aman Santoso RM, Andajani S, Basori A. THE EFFECT OF SOURSOP LEAF EXTRACT ON PANCREATIC BETA CELL COUNT AND FASTING BLOOD GLUCOSE IN MALE WISTAR RATS EXPOSED TO A HIGH-FAT DIET AND STREPTOZOTOCIN. FOLIA MEDICA INDONESIANA 2017. [DOI: 10.20473/fmi.v53i1.5484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Based on some researches known that soursop leaf extract can improve beta cell injury. The aims of this study was to analyze the effect of soursop leaf extract on fasting blood glucose (FBG) and pancreatic beta cell number in male Wistar rats wich were exposed to a high-fat diet and streptozotocin. This study design is the only randomized posttest control group design. The total sample size is 50 male Wistar rats. The independent variable: high-fat diet, STZ, and soursop leaf extract; the dependent variable: pancreatic beta cells number, and FBG3. Data tested for normality with Kolmogorov-Smirnov (a=0.05) and tested of homogeneity with Levene (a =0.05). Comparison test between groups with Kruskal-Wallis (a=0.05), followed by Mann Whitney. Correlation test with Pearson (a=0.05) between dose of the soursop leaf extract and FBG3, and between dose and the number of pancreatic beta cells. The results of this study showed that the soursop leaf extract at a dose of 100 mg/kg and 150 mg/kg have an effect on fasting blood glucose levels and panreatic beta cells number;2)There is a significant negative correlation between the orograstric lavage of soursop leaf extract with FBG3 (r=-0.647;p<0.001), the increasing doses of soursop leaf extract, further lowering fasting blood glucose levels;3)There is a significant positive correlation between the orograstric lavage of soursop leaf extract with the number of pancreatic beta cells (r=0,759;p<0,001), the increasing doses of soursop leaf extract, further increasing pancreatic beta cells number. In conclusion, increasing doses of soursop leaf extract, further lowering fasting blood glucose and increasing the number of pancreatic beta cells.
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Abbasi Oshaghi E, Goodarzi MT, Higgins V, Adeli K. Role of resveratrol in the management of insulin resistance and related conditions: Mechanism of action. Crit Rev Clin Lab Sci 2017; 54:267-293. [DOI: 10.1080/10408363.2017.1343274] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Ebrahim Abbasi Oshaghi
- Department of Clinical Biochemistry, School of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mohammad Taghi Goodarzi
- Department of Clinical Biochemistry, School of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Victoria Higgins
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Khosrow Adeli
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
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25
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Yang K, Chan CB. Proposed mechanisms of the effects of proanthocyanidins on glucose homeostasis. Nutr Rev 2017; 75:642-657. [DOI: 10.1093/nutrit/nux028] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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26
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Muller CJF, Malherbe CJ, Chellan N, Yagasaki K, Miura Y, Joubert E. Potential of rooibos, its major C-glucosyl flavonoids, and Z-2-(β-D-glucopyranosyloxy)-3-phenylpropenoic acid in prevention of metabolic syndrome. Crit Rev Food Sci Nutr 2017; 58:227-246. [PMID: 27305453 DOI: 10.1080/10408398.2016.1157568] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Risk factors of type 2 diabetes mellitus (T2D) and cardiovascular disease (CVD) cluster together and are termed the metabolic syndrome. Key factors driving the metabolic syndrome are inflammation, oxidative stress, insulin resistance (IR), and obesity. IR is defined as the impairment of insulin to achieve its physiological effects, resulting in glucose and lipid metabolic dysfunction in tissues such as muscle, fat, kidney, liver, and pancreatic β-cells. The potential of rooibos extract and its major C-glucosyl flavonoids, in particular aspalathin, a C-glucoside dihydrochalcone, as well as the phenolic precursor, Z-2-(β-D-glucopyranosyloxy)-3-phenylpropenoic acid, to prevent the metabolic syndrome, will be highlighted. The mechanisms whereby these phenolic compounds elicit positive effects on inflammation, cellular oxidative stress and transcription factors that regulate the expression of genes involved in glucose and lipid metabolism will be discussed in terms of their potential in ameliorating features of the metabolic syndrome and the development of serious metabolic disease. An overview of the phenolic composition of rooibos and the changes during processing will provide relevant background on this herbal tea, while a discussion of the bioavailability of the major rooibos C-glucosyl flavonoids will give insight into a key aspect of the bioefficacy of rooibos.
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Affiliation(s)
- Christo J F Muller
- a Biomedical Research and Innovation Platform , South African Medical Research Council , Tygerberg , South Africa
| | - Christiaan J Malherbe
- b Post-Harvest and Wine Technology Division , Agricultural Research Council (ARC), Infruitec-Nietvoorbij , Stellenbosch , South Africa
| | - Nireshni Chellan
- a Biomedical Research and Innovation Platform , South African Medical Research Council , Tygerberg , South Africa
| | - Kazumi Yagasaki
- c Division of Applied Biological Chemistry , Institute of Agriculture, Tokyo University of Agriculture and Technology , Fuchu , Tokyo , Japan.,d Center for Bioscience Research and Education , Utsunomiya University , Utsunomiya , Tochigi , Japan
| | - Yutaka Miura
- c Division of Applied Biological Chemistry , Institute of Agriculture, Tokyo University of Agriculture and Technology , Fuchu , Tokyo , Japan
| | - Elizabeth Joubert
- b Post-Harvest and Wine Technology Division , Agricultural Research Council (ARC), Infruitec-Nietvoorbij , Stellenbosch , South Africa.,e Department of Food Science , Stellenbosch University, Private Bag X1, Matieland Stellenbosch , South Africa
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27
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Zhao P, Alam MB, Lee SH, Kim YJ, Lee S, An H, Choi HJ, Son HU, Park CH, Kim HH, Lee SH. Spatholobus suberectus Exhibits Antidiabetic Activity In Vitro and In Vivo through Activation of AKT-AMPK Pathway. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2017; 2017:6091923. [PMID: 28607575 PMCID: PMC5451887 DOI: 10.1155/2017/6091923] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 04/24/2017] [Indexed: 11/25/2022]
Abstract
Glucose deposition in peripheral tissue is an important parameter for the treatment of type 2 diabetes mellitus. The aim of this study was to investigate the effects of Spatholobus suberectus (Ss) on glucose disposal in skeletal muscle cells and additionally explore its in vivo antidiabetic potential. Treatment of ethanolic extract of S. suberectus (EeSs) significantly enhanced the glucose uptake, mediated through the enhanced expression of GLUT4 in skeletal muscle via the stimulation of AKT and AMPK pathways in C2C12 cells. Moreover, EeSs have potential inhibitory action on α-glucosidase activity and significantly lowered the postprandial blood glucose levels in STZ-induced diabetic mice, associated with increased expression of GLUT4 and AKT and/or AMPK-mediated signaling cascade in skeletal muscle. Furthermore, administration of EeSs significantly boosted up the antioxidant enzyme expression and also mitigated the gluconeogenesis enzyme such as PEPCK and G-6-Pase enzyme expression in liver tissue of STZ-induced diabetic mice model. Collectively, these findings suggest that EeSs have a high potentiality to mitigate diabetic symptoms through stimulating glucose uptake in peripheral tissue via the activation of AKT and AMPK signaling cascade and augmenting antioxidant potentiality as well as blocking the gluconeogenesis process in diabetic mice.
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Affiliation(s)
- Peijun Zhao
- Department of Food Science and Biotechnology, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Md Badrul Alam
- Department of Food Science and Biotechnology, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Seok-hyun Lee
- Department of Food Science and Biotechnology, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Young-Jun Kim
- Department of Food Science and Biotechnology, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Seul Lee
- Department of Food Science and Biotechnology, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Hongyan An
- Department of Food Science and Biotechnology, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Hee-Jeong Choi
- Department of Food Science and Biotechnology, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Hyeong-U Son
- Department of Food Science and Biotechnology, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
- Food and Bio-Industry Research Institute, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Chul-Hong Park
- Department of Biomedical Sciences, University of North Dakota, Grand Forks, ND 58202-9037, USA
| | - Hyo-Hyun Kim
- MR Innovation Co., Ltd., Technopark, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Sang-Han Lee
- Department of Food Science and Biotechnology, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
- Food and Bio-Industry Research Institute, Kyungpook National University, Daegu 41566, Republic of Korea
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Norouzzadeh M, Amiri F, Saboor-Yaraghi AA, Shemirani F, Kalikias Y, Sharifi L, Seyyedsalehi MS, Mahmoudi M. Does Resveratrol Improve Insulin Signalling in HepG2 Cells? Can J Diabetes 2017; 41:211-216. [DOI: 10.1016/j.jcjd.2016.09.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Revised: 09/05/2016] [Accepted: 09/28/2016] [Indexed: 12/16/2022]
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Loizzo MR, Bonesi M, Menichini F, Tenuta MC, Leporini M, Tundis R. Antioxidant and Carbohydrate-Hydrolysing Enzymes Potential of Sechium edule (Jacq.) Swartz (Cucurbitaceae) Peel, Leaves and Pulp Fresh and Processed. PLANT FOODS FOR HUMAN NUTRITION 2016; 71:381-387. [PMID: 27474037 DOI: 10.1007/s11130-016-0571-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
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30
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Mousavi L, Salleh RM, Murugaiyah V, Asmawi MZ. Hypoglycemic and anti-hyperglycemic study of Ocimum tenuiflorum L. leaves extract in normal and streptozotocin-induced diabetic rats. Asian Pac J Trop Biomed 2016. [DOI: 10.1016/j.apjtb.2016.10.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Kamau LN, Mbaabu MP, Mbaria JM, Karuri GP, Kiama SG. Knowledge and demand for medicinal plants used in the treatment and management of diabetes in Nyeri County, Kenya. JOURNAL OF ETHNOPHARMACOLOGY 2016; 189:218-229. [PMID: 27180316 DOI: 10.1016/j.jep.2016.05.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 05/07/2016] [Accepted: 05/09/2016] [Indexed: 06/05/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Non communicable diseases are currently a major health challenge facing humanity. Nyeri County has one of the highest diabetes prevalence in Kenya (12.6%), compared to the country's prevalence of 5.6%. The purpose of the study was to document; diabetes knowledge, medicinal plants and demand for the services of traditional medicine practitioners, in the management and treatment of diabetes. METHODS A cross-sectional study was carried out in the six constituencies in Nyeri, using pre-tested semi-structured questionnaires. Thirty practicing traditional medicine practitioners were purposively selected for the study. Field observation and identification was carried out on all plants that were cited during the interview. Plant samples were collected and voucher specimen deposited in the University of Nairobi Herbarium in the - School of Biological Sciences. RESULTS The study revealed 30 plant species in 28 genera and 23 families that are used by the traditional medicine practitioners to treat and manage diabetes. Demand for traditional medicine practitioners' services in the treatment of diabetes is low and often occurs when conventional drugs fail. CONCLUSION Interaction with the TMPs unveiled significant diversity of potential anti diabetic medicinal plants and in-depth ethnobotanical knowledge that they possessed. Preference for traditional herbal medicine was low despite wide ethnobotanical knowledge in the face of high prevalence of diabetes in the locality. The findings form the basis of pharmacological studies for standardization of the documented ethnomedicine used in the treatment and management of diabetes in the study area.
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Affiliation(s)
- Loice N Kamau
- Department of Veterinary Anatomy and Physiology, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya.
| | - Mathiu P Mbaabu
- Department of Veterinary Anatomy and Physiology, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya.
| | - James M Mbaria
- Department of Public Health, Pharmacology and Toxicology, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya.
| | - Gathumbi P Karuri
- Department of Veterinary Pathology, Microbiology and Parasitology, University of Nairobi, P.O. Box 29053-00625 Nairobi, Kenya.
| | - Stephen G Kiama
- Department of Veterinary Anatomy and Physiology, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya.
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Arumugam B, Palanisamy UD, Chua KH, Kuppusamy UR. Potential antihyperglycaemic effect of myricetin derivatives from Syzygium malaccense. J Funct Foods 2016. [DOI: 10.1016/j.jff.2016.01.038] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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Johnson MH, de Mejia EG. Phenolic Compounds from Fermented Berry Beverages Modulated Gene and Protein Expression To Increase Insulin Secretion from Pancreatic β-Cells in Vitro. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:2569-2581. [PMID: 26967923 DOI: 10.1021/acs.jafc.6b00239] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Berries are a rich source of bioactive phenolic compounds that are able to bind and inhibit the enzyme dipeptidyl peptidase-IV (DPP-IV), a current target for type-2 diabetes therapy. The objectives were to determine the role of berry phenolic compounds to modulate incretin-cleaving DPP-IV and its substrate glucagon-like peptide-1 (GLP-1), insulin secretion from pancreatic β-cells, and genes and proteins involved in the insulin secretion pathway using cell culture. Anthocyanins (ANC) from 50% blueberry-50% blackberry (Blu-Bla) and 100% blackberry (Bla) fermented beverages at 50 μM cyanidin-3-glucoside equivalents increased (p < 0.05) glucose-stimulated insulin secretion from pancreatic β-cells (iNS-1E) both when applied directly and following simulated absorption through Caco-2 cells (by 233 and 100 μIU insulin/mL, respectively). ANC 50%Blu-Bla and ANC 100%Bla upregulated the gene for incretin hormone GLP-1 (fold-change 3.0 ± 1.4 and 2.0 ± 0.3, respectively) and genes in the insulin secretory pathway including insulin-like growth factor 1 receptor (iGF1R, 2.3 ± 0.6 and 1.6 ± 0.3, respectively), and increased (p < 0.05) the protein expression of insulin-like growth factor 2 (IGF-II), insulin-like growth factor binding proteins (IGFBP-2 and 3), and vascular endothelial growth factor (VEGF) in iNS-1E cells. Taken together, anthocyanins, predominantly delphinidin-3-arabinoside, from fermented berry beverages have the potential to modulate DPP-IV and its substrate GLP-1, to increase insulin secretion, and to upregulate expression of mRNA of insulin-receptor associated genes and proteins in pancreatic β-cells.
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Affiliation(s)
- Michelle H Johnson
- Division of Nutritional Sciences and ‡Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Elvira Gonzalez de Mejia
- Division of Nutritional Sciences and ‡Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
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Santiago-Torres M, Kratz M, Lampe JW, Tapsoba JDD, Breymeyer KL, Levy L, Villaseñor A, Wang CY, Song X, Neuhouser ML. Metabolic responses to a traditional Mexican diet compared with a commonly consumed US diet in women of Mexican descent: a randomized crossover feeding trial. Am J Clin Nutr 2016; 103:366-74. [PMID: 26718418 PMCID: PMC4733259 DOI: 10.3945/ajcn.115.119016] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 11/12/2015] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Mexican immigrants are disproportionally affected by diet-related risk of metabolic dysfunction. Whether adhering to a traditional Mexican diet or adopting a US diet contributes to metabolic changes associated with future risk of type 2 diabetes and other chronic diseases has not been investigated. OBJECTIVE The purpose of this study was to test in a randomized crossover feeding trial the metabolic responses to a Mexican diet compared with a commonly consumed US diet. DESIGN First- and second-generation healthy women of Mexican descent (n = 53) were randomly assigned in a crossover design to consume a Mexican or US diet for 24 d each, separated by a 28-d washout period. Diets were eucaloric and similar in macronutrient composition. The metabolic responses to diets were assessed by measuring fasting serum concentrations of glucose, insulin, insulin-like growth factor 1 (IGF-1), insulin-like growth factor binding protein 3 (IGFBP-3), adiponectin, C-reactive protein (CRP), and interleukin 6 (IL-6), as well as the homeostasis model assessment of insulin resistance (HOMA-IR) at the beginning and end of each period. Linear mixed models tested the intervention effect on the biomarkers, while adjusting for diet sequence, feeding period, baseline and washout biomarker concentrations, age, acculturation, and BMI. RESULTS Compared with the US diet, the Mexican diet reduced insulin by 14% [geometric means (95% CIs): 9.3 (8.3, 10.3) compared with 8.0 (7.2, 8.9) μU/mL; P = 0.02], HOMA-IR by 15% [2.0 (1.8, 2.3) compared with 1.7 (1.6, 2.0); P = 0.02], and IGFBP-3 by 6% (mean ± SEM: 2420 ± 29 compared with 2299 ± 29 ng/mL; P < 0.01) and tended to reduce circulating concentrations of IGF-1 by 4% (149 ± 2.6 compared with 144 ± 2.5 ng/mL; P = 0.06). There was no significant intervention effect on serum concentrations of glucose, adiponectin, CRP, or IL-6 in the US compared with the Mexican diet. CONCLUSION Compared with the commonly consumed US diet, the traditional Mexican diet modestly improved insulin sensitivity under conditions of weight stability in healthy women of Mexican descent, while having no impact on biomarkers of inflammation. This trial was registered at clinicaltrials.gov as NCT01369173.
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Affiliation(s)
| | - Mario Kratz
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA; and
| | - Johanna W Lampe
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA; and
| | - Jean De Dieu Tapsoba
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA; and
| | - Kara L Breymeyer
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA; and
| | - Lisa Levy
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA; and
| | - Adriana Villaseñor
- Department of Family Medicine and Public Health, University of California, San Diego, La Jolla, CA
| | - Ching-Yun Wang
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA; and
| | - Xiaoling Song
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA; and
| | - Marian L Neuhouser
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA; and
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White bread enriched with polyphenol extracts shows no effect on glycemic response or satiety, yet may increase postprandial insulin economy in healthy participants. Nutr Res 2015; 36:193-200. [PMID: 26612114 DOI: 10.1016/j.nutres.2015.10.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 09/18/2015] [Accepted: 10/21/2015] [Indexed: 11/23/2022]
Abstract
Extracts from different plant sources have been shown to modify starch digestion from carbohydrate-rich foods and lower resulting glycemia. It was hypothesized that extracts rich in polyphenols, added to white bread, would improve the glycemic response and insulin response and increase satiety in healthy participants. An in vitro dose-response analysis was performed to determine the optimal dose of a variety of extracts (baobab fruit extract, green tea extract, grape seed extract, and resveratrol) for reducing rapidly digestible starch in white bread. The 2 extracts with the greatest sugar reducing potential were then used for the human study in which 13 volunteers (9 female and 4 male) were recruited for a crossover trial of 3 different meals. On separate days, participants consumed a control white bread, white bread with green tea extract (0.4%), and white bread with baobab fruit extract (1.88%). Glycemic response, insulin response, and satiety were measured 3 hours postprandially. Although enriched breads did not reduce glycemic response or hunger, white bread with added baobab fruit extract significantly (P < .05) reduced the total (0-180 minutes) and segmental insulin area under the curve at 0 to 90, 0 to 120, and 0 to 150 minutes, and therefore reduced the amount of insulin needed for a given blood glucose response. This preliminary research suggests that there is potential for baobab fruit extract added into white bread to improve insulin economy in healthy adults.
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Guo X, Sha X, Liu J, Cai S, Wang Y, Ji B. Chinese Purple Yam (<i>Dioscorea alata</i> L.) Extracts Inhibit Diabetes-Related Enzymes and Protect HepG2 Cells Against Oxidative Stress and Insulin Resistance Induced by FFA. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2015. [DOI: 10.3136/fstr.21.677] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- XiaoXuan Guo
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science and Nutritional Engineering, China Agricultural University
| | - XiaoHong Sha
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science and Nutritional Engineering, China Agricultural University
| | - Jia Liu
- China National Research Institute of Food and Fermentation Industries
| | - ShengBao Cai
- Yunnan Institute of Food Safety, Kunming University of Science and Technology
| | - Yong Wang
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science and Nutritional Engineering, China Agricultural University
| | - BaoPing Ji
- Beijing Key Laboratory of Functional Food from Plant Resources, College of Food Science and Nutritional Engineering, China Agricultural University
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González-Abuín N, Martínez-Micaelo N, Blay M, Ardévol A, Pinent M. Grape-seed procyanidins prevent the cafeteria-diet-induced decrease of glucagon-like peptide-1 production. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:1066-1072. [PMID: 24410268 DOI: 10.1021/jf405239p] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Grape-seed procyanidin extract (GSPE) has been reported to improve insulin resistance in cafeteria rats. Because glucagon-like peptide-1 (GLP-1) is involved in glucose homeostasis, the preventive effects of GSPE on GLP-1 production, secretion, and elimination were evaluated in a model of diet-induced insulin resistance. Rats were fed a cafeteria diet for 12 weeks, and 25 mg of GSPE/kg of body weight was administered concomitantly. Vehicle-treated cafeteria-fed rats and chow-fed rats were used as controls. The cafeteria diet decreased active GLP-1 plasma levels, which is attributed to a decreased intestinal GLP-1 production, linked to reduced colonic enteroendocrine cell populations. Such effects were prevented by GSPE. In the same context, GSPE avoided the decrease on intestinal dipeptidyl-peptidase 4 (DPP4) activity and modulated the gene expression of GLP-1 and its receptor in the hypothalamus. In conclusion, the preventive treatment with GSPE abrogates the effects of the cafeteria diet on intestinal GLP-1 production and DPP4 activity.
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Affiliation(s)
- Noemi González-Abuín
- Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili , 43007 Tarragona, Spain
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Grape seed procyanidins improve β-cell functionality under lipotoxic conditions due to their lipid-lowering effect. J Nutr Biochem 2013; 24:948-53. [DOI: 10.1016/j.jnutbio.2012.06.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Revised: 04/04/2012] [Accepted: 06/15/2012] [Indexed: 11/20/2022]
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Orhan N, Aslan M, Süküroğlu M, Deliorman Orhan D. In vivo and in vitro antidiabetic effect of Cistus laurifolius L. and detection of major phenolic compounds by UPLC-TOF-MS analysis. JOURNAL OF ETHNOPHARMACOLOGY 2013; 146:859-865. [PMID: 23462413 DOI: 10.1016/j.jep.2013.02.016] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 01/24/2013] [Accepted: 02/06/2013] [Indexed: 06/01/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE In Turkish folk medicine, various parts of Cistus laurifolius L. are used to treat gastric ulcer and various types of pains. Additionally the tea prepared from the leaves is used to decrease symptoms of diabetes. MATERIALS AND METHODS In the present study, the hypoglycemic effects of aqueous and ethanol extracts of Cistus laurifolius were investigated in normal, glucose loaded hyperglycemic and streptozocin (STZ)-induced diabetic rats. α-Glucosidase and α-amylase enzyme inhibitory effects were determined to evaluate the mechanism of action. Total phenolic content of the extracts were determined by using Folin-Ciocalteu reagent and Ultra Performance Liquid Chromatography-Time of Flight Mass Spectrometer (UPLC-TOF-MS) was used to detect the major phenolic compounds in the extract. RESULTS Results indicated that blood glucose levels of the STZ-induced diabetic rats were decreased by ethanol extract at of 250 and 500mg/kg doses as compared to control group (16%-34%). In glucose loaded animals, extracts have shown a weak hypoglycemic effect (11%-20%). Additionally, the ethanol extract of Cistus laurifolius is found to be a potent inhibitor of α-glucosidase and α-amylase, possibly due to several polyphenolic compounds present within the extract. Twelve major flavonoids (apigenin, quercetin, kaempferol, naringenin, quercitrin and their derivatives), gallic, ellagic and chlorogenic acid in chromatographic fingerprint were analyzed by the on-line UPLC-TOF-MS system. CONCLUSIONS Due to having inhibitory effect on blood glucose level and carbohydrate digesting enzymes (α-glucosidase and α-amylase), Cistus laurifolius leaves might be beneficial for diabetic patients.
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Affiliation(s)
- Nilüfer Orhan
- Department of Pharmacognosy, Faculty of Pharmacy, Gazi University, Ankara 06330, Turkey
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The role of calcium in intracellular pathways of rutin in rat pancreatic islets: potential insulin secretagogue effect. Eur J Pharmacol 2013; 702:264-8. [PMID: 23399767 DOI: 10.1016/j.ejphar.2013.01.055] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Revised: 01/21/2013] [Accepted: 01/31/2013] [Indexed: 01/31/2023]
Abstract
Rutin is a flavonol glycoside with multiple biological activities and it has been demonstrated that rutin modulates glucose homeostasis. In pancreatic β-cell, an increase in intracellular calcium concentration triggers exocytosis and thus insulin secretion. The aim of the study reported herein was to investigate the effect of rutin associated intracellular pathways on Ca(2+) uptake in isolated rat pancreatic islets. We focused on the acute effects of rutin on in vivo insulin secretion and the in vitro cellular signaling of pancreatic islets related to this effect. The results show that rutin significantly increased glucose-induced insulin secretion in an in vivo treatment. Moreover, it was demonstrated that rutin stimulated Ca(2+) uptake after 10 min of incubation compared with the respective control group. The involvement of L-type voltage-dependent Ca(2+) channels (L-VDCCs) was evidenced using nifedipine, while the use of glibenclamide and diazoxide demonstrated that the ATP-sensitive potassium (KATP) channels are not involved in the rutin action in pancreatic islets. In conclusion, rutin diminish glycemia, potentiate insulin secretion in vivo and significantly stimulates Ca(2+) uptake in rat pancreatic islets. A novel cellular mechanism of action of rutin in Ca(2+) uptake on pancreatic β-cells was elucidated. Rutin modulates Ca(2+) uptake in pancreatic islets by opening L-VDCCs, alter intracellular Ca(2+), PLC and PKC signaling pathways, characterizing KATP channel-independent pathways. These findings highlight rutin, a dietary adjuvant, as a potential insulin secretagogue contributing to glucose homeostasis.
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Manickam D, Periyasamy L. Antidiabetic effect of methanolic extract of Decalepis hamiltonii root (wight and Arn) in normal and alloxan induced diabetic rats. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.jopr.2012.11.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Kang C, Lee H, Jung ES, Seyedian R, Jo M, Kim J, Kim JS, Kim E. Saffron (Crocus sativus L.) increases glucose uptake and insulin sensitivity in muscle cells via multipathway mechanisms. Food Chem 2012; 135:2350-8. [DOI: 10.1016/j.foodchem.2012.06.092] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Revised: 05/13/2012] [Accepted: 06/25/2012] [Indexed: 10/28/2022]
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43
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Cedó L, Castell-Auví A, Pallarès V, Mohien CU, Baiges I, Blay M, Ardévol A, Pinent M. Pancreatic islet proteome profile in Zucker fatty rats chronically treated with a grape seed procyanidin extract. Food Chem 2012; 135:1948-56. [DOI: 10.1016/j.foodchem.2012.06.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 06/08/2012] [Accepted: 06/19/2012] [Indexed: 12/21/2022]
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Zhu Y, Dong Y, Qian X, Cui F, Guo Q, Zhou X, Wang Y, Zhang Y, Xiong Z. Effect of superfine grinding on antidiabetic activity of bitter melon powder. Int J Mol Sci 2012; 13:14203-18. [PMID: 23203059 PMCID: PMC3509575 DOI: 10.3390/ijms131114203] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Revised: 10/19/2012] [Accepted: 10/23/2012] [Indexed: 12/11/2022] Open
Abstract
The antidiabetic activities of bitter melon powders produced with lyophilization/superfine grinding and hot air drying/normal grinding were investigated in vivo for selecting a suitable bitter melon processing procedure. After a five-week treatment, bitter melon lyophilized superfine grinding powder (BLSP) had a higher antidiabetic activity with reducing fasting blood glucose levels from 21.40 to 12.54 mmol/L, the serum insulin levels from 40.93 to 30.74 mIU/L, and restoring activities of SOD compared with those in the bitter melon hot air drying powder (BAP) treated group. Furthermore, BLSP protected pancreatic tissues including islet beta cells and reduced the loss of islet cells. Combined with the difference of compositions in BLSP and BAP, it could be concluded that superfine grinding and lyophilization processes were beneficial for presenting the antidiabetic activity, which will provide a reference for direct utilization of bitter melon as a suitable functional food to relieve symptoms of diabetes.
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Affiliation(s)
- Ying Zhu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; E-Mails: (Y.Z.); (X.Q.); (F.C.); (Q.G.); (X.Z.); (Y.W.); (Y.Z.); (Z.X.)
| | - Ying Dong
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; E-Mails: (Y.Z.); (X.Q.); (F.C.); (Q.G.); (X.Z.); (Y.W.); (Y.Z.); (Z.X.)
| | - Xiwen Qian
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; E-Mails: (Y.Z.); (X.Q.); (F.C.); (Q.G.); (X.Z.); (Y.W.); (Y.Z.); (Z.X.)
| | - Fengjie Cui
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; E-Mails: (Y.Z.); (X.Q.); (F.C.); (Q.G.); (X.Z.); (Y.W.); (Y.Z.); (Z.X.)
| | - Qin Guo
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; E-Mails: (Y.Z.); (X.Q.); (F.C.); (Q.G.); (X.Z.); (Y.W.); (Y.Z.); (Z.X.)
| | - Xinghua Zhou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; E-Mails: (Y.Z.); (X.Q.); (F.C.); (Q.G.); (X.Z.); (Y.W.); (Y.Z.); (Z.X.)
| | - Yun Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; E-Mails: (Y.Z.); (X.Q.); (F.C.); (Q.G.); (X.Z.); (Y.W.); (Y.Z.); (Z.X.)
| | - Yi Zhang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; E-Mails: (Y.Z.); (X.Q.); (F.C.); (Q.G.); (X.Z.); (Y.W.); (Y.Z.); (Z.X.)
| | - Zhiyu Xiong
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; E-Mails: (Y.Z.); (X.Q.); (F.C.); (Q.G.); (X.Z.); (Y.W.); (Y.Z.); (Z.X.)
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Ross CF, Hoye C, Fernandez-Plotka VC. Influence of heating on the polyphenolic content and antioxidant activity of grape seed flour. J Food Sci 2012; 76:C884-90. [PMID: 22417486 DOI: 10.1111/j.1750-3841.2011.02280.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
UNLABELLED The production of grape seed flour (GSF) from a waste product generated during winemaking, is of interest in product development applications due to its potential health benefits. However, before GSF can used in baking as a source of additional antioxidants, research on its heat stability is required. The overall objective of this study was to assess changes in phenolic content and antioxidant activity of GSF during heating. Merlot GSF was heated at 5 temperatures (120 to 240 °C) for 0 to 90 min. At each time/temperature combination, total phenolic content (TPC), total flavanoid content (TFC), Trolox equivalent antioxidant capacity (TEAC), 2,2 diphenyl-1-picrylhydrazyl (DPPH) radical scavenging, and ferric ion reducing antioxidant power (FRAP) of the extracts were determined. Specific polyphenolic compounds, including catechin, gallocatechin, epicatechin, and gallic acid were also measured. Results showed that when Merlot GSF was heated to ≥180 °C, significant decreases in the TPC and antioxidant activity, measured using FRAP, DPPH, and TEAC, were observed. Longer heating times also caused a reduction in antioxidant capability. Catechin and epicatechin content decreased with increasing heating temperature while gallocatechin and gallic acid content increased. Both catechin and epicatechin content had strong positive correlations (r > 0.91) with TPC and TFC, as well with FRAP and TEAC, suggesting that the GSF antioxidant activity is related to the presence of these particular compounds. Overall, while a decrease in antioxidant content was observed during heating, this occurred at higher baking temperatures. Thus GSF may be suitable for use as an ingredient in baked goods to bolster antioxidant content. PRACTICAL APPLICATION In order for Merlot grape seed flour (GSF) to be used in baking as a source of additional antioxidant compounds, the impact of heating on the polyphenolic compounds in the GSF needed to be examined. Thermal treatment of Merlot GSF caused significant decreases in the TPC, antioxidant power, and specific polyphenolic compounds when heated ≥180 °C. Thus while antioxidant content decreased with higher heating temperatures, this occurred at higher baking temperatures. Thus, GSF may be suitable for use as an ingredient in baked goods to bolster antioxidant content.
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Pinent M, Cedó L, Montagut G, Blay M, Ardévol A. Procyanidins improve some disrupted glucose homoeostatic situations: an analysis of doses and treatments according to different animal models. Crit Rev Food Sci Nutr 2012; 52:569-84. [PMID: 22530710 DOI: 10.1080/10408398.2010.501533] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review analyses the potential beneficial effects of procyanidins, the main class of flavonoids, in situations in which glucose homeostasis is disrupted. Because the disruption of glucose homeostasis can occur as a result of various causes, we critically review the effects of procyanidins based on the specific origin of each type of disruption. Where little or no insulin is present (Type I diabetic animals), summarized studies of procyanidin treatment suggest that procyanidins have a short-lived insulin-mimetic effect on the internal targets of the organism, an effect not reproduced in normoglycemic, normoinsulinemic healthy animals. Insulin resistance (usually linked to hyperinsulinemia) poses a very different situation. Preventive studies using fructose-fed models indicate that procyanidins may be useful in preventing the induction of damage and thus in limiting hyperglycemia. But the results of other studies using models such as high-fat diet treated rats or genetically obese animals are controversial. Although the effects on glucose parameters are hazy, it is known that procyanidins target key tissues involved in its homeostasis. Interestingly, all available data suggest that procyanidins are more effective when administered in one acute load than when mixed with food.
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Affiliation(s)
- Montserrat Pinent
- Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili (URV), Tarragona, Spain
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Whitlock KA, Kozicky L, Jin A, Yee H, Ha C, Morris J, Field CJ, Bell RC, Ozga JA, Chan CB. Assessment of the mechanisms exerting glucose-lowering effects of dried peas in glucose-intolerant rats. Br J Nutr 2012; 108 Suppl 1:S91-102. [PMID: 22916820 DOI: 10.1017/s0007114512000736] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The present study compared the effects of feeding uncooked pea fractions (embryo v. seed coat) on glucose homeostasis in glucose-intolerant rats and examined potential mechanisms influencing glucose homeostasis. Rats were made glucose intolerant by high-fat feeding, after which diets containing both high-fat and pea fractions were fed for 4 weeks. Rats fed diets containing uncooked pea seed coats low (non-coloured seed coat; NSC) or high (coloured seed coat; CSC) in proanthocyanidins but not embryos had improved oral glucose tolerance (P < 0·05). NSC also lowered fasting and glucose-stimulated insulin secretion (P < 0·05), decreased β-cell mass by 50 % (P < 0·05) and lowered levels of malondialdehyde, a marker of oxidative stress. Furthermore, NSC decreased the mucosal thickness of the colon by 25 % (P < 0·05), which might affect fibre fermentation and other gut functions. Small but statistically significant (P < 0·05) effects consistent with enhanced glucose transport or metabolism were observed in the skeletal muscle of rats fed NSC or CSC, for example, increased levels of AMP-dependent kinase or akt. We conclude that pea seed coats are the fraction exerting beneficial effects on glucose tolerance. Most of the changes were small in amplitude, suggesting that additive effects on multiple tissues may be important. NSC content appeared to have the most beneficial effects in improving glucose homeostasis but our ability to detect the effect of flavonoids may have been limited by their low concentration in the diet.
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Affiliation(s)
- Kevin A Whitlock
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada T6G 2R3
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Nguyen KH, Ta TN, Pham THM, Nguyen QT, Pham HD, Mishra S, Nyomba BLG. Nuciferine stimulates insulin secretion from beta cells-an in vitro comparison with glibenclamide. JOURNAL OF ETHNOPHARMACOLOGY 2012; 142:488-495. [PMID: 22633982 DOI: 10.1016/j.jep.2012.05.024] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Revised: 05/11/2012] [Accepted: 05/11/2012] [Indexed: 06/01/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Several Asian plants are known for their anti-diabetic properties and produce alkaloids and flavonoids that may stimulate insulin secretion. MATERIALS AND METHODS Using Vietnamese plants (Nelumbo nucifera, Gynostemma pentaphyllum, Smilax glabra, and Stemona tuberosa), we extracted two alkaloids (neotuberostemonine, nuciferine) and four flavonoids (astilbin, engeletin, smitilbin, and 3,5,3'-trihydroxy-7,4'-dimethoxyflavone), and studied their insulin stimulatory effects. RESULTS Nuciferine, extracted from Nelumbo nucifera, stimulated both phases of insulin secretion in isolated islets, whereas the other compounds had no effect. The effect of nuciferine was totally abolished by diazoxide and nimodipine, and diminished by protein kinase A and protein kinase C inhibition. Nuciferine and potassium had additive effects on insulin secretion. Nuciferine also stimulated insulin secretion in INS-1E cells at both 3.3 and 16.7 mM glucose concentrations. Compared with glibenclamide, nuciferine had a stronger effect on insulin secretion and less beta-cell toxicity. However, nuciferine did not compete with glibenclamide for binding to the sulfonylurea receptor. CONCLUSIONS Among several compounds extracted from anti-diabetic plants, nuciferine was found to stimulate insulin secretion by closing potassium-adenosine triphosphate channels, explaining anti-diabetic effects of Nelumbo nucifera.
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Affiliation(s)
- K Hoa Nguyen
- Department of Physiology, University of Manitoba, Winnipeg, MB, Canada R3E3P4
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Felipe ET, Maestri JS, Kanunfre CC, Curi R, Newsholme P, Carpinelli AR, Oliveira-Emilio HR. Cytotoxicity and cytoprotective effects of citrus flavonoids on insulin-secreting cells BRIN-BD11: beneficial synergic effects. Nat Prod Res 2012; 27:925-8. [PMID: 22443082 DOI: 10.1080/14786419.2012.671315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Flavonoids, in general, have potent antioxidant activity and they can be used in treating chronic diseases involving oxidative stress, such as diabetes mellitus. The purpose of this study was to evaluate the cytotoxicity and cytoprotective effects of citrus flavonoids on the functionality of BRIN-BD11 cells. The assessment of cytotoxic and cytoprotective flavonoid tested was performed using the MTT reduction assay. The flavonoids did not show cytotoxic effects in any of the tested concentrations (5-20 µM) and also negative insulinotropic effects were not observed. To cytoprotective assay, the IC50 of H2O2 in treatment of 2 h (acute oxidative stress) was measured (350 µM). Moreover, under acute oxidative stress, the isolated flavonoids (10 µM) had no cytoprotective effects. Besides an antioxidant role of the flavonoids was only observed when using in association. Thus future experiments are needed, varying the experimental condition, to better evaluate the possible mechanisms of action of these flavonoids.
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Affiliation(s)
- E T Felipe
- Evolutive Biology Post-Graduate Course, Ponta Grossa State University, Ponta Grossa, Parana, Brazil
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Castell-Auví A, Cedó L, Pallarès V, Blay MT, Pinent M, Motilva MJ, Garcia-Vallvé S, Pujadas G, Maechler P, Ardévol A. Procyanidins modify insulinemia by affecting insulin production and degradation. J Nutr Biochem 2012; 23:1565-72. [PMID: 22444499 DOI: 10.1016/j.jnutbio.2011.10.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Revised: 09/19/2011] [Accepted: 10/14/2011] [Indexed: 11/30/2022]
Abstract
Previous studies from our research group have suggested that procyanidins modify glycemia and insulinemia. The aim of this work was to evaluate the effects of procyanidins on β-cell functionality in a nonpathological system. Four groups of healthy rats were studied. The animals were given daily acute doses of grape seed procyanidin extract (GSPE) for different time periods and at different daily amounts. A β-cell line (INS-1E) was treated with 25 mg GSPE/L for 24 h to identify possible mechanisms of action for the procyanidins. In vivo experiments showed that different doses of GSPE affected insulinemia in different ways by modifying β-cell functionality and/or insulin degradation. The islets isolated from rats that were treated with 25 mg GSPE/kg of body weight for 45 days exhibited a limited response to glucose stimulation. In addition, insulin gene expression, insulin synthesis and expression of genes related to insulin secretion were all down-regulated. In vitro studies revealed that GSPE decreased the ability of β-cells to secrete insulin in response to glucose. GSPE increased glucose uptake in β-cells under high-glucose conditions but impaired glucose-induced mitochondrial hyperpolarization, decreased adenosine triphosphate (ATP) synthesis and altered cellular membrane potentials. GSPE also modified Glut2, glucokinase and Ucp2 gene expression as well as altered the expression of hepatic insulin-degrading enzyme (Ide), thereby altering insulin degradation. At some doses, procyanidins changed β-cell functionality by modifying insulin synthesis, secretion and degradation under nonpathological conditions. Membrane potentials and Ide provide putative targets for procyanidins to induce these effects.
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Affiliation(s)
- Anna Castell-Auví
- Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, Tarragona, Spain
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