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Kashtoh H, Baek KH. New Insights into the Latest Advancement in α-Amylase Inhibitors of Plant Origin with Anti-Diabetic Effects. PLANTS (BASEL, SWITZERLAND) 2023; 12:2944. [PMID: 37631156 PMCID: PMC10458243 DOI: 10.3390/plants12162944] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 08/11/2023] [Accepted: 08/13/2023] [Indexed: 08/27/2023]
Abstract
The rising predominance of type 2 diabetes, combined with the poor medical effects seen with commercially available anti-diabetic medications, has motivated the development of innovative treatment approaches for regulating postprandial glucose levels. Natural carbohydrate digestion enzyme inhibitors might be a viable option for blocking dietary carbohydrate absorption with fewer side effects than manufactured medicines. Alpha-amylase is a metalloenzyme that facilitates digestion by breaking down polysaccharides into smaller molecules such as maltose and maltotriose. It also contributes to elevated blood glucose levels and postprandial hyperglycemia. As a result, scientists are being urged to target α-amylase and create inhibitors that can slow down the release of glucose from carbohydrate chains and prolong its absorption, thereby resulting in lower postprandial plasma glucose levels. Natural α-amylase inhibitors derived from plants have gained popularity as safe and cost-effective alternatives. The bioactive components responsible for the inhibitory actions of various plant extracts have been identified through phytochemical research, paving the way for further development and application. The majority of the findings, however, are based on in vitro investigations. Only a few animal experiments and very few human investigations have confirmed these findings. Despite some promising results, additional investigation is needed to develop feasible anti-diabetic drugs based on plant-derived pancreatic α-amylase inhibitors. This review summarizes the most recent findings from research on plant-derived pancreatic α-amylase inhibitors, including plant extracts and plant-derived bioactive compounds. Furthermore, it offers insights into the structural aspects of the crucial therapeutic target, α-amylases, in addition to their interactions with inhibitors.
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Affiliation(s)
| | - Kwang-Hyun Baek
- Department of Biotechnology, Yeungnam University, Gyeongsan 38541, Republic of Korea;
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Phenolic Content, Antioxidant, Antibacterial, Antihyperglycemic, and α-Amylase Inhibitory Activities of Aqueous Extract of Salvia lavandulifolia Vahl. Pharmaceuticals (Basel) 2023; 16:ph16030395. [PMID: 36986494 PMCID: PMC10051605 DOI: 10.3390/ph16030395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 02/27/2023] [Accepted: 03/01/2023] [Indexed: 03/08/2023] Open
Abstract
Salvia lavandulifolia Vahl essential oil is becoming more popular as a cognitive enhancer and treatment for memory loss. It is high in natural antioxidants and has spasmolytic, antiseptic, analgesic, sedative, and anti-inflammatory properties. Its aqueous extract has hypoglycemic activity and is used to treat diabetic hyperglycemia, but few studies have focused on it. The objective of this work is to evaluate the various biological and pharmacological powers of Salvia lavandulifolia Vahl leaf aqueous extract. Quality control of the plant material was first carried out. Followed by a phytochemical study on the aqueous extract of S. lavandulifolia leaves, namely phytochemical screening and determination of total polyphenols, flavonoids, and condensed tannins contents. Then, the biological activities were undertaken, in particular the antioxidant activity (total antioxidant activity and trapping of the DPPH° radical) and the antimicrobial activity. The chemical composition of this extract was also determined by HPLC-MS-ESI. Finally, the inhibitory effect of the α-amylase enzyme as well as the antihyperglycaemic effect was evaluated in vivo in normal rats overloaded with starch or D-glucose. The aqueous extract obtained by use of the decoction of leaves of S. lavandulifolia contains 246.51 ± 1.69 mg EQ of gallic acid/g DE, 23.80 ± 0.12 mg EQ quercetin/g DE, and 2.46 ± 0.08 mg EQ catechin /g DE. Its total antioxidant capacity is around 527.03 ± 5.95 mg EQ of ascorbic acid/g DE. At a concentration of 5.81 ± 0.23 µg/mL, our extract was able to inhibit 50% of DPPH° radicals. Moreover, it showed bactericidal effect against Proteus mirabilis, fungicidal against Aspergillus niger, Candida albicans, Candida tropicalis, and Saccharomyces cerevisiae, and fungistatic against Candida krusei. A marked antihyperglycemic activity (AUC = 54.84 ± 4.88 g/L/h), as well as a significant inhibitory effect of α-amylase in vitro (IC50 = 0.99 ± 0.00 mg/mL) and in vivo (AUC = 51.94 ± 1.29 g/L/h), is recorded in our extract. Furthermore, its chemical composition reveals the presence of 37.03% rosmarinic acid, 7.84% quercetin rhamnose, 5.57% diosmetin-rutinoside, 5.51% catechin dimer, and 4.57% gallocatechin as major compounds. The antihyperglycemic and α-amylase inhibitory activities, associated with the antioxidant properties of S. lavandulifolia, justify its use in the treatment of diabetes in traditional medicine and highlight its potential introduction into antidiabetic drugs.
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Abid S, Bnouham M. A Review on Experimental Models to Test Medicinal Plants on Postprandial Blood Glucose in Diabetes. Curr Diabetes Rev 2023; 19:e080422203278. [PMID: 35400346 DOI: 10.2174/1573399818666220408100830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 12/07/2021] [Accepted: 01/31/2022] [Indexed: 11/22/2022]
Abstract
Due to the gravity of postprandial hyperglycemia in the development of microvascular and macrovascular diseases in diabetics, many medicinal plants are tested to determine their effectiveness in glycemic control and the mechanisms of action of the products. Consequently, various diabetic models have been developed and enhanced over the years. The objective of this review is to describe some of the experimental models to study the effect of medicinal plants used to control postprandial hyperglycemia. Data was collected from PubMed, ScienceDirect, Scopus, and Google scholar (1953-2021). Fiftyseven (57) studies were included in this review article. Ten models were identified and described. For each model, we described the targets involved and their roles in postprandial blood glucose control. The experimental design and procedures described the targets such as an α-glucosidase enzyme, SGLT1, GLUT2, DPP-IV, Na+/K+ ATPase pump, or intestinal motility in the models, experiment design and procedures were described. This review will facilitate the selection of the most appropriate model for studying agents used to investigate postprandial blood glucose.
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Affiliation(s)
- Sanae Abid
- Laboratory of Bio-Resources, Biotechnologies, Ethnopharmacology and Health, Department of Biology, Faculty of Sciences, University Mohamed Ist 60 000, Oujda, Morocco
| | - Mohamed Bnouham
- Laboratory of Bio-Resources, Biotechnologies, Ethnopharmacology and Health, Department of Biology, Faculty of Sciences, University Mohamed Ist 60 000, Oujda, Morocco
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Abdel-Moneim A, Abd El-Twab SM, Yousef AI, Ashour MB, Reheim ESA, Hamed MAA. New insights into the in vitro, in situ and in vivo antihyperglycemic mechanisms of gallic acid and p-coumaric acid. Arch Physiol Biochem 2022; 128:1188-1194. [PMID: 32401050 DOI: 10.1080/13813455.2020.1762659] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Objective: To explore the probable in vitro, in situ and in vivo mechanisms of gallic acid (GA) and p-coumaric acid (PCA) as anti-hyperglycemic agents.Animals and methods: Male albino rats were allocated into four groups, group1 was used as normal control. Group 2 was established as a diabetic control and group3 and 4 were treated with an oral dose of GA and PCA, respectively.Results: GA and PCA revealed a significant decrease in the activity of α-amylase, a noticeable rise in glucose induced-insulin secretion and glucose-uptake in peripheral glucose-uptake in vitro, increase also liver glycogen and serum insulin levels in vivo. Further, GA and PCA exhibited a significant reduction in intestinal glucose absorption in situ compared to blank.Conclusion: The antihyperglycemic activities of GA and PCA can be mediated through delaying intestinal glucose absorption, enhancing β-cell activity and promoting glucose uptake by peripheral tissue via enhancing insulin sensitivity.
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Affiliation(s)
- Adel Abdel-Moneim
- Molecular Physiology Division, Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
| | - Sanaa M Abd El-Twab
- Molecular Physiology Division, Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
| | - Ahmed I Yousef
- Molecular Physiology Division, Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
| | - Mohamed B Ashour
- Molecular Physiology Division, Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
| | - Eman S Abdel Reheim
- Molecular Physiology Division, Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
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Morgado S, Morgado M, Plácido AI, Roque F, Duarte AP. Arbutus unedo L.: From traditional medicine to potential uses in modern pharmacotherapy. JOURNAL OF ETHNOPHARMACOLOGY 2018; 225:90-102. [PMID: 29981432 DOI: 10.1016/j.jep.2018.07.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 07/03/2018] [Accepted: 07/03/2018] [Indexed: 06/08/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Arbutus unedo L., the strawberry tree (Ericaceae family) is of increasing interest because of its common traditional, industrial, chemical and pharmaceutical uses. The plant is a typical evergreen plant of the Mediterranean basin, as well as of other regions with hot summers and mild rainy winters. This review covers the studies relevant to Arbutus unedo L. utilization in the current pharmacological therapy. MATERIALS AND METHODS The available information on traditional uses, phytochemistry and biological activities of Arbutus unedo L. was collected from scientific databases through a search using the keywords 'Arbutus unedo L.' and/or 'strawberry tree' in 'Google Scholar', 'Pubmed', 'Sciencedirect', 'SpringerLink', 'Web of Science - Clarivate Analytics' and 'Wiley'. Unpublished Ph.D. and M.Sc. dissertations were also consulted for chemical composition, biological activities and traditional uses of Arbutus unedo L. and for manual search of additional references. RESULTS The fruits of the plant have been traditionally used as antiseptics, diuretics and laxatives in folk medicine, while the leaves have been used due to their diuretic, urinary antiseptic, antidiarrheal, astringent, depurative and antihypertensive properties. According to the scientific literature survey, different extracts obtained from Arbutus unedo L. have demonstrated a high pharmacological potential due to their in vitro and preclinical antibiotic, antifungal, antiparasitic, antiaggregant, antidiabetic, antihypertensive, anti-inflammatory, antitumoral, antioxidant, and spasmolytic properties. CONCLUSION This review suggests that A. unedo is a promising source of phytopharmaceutical products. The potential advantages of Arbutus unedo are related with the presence of polyphenolic compounds in its composition. However, further studies are needed to ascertain some profitable effects in humans. The beneficial effects associated with this shrub suggest that Arbutus unedo can be used for the development of new drugs to treat diseases such diabetes, hypertension, among others. Nonetheless, the safety of the Arbutus unedo compounds should also be examined.
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Affiliation(s)
- Sandra Morgado
- Hospital Centre of Cova da Beira, E.P.E., Quinta do Alvito, 6200-251 Covilhã, Portugal.
| | - Manuel Morgado
- Hospital Centre of Cova da Beira, E.P.E., Quinta do Alvito, 6200-251 Covilhã, Portugal; University of Beira Interior, Faculty of Health Sciences, Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal; School of Health Sciences, Polytechnic Institute of Guarda, Avenida Rainha D. Amélia, S/N, 6300-749 Guarda, Portugal; CICS-UBI - Health Sciences Research Centre, University of Beira Interior, Av. Infante D. Henrique, 6200-506 Covilhã, Portugal.
| | - Ana I Plácido
- School of Health Sciences, Polytechnic Institute of Guarda, Avenida Rainha D. Amélia, S/N, 6300-749 Guarda, Portugal; Research Unit for the Development of the Interior, Avª Dr. Francisco Sá Carneiro, no. 50, 6300-559 Guarda, Portugal.
| | - Fátima Roque
- School of Health Sciences, Polytechnic Institute of Guarda, Avenida Rainha D. Amélia, S/N, 6300-749 Guarda, Portugal; CICS-UBI - Health Sciences Research Centre, University of Beira Interior, Av. Infante D. Henrique, 6200-506 Covilhã, Portugal; Research Unit for the Development of the Interior, Avª Dr. Francisco Sá Carneiro, no. 50, 6300-559 Guarda, Portugal.
| | - Ana Paula Duarte
- University of Beira Interior, Faculty of Health Sciences, Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal; CICS-UBI - Health Sciences Research Centre, University of Beira Interior, Av. Infante D. Henrique, 6200-506 Covilhã, Portugal.
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Arome D, Agbafor A, Oluebube W. Evaluation of antidiabetic property of quail egg on alloxan-induced diabetes mellitus in Wistar albino rats. JOURNAL OF CURRENT RESEARCH IN SCIENTIFIC MEDICINE 2017. [DOI: 10.4103/jcrsm.jcrsm_32_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Osama M A, Eman S AR, Mohammed BA, Hanaa I F, Hassnaa HM. Efficacies of Eruca Sativa and Raphanus Sativus Seeds’ Oils in Streptozotocin- Induced Diabetic Rats. ACTA ACUST UNITED AC 2016. [DOI: 10.17352/ijcem.000020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Porres-Martínez M, González-Burgos E, Carretero ME, Gómez-Serranillos MP. Protective properties of Salvia lavandulifolia Vahl. essential oil against oxidative stress-induced neuronal injury. Food Chem Toxicol 2015; 80:154-162. [PMID: 25778348 DOI: 10.1016/j.fct.2015.03.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 01/28/2015] [Accepted: 03/02/2015] [Indexed: 11/29/2022]
Abstract
Salvia lavandulifolia Vahl., known as "Spanish sage", has potential value in dementia for its sedative, antioxidant, anti-inflammatory and anticholinesterase properties. This work aimed to evaluate the in vitro neuroprotective activity of S. lavandulifolia essential oils, obtained from plants at different phenological stages (vegetative and flowering phases) and plants grown at different densities, against H2O2-induced oxidative stress in PC12 cells. The effect on cell viability and morphology, lipid peroxidation, GSH/GSSG ratio, intracellular ROS levels, antioxidant enzymes (CAT, SOD, GR, GPx, HO-1) and apoptotic enzymes was investigated. Comparing with H2O2-treated PC12 cells, pretreatments with essential oil samples attenuated morphological changes and loss of cell viability, decreased MDA levels and intracellular ROS production and increased GSH/GSSG ratio. Moreover, Spanish sage increased antioxidant status as evidenced in an increase of antioxidant enzyme activity and protein expression and inhibited caspase-3 activity. Furthermore, our results suggest that S. lavandulifolia essential oils are able to activate Nrf2 transcription factor. Collectively, the sample of essential oil obtained with the highest densities of planting and at flowering phase exerted the major neuroprotective activity. Our findings demonstrate that S. lavandulifolia essential oils may have therapeutic value for the prevention and treatment of neurodegenerative diseases associated with oxidative stress-induced neuronal injury.
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Affiliation(s)
- María Porres-Martínez
- Department of Pharmacology, Faculty of Pharmacy, University Complutense of Madrid, Plaza de Ramón y Cajal s/n 28040, Madrid, Spain
| | - Elena González-Burgos
- Department of Pharmacology, Faculty of Pharmacy, University Complutense of Madrid, Plaza de Ramón y Cajal s/n 28040, Madrid, Spain
| | - M Emilia Carretero
- Department of Pharmacology, Faculty of Pharmacy, University Complutense of Madrid, Plaza de Ramón y Cajal s/n 28040, Madrid, Spain
| | - M Pilar Gómez-Serranillos
- Department of Pharmacology, Faculty of Pharmacy, University Complutense of Madrid, Plaza de Ramón y Cajal s/n 28040, Madrid, Spain.
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Mahmoud AM, Ahmed OM, Ashour MB, Abdel-Moneim A. In vivo and in vitro antidiabetic effects of citrus flavonoids; a study on the mechanism of action. Int J Diabetes Dev Ctries 2015. [DOI: 10.1007/s13410-014-0268-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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Essential oil composition of wild populations of Salvia lavandulifolia Vahl. from Castilla-La Mancha (Spain). BIOCHEM SYST ECOL 2010. [DOI: 10.1016/j.bse.2010.10.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Bnouham M, Merhfour FZ, Ziyyat A, Aziz M, Legssyer A, Mekhfi H. Antidiabetic effect of some medicinal plants of Oriental Morocco in neonatal non-insulin-dependent diabetes mellitus rats. Hum Exp Toxicol 2010; 29:865-71. [PMID: 20154101 DOI: 10.1177/0960327110362704] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The goal of the present study is to test the effect of water extract (WE) of four medicinal plants used as antidiabetics in Eastern Morocco (Arbutus unedo: Au, Ammoïdes pusilla: Ap, Thymelaea hirsuta: Th, and Urtica dioïca: Ud). These plants are used in cooking to bring out the flavor in a dish or to complement it. The first experiment was realized in order to determine the antidiabetic effect of the WE of these plants during 5 weeks' treatment. Seven groups of Wistar rats were used: Healthy controls, neonatal streptozotocin (n-stz) induced-diabetic rats (90 mg/kg; intraperitoneally [i.p.]), n-stz + tolbutamide (400 mg/l), and 4 groups n-stz + WE of plants (400 mg/l, drink water). The percentages of Plasma glucose lowering effect were, respectively for Au, Ap, Th, Ud and tolbutamide: 31.6 % p<0.01, 27.4 % p<0.05, 38.2 % p<0.01, 13 % and 33.9 % p<0.05 when compared with untreated diabetic controls. In a second experiment, oral glucose tolerance tests were carried out in n-stz induced-diabetic rats. The i.p. administration of the water extract (WE) of Ap and Ud (150 mg/kg) 30 minutes before the glucose overload (2 g/kg) showed a significant reduction glycemia, respectively of 36 % at 60 min (p<0.05) and 50 % at 180 min (p<0.05) after glucose overload compared with controls. In contrast, the effect of WE of Au and Th (150 mg/kg, i.p.) was not significant. The in vitro study of glucose utilization by isolated rat hemidiaphragm suggests that these extracts in combination with insulin potentiate its activity and enhance the utilization of glucose. In conclusion, it seems that these plants possess antidiabetic activity.
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Affiliation(s)
- Mohamed Bnouham
- Laboratory of Physiology and Ethnopharmacology, UFR Physiology and Pharmacology, Department of Biology, Faculty of Sciences, University Mohamed Ist, Oujda, Morocco.
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Loizzo MR, Saab AM, Tundis R, Menichini F, Bonesi M, Piccolo V, Statti GA, de Cindio B, Houghton PJ, Menichini F. In vitro inhibitory activities of plants used in Lebanon traditional medicine against angiotensin converting enzyme (ACE) and digestive enzymes related to diabetes. JOURNAL OF ETHNOPHARMACOLOGY 2008; 119:109-116. [PMID: 18601990 DOI: 10.1016/j.jep.2008.06.003] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2007] [Revised: 05/21/2008] [Accepted: 06/07/2008] [Indexed: 05/26/2023]
Abstract
AIM OF THE STUDY In recent years the use of medicinal plants has been growing worldwide and this is particularly true in Lebanon. In the present investigation we report the inhibitory activity against digestive enzymes related to diabetes and angiotensin converting enzyme (ACE) of extracts of nine plant species collected in Lebanon, where they have a traditional use against diabetes. MATERIALS AND METHODS In order to evaluate if the extraction procedure could influence the activity we decided to perform different extractions with methanol, n-hexane and chloroform of Calamintha origanifolia, Satureja thymbra, Prangos asperula, Sideritis perfoliata, Asperula glomerata, Hyssopus officinalis, Erythraea centaurium, Marrubium radiatum and Salvia acetabulosa and test each of them. RESULTS AND CONCLUSIONS Marrubium radiatum and Salvia acetabulosa methanol extracts exerted the highest activity against alpha-amylase (IC(50) 61.1 and 91.2 microg/ml, respectively) and alpha-glucosidase (IC(50) 68.8 and 76.9 microg/ml, respectively). The same extracts exhibited a strong inhibitory activity against ACE with IC(50) of 72.7 and 52.7 microg/ml, respectively. The results support the traditional use of some the species examined.
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Affiliation(s)
- Monica R Loizzo
- Faculty of Pharmacy, Nutrition and Health Sciences, Department of Pharmaceutical Sciences, University of Calabria, I-87036 Rende (CS), Italy.
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Perry NSL, Bollen C, Perry EK, Ballard C. Salvia for dementia therapy: review of pharmacological activity and pilot tolerability clinical trial. Pharmacol Biochem Behav 2003; 75:651-9. [PMID: 12895683 DOI: 10.1016/s0091-3057(03)00108-4] [Citation(s) in RCA: 226] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
S. lavandulaefolia Vahl. (Spanish sage) extracts and constituents have demonstrated anticholinesterase, antioxidant, anti-inflammatory, oestrogenic and CNS depressant (sedative) effects all of which are currently relevant to the treatment of Alzheimer's disease (AD). The essential oil inhibits the enzyme acetylcholinesterase (AChE) from human brain tissue and bovine erythrocyte and individual monoterpenoid constituents inhibit AChE with varying degrees of potency. In vivo AChE inhibition of select brain (striatal and hippocampal over cortical) AChE was obtained following oral administration of the essential oil to rats. In a study in healthy volunteers essential oil administration produced significant effects on cognition. In a pilot open-label study involving oral administration of the essential oil to patients with AD, a significant increase in diastolic and systolic blood pressure was observed in two patients, however this may have been due primarily to preexisting hypertension and there were no abnormalities in other vital signs or blood samples during the trial period. Although an open label trial is not free from practice effects or rater-caregiver expectations, statistically significant differences between baseline and 6 weeks treatment were a reduction in neuropsychiatric symptoms and an improvement in attention.
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Affiliation(s)
- Nicolette S L Perry
- Department of Pharmacology and Toxicology, University of Otago, Dunedin, New Zealand
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Alarcon-Aguilar FJ, Roman-Ramos R, Flores-Saenz JL, Aguirre-Garcia F. Investigation on the hypoglycaemic effects of extracts of four Mexican medicinal plants in normal and alloxan-diabetic mice. Phytother Res 2002; 16:383-6. [PMID: 12112298 DOI: 10.1002/ptr.914] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The hypoglycaemic activities of four water ethanol extracts (WEE) prepared from Bidens pilosa L., Salvia officinalis L., Psacalium peltatum H.B.K. (Cass) and Turnera diffusa Willd. were investigated in healthy and alloxan-diabetic mice. The WEE of S. officinalis significantly reduced the blood glucose of fasting normal mice 120 (15.7%) and 240 min (30.2%) after intraperitoneal administration (p < 0.05). The WEE of P. peltatum and B. pilosa also significantly diminished glycaemia in healthy mice at 240 min (19.6% and 13.8%, respectively). In mildly diabetic mice, the WEE of P. peltatum lowered the basal blood glucose level 120 (16%) and 240 min (54%) after intraperitoneal administration (p < 0.05 and p < 0.01, respectively). The WEE of B. pilosa and S. officinalis also significantly diminished the hyperglycaemia in mildly diabetic mice at 240 mins (32.6% and 22.7%, respectively). The administration of these three extracts to animals with severe hyperglycaemia did not cause a significant decrease. The WEE of T. diffusa did not show any hypoglycaemic activity. Thus, three of the WEE studied conserved the hypoglycaemic activity originally detected in the traditional preparations of the studied antidiabetic plants. It appears that these extracts require the presence of insulin to show hypoglycaemic activity.
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Affiliation(s)
- F J Alarcon-Aguilar
- Departamento de Ciencias de la Salud, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Apartado postal 55-535, 09340 México D.F., México
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Abstract
The effect of Salvia leriifolia leaf extract on morphine dependence was investigated in mice. Dependence was induced using subcutaneous injections of morphine daily for 3 days. On day 4, morphine was injected 2 h before the intraperitoneal injection of naloxone. The number of episodes of jumping during the 30 min after injection of naloxone was considered as the intensity of the withdrawal syndrome. The ethanol extract reduced the number of jumping episodes dose-dependently. The extract at a dose of 500 mg/kg was as effective as a dose of 5 mg/kg of diazepam in reducing the number of jumping episodes. The effect of the extract was blocked by aminophylline (20 mg/kg), a non-selective antagonist of adenosine receptors. It is concluded that the ethanol extract of S. leriifolia leaves could diminish the withdrawal syndrome of morphine.
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Affiliation(s)
- H Hosseinzadeh
- Department of Pharmacodynamy and Toxicology, Faculty of Pharmacy, Mashhad University of Medical Sciences, I.R. Iran
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Zarzuelo A, Jiménez I, Gámez MJ, Utrilla P, Fernadez I, Torres MI, Osuna I. Effects of luteolin 5-O-beta-rutinoside in streptozotocin-induced diabetic rats. Life Sci 1996; 58:2311-6. [PMID: 8649220 DOI: 10.1016/0024-3205(96)00231-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We have investigated the antidiabetic activity of luteolin 5-rutinoside in streptozotocin(STZ)-induced diabetic rats. Treatment for 20 days with 2 mg/kg increased both pancreatic insulin and DNA content. When both luteolin 5-rutinoside (2 mg/kg) and glibenclamide (1 mg/kg) were administered concurrently to STZ-diabetic rats, a marked antidiabetic activity was achieved. This effect was evidenced by a significant decrease in glycemia levels (> 50%), a 2.5-fold increase in insulin blood levels and an increase in body and pancreas weight, compared to the diabetic control group.
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Affiliation(s)
- A Zarzuelo
- Departamento de Farmacología, Facultad de Farmacia, Universidad de Granada, Spain
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Jiménez I, Jiménez J, Gámez MJ, González M, De Medina FS, Zarzuelo A, Osuna I. Effects ofSalvia lavandulifolia Vahl. ssp.Oxyodon extract on pancreatic endocrine tissue in streptozotocin-diabetic rats. Phytother Res 1995. [DOI: 10.1002/ptr.2650090717] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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