@article {1140, title = {Effect of Glutathione Enriched Polyherbal Formulation on Streptozotocin Induced Diabetic Model by Regulating Oxidative Stress and PKC Pathway}, journal = {Pharmacognosy Research}, volume = {15}, year = {2023}, month = {February 2023}, pages = {347-355}, type = {Original Article }, chapter = {347}, abstract = {

Background: Increasing evidence shows that oxidative stress is one of the root causes of metabolic disorders like diabetes. Glucose oxidation and activation of various metabolic pathways lead to a disproportionate generation of free radicals. This will significantly reduce the antioxidant status in the body. Objectives: In the present study, we aimed to evaluate the effect of a novel glutathione enriched polyherbal formulation on a streptozotocin induced diabetic model. Materials and Methods: Diabetes was induced by a single intraperitoneal injection of streptozotocin. After 3 days of injection, Glibenclamide (5mg/kg), and glutathione enriched polyherbal formulation were given orally for 28 days. Fasting blood glucose and body weight changes were measured at specific intervals. For the study, antioxidant enzymes, lipid peroxidation products, nitrite, liver enzyme markers, gene expression of GLUT{\textendash}2, and PKC levels were evaluated. Histopathological analysis was also done. Results: The result shows that glutathione enriched polyherbal formulation treated rats significantly reduced their blood glucose and maintained their body weight. As a result, the GLUT{\textendash}2 expression was reduced, which prevented the activation of PKC. Moreover, oxidative stress was reduced by improving antioxidants like SOD, CAT, GPx, and GSH by inhibiting the lipid peroxidation process. In addition, hepatic damage was also prevented by protecting the liver cells, and thereby shielding the excessive leakage of SGOT, SGPT, and ALP enzymes. The histopathological analysis of the liver gives more support to other data. Conclusion: Findings show that glutathione{\textendash}enriched polyherbal formulations have a powerful anti-diabetic effect by inhibiting oxidative stress and thus blocking PKC activation.

}, keywords = {Antioxidants, Diabetes, Glucose transporter, Oxidative stress, PKC}, doi = {10.5530/pres.15.2.037}, author = {Sheethal S and Ratheesh M and Svenia P Jose and Sandya S} } @article {1095, title = {Effect of Some Naturally Occurring Monoterpenes viz d-Limonene, p-Cymene and Terpinolene on the Glycemic and Hepatic Function in a Rat Model of Type 2 Diabetes Mellitus}, journal = {Pharmacognosy Research}, volume = {14}, year = {2022}, month = {October 2022}, pages = {446-453}, type = {Original Article}, chapter = {446}, abstract = {

Background: Diabetes mellitus is an increasingly serious health problem in society with type 2 diabetes the most common type of diabetes. Objectives: Our main aim was to test the efficacy of some naturally occurring pure monoterpenes viz d-limonene, p-cymene, terpinolene in modulating glycemic and hepatic function. Materials and Methods: Rats were given soybean oil (as source of fat) for 28 days once daily per os and a single dose of 35mg/ kg streptozotocin i.p. at the end for diabetes induction. Post diabetes detection, animals were treated with d-limonene 300mg/kg, p-cymene (150mg/kg and 200mg/kg), terpinolene (12.5mg/kg and 25 mg/kg) and standard anti-diabetic drug glibenclamide (5mg/kg) once daily orally for a period of another 28 days. At the end of the experimental period, blood glucose, serum levels of insulin, HbA1c, ALP, ALT, AST, GGT, total protein and albumin were determined. Liver was isolated for histopathology. Results: Biochemical profile revealed that d-limonene, p-cymene, and terpinolene significantly restored blood glucose, serum insulin, glycated hemoglobin, ALP, ALT, AST, GGT, albumin and total protein. However, d-limonene (300mg/kg) and terpinolene (25mg/kg) exhibited more pronounced activity than p-cymene (150mg/kg). Histopathology of diabetic group revealed binucleated cells, degeneration of parenchyma, clear cell foci, granular cytoplasm, prominent nucleoli and darkly stained nucleolus while d-limonene, p-cymene and terpinolene treated groups were successful in slowing down the progression of pathology associated with hepatic architecture. Conclusion: D-limonene, p-cymene and terpinolene have the potential to control parameters related to glycemia. Because of the fact that type 2 diabetics are at risk of several liver pathologies, d-limonene, p-cymene and terpinolene exhibited hepatoprotective activity also.

}, keywords = {Diabetes, Histopathology, Liver, Rats, Streptozotocin}, doi = {10.5530/pres.14.4.65}, author = {Sheeba Shakeel and Nahida Tabassum} } @article {1018, title = {Preliminary Assessment of Glycemic Control and Body Fat Reduction Effects of Terminalia chebula Retz. Extract on Pre-diabetic Subjects}, journal = {Pharmacognosy Research}, volume = {14}, year = {2022}, month = {December 2021}, pages = {5-11}, type = {Original Article}, chapter = {5}, abstract = {

Background: Terminalia chebula Retz. (Combretaceae) is a medicinal herb using in traditional medicine worldwide and has hypoglycemic effects in animal models. Objectives: The present study was a double-blind, placebo-controlled trial designed to study the effect of T. chebula fruit water extract (TFWE) in pre-diabetic subjects. The efficacy of TFWE and placebo were compared in terms of reducing fasting blood sugar (FBS) levels, body mass indexes (BMI), body circumferences and skinfold thicknesses. Adverse events of TFWE intervention were also investigated. Materials and Methods: TFWE was phytochemically quantitated by HPLC analysis and its inhibitory action on alpha-glucosidase. In a clinical study, 80 pre-diabetic healthy subjects were classified according to BMI as normal weight and overweight and each group was further divided into 2 groups. The treatment group received 2 capsules of TFWE 500 mg, 2 times per day, before meals for 8 weeks and the control group received 2 placebo capsules, taken orally as the treatment group. Data was collected at week 0, 4 and 8 of the study. Results: For overweight participants receiving TFWE, the mean FBS levels were significantly lower than that of the placebo group (p = 0.026) at week 8. Visceral fat levels also showed a significant reduction (p = 0.039) compared to the placebo group. TFWE dispensation did not show serious adverse events. Conclusion: The administration of 2,000 mg TFWE per day was considered safe for the pre-diabetic healthy subjects with benefits in obesity management.

}, keywords = {Diabetes, Fasting blood sugar, Obesity, Terminalia, Visceral fat.}, doi = {10.5530/pres.14.1.2}, url = {https://phcogres.com/fulltext/v14i1/105530pres1412.html}, author = {Sansanee Sombattera and Bunleu Sungthong and Prasoborn Rinthong} } @article {54, title = {Leaf Extracts of Glyphaea brevis Attenuate High Blood Glucose and Lipids in Diabetic Rats Induced with Streptozotocin}, journal = {Pharmacognosy Research}, volume = {13}, year = {2021}, month = {May 2021}, pages = {82-88}, type = {Original Article}, chapter = {82}, abstract = {

Background:\ Diabetes is a non-communicable disease causing impairment of carbohydrate and lipid metabolisms. Previous ethnobotanical surveys showed that leaves of\ Glyphaea brevis\ (G. brevis) are used conventionally in the treatment of diabetes with limited scientific evidence.\ Objective:\ We aimed to determine the effects of aqueous (AE) and hydroethanolic extracts (HEE) of\ G. brevis\ leaves in attenuating diabetes-linked hyperglycemia and hyperlipidemia in an animal model.\ Materials and Methods:\ Thirty streptozotocin-induced diabetic male rats were divided into six groups receiving the following daily treatments for 4 weeks orally: control (distilled water), reference (tolbutamide 80 mg/kg) and 4 tests (AE 250 mg/kg, AE 500 mg/kg, HEE 250 mg/kg, and HEE 500 mg/kg). The effects of each treatment on postprandial hyperglycemia were assessed using oral glucose tolerance and oral starch tolerance tests. Blood was collected to assess the effects of treatments on fasting plasma glucose, glycated hemoglobin (HbA1c), and lipid profile. Liver glycogen and gluconeogenic enzyme activity were also measured.\ Results:\ AE- and HEE-treated rats had 36\%{\textendash}64\% lower fasting blood glucose levels, 34\%{\textendash}73\% lower postprandial glycemia, and 15\%{\textendash}75\% lower HbA1c\ than rats from control group (P\ \< 0.01). AE and HEE treatments also brought about a significant increase in liver glycogen levels and lower gluconeogenic enzyme activity (P\ \< 0.01). Extract-treated groups also had lower plasma total cholesterol and low-density lipoprotein-cholesterol concentrations (P\ \< 0.01).\ Conclusion:\ These results suggest that treatment with leaf extracts of\ G. brevis\ is effective in attenuating hyperglycemia and hyperlipidemia in streptozotocin-induced diabetic rats. Future studies will determine the active compounds accountable for these beneficial effects.

}, keywords = {Diabetes, Glyphaea brevis, Hyperglycemia, Hyperlipidemia}, doi = {10.4103/pr.pr_99_20}, author = {William Dakam and Christine Fernande Nyangono Biyegue and Simone V{\'e}ronique Fannang and Julius Enyong Oben} } @article {84, title = {Phytochemical Analysis, Antidiabetic Potential and in-silico Evaluation of Some Medicinal Plants}, journal = {Pharmacognosy Research}, volume = {13}, year = {2021}, month = {June 2021}, pages = {140-148}, type = {Original Article}, chapter = {140}, abstract = {

Background: The increasing frequency of diabetes patients and the reported side effects of commercially available anti-hyperglycemic drugs have gathered the attention of researchers towards the search for new therapeutic approaches. Inhibition of activities of carbohydrate hydrolyzing enzymes is one of the approaches to reduce postprandial hyperglycemia by delaying digestion and absorption of carbohydrates. Objectives: The objective of the study was to investigate phytochemicals, antioxidants, digestive enzymes inhibitory effect, and molecular docking of potent extract. Materials and Methods: In this study, we carry out the substratebased α-glucosidase and α-amylase inhibitory activity of Asparagus racemosus, Bergenia ciliata, Calotropis gigantea, Mimosa pudica, Phyllanthus emblica, and Solanum nigrum along with the determination of total phenolic and flavonoids contents. Likewise, the antioxidant activity was evaluated by measuring the scavenging of DPPH radical. Additionally, antibacterial activity was also studied by Agar well diffusion method. Molecular docking of bioactive compounds from B. ciliata was performed via AutoDock vina. Results: B. ciliata, M. pudica, and P. emblica exhibit significant inhibitory activity against the α-glucosidase and α-amylase with IC50 (μg/ml) of (2.24 {\textpm} 0.01, 46.19 {\textpm} 1.06), (35.73 {\textpm} 0.65, 99.93 {\textpm} 0.9) and (8.12 {\textpm} 0.29, no significant activity) respectively indicating a good source for isolating a potential drug candidate for diabetes. These plant extracts also showed significant antioxidant activity with the IC50 ranges from 13.2 to 26.5 μg/mL along with the significant antibacterial activity towards Staphylococcus aureus and Klebsiella pneumonia. Conclusion: Bergenia extract appeared to be a potent α-glucosidase and α-amylase inhibitor. Further research should be carried out to characterize inhibitor compounds.

}, keywords = {Diabetes, Medicinal plants, Molecular docking, α-Amylase, α-Glucosidase}, doi = {10.5530/pres.13.3.6}, author = {Basanta Kumar Sapkota and Karan Khadayat and Bikash Adhikari and Darbin Kumar Poudel and Purushottam Niraula and Prakriti Budhathoki and Babita Aryal and Kusum Basnet and Mandira Ghimire and Rishab Marahatha and Niranjan Parajuli} } @article {99, title = {Evaluation of Biochemical Changes in Diabetic Rats Treated with Aegle marmelos (L.) Methanolic Leaf Extract}, journal = {Pharmacognosy Research}, volume = {12}, year = {2020}, month = {May 2020}, pages = {127-130}, type = {Original Article}, chapter = {127}, abstract = {

Background: Aegle marmelos (L.) Correa is a widely found plant in India as well as in South Asia. For more than several centuries, it is being widely used for its medicinal properties. Objective: The objective of this study was to evaluate the biochemical changes in alloxan-induced diabetic rats treated with methanolic leaf extracts of A. marmelos. Materials and Methods: Six treatment groups, namely control, diseased, standard (glimepiride), low dose (100 mg/kg), medium dose (250 mg/kg), and high dose (500 mg/kg) of methanolic leaf extracts, were used in the study. The biochemical effects were evaluated by the determination of bodyweight, blood glucose, serum glutamic oxaloacetic transaminase (SGOT), serum glutamic pyruvic transaminase (SGPT), total proteins, serum albumin, serum creatinine, and alkaline phosphatase. Results: A significant increase in the bodyweight of the animals was observed in the high-dose treated animals (350.0 {\textpm} 6.15) when compared to the diseased group animals (241.0 {\textpm} 7.23). A significant decrease in the blood glucose, SGOT, and SGPT levels was observed in the high-dose treated animals (142.3 {\textpm} 20.52, 71.6 {\textpm} 4.8, and 24.5 {\textpm} 2.42) when compared to the diseased group animals (292.8 {\textpm} 29.34, 146.3 {\textpm} 11.12, and 74.5 {\textpm} 2.88), respectively. Similarly, total proteins, serum albumin, serum creatinine, and alkaline phosphatase levels of the high-dose treated animals were also significantly decreased (6.1 {\textpm} 0.26, 4.2 {\textpm} 0.22, 0.4 {\textpm} 0.18, and 109.2 {\textpm} 14.58) when compared to the diseased group animals (9.7 {\textpm} 0.27, 5.4 {\textpm} 0.26, 1.0 {\textpm} 0.22, and 257.2 {\textpm} 8.22), respectively. Conclusion: Through the biochemical changes, it is evident that the high dose of methanolic leaf extract of A. marmelos can be used in the treatment of diabetes and its complications.

}, keywords = {Aegle marmelos, Alloxan, Bael, Diabetes, Rutaceae}, doi = {10.4103/pr.pr_53_19}, author = {Ravi Babu Birudu and Padmavathi Pamulapati and Sathish Kumar Manoharan} } @article {313, title = {Antioxidant and Antidiabetic Activities of Methanolic Extract of Cinnamomum Cassia}, journal = {Pharmacognosy Research}, volume = {10}, year = {2018}, month = {July 2018}, pages = {237-242}, type = {Original Article}, chapter = {237}, abstract = {

Background: Cinnamomum cassia or Chinese cinnamon is one of the fundamental herbs in traditional Chinese medicine. C. cassia is used as astringent, antiseptic, and used for the treatment of metabolic disorders. The antioxidant and antidiabetic effects of its extracts are unclear. Hence, the present study is planned to investigate the antioxidant and antidiabetic effects of methanolic extracts barks of C. cassia. Materials and Methods: Bark of C. cassia was extracted with methanol, ethanol, and acetone and its antioxidant activity was studied using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) free radical scavenging assays. Acute toxic effect of methanolic extract of C. cassia (MECC) carried out as Organisation for Economic Co-operation and Development guidelines. MECC was studied for its antidiabetic effect using streptozotocin (STZ)-induced diabetic rats. Results: In both DPPH and ABTS free radical scavenging assay, methanolic and ethanolic extracts exhibited free radical scavenging activity. In acute toxicity testing, MECC did not show any significant toxic signs up to 2000 mg/kg, hence the antidiabetic activity of MECC was carried out at the dose levels of 125, 250, and 500 mg/kg. MECC showed antidiabetic activity from 2nd week of the experiment onward. At the end of the study, diabetic animals showed significant increases in the levels of total cholesterol (TC), very-low-density lipoprotein, and TC/high-density lipoprotein radio compare with that of normal control and MECC prevented the STZ-induced hyperlipidemia. In the histopathological analysis, sections from the liver, pancreas, and kidney of the diabetic animals and the animals treated with MECC 500 mg/kg showed mid-to-moderate toxic effects. Conclusion: The MECC exhibited significant antioxidant and antidiabetic activities.

}, keywords = {Cinnamomum cassia, Diabetes, Sprague-Dawley rats, Streptozotocin}, doi = {10.4103/pr.pr_162_17}, author = {Jasvin Singh and Subramani Parasuraman and Sathasivam Kathiresan} } @article {345, title = {Study of Glucose Uptake Enhancing Potential of Fenugreek (Trigonella foenum graecum) Leaves Extract on 3T3 L1 Cells Line and Evaluation of its Antioxidant Potential}, journal = {Pharmacognosy Research}, volume = {10}, year = {2018}, month = {October 2018}, pages = {347-353}, type = {Original Article}, chapter = {347}, abstract = {

Background: The incidence of diabetes mellitus (DM) is increasing at an alarming rate globally. There is a need for suitable natural alternatives for its treatment, as the regular use of drugs causes several secondary health issues. Aim: This study aimed to quantitatively evaluate the phenol and flavonoid content; antioxidant and anti-diabetic activity of fenugreek seeds and leaves in water and ethanolic extracts. Materials and Methods: Dried and powdered seeds and leaves of fenugreek were treated at different time and temperature combinations (100{\textdegree}C for 10 min; 80{\textdegree}C for 30 min; 60{\textdegree}C for 1 h; 37{\textdegree}C for 6 h; 24{\textdegree}C [room temperature] for 24 h; 100{\textdegree}C for 10 min followed by overnight soaking). Total phenolic content, total flavonoid content, 2,2-Diphenyl-1-picrylhydrazyl (DPPH), and glucose uptake assays on 3T3-L1 cell lines were performed on the extracts. Results: The results show that fenugreek leaves treated at 100{\textdegree}C for 10 min and overnight soaking yield extracts with the highest concentrations of desired phenols (46.08 {\textpm} 0.15 mg GAE/g sample) and flavonoid content (13.02 {\textpm} 0.44 mg/g sample) and antioxidant activity (DPPH) (45.41 {\textpm} 2.1\%) with enhanced glucose uptake activity in 3T3-L1 cell lines. Conclusion: The phenolic and flavonoid content, DPPH radical scavenging activity and antidiabetic activity was highest in the water extract of fenugreek leaves treated at 100{\textdegree}C for 10 min and subsequent soaking for 24 h before filtration as compared to the other protocols tested. Furthermore, water extracts showed enhanced activity as compared to the ethanol extracts in case of both seeds and leaves and in all the treatment combinations.

}, keywords = {3T3-L1 cell lines, Antioxidant, Diabetes, Fenugreek, Glucose uptake}, doi = {10.4103/pr.pr_50_18}, author = {Debarupa Hajra and Santanu Paul} } @article {357, title = {Hepatoprotective, Antihyperlipidemic, and Anti-inflammatory Activity of Moringa oleifera in Diabetic-induced Damage in Male Wistar Rats}, journal = {Pharmacognosy Research}, volume = {9}, year = {2017}, month = {April 2017}, pages = {182-187}, type = {Original Article}, chapter = {182}, abstract = {

Background: The number of individuals with diabetes is increasing daily, and diabetes is presently estimated to affect about 422 million adults worldwide. Conventional drugs used to treat diabetes are not without severe side effects, accessibility, and affordability. This study elucidates the potential effects of Moringa oleifera (MO) leaves extract to manage and treat diabetes induced in male Wistar rats. Materials and Methods: Adult male Wistar rats were randomly divided into four groups (n = 12/group): NC {\textendash} nondiabetic rats (positive control), MO {\textendash} nondiabetic-treated rats, DM {\textendash} diabetic rats (negative control), DM + MO {\textendash} diabetic-treated rats. Hepatic enzymes and biochemical parameters as well as antioxidant capacity and inflammatory cytokine levels were assessed. Levels of low-density lipoprotein, high-density lipoprotein, and total cholesterol were evaluated. Results: Oral administration of methanolic extract of MO (250 mg/kg) to diabetic rats for 42 days showed a significant reduction in hepatic enzyme markers and normalized lipid profile parameters in the serum compared to normal control group. Treatment also increased the level of antioxidant capacity and alleviated inflammatory biomarkers of the liver. Histology sections of the liver tissue showed protective effect of MO in treated rats. Conclusions: MO showed hepatoprotective, anti-inflammatory, and lipid-lowering effects against streptozotocin-induced hepatotoxicity. Histological section demonstrated specific alterations in the liver of the diabetic and nondiabetic male Wistar rats while MO treatment revealed improvement in liver alterations.

}, keywords = {Diabetes, Hepatic enzymes, Inflammatory cytokines, Lipid profile, Moringa oleifera, Streptozotocin}, doi = {10.4103/0974-8490.204651}, author = {Elizabeth I Omodanisi and Yapo G Aboua and Novel N Chegou and Oluwafemi O Oguntibeju} } @article {557, title = {Improvement of Insulin Secretion and Pancreatic β-cell Function in Streptozotocin-induced Diabetic Rats Treated with Aloe vera Extract}, journal = {Pharmacognosy Research}, volume = {9}, year = {2017}, month = {December 2017}, pages = {s99-s104}, type = {Original Article}, chapter = {s99}, abstract = {

Background: Diabetes mellitus is a metabolic disorder characterized by chronic hyperglycemia. Plant extracts and their products are being used as an alternative system of medicine for the treatment of diabetes. Aloe vera has been traditionally used to treat several diseases and it exhibits antioxidant, anti-inflammatory, and wound-healing effects. Streptozotocin (STZ)-induced Wistar diabetic rats were used in this study to understand the potential protective effect of A. vera extract on the pancreatic islets. Objective: The aim of the present study was to evaluate the A. vera extract on improvement of insulin secretion and pancreatic β-cell function by morphometric analysis of pancreatic islets in STZ-induced diabetic Wistar rats. Materials and Methods: After acclimatization, male Wistar rats, maintained as per the Committee for the Purpose of Control and Supervision of Experiments on Animals guidelines, were randomly divided into four groups of six rats each. Fasting plasma glucose and insulin levels were assessed. The effect of A. vera extract in STZ-induced diabetic rats on the pancreatic islets by morphometric analysis was evaluated. Results: Oral administration of A. vera extract (300 mg/kg) daily to diabetic rats for 3 weeks showed restoration of blood glucose levels to normal levels with a concomitant increase in insulin levels upon feeding with A. vera extract in STZ-induced diabetic rats. Morphometric analysis of pancreatic sections revealed quantitative and qualitative gain in terms of number, diameter, volume, and area of the pancreatic islets of diabetic rats treated with A. vera extract when compared to the untreated diabetic rats. Conclusion: A. vera extract exerts antidiabetic effects by improving insulin secretion and pancreatic β-cell function by restoring pancreatic islet mass in STZ-induced diabetic Wistar rats.

}, keywords = {Aloe vera, Diabetes, Insulin, Morphometric analysis, Pancreas, Streptozotocin}, doi = {10.4103/pr.pr_75_17}, author = {Ayesha Noor and S Gunasekaran and MA Vijayalakshmi} } @article {299, title = {Synergisms in Alpha-glucosidase Inhibition and Antioxidant Activity of Camellia sinensis L. Kuntze and Eugenia uniflora L. Ethanolic Extracts}, journal = {Pharmacognosy Research}, volume = {9}, year = {2017}, month = {February 2017}, pages = {101-107}, type = {Original Article}, chapter = {101}, abstract = {

Background: Camellia sinensis, the most consumed and popular beverages worldwide, and Eugenia uniflora, a Brazilian native species, have been already confirmed to have beneficial effects in the treatment of diabetes mellitus. However, their potential acting together against an enzyme linked to this pathology has never been exploited. Objective: The aim of this study was to evaluate the inhibitory properties of individual and combined ethanolic extracts of the leaves of C. sinensis and E. uniflora over alpha-glucosidase, a key digestive enzyme used on the Type 2 diabetes mellitus (T2DM) control. In addition, their inhibitory activity against 2,2-diphenyl-1-picrylhydrazyl radical (DPPH{\textbullet}) and peroxyl radicals was also assayed. Materials and Methods: Enzyme inhibition and antioxidant potential were assessed based on in vitro assays. Total phenolic compounds, carotenoids, and chlorophylls A and B were achieved using spectrophotometric methods. Results: E. uniflora was almost 40 times more active on alpha-glucosidase than C. sinensis and combined extracts showed a significant synergistic effect with an obtained IC50 value almost 5 times lower than the theoretical value. C. sinensis extract was twice more active than E. uniflora concerning DPPH{\textbullet}, in contrast, E. uniflora was almost 10 times more effective than C. sinensis on inhibition of peroxyl radicals with a significant synergistic effect for combined extracts. The extracts activities may be related with their phytochemicals, mainly phenolic compounds, and chlorophylls. Conclusion: Combined C. sinensis and E. uniflora ethanolic extracts showed synergistic effect against alpha-glucosidase and lipid peroxidation. These herbal combinations can be used to control postprandial hyperglycemia and can also provide antioxidant defenses to patients with T2DM.

}, keywords = {Additive effect, Antihyperglycemic effect, Antiradical activity, Diabetes, Phytochemicals, Synergistic effect}, doi = {10.4103/0974-8490.197797}, author = {Juliana Vinholes and M{\'a}rcia Vizzotto} } @article {522, title = {Antihyperglycemic and Insulin Secretagogue Activities of Abrus precatorius Leaf Extract}, journal = {Pharmacognosy Research}, volume = {8}, year = {2016}, month = {August 2016}, pages = {303-308}, type = {Original Article}, chapter = {303}, abstract = {

Aim: Abrus precatorius leaves methanolic extract (APME) was evaluated for in vivo antihyperglycemic activity and in vitro insulinotropic effect. Materials and Methods: In vivo antihyperglycemic and insulin secretagogue activities were assessed in streptozotocin-induced diabetic rats by oral administration of APME (200 mg/kg body weight [bw]) for 28 days. In vitro insulin secretion mechanisms were studied using mouse insulinoma beta cells (MIN6-β). In vivo body weight and blood glucose and in vivo and in vitro insulin levels were estimated. Results: In diabetic rats, APME treatment significantly restored body weight (26.39\%), blood glucose (32.39\%), and insulin levels (73.95\%) in comparison to diabetic control rats. In MIN6-β cells, APME potentiated insulin secretion in a dependent manner of glucose (3{\textendash}16.7 mM) and extract (5{\textendash}500 μg/mL) concentration. Insulin secretagogue effect was demonstrated in the presence of 3-isobutyl-1-methyl xanthine, glibenclamide, elevated extracellular calcium, and K+ depolarized media. Insulin release was reduced in the presence of nifedipine, ethylene glycol tetra acetic acid (calcium blocking agents), and diazoxide (potassium channel opener). Conclusion: The study suggests that APME antihyperglycemic activity might involve the insulin secretagogue effect by pancreatic beta cells physiological pathways via K+-ATP channel dependent and independently, along with an effect on Ca2+ channels.

}, keywords = {Calcium, Diabetes, Glibenclamide, insulin secretagogue, K+-ATP channel, mouse insulinoma beta cells}, doi = {10.4103/0974-8490.188881}, author = {Balekari Umamahesh and Ciddi Veeresham} } @article {517, title = {Anti-Advanced Glycation End-product and Free Radical Scavenging Activity of Plants from the Yucatecan Flora}, journal = {Pharmacognosy Research}, volume = {8}, year = {2016}, month = {August 2016}, pages = {276-280}, type = {Original Article}, chapter = {276}, abstract = {

Background: Formation and accumulation of advanced glycation endproducts (AGE) is recognized as a major pathogenic process in diabetic complications, atherosclerosis and cardiovascular diseases. In addition, reactive oxygen species and free radicals have also been reported to participate in AGE formation and in cell damage. Natural products with antioxidant and antiAGE activity have great therapeutic potential in the treatment of diabetes, hypertension and related complications. Objective: to test ethanolic extracts and aqueous-traditional preparations of plants used to treat diabetes, hypertension and obesity in Yucatecan traditional medicine for their anti-AGE and free radical scavenging activities. Materials and Methods: ethanolic extracts of leaves, stems and roots of nine medicinal plants, together with their traditional preparations, were prepared and tested for their anti-AGE and antioxidant activities using the inhibition of advanced glycation end products and DPPH radical scavenging assays, respectively. Results: the root extract of C. fistula (IC50= 0.1 mg/mL) and the leaf extract of P. auritum (IC50= 0.35 mg/mL) presented significant activity against vesperlysine and pentosidine-like AGE. Although none of the aqueous traditional preparations showed significant activity in the anti- AGE assay, both the traditional preparations and the ethanolic extracts of E. tinifolia, M. zapota, O. campechianum and P. auritum showed significant activity in the DPPH reduction assay. Conclusions: the results suggest that the metabolites responsible for the detected radical-scavenging activity are different to those involved in inhibiting AGE formation; however, the extracts with antioxidant activity may contain other metabolites which are able to prevent AGE formation through a different mechanism.

}, keywords = {Antioxidant activity, Diabetes, glycation-end products, Traditional medicine}, doi = {10.4103/0974-8490.188883}, author = {Wendy del C. Dzib-Guerra and Fabiola Escalante-Erosa and Karlina Garc{\'\i}a-Sosa and S{\'e}verine Derbr{\'e} and Patricia Blanchard and Pascal Richomme and Luis M. Pe{\~n}a-Rodr{\'\i}guez} } @article {392, title = {Bio-enhancing Effect of Piperine with Metformin on Lowering Blood Glucose Level in Alloxan Induced Diabetic Mice}, journal = {Pharmacognosy Research}, volume = {8}, year = {2016}, month = {December 2015}, pages = {56-60}, type = {Original Article}, chapter = {56}, abstract = {

Background: Diabetes mellitus is the most rampant metabolic pandemic of the 21st century. Piperine, the chief alkaloid of Piper nigrum (black pepper) is widely used in alternative and complementary therapies has been extensively studied for its bio-enhancing property. Objective: To evaluate the bio-enhancing effect of piperine with metformin in lowering blood glucose levels in alloxan-induced diabetic mice. Materials and Methods: Piperine was isolated from an extract of fruits of P. nigrum. Alloxan-induced (150 mg/kg intraperitoneal) diabetic mice were divided into four groups. Group I (control 2\% gum acacia 2 g/100 mL), Group II (metformin 250 mg/kg), Group III (metformin and piperine 250 mg/kg + 10 mg/kg), and Group IV (metformin and piperine 125 mg/kg + 10 mg/kg). All the drugs were administered orally once daily for 28 days. Blood glucose levels were estimated at day 0, day 14, and end of the study (day 28). Results: The combination of piperine with therapeutic dose of metformin (10 mg/kg + 250 mg/kg) showed significantly more lowering of blood glucose level as compared to metformin alone on both 14th and 28th day (P \< 0.05). Piperine in combination with sub-therapeutic dose of metformin (10 mg/kg + 125 mg/kg) showed significantly more lowering of blood glucose as compared to control group and also showed greater lowering of blood glucose as compared to metformin (250 mg/kg) alone. Conclusion: Piperine has the potential to be used as a bio-enhancing agent in combination with metformin which can help reduce the dose of metformin and its adverse effects.

}, keywords = {Bio-enhancing effect, Diabetes, Metformin, Piperine}, doi = {10.4103/0974-8490.171096}, author = {Shubham Atal and Sarjana Atal and Savita Vyas and Pradeep Phadnis} } @article {482, title = {Oxidative Stress Parameters and Erythrocyte Membrane Adenosine Triphosphatase Activities in Streptozotocin-induced Diabetic Rats Administered Aqueous Preparation of Kalanchoe Pinnata Leaves}, journal = {Pharmacognosy Research}, volume = {8}, year = {2016}, month = {February 2016}, pages = {85-88}, type = {Original Article}, chapter = {85}, abstract = {

Background: Diabetes mellitus is a chronic metabolic disease that according to the World Health Organization affects more than 382 million people. The rise in diabetes mellitus coupled with the lack of an effective treatment has led many to investigate medicinal plants to identify a viable alternative. Objective: To evaluate red blood cell (RBC) membrane adenosine triphosphatase (ATPase) activities and antioxidant levels in streptozotocin-induced diabetic rats administered aqueous preparation of Kalanchoe pinnata leaves. Materials and Methods: Diabetes mellitus was induced in rats by a single administration of streptozotocin (60 mg/kg). Diabetic rats were then treated with aqueous K. pinnata preparation (three mature leaves ~ 9.96 g/70 kg body weight or about 0.14 g/kg body weight/ day) for 30 days. Serum glucose, RBC membrane ATPase activities, and antioxidant levels were determined. Results: We noted weight loss and reduced food consumption in the treated diabetic group. Serum glucose levels were reduced in the treated diabetic group compared to the other groups. Superoxide dismutase activity and glutathione levels were not significantly elevated in the treated group compared to the diabetic group. However, serum catalase activity was significantly (P \< 0.05) increased in the treated diabetic group compared to the other groups. Serum thiobarbituric acid reactive substances were not significantly altered among the groups. There was a significant (P \< 0.05) increase in Mg2+ ATPase activity and a nonsignificant increase in Na+/K+ ATPase activity in the RBC membrane of the treated diabetic group compared to the diabetic group. Conclusion: The consumption of aqueous preparation of K. pinnata may accrue benefits in the management of diabetes by lowering oxidative stress often associated with the disease and improving the availability of cellular magnesium through an increase in the magnesium ATPase pump in the RBC membrane for increased cellular metabolism of glucose through the glycolytic pathway.

}, keywords = {Antioxidant enzymes, Diabetes, Kalanchoe pinnata, red blood cell membrane adenosine triphosphatases}, doi = {10.4103/0974-8490.172656}, author = {Nikhil Menon and Jean Sparks and Felix O. Omoruyi} } @article {397, title = {Acute oral toxicity studies of Swietenia macrophylla seeds in Sprague Dawley rats}, journal = {Pharmacognosy Research}, volume = {7}, year = {2015}, month = {December 2014}, pages = {38-44}, type = {Original Article}, chapter = {38}, abstract = {

Background: Swietenia macrophylla King. (Meliaceae) seeds (SMS); commonly known as sky fruit and locally known in Malaysia as Tunjuk Langit; have been used in traditional Malay medicine for the treatment of diabetes and hypertension. The people eat only a tiny amount of raw seed, weighing not more than 5 mg. Aim: To evaluate the safety of Swietenia macrophylla seeds (SMS) at a single-dose oral administration of 2 g/kg body weight (bw) in sprague dawley (SD) rats. Materials and Methods: Eight-week old male and female SD rats were administered a single-oral dose of 2g/kg bw. The rats{\textquoteright} general behavior, and toxic signs were observed throughout the 14-day study period. The food and water intake by rats and their body weight were monitored during the study period. At the end of the study period, the relative weights of the organs (lung, liver, spleen, heart, kidney, testis, stomach); the hematological and biochemical parameters were measured; the architecture and histology of the organs (liver, kidney and lungs) were observed. Results: Oral administration of SMS to rats did not affect, either food or water intake; relative organ weight of vital organs; the hematological and biochemical parameters; did not show significant changes in the architecture and histology of vital organs. Overall, there were neither signs of toxicity nor deaths recorded during the study period. Conclusion: The rat dose of 2 g/kg bw is equivalent to the human dose of 325 mg/kg bw, which is well below the usual amount consumed by people, did not show any signs of toxicity in rats.

}, keywords = {Diabetes, Sky fruit, Swietenia macrophylla, Toxicity, Traditional Malay medicine, Tunjuk langit.}, doi = {10.4103/0974-8490.147197}, author = {Madhu Katyayani Balijepalli and Velan Suppaiah and An-me Chin and Ayuba Sunday Buru and Sreenivasa Rao Sagineedu and Mallikarjuna Rao Pichika} } @article {528, title = {Cinnamon: Mystic Powers of Minute Ingredient}, journal = {Pharmacognosy Research}, volume = {7}, year = {2015}, month = {June 2015}, pages = {s1-s6}, type = {Review Article}, chapter = {s1}, abstract = {

Cinnamon, due to its exotic flavor and aroma, is a key ingredient in the kitchen of every household. From the beginning of its use in 2800 BC by our ancestors for various purposes such as anointment, embalming and various ailments, it has instigated the interest of many researchers. Recently many trials have explored the beneficial effects of cinnamon in Parkinsons, diabetes, blood, and brain. After extensive research on PubMed and Google scholar, data were collected regarding its antioxidant, anti-inflammatory, antilipemic, antidiabetic, antimicrobial, and anticancer effect. This systematic review underlines the surplus health benefits of this clandestine ingredient and the scope of further research in these clinical scenarios.

}, keywords = {Blood, Cinnamon, Diabetes, Parkinsons}, doi = {10.4103/0974-8490.157990 }, author = {Pallavi Kawatra and Rathai Rajagopalan} } @article {817, title = {Amelioration of Insulin Resistance by Rk 1 + Rg 5 Complex Under Endoplasmic Reticulum Stress Conditions}, journal = {Pharmacognosy Research}, volume = {6}, year = {2014}, month = {August,2014}, pages = {292-296}, type = {Original Article}, chapter = {292}, abstract = {

Background: Diabetes mellitus is a metabolic syndrome exaggerated by stress conditions. Endoplasmic reticulum stress (ERS) impairs the insulin signaling pathway making the diabetic conditions worsen. Pharmacological agents are supplied externally to overcome this malfunction. Ginsenosides from Panax ginseng C.A Meyer possesses many pharmacological properties and are used for the treatment of diabetes. Objective: To investigate the effects of the Rk 1 +Rg 5 complex on the amelioration of insulin resistance in 3T3-L1 cells under endoplasmic reticulum stress conditions. Materials and Methods: Heat-processed ginseng extracts are found to contain many pharmacologically active ginsenosides. Among them Rk 1 +Rg 5 is found to be present in higher concentrations than the other minor ginsenosides. The Rk 1 +Rg 5 complex was tested for its effect in the 3T3-L1 insulin-resistant model and subjected to the MTT assay, glucose oxidase assay and gene expression studies using RT-PCR and real-time PCR under endoplasmic reticulum stress conditions. Results: Rk 1 +Rg 5 treatment is found to increase the glucose uptake into the cells when compared to that of a positive control (tunicamycin treatment group, TM). Further we have analyzed the role at gene expression level. The Rk 1 +Rg 5 complex was found to show an effect on the IGF 2R receptor, CHOP-10, and C/EBP gene at a particular treated concentration (50 μM). Moreover, stress condition (about 50\% decreases) was overcome by the ginsenoside treatments at 50 μM. Conclusion: The present results showed that under endoplasmic reticulum stress conditions Rk 1 +Rg 5 complex exhibits a potential protective role in insulin-resistant 3T3-L1 cells.

}, keywords = {3T3-L1, Dexamethasone, Diabetes, Ginsenosides, Insulin, Insulin resistance}, doi = { 10.4103/0974-8490.138257}, author = {Shree Priya Ponnuraj and Fayeza Siraj, Sera Kang and Hae Yong Noh, Jin-Woo Min and Yeon-Ju Kim and Deok-Chun Yang} } @article {680, title = {Effect of Butea Monosperma Lam. Leaves and Bark Extracts on Blood Glucose in Streptozotocin-induced Severely Diabetic Rats}, journal = {Pharmacognosy Research}, volume = {4}, year = {2012}, month = {december,2011}, pages = {33-36}, type = {Original Article}, chapter = {33}, abstract = {

Background: Diabetes mellitus is a chronic metabolic disorder that has significant impact on the health, quality of life and life expectancy, as well as on the health care system. Butea monosperma Lam. Kuntze (Fabaceae), commonly known as palash, is widely used in the treatment of various diseases and disorders including diabetes. Materials and Methods: The present study was planned to evaluate the antidiabetic effect of aqueous extracts of B. monosperma leaves and bark in streptozotocin-induced severely diabetic rats. The animals were divided into four groups, with each consisting of six rats, viz. control, diabetic control, leaf extract-treated and bark extract-treated groups. Treatment was continued for 6 weeks. The biochemical estimations included blood glucose and serum insulin levels. Histopathology of pancreas was also performed. Results: The results indicated that both leaf and bark extracts of B. monosperma produced insignificant antihyperglycemic activity. The leaf and bark extracts reduced blood glucose to an extent of 28\% and 11\%, respectively. It was also evidenced that both leaf and bark extracts did not increase insulin synthesis or secretion and did not improve pancreatic architecture as reflected by the histopathologic studies. Conclusions: The findings of the study emphasize that B. monosperma does not possess significant antidiabetic activity in severe experimental diabetes at the dosage tested.

}, keywords = {Butea monosperma, Diabetes, Insulin, Pancreas, Streptozotocin}, doi = {10.4103/0974-8490.91032}, author = {Faiyaz Ahmed and NS Siddaraju and M Harish, Asna Urooj and Asna Urooj} } @article {878, title = {Antidiabetic Activity and Phytochemical Screening of Crude extract of Stevia rebaudiana in Alloxan-induced Diabetic Rats}, journal = {Pharmacognosy Research}, volume = {2}, year = {2010}, month = {September 2010}, pages = {258-263}, type = {Original Article}, chapter = {258}, abstract = {

Background: Stevia rebaudiana regulates blood sugar, prevents hypertension and tooth decay. Other studies have shown that it has antibacterial as well as antiviral property. Methods: Preliminary phytochemical screening of aqueous, ether and methanolic extracts of S. rebaudiana was done. Acute and sub-acute toxicity were conducted on twenty four Albino rats, divided into one control (Group I) and three treatment groups viz. aqueous extract (Group II), ether extract (Group III) and methanolic extract (Group IV). For the study of antidiabetic effect of S. rebaudiana rats were divided into seven groups (n=6). Diabetes was induced by a single dose of 5\% alloxan monohydrate (125 mg/kg, i.p.) after 24 hour fasting.Blood samples were analysed on day 0, 1, 5, 7, 14 and 28. Results: Phytochemical tests showed presence of different kinds of phyto-constituents in aqueous, ether and methanol extract of Stevia rebaudiana leaves. Daily single dose (2.0 g/kg) administration of aqueous extract (A.E.) , ether extract (E.E.) and methanol extract (M.E.) for 28 days of S. rebaudiana could not show any significant change in ALT and AST levels in rats. Blood sugar level was found to be decreased on day 28 in groups of rats treated with A.E., E.E. and M.E. of S. rebaudiana. Conclusion: The extracts of Stevioside rebaudiana could decrease the blood glucose level in diabetic rats in time dependent manner.

}, keywords = {Aqueous extract, Diabetes, Ether extract, Methanol extract, Rats, Stevia rebaudiana, Sub-acute toxicity}, doi = {10.4103/0974-8490.69128}, author = {R. S. Kujur, Vishakha Singh and Mahendra Ram and Harlokesh Narayan Yadava and K K Singh and Suruchi Kumari and B. K. Roy} } @article {751, title = {Effect of Dragon Fruit Extract on Oxidative Stress and Aortic Stiffness in Streptozotocin-induced Diabetes in Rats}, journal = {Pharmacognosy Research}, volume = {2}, year = {2010}, month = {March 2010}, pages = {31-35}, type = {Original Article}, chapter = {31}, abstract = {

Cardiovascular complications are consistently observed in diabetic patients across all age groups. The objective of the present study was to investigate the effect of aqueous extract of the fruit pulp of Hylocereus undatus (DFE) on aortic stiffness and oxidative stress in streptozotocin (STZ)-induced diabetes in rats. Twenty-four male, Sprague-Dawley rats were randomized into four groups: I (control), II (diabetic), III (DFE, 250 mg/kg) and IV (DFE 500 mg/kg). Diabetes was induced in groups II, III and IV by intraperitoneal (i.p.) injection of STZ (40 mg/kg). After confirmation of diabetes, group III and IV received DFE for 5 weeks. Pulse wave velocity (PWV) was used as a marker of aortic stiffness and was determined at the end of 5 weeks. DFE significantly decreased ( P \< 0.05) the fasting blood glucose levels in diabetic rats, but not to normal levels. Systolic blood pressure, pulse pressure and PWV were significantly increased ( P \< 0.05) in diabetic rats at the end of 5 weeks in comparison with control group. DFE treatment significantly decreased ( P \< 0.05) these elevations. Oxidative damage was observed in group II after 5 weeks. Plasma malondialdehyde levels significantly decreased ( P \< 0.05), while superoxide dismutase and total antioxidant capacity significantly increased ( P \< 0.05) with DFE treatment in comparison with group II. These data demonstrate that DFE treatment was effective in controlling oxidative damage and decreasing the aortic stiffness measured by PWV in STZ-induced diabetes in rats.

}, keywords = {Arterial stiffness, Diabetes, Hylocereus undatus, Pulse wave velocity, Streptozotocin}, doi = {10.4103/0974-8490.60582}, author = {Kolla R L Anand Swarup and Munavvar A Sattar and Nor A Abdullah and Mohammed H Abdulla and Ibrahim M Salman and Hassaan A Rathore and Edward J Johns} }