Background: Annona muricata has been used in folklore in the management of diabetes. A major strategy in decreasing postprandial hyperglycemia in diabetes involves the inhibition of carbohydrate-hydrolyzing enzymes-αamylase and α-glucosidase. Thus, this study evaluated the in vivo and in vitro inhibitory potentials of the different parts (fruit-pulp, leaf, stem-bark and root-bark) of Annona muricata. Methods: A total of 120 Wistar rats were treated with methanol extracts for 28 days after which blood and tissue samples were collected for α-amylase assay. In vitro inhibitory properties of methanol, ethyl acetate and dichloromethane extracts of the various parts of the plant on α-amylase and α-glucosidase activities were performed using standard procedures. The mode and mechanism of interactions between the enzymes and extracts (and isolated acetogenin) were determined using various kinetic interpolations and in silico experiments. Result: The fruit-pulp and root-bark methanolic extracts better-inhibited plasma and tissue amylase in vivo. The in vitro studies revealed that the stem-bark methanolic, fruit-pulp ethyl acetate, and leaf dichloromethane extracts, better inhibited α-amylase activity compared with the standard acarbose. Also, the leaf methanol, fruit-pulp ethyl acetate, and root-bark dichloromethane extract better inhibited α-glucosidase activity. These observations were corroborated with their higher Bmax and Vmax and lower Kd values. All the extracts exhibited an "uncompetitive" type of inhibition pattern. Also, the isolated acetogenin (15-acetyl guanacone) from the fruit-pulp showed a better binding affinity compared to the standard drug, Metformin. Conclusion: Better natural remedy for diabetics can be obtained from Annona muricata with minimal or no adverse side effects.
Background:
In recent times, medicinal plants has been explored for their ameliorating effect on Cadmium induced organ toxicity in Wistar rats.
Aims and Objectives:
This study investigates the protective effects of aqueous extract of Cyperus esculentus (tiger nut) on cadmium-induced biochemical and histological alterations in heart of rats.
Materials and Methods:
Thirty male wistar rats were randomly divided into six groups (A-F). Blood samples were collected from the animals after treatment with cadmium (10mg/kg body weight) and varying doses (150, 300, 600mg/kg B.W) of aqueous extract of Cyperus esculentus for 60 days for evaluation of antioxidant status and hematological parameters. Sections of the heart and aorta were examined for histological alterations.
Results:
Treatment with extract of Cyperus esculentus resulted in a significant increase (P<0.05) in superoxide dismutase, catalase and gluthathione peroxidase activities and a significant reduction in malondialdehyde level when compared to the untreated animals. However, the alterations observed in the hematological parameters were not improved on treatment with Cyperus esculentus.
Conclusion:
Treatment with medium (300mg/kg B.W) and high (600mg/kg B.W) of Cyperus esculentus reversed the histological alterations observed in the heart and aorta of the untreated animals. The study demonstrated that aqueous extract of Cyperus esculentus can protect against oxidative stress resulting from cadmium toxicity.
How to cite this article:Eluehike N, Onoagbe I. Changes in organ and body weight, serum amylase and antidiabetic effects of tannins from Spondias mombin on streptozotocin-induced diabetic rats.
Background: Diabetes Mellitus (DM) is a metabolic disorder characterised by chronic hyperglycaemia due to the body’s inability to appropriately metabolism and utilize carbohydrates (sugars), further affecting protein and lipid metabolism, as a result of inadequate insulin release due to damaged pancreatic beta-cells (type 1 diabetes) or reduced tissue insulin sensitivity and elevated blood insulin (type 2 diabetes) – endocrine disorder. The possible anti-DM properties of Spondias mombin and Nigella sativum where investigated.Materials and methods: Four (4) groups ten (10) adult Wistar rats were induced with streptozotocin (STZ) to cause a pathologic DM condition after which they were treated with metformin (positive control drug, PC), Spondias mombin methanolic extract (T1) and Nigella sativum oil (T4) for twenty-eight days. The normal control (NC) and diabetic control (DC) received distilled water and STZ. Gene expression studies and molecular docking (post-gene expression) analyses were carried out on key factors involved in DM; lipid and glucose homeostasis (peroxisome proliferator-activated receptors, PPAR-γ), transport proteins (GLUT 1 to 5), proteins of inflammatory reactions (interleukin-1-beta, IL-1β; tumour necrosis factor-alpha-1), enzymes involved in glycolysis (phosphofructokinase-1, PFK-1).Results: It was observed that Spondias mombin, Nigella sativum, and metformin positively influenced the gene expression and post-gene expression phases to ameliorate the DM conditions.Conclusion: Spondias mombin performed better than Nigella sativum and metformin as a potential anti-DM plant.
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