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Background In West Africa, the fruit, seed, leaf and stem of Blighia sapida K.D. Koenig are commonly used as remedy against a variety of diseases, including diabetes mellitus. This study investigated the ameliorative potential of B. sapida K.D. Koenig stem bark ethanol extract against pancreatic β-cell dysfunction in diabetic rats. Methods Diabetes was induced by intraperitoneal injection of alloxan (65 mg/kg body weight) for 21 days, and orally administered with glibenclamide (5 mg/kg body weight), 50-150 mg/kg body weight of B. sapida stem bark ethanol extract once daily for 21 days. Results The blood glucose levels of rats induced with alloxan were significantly and gradually reduced (p<0.05) in B. sapida stem bark ethanol extract treated animals at the dose of 50-150 mg/kg body weight, and in glibenclamide-treated animals. The significant increase in the lipid peroxidation (malonaldehyde), homeostasis model assessment-insulin resistance scores (HOMA-IR) and decrease in serum insulin, pancreatic β-cell scores as well as antioxidant marker enzymes in untreated diabetic rats compared to normal control rats were reversed by the B. sapida stem bark ethanol extract and glibenclamide. Similarly, histopathological changes in the pancreas were also reversed by the extract and glibenclamide. However, these effects were most prominent in the animals treated with 150 mg/kg body weight of B. sapida bark. Conclusions These findings indicate that B. sapida stem bark possess anti-hyperglycemic activity and exhibits ameliorative potential in managing diabetes.

Background and aim:In Africa, the fruit, seed, leaf, and stem of Blighia sapida K.D. Koenig are used as remedy for a range of diseases. This study characterized the phytochemicals, assessed the antioxidant and inhibitory properties of the stem bark of Blighia sapida. Materials and methods: Samples were consecutively extracted using ethanol solvent and investigated for phenol content, DPPH radical scavenging abilities, iron chelation, reducing power, α-amylase and α-glucosidase activities as markers of in vitro anti-diabetic activities. Phytochemicals were analyzed using gas chromatography-mass spectrometry (GC-MS) analysis. Results: The extract had radical scavenging capabilities, iron chelation and reducing power. Furthermore, the results reveal the extract had considerably high α-glucosidase and α-amylase inhibitory activities as the concentration increases with IC 50 values of 4.17 ± 0.24 mg/mL and 5.30 ± 1.25 mg/mL, respectively. Enzyme kinetic studies indicated that the extract displayed uncompetitive inhibitor for α-glucosidase and was a competitive inhibitor of α-amylase. The ethanolic extract is rich in several aromatic phenolic compounds and long chain aliphatic acids. Conclusion: These results reveal the bark possessed antioxidant as well as α -glucosidase and α -amylase inhibitory activities.

Purpose: Diabetes mellitus is one of the major endocrine disorders, characterized by impaired insulin action and deficiency. Traditionally, Artocarpus heterophyllus stem bark has been reputably used in the management of diabetes mellitus and its complications. The present study evaluates the ameliorative activity of ethanol extract of Artocarpus heterophyllus stem bark in alloxan-induced diabetic rats.Methods: Diabetes mellitus was induced by single intraperitoneal injection of 150 mg/kg body weight of alloxan and the animals were orally administered with 50, 100 and 150 mg/kg body weight ethanol extract of Artocarpus heterophyllus stem bark once daily for 21 days.Results: At the end of the intervention, diabetic control rats showed significant (p<0.05) weight reduction, abnormal haematological parameters, high serum lipids (except high density lipoprotein) concentrations, increased creatinine, bilirubin and urea levels with decreased in albumin level when compared with non-diabetic control rats. All these alterations were reverted to normal after administered with different doses of ethanol extract of Artocarpus heterophyllus stem bark most especially at 150 mg/kg body weight which exhibited no significant (p>0.05) different with non-diabetic rats.Conclusion: The results suggest that ethanol extract of Artocarpus heterophyllus stem bark may be useful in ameliorating complications associated with diabetes mellitus patients.

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