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The study aims to investigate the effect of aqueous fruit pulp of Dialium guineense on hemeoxygenase, and insulin release, inhibition of angiotensin converting enzyme (ACE) and possible hypoglycemia in streptozotocin-induced diabetic rats. Twenty four male Wistar rats were grouped into control, diabetic (Dm), diabetic + 300 mg/kg body weight Dialium guineese (Dm+ DG) and diabetic + 100 mg/kg metformin (Dm +MET). Apart from the control, other rats were made diabetic by a single dose of 50 mg/kg streptozotocin injected intraperitoneally. Dialium and metformin were administered orally three days after induction of diabetes. Result showed significant (p<0.01) increase in serum ACE, blood glucose, and a decrease (p<0.01) in HO-1 and insulin in the Dm group. There was also an increase (p<0.01) in TC, TG and LDL-c. Tissue peroxidation (Heart and Kidney) was high in the diabetic untreated rats, superoxide dismutase and catalase activity was attenuated. Administration of aqueous fruit pulp and metformin significantly (p<0.001) increased HO-1 and insulin secretion, decreased ACE and blood sugar level (p<0.001) as well as the TC, TG and LDL-c. Antioxidant activities in the kidney and liver were potentiated. In conclusion, this study showed that Dialium guineese fruit pulp enhances HO-1 and insulin release and inhibits ACE activity. It is hypoglycemic, hypolipidemic and evokes antioxidant activity.   Key words: Hemeoxygenase-1 (HO-1), angiotensin converting enzyme (ACE), insulin, diabetes, Dialium guineese, metformin.

In vivo efficacy of Dialium guineense fruit pulp on hemeoxygenase-1 and angiotensin converting enzyme in experimental diabetes