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        Hypoglycaemic and anti-hyperglycaemic activity of Tabernanthe iboga aqueous extract in fructose-fed streptozotocin type 2 diabetic rats

        Bading-Taïka Bayissi,Souza Alain,Bourobou Bourobou Henri-Paul,Lione Lisa A. 경희대학교 융합한의과학연구소 2021 Oriental Pharmacy and Experimental Medicine Vol.21 No.2

        Root bark preparations of the Gabonese plant Tabernanthe iboga (T. iboga) has long been used in traditional medicine in Central and West African regions for the management of type 2 diabetes (T2D). This study is the first investigation of in vivo hypoglycaemic activity in healthy rats and anti-hyperglycaemic activity of T. iboga in a 10% fructose-fed (40 mg/kg i.p.) streptozotocin (STZ) injected type 2 diabetic rat model. T. iboga at 50 to 200 mg/kg induced hypoglycaemia activ-ity over 3 h fasted glucose tolerance in healthy Wistar rats and anti-hyperglycaemic effects on non-fasted and fasted blood glucose in fructose-fed STZ T2D rats with no toxicity. Fructose-fed STZ T2D rats developed characteristic type 2 diabetic complications over 6 weeks exhibiting significantly elevated fasting and non-fasting blood glucose, polydipsia, reduced body weight gain and glucose and insulin tolerance compared with STZ alone and normal control rats. T. iboga (50 mg/kg and 200 mg/kg bw) administered p.o. once daily for 4 weeks significantly improved diabetic symptoms of polydipsia, reduced body weight, hyperglycaemia, glucose and insulin tolerance (as AUC) compared with fructose-fed STZ T2D rats. T. ibogaaqueous extract (50 mg/kg and 200 mg/kg) also significantly reversed altered actions of marker enzymes of liver including alkaline phosphatase (ALP), alanine transaminase (ALT), aspartate transaminase (AST), creatinine, HbA1c and elevated triglycerides in fructose-fed STZ type 2 diabetic rats. Our outcomes show that daily oral provision of T. iboga improves type 2 diabetes complications, superior to glibenclamide, in rat fructose-fed STZ model and offers the potential for safe clinical management of T2D in Gabon.

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