Hypoglycemic effect of Aemotoxylon campechanum on streptozotocin (STZ)-induced diabetic rats Hypoglycemic effect of Aemotoxylon campechanum on streptozotocin (STZ)-induced diabetic rats

Aemotoxylon campechanumの血糖降下作用をSTZ誘発糖尿病ラットを用いて検討したところ,水エキスが空腹時血糖を有意かつ用量依存的に低下させた。そこで,水エキスをメタノール可溶性フラクション及び水溶性フラクションに分画したところ,メタノール可溶性フラクションがより強い作用を示し,100mg/kgの腹腔内投与で空腹時血糖値を37%低下させた。また,水エキス200mg/kg及びメタノール可溶部100mg/kgは空腹時血糖値を35.1%低下させた陽性コントロールとして用いたtolbutamide(100mg/kg)とbuformin(1mg/kg)の混合物よりも強いものであった。最後に,この活性フラクションの分離を行ない,グアイアン型セスキテルペン5種及びクマリン誘導体1種を単離・同定した。

Hypoglycemic activity of Aemotoxylon campechanum was examined in STZ-induced diabetic rats. The water extract of A. campechanum lowered fasting blood glucose level of STZ-induced diabetic rats significantly and dosedependently. The water extract further divided into MeOH and H_2O-soluble fractions. The MeOH-soluble fraction showed the strongest hypoglycemic effect, which lowered fasting blood glucose level by 37% at a dose of 100 mg/kg (i. p.). The water extract and the MeOH-soluble fraction were found to be more effective in lowering the blood glucose level of diabetic rats than the mixtures of tolbutamide (200 mg/kg) and buformin (1 mg/kg) used as positive control, which lowered blood glucose level by 35.1%. The active fraction led to isolation of five guainane-type sesquiterpenes and a coumarin derivative.