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Background Antidiabetic activity of aqueous root extract of Strophanthus hispidus (SHP) was evaluated based on its folklore used in traditional medicine for the treatment of diabetes. Objectives: This study aimed to investigate the in-vitro and in-vivo antidiabetic potential of the aqueous root extract of SHP. Methods SHP (50, 100 and 200 mg/kg p.o.), glibenclamide (5 mg/kg p.o.), normal saline (10 mL/kg; diabetic control) and distilled water (10 mL/kg; normal control) were administered once daily for 28 days, with the measurement of fasting blood glucose level at 7 days interval. Blood samples were collected on day 28 for serum biochemical (albumin, total protein [TP], creatinine, alanine transaminase [ALT], aspartate transaminase [AST], alkaline phosphatase [ALP], triglycerides [TG], total cholesterol [TC], high-density lipoprotein [HDL], low-density lipoprotein [LDL], bilirubin and urea) and hematological assays. The in-vitro antidiabetic activity was investigated using α-amylase and α-glucosidase enzymes inhibitory assays. Results SHP produced a day-dependent reduction in glucose level. Peak reduction (82.94 %; p &lt; 0.05) was produced at the dose of 100 mg/kg. SHP significantly (p &lt; 0.05) increased the level of HDL and TP but significantly (p &lt; 0.05) reduced the levels of TG, LDL, TC, AST, ALT, ALP, bilirubin, creatinine and urea compared with diabetic control rats. Furthermore, SHP significantly (p &lt; 0.05) increased the level of catalase, superoxide dismutase and reduced glutathione compared to diabetic control rats. SHP significantly (p &lt; 0.05) inhibited α-amylase and α-glucosidase enzymes compared with acarbose. Conclusion The findings in this study showed that SHP possesses beneficial antidiabetic activity.

journal of complementary and integrative medicine

Evaluation of  in-vitro  and  in-vivo  antidiabetic, antilipidemic and antioxidant potentials of aqueous root extract of  Strophanthus hispidus  DC (Apocynaceae)