The present study was designed to investigate the antihyperglycemic effects of aqueous and ethanolic extracts
from Gongronema latifolium leaves on glucose and glycogen metabolism in livers of non-diabetic and
streptozotocin-induced diabetic rats. To investigate the effects of aqueous or ethanolic leaf extracts of G. latifolium,
non-diabetic and STZ diabetic rats were treated twice daily (100 mg/Kg) for two weeks. Diabetic rats showed a
significant decrease in the activities of hepatic hexokinase (HK), phosphofructokinase (PFK) and glucose-6-
phosphate dehydrogenase (G6PDH) and an increase in glucokinase (GK) activity. The levels of hepatic glycogen
and glucose were also increased in diabetic rats. However, there were no significant differences in the activities of
glucose-6-phosphatase (G6Pase) in treated and untreated diabetic rats. The ethanolic extract significantly increased
the activities of HK (p < 0.01), PFK (p < 0.001) and G6PDH (p < 0.01) in diabetic rats, decreased the activity of
GK (p < 0.05) and the levels of hepatic glycogen (p < 0.01) and both hepatic (p < 0.001) and blood glucose
(40%). The aqueous extract of G. latifolium was only able to significantly increase the activities of HK and decrease
the activities of GK but did not produce any significant change in the hepatic glycogen and both hepatic and blood
glucose content of diabetic rats. Our data show that the ethanolic extract from G. latifolium leaves has
antihyperglycemic potency, which is thought to be mediated through the activation of HK, PFK, G6PDH and
inhibition of GK in the liver. The ethanolic extract is under further investigation to determine the chemical structure
of the active compound(s) and its/their mechanism of action
The present study was designed to investigate the antihyperglycemic effects of aqueous and ethanolic extractsfrom Gongronema latifolium leaves on glucose and glycogen metabolism in livers of non-diabetic andstreptozotocin-induced diabetic rats. To investigate the effects of aqueous or ethanolic leaf extracts of G. latifolium,non-diabetic and STZ diabetic rats were treated twice daily (100 mg/Kg) for two weeks. Diabetic rats showed asignificant decrease in the activities of hepatic hexokinase (HK), phosphofructokinase (PFK) and glucose-6-phosphate dehydrogenase (G6PDH) and an increase in glucokinase (GK) activity. The levels of hepatic glycogenand glucose were also increased in diabetic rats. However, there were no significant differences in the activities ofglucose-6-phosphatase (G6Pase) in treated and untreated diabetic rats. The ethanolic extract significantly increasedthe activities of HK (p < 0.01), PFK (p < 0.001) and G6PDH (p < 0.01) in diabetic rats, decreased the activity ofGK (p < 0.05) and the levels of hepatic glycogen (p < 0.01) and both hepatic (p < 0.001) and blood glucose(40%). The aqueous extract of G. latifolium was only able to significantly increase the activities of HK and decreasethe activities of GK but did not produce any significant change in the hepatic glycogen and both hepatic and bloodglucose content of diabetic rats. Our data show that the ethanolic extract from G. latifolium leaves hasantihyperglycemic potency, which is thought to be mediated through the activation of HK, PFK, G6PDH and
inhibition of GK in the liver. The ethanolic extract is under further investigation to determine the chemical structure
of the active compound(s) and its/their mechanism of action
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