[Effects of flavones of buckwheat flower and leaf on insulin resistance and liver PTP1B in type 2 diabetic rats].

OBJECTIVE: To explore the effect and mechanism of flavones of buckwheat flower and leaf (FBFL) on lowering blood glucose and improving insulin resistance in type 2 diabetic rats. METHOD: Seventy healthy male Wistar rats were used in this trial. Ten of them were selected randomly as normal group; the others were given fat milk by intragastric administration daily, from the 14th day on, low dose tetraoxypyrimidine was added by intraperitoneal injection every other day for three times. Rats with fasting (72 hours after the last injection) blood sugar > or = 16.7 mmol x L(-1) and K(IPT) < 60% of normal group were selected as type 2 diabetic model with insulin resistance, which were randomly divided into 5 groups: model group. LGLT group; low, moderate and high dosage FBFL groups (L-FBFL; M-FBFL; H-FBFL). Every rat was treated accordingly for 4 weeks; then FBG, FFA, INS were detected and ISI was calculated to evaluate the degree of insulin resistance. Liver PTP1B expression was determined by immunohistochemistry method. staining were observed by light microscopy. RESULT: FBFL could dose-dependently inhibit the rising of FBG, FFA, INS, improve the state of insulin resistance and reduce the expression level of liver PTP1B. CONCLUSION: FBFL could effectively improve insulin resistance in type 2 diabetic rats induced by tetraoxypyrimidine and fat milk and showed dose-dependence relationship.