[Effects of triterpenoid from Psidium guajava leaves ursolic acid on proliferation, differentiation of 3T3-L1 preadipocyte and insulin resistance].

Objective: To investigate the influences of triterpenoid from Psidium guajava Leaves (ursolic acid) on the proliferation, differentiation of 3T3-L1 preadipocyte, and its possible mechanism treat for insulin resistance.

Methods: 3T3-L1 preadipocyte was cultured in vitro. After adding ursolic acid to the culture medium for 48h, the cell viability was tested by MTT assay.

[Nephro-protective effects of total triterpenoids from Psidium guajava leaves on type 2 diabetic rats].

Objective: To investigate the nephro-protective effects of total triterpenoids from Psidium guajava leaves (TTPGL) on type 2 diabetic rats.

Methods: Diabetic rats were induced by intraperitoneal injection of streptozotocin (STZ, 35 mg/kg) and a high-fat diet. Diabetic rats were divided into five groups: diabetic model control, low-dose TTPGL-treated (60 mg/kg, L-TTPGL), medium-dose TTPGL-treated (120 mg/kg, M-TTPGL), high-dose TTPGL-treated (240 mg/kg, H-TTPGL) and rosiglitazone-treated (3 mg/kg, RSG).