RESUMO
Objective To investigate induction effect of AGE on oxidative stress and type Ⅰ ,Ⅲcollagen synthesis in rat cardiac fibroblasts and interference effect of RGZ during the course. Methods Incubate rat cardiac fibroblasts with AGE of different concentration ,add RGZ to interfere for 48 h ,and then collect supernatant fluid .Superoxide dismutase (SOD) activity and malondialdehyde (MDA) content were detected by SOD kit and MDA kit separately ,and type Ⅰ ,Ⅲ collagen contents were measured by ELISA. Results When incubating cardiac fibroblasts with RGZ and 200 mg/L AGE together for 48 h , with the rise of RGZ concentration(0.1 ,1 and 10 mol/L) ,SOD activity in the supernatant fluid of cultured cardiac fibroblasts gradually increased [(21.564 ± 1.614) ,(22.323 ± 1.260) ,(23.661 ± 1.562) vs (19.320 ± 0.896) nU/ml ,P<0.05 or P<0.01] ,MDA content gradually decreased [(1.325 ± 0.048) ,(1.279 ± 0.032) ,(1.229 ± 0.045 ) vs (1.629 ± 0.043 ) nmol/ml ,P< 0.01 ] and type Ⅰ ,Ⅲ collagen Contents gradually decreased [(79.17 ± 3.25) ,(60.42 ± 3.58) ,(42.71 ± 5.11) vs (85.54 ± 2.28) ng/ml ,P<0.01 ;(37.52 ± 3.43) ,(27.09 ± 4.75) ,(20.81 ± 3.26) vs (40.75 ± 2.70) ng/ml ,P<0.01] as compared with 200 mg/L AGE group. Conclusion AGE can induce oxidative stress in cardiac fibroblasts and increase type Ⅰ ,Ⅲ collagen contents .RGZ can inhibit oxidative stress in cardiac fibroblasts and synthesis and secretion of type Ⅰ ,Ⅲ collagen induced by AGE. This finding indicates that RGZ may play an important role in the prevention of diabetic myocardial fibrosis.