Effects of three kinds of curcuminoids on anti-oxidative system and membrane deformation of human peripheral blood erythrocytes in high glucose levels.

BACKGROUND/AIMS Curcuminoids are the main bioactive constituents of the rhizome of turmeric. Erythrocytes lesions in diabetes are probably related to hyperglycemia and protein glycation. It has been reported that curcumin prevent lipid peroxidation. However, reports on the effects of demethoxycurcumin and bis-demethoxycurcumin on human erythrocytes at high glucose levels are scarce. Our aim is to investigate the effect of curcuminoids on oxidative stress and membrane of erythrocytes exposed to hyperglycemic condition. METHODS In this study, the different blood samples were treated with two doses of glucose (10 or 30 mM) to mimic hyperglycemia in the presence or absence of three kinds of curcuminoids (5 or 10 μM) in a medium at 37 °C for 24 h (Each experiment consists of 20 blood samples from 10 male and 10 female volunteers). The malondialdehyde was checked by HPLC, antioxidase (GSH and GSSG) were measured by LC/MS, SOD was checked by WST-1 kit, morphology and phospholipid symmetry were detected by flow cytometry, confocal scanning microscope and scanning electron microscope. RESULTS The results illustrated that all three curcuminoids reduce oxidative stress damage on the membrane and maintain a better profile for erythrocytes. Furthermore, three curcuminoids had benefit effects on antioxidase. CONCLUSION The three kinds of curcuminoids supplementation may prevent lipid peroxidation at different intensity and membrane dysfunction of human erythrocytes in hyperglycemia.