OBJECTIVES: Increased oxidative stress has been hypothesized to play an important role in the aging process. A role for oxidative damage in normal aging is supported by studies in experimental animals, but there is limited evidence in humans. To investigate the relationship between the oxidative stress and aging in humans, we determined lipid and protein oxidation in plasma as well as DNA damage in lymphocytes in young and elderly subjects. DESIGN AND METHODS: 55 healthy subjects were divided into young (21-40 years) and elderly (61-85 years) groups. Plasma malondialdehyde (MDA), protein carbonyl (PC) levels, and grade of DNA damage in lymphocytes using comet assay as well as total ferric reducing antioxidant power (FRAP) in plasma were determined in young and elderly subjects. RESULTS: Plasma MDA and PC levels were found to be increased in plasma of elderly subjects as compared to young subjects. Increases in endogenous and H2O2-induced DNA damage were also observed in lymphocytes of elderly subjects. In addition, we detected a significant decrease in FRAP values in elderly subjects. Plasma MDA, PC levels and endogenous and H2O2-induced DNA damage were positively correlated with aging, but negatively with FRAP values. CONCLUSION: We evaluated MDA, PC levels and lymphocyte DNA damage altogether in both young and elderly subjects for the first time. The results of this study strongly support the presence of increased oxidative stress in elderly subjects.
OBJECTIVES: Increased oxidative stress has been hypothesized to play an important role in the aging process. A role for oxidative damage in normal aging is supported by studies in experimental animals, but there is limited evidence in humans. To investigate the relationship between the oxidative stress and aging in humans, we determined lipid and protein oxidation in plasma as well as DNA damage in lymphocytes in young and elderly subjects. DESIGN AND METHODS: 55 healthy subjects were divided into young (21-40 years) and elderly (61-85 years) groups. Plasma malondialdehyde (MDA), protein carbonyl (PC) levels, and grade of DNA damage in lymphocytes using comet assay as well as total ferric reducing antioxidant power (FRAP) in plasma were determined in young and elderly subjects. RESULTS: Plasma MDA and PC levels were found to be increased in plasma of elderly subjects as compared to young subjects. Increases in endogenous and H2O2-induced DNA damage were also observed in lymphocytes of elderly subjects. In addition, we detected a significant decrease in FRAP values in elderly subjects. Plasma MDA, PC levels and endogenous and H2O2-induced DNA damage were positively correlated with aging, but negatively with FRAP values. CONCLUSION: We evaluated MDA, PC levels and lymphocyte DNA damage altogether in both young and elderly subjects for the first time. The results of this study strongly support the presence of increased oxidative stress in elderly subjects.
Authors: Jeroen Frijhoff; Paul G Winyard; Neven Zarkovic; Sean S Davies; Roland Stocker; David Cheng; Annie R Knight; Emma Louise Taylor; Jeannette Oettrich; Tatjana Ruskovska; Ana Cipak Gasparovic; Antonio Cuadrado; Daniela Weber; Henrik Enghusen Poulsen; Tilman Grune; Harald H H W Schmidt; Pietro Ghezzi Journal: Antioxid Redox Signal Date: 2015-10-26 Impact factor: 8.401
Authors: Heike Gruber; Wiebke Wessels; Primrose Boynton; Jinze Xu; Stephanie Wohlgemuth; Christiaan Leeuwenburgh; Wenbo Qi; Steven N Austad; Ralf Schaible; Eva E R Philipp Journal: Age (Dordr) Date: 2015-08-29
Authors: Madlyn I Frisard; Amanda Broussard; Sean S Davies; L Jackson Roberts; Jennifer Rood; Lillian de Jonge; Xiaobing Fang; S Michal Jazwinski; Walter A Deutsch; Eric Ravussin Journal: J Gerontol A Biol Sci Med Sci Date: 2007-07 Impact factor: 6.053