Hr. Andersen et al., LOW ACTIVITY OF SUPEROXIDE-DISMUTASE AND HIGH-ACTIVITY OF GLUTATHIONE-REDUCTASE IN ERYTHROCYTES FROM CENTENARIANS, Age and ageing, 27(5), 1998, pp. 643-648
Objective: to compare the activities of antioxidative enzymes in eryth
rocytes between centenarians and a younger group of elderly subjects.
Design: cross-sectional study. Setting: county of Funen, Denmark. Subj
ects: 41 centenarians aged between 100 and 105 years and 52 community
control subjects aged between 60 and 79 years. Measurements: enzyme ac
tivities of superoxide dismutase (CuZn-SOD), glutathione peroxidase, c
atalase and glutathione reductase (GR) in erythrocytes. Functional cap
acity among the centenarians was evaluated by Katz' index of activitie
s of daily living, the Physical Performance Test and Mini-Mental State
Examination. Results: the mean CuZn-SOD activity was significantly lo
wer and the mean GR activity was significantly higher in centenarians
than in the group of elderly people. The centenarians with the lowest
cognitive and physical functional capacity and who did not survive at
least 1 year after blood sampling tended to have the lowest CuZn-SOD a
ctivities. The range of GR activity was shifted toward higher values i
n the centenarian group than in the younger group and those centenaria
ns having the best functional capacity tended to have the highest GR a
ctivity. Conclusions: CuZn-SOD activity is decreased in centenarians,
probably because of reduced demand for the enzyme at lower metabolic r
ate and oxygen consumption. Subjects with high GR activity occur more
frequently among centenarians than expected, possibly due to their bet
ter survival. The role of GR in disease prevention and as a predictor
for longevity deserves to be further explored.