... also examined the changes of gene expressions of CAT, SOD1, SOD2 and GPx in both young (PDL20 -30 ) and old (PDL >45 ) HDF after 24 hours of treatment with EGCG, since these enzymes are mostly influenced ... expressions both in the young and the old HDF In the young HDF, the gene expressions of CAT, SOD1, SOD2 and GPx increased in response to 25 μM 87 EGCG by 94. 1, 61.9, 44 .6 and 139 .2 % respectively ... that in the untreated group, the gene expressions of CAT, SOD2 and GPx in the young HDF were much higher than that in the old HDF After 24 hours of incubation with EGCG, all the enzymes increased...