Open AccessDynamic thiol/disulfide homeostasis in patients with age-related macular degeneration
Author(s) -
Serdar Aktaş,
Hacı Murat Sağdik,
Mehm et Tetikoğlu,
Hatice Aktaş,
Fatih Özçura,
Fatma Uçar,
Murat Alışık,
Merve Ergin
Publication year - 2017
Publication title -
arquivos brasileiros de oftalmologia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 29
eISSN - 1678-2925
pISSN - 0004-2749
DOI - 10.5935/0004-2749.20170057
Subject(s) - thiol , malondialdehyde , macular degeneration , catalase , oxidative stress , medicine , homeostasis , mann–whitney u test , endocrinology , chemistry , biochemistry , ophthalmology
Purpose: We evaluated dynamic thiol/disulfide homeostasis (TDH), malondialdehyde (MDA) levels, and catalase (CAT) activity in patients with age-related macular degeneration (AMD). All analyzes were conducted on plasma samples. Methods: Thirty-two patients with AMD and 38 age-matched healthy controls were included. Native thiol, total thiol, and disulfide levels and TDH status were determined using a novel, automated assay. MDA levels and CAT activity were determined. Percentages were compared using the chi-squared test. The Student's t-test and Mann-Whitney U-test were used to compare quantitative variables. Results: Native thiol levels were significantly lower (p=0.004) in patients with AMD (272.02 ± 52.41 µmol/l) than in healthy individuals (307.82 ± 47.18 µmol/l), whereas disulfide levels were significantly higher (p<0.001) in patients with AMD than in controls (21.64 ± 5.59 vs. 14.48 ± 5.37 µmol/L). Dynamic TDH was also significantly lower (p<0.001) in patients with AMD than in controls (13.41 ± 4.3 vs. 25.41 ± 14.52 µmol/l). No significant differences were evident in total thiol or MDA levels. Mean CAT activity was significantly higher (p=0.043) in patients with AMD compared with controls (0.035 vs. 0.018 k/ml). Conclusions: The antioxidant/oxidant balance demonstrated by dynamic TDH is shifted to the oxidative side in patients with AMD