title: Accumulation of 8-hydroxydeoxyguanosine and its relationship with antioxidant parameters in patients with Eales' disease: implications for antioxidant therapy.
abstract: OBJECTIVE
  Eales' disease (ED) is an idiopathic retinal inflammatory disease, which affects the retina of young adult males. Oxidative stress has been associated with the development of various inflammatory diseases. Accumulation of DNA oxidation products has been considered as an early biomarker for assessing oxidative tissue damage. To our knowledge there are no human clinical reports available on the accumulation of DNA adducts in ocular inflammatory diseases. Hence the aim of the present study was to determine the levels of 8-hydroxy-2'deoxyguanosine (8-OHdG) and to correlate it with the antioxidant and oxidant parameters in patients with ED and healthy control subjects.
  
  
  METHODS
  Twenty-two patients with ED [12 in active perivasculitis (AV) and 10 in healed vasculitis stages (HV)] were recruited for the study. 14 healthy volunteers were included as control. 8-OHdG was determined in their leukocytes by Gas chromatography-Mass Spectrometry (GC/MS) technique. Glutathione levels were determined in plasma, while Superoxide dismutase (SOD) activity and thiobarbituricacid reactive substances (TBARS) content were determined in their erythrocytes.
  
  
  RESULTS
  Our results indicated that 8-OHdG levels were elevated by 3 and 1.9 folds respectively in AV and HV stages of patients with ED, when compared with healthy control subjects. Increased 8-OHdG levels correlated with diminished SOD activity and decreased GSH content in patients with ED.
  
  
  CONCLUSIONS
  To our knowledge, this is the first report of DNA adduct accumulation in patients with ED. Increased DNA adduct accumulation correlated with the severity of the disease, and they lie in parallel with diminished antioxidant capacity observed in patients with ED. Based on the observations from our present work and our earlier studies, we reiterate that oxidative stress is involved in the disease process. Hence we believe antioxidant vitamin E and C supplementation might be beneficial to patients with ED.
authors: Biochemistry Research Department, Vision Research Foundation, Sankara Nethralaya, Chennai, India.
authors: Mohanraj
authors: M
authors: Rajesh
authors: Atmakuru
authors: A
authors: Ramesh
authors: Perumal Elumalai
authors: PE
authors: Ravi
authors: Prakhya
authors: P
authors: Balakrishnamurthy
authors: Karunakaran
authors: K
authors: Coral
authors: Ranganathan
authors: R
authors: Punitham
authors: Konerirajapuram N
authors: KN
authors: Sulochana
authors: Joytirmay
authors: J
authors: Biswas
authors: Sivaramakrishnan
authors: S
authors: Ramakrishnan
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D000328:Adult; D000975:Antioxidants / Q000627:therapeutic use*; D004247:DNA / Q000302:isolation & purification; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000378:metabolism*; D004910:Erythrocyte Membrane / Q000378:metabolism; D008401:Gas Chromatography-Mass Spectrometry; D005978:Glutathione / Q000097:blood*; D006801:Humans; D007962:Leukocytes / Q000737:chemistry; D008297:Male; D031300:Retinal Vasculitis / Q000188:drug therapy / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000097:blood*; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D017392:Thiobarbituric Acid Reactive Substances; D000080242:8-Hydroxy-2'-Deoxyguanosine; D004247:DNA; D013482:Superoxide Dismutase; D003849:Deoxyguanosine; D005978:Glutathione