LABORATORY SCIENCE

8-Isoprostaglandin F_2a and ascorbic acid concentration in the aqueous humour of patients with exfoliation syndrome

G G Koliakos¹, A G P Konstas², U Schlötzer-Schrehardt³, G Hollo⁴, I E Katsimbris⁵, N Georgiadis² and R Ritch⁶

¹ Department of Biological Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
² University Department of Ophthalmology, AHEPA Hospital, Thessaloniki, Greece
³ Department of Ophthalmology, University of Erlangen-Nürnberg, Erlangen, Germany
⁴ 1st Department of Ophthalmology, Semmelweis University, Budapest, Hungary
⁵ Department of Ophthalmology, General Hospital of Patra, Patra, Greece
⁶ Glaucoma Service, Department of Ophthalmology, The New York Eye and Ear Infirmary, New York City, USA

Correspondence to:
Correspondence to:
G Koliakos, MD, PhD, PO Box 17034, 54210 Thessaloniki, Greece;
koliakos{at}med.auth.gr

Background/aim: The authors investigated the concentrations of 8-isoprostaglandin F_2a, a marker of oxidative stress in vivo, and ascorbic acid, a protectant against oxidative damage, in the aqueous humour of patients with exfoliation syndrome (XFS) and cataract and compared the results with those in age matched patients with cataract, but without XFS, to determine whether XFS is associated with increased oxidative stress.

Methods: Aqueous humour was aspirated at the beginning of phacoemulsification cataract surgery from 27 eyes of 27 cataract patients with XFS and 27 eyes of 27 age matched cataract patients without XFS. 8-Isoprostaglandin F_2aconcentration in the aqueous was determined with a commercial immunoassay; ascorbic acid concentration was measured with a microplate assay method.

Results:. The mean concentration of 8-isoprostaglandin F_2ain the aqueous from patients with XFS (2429 (SD 2940) pg/ml; range 400–10500 pg/ml) was significantly higher than that measured in the aqueous of age matched control patients (529.1 (226.8) pg/ml; range 325–1000 pg/ml); (p = 0.0028). Furthermore, mean ascorbic acid concentration in XFS patients (0.75 (0.39) mM; range 0.28–1.70 mM) was significantly lower than that found in control patients (1.19 (0.47) mM; range 0.53–2.4 mM); (p = 0.0005). There was a reverse correlation between 8-isoprostaglandin F_2aand ascorbic acid concentration.

Conclusion: 8-Isoprostaglandin F_2awas significantly increased in the aqueous of patients with XFS, and ascorbic acid was decreased, providing evidence of a role for free radical induced oxidative damage in the pathobiology of XFS.

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