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[Reduced glutathione level and GSH-dependent enzyme activities in corticonuclear blocks of lenses in patients with senile cataract].

Abstract：

INTRODUCTION:Reduced compound glutathione (GSH) in the lens has the function to protect the thiol group of lens proteins, and as a substrate of glutathione peroxidase (GPx) and glutathione S-transferase (GST). Protein containing thiol groups is significant for the normal function of lens epithelium, i.e. enzymes Na-K-ATP-ase, thus influencing cell permeability. The relationship GSH/GSSG (oxidized glutathione) is normally high in the lens and other ocular tissue owing to the glutathione-redox cycle, which is localized in the lens epithelium and cortex surface. OBJECTIVE:The aim of the study was to investigate non-enzymic factors of the antioxidant protection of non-protein and protein tiol, as well as to determine glutathione-dependent enzyme activity in the corticonuclear blocks of lenses in patients with senile cataract. METHODS:Biochemical studies of lens were carried on 101 patients with senile cataract. According to cataract maturity degree, the patients were classified into two groups: senile incipient cataract (N = 41) and mature senile cataract (N = 60). GSH concentration was determined by Ellman's reagent. GPx activity was assayed with cumene hydroperoxide, and that of glutathione S-transferase by follow-up of glutathione conjugation and 1-chloro-2.4-dinitrobenzene rates. RESULTS:A significantly higher GSH concentration was found in the corticonuclear blocks of lenses with initial as related to mature cataract (p < 0.001). The activity of enzyme GPx and GST was considerably higher in the corticonuclear blocks of lenses with initial cataract (p < 0.001). With cataract progression, the quantity of available GSH, necessary for GPx and GST functioning, declined, so that the activity of these enzymes was also significantly decreased in mature cataract. CONCLUSION:The determined lower GSH concentration and antioxidant enzyme activity in corticonuclear blocks of lenses, particularly in cataract with a nuclear component, indicate the weakened antioxidant response of lens tissue during the development of senile cataract.

journal_name

Srp Arh Celok Lek

journal_title

Srpski arhiv za celokupno lekarstvo

authors

Kisić B,Mirić D,Žorić L,Ilić A,Dragojević I

doi

10.2298/sarh1210563k

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

563-70

issue

9-10

eissn

0370-8179

issn

2406-0895

journal_volume

140

pub_type

杂志文章

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[Reduced glutathione level and GSH-dependent enzyme activities in corticonuclear blocks of lenses in patients with senile cataract].