Damage of photoreceptor membrane lipids and proteins induced by photosensitized generation of singlet oxygen.

Abstract:

:It has been shown that illumination of rod outer segment suspension in the presence of photosensitizers (methylene blue lambda greater than or equal to 620 nm; retinal 370 less than or equal to lambda less than or equal to 390 nm) results in chemical modification of the lipid and protein components of the photo-receptor membranes. This modification can be registered by accumulation of lipid peroxidation (LPO) products as well as oligomerization of rhodopsin and a decrease of rhodopsin thermal stability. These effects are prevented by 'O2-quenchers and free radical scavengers. It has been found that the electric activity (ERG) of isolated frog retina is inhibited due to photosensitized generation of 'O2 which can be overcome by preliminary addition of 'O2-quenchers and free radical scavengers to the incubation medium. The LPO products are accumulated in the retinae of rats exposed to high intensity light in vivo. It is concluded that 'O2 and LPO are involved in light-induced damage of the retina.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Shvedova AA,Alekseeva OM,Kuliev IYa,Muranov KO,Kozlov YuP,Kagan VE

doi

10.3109/02713688209019997

subject

Has Abstract

pub_date

1982-01-01 00:00:00

pages

683-9

issue

10

eissn

0271-3683

issn

1460-2202

journal_volume

2

pub_type

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