Age-dependent effect of UV light in abnormal alpha neoprotein formation in the lens.

Abstract:

:The aim of this study was to determine whether or not alpha neoprotein formation can occur in the lens in response to a photolytic process. Alpha crystallin from young calf and aged bovine lenses was irradiated for up to 22 hours with UV light. After cortical alpha crystallin had been irradiated, it completely preserved its quaternary antigenic determinants. In contrast, 24.3% of the bovine nuclear alpha crystallin completely lost their quaternary determinants as a result of irradiation. The latter population of molecules still preserved the association of A chains with B chains, suggesting the formation of abnormal proteins. The exposure to UV irradiation can cause the formation of alpha neoproteins from aged but not from young alpha crystallin. Comparison of photolytic rates based on spectroscopic and chromatographic parameters also show an age-related increase in the susceptibility of alpha crystallin to photolyze. It is suggested that this increase is due to the age-related formation of a photosensitizer in alpha crystallin.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Hibino K,Du J,Dillon J,Malinowski K

doi

10.3109/02713688809001882

subject

Has Abstract

pub_date

1988-11-01 00:00:00

pages

1113-24

issue

11

eissn

0271-3683

issn

1460-2202

journal_volume

7

pub_type

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