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Redox regulation in the lens.

Marjorie F Lou¹

¹Redox Biology Center, University of Nebraska-Lincoln, Lincoln, NE 68583, USA. mlou1@unl.edu

Progress in Retinal and Eye Research

|August 2, 2003

Summary

Lens glutathione (GSH) protects proteins from oxidative damage. Two enzymes, thioltransferase (TTase) and thioredoxin (TRx), repair damaged lens proteins, maintaining redox balance and function.

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Area of Science:

Biochemistry
Ophthalmology
Cell Biology

Background:

High glutathione (GSH) levels in the lens protect protein thiols for biological function.
Ageing or oxidative stress diminishes GSH, leading to protein S-thiolation (PSSG, PSSC).
PSSG formation precedes cataract development, causing protein crosslinking and aggregation.

Purpose of the Study:

To investigate the role of thioltransferase (TTase) and thioredoxin (TRx) in repairing oxidatively damaged lens proteins.
To understand the mechanisms of redox homeostasis in the lens.

Main Methods:

Studied H(2)O(2)-induced cataract model in lenses.
Investigated the activity of thioltransferase (TTase) and thioredoxin (TRx) in lens epithelial cells.
Assessed the resistance of TTase to oxidative stress.

Main Results:

Early oxidative damage to protein thiols can be reversed by dethiolation.
Thioltransferase (TTase) repairs protein-S-S-glutathione (PSSG) and restores protein free SH groups.
TTase shows resistance to H(2)O(2) under oxidative stress, unlike other GSH systems.
Thioredoxin (TRx) also repairs oxidatively damaged lens proteins.
TTase and TRx may work synergistically to maintain lens redox balance.

Conclusions:

Thioltransferase (TTase) and thioredoxin (TRx) are key enzymes in repairing oxidative damage in the lens.
These enzymes are crucial for maintaining lens protein function and redox homeostasis.
TTase's resistance to oxidation highlights its importance in protecting the lens from oxidative stress.

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