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The physiological consequences of glutathione variations
Life Sciences
|January 1, 1992
Summary
Glutathione (GSH) protects cells from oxidative stress and toxins. Severe depletion, especially in mitochondria, can cause toxicity, justifying GSH substitution in diseases like liver dysfunction or AIDS.
Area of Science:
- Biochemistry
- Cell Biology
- Pathophysiology
Background:
- Glutathione (GSH) is a critical intracellular thiol involved in cellular defense.
- GSH plays vital roles in protecting against oxidative stress, maintaining thiol homeostasis, and detoxifying xenobiotics.
- The clinical significance of altered GSH levels in human diseases is not fully understood.
Purpose of the Study:
- To review the consequences of in vivo glutathione variations.
- To evaluate the pathophysiological significance of perturbed GSH status in human disease.
Main Methods:
- Literature review of studies examining in vivo GSH variations.
- Analysis of kinetic properties of GSH-dependent enzymes.
- Evaluation of the role of mitochondrial GSH in cellular toxicity.
Main Results:
- Intracellular GSH concentrations above 2 mM suggest minimal metabolic impact from depletion alone.
- Cellular integrity can be maintained even with up to 90% GSH loss if no additional stress is present.
- Mitochondrial GSH, comprising ~10% of total GSH, may indicate the toxicity threshold.
Conclusions:
- Severe GSH depletion, particularly impacting mitochondria, can initiate toxicity.
- Therapeutic substitution of GSH appears justified in cases of severe depletion.
- Conditions like liver dysfunction, AIDS, and pulmonary fibrosis are associated with severe GSH depletion.