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4-Hydroxyalk-2-enals are substrates for glutathione transferase.
FEBS Letters
|January 7, 1985
Summary
Glutathione transferases, particularly isoenzyme 4-4, efficiently detoxify harmful lipid peroxidation products like 4-hydroxyalkenals. This highlights their crucial role in protecting cells from oxidative damage.
Area of Science:
- Biochemistry
- Cell Biology
- Toxicology
Background:
- 4-hydroxyalk-2-enals are cytotoxic products of lipid peroxidation.
- These compounds can conjugate with intracellular glutathione.
- Glutathione transferases (GSTs) are enzymes involved in detoxification.
Purpose of the Study:
- To investigate the activity of rat liver cytosolic glutathione transferases towards 4-hydroxyalkenals.
- To identify specific GST isoenzymes involved in the conjugation of these lipid peroxidation products.
Main Methods:
- Assay of specific activities of rat liver cytosolic GSTs with 4-hydroxynonenal and 4-hydroxydecenal.
- Identification of the most active GST isoenzyme.
Main Results:
- Rat liver cytosolic GSTs exhibited high specific activities towards 4-hydroxynonenal and 4-hydroxydecenal.
- GST isoenzyme 4-4 showed the highest specific activity among those tested.
- Spontaneous conjugation rates were negligible compared to GST-mediated rates.
Conclusions:
- Glutathione transferase 4-4 plays a significant role in detoxifying 4-hydroxyalkenals.
- GSTs are crucial for cellular protection against oxidative stress by detoxifying reactive aldehydes.
- This enzyme family protects cells from various oxidative metabolites, including epoxides and hydroperoxides.