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Peroxides inhibit the glutathione S-conjugate pump
M Soszyński1, Z Skalski, L Pułaski
1Department of Molecular Biophysics, University of Lódź, Poland.
Biochemistry and Molecular Biology International
|October 1, 1995
Summary
Oxidative stress from peroxides can harm cellular detoxification by inhibiting the transport of glutathione S-conjugates in human red blood cells. This damage to the erythrocyte membrane pump may reduce resistance to chemical stressors.
Area of Science:
- Biochemistry
- Cell Biology
- Toxicology
Background:
- Cellular detoxification relies on the transport of glutathione S-conjugates.
- Oxidative stress is a known cellular damaging factor.
- Erythrocytes play a role in cellular defense and transport.
Purpose of the Study:
- To investigate the impact of peroxides on the efflux of dinitrophenyl-S-glutathione (DNP-SG) from human erythrocytes.
- To determine if oxidative stress affects cellular resistance to chemical stress.
Main Methods:
- Treatment of human erythrocytes with tert-Butyl hydroperoxide and valine hydroperoxide.
- Measurement of dinitrophenyl-S-glutathione (DNP-SG) efflux.
- Analysis of free radical generation in erythrocytes.
Main Results:
- Tert-Butyl hydroperoxide (100-300 microM) significantly inhibited DNP-SG efflux.
- Valine hydroperoxide (150 microM) also demonstrated inhibitory effects on DNP-SG transport.
- Peroxides generated free radicals in erythrocytes, potentially damaging the DNP-SG pump.
Conclusions:
- Oxidative stress induced by peroxides can impair the function of the glutathione S-conjugate pump in erythrocytes.
- This impairment suggests that oxidative stress may compromise cellular defense mechanisms against other chemical stressors.
- Free radical generation by peroxides is implicated in the damage to the erythrocyte membrane's transport system.