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The effect of copper ion on glutathione and hemolysis in rabbit erythrocytes
J M Caffrey1, A Dasmahapatra, H A Smith
1Dept. of Chemistry, Florida State University, 32306-3006, Tallahassee, FL.
Insights
Copper ions cause hemolysis and glutathione decline in red blood cells. These are independent, concurrent processes, with oxygen essential for hemolysis and most glutathione loss.
Area of Science:
- Biochemistry
- Hematology
- Toxicology
Background:
- Copper ions are known to induce oxidative stress in biological systems.
- Previous studies suggested glutathione (GSH) depletion is a prerequisite for copper-induced hemolysis.
- The precise relationship between copper, oxidative stress, GSH, and hemolysis requires further clarification.
Purpose of the Study:
- To investigate the relationship between copper ion concentration and the rates of hemolysis and glutathione decline in rabbit erythrocytes.
- To determine if glutathione decline is a necessary precursor to hemolysis or if these processes occur independently.
- To elucidate the role of oxygen in copper-induced hemolysis and glutathione depletion.
Main Methods:
- Rabbit erythrocytes were exposed to varying concentrations of copper ions.
- Rates of hemolysis were measured spectrophotometrically.
- Glutathione levels were quantified using a validated biochemical assay.
- Experiments were conducted under both aerobic and deaerated conditions.
Main Results:
- Both hemolysis and glutathione decline were dependent on copper ion concentration.
- Hemolysis and glutathione decline were found to be concurrent and independent processes.
- Oxygen was confirmed as a necessary reactant for hemolysis and a major contributor to glutathione decline.
- A slow decline in glutathione was observed even in deaerated systems in the presence of copper ions.
Conclusions:
- Copper-induced hemolysis and glutathione decline in erythrocytes are independent but concurrent events.
- Oxygen plays a critical role in both copper-induced hemolysis and glutathione depletion.
- While oxygen is a major factor, copper ions can induce a slow, oxygen-independent decline in glutathione.
Abstract:
The rate of hemolysis and the decline in glutathione (GSH) in rabbit erythrocytes caused by copper (Cu) ions were determined. Prior investigations have proposed that the oxidative stress induced by Cu ion depleted the normal cell protective mechanisms. The decline in GSH has been proposed as a necessary prerequisite for hemolysis. We have observed that both GSH decline and hemolysis are Cu dependent, but are two concurrent and independent processes. We have confirmed that oxygen is a necessary reactant for hemolysis and responsible for a major portion of GSH decline. However, in the presence of Cu ion, a slow decline in GSH occurs even in a deaerated system.
