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Changes in erythrocyte membranes in burned rabbits
1Trauma Center, Postgraduate Medical College, PLA Beijing, People's Republic of China.
Burns, Including Thermal Injury
|August 1, 1988
Summary
Severe burn injury and subsequent wound infection in rabbits significantly impair erythrocyte membrane function and antioxidation abilities. These changes impact biological membrane structure and function, particularly during sepsis.
Area of Science:
- Biochemistry
- Physiology
- Burn Medicine
Background:
- Full thickness burns cause significant physiological stress.
- Burn wound infections can exacerbate systemic complications.
- Erythrocyte membrane integrity is crucial for oxygen transport and cellular function.
Purpose of the Study:
- To investigate the effects of burn injury and subsequent wound infection on erythrocyte membrane properties in rabbits.
- To assess changes in ATPase activities, antioxidation capacity, and protein profiles of erythrocyte membranes post-burn.
- To correlate these changes with electrolyte content in erythrocytes and serum.
Main Methods:
- Induction of full thickness burns (30% TBSA) in white rabbits.
- Monitoring for wound infection development and severity.
- Biochemical assays for Ca++-ATPase, Na+,K+-ATPase, and Mg++-ATPase activities.
- Determination of erythrocyte and serum sodium (Na+) content.
- Assessment of erythrocyte antioxidation ability via hemolysis in hydrogen peroxide (H2O2).
- Analysis of erythrocyte membrane protein profiles using SDS-polyacrylamide gel electrophoresis.
Main Results:
- Burn injury initially elevated Ca++-ATPase activity, which declined with severe infection. Na+,K+-ATPase and Mg++-ATPase activities fluctuated above preburn levels.
- Erythrocyte Na+ content increased initially, then decreased, while serum Na+ showed the opposite trend.
- Antioxidation ability, measured by erythrocyte hemolysis, was significantly impaired post-burn and worsened during infection.
- SDS-PAGE revealed alterations in erythrocyte membrane protein composition during infection, including changes in specific band sizes and ratios.
Conclusions:
- Burn injury, particularly when complicated by sepsis, profoundly affects erythrocyte membrane structure and function.
- Impaired antioxidation capacity and altered ion transport are key consequences of burn-induced sepsis.
- These findings highlight the systemic impact of severe burns on cellular membrane integrity and homeostasis.