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Adriamycin-Fe3+-induced mitochondrial protein damage with lipid peroxidation
1Department of Biochemistry, Hokkaido Institute of Pharmaceutical Sciences, Otaru, Japan.
Abstract:
Exposure of mitochondria to adriamycin (ADM)-Fe3+ induced formation of thiobarbituric acid reactive substances and fluorescent substances. Butylated hydroxytoluene (BHT) and the water soluble vitamin E analogue, trolox, not only strongly inhibited fluorescence formation but also mitochondrial lipid peroxidation. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis indicated the formation of high molecular weight proteins when mitochondria were exposed to ADM-Fe3+. A mitochondrial protein with a molecular weight of approximately 30 kDa was very sensitive to ADM-Fe3+. BHT and trolox strongly inhibited mitochondrial protein cross-linking, indicating that the protein modification was due to ADM-Fe(3+)-induced lipid peroxidation. In addition, the susceptibility of ADM-Fe(3+)-exposed mitochondrial protein to proteases was unchanged. Bovine serum albumin (BSA) inhibited ADM-Fe(3+)-induced mitochondrial lipid peroxidation. Fluorescence emmited from BSA was detected during ADM-Fe(3+)-induced mitochondrial lipid peroxidation, and BHT strongly inhibited the oxidative modification of BSA. These results suggest that the oxidative modification of mitochondrial proteins and BSA is due to ADM-Fe(3+)-induced lipid peroxidation.
Insights
Adriamycin (ADM)-Fe3+ exposure causes mitochondrial lipid peroxidation and protein damage. Antioxidants like butylated hydroxytoluene (BHT) and trolox protect against this oxidative damage, suggesting lipid peroxidation mediates protein modification.
Area of Science:
- Biochemistry
- Mitochondrial Biology
- Oxidative Stress
Background:
- Mitochondria are crucial cellular organelles susceptible to oxidative damage.
- Adriamycin (ADM) in combination with iron (Fe3+) can induce mitochondrial dysfunction.
- Lipid peroxidation is a key process in oxidative damage.
Purpose of the Study:
- To investigate the effects of ADM-Fe3+ on mitochondria.
- To determine the role of lipid peroxidation in ADM-Fe3+-induced mitochondrial damage.
- To evaluate the protective effects of antioxidants against ADM-Fe3+ toxicity.
Main Methods:
- Mitochondrial exposure to ADM-Fe3+.
- Measurement of thiobarbituric acid reactive substances and fluorescent substances.
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for protein analysis.
- Assessment of protease susceptibility.
- Experiments with antioxidants (BHT, trolox) and bovine serum albumin (BSA).
Main Results:
- ADM-Fe3+ induced mitochondrial lipid peroxidation and protein cross-linking.
- BHT and trolox inhibited fluorescence formation and lipid peroxidation.
- A ~30 kDa mitochondrial protein was sensitive to ADM-Fe3+.
- Protein modification was linked to lipid peroxidation, not protease susceptibility changes.
- BSA also showed oxidative modification during ADM-Fe3+-induced lipid peroxidation.
Conclusions:
- ADM-Fe3+-induced mitochondrial damage is mediated by lipid peroxidation.
- Antioxidants BHT and trolox offer protection against this oxidative damage.
- Mitochondrial protein and BSA oxidative modifications are consequences of ADM-Fe3+-induced lipid peroxidation.
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