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Transferrin modifications and lipid peroxidation: implications in diabetes mellitus
Ann van Campenhout1, Christel M van Campenhout, Albert R Lagrou
1Laboratory of Endocrinology, University of Antwerp, Wilrijk 2610, Belgium.
Free Radical Research
|January 6, 2004
Summary
Lower transferrin levels and glycation in diabetes impair iron binding, increasing oxidative damage. This suggests transferrin dysfunction contributes to diabetes-related lipid peroxidation and complications.
Area of Science:
- Biochemistry
- Endocrinology
- Oxidative Stress Research
Background:
- Free iron promotes free radical production and oxidative damage, like lipid peroxidation.
- Transferrin sequesters iron, acting as a key antioxidant defense.
- Diabetes mellitus is linked to increased oxidative stress and lipid peroxidation, but transferrin's role is unclear.
Purpose of the Study:
- To investigate the impact of transferrin concentration and glycation on its antioxidant function.
- To determine if transferrin abnormalities contribute to oxidative stress in diabetes.
Main Methods:
- Assessed apotransferrin's antioxidant capacity to inhibit iron-induced lipid peroxidation at varying concentrations.
- Quantified transferrin glycation by pre-incubating with glucose.
- Measured iron-binding capacity using colorimetric methods.
Main Results:
- Atransferrin's iron-binding antioxidant capacity decreased with lower concentrations and increased glycation.
- Glycation reduced total iron-binding capacity in a glucose-concentration-dependent manner.
- Iron-independent antioxidant capacity (chemiluminescence-quenching) was unaffected by glycation.
Conclusions:
- Reduced transferrin concentration and glycation diminish its iron-binding antioxidant capacity.
- These transferrin alterations may enhance iron's pro-oxidant effects, contributing to diabetes-associated lipid peroxidation.
- Transferrin dysfunction is a potential factor in diabetic complications.