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Dapsone-induced hemolytic anemia
D J Jollow1, T P Bradshaw, D C McMillan
1Departments of Cell and Molecular Pharmacology, Medical University of South Carolina, Charleston 29425, USA.
Drug Metabolism Reviews
|January 1, 1995
Summary
Dapsone
Area of Science:
- Pharmacology
- Hematology
- Toxicology
Background:
- Dapsone is an established leprosy treatment with expanding therapeutic uses.
- Dapsone's clinical utility is limited by severe, dose-dependent hemotoxicity.
- Understanding dapsone's mechanism of red blood cell damage is crucial for developing countermeasures.
Purpose of the Study:
- To elucidate the mechanisms of dapsone-induced red blood cell damage.
- To identify the specific dapsone metabolites responsible for hemotoxicity.
- To investigate the red blood cell structural and functional changes induced by dapsone.
Main Methods:
- Incubation of rat and human red blood cells with dapsone and its metabolites.
- Analysis of radical generation, protein-adduct formation, and red blood cell morphology.
- Assessment of splenic sequestration in vivo.
Main Results:
- N-hydroxy metabolites (DDS-NOH, MADDS-NOH) directly cause hemolysis in rat red cells.
- These metabolites generate hydroxyl, glutathiyl, and hemoglobinthiyl radicals.
- Red blood cells exhibit significant morphological changes and increased splenic sequestration.
Conclusions:
- Dapsone's N-hydroxy metabolites are the primary agents of hemotoxicity.
- Metabolite-induced oxidative stress and protein cross-linking damage red blood cells.
- Findings provide a basis for developing strategies to mitigate dapsone's adverse hematological effects.