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|Title:||Pharmaco/ferrokinetic-related pro-oxidant activity of deferiprone in β-thalassemia|
Noppawan Phumala Morales
Lie M G Limenta
National University of Singapore
The Institute of Science and Technology for Research and Development, Mahidol University
|Keywords:||Biochemistry, Genetics and Molecular Biology|
|Citation:||Free Radical Research. Vol.43, No.5 (2009), 485-491|
|Abstract:||The potential of free radical formation in serum of β-thalassemia/ Hb E patients receiving a single oral dose of 25 mg/kg body weight of deferiprone, a bidentate orally active iron chelator, was evaluated using EPR/spin trapping technique. In the presence of ascorbic acid and tert-butylhydroperoxide, EPR signals of ascorbyl radical (aH= 0.18 mT) and DMPO-carbon centred adduct (aH= 2.37 mT, aN= 1.65 mT) were detected. Shortly after deferiprone administration, EPR signal intensities decreased concomitant with an increase in serum levels of deferiprone. Unfortunately, enhanced EPR signal intensities were observed at 300 min after dosing in patients with serum molar ratio of deferiprone to iron less than 3, suggesting the formation of incomplete iron-deferiprone complexes and consequently free radical formation. To avoid adverse effects of deferiprone, a dosage regimen should be designed according to iron status of the patients and aimed at maintaining an adequate ratio of serum chelator-to-iron concentration.|
|Appears in Collections:||Scopus 2006-2010|
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