Secondary alcohol metabolites mediate iron delocalization in cytosolic fractions of myocardial biopsies exposed to anticancer anthracyclines. Novel linkage between anthracycline metabolism and iron-induced cardiotoxicity.
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Why the study?
Does doxorubicin metabolism to doxorubicinol increase iron delocalization in human myocardial cytosols compared to less cardiotoxic anthracyclines?
Population
Human myocardial samples including ex vivo atrial samples from patients undergoing aorto-coronary bypass…
Comparison
Exposure of myocardial cytosolic fractions to… vs Exposure to less cardiotoxic anthracyclines or…
Design
Preclinical
Authors
Discussion
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Implication
Animal data link doxorubicin's metabolite and iron effects to cardiotoxicity gradients; leaves open human translation and targeting.
Structured PICO
Does doxorubicin metabolism to doxorubicinol increase iron delocalization in human myocardial cytosols compared to less cardiotoxic anthracyclines?
P
Population
Human myocardial samples (n=62 total) including ex vivo atrial samples from patients undergoing aorto-coronary bypass grafting (n=40, median age 58-59) or Maze's correction (n=2), and ventricular postmortem samples from individuals with morphologically normal myocardium (n=20, median age 53).
I
Intervention
Exposure of myocardial cytosolic fractions to doxorubicin supplemented with NADPH.
C
Comparator
Exposure to less cardiotoxic anthracyclines (daunorubicin, 4'-epi doxorubicin, 4-demethoxy daunorubicin) or iron-depleted cytosols.
O
Outcome
Formation of secondary alcohol metabolites (doxorubicinol) and mobilization of Fe(II) ions.surrogate
The study identifies the formation of secondary alcohol metabolites and nonferritin sources of Fe(III) as critical determinants of anthracycline-induced iron delocalization and cardiac damage, offering a novel mechanistic explanation for cardiotoxicity.
Cite This Study
Minotti et al. (1995) studied this question.
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