title: Prevention of doxorubicin-induced acute cardiotoxicity by an experimental antioxidant compound.
abstract: Doxorubicin is a widely used anticancer agent, but its application is restricted by its cardiotoxic side effects. The current theory of its cardiotoxicity is based on free radical formation. The compound H-2545, having a 3-carboxamido-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrole moiety, was reported to exhibit antioxidant properties and accumulate in cell membranes, scavenging free radicals at the site of formation. Therefore, we hypothesized that H-2545 could reduce the doxorubicin-induced acute deterioration of cardiac function. Langendorff-perfused rat hearts were treated with doxorubicin and/or H-2545, its metabolite H-2954, or dihydrolipoamide. High-energy phosphate levels, contractile function, lipid peroxidation, protein oxidation, and Akt phosphorylation were investigated. We also determined whether the antioxidants influenced doxorubicin toxicity on malignant cells. During perfusion with doxorubicin, the energetic and functional parameters of the myocardium were improved by adding H-2545. H-2545 significantly diminished doxorubicin-induced lipid and protein damage. On H-2545 treatment, the doxorubicin-triggered Akt phosphorylation was markedly reduced, whereas dihydrolipoamide had such an effect only at higher concentrations. H-2545 did not alter the anticancer effect of doxorubicin on malignant cell lines. We propose that the coadministration of the antioxidant H-2545 attenuates doxorubicin-induced acute cardiotoxicity without interfering with its anticancer effects. Prevention of the acute adverse effects of doxorubicin on myocardium may hinder the later development of cardiomyopathy.
authors.affiliation: First Department of Medicine, Division of Cardiology,University of Pecs Medical School, Pecs, Hungary.
authors.forename: Peter
authors.initials: P
authors.lastname: Deres
authors.forename: Robert
authors.initials: R
authors.lastname: Halmosi
authors.forename: Ambrus
authors.initials: A
authors.lastname: Toth
authors.forename: Krisztina
authors.initials: K
authors.lastname: Kovacs
authors.forename: Anita
authors.initials: A
authors.lastname: Palfi
authors.forename: Tamas
authors.initials: T
authors.lastname: Habon
authors.forename: Laszlo
authors.initials: L
authors.lastname: Czopf
authors.forename: Tamas
authors.initials: T
authors.lastname: Kalai
authors.forename: Kalman
authors.initials: K
authors.lastname: Hideg
authors.forename: Balazs
authors.initials: B
authors.lastname: Sumegi
authors.forename: Kalman
authors.initials: K
authors.lastname: Toth
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000009:adverse effects* / Q000494:pharmacology; D000975:Antioxidants / Q000378:metabolism / Q000494:pharmacology*; D045744:Cell Line, Tumor; D004317:Doxorubicin / Q000009:adverse effects* / Q000494:pharmacology; D004734:Energy Metabolism; D016166:Free Radical Scavengers / Q000378:metabolism / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D007211:Indoles / Q000378:metabolism / Q000494:pharmacology*; D015227:Lipid Peroxidation / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects*; D009206:Myocardium / Q000378:metabolism*; D010084:Oxidation-Reduction; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000187:drug effects / Q000378:metabolism; D011518:Proto-Oncogene Proteins / Q000187:drug effects / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt; D051381:Rats; D008063:Thioctic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D000903:Antibiotics, Antineoplastic; D000975:Antioxidants; D016166:Free Radical Scavengers; C441088:H 2545; D007211:Indoles; D011518:Proto-Oncogene Proteins; C007409:dihydrolipoamide; D008063:Thioctic Acid; D004317:Doxorubicin; C494918:AKT1 protein, human; C494920:Akt1 protein, rat; D017346:Protein Serine-Threonine Kinases; D051057:Proto-Oncogene Proteins c-akt