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• W1982181214 endingPage "12616" @default.
• W1982181214 startingPage "12610" @default.
• W1982181214 abstract "Weak antioxidant capacity, particularly low catalase activity in the heart, may be a factor responsible for the high sensitivity of this organ to doxorubicin-induced oxidative damage. To test this hypothesis, a heart-specific promoter was used to drive the expression of murine catalase cDNA in transgenic mice. Fifteen healthy transgenic mouse lines were produced. Cardiac catalase activity was constitutively overexpressed in both atrium and ventricle, ranging from 2- to 630-fold higher than normal. This enzyme activity was not altered in liver, kidneys, lungs, and skeletal muscles. Other antioxidant components, including glutathione, glutathione peroxidase, glutathione reductase, metallothionein, and superoxide dismutase, were not altered in the catalase-overexpressing heart. Mice (7 weeks old) from several transgenic lines and from nontransgenic controls were treated intraperitoneally with doxorubicin at a single dose of 20 mg/kg and sacrificed on the 4th day after treatment. As compared to normal controls, transgenic lines expressing catalase activity 60- or 100-fold higher than normal exhibited a significant resistance to doxorubicin-induced cardiac lipid peroxidation, elevation of serum creatine phosphokinase, and functional changes in the isolated atrium. Interestingly, 200-fold or greater elevation of catalase activity did not provide protection. The results provide direct evidence for the role of catalase in doxorubicin cardiotoxic responses. Weak antioxidant capacity, particularly low catalase activity in the heart, may be a factor responsible for the high sensitivity of this organ to doxorubicin-induced oxidative damage. To test this hypothesis, a heart-specific promoter was used to drive the expression of murine catalase cDNA in transgenic mice. Fifteen healthy transgenic mouse lines were produced. Cardiac catalase activity was constitutively overexpressed in both atrium and ventricle, ranging from 2- to 630-fold higher than normal. This enzyme activity was not altered in liver, kidneys, lungs, and skeletal muscles. Other antioxidant components, including glutathione, glutathione peroxidase, glutathione reductase, metallothionein, and superoxide dismutase, were not altered in the catalase-overexpressing heart. Mice (7 weeks old) from several transgenic lines and from nontransgenic controls were treated intraperitoneally with doxorubicin at a single dose of 20 mg/kg and sacrificed on the 4th day after treatment. As compared to normal controls, transgenic lines expressing catalase activity 60- or 100-fold higher than normal exhibited a significant resistance to doxorubicin-induced cardiac lipid peroxidation, elevation of serum creatine phosphokinase, and functional changes in the isolated atrium. Interestingly, 200-fold or greater elevation of catalase activity did not provide protection. The results provide direct evidence for the role of catalase in doxorubicin cardiotoxic responses." @default.
• W1982181214 created "2016-06-24" @default.
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• W1982181214 date "1996-05-01" @default.
• W1982181214 modified "2023-09-26" @default.
• W1982181214 title "Suppression of Doxorubicin Cardiotoxicity by Overexpression of Catalase in the Heart of Transgenic Mice" @default.
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• W1982181214 doi "https://doi.org/10.1074/jbc.271.21.12610" @default.
• W1982181214 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/8647872" @default.
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