We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Antimuscarinic action of doxorubicin does not involve free-radical formation in isolated guinea pig hearts.
- Authors
Sasaki, Takushi; Ueno, Shunji; Hara, Yukio; Uchide, Tsuyoshi; Temma, Kyosuke
- Abstract
It has been proposed that the cardiotoxicity of anthracycline anticancer drugs involves free-radical formation. One early manifestation of toxicity appears to be caused by the antimuscarinic actions of these drugs. Accordingly, we examined whether the antimuscarinic action of one of these drugs, doxorubicin, is altered by antioxidants. In electrically stimulated left atrial muscle preparations obtained from guinea pig hearts, doxorubicin significantly increased the tissue concentration of thiobarbituric acid-reactive substance indicating increased lipid peroxidation. This effect of doxorubicin was significantly suppressed by the antioxidants α-tocopherol, dexrazoxane, and epigallocatechin gallate. Carbachol produced a concentration-dependent negative inotropic effect in our atrial preparations. Doxorubicin caused a seemingly parallel rightward shift of the concentration-response curve for carbachol. Neither α-tocopherol, dexrazoxane, nor epigallocatechin gallate reversed this effect of doxorubicin. The results indicate that in extirpated heart tissue, doxorubicin causes lipid peroxidation through the formation of free radicals. However, this effect of doxorubicin is unrelated to its antimuscarinic action.
- Subjects
GUINEA pigs as laboratory animals; DOXORUBICIN; ANTINEOPLASTIC antibiotics; ANTIOXIDANTS; FREE radical reactions
- Publication
Canadian Journal of Physiology & Pharmacology, 2010, Vol 88, Issue 1, p77
- ISSN
0008-4212
- Publication type
Article
- DOI
10.1139/Y09-093