Summary
In the present study we examined the effects of pirarubicin [(2″R)-4′-0-tetrahydropyranyladriamycin, THP] on a cardiovascular system. An injection of THP (0.39–3.13 mg/kg, i. v.) reduced the mean blood pressure and caused an increase in the respiratory air rate in anesthetized rats. At 1.5×10−6–1.5×10−5 m, THP markedly relaxed a contraction induced by 10−7 m norepinephrine in rat aorta with endothelium but not in that without endothelium. At a dose of 0.02–0.5 mg, THP produced an increase in the contractile force and the perfusion flow of isolated perfused guinea pig hearts. At a higher concentration (4.5×10−5–1.5×10−4 m), it produced a slight increase in the contractile force of the left atria in guinea pigs. This positive inotropic action of THP was inhibited by diphenhydramine (10−6–5×10−5 m), chlorpheniramine (3×10−7–3×10−5 m), and tripelennamine (3×10−7–3×10−5 m) but not by propranolol (10−6 m), cimetidine (10−5 m), diltiazem (10−6 m), or ryanodine (10−8 m). THP given i. v. at 2.5 mg/kg elevated the plasma histamine level in anesthetized dogs. From these data, we conclude that THP mainly relaxed the rat aorta in the presence of endothelium and that at higher concentrations, it increased the contractile force in the cardiac muscle, probably mediated through the release of histamine.
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Hirano, Si., Agata, N., Hara, Y. et al. Effects of pirarubicin, an antitumor antibiotic, on the cardiovascular system. Cancer Chemother. Pharmacol. 28, 266–272 (1991). https://doi.org/10.1007/BF00685533
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DOI: https://doi.org/10.1007/BF00685533