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Cardiac troponin T as a marker of myocardial damage caused by antineoplastic drugs in rabbits

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Anthracycline derivatives are among the most effective antineoplastic drugs but their therapeutic use is limited by their adverse effects. The cardiac side-effects of antineoplastic drugs were investigated in rabbits in vivo from the viewpoint of release of cardiac troponin T (cTnT) measured by Elecsys Troponin T STAT immunoassay (Boehringer Mannheim, Germany). No increase in cTnT was found following administration of a single dose of daunorubicin (3 mg/kg i.v., n = 4). During development of daunorubicin-induced cardiomyopathy (daunorubicin 3 mg/kg i.v., once a week; maximum nine administrations, n = 7), the levels of cTnT were within the physiological range (i.e. cTnT < 0.1 μg/1) at the beginning of the experiment and before and after the 5th administration, but the pathological values of cTnT after the 8th administration in 43% animals (0.22 ± 0.08 μg/l) correlated with their premature death. In the control group, the levels of cTnT were always lower than 0.1 μg/l during the experiment. Following administration of a new antineoplastic drug – Oracin {6-[2-(2-hydroxyethyl) aminoethyl]-5,11-dioxo-5,6-dihydro-11H-indeno [1,2-c]-isoquinoline hydrochloride, 10 mg/kg i.v., once weekly, ten administrations, n = 7}, there was no increase in cTnT levels. These findings correlated with the PEP: LVET index, histological examination and no animal succumbing to premature death. It is possible to conclude that cTnT is a useful marker for the prediction of experimentally induced anthracycline cardiomyopathy and for the evaluation of cardiotoxic (and, possibly, cardioprotective) effects of new drugs in rabbits.

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Received: 1 October 1998 / Accepted: 23 November 1998

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Adamcová, M., Geršl, V., Hrdina, R. et al. Cardiac troponin T as a marker of myocardial damage caused by antineoplastic drugs in rabbits. J Cancer Res Clin Oncol 125, 268–274 (1999).

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  • Key words Cardiac troponin T
  • Daunorubicin
  • Oracin
  • Cardiomyopathy
  • Rabbits