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Time-dependent responses of rat troponin I and cardiac injury following isoproterenol administration

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Author(s): Sabaheta Hasić | Radivoj Jadrić | Emina Kiseljaković | Amina Valjevac | Zakira Mornjaković | Mira Winterhalter-Jadrić

Journal: Medicinski Glasnik
ISSN 1840-0132

Volume: 8;
Issue: 1;
Start page: 140;
Date: 2011;
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Keywords: cardiac troponin I | isoproterenol | heart | rat

ABSTRACT
Aim To develop a rat model of myocardial infarction induced by isoproterenol (ISO). We investigated a type of histological myocardial changes and cardiac troponin I (TnI) kinetic. Methods The study has used adult, male, Wistar strain rats. Rats were distributed in ISO and control groups. Rats treated with ISO were divided into groups according to the time of cTnI and myocardial lesion analyses: ISO I (30’), ISO II (60’), ISO III (120’) and ISO IV (240’). We determined cTnI (Life Diagnostics Inc. West Chester PA, USA) in the serum by ELISA method. We performed histological analysis on the specimens of left ventricular wall stained by hematoxillin-eosin (HE) method. Results The irst statistically signiicant rise of cTnI was noted 30 minutes after the ISO administration. There was no statistically signiicant difference between cTnI mean values among the ISO groups. Observed myocardial histological changes were time dependent. Conclusions This model can be suitable for cardioprotective and cardiotoxicity supstance investigations followed by cTnI measurement in blood. The similarity between induced myocardial lesion on animal model in our study and human myocardial lesion in ischemia give us suficient impulse for further preclinical researches of new cardiac markers.
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