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Updated: Jun 10, 2026
Murine Short Axis Ventricular Heart Slices for Electrophysiological Studies
Published on: June 4, 2017
Adult rat myocardial slices: A tool for studies of comparative cardiotoxicity
A R Parrish1, R T Dorr, A J Gandolfi
1Department of Pharmacology, University of Arizona, Health Sciences Center, Tucson, Arizona, USA.
Abstract:
The applicability of myocardial slices in comparative cardiotoxicity studies was investigated using the known cardiotoxicants allylamine (AAM) and doxorubicin (DOX). Precision-cut adult rat myocardial slices are a recently developed in vitro system. Previously, it has been demonstrated that myocardial slices are viable for up to 24 hr in organ culture. Myocardial slices exhibited a concentration- and time-dependent loss of viability in response to exposure to AAM or DOX (10(-7), 10(-6) or 10(-5)m) during 24 hr in culture, as assessed by biochemical parameters including protein synthesis, ATP content, lipid peroxidation and the loss of the cytosolic enzyme creatine kinase. Protein synthesis and ATP content were sensitive indicators of slice viability, while lipid peroxidation was affected only by 10(-5)m DOX. Myocardial slices appear to be a useful in vitro system for the study of the cardiotoxic potential of chemicals. The maintenance of normal cellular architecture makes myocardial slices uniquely attractive for these studies.
Insights
This study shows that precision-cut myocardial slices are a valuable in vitro model for assessing chemical cardiotoxicity. These heart tissue slices effectively detect damage from known toxins like allylamine and doxorubicin.
Area of Science:
- Cardiovascular Research
- Toxicology
- In Vitro Models
Background:
- Precision-cut myocardial slices represent a novel in vitro system for cardiac research.
- Previous studies confirmed the viability of these slices for up to 24 hours in organ culture.
Purpose of the Study:
- To investigate the utility of myocardial slices in comparative cardiotoxicity studies.
- To evaluate the response of myocardial slices to known cardiotoxic agents.
Main Methods:
- Adult rat myocardial slices were exposed to allylamine (AAM) and doxorubicin (DOX) at varying concentrations (10^-7 to 10^-5 M) for 24 hours.
- Slice viability was assessed using biochemical markers: protein synthesis, ATP content, lipid peroxidation, and creatine kinase release.
Main Results:
- Myocardial slices demonstrated a concentration- and time-dependent decrease in viability when exposed to AAM and DOX.
- Protein synthesis and ATP content were sensitive indicators of cardiotoxicity.
- Lipid peroxidation was only affected by the highest concentration of DOX (10^-5 M).
Conclusions:
- Precision-cut myocardial slices are a useful in vitro system for evaluating the cardiotoxic potential of chemicals.
- The preservation of normal cellular architecture in myocardial slices makes them particularly suitable for cardiotoxicity studies.
