Volume 8, Issue 2 pp. 928-937
Original Research Article
Open Access

Doxorubicin-induced and trastuzumab-induced cardiotoxicity in mice is not prevented by metoprolol

Martin Nicol

Martin Nicol

Cardiology Department, Lariboisiere Hospital, University of Paris, Paris, France

Inserm UMR-S 942, University of Paris, Lariboisiere Hospital, Paris, France

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Malha Sadoune

Malha Sadoune

Inserm UMR-S 942, University of Paris, Lariboisiere Hospital, Paris, France

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Evelyne Polidano

Evelyne Polidano

Inserm UMR-S 942, University of Paris, Lariboisiere Hospital, Paris, France

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Jean Marie Launay

Jean Marie Launay

Inserm UMR-S 942, University of Paris, Lariboisiere Hospital, Paris, France

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Jane Lise Samuel

Jane Lise Samuel

Inserm UMR-S 942, University of Paris, Lariboisiere Hospital, Paris, France

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Feriel Azibani

Feriel Azibani

Inserm UMR-S 942, University of Paris, Lariboisiere Hospital, Paris, France

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Alain Cohen-Solal

Corresponding Author

Alain Cohen-Solal

Cardiology Department, Lariboisiere Hospital, University of Paris, Paris, France

Inserm UMR-S 942, University of Paris, Lariboisiere Hospital, Paris, France

Correspondence to: Alain Cohen-Solal, Department of Cardiology, Lariboisiere Hospital, University of Paris, 2 rue Ambroise Paré, 75010 Paris, France.

Email: [email protected]

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First published: 02 February 2021
Citations: 16

Feriel Azibani and Alain Cohen-Solal contributed equally to this work.

Abstract

Aims

Our objectives were to validate a murine model of chronic cardiotoxicity induced by Doxorubicin (Dox) and Trastuzumab (Trast) and to test the potential cardio-protective effect of metoprolol.

Methods and results

Male C57Bl6 mice were intraperitoneally injected during 2 weeks with Dox (24 mg/kg) or saline, and then with Trast (10 mg/kg) or saline for two more weeks. Half of the mice received metoprolol (100 mg/kg). Cardiotoxicity was defined by a decline in left ventricular ejection fraction (LVEF) ≥ 10 points. At Day 42, Dox + Trast-treated mice exhibited a 13-points decline in LVEF (74 ± 2.6% vs. 87 ± 0.8% for control mice, P < 0.001) and a severe cardiac atrophy (heart weight: 105 ± 2.7 mg vs. 119 ± 3.9 mg for control mice, P < 0.01). This cardiac atrophy resulted from an excess of cardiac necrosis (assessed by plasma cardiac troponin I level: 3.2 ± 0.4 ng/L vs. 1.3 ± 0.06 ng/L for control mice, P < 0.01), an increase in apoptosis (caspase 3 activity showing a six-fold increase for Dox + Trast-treated mice vs. controls, P < 0.001), and cardiomyocyte atrophy (myocyte size: 0.67 ± 0.08 μm2 vs. 1.36 ± 0.10 μm2 for control mice, P < 0.001). In addition, Dox + Trast-treated mice were shown to have an increased cardiac oxidative stress (164 ± 14 dihydroethidine-marked nuclei per area vs. 56 ± 9.5 for control mice, P < 0.01) and increased cardiac fibrosis (the semi-quantitative fibrosis score was three-fold higher for Dox + Trast-treated mice as compared with controls, P < 0.01). Metoprolol was not able to prevent either the decrease in LVEF or the severe cardiac atrophy, the cardiac necrosis, and the cardiac remodelling induced by chemotherapies.

Conclusion

A murine model of chronic cardiotoxicity induced by Dox and Trast was characterized by a decrease in cardiac function, a cardiac apoptosis and necrosis leading to cardiomyocyte atrophy. Metoprolol did not prevent this cardiotoxicity.

Conflict of interest

None declared.

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