Abstract
The anticancer drug dasatinib (Sprycel) is a BCR-ABL1-targeted tyrosine kinase inhibitor used in treating chronic myelogenous leukemia that has been shown in clinical trials to display cardiovascular toxicities. While dasatinib potently inhibits BCR-ABL1, it is not a highly selective kinase inhibitor and may have off-target effects. A neonatal rat cardiac myocyte model was used to investigate potential mechanisms by which dasatinib damaged myocytes. The anthracycline cardioprotective drug dexrazoxane was shown to be ineffective in preventing dasatinib-induced myocyte damage. Dasatinib treatment increased doxorubicin accumulation in myocytes and doxorubicin-induced myocyte damage, likely through its ability to bind to one or more ABC-type efflux transporters. Dasatinib induced myocyte damage either after a brief treatment that mimicked the clinical situation, or more potently after continuous treatment. Dasatinib slightly induced apoptosis in myocytes as evidenced by increases in caspase-3/7 activity. Dasatinib treatment reduced pERK levels in myocytes most likely through inhibition of RAF, which dasatinib strongly inhibits. Thus, inhibition of the RAF/MEK/ERK pro-survival pathway in the heart may be, in part, a mechanism by which dasatinib induces cardiovascular toxicity.
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Abbreviations
- ABC:
-
ATP-binding-cassette
- CML:
-
Chronic myeloid leukemia
- DCF:
-
2′,7′-Dichlorofluorescin
- DF-x :
-
Dulbecco's modified eagle medium/Ham's F-12 Medium 1:1 where x is % (v/v) serum
- ERK:
-
Extracellular signal-regulated kinase
- GAPDH:
-
Glyceraldehyde 3-phosphate dehydrogenase
- K d :
-
Kinase binding dissociation constant
- LDH:
-
Lactate dehydrogenase
- PBS:
-
Dulbecco’s phosphate buffered saline (pH 7.4)
- λEx and λEm :
-
Excitation and emission wavelengths, respectively
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Acknowledgements
This research was supported by grants from the Canadian Institutes of Health Research [Grant MOP13748], the Canada Research Chairs Program, and a Canada Research Chair in Drug Development to Brian Hasinoff.
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Hasinoff, B.B., Patel, D. Mechanisms of the Cardiac Myocyte-Damaging Effects of Dasatinib. Cardiovasc Toxicol 20, 380–389 (2020). https://doi.org/10.1007/s12012-020-09565-7
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DOI: https://doi.org/10.1007/s12012-020-09565-7