Open AccessFunctional Impairment of Human Resident Cardiac Stem Cells by the Cardiotoxic Antineoplastic Agent Trastuzumab
Author(s) -
Barth Andreas S.,
Zhang Yiqiang,
Li Taosheng,
Smith Rachel R.,
Chimenti Isotta,
Terrovitis Ioannis,
Davis Darryl R.,
Kizana Eddy,
Ho Alice S.,
O'Rourke Brian,
Wolff Antonio C.,
Gerstenblith Gary,
Marbán Eduardo
Publication year - 2012
Publication title -
stem cells translational medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.781
H-Index - 71
eISSN - 2157-6580
pISSN - 2157-6564
DOI - 10.5966/sctm.2011-0016
Subject(s) - cardiotoxicity , stem cell , in vivo , in vitro , apoptosis , trastuzumab , medicine , pharmacology , ejection fraction , cancer research , cancer , chemotherapy , heart failure , microbiology and biotechnology , biology , breast cancer , biochemistry
Trastuzumab (TZM), a monoclonal antibody against the ERBB2 protein, increases survival in ERBB2‐positive breast cancer patients. Its clinical use, however, is limited by cardiotoxicity. We sought to evaluate whether TZM cardiotoxicity involves inhibition of human adult cardiac‐derived stem cells, in addition to previously reported direct adverse effects on cardiomyocytes. To test this idea, we exposed human cardiosphere‐derived cells (hCDCs), a natural mixture of cardiac stem cells and supporting cells that has been shown to exert potent regenerative effects, to TZM and tested the effects in vitro and in vivo. We found that ERBB2 mRNA and protein are expressed in hCDCs at levels comparable to those in human myocardium. Although clinically relevant concentrations of TZM had no effect on proliferation, apoptosis, or size of the c‐kit‐positive hCDC subpopulation, in vitro assays demonstrated diminished potential for cardiogenic differentiation and impaired ability to form microvascular networks in TZM‐treated cells. The functional benefit of hCDCs injected into the border zone of acutely infarcted mouse hearts was abrogated by TZM: infarcted animals treated with TZM + hCDCs had a lower ejection fraction, thinner infarct scar, and reduced capillary density in the infarct border zone compared with animals that received hCDCs alone ( n = 12 per group). Collectively, these results indicate that TZM inhibits the cardiomyogenic and angiogenic capacities of hCDCs in vitro and abrogates the morphological and functional benefits of hCDC transplantation in vivo. Thus, TZM impairs the function of human resident cardiac stem cells, potentially contributing to TZM cardiotoxicity.