Douglas Sawyer
Faculty Member
Last active: 7/21/2014

Inhibition of ErbB2 by receptor tyrosine kinase inhibitors causes myofibrillar structural damage without cell death in adult rat cardiomyocytes.

Pentassuglia L, Graf M, Lane H, Kuramochi Y, Cote G, Timolati F, Sawyer DB, Zuppinger C, Suter TM
Exp Cell Res. 2009 315 (7): 1302-12

PMID: 19331811 · PMCID: PMC4991362 · DOI:10.1016/j.yexcr.2009.02.001

Inhibition of ErbB2 (HER2) with monoclonal antibodies, an effective therapy in some forms of breast cancer, is associated with cardiotoxicity, the pathophysiology of which is poorly understood. Recent data suggest, that dual inhibition of ErbB1 (EGFR) and ErbB2 signaling is more efficient in cancer therapy, however, cardiac safety of this therapeutic approach is unknown. We therefore tested an ErbB1-(CGP059326) and an ErbB1/ErbB2-(PKI166) tyrosine kinase inhibitor in an in-vitro system of adult rat ventricular cardiomyocytes and assessed their effects on 1. cell viability, 2. myofibrillar structure, 3. contractile function, and 4. MAPK- and Akt-signaling alone or in combination with Doxorubicin. Neither CGP nor PKI induced cardiomyocyte necrosis or apoptosis. PKI but not CGP caused myofibrillar structural damage that was additive to that induced by Doxorubicin at clinically relevant doses. These changes were associated with an inhibition of excitation-contraction coupling. PKI but not CGP decreased p-Erk1/2, suggesting a role for this MAP-kinase signaling pathway in the maintenance of myofibrils. These data indicate that the ErbB2 signaling pathway is critical for the maintenance of myofibrillar structure and function. Clinical studies using ErbB2-targeted inhibitors for the treatment of cancer should be designed to include careful monitoring for cardiac dysfunction.

MeSH Terms (25)

Animals Antibiotics, Antineoplastic Calcium Cell Death Cells, Cultured Connectin Doxorubicin ErbB Receptors Extracellular Signal-Regulated MAP Kinases Female GATA4 Transcription Factor Male Mice Mitochondria Muscle Proteins Myocardial Contraction Myocytes, Cardiac Myofibrils Protein Kinase Inhibitors Proto-Oncogene Proteins c-akt Rats Rats, Wistar Receptor, ErbB-2 Receptor, ErbB-4 Signal Transduction

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