Activation of AMP-activated protein kinase by human EGF receptor 2/EGF receptor tyrosine kinase inhibitor protects cardiac cells.
The human EGF receptor (HER) 2 receptor tyrosine kinase is a survival factor for human cardiomyocytes, and its inhibition may explain the increased incidence of cardiomyopathy associated with the anti-HER2 monoclonal antibody trastuzumab (Genentech, South San Francisco, CA), particularly in patients with prior exposure to cardiotoxic chemotherapies e.g., anthracyclines. Here, we show that GW2974 (HER2/EGF receptor tyrosine kinase inhibitor), but not trastuzumab, activates AMP-activated protein kinase (AMPK), initiating a metabolic stress response in human cardiomyocytes that protects against TNFalpha-induced cell death. GW2974 stimulates calcium dependent fatty acid oxidation in vitro and in the myocardium of GW2974-treated rodents. Calcium chelation or siRNA-targeted AMPK knockdown blocks GW2974 induced fatty acid oxidation. In addition, inhibition of AMPK by a specific inhibitor resulted in increased killing of cardiomyocytes. Elucidating the effects of HER2-targeted therapies on AMPK may predict for risk of cardiomyopathy and provide a novel HER2-targeted strategy designed to protect myocardium from the pro-apoptotic effects of pro-inflammatory cytokines released in response to cardiac injury by chemotherapy or acute ischemia.
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- Receptor, erbB-2
- Receptor, ErbB-2
- Rats, Sprague-Dawley
- Rats
- Quinazolines
- Protein-Tyrosine Kinases
- Protein Serine-Threonine Kinases
- Phosphorylation
- Oxidation-Reduction
- Myocytes, Cardiac
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Receptor, erbB-2
- Receptor, ErbB-2
- Rats, Sprague-Dawley
- Rats
- Quinazolines
- Protein-Tyrosine Kinases
- Protein Serine-Threonine Kinases
- Phosphorylation
- Oxidation-Reduction
- Myocytes, Cardiac