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Title: Receptor tyrosine kinase EphA5 is a functional molecular target in human lung cancer

Lung cancer is often refractory to radiotherapy, but molecular mechanisms of tumor resistance remain poorly defined. Here we show that the receptor tyrosine kinase EphA5 is specifically overexpressed in lung cancer and is involved in regulating cellular responses to genotoxic insult. In the absence of EphA5, lung cancer cells displayed a defective G1/S cell cycle checkpoint, were unable to resolve DNA damage, and became radiosensitive. Upon irradiation, EphA5 was transported into the nucleus where it interacted with activated ATM (ataxia-telangiectasia mutated) at sites of DNA repair. In conclusion, we demonstrate that a new monoclonal antibody against human EphA5 sensitized lung cancer cells and human lung cancer xenografts to radiotherapy and significantly prolonged survival, thus suggesting the likelihood of translational applications.
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  1. Univ. of Mexico School of Medicine, Albuquerque, NM (United States)
  2. Univ. of Texas M. D. Anderson Cancer Center, Houston, TX (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Arrowhead Research Corp., Pasadena, CA (United States)
  5. Harvard Medical School, Boston, MA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0021-9258
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Biological Chemistry
Additional Journal Information:
Journal Volume: 290; Journal Issue: 12; Journal ID: ISSN 0021-9258
American Society for Biochemistry and Molecular Biology
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Country of Publication:
United States
59 BASIC BIOLOGICAL SCIENCES cell cycle; DNA damage; DNA damage response; DNA repair; monoclonal antibody; receptor tyrosine kinase; ionizing radiation