Cited by 445HER2/EGFR in Cancer ResearchLung Cancer Treatments and MutationsProtein Kinase Regulation and GTPase Signaling

Kinetic Analysis of Epidermal Growth Factor Receptor Somatic Mutant Proteins Shows Increased Sensitivity to the Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitor, Erlotinib

Carey, Kendall D., Garton, Andrew J., Romero, Maria S., Kahler, Jennifer, Thomson, Stuart, Ross, Sarajane, Park, Frances, Haley, John D. +2 more·2006·Cancer Research

Abstract

We show that two commonly occurring epidermal growth factor receptor (EGFR) somatic mutations, L858R and an in-frame deletion mutant, Del(746-750), exhibit distinct enzymatic properties relative to wild-type EGFR and are differentially sensitive to erlotinib. Kinetic analysis of the purified intracellular domains of EGFR L858R and EGFR Del(746-750) reveals that both mutants are active but exhibit a higher KM for ATP and a lower Ki for erlotinib relative to wild-type receptor. When expressed in NR6 cells, a cell line that does not express EGFR or other ErbB receptors, both mutations are ligand dependent for receptor activation, can activate downstream EGFR signaling pathways, and promote cell cycle progression. As expected from the kinetic analysis, the EGFR Del(746-752) is more sensitive to erlotinib inhibition than the EGFR L858R mutant. Further characterization shows that these mutations promote ligand-dependent and anchorage-independent growth, and cells harboring these mutant receptors form tumors in immunocompromised mice. Analysis of tumor lysates reveals that the tumorigenicity of the mutant EGFR cell lines may be due to a differential pattern of mutant EGFR autophosphorylation as compared with wild-type receptor. Significant inhibition of tumor growth, in mice harboring wild-type EGFR receptors, is only observed at doses of erlotinib approaching the maximum tolerated dose for the mouse. In contrast, the growth of mutant tumors is inhibited by erlotinib treatment at approximately one third the maximum tolerated dose. These findings suggest that EGFR somatic mutations directly influence both erlotinib sensitivity and cellular transformation. (Cancer Res 2006; 66(16): 8163-71)

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Crossref · 10.1158/0008-5472.can-06-0453

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Authors
Carey, K. D., Garton, A. J., Romero, M. S., Kahler, J., Thomson, S., Ross, S., Park, F., Haley, J. D., Gibson, N., & Sliwkowski, M. X.
Affiliations
  • Genentech (US)
  • 2Translational Research, OSI Pharmaceuticals, Farmingdale, New York; and
  • 3SGX Pharmaceuticals, Inc., San Diego, California
Venue
Cancer Research
Published
2006-08-15
Volume
66
Issue
16
Pages
8163-8171
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W2145497412
Cited by
445
References
50
Citations by year
2026: 6 · 2025: 14 · 2024: 14 · 2023: 24 · 2022: 24 · 2021: 25 · 2020: 24 · 2019: 18 · 2018: 26 · 2017: 27 · 2016: 27 · 2015: 28 · 2014: 26 · 2013: 31 · 2012: 25
FWCI
9.74
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Oncology › HER2/EGFR in Cancer Research
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Treatments and Mutations
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
epidermal growth factor receptor, L858R mutation, in-frame deletion mutants, erlotinib, tyrosine kinase inhibitor sensitivity, receptor tyrosine kinase, ATP affinity, ligand-dependent receptor activation, autophosphorylation, anchorage-independent growth, tumor growth inhibition, cell transformation, EGFR signaling
MeSH terms
Erlotinib Hydrochloride, Cell Division, Cell Transformation, Neoplastic, Cloning, Molecular, Genetic Vectors, Humans, Kinetics, Mutation, Quinazolines, Mutagenesis, Sequence Deletion, Cell Line, Tumor, Protein Kinase Inhibitors, ErbB Receptors

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