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Combination antibody treatment down-regulates epidermal growth factor receptor by inhibiting endosomal recycling

Jamie B. Spangler, Jason R. Neil, Sivan Abramovitch, Yosef Yarden, Forest M. White, Douglas A. Lauffenburger, K. Dane Wittrup and John Kuriyan
Proceedings of the National Academy of Sciences of the United States of America
Vol. 107, No. 30 (July 27, 2010), pp. 13252-13257
Stable URL: http://www.jstor.org/stable/25708703
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Combination antibody treatment down-regulates epidermal growth factor receptor by inhibiting endosomal recycling
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Abstract

Due to its common dysregulation in epithelial-based cancers and extensive characterization of its role in tumor growth, epidermal growth factor receptor (EGFR) is a highly validated target for anticancer therapies. There has been particular interest in the development of monoclonal antibodies (mAbs) targeting EGFR, resulting in two approved mAb-based drugs and several others in clinical trials. It has recently been reported that treatment with combinations of noncompetitive mAbs can induce receptor clustering, leading to synergistic receptor down-regulation. We elucidate three key aspects of this phenomenon. First, we show that highly potent combinations consisting of two noncompetitive mAbs that target EGFR domain 3 reduce surface receptor levels by up to 80% with a halftime of 0.5–5 h in both normal and transformed human cell lines to an extent inversely proportional to receptor density. Second, we find the mechanism underlying down-regulation to be consistent with recycling inhibition. Third, in contrast to the agonism associated with ligand-induced down-regulation, we demonstrate that mAb-induced down-regulation does not activate EGFR or its downstream effectors and it leads to synergistic reduction in migration and proliferation of cells that secrete autocrine ligand. These new insights will aid in ongoing rational design of EGFR-targeted antibody therapeutics.

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