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Targeting of EGFR by a combination of antibodies mediates unconventional EGFR trafficking and degradation

Jones, Sylwia, King, Peter J., Antonescu, Costin N., Sugiyama, Michael G., Bhamra, Amandeep, Surinova, Silvia, Angelopoulos, Nicos, Kragh, Michael, Pedersen, Mikkel W., Hartley, John A., Futter, Clare E. and Hochhauser, Daniel 2020. Targeting of EGFR by a combination of antibodies mediates unconventional EGFR trafficking and degradation. Scientific Reports 10 (1) , 663. 10.1038/s41598-019-57153-9

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Abstract

Antibody combinations targeting cell surface receptors are a new modality of cancer therapy. The trafficking and signalling mechanisms regulated by such therapeutics are not fully understood but could underlie differential tumour responses. We explored EGFR trafficking upon treatment with the antibody combination Sym004 which has shown promise clinically. Sym004 promoted EGFR endocytosis distinctly from EGF: it was asynchronous, not accompanied by canonical signalling events and involved EGFR clustering within detergent-insoluble plasma mebrane-associated tubules. Sym004 induced lysosomal degradation independently of EGFR ubiquitylation but dependent upon Hrs/Tsg101 that are required for the formation of intraluminal vesicles (ILVs) within late endosomes. We propose Sym004 cross-links EGFR physically triggering EGFR endocytosis and incorporation onto ILVs and so Sym004 sensitivity correlates with EGFR numbers available for binding, rather than specific signalling events. Consistently Sym004 efficacy and potentiation of cisplatin responses correlated with EGFR surface expression in head and neck cancer cells. These findings will have implications in understanding the mode of action of this new class of cancer therapeutics.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Medicine
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 29 July 2020
Date of Acceptance: 2 December 2019
Last Modified: 29 Jul 2020 12:30
URI: http://orca.cf.ac.uk/id/eprint/133795

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