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Published in: Journal of Cancer Research and Clinical Oncology 6/2015

01-06-2015 | Original Article – Cancer Research

In vitro effects and ex vivo binding of an EGFR-specific immunotoxin on rhabdomyosarcoma cells

Authors: Judith Niesen, Hannes Brehm, Christoph Stein, Nina Berges, Alessa Pardo, Rainer Fischer, Andre ten Haaf, Stefan Gattenlöhner, Mehmet K. Tur, Stefan Barth

Published in: Journal of Cancer Research and Clinical Oncology | Issue 6/2015

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Abstract

Purpose

Rhabdomyosarcoma (RMS) is a rare and aggressive soft tissue sarcoma with limited treatment options and a high failure rate during standard therapy. New therapeutic strategies based on targeted immunotherapy are therefore much in demand. The epidermal growth factor receptor (EGFR) has all the characteristics of an ideal target. It is overexpressed in up to 80 % of embryonal RMS and up to 50 % of alveolar RMS tumors. We therefore tested the activity of the EGFR-specific recombinant immunotoxin (IT) 425(scFv)-ETA′ against EGFR+ RMS cells in vitro and ex vivo.

Methods

We tested the specific binding and internalization behavior of 425(scFv)-ETA′ in RMS cell lines in vitro by flow cytometry, compared to the corresponding imaging probe 425(scFv)-SNAP monitored by live cell imaging. The cytotoxic activity of 425(scFv)-ETA′ was tested using cell viability and apoptosis assays. Specific binding of the IT was confirmed on formalin-fixed paraffin-embedded tissue samples from two RMS patients.

Results

We confirmed the specific binding of 425(scFv)-ETA′ to RMS cells in vitro and ex vivo. Both the IT and the corresponding imaging probe were rapidly internalized. The IT killed EGFR+ RMS cells in a dose-dependent manner, while showing no effect against control cells. It showed specific apoptotic activity against one selected RMS cell line.

Conclusions

This is the first study showing the promising therapeutic potential of a recombinant, EGFR-targeting, ETA′-based IT on RMS cells. We confirmed the selective killing with IC50 values of up to 50 pM, and immunohistochemical staining confirmed the specific ex vivo binding to primary RMS material.
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Metadata
Title
In vitro effects and ex vivo binding of an EGFR-specific immunotoxin on rhabdomyosarcoma cells
Authors
Judith Niesen
Hannes Brehm
Christoph Stein
Nina Berges
Alessa Pardo
Rainer Fischer
Andre ten Haaf
Stefan Gattenlöhner
Mehmet K. Tur
Stefan Barth
Publication date
01-06-2015
Publisher
Springer Berlin Heidelberg
Published in
Journal of Cancer Research and Clinical Oncology / Issue 6/2015
Print ISSN: 0171-5216
Electronic ISSN: 1432-1335
DOI
https://doi.org/10.1007/s00432-014-1884-z

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