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Transl Oncol. 2016 Dec;9(6):540-547. doi: 10.1016/j.tranon.2016.09.002. Epub 2016 Nov 16.

The Role of PDGFR-β Activation in Acquired Resistance to IGF-1R Blockade in Preclinical Models of Rhabdomyosarcoma.

Translational oncology

Christine M Heske, Choh Yeung, Arnulfo Mendoza, Joshua T Baumgart, Leah D Edessa, Xiaolin Wan, Lee J Helman

Affiliations

  1. Pediatric Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA. Electronic address: [email protected].
  2. Pediatric Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.

PMID: 27835791 PMCID: PMC5114528 DOI: 10.1016/j.tranon.2016.09.002

Abstract

To determine what alternative pathways may act as mechanisms of bypass resistance to type 1 insulin-like growth factor receptor (IGF-1R) blockade in rhabdomyosarcoma (RMS), we compared expression of receptor tyrosine kinase activity in a number of IGF-1R antibody-resistant and -sensitive RMS cell lines. We found that platelet-derived growth factor receptor β (PDGFR-β) activity was upregulated in three xenograft-derived IGF-1R antibody-resistant cell lines that arose from a highly sensitive fusion-positive RMS cell line (Rh41). Furthermore, we identified four additional fusion-negative RMS cell lines that similarly upregulated PDGFR-β activity when selected for IGF-1R antibody resistance in vitro. In the seven cell lines described, we observed enhanced growth inhibition when cells were treated with dual IGF-1R and PDGFR-β inhibition in vitro. In vivo studies have confirmed the enhanced effect of targeting IGF-1R and PDGFR-β in several mouse xenograft models of fusion-negative RMS. These findings suggest that PDGFR-β acts as a bypass resistance pathway to IGF-1R inhibition in a subset of RMS. Therapy co-targeting these receptors may be a promising new strategy in RMS care.

Published by Elsevier Inc.

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