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Study of the selectivity of insulin-like growth factor-1 receptor (IGF1R) inhibitors

Chene, Patrick and Hau, Jean-Christophe and Blechschmidt, Anke and Fontana, Patrizia and Bohn, Jacqueline and Zimmermann, Catherine and De Pover, Alain and Erdmann, Dirk (2010) Study of the selectivity of insulin-like growth factor-1 receptor (IGF1R) inhibitors. The open enzyme Inhibition Journal, 3 (1). pp. 27-37. ISSN 1874-9402

Abstract

The insulin-like growth factor-1 receptor (IGF1R) is a drug target for oncology, and many studies are ongoing to identify compounds that inhibit its tyrosine kinase activity. IGF1R is highly homologous to the insulin receptor (IR) and IGF1R inhibition might be beneficial for patients, while IR inhibition may lead to limiting toxicity. Therefore selectivity for IGF1R over IR is the aim for drug design in this context. A few compounds that selectively inhibit IGF1R over IR in cells have been identified, but none of them show the same levels of selectivity in enzymatic assays. To determine whether this discrepancy is linked to the conditions used in the enzymatic assays, we have studied the interaction between known IGF1R inhibitors (NVP-AEW541, OSI906, AG538, NVP-TAE226) and phosphorylated/unphosphorylated IGF1R/IR proteins with both biophysical (isothermal calorimetry and surface plasmon resonance) and enzymatic methods. In this report, we describe the results of this study and comment on the different degrees of selectivity IGF1R versus IR measured in biochemical and cellular assays. Finally, our study provides new information on the biochemical and mechanism of action of these small molecular weight IGF1R inhibitors

Item Type: Article
Keywords: IGF1R, kinase inhibitors, surface plasmon resonance, inhibitor selectivity
Date Deposited: 13 Oct 2015 13:16
Last Modified: 13 Oct 2015 13:16
URI: https://oak.novartis.com/id/eprint/2075

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