1. Academic Validation
  2. SGX523 is an exquisitely selective, ATP-competitive inhibitor of the MET receptor tyrosine kinase with antitumor activity in vivo

SGX523 is an exquisitely selective, ATP-competitive inhibitor of the MET receptor tyrosine kinase with antitumor activity in vivo

  • Mol Cancer Ther. 2009 Dec;8(12):3181-90. doi: 10.1158/1535-7163.MCT-09-0477.
Sean G Buchanan 1 Jorg Hendle Patrick S Lee Christopher R Smith Pierre-Yves Bounaud Katti A Jessen Crystal M Tang Nanni H Huser Jeremy D Felce Karen J Froning Marshall C Peterman Brandon E Aubol Steve F Gessert J Michael Sauder Kenneth D Schwinn Marijane Russell Isabelle A Rooney Jason Adams Barbara C Leon Tuan H Do Jeff M Blaney Paul A Sprengeler Devon A Thompson Lydia Smyth Laura A Pelletier Shane Atwell Kevin Holme Stephen R Wasserman Spencer Emtage Stephen K Burley Siegfried H Reich
Affiliations

Affiliation

  • 1 SGX Pharmaceuticals, San Diego, CA 92121, USA. buchanan_sean@lilly.com
Abstract

The MET receptor tyrosine kinase has emerged as an important target for the development of novel Cancer therapeutics. Activation of MET by mutation or gene amplification has been linked to kidney, gastric, and lung cancers. In other cancers, such as glioblastoma, autocrine activation of MET has been demonstrated. Several classes of ATP-competitive inhibitor have been described, which inhibit MET but also other kinases. Here, we describe SGX523, a novel, ATP-competitive kinase inhibitor remarkable for its exquisite selectivity for MET. SGX523 potently inhibited MET with an IC50 of 4 nmol/L and is >1,000-fold selective versus the >200-fold selectivity of other protein kinases tested in biochemical assays. Crystallographic study revealed that SGX523 stabilizes MET in a unique inactive conformation that is inaccessible to other protein kinases, suggesting an explanation for the selectivity. SGX523 inhibited MET-mediated signaling, cell proliferation, and cell migration at nanomolar concentrations but had no effect on signaling dependent on other protein kinases, including the closely related RON, even at micromolar concentrations. SGX523 inhibition of MET in vivo was associated with the dose-dependent inhibition of growth of tumor xenografts derived from human glioblastoma and lung and gastric cancers, confirming the dependence of these tumors on MET catalytic activity. Our results show that SGX523 is the most selective inhibitor of MET catalytic activity described to date and is thus a useful tool to investigate the role of MET kinase in Cancer without the confounding effects of promiscuous protein kinase inhibition.

Figures
Products
  • Cat. No.
    Product Name
    Description
    Target
    Research Area
  • HY-12019
    ≥99.0%, MET 抑制剂