Antitumor activity of SNX-2112, a synthetic heat shock protein-90 inhibitor, in Met-amplified tumor cells with or without resistance to selective MET inhibition Journal Article


Authors: Bachleitner-Hofmann, T.; Sun, M. Y.; Chen, C. T.; Liska, D.; Zeng, Z.; Viale, A.; Olshen, A. B.; Mittlboeck, M.; Christensen, J. G.; Rosen, N.; Solit, D. B.; Weiser, M. R.
Article Title: Antitumor activity of SNX-2112, a synthetic heat shock protein-90 inhibitor, in Met-amplified tumor cells with or without resistance to selective MET inhibition
Abstract: Purpose: Heat shock protein-90 (HSP-90), a molecular chaperone required by numerous oncogenic kinases [e.g., HER-2, epidermal growth factor receptor (EGFR), Raf-1, v-Src, and AKT] for conformational stability, has attracted wide interest as a novel target for cancer therapy. HSP-90 inhibition induces degradation of HSP-90 client proteins, leading to a combinatorial inhibition of multiple oncogenic signaling pathways with consecutive growth arrest and apoptosis. MET, a tyrosine kinase that is constitutively active in tumor cells with MET oncogene amplification, has recently been identified as another HSP-90 client. Experimental Design: The aim of our study was to assess the efficacy of SNX-2112, a synthetic HSP-90 inhibitor, in 3 different MET-amplified tumor cell lines (GTL-16, MKN-45, and EBC-1) as well as PR-GTL-16 cells, a GTL-16 subline selected for resistance to the highly selective MET kinase inhibitor PHA-665752. Results: In all cell lines, SNX-2112 led to degradation of MET, HER-2, EGFR, and AKT, as well as abrogation of Ras/Raf/MEK/MAPK and PI3K/AKT signaling, followed by complete cell cycle arrest. SNX-5542, an orally bioavailable prodrug of SNX-2112, displayed significant antitumor efficacy in vivo in nude mice bearing MET-amplified tumor xenografts. Importantly, HSP-90 inhibition maintained its antitumor efficacy in PR-GTL-16 cells both in vitro and in vivo, suggesting that HSP-90 inhibition could be a particularly valuable strategy in MET-amplified tumors that have acquired resistance to MET kinase inhibition. Conclusions: Our study provides evidence for the efficacy of HSP-90 inhibition in MET-amplified cancer cells, particularly when MET kinase inhibitor resistance has emerged. © 2011 AACR.
Keywords: protein kinase b; controlled study; unclassified drug; human cell; drug dose comparison; drug dose reduction; drug efficacy; nonhuman; mouse; animal tissue; apoptosis; gene amplification; protein degradation; epidermal growth factor receptor; epidermal growth factor receptor 2; animal experiment; animal model; antineoplastic activity; cancer cell culture; tumor xenograft; protein tyrosine kinase; cancer therapy; oncogene; nude mouse; cancer cell; tumor cell line; heat shock protein 90 inhibitor; cell cycle arrest; drug bioavailability; tumor; drug dose increase; prodrug; snx 2112; tyrosine kinase met
Journal Title: Clinical Cancer Research
Volume: 17
Issue: 1
ISSN: 1078-0432
Publisher: American Association for Cancer Research  
Date Published: 2011-01-01
Start Page: 122
End Page: 133
Language: English
DOI: 10.1158/1078-0432.ccr-10-0253
PROVIDER: scopus
PUBMED: 21208906
PMCID: PMC3263825
DOI/URL:
Notes: --- - "Export Date: 4 March 2011" - "CODEN: CCREF" - "Source: Scopus"
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MSK Authors
  1. Neal Rosen
    356 Rosen
  2. David Solit
    431 Solit
  3. Mark Y Sun
    10 Sun
  4. Zhaoshi Zeng
    82 Zeng
  5. David Liska
    13 Liska
  6. Martin R Weiser
    338 Weiser
  7. Adam B Olshen
    107 Olshen
  8. Agnes Viale
    205 Viale
  9. Chin-Tung Chen
    33 Chen