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Ref Type Journal Article
PMID (22351686)
Authors Paraiso KH, Haarberg HE, Wood E, Rebecca VW, Chen YA, Xiang Y, Ribas A, Lo RS, Weber JS, Sondak VK, John JK, Sarnaik AA, Koomen JM, Smalley KS
Title The HSP90 inhibitor XL888 overcomes BRAF inhibitor resistance mediated through diverse mechanisms.
Journal Clinical cancer research : an official journal of the American Association for Cancer Research
Vol 18
Issue 9
Date 2012 May 01
URL
Abstract Text The clinical use of BRAF inhibitors is being hampered by the acquisition of drug resistance. This study shows the potential therapeutic use of the HSP90 inhibitor (XL888) in six different models of vemurafenib resistance.The ability of XL888 to inhibit growth and to induce apoptosis and tumor regression of vemurafenib-resistant melanoma cell lines was shown in vitro and in vivo. A novel mass spectrometry-based pharmacodynamic assay was developed to measure intratumoral HSP70 levels following HSP90 inhibition in melanoma cell lines, xenografts, and melanoma biopsies. Mechanistic studies were carried out to determine the mechanism of XL888-induced apoptosis.XL888 potently inhibited cell growth, induced apoptosis, and prevented the growth of vemurafenib-resistant melanoma cell lines in 3-dimensional cell culture, long-term colony formation assays, and human melanoma mouse xenografts. The reversal of the resistance phenotype was associated with the degradation of PDGFRβ, COT, IGFR1, CRAF, ARAF, S6, cyclin D1, and AKT, which in turn led to the nuclear accumulation of FOXO3a, an increase in BIM (Bcl-2 interacting mediator of cell death) expression, and the downregulation of Mcl-1. In most resistance models, XL888 treatment increased BIM expression, decreased Mcl-1 expression, and induced apoptosis more effectively than dual mitogen-activated protein-extracellular signal-regulated kinase/phosphoinositide 3-kinase (MEK/PI3K) inhibition.HSP90 inhibition may be a highly effective strategy at managing the diverse array of resistance mechanisms being reported to BRAF inhibitors and appears to be more effective at restoring BIM expression and downregulating Mcl-1 expression than combined MEK/PI3K inhibitor therapy.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
BRAF V600E PDGFRB over exp melanoma sensitive XL888 Preclinical - Cell line xenograft Actionable In a preclinical study, treatment with XL888 increased apoptosis and decreased growth of Zelboraf (vemurafenib)-resistant human melanoma cell lines harboring a BRAF V600E mutation and over expression of PDGFRB in cell culture and in xenograft models (PMID: 22351686). 22351686
BRAF V600E NRAS Q61K melanoma sensitive XL888 Preclinical Actionable In a preclinical study, treatment with XL888 resulted in increased apoptosis and decreased growth of Zelboraf (vemurafenib)-resistant melanoma cells harboring BRAF V600E along with NRAS Q61K in cell culture (PMID: 22351686). 22351686