Abstract:
:Raf inhibitors are under clinical investigation, specifically in patients with tumor types harboring frequent activating mutations in B-Raf. Here, we show that cell lines and tumors harboring mutant B-Raf were sensitive to a novel series of Raf inhibitors (e.g., (V600E)B-Raf A375, IC(50) on cells = 2 nmol/L; ED(50) on tumor xenografts = 1.3 mg/kg). However, in cells and tumors with wild-type B-Raf, exposure to Raf inhibitors resulted in a dose-dependent and sustained activation of mitogen-activated protein kinase signaling. In some of these cell lines, Raf inhibition led to entry into the cell cycle, enhanced proliferation, and significantly stimulated tumor growth in vivo. Inhibition with structurally distinct Raf inhibitors or isoform-specific small interfering RNA knockdown of Raf showed that these effects were mediated directly through Raf. Either A-Raf or C-Raf mediated the Raf inhibitor-induced mitogen-activated protein kinase pathway activation in an inhibitor-specific manner. These paradoxical effects of Raf inhibition were seen in malignant and normal cells in vitro and in vivo. Hyperplasia of normal epithelial cells in the esophagus and the stomach was evident in mice with all efficacious Raf inhibitors (n = 8) tested. An implication of these results is that Raf inhibitors may induce unexpected normal cell and tumor tissue proliferation in patients.
journal_name
Mol Cancer Therjournal_title
Molecular cancer therapeuticsauthors
Carnahan J,Beltran PJ,Babij C,Le Q,Rose MJ,Vonderfecht S,Kim JL,Smith AL,Nagapudi K,Broome MA,Fernando M,Kha H,Belmontes B,Radinsky R,Kendall R,Burgess TLdoi
10.1158/1535-7163.MCT-10-0181subject
Has Abstractpub_date
2010-08-01 00:00:00pages
2399-410issue
8eissn
1535-7163issn
1538-8514pii
1535-7163.MCT-10-0181journal_volume
9pub_type
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