Title |
BRAF Inhibitors Induce Metastasis in RAS Mutant or Inhibitor-Resistant Melanoma Cells by Reactivating MEK and ERK Signaling
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Published in |
Science Signaling, March 2014
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DOI | 10.1126/scisignal.2004815 |
Pubmed ID | |
Authors |
Berta Sanchez-Laorden, Amaya Viros, Maria Romina Girotti, Malin Pedersen, Grazia Saturno, Alfonso Zambon, Dan Niculescu-Duvaz, Samra Turajlic, Andrew Hayes, Martin Gore, James Larkin, Paul Lorigan, Martin Cook, Caroline Springer, Richard Marais |
Abstract |
Melanoma is a highly metastatic and lethal form of skin cancer. The protein kinase BRAF is mutated in about 40% of melanomas, and BRAF inhibitors improve progression-free and overall survival in these patients. However, after a relatively short period of disease control, most patients develop resistance because of reactivation of the RAF-ERK (extracellular signal-regulated kinase) pathway, mediated in many cases by mutations in RAS. We found that BRAF inhibition induces invasion and metastasis in RAS mutant melanoma cells through a mechanism mediated by the reactivation of the MEK (mitogen-activated protein kinase kinase)-ERK pathway, increased expression and secretion of interleukin 8, and induction of protease-dependent invasion. These events were accompanied by a cell morphology switch from predominantly rounded to predominantly elongated cells. We also observed similar responses in BRAF inhibitor-resistant melanoma cells. These data show that BRAF inhibitors can induce melanoma cell invasion and metastasis in tumors that develop resistance to these drugs. |
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