TORC1 suppression predicts responsiveness to RAF and MEK inhibition in BRAF-mutant melanoma.
TORC1 suppression predicts responsiveness to RAF and MEK inhibition in BRAF-mutant melanoma.
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DOI:
10.1126/scitranslmed.3005753
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发表时间:
2013-07-31
影响因子:
17.1
通讯作者:
Engelman JA
中科院分区:
文献类型:
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作者:
Corcoran RB;Rothenberg SM;Hata AN;Faber AC;Piris A;Nazarian RM;Brown RD;Godfrey JT;Winokur D;Walsh J;Mino-Kenudson M;Maheswaran S;Settleman J;Wargo JA;Flaherty KT;Haber DA;Engelman JA
RAF and MEK (mitogen-activated or extracellular signal–regulated protein kinase kinase) inhibitors are effective in treating patients with BRAF-mutant melanoma. However, most responses are partial and short-lived, and many patients fail to respond at all. We found that suppression of TORC1 activity in response to RAF or MEK inhibitors, as measured by decreased phosphorylation of ribosomal protein S6 (P-S6), effectively predicted induction of cell death by the inhibitor in BRAF-mutant melanoma cell lines. In resistant melanomas, TORC1 activity was maintained after treatment with RAF or MEK inhibitors, in some cases despite robust suppression of mitogen-activated protein kinase (MAPK) signaling. In in vivo mouse models, suppression of TORC1 after MAPK inhibition was necessary for induction of apoptosis and tumor response. Finally, in paired biopsies obtained from patients with BRAF-mutant melanoma before treatment and after initiation of RAF inhibitor therapy, P-S6 suppression predicted significantly improved progression-free survival. Such a change in P-S6 could be readily monitored in real time by serial fine-needle aspiration biopsies, making quantitation of P-S6 a valuable biomarker to guide treatment in BRAF-mutant melanoma.
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Davies MA
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影响因子:
7.3
作者:
Corcoran RB;Dias-Santagata D;Bergethon K;Iafrate AJ;Settleman J;Engelman JA
通讯作者:
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影响因子:
64.8
作者:
通讯作者:
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