IGF1R signaling drives antiestrogen resistance through PAK2/PIX activation in luminal breast cancer
In: Oncogene, 37(14), 1869-1884. Nature Publishing Group; (2018-04-30)
Online
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Zugriff:
Antiestrogen resistance in estrogen receptor positive (ER+) breast cancer is associated with increased expression and activity of insulin-like growth factor 1 receptor (IGF1R). Here, a kinome siRNA screen has identified 10 regulators of IGF1R-mediated antiestrogen with clinical significance. These include the tamoxifen resistance suppressors BMPR1B, CDK10, CDK5, EIF2AK1, and MAP2K5, and the tamoxifen resistance inducers CHEK1, PAK2, RPS6KC1, TTK, and TXK. The p21-activated kinase 2, PAK2, is the strongest resistance inducer. Silencing of the tamoxifen resistance inducing genes, particularly PAK2, attenuates IGF1R-mediated resistance to tamoxifen and fulvestrant. High expression of PAK2 in ER+ metastatic breast cancer patients is correlated with unfavorable outcome after first-line tamoxifen monotherapy. Phospho-proteomics has defined PAK2 and the PAK-interacting exchange factors PIXα/β as downstream targets of IGF1R signaling, which are independent from PI3K/ATK and MAPK/ERK pathways. PAK2 and PIXα/β modulate IGF1R signaling-driven cell scattering. Targeting PIXα/β entirely mimics the effect of PAK2 silencing on antiestrogen re-sensitization. These data indicate PAK2/PIX as an effector pathway in IGF1R-mediated antiestrogen resistance.
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IGF1R signaling drives antiestrogen resistance through PAK2/PIX activation in luminal breast cancer
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Autor/in / Beteiligte Person: | Wester, Lynn ; Marjo de Graauw ; Geiger, Tamar ; John W.M. Martens ; Zhang, Yinghui ; Pont, Chantal ; Bob van de Water ; Helmijr, Jean A. ; Maurice P.H.M. Jansen ; Look, Maxime P. ; Moerkens, Marja ; Caroline H M van Deurzen ; Meerman, John H. N. ; Els M.J.J. Berns ; Erik H.J. Danen ; Timmermans, Mieke M. ; Siddappa, Ram ; He, Jichao ; Pathology ; Oncology, Medical |
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Quelle: | Oncogene, 37(14), 1869-1884. Nature Publishing Group; (2018-04-30) |
Veröffentlichung: | 2018 |
Medientyp: | unknown |
ISSN: | 0950-9232 (print) |
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