Abstract
Sunitinib malate (Sutent, Pfizer, Inc.; SU11248) is a selective, multitargeted inhibitor of receptor tyrosine kinases and has been shown to inhibit receptors for VEGF, PDGF, KIT, FLT3, and RET. The objective of this study was to determine the effects of sunitinib on signal transduction pathways and on gene expression of iodide-metabolizing proteins in papillary cancer cells with the RET/PTC1 rearrangement. We investigated the effects of sunitinib on cell growth, signal transduction pathways, and thyroid-specific gene expression in papillary thyroid cancer (PTC) cell lines that had the RET/PTC1 rearrangement. Sunitinib inhibited proliferation of RET/PTC1 subclones in a time- and dose-related manner. The mean 50% lethal concentration in the RET/PTC1 subclones was 1.81 microM. Incubation of RET/PTC1 cells with 1 microM sunitinib inhibited their migration potential and transformed their morphology. Sunitinib inhibited RET autophosphorylation at Y1062 and the activation of signal transducer and activator of transcription 3 by blocking Y705 phosphorylation. Sunitinib caused cell cycle arrest in the G0/G1 phase and dephosphorylation of retinoblastoma protein, but did not induce apoptosis. Western blot analysis of the p38, MEK/ERK, and...Continue Reading
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