Abstract
Growing evidence suggests that overexpression of TrkC, a member of the Trk family of neurotrophin receptors, could drive tumorigenesis, invasion and metastatic capability in cancer cells. However, relatively little is known about the mechanism of TrkC-mediated oncogenesis. The TrkC gene is a partner of the Tel-TrkC (ETV6-NTRK3) chimeric tyrosine kinase, a potent oncoprotein expressed in tumors derived from multiple cell lineages. Recently, we have shown that ETV6-NTRK3 suppresses transforming growth factor-β (TGF-β) signaling by directly binding to the type II TGF-β receptor (TβRII). Here, we report that expression of TrkC also suppresses TGF-β-induced Smad2/3 phosphorylation and transcriptional activation. Silencing TrkC expression by small interfering RNA in the highly metastatic 4T1 mammary tumor cell line expressing endogenous TrkC significantly enhanced TGF-β-induced Smad2/3 phosphorylation and restored TGF-β growth inhibitory activity. In contrast, expression of TrkC in 67NR cells, in which TrkC is not expressed, suppressed TGF-β transcriptional activation. Moreover, we show that TrkC directly binds to the TβRII, thereby preventing it from interacting with the type I TGF-β receptor (TβRI). These results indicate that TrkC is an inhibitor of TGF-β tumor suppressor activity.
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Acknowledgements
This research was supported by the Intramural Research Program of the National Cancer Institute, National Institutes of Health, Bethesda, MD, USA. We thank E Kohn and A Hobbie for the critical reading of the manuscript.
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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc).
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Jin, W., Yun, C., Kwak, MK. et al. TrkC binds to the type II TGF-β receptor to suppress TGF-β signaling. Oncogene 26, 7684–7691 (2007). https://doi.org/10.1038/sj.onc.1210571
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DOI: https://doi.org/10.1038/sj.onc.1210571
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