RAGE mediates the pro-migratory response of extracellular S100A4 in human thyroid cancer cells

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Item Type:	Article
Title:	RAGE mediates the pro-migratory response of extracellular S100A4 in human thyroid cancer cells
Creators Name:	Medapati, M.R., Dahlmann, M., Ghavami, S., Pathak, K.A., Lucman, L., Klonisch, T., Hoang-Vu, C., Stein, U. and Hombach-Klonisch, S.
Abstract:	BACKGROUND: Expression of the small calcium-binding protein S100A4 is associated with poor prognosis in patients with thyroid cancer (TC). The authors have previously shown that S100A4 is a target for relaxin and insulin-like peptide 3 signaling in TC cells and that S100A4 is secreted from human TC cells. Although the pro-migratory role of intracellular S100A4 in binding to non-muscle myosin is well known, this study investigated here whether extracellular S100A4 contributes to TC migration. METHODS: Human cell lines of follicular, papillary, and undifferentiated thyroid cancer, primary patient TC cells, and TC tissues were utilized to discover the presence of the receptor of advanced glycation end products (RAGE) in TC cells and TC tissues. Fluorescence imaging, protein pull-down assays, Western blot, siRNA protein silencing, small GTPase inhibitors, cell proliferation, and cell migration assays were used to investigate the interaction of extracellular S100A4 with RAGE in promoting a TC migratory response. RESULTS: It was demonstrated that RAGE served as receptor for extracellular S100A4 mediating cell migration in TC cells. The RAGE-mediated increase in cell migration was dependent on the intracellular RAGE signaling partner diaphanous-1 (Dia-1) and involved the activation of the small GTPases Cdc42 and RhoA. Although extracellular S100A4 consistently activated ERK signaling in TC cells, it was shown that ERK signaling was not mediated by RAGE and not essential for the migratory response in TC cells. CONCLUSION: The data have identified the RAGE/Dia-1 signaling system as a mediator for the pro-migratory response of extracellular S100A4 in human TC. Thus, therapeutic targeting of the RAGE/Dia-1/small GTPases signaling may successfully reduce local invasion and metastasis in TC.
Keywords:	Advanced Glycosylation End Product-Specific Receptor, Cell Movement, Cell Proliferation, Enzyme Inhibitors, Follicular Adenocarcinoma, Papillary Carcinoma, Prognosis, Small Interfering RNA, S100 Proteins, Signal Transduction, Thyroid Neoplasms, Tumor Cell Line, cdc42 GTP-Binding Protein, {rho}A GTP-Binding Protein
Source:	Thyroid
ISSN:	1050-7256
Publisher:	Mary Ann Liebert
Volume:	25
Number:	5
Page Range:	514-527
Date:	4 May 2015
Official Publication:	https://doi.org/10.1089/thy.2014.0257
PubMed:	View item in PubMed

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