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Autocrine stimulation by osteopontin plays a pivotal role in the expression of the mitogenic and invasive phenotype of RET/PTC-transformed thyroid cells

Abstract

Papillary thyroid carcinomas are characterized by rearrangements of the RET receptor tyrosine kinase generating RET/PTC oncogenes. Here we show that osteopontin (OPN), a secreted glycoprotein, is a major RET/PTC-induced transcriptional target in PC Cl 3 thyroid follicular cells. OPN upregulation depended on the integrity of the RET/PTC kinase and tyrosines Y1015 and Y1062, two major RET/PTC autophosphorylation sites. RET/PTC also induced a strong overexpression of CD44, a cell surface signalling receptor for OPN. Upregulation of CD44 was dependent on RET/PTC Y1062, as well. Constitutive OPN overexpression or treatment with exogenous recombinant OPN sharply increased proliferation, Matrigel invasion and spreading in collagen gels of RET/PTC-transformed PC Cl 3 cells. These effects were impaired by the treatment of PC Cl 3-RET/PTC cells with OPN- and CD44-locking antibodies. Thus, RET/PTC signalling triggers an autocrine loop involving OPN and CD44 that sustains proliferation and invasion of transfomed PC Cl 3 thyrocytes.

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Acknowledgements

We thank J Fagin for RET/PTC inducible cells and F Carlomagno for ZD6474 experiment. This study was supported by the Associazione Italiana per la Ricerca sul Cancro (AIRC), the EC grant FIGH-CT1999-CHIPS, the Progetto Strategico Oncologia of the CNR/MIUR, grants from the Ministero per l'Istruzione, Università e Ricerca Scientifica (MIUR) and the Ministero della Salute. VG was recipient of a fellowship of the BioGeM s.c.ar.l. (Biotecnologia e Genetica Molecolare nel Mezzogiorno d'Italia).

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Correspondence to Massimo Santoro.

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Castellone, M., Celetti, A., Guarino, V. et al. Autocrine stimulation by osteopontin plays a pivotal role in the expression of the mitogenic and invasive phenotype of RET/PTC-transformed thyroid cells. Oncogene 23, 2188–2196 (2004). https://doi.org/10.1038/sj.onc.1207322

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