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Cancer Research 67, 11821, December 15, 2007. doi: 10.1158/0008-5472.CAN-07-0899
© 2007 American Association for Cancer Research

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Experimental Therapeutics, Molecular Targets, and Chemical Biology

Biological Role and Potential Therapeutic Targeting of the Chemokine Receptor CXCR4 in Undifferentiated Thyroid Cancer

Valentina De Falco1, Valentina Guarino1, Elvira Avilla1, Maria Domenica Castellone1, Paolo Salerno1, Giuliana Salvatore2, Pinuccia Faviana3, Fulvio Basolo3, Massimo Santoro1 and Rosa Marina Melillo1

1 Dipartimento di Biologia e Patologia Cellulare e Molecolare c/o Istituto di Endocrinologia ed Oncologia Sperimentale del CNR "G. Salvatore," Facolta' di Medicina e Facolta' di Scienze Biotecnologiche dell‘Universita’ "Federico II"; 2 Dipartimento di Studi delle Istituzioni e dei Sistemi Territoriali, Universita' "Parthenope," Naples, Italy; and 3 Dipartimento di Chirurgia, Universita' di Pisa, Pisa, Italy

Requests for reprints: Rosa Marina Melillo, Istituto di Endocrinologia ed Oncologia Sperimentale del CNR, via S. Pansini 5, 80131 Naples, Italy. Phone: 39-081-7463603; Fax: 39-081-7463603; E-mail: rosmelil{at}unina.it.

Anaplastic thyroid carcinoma (ATC) is a rare thyroid cancer type with an extremely poor prognosis. Despite appropriate treatment, which includes surgery, radiotherapy, and chemotherapy, this cancer is invariably fatal. CXCR4 is the receptor for the stromal cell–derived factor-1 (SDF-1)/CXCL12 chemokine and it is expressed in a variety of solid tumors, including papillary thyroid carcinoma. Here, we show that ATC cell lines overexpress CXCR4, both at the level of mRNA and protein. Furthermore, we found that CXCR4 was overexpressed in ATC clinical samples, with respect to normal thyroid tissues by real-time PCR and immunohistochemistry. Treatment of ATC cells with SDF-1 induced proliferation and increase in phosphorylation of extracellular signal–regulated kinases and protein kinase B/AKT. These effects were blocked by the specific CXCR4 antagonist AMD3100 and by CXCR4 RNA interference. Moreover, AMD3100 effectively reduced tumor growth in nude mice inoculated with different ATC cells. Thus, we suggest that CXCR4 targeting is a novel potential strategy in the treatment of human ATC. [Cancer Res 2007;67(24):11821–9]




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