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Src inhibitors in suppression of papillary thyroid carcinoma growth
Author(s) -
Henderson Ying C.,
Toro–Serra Rafael,
Chen Yunyun,
Ryu Junsun,
Frederick Mitchell J.,
Zhou Ge,
Gallick Gary E.,
Lai Stephen Y.,
Clayman Gary L.
Publication year - 2014
Publication title -
head and neck
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.012
H-Index - 127
eISSN - 1097-0347
pISSN - 1043-3074
DOI - 10.1002/hed.23316
Subject(s) - dasatinib , proto oncogene tyrosine protein kinase src , cancer research , thyroid carcinoma , signal transduction , biology , medicine , chemistry , tyrosine kinase , endocrinology , thyroid , microbiology and biotechnology
Background Papillary thyroid carcinoma is the most common thyroid malignancy. Most papillary thyroid carcinomas contain BRAF mutations or RET/PTC rearrangements, thus providing targets for biologic therapy. Our previous studies had suggested papillary thyroid carcinomas (PTCs) with a BRAF mutation and the RET/PTC1 rearrangement have different sensitivities to MEK1/2 inhibitors, suggesting different signaling transduction pathways were involved. Methods Src signaling transduction pathway in PTC cells was examined using Src inhibitors (PP2, SU6656, or dasatinib) and si‐Src RNA in vitro by Western blot analysis and proliferation analysis. An orthotopic xenograft mouse model was used for the in vivo studies using dasatinib. Results In PTC cells, Src inhibitors suppressed p‐Src and p‐FAK and inhibited cell growth. In addition, significant suppression and extension of the p‐ERK1/2 dephosphorylation were detected in RET/PTC1‐rearranged cells in combination with an MEK inhibitor (CI‐1040). The Src family kinase/ABL inhibitor, dasatinib, significantly decreased tumor volume in mice inoculated with PTC cells carrying the RET/PTC1 rearrangement. In BRAF‐mutated PTC cells, Src inhibitors effectively suppressed p‐Src expression and dasatinib significantly decreased tumor volume with twice daily treatment. Conclusion Src inhibitors effectively inhibited the Src signaling transduction pathway in PTC cells in vitro and dasatinib suppressed tumor growth in vivo. These results suggested that Src signaling transduction pathway plays an important role in regulating growth in PTC cells. Combination of Src and MEK1/2 inhibitors extended the dephosphorylation of extracellular signal‐regulated kinase (ERK)1/2 in PTCs carrying the RET/PTC1 rearrangement suggesting that combination therapy with complementary inhibitors of other signaling transduction pathways may be needed to effectively suppress growth and induce apoptosis in these cells. © 2013 Wiley Periodicals, Inc. Head Neck 36 : 375–384, 2014