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TPX2 Overexpression in Medullary Thyroid Carcinoma Mediates TT Cell Proliferation

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Pathology & Oncology Research

Abstract

TPX2 (targeting protein for xenopus kinesin-like protein 2), a microtubule-associated protein, plays an important role in the formation of the mitotic spindle. Abnormal expression of TPX2 in various types of malignant tumors has been reported, but less is known for medullary thyroid cancer (MTC). We investigated the expression of TPX2 in human MTC tissues and its potential use as a therapeutic target. Immunohistochemical analysis of TPX2 expression was performed for 32 cases of MTC and 8 cases of normal thyroid. TPX2 expression was found to be significantly higher in MTC compared to normal thyroid tissues (P < 0.05), and to be associated with tumor size, lymph node metastasis, and advanced disease stage. The cellular effects of TPX2 knockdown, including cell proliferation, apoptosis, cell cycle diffusions, and mitotic gene expression were investigated using small interfering RNA (siRNA). TPX2-siRNA caused G1 and G2-phase cell cycle arrest, inhibited cell proliferation, and induced apoptosis. TPX2-siRNA also downregulated Aurora-A and cyclinB1 protein expression in MTC cells and enhanced the expression of p53 protein (P < 0.05). These results suggest that TPX2 may be of potential use as a new marker for MTC prognosis and therapy.

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All authors have no conflicts of interest.

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Authors and Affiliations

  1. Department of Endocrinology (Section I), Tangshan Workers Hospital, Tangshan, China

    Xiaolin Yang, Geling Liu, Hongzhen Xiao, Fang Yu, Xiuxiu Xiang, Yifang Lu, Weijuan Li, Xiuling Liu, Sha Li & Yanping Shi

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  1. Xiaolin Yang
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  2. Geling Liu
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  3. Hongzhen Xiao
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  4. Fang Yu
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  5. Xiuxiu Xiang
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  6. Yifang Lu
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  7. Weijuan Li
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  8. Xiuling Liu
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  9. Sha Li
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  10. Yanping Shi
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Correspondence to Geling Liu.

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Xiaolin Yang and Geling Liu contributed equally to this work.

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Yang, X., Liu, G., Xiao, H. et al. TPX2 Overexpression in Medullary Thyroid Carcinoma Mediates TT Cell Proliferation. Pathol. Oncol. Res. 20, 641–648 (2014). https://doi.org/10.1007/s12253-014-9743-4

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  • DOI: https://doi.org/10.1007/s12253-014-9743-4

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