T-LAK cell-originated protein kinase (TOPK) is a Novel Prognostic and Therapeutic Target in Chordoma.

Abstract:

OBJECTIVES:To assess the expression, prognostic value, and functionality of T-lymphokine-activated killer (T-LAK) cell-originated protein kinase (TOPK) in chordoma pathogenesis. MATERIALS AND METHODS:TOPK expression in chordoma was assessed via immunohistochemical staining of a tissue microarray (TMA) and correlated with patient clinicopathology. TOPK expression in chordoma cell lines and fresh patient tissues was then evaluated by Western blot. TOPK small interfering RNA (siRNA) and the specific inhibitor OTS514 were applied to determine the roles of TOPK in chordoma pathogenicity. The effect of TOPK expression on chordoma cell clonogenicity was also investigated using clonogenic assays. A 3D cell culture model was utilized to mimic in vivo environment to validate the effect of TOPK inhibition on chordoma cells. RESULTS:TOPK was highly expressed in 78.2% of the chordoma specimens in the TMA and all chordoma cell lines. High TOPK expression significantly correlated with metastasis, recurrence, disease status and shorter overall survival. Knockdown of TOPK with specific siRNA resulted in significantly decrease chordoma cell viability. Inhibition of TOPK with OTS514 significantly inhibited chordoma cell growth and proliferation, colony-forming capacity and ex vivo spheroid growth. CONCLUSIONS:High expression of TOPK is an important predictor of poor prognosis in chordoma. Inhibition of TOPK resulted in significantly decrease chordoma cell proliferation and increase apoptosis. Our results indicate TOPK as a novel prognostic biomarker and therapeutic target for chordoma.

journal_name

Cell Prolif

journal_title

Cell proliferation

authors

Thanindratarn P,Dean DC,Nelson SD,Hornicek FJ,Duan Z

doi

10.1111/cpr.12901

subject

Has Abstract

pub_date

2020-10-01 00:00:00

pages

e12901

issue

10

eissn

0960-7722

issn

1365-2184

journal_volume

53

pub_type

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