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Forkhead box K1 facilitates growth of papillary thyroid carcinoma cells by regulating connective tissue growth factor expression.
Human Cell 2020 October 25
Forkhead box (FOX) proteins have been identified as key transcription factors in diverse biological processes involved in tumor progression. A large number of FOX proteins are implicated in tumorigenesis of papillary thyroid carcinoma (PTC). Here we investigated the role of Forkhead box K1 (FOXK1) in PTC progression. First, we found that FOXK1 was elevated in both PTC tissues (N = 68) and cell lines. Moreover, up-regulated FOXK1 was associated with shorter overall survival of PTC patients. Second, in vitro functional assays showed that FOXK1 promoted progression of PTC. Mechanistically, FOXK1 could bind to the promoter of cysteine-rich angiogenic inducer 61 (CYR61) and regulate connective tissue growth factor (CTGF) expression through CYR61. Notably, over-expression of CTGF weakened suppression of PTC progression induced by FOXK1 knockdown. Finally, in vivo xenotransplant tumor model indicated that knockdown of FOXK1 suppressed PTC growth. In conclusion, our results indicate that FOXK1 exerts oncogenic roles in PTC via CYR61/CTGF axis, which suggests FOXK1 might act as a potential therapeutic target.
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