The flavonoid luteolin is a natural antioxidant that usually occurs in its glycosylated form in many green vegetables, and has shown anticancer effects against various cancers. However, the potential tumor-suppressive role of luteolin in thyroid carcinoma and its underlying mechanism remain largely unknown. In current study, SBR assay, clone formation assay were employed to evaluate the effects of luteolin on thyroid cancer. We found that luteolin significantly inhibits thyroid cancer growth. The further mechanisms of its anticancer activity were analyzed by flow cytometry, quantitative real-time PCR, and Western blotting. We found that luteolin decreased the expression of BRAF-activated long noncoding RNA (BANCR), which further led to downregulation of TSHR and downstream oncogenic signaling. Moreover, overexpression of BANCR/TSHR signaling can largely abolish the anti-tumor effects of luteolin on thyroid carcinoma in vitro and in vivo. In conclusion, luteolin may serve as a potential important anticancer agent for thyroid carcinoma by blocking the BANCR/TSHR signaling.
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