LncRNA XIST Promotes Migration and Invasion of Papillary Thyroid Cancer Cell by Modulating MiR-101-3p/CLDN1 Axis.

Papillary thyroid carcinoma (PTC) is the most common endocrine malignancy in the worlds. Long non-coding RNA X-inactive specific transcript (XIST) was found to upregulate in PTC tissues and cell lines. However, the molecular mechanism underlying PTC metastasis and whether XIST plays regulatory role in PTC are still largely unknown. qRT-PCR was performed to detect the expression of lncRNA XIST and mRNAs. Western blotting was carried out to detect CLDN1, MMP2, and MMP9. Transwell assay was used to detect migration and invasion. Starbase bioinformatics prediction and luciferase assay were used to validate the relationship of miR-101-3p and XIST or CLDN1. LncRNA XIST was upregulated in PTC tissues and cells. XIST knockdown suppressed migration and invasion of PTC cells. XIST could directly bind with miR-101-3p. Overexpression of miR-101-3p suppressed migration and invasion of PTC cells. CLDN1 was the target of miR-101-3p, and overexpression of CLDN1 can reverse the inhibition of cell migration and invasion by miR-101-3p, What's more, miR-101-3p inhibition and CLDN1 overexpression can reverse the affection of sh-XIST on migration and invasion of PTC cells inhibition. XIST promotes migration and invasion of papillary thyroid cancer cell via directly regulating miR-101-3p/CLDN1 axis, which is a novel mechanistic of XIST in the regulation of PTC.