Abstract
CircRNAs have been found to participate in the progression of various tumors. In
the present study, we aimed to clarify the role of hsa_circ_0092355 in papillary
thyroid cancer (PTC) cell development. RT-qPCR was used to determine the
expression of hsa_circ_0092355, miR-543, and PDE5A. PTC cell proliferation was
ascertained via a cell colony formation assay and the CCK-8 test. Western
blotting was performed to examine the expression levels of PDE5A and
apoptosis-associated proteins (Bcl-2 and Bax) in PTC cells. A scratch wound
assay was performed to measure the migration of PTC cells. A mouse xenograft
test was performed to assess the effects of hsa_circ_0092355 in vivo. RIP
and dual-luciferase reporter assays confirmed the association between miR-543
and hsa_circ_0092355 or PDE5A. Associations between miR-543, hsa_circ_0092355,
and PDE5A were evaluated using Pearson’s correlation coefficient.
Upregulation of hsa_circ_0092355 was observed in PTC tissues. The
hsa_circ_0092355 knockdown blocked the proliferation and migration of PTC cells
and induced apoptosis. Moreover, hsa_circ_0092355 knockdown blocked PTC
xenograft tumor growth in vivo. The miR-543 inhibitor could reverse the
changes induced by hsa_circ_0092355 knockdown by hsa_circ_0092355 targeting
miR-543. Furthermore, miR-543 suppresses PTC progression by downregulating PDE5A
expression. Our findings suggest that the PTC tumor promoter hsa_circ_0092355
may promote carcinogenesis by controlling the miR-543/PDE5A pathway.
Key words
hsa_circ_0092355 - papillary thyroid cancer - miR-543 - PDE5A