Expression of concern: Overexpression of long intergenic noncoding RNA LINC00312 inhibits the invasion and migration of thyroid cancer cells by down-regulating microRNA-197-3p

The study evaluated the ability of long intergenic noncoding RNA LINC00312 (LINC00312) to influence the proliferation, invasion, and migration of thyroid cancer (TC) cells by regulating miRNA-197-3p. TC tissues and adjacent normal tissues were collected from 211 TC patients. K1 (papillary TC), SW579 (squamous TC), and 8505C (anaplastic TC) cell lines were assigned into a blank, negative control (NC), LINC00312 overexpression, miR-197-3p inhibitors, and LINC00312 overexpression + miR-197-3p mimics group. The expression of LINC00312, miR-197-3p, and p120 were measured using quantitative real-time PCR (qRT-PCR) and Western blotting. Cell proliferation was assessed via CCK8 assay, cell invasion through the scratch test, and cell migration via Transwell assay. In comparison with adjacent normal tissues, the expression of LINC00312 is down-regulated and the expression of miR-197-3p is up-regulated in TC tissues. The dual luciferase reporter gene assay confirmed that P120 is a target of miR-197-3p. The expression of LINC00312 and p120 was higher in the LINC00312 overexpression group than in the blank and NV groups. However, the expression of miR-197-3p was lower in the LINC00312 overexpression group than in the blank and NC groups. The miR-197-3p inhibitors group had a higher expression of miR-197-3p, but a lower expression of p120 than the blank and NC groups. The LINC00312 overexpression and miR-197-3p inhibitor groups had reduced cell proliferation, invasion and migration than the blank and NC groups. These results indicate that a LINC00312 overexpression inhibits the proliferation, invasion, and migration of TC cells and that this can be achieved by down-regulating miR-197-3p.

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Suppression of MIR31HG Affects the Functional Properties of Thyroid Cancer Cells Depending on miR-761/MAPK1 Axis

10.21203/rs.3.rs-828977/v1 ◽

2021 ◽

Author(s):

Shuwang Peng ◽

Luyang Chen ◽

Zhengtai Yuan ◽

Shanshan Duan

Keyword(s):

Thyroid Cancer ◽

Cancer Cells ◽

Mitogen Activated Protein Kinase ◽

Luciferase Reporter ◽

Invasion And Migration ◽

And Migration ◽

Cancer Suppression ◽

Thyroid Cancer Cells

Abstract Background: Long non-coding RNAs (lncRNAs) possess pivotal roles in human cancers, including thyroid cancer. In this study, we sought to elucidate the precise action of MIR31HG in the functional behaviors of thyroid cancer cells.Methods: MIR31HG, microRNA (miR)-761 and mitogen-activated protein kinase 1 (MAPK1) were quantified by quantitative real-time PCR (qRT-PCR) or immunoblotting analysis. Cell viability, proliferation, apoptosis, invasion, and migration abilities were evaluated by MTS, 5-Ethynyl-2’-Deoxyuridine (EdU), flow cytometry, transwell and wound-healing assays, respectively. Dual-luciferase reporter assays were performed to validate the relationship between miR-761 and MIR31HG or MAPK1. Mouse xenografts were formed to assess the effect of MIR31HG on tumor growth.Results: MIR31HG expression was at high levels in thyroid cancer. Suppression of MIR31HG impeded cell proliferation, invasion, and migration, as well as promoted cell apoptosis in vitro, and diminished the growth of xenograft tumors in vivo. Mechanistically, MIR31HG targeted and regulated miR-761. Moreover, the effects of MIR31HG suppression was partly dependent on increased abundance of miR-761. MAPK1 was established as a direct and functional target of miR-761. Furthermore, MIR31HG involved the modulation of MAPK1 expression through competitively binding to miR-761 by the shared binding sequence.Conclusion: Our findings demonstrate the workings of an undescribed regulatory network, in which MIR31HG targets miR-761 to regulate MAPK1 expression, leading to the alteration of the functional behaviors of thyroid cancer cells.

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