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CircTP53 promotes the proliferation of thyroid cancer via targeting miR-1233-3p/MDM2 axis

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Abstract

Background

Follicular cells give rise to thyroid cancer. Worldwide thyroid cancer incidence continues to rise in recent decades but the mortality rate remains at a stable level. The discovery of novel molecular mechanisms in the pathogenesis of thyroid cancer will promote new diagnostic or therapeutic strategies. Circular RNA (circRNA) is a type of noncoding RNA which is characterized by the covalently closed loop and non-protein coding capacity. The abnormal expression of circRNAs is an important part during the pathogenesis and development of thyroid cancer. CircTP53 is a novel circRNA, and we aimed to investigate its function in the pathogenesis of thyroid cancer and to further demonstrate the underlying molecular mechanism.

Methods

The levels of circTP53, miR-1233-3p, and other relative mRNA were analyzed by qRT-PCR. Protein levels were shown by Western blot. RNA-pulldown assay and luciferase assay were employed to examine the interaction between circTP53 and miR-1233-3p. Cell proliferation was analyzed by the MTT assay.

Results

CircTP53 was a circRNA highly expressed in thyroid cancer tissues. CircTP53 promoted cell proliferation and cell viability of TPC-1 cells. Knockdown of circTP53 inhibited the expression of Mouse double minute 2 (MDM2) and increased the protein level of p53. CircTP53 acted as a target of miR-1233-3p to increase MDM2 expression. p53 expression in thyroid cancer tissue exhibited a negative correlation with circTP53 expression.

Conclusion

In thyroid cancer, overexpressed circTP53 decreased the protein level of p53 via targeting miR-1233-3p/MDM2 axis and promoted cancer cell proliferation.

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Authors and Affiliations

  1. The Second Hospital of Hebei Medical University, No. 215 Heping West Road, Shijiazhuang, 050000, Hebei, China

    W. Ma, P. Zhao, L. Zang, K. Zhang, H. Liao & Z. Hu

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  1. W. Ma
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  2. P. Zhao
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  3. L. Zang
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Correspondence to Z. Hu.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. This research was authorized by the ethics committee of The Second Hospital of Hebei Medical University.

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Ma, W., Zhao, P., Zang, L. et al. CircTP53 promotes the proliferation of thyroid cancer via targeting miR-1233-3p/MDM2 axis. J Endocrinol Invest 44, 353–362 (2021). https://doi.org/10.1007/s40618-020-01317-2

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  • DOI: https://doi.org/10.1007/s40618-020-01317-2

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