Abstract
Background and purpose
Papillary thyroid carcinoma (PTC) is an endocrine malignancy. Increasing evidence highlights microRNAs (miRNAs) as important participants in PTC. Here, we investigated the role of miR-181a in PTC.
Methods
A microarray-based analysis was performed to identify the differential expression of miR-181a in PTC, which was validated with RT-qPCR. Protein expression of the proliferation-related factor Ki-67 and apoptosis- and migration-related factors in PTC was assessed with immunoblot analysis. A dual-luciferase reporter gene assay was adopted to verify the relationship between miR-181a and lysine demethylase 5C (KDM5C). Chromatin immunoprecipitation (ChIP) was used to detect the level of the H3K4me3 modification on S100 calcium-binding protein A2 (S100A2). Cell viability, apoptosis, and invasion and migration abilities were evaluated by Cell Counting Kit-8 (CCK-8), flow cytometry, and transwell assays, respectively. The in vitro results were verified in in vivo nude mouse models.
Results
miR-181a was highly expressed in PTC tissues and cell lines. Silencing miR-181a repressed the proliferation and migration of PTC cells. KDM5C was identified as the target gene of miR-181a and represses S100A2 expression through histone demethylation to diminish the migration and proliferation of PTC cells. miR-181a depletion suppressed tumor growth.
Conclusion
Collectively, these results suggest that highly expressed miR-181a promotes the proliferation of PTC cells by increasing the expression of the oncogene S100A2. This study contributes to the advancement of miR-181a-targeted therapeutics.
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Funding
This study was supported by the National Natural Science Foundation of China (Grant No. 81402213) and Characteristic Innovation Projects of General Colleges and Universities in Guangdong Province (Grant No. 2019KTSCX009) award to Yingxue Wang, the National Natural Science Foundation of China (Grant No. 81874220), and Guangdong Basic and Applied Basic Research Foundation (Grant No. 2020A151501030) award to Lei Zhao.
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YW and LZ designed the study. HY, AC and JL collated the data, carried out data analyses and produced the initial draft of the manuscript. YY and JL contributed to drafting the manuscript. All authors have read and approved the final submitted manuscript.
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The experimental design was approved by the Institutional Research Ethics Committee of Sun Yat-sen University Cancer Center (Guangzhou, China) and conducted in compliance with the Declaration of Helsinki. The experiments involving animals were performed in line with the Guide for the Care and Use of Laboratory Animals to minimize the suffering and discomfort of experimental animals.
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Wang, Y., Ye, H., Yang, Y. et al. microRNA-181a promotes the oncogene S100A2 and enhances papillary thyroid carcinoma growth by mediating the expression of histone demethylase KDM5C. J Endocrinol Invest 45, 17–28 (2022). https://doi.org/10.1007/s40618-021-01606-4
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DOI: https://doi.org/10.1007/s40618-021-01606-4