Abstract
Purpose
Studies have shown that circRNA is involved in the occurrence and development of human cancers. However, it remains unclear that the contribution of circRNA in thyroid carcinoma and its role in the process of tumorigenesis.
Methods
The expression profile of circRNA-miRNA-mRNA in thyroid carcinoma was detected by RNA sequencing and verified by qRT-PCR. The characteristics of circGLIS3 were verified by RNase R and actinomycin assays, subcellular fractionation, and fluorescence in situ hybridization. The functions of circGLIS3 and AIF1L were detected by wound healing, transwell, 3D culture and Western blot. RNA Immunoprecipitation (RIP), RNA pulldown and dual-luciferase reporter assays were used to verify the target genes of circGLIS3 and downstream miRNAs. Functional rescue experiments were performed by transfecting miRNA mimics or siRNA of target genes. Finally, metastatic mouse models were used to investigate circGLIS3 function in vivo.
Results
In this study, we discovered a novel circRNA (has_circ_0007368, named as circGLIS3) by RNA sequencing. CircGLIS3 was down-regulated in thyroid carcinoma tissues and cells line, and was negatively associated with malignant clinical features of thyroid carcinoma. Functional studies found that circGLIS3 could inhibit the migration and invasion of thyroid carcinoma cells, and was related to the EMT process. Mechanistically, circGLIS3 can upregulate the expression of the AIF1L gene by acting as a miR-146b-3p sponge to inhibit the progression of thyroid carcinoma.
Conclusion
Our study identified circGLIS3 as a novel tumor suppressor in thyroid cancer, indicating the potential of circGLIS3 as a promising diagnostic and prognostic marker for thyroid cancer.
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Data Availability
The data in the present study is available from the corresponding author upon reasonable request.
Abbreviations
- DTC:
-
Differentiated thyroid carcinoma
- circRNAs:
-
Circular RNAs
- EMT:
-
Epithelial-mesenchymal transition
- RBPs:
-
RNA binding proteins
- PTC:
-
Papillary thyroid carcinoma
- ceRNA:
-
Competing endogenous RNA
- ATC:
-
Anaplastic thyroid carcinoma
- FBS:
-
Fetal bovine serum
- NC:
-
Negative control
- FISH:
-
Fluorescence in situ hybridization
- 3D:
-
Three-dimensional
- RIP:
-
RNA immunoprecipitation
- SD:
-
Standard deviation
- gDNA:
-
Genomic DNA
- AIF1L:
-
Allograft inflammatory factor 1 like
- IBA2:
-
Ionized calcium-binding adapter molecule 2
- AIF1:
-
Allograft inflammatory factor 1
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Funding
This work was funded by the National Natural Science Foundation of China (No.81772850 and No.82273300) and Medical Science and Technology Research Fund of Guangdong Province (A2021127).
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S.C. and Y.Y. performed the experiments and drafted the manuscript; H.H. and W.H. provided experimental support; W.L. collected the clinical specimens; S.H., R.L. and Y.L. commented on the study; S.Y. and H.X. designed and supervised the study and revised the manuscript. All authors reviewed the manuscript.
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The study, which involved human samples, obtained approval from the Institutional Research Ethics Committee of Sun Yat-sen University. Animal Experiment were carried out in accordance with the National Research Council’s Guide for the Care and Use of Laboratory Animals and were conducted with the approval of the Ethics Committee of Sun Yat-sen University.
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Cao, S., Yin, Y., Hu, H. et al. CircGLIS3 inhibits thyroid cancer invasion and metastasis through miR-146b-3p/AIF1L axis. Cell Oncol. 46, 1777–1789 (2023). https://doi.org/10.1007/s13402-023-00845-2
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DOI: https://doi.org/10.1007/s13402-023-00845-2