Abstract
Thrombospondin 1 (TSP1) is known for its cell-specific functions in cancer progression, such as proliferation and migration. It contains 22 exons that may potentially produce several different transcripts. Here, we identified TSP1V as a novel TSP1-splicing variant produced by intron retention (IR) in human thyroid cancer cells and tissues. We observed that TSP1V functionally inhibited tumorigenesis contrary to TSP1 wild-type, as identified in vivo and in vitro. These activities of TSP1V are caused by inhibiting phospho-Smad and phospho-focal adhesion kinase. Reverse transcription polymerase chain reaction and minigene experiments revealed that some phytochemicals/non-steroidal anti-inflammatory drugs enhanced IR. We further found that RNA-binding motif protein 5 (RBM5) suppressed IR induced by sulindac sulfide treatment. Additionally, sulindac sulfide reduced phospho-RBM5 levels in a time-dependent manner. Furthermore, trans-chalcone demethylated TSP1V, thereby preventing methyl-CpG-binding protein 2 binding to TSP1V gene. In addition, TSP1V levels were significantly lower in patients with differentiated thyroid carcinoma than in those with benign thyroid nodule, indicating its potential application as a diagnostic biomarker in tumor progression.
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Acknowledgements
We gratefully acknowledge the Korea Mouse Phenotyping Center (KMPC) for their technical support, especially Jongdoo Kim, PhD.
Funding
This work was supported by the Research Institute for Veterinary Science and BK21 PLUS Program for Creative Veterinary Science Research Center, Seoul National University, and by a National Research Foundation of Korea (NRF) grant funded by the Korean government (2020R1A2B2002923) to SJB. This work was also supported by a clinical research grant (NCC2211670-1) provided by the National Cancer Center to JSR, CHR, and SJB.
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YH, JR, and SJB. conceived of the study and designed the experiments. YH, IK, HM, JL, and PL. performed the experiments and collected data. CHR, YSJ, JS, YK, JR, and SJB. interpreted the results. YH, JR, and SJB. wrote the original and revised versions of the manuscript. All authors read and approved the final manuscript.
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The study was approved by the Institutional Review Board of the National Cancer Center (NCC-2014-0003), mouse experiments were approved by the Institutional Animal Care and Use Committee of Seoul National University (SNU-210511-2-1), and all experiments were conducted in accordance with the relevant guidelines and regulations.
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Hong, Y., Kim, I., Moon, H. et al. Novel thrombospondin-1 transcript exhibits distinctive expression and activity in thyroid tumorigenesis. Oncogene 42, 1832–1842 (2023). https://doi.org/10.1038/s41388-023-02692-9
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DOI: https://doi.org/10.1038/s41388-023-02692-9