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TARDBP promotes ovarian cancer progression by altering vascular endothelial growth factor splicing

Abstract

Disruptions in alternative splicing regulation play an essential role in ovarian cancer progression. However, the underlying mechanism remains unclear. TAR DNA-binding protein (TARDBP) plays a crucial role in alternative splicing regulation. Herein we found that TARDBP expression was significantly upregulated in OC tissue samples, particularly in cases of metastasis; further, TARDBP expression was markedly upregulated in OC patients with poor prognosis. These findings were validated by extensive tissue microarray data. TARDBP was also found to promote tumorigenesis and metastasis of OC cells in vitro and in vivo. Mechanistically, TARDBP increased the binding of the splicing factor serine/arginine-rich splicing factor 1 (SRSF1) to intron 7 of vascular endothelial growth factor (VEGF), increasing the formation of the proangiogenic VEGF165 isoform and decreasing that of the antiangiogenic VEGF165b isoform. The abnormal alternative splicing event was responsible for the activation of angiogenesis and contributed to the progression of OC. To conclude, TARDBP was found to regulate the alternative splicing of VEGF via SRSF1, induce the formation of VEGF165 but inhibit that of VEGF165b, and promote OC angiogenesis. Hence, TARDBP can serve as an independent prognostic factor and new target for OC cancer therapy.

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Fig. 1: TARDBP expression is significantly up-regulated in OC and associated with worse prognosis.
Fig. 2: TARDBP knockout (KO) inhibits tumorigenesis and metastasis in vitro and in vivo.
Fig. 3: Interaction between TARDBP and SRSF1.
Fig. 4: Down-regulation of SRSF1 expression weakens the enhancement of OC tumorigenesis induced by TARDBP overexpression.
Fig. 5: TARDBP strengthens the binding of SRSF1 to the I7 sequence of VEGF.
Fig. 6: TARDBP and SRSF1 participate in VEGF AS to increase VEGF165 and decrease VEGF165b mRNA and protein levels.
Fig. 7: Effects of TARDBP on HUVECs migration and tube formation ability.

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Acknowledgements

This work was supported by the Doctoral workstation foundation of Guangdong Second Provincial General Hospital (2020072) and the GuangDong Basic and Applied Basic Research Foundation (2021A1515111033).

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YH and QZ were responsible conceived the project, designed the experiments, and YH wrote the manuscript. ZOY, WL conducted the in vitro and in vivo cell experiments; YC provided statistical support, analyzed the IHC data.

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Correspondence to Yutian He or Qiushi Zhang.

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He, Y., OuYang, Z., Liu, W. et al. TARDBP promotes ovarian cancer progression by altering vascular endothelial growth factor splicing. Oncogene 42, 49–61 (2023). https://doi.org/10.1038/s41388-022-02539-9

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