Abstract
Background: Despite the recent research implicating E2F8 (E2F Transcription Factor 8) in cancer, the role of E2F8 in the progression of ovarian cancer has remained unclear. Hence, we explored the bio-functional effects of E2F8 knockdown on ovarian cancer cell lines in vitro and in vivo. Methods: The expression of E2F8 was compared between ovarian cancer and noncancer tissues, and its association with the progression-free survival of ovarian cancer patients was analyzed. To demonstrate the function of E2F8 in cell proliferation, migration, and invasion, we employed RNA interference to suppress E2F8 expression in ovarian cancer cell lines. Finally, the effect of E2F8 knockdown was investigated in a xenograft mouse model of ovarian cancer. Results: Ovarian cancer tissue exhibited significantly higher E2F8 expression compared to that of normal ovarian tissue. Clinical data showed that E2F8 was a significant predictor of progression-free survival. Moreover, the prognosis of the ovarian cancer patients with high E2F8 expression was poorer than that of the patients with low E2F8 expression. In vitro experiments using E2F8-knockdown ovarian cancer cell lines demonstrated that E2F8 knockdown inhibited cell proliferation, migration, and tumor invasion. Additionally, E2F8 was a potent inducer and modulator of the expression of epithelial–mesenchymal transition and Notch signaling pathway-related markers. We confirmed the function of E2F8 in vivo, signifying that E2F8 knockdown was significantly correlated with reduced tumor size and weight. Conclusions: Our findings indicate that E2F8 is highly correlated with ovarian cancer progression. Hence, E2F8 can be utilized as a prognostic marker and therapeutic target against ovarian malignancy.
Highlights
Ovarian cancer is the leading cause of gynecologic cancer-related mortality, owing to its aggressive metastasis, recurrence, and drug resistance
These results indicate that the dysregulation of the Epithelial–mesenchymal transition (EMT)-related genes may explain the involvement of E2F transcription factor 8 (E2F8) in ovarian cancer cell migration and invasion
We investigated the biofunctional role of E2F8 in epithelial ovarian cancer progression, and our results established a vital role for E2F8 as a promoter of ovarian cancer cell proliferation, migration, and invasiveness
Summary
Ovarian cancer is the leading cause of gynecologic cancer-related mortality, owing to its aggressive metastasis, recurrence, and drug resistance. Our previous research showed that E2F8 was involved in invasion and metastasis by EMT in cervical cancer [20]. These results showed that E2F8 is closely associated with EMT, but the detailed mechanism of EMT regulation by E2F8 in ovarian cancer is unknown. Despite the recent research implicating E2F8 (E2F Transcription Factor 8) in cancer, the role of E2F8 in the progression of ovarian cancer has remained unclear. We explored the bio-functional effects of E2F8 knockdown on ovarian cancer cell lines in vitro and in vivo. To demonstrate the function of E2F8 in cell proliferation, migration, and invasion, we employed RNA interference to suppress E2F8 expression in ovarian cancer cell lines. E2F8 can be utilized as a prognostic marker and therapeutic target against ovarian malignancy
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