Background: Drug resistance is the main factor contributing to cancer recurrence and poor prognosis. Exploration of drug resistance-related mechanisms and effective therapeutic targets are the aim of molecular targeted therapy. In our study, the role of long non-coding RNA (lncRNA) AFAP1-AS1 in gemcitabine resistance and related mechanisms were explored in cervical cancer cells.
Methods: Gemcitabine-resistant cervical cancer cell lines HT-3-Gem and SW756-Gem were constructed using the gemcitabine concentration gradient method. The overall survival rates and recurrence-free survival rates were evaluated by Kaplan-Meier analysis. The interaction was verified through a Dual-luciferase reporter gene assay and a Biotinylated RNA pull-down assay. Cell proliferation ability was assessed through methyl-thiazolyl-tetrazolium (MTT), soft agar, and colony formation experiments. Cell cycle and apoptosis were detected by flow cytometry.
Results: Up-regulation of AFAP1-AS1 in cervical cancer predicted a poor prognosis. Besides, patients in the gemcitabine-resistance group had higher levels of AFAP1-AS1 than the gemcitabine-sensitive group. AFAP1-AS1 promoted tumor growth and induced gemcitabine tolerance of cervical cancer cells. In addition, AFAP1-AS1 mediated epidermal growth factor receptor (EGFR) expression by serving as a molecular sponge for microRNA-7a-5p (miR-7-5p). This present study also proved that the knockdown of EGFR or overexpression of miR-7a-5p abolished the accelerative role of AFAP1-AS1 overexpression in cancer progression and gemcitabine tolerance.
Conclusions: In general, the AFAP1-AS1/miR-7-5p/EGFR axis was tightly related to the progression and gemcitabine tolerance of cervical cancer, providing potential targets for the management of cervical cancer.
Keywords: Cervical cancer; Epidermal growth factor receptor (EGFR); Gemcitabine-resistance; Long non-coding RNA (lncRNA) AFAP1-AS1; miR-7-5p.
© 2024 The Authors.