miR-548e Sponged by ZFAS1 Regulates Metastasis and Cisplatin Resistance of OC by Targeting CXCR4 and let-7a/BCL-XL/S...

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Ovarian cancer (OC) presents a significant clinical challenge due to its aggressive nature, characterized by rapid metastasis and resistance to chemotherapy.
• Understanding the molecular mechanisms underlying OC progression and chemoresistance is crucial for developing effective therapeutic strategies.

Purpose of the Study:

• To elucidate the roles of ZFAS1 and microRNA-548e (miR-548e) in regulating ovarian cancer cell proliferation, metastasis, and cisplatin resistance.
• To investigate the upstream and downstream molecular pathways involving ZFAS1, miR-548e, CXCR4, let-7a, and BCL-XL/S in ovarian cancer.

Main Methods:

• Quantitative real-time PCR and Western blotting to assess gene and protein expression levels.
• Cell proliferation, migration, and invasion assays to evaluate cellular behavior.
• In vivo studies using nude mice to assess the impact of ZFAS1 knockdown and miRNA overexpression on metastasis and chemoresistance.

Main Results:

• ZFAS1 was found to be highly expressed in OC, promoting cell proliferation, migration, invasion, and cisplatin resistance by directly suppressing miR-548e.
• miR-548e was shown to repress CXCR4 expression, while elevated CXCR4 expression promoted OC progression and cisplatin resistance.
• ZFAS1 and CXCR4 overexpression induced cisplatin resistance by suppressing let-7a and upregulating BCL-XL/S expression.

Conclusions:

• ZFAS1 interacts with miR-548e to upregulate CXCR4, thereby promoting ovarian cancer cell proliferation and metastasis.
• This pathway also contributes to cisplatin resistance by downregulating let-7a and upregulating BCL-XL/S.
• Targeting the ZFAS1/miR-548e/CXCR4 axis offers a potential therapeutic strategy for overcoming ovarian cancer progression and chemoresistance.