Down-regulation of miR-377 contributes to cisplatin resistance by targeting XIAP in osteosarcoma

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Chemoresistance presents a significant challenge in effective cancer treatment.
• MicroRNAs (miRNAs) are increasingly recognized for their crucial roles in mediating drug resistance.
• Osteosarcoma (OS) treatment outcomes are often limited by acquired chemoresistance.

Purpose of the Study:

• To investigate the role of microRNA-377 (miR-377) in cisplatin resistance in osteosarcoma.
• To elucidate the underlying molecular mechanisms by which miR-377 influences chemoresistance in OS.

Main Methods:

• Real-time polymerase chain reaction (PCR) to quantify miR-377 expression in patient tissues and cell lines.
• Cell Counting Kit (CCK) 8, flow cytometry, and Western blot assays to assess cellular response and apoptosis.
• Luciferase assays to confirm direct targeting of XIAP mRNA by miR-377.

Main Results:

• Down-regulation of miR-377 was observed in chemoresistant osteosarcoma tissues and cell lines.
• Overexpression of miR-377 restored sensitivity to cisplatin, inducing caspase-3 dependent apoptosis.
• MiR-377 directly targets the 3' untranslated region (UTR) of X-linked inhibitor of apoptosis protein (XIAP) mRNA, repressing its expression.

Conclusions:

• The miR-377/XIAP signaling axis plays a critical role in regulating cisplatin resistance in osteosarcoma.
• MiR-377 demonstrates potential as a therapeutic agent to overcome chemoresistance in OS.
• Targeting the miR-377/XIAP pathway could offer novel strategies for improving osteosarcoma treatment efficacy.