Cancer-Associated Fibroblast-Derived miR-146a-5p Generates a Niche That Promotes Bladder Cancer Stemness and...

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• Cancer stem-like cells (CSCs) drive chemoresistance and recurrence in urothelial bladder cancer (UBC).
• The tumor microenvironment (TME) significantly influences CSC maintenance and function.
• Cancer-associated fibroblasts (CAFs) are key components of the TME involved in tumor progression.

Purpose of the Study:

• Investigate the role of CAFs in generating and supporting UBC CSCs.
• Elucidate the mechanisms by which CAFs influence UBC stemness and chemoresistance.
• Identify potential biomarkers for UBC recurrence.

Main Methods:

• Overexpression of miR-146a-5p in CAFs.
• Analysis of CAF-UBC cell interactions and cancer stemness markers.
• Mechanistic studies involving gene expression analysis (SVEP1, ARID1A, PRKAA2, SOCS1, STAT3, mTOR signaling).
• Quantification of exosomal miR-146a-5p in patient serum.

Main Results:

• Overexpression of miR-146a-5p in CAFs enhanced UBC stemness and chemoresistance.
• CAF-derived miR-146a-5p upregulates SVEP1 in CAFs via YY1 recruitment.
• CAF-secreted miR-146a-5p targets ARID1A and PRKAA2 in UBC cells, promoting stemness and chemoresistance.
• Elevated exosomal miR-146a-5p in UBC patient serum correlates with tumor stage and relapse risk.

Conclusions:

• CAF-derived miR-146a-5p promotes stemness and chemoresistance in urothelial bladder cancer.
• Exosomal miR-146a-5p serves as a potential biomarker for UBC recurrence.
• Targeting exosomal miR-146a-5p represents a potential therapeutic strategy for UBC.