Bladder Cancer Cells Exert Pleiotropic Effects on Human Adipose-Derived Stem Cells

Area of Science:

• Biomedical science
• Regenerative medicine
• Cancer research

Background:

• Stem cell-based therapies offer promise for bladder cancer patients, aiding healing and managing side effects like urinary incontinence.
• However, the use of stem cells in cancer patients carries a risk of tumor reactivation due to altered microenvironmental interactions.

Purpose of the Study:

• To investigate the interaction between adipose-derived stem cells (ASCs) and bladder cancer cells using an indirect co-culture model.
• To characterize the effects of soluble mediators secreted by these cells on each other's behavior and the tumor microenvironment.

Main Methods:

• Indirect co-culture of ASCs with various bladder cancer cell lines (5637, HB-CLS-1, HT-1376).
• Analysis of Monocyte Chemoattractant Protein-1 (MCP-1) secretion.
• Assessment of ASC morphology, cell number, adhesion to extracellular matrix (ECM) components, motility, and sheet migration after incubation in conditioned media (CM).

Main Results:

• ASCs increased MCP-1 secretion by bladder cancer cells (2.1- to 8.1-fold).
• Bladder cancer cell-derived factors altered ASC morphology, leading to atypical shapes and enlarged volumes.
• Conditioned media from 5637 and HB-CLS-1 cells significantly reduced ASC numbers (by 47.5% and 45.7%, respectively) and increased their adhesion to ECM, while reducing motility and sheet migration.
• No significant effects were observed when co-cultured with HT-1376 cells.

Conclusions:

• Soluble mediators from ASCs and bladder cancer cells exert opposing effects on non-muscle-invasive urinary bladder cells.
• These complex interactions highlight potential risks and necessitate careful consideration for reconstructive cellular therapies in cancer patients.