Cross talk between cancer and immune cells: exploring complex dynamics in a microfluidic environment

Area of Science:

• Immunology
• Cancer Biology
• Microfluidics

Background:

• Microfluidic chips enable complex in vitro models for studying cell interactions.
• Interferon regulatory factor 8 (IRF-8) is crucial for immune responses against cancer.
• IRF-8 deficient mice exhibit increased susceptibility to melanoma growth.

Purpose of the Study:

• To investigate the role of IRF-8 in regulating immune and melanoma cell crosstalk using an on-chip model.
• To elucidate the impact of IRF-8 gene expression on immune cell-tumor cell interactions.
• To assess the utility of microfluidic co-culture systems in studying anti-tumor immunity.

Main Methods:

• Co-culture of B16 melanoma cells and spleen immune cells (wild type and IRF-8 knockout) on a PDMS microfluidic platform.
• Monitoring cell migration, interaction, and invasion using fluorescence microscopy and time-lapse recordings.
• Utilizing IRF-8 knockout mice to model impaired immune surveillance.

Main Results:

• Wild-type immune cells migrated towards and interacted with melanoma cells, forming clusters.
• IRF-8 knockout immune cells exhibited poor interaction with melanoma cells.
• Melanoma cells displayed increased invasiveness and attraction to microchannels in the presence of IRF-8 knockout immune cells.

Conclusions:

• On-chip co-culture systems effectively model in vivo cancer-immune interactions.
• IRF-8 plays a critical role in immune cell immunosurveillance against melanoma.
• Microfluidic models offer valuable insights for developing anti-tumor therapeutic strategies.