Automated Microfluidic System for Dynamic Stimulation and Tracking of Single Cells

Area of Science:

• Cell Biology
• Microfluidics
• Stem Cell Research

Background:

• Cell fate decisions are influenced by dynamic environmental signals.
• Studying nonadherent cells (e.g., hematopoietic stem and progenitor cells) in vitro is challenging due to media flow causing displacement and disturbance.
• Long-term observation of individual nonadherent cells under changing conditions is crucial for understanding cell fate.

Purpose of the Study:

• To develop a programmable microfluidic system for the long-term culture and time-lapse imaging of nonadherent cells.
• To enable dynamic changes in cell culture conditions without losing track of individual cells.
• To facilitate the analysis of dynamic signaling inputs controlling cell fate decisions.

Main Methods:

• A programmable microfluidic system with valve-controlled design for targeted cell seeding.
• Independent culture chambers (up to 48) allowing for long-term cell colony expansion.
• Diffusion-based media exchange to minimize cell displacement and shear stress.

Main Results:

• Successful long-term culture and tracking of primary hematopoietic stem and progenitor cells.
• Successful long-term culture and tracking of murine embryonic stem cells.
• Demonstrated ability to maintain nonadherent cells in dynamically changing environments without loss of track.

Conclusions:

• The developed microfluidic system effectively supports long-term culture and tracking of nonadherent cells under dynamic conditions.
• This technology overcomes previous limitations in studying nonadherent cell behavior in response to environmental changes.
• The system holds significant potential for investigating signaling pathways that govern cell fate choices.