Detecting cell-secreted growth factors in microfluidic devices using bead-based biosensors

Area of Science:

• Biomedical Engineering
• Cell Biology
• Analytical Chemistry

Background:

• Microfluidic systems offer advantages over traditional cell cultures, including reduced reagent use and improved cell physiology.
• Limited tools exist for detecting cell-secreted molecules within microfluidic devices, hindering their application in biological research.
• Primary hepatocytes secrete key growth factors like HGF and TGF-β1, crucial for liver function and disease research.

Purpose of the Study:

• To develop and validate an integrated microfluidic system coupled with a fluorescent microbead-based assay.
• To enable the detection of hepatocyte growth factor (HGF) and transforming growth factor (TGF)-β1 secreted by primary hepatocytes.
• To provide a versatile platform for analyzing various cell-secreted factors in microfluidic environments.

Main Methods:

• Design of a microfluidic device with a hydrogel barrier to separate cell culture from sensing chambers.
• Utilizing fluorescent microbead-based sensors functionalized with specific antibodies for analyte detection.
• Quantification of HGF and TGF-β1 diffusion from the cell culture chamber through the hydrogel barrier to the sensing channels.

Main Results:

• Successful integration of a microfluidic culture system with a fluorescent microbead assay.
• Demonstrated detection of HGF and TGF-β1 secreted by primary hepatocytes within the microfluidic device.
• The hydrogel barrier effectively separated cell culture from sensing areas, allowing analyte diffusion.

Conclusions:

• The developed microfluidic system provides a novel and effective method for detecting specific cell-secreted factors.
• The platform's modular design, utilizing antibody-specific microbeads, allows for broad applicability to various cell types and secreted molecules.
• This technology advances the capabilities for real-time monitoring and analysis of cellular signaling in microfluidic settings.