Hydrogel-based microfluidic device with multiplexed 3D in vitro cell culture.

Area of Science:

• Biomedical Engineering
• Cell Biology
• Neuro-oncology

Background:

• Microfluidic devices offer advanced cell culture platforms by integrating extracellular matrix, cells, and perfusion.
• Current platforms often lack the complexity to fully replicate the in vivo tumor microenvironment.

Purpose of the Study:

• To develop and validate a novel hydrogel-based microfluidic cell culture platform for glioblastoma research.
• To create a system that biomimetically perfuses encapsulated cells and generates controlled drug concentration gradients.
• To demonstrate the platform's utility in drug screening assays for glioblastoma.

Main Methods:

• Development of a multilayer polydimethyl siloxane (PDMS) microfluidic device incorporating polyethylene glycol (PEG) hydrogels.
• Encapsulation of U87 glioblastoma cells within PEG hydrogels and loading into membrane-capped wells.
• Integration of a microfluidic concentration gradient generator (MCGG) with tailored channel widths for fractional serial dilution.
• Perfusion of cell culture chambers and measurement of drug diffusion (temozolomide, carmustine) using dose-response curves.

Main Results:

• Efficient and reproducible loading of hydrogels with even cell distribution and >90% viability for up to 4 days.
• Successful generation of fractional serial drug dilutions (1, 1/2, 1/4, 0) via tailored MCGG input channel widths.
• Demonstration of drug diffusion and generation of dose-response curves for temozolomide and carmustine in U87 cells.

Conclusions:

• The developed hydrogel-based microfluidic platform effectively mimics the glioblastoma microenvironment in vitro.
• The system is suitable for high-throughput drug screening and evaluating drug efficacy against glioblastoma.
• This technology advances the development of more predictive preclinical models for cancer research.