Non-swelling hydrogel-based microfluidic chips.

Area of Science:

• Biomaterials Science
• Microfluidics
• Cell Biology

Background:

• Hydrogel microfluidic chips offer biological relevance but suffer from swelling-induced mechanical degradation.
• Conventional polydimethylsiloxane (PDMS) chips lack the biocompatibility and physiological relevance of hydrogels.
• Developing stable, non-swelling hydrogel microfluidic systems is crucial for advanced cell culture models.

Purpose of the Study:

• To introduce and characterize novel non-swelling hydrogel microfluidic chips.
• To evaluate the mechanical stability, biocompatibility, and degradation properties of the new hydrogel system.
• To demonstrate the utility of these chips in a vessel-on-a-chip model for studying endothelial cell function.

Main Methods:

• Fabrication of microfluidic chips using a non-swelling hydrogel via covalent cross-linking of di-acrylated Pluronic F127 (F127-DA).
• Assessment of mechanical strength, channel morphology, autoclavability, and degradation rates.
• Establishment of a vessel-on-a-chip model by culturing human umbilical vein endothelial cells (HUVECs) under perfusion flow.

Main Results:

• The non-swelling hydrogel chips maintained structural integrity and mechanical properties in aqueous solutions at 37 °C.
• Chips were autoclavable and exhibited stable performance over 21 days of incubation.
• HUVECs cultured under physiological shear stress demonstrated enhanced endothelial function compared to static controls.

Conclusions:

• Non-swelling hydrogel microfluidic chips provide a stable and mechanically robust platform for biological applications.
• These novel chips outperform conventional PDMS and existing hydrogel-based systems.
• The developed vessel-on-a-chip model shows promise for studying cell-fluid interactions and endothelial function.