Reducing Inert Materials for Optimal Cell-Cell and Cell-Matrix Interactions within Microphysiological Systems.

Area of Science:

• Biotechnology
• Tissue Engineering
• Microfluidics

Background:

• Organ-on-a-chip (OoC) devices aim to mimic human tissues in vitro but are limited by inert materials hindering cell interactions.
• Current membranes in OoC devices impede nutrient flow and direct cell-to-cell/cell-matrix contact, potentially causing non-physiological cell responses.

Purpose of the Study:

• To design microfluidic devices that minimize inert materials, thereby maximizing direct cell-matrix and cell-cell interactions.
• To improve the biomimicry and biological relevance of in vitro tissue models.

Main Methods:

• Developed two microfluidic chip designs: one with a 150-micron nylon mesh for cell-cell interaction, and another with a 1-mm macroporous membrane for cell-matrix contact.
• Utilized collagen hydrogel deposition in the second chip design.
• Conducted biological validation including cell migration, cell-cell interaction assays, and epithelial development from cells or spheroids.

Main Results:

• The developed microfluidic devices successfully minimized inert material interfaces.
• Enhanced direct cell-cell and cell-matrix interactions were observed, validating the design's efficacy.
• Biological assays confirmed the devices' capability to support cell migration, interaction, and tissue development.

Conclusions:

• Minimizing inert materials in microfluidic chips is crucial for creating more accurate in vitro models.
• The novel microfluidic designs promote direct cellular interactions, advancing organ-on-a-chip technology.
• These advancements contribute to developing more biomimetic in vitro simulations for drug discovery and research.