Surface-tension driven open microfluidic platform for hanging droplet culture

Area of Science:

• Biotechnology
• Cell Biology
• Tissue Engineering

Background:

• The hanging droplet technique is a long-standing method for 3D tissue culture.
• Existing platforms have limitations in user-friendliness and handling shear-sensitive cells.
• Microscale advancements have improved but not fully addressed these challenges.

Purpose of the Study:

• To develop a novel, spontaneously driven, open hanging droplet culture platform.
• To overcome limitations of current hanging droplet systems, particularly for shear-sensitive and non-adherent cells.
• To enable long-term culture, in-droplet manipulation, and dynamic coculture configurations.

Main Methods:

• A two-interconnected hanging droplet well system was designed.
• A larger well facilitates cell culture, while a smaller well serves as a pipette interface.
• The open well format allows for direct addition or removal of tissue during experiments.

Main Results:

• The two-well system reduces shear stress in the culture well during fluid exchange.
• The platform supports long-term culture, treatment, and characterization without culture disruption.
• Time-dependent coculture with bone tissue scaffolds and suspension cells was successfully performed.

Conclusions:

• The developed platform enhances the capabilities of hanging droplet 3D tissue culture.
• It is suitable for culturing shear-sensitive or non-adherent cells and enables dynamic experimental manipulations.
• This innovation facilitates advanced research in tissue engineering and regenerative medicine.