Soft landing of cell-sized vesicles on solid surfaces for robust vehicle capture/release

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Biotechnology

Background:

• Fragile lipid giant unilamellar vesicles (GUVs) are prone to rupture upon surface contact.
• Existing methods struggle with the controlled capture and release of delicate GUVs.

Purpose of the Study:

• To develop a soft landing model for deformable GUVs on solid surfaces.
• To achieve robust GUV capture without rupture using a biomimetic approach.
• To enable stimuli-responsive, reversible GUV capture and release.

Main Methods:

• Fabrication of a two-layer substrate with a lysozyme layer and an upper lipid membrane.
• Sedimentation of anionic GUVs onto the modified substrate.
• Analysis of GUV-surface interactions and capture mechanisms.

Main Results:

• Insertion of a lipid membrane cushion prevented GUV rupture by attenuating coulombic forces.
• Achieved robust GUV capture on the substrate without vesicle destruction.
• Demonstrated fully reversible, stimuli-responsive GUV capture and release via non-covalent bonding.

Conclusions:

• The developed biomimetic surface provides a soft cushion for landing fragile GUVs.
• This technique overcomes previous limitations in handling delicate GUVs.
• The controllable capture/release mechanism has significant potential for cell-based biotechnologies.