Guiding cell migration in 3D with high-resolution photografting

Area of Science:

• Biomaterials Engineering
• Cell Biology
• Tissue Engineering

Background:

• Multi-photon lithography (MPL) offers precise control over the cellular microenvironment within hydrogel matrices.
• Existing methods require advanced techniques to manipulate cellular behavior and tissue formation.
• Controlling cell alignment, migration, and vascularization is crucial for regenerative medicine.

Purpose of the Study:

• To present a novel multi-photon photografting method using 4,4'-diazido-2,2'-stilbenedisulfonic acid (DSSA).
• To demonstrate the method's capability in inducing cell alignment, directional migration, and endothelial sprouting.
• To establish a biocompatible and efficient technique for altering cell microenvironments in gelatin hydrogels.

Main Methods:

• Utilized multi-photon photografting of DSSA on a gelatin-based hydrogel matrix.
• Fabricated high-resolution patterns to guide cellular responses.
• Co-cultured human adipose-derived stem cells (hASCs) and human umbilical vein endothelial cells (HUVECs) to assess migration and sprouting.

Main Results:

• Demonstrated preferential orientation of hASCs in response to DSSA photografted patterns.
• Observed directional migration of hASCs into modified hydrogel regions.
• Showcased hASC-dependent endothelial sprouting and controlled sprout directionality.

Conclusions:

• MPL-induced DSSA-photografting is a versatile, biocompatible, and efficient method for precise microenvironment control.
• This technique successfully guides cell alignment, migration, and vascular network formation.
• The findings highlight the potential of photografting for advanced tissue engineering and regenerative medicine strategies.