Engineering the extracellular environment: Strategies for building 2D and 3D cellular structures

Area of Science:

• Biomaterials Science
• Cell Biology
• Tissue Engineering

Background:

• Cell fate decisions (proliferation, differentiation, apoptosis, migration) are governed by extracellular signals and cell interactions.
• The extracellular environment plays a critical role in directing cellular behavior and tissue organization.

Purpose of the Study:

• To review engineering approaches for manipulating the extracellular environment to build cellular structures.
• To highlight methods for controlling cell adhesion, creating 2D cell sheets, and patterning 3D environments for tissue engineering.

Main Methods:

• Surface modification using self-assembled monolayers (SAMs) and polyelectrolyte multilayers (PEMs) to control wettability and stiffness.
• Temporal and spatial control of adhesion ligands.
• Construction of 2D cell sheets using temperature-sensitive polymers or electrochemical dissolution.
• 3D cell patterning and functionalization with biologic motifs.

Main Results:

• Engineering the extracellular environment enables precise control over cell fate and tissue assembly.
• Techniques for creating 2D cell sheets have shown promise in clinical applications.
• 3D patterning and functionalization methods advance the goal of engineering complex tissues and organs.

Conclusions:

• Engineering the extracellular environment is a powerful strategy for building complex cellular structures and tissues.
• Advances in surface modification, cell sheet construction, and 3D patterning are crucial for regenerative medicine.
• This field holds significant potential for developing multicellular tissues and organs for therapeutic use.