In-depth analysis of switchable glycerol based polymeric coatings for cell sheet engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Chemistry

Background:

• Scaffold-free cell sheet engineering is an advanced tissue engineering method.
• Thermoresponsive substrates facilitate cell sheet harvesting without scaffolds.
• Previous work introduced glycerol-based linear copolymers for cell sheet detachment.

Purpose of the Study:

• To analyze thermoresponsive linear polyglycidyl ethers as cell culture coatings.
• To compare their performance against commercially available poly(N-isopropylacrylamide) (PNIPAM) substrates.
• To investigate the effect of comonomer ratio on copolymer properties.

Main Methods:

• Synthesis of glycidyl methyl ether (GME) and glycidyl ethyl ether (EGE) copolymers.
• Grafting copolymers onto planar surfaces and nanoparticles.
• Surface plasmon resonance (SPR) spectroscopy for protein adsorption analysis.
• Cell culture experiments with NIH 3T3 fibroblasts.

Main Results:

• Glycerol-based polyglycerol coatings exhibit tunable thermoresponsive behavior.
• Coatings can switch between protein-resistant and adsorptive states.
• NIH 3T3 fibroblast adhesion and proliferation were comparable to standard tissue culture polystyrene (TCPS) and superior to PNIPAM.
• Complete cell sheets were detached within minutes at physiological temperatures with high cell viability.

Conclusions:

• Glycerol-based copolymers are effective thermoresponsive coatings for cell culture substrates.
• These copolymers offer a viable alternative to PNIPAM for scaffold-free cell sheet engineering.
• The developed coatings enable efficient and gentle cell sheet harvesting, preserving cell integrity.