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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering

Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering

Published on: March 1, 2016

Thermosensitive "Smart" Surfaces for Biorecognition Based Cell Adhesion and Controlled Detachment.

Silvia Brunato¹, Francesca Mastrotto¹, Federica Bellato¹

¹Department of Pharmaceutical and Pharmacological Sciences, University of Padova, via F. Marzolo 5, Padova, 35131, Italy.

Macromolecular Bioscience

|November 4, 2020

Summary

This study demonstrates controlled attachment and detachment of MCF-7 cancer cells using a thermoresponsive polymer coating. The surface facilitates cell adhesion below its critical temperature and detachment above it by controlling peptide accessibility.

Keywords:

cell capture and release controlled cell harvest thermoresponsive polymers “smart” surfaces

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Last Updated: Dec 2, 2025

Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering

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Area of Science:

Biomaterials Science
Cell Biology
Surface Chemistry

Background:

Cell adhesion is crucial for biological processes and disease.
Controlling cell attachment and detachment on surfaces is important for applications like tissue engineering and diagnostics.
Integrin-mediated cell adhesion plays a key role in cancer cell behavior.

Purpose of the Study:

To develop a biorecognition-based system for controlled attachment and detachment of MCF-7 cancer cells.
To investigate the use of a thermoresponsive polymer coating functionalized with GRGDS peptides for cell surface interactions.
To modulate cell integrin/GRGDS binding for controlled cell capture and release.

Main Methods:

Coating glass surfaces with a thermoresponsive copolymer [poly(N-isopropylacrylamide-co-acrylamide), p(NIPAm-co-Am)] end-capped with GRGDS peptide and PEG.
Utilizing the lower critical solution temperature (LCST) of the copolymer to control polymer conformation and peptide accessibility.
Employing spectrophotometric, surface, and microscopy assays to characterize the coated substrates and cell attachment.

Main Results:

The polymer coating enabled MCF-7 cancer cell attachment below the LCST (38 °C) by exposing GRGDS peptides to cell integrins.
Above the LCST, the polymer collapsed, shielding the GRGDS peptides and causing cell detachment.
Competition studies confirmed that cell attachment was mediated by integrin/GRGDS recognition.

Conclusions:

A thermoresponsive polymer system can effectively control MCF-7 cancer cell attachment and detachment.
The system leverages changes in polymer conformation to regulate peptide-cell interactions.
This approach offers potential for developing smart biomaterials for controlled cell manipulation.