Related Experiment Video
Updated: Sep 10, 2025
07:02
Stiffness Measurement of Soft Silicone Substrates for Mechanobiology Studies Using a Widefield Fluorescence Microscope
Published on: July 3, 2018
7.0K
Size and softness synergy in cellular microgel uptake: a force spectroscopy study
Andrey Babenyshev1, Victoria K Switacz2, Marc Spehr2
1Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany. wrichtering@pc.rwth-aachen.de.
Nanoscale
|August 26, 2025
Summary
Researchers developed a new method to predict how Poly(N-isopropylacrylamide) (PNIPAM) microgels interact with cells. This technique uses atomic force microscopy to assess microgel structure and stiffness, aiding in the selection of suitable microgels for biomedical applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Cell Biology
Background:
- Poly(N-isopropylacrylamide) (PNIPAM) microgels show potential in biomedical fields.
- Understanding microgel-cell interactions is crucial for their application.
- Cross-linker content and size affect cellular uptake.
Purpose of the Study:
- To investigate the internal structure of PNIPAM microgels.
- To correlate microgel deformation and stiffness with cellular uptake.
- To develop a predictive characterization method for microgel-cell interactions.
Main Methods:
- Atomic force microscopy (AFM) for structural analysis.
- Force spectroscopy to measure microgel stiffness.
- Investigated conventional and ultralow cross-linked (ULC) PNIPAM microgels.
- Tested on HEK293T cells.
Main Results:
- Developed a method linking microgel deformation on a substrate to stiffness.
- This method accurately predicts cellular uptake ability.
- Findings validated for micron-sized ULC PNIPAM microgels.
Conclusions:
- The developed characterization method predicts cellular internalization of various microgels.
- This approach can streamline the screening of microgel properties early in synthesis.
- Facilitates the development of microgels for biomedical applications.
