What Caging Force Cells Feel in 3D Hydrogels: A Rheological Perspective

Giuseppe Ciccone, Oana Dobre, Graham M. Gibson, Jose Manuel Rey, Cristina Gonzalez–Garcia, Massimo Vassalli, Manuel Salmeron–Sanchez, Manlio Tassieri

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

It has been established that the mechanical properties of hydrogels control the fate of (stem) cells. However, despite its importance, a one-to-one correspondence between gels' stiffness and cell behavior is still missing from literature. In this work, the viscoelastic properties of poly(ethylene-glycol) (PEG)-based hydrogels are investigated by means of rheological measurements performed at different length scales. The outcomes of this work reveal that PEG-based hydrogels show significant stiffening when subjected to a compressional deformation, implying that conventional bulk rheology measurements may overestimate the stiffness of hydrogels by up to an order of magnitude. It is hypothesized that this apparent stiffening is caused by an induced “tensional state” of the gel network, due to the application of a compressional normal force during sample loading. Moreover, it is shown that the actual stiffness of the hydrogels is instead accurately determined by means of both passive-video-particle-tracking (PVPT) microrheology and nanoindentation measurements, which are inherently performed at the cell's length scale and in absence of any externally applied force in the case of PVPT. These results underpin a methodology for measuring hydrogels' linear viscoelastic properties that are representative of the mechanical constraints perceived by cells in 3D hydrogel cultures.

本文言語英語
論文番号2000517
ジャーナルAdvanced Healthcare Materials
9
17
DOI
出版ステータス出版済み - 9 1 2020
外部発表はい

All Science Journal Classification (ASJC) codes

  • 生体材料
  • 生体医工学
  • 薬科学

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