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Optical sensing of mechanical pressure within biological tissues.

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Diffusion and transport of small molecules within hydrogel networks are of high interest for biomedical and pharmaceutical research. Herein, using fluorescence correlation spectroscopy (FCS), we experimentally showed that the diffusion time of small dyes in the hydrogel was directly related to the mechanical state (compression or swelling).

Following this observation, we developed cell-like barometers in the form of PAA microbeads,which when incorporated between cells and combined with a diffusion-based optical readout could serve as the first biosensors to measure the local pressure inside the growing biological tissues. To illustrate the potential of the present method, we used multicellular spheroids (MCS) as a tissuemodel, and it was observed that the growthassociated tissue stress was lower than 1 kPa, but significantly increased when an external compressive stress was applied.

The article has been pûblished in Soft Mater.