Cytoplasmic crowding drives intracellular viscoelastic increase during epithelial maturation.

Cytoplasmic viscoelasticity in Madin-Darby canine kidney epithelial monolayers increases substantially during maturation, scaling linearly with dry mass concentration as cell density rises.

• Why it matters: It remains unclear how intracellular rheology adapts as epithelial tissues mature, despite the cytoplasm being a crowded, active medium that supports key cellular functions.
• What they did: The study used magnetic rotational spectroscopy to measure zero-shear viscosity and elastic modulus across monolayer maturation while varying cell density, and applied hyperosmotic perturbations to subconfluent monolayers.
• The result: Intracellular viscoelasticity is enhanced with increasing cell density and dry mass concentration, and hyperosmotic perturbations reproduce the effect, supporting cytoplasmic crowding as a driver and enabling a dry-mass–based coupling framework.

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