Importance of endogenous extracellular matrix in biomechanical properties of human skin model.

Abstract:

:The physical and mechanical properties of cells modulate their behavior such proliferation rate, migration and extracellular matrix remodeling. In order to study cell behavior in a tissue-like environment in vitro, it is of utmost importance to develop biologically and physically relevant 3D cell models. Here, we characterized the physical properties of a single cell type growing in configurations of increasing complexity. From one human skin biopsy, primary dermal fibroblasts were isolated and seeded to give monolayer (2D model), spheroid (3D model poor in extracellular matrix) and tissue-engineered cell sheet (3D model rich in endogenous extracellular matrix). Living native human dermis tissue was used as a gold standard. Nanomechanical and viscoelastic properties at the cell scale were measured by atomic force microscopy (AFM) while biphoton microscopy allowed collagen detection by second harmonic generation and scanning electron microscopy helped in model morphological characterization. In all models, fibroblasts presented a similar typical elongated cell shape, with a cytoskeleton well-arranged along the long axis of the cell. However, elastic moduli of the tissue-engineered cell sheet and native dermis tissue were similar and statistically lower than monolayer and spheroid models. We successfully carried out AFM force measurements on 3D models such as spheroids and tissue-engineered cell sheets, as well as on living native human tissue. We demonstrated that a tissue-engineered dermal model recapitulates the mechanical properties of human native dermal tissue unlike the classically used monolayer and spheroid models. Furthermore, we give statistical evidence to indicate a correlation between cell mechanical properties and the presence of collagens in the models studied.

journal_name

Biofabrication

journal_title

Biofabrication

authors

Pillet F,Gibot L,Madi M,Rols MP,Dague E

doi

10.1088/1758-5090/aa6ed5

subject

Has Abstract

pub_date

2017-05-11 00:00:00

pages

025017

issue

2

eissn

1758-5082

issn

1758-5090

journal_volume

9

pub_type

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