Spatial regulation of substrate adhesion directs fibroblast morphotype and phenotype

Area of Science:

• Cell Biology
• Biomaterials Science
• Tissue Engineering

Background:

• Fibroblast to myofibroblast differentiation is central to tissue repair and pathology.
• Cellular phenotype is influenced by biochemical, mechanical, and physical environmental cues.
• The precise role of cell adhesion geometry in regulating fibroblast phenotype remains unclear.

Purpose of the Study:

• To investigate how the spatial arrangement of focal adhesions (FAs) influences dermal fibroblast phenotype.
• To determine if controlling FA geometry can direct fibroblast cell-state transitions.
• To explore novel mechanisms for regulating fibroblast phenotype beyond established pathways.

Main Methods:

• Utilized protein micropatterning to precisely control fibroblast adhesion sites.
• Developed an automated morphometry pipeline to analyze cell morphology and FA characteristics.
• Investigated the impact of linear fibronectin patterns on fibroblast phenotype and alpha-smooth muscle actin expression.

Main Results:

• Spatial configuration of FAs, specifically FA eccentricity, is a key determinant of fibroblast phenotype.
• Constraining FAs using linear fibronectin patterns induced a distinct phenotype transition.
• Observed dispersed alpha-smooth muscle actin expression, suggesting regulation beyond the canonical fibroblast-myofibroblast axis.

Conclusions:

• The spatial organization of cell adhesion to the microenvironment is a critical regulator of fibroblast morphotype and phenotype.
• Focal adhesion geometry offers a powerful tool for controlling fibroblast behavior in biological contexts.
• This study provides new insights into fibroblast phenotype plasticity and potential therapeutic targets.