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Varying mechanical forces drive sensory epithelium formation
Mingyu Xia1,2,3,4, Mingxuan Wu1,2, Yuanrong Li5,6,7
1ENT institute and Otorhinolaryngology Department of Eye & ENT Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai 200031, China.
Science Advances
|November 3, 2023
Summary
The extracellular matrix (ECM) stiffness guides sensory epithelium development. Moderate stiffness promotes progenitor cell expansion, while higher stiffness drives differentiation into sensory hair cells, offering insights for hair cell regeneration.
Area of Science:
- Developmental Biology
- Biomaterials Science
- Cell Biology
Background:
- Cellular responses to the microenvironment are crucial for development.
- Intracellular signaling in sensory epithelium development is known, but the driving forces remain unclear.
Purpose of the Study:
- To investigate the role of extracellular matrix (ECM) mechanical properties in sensory epithelium formation.
- To elucidate the molecular mechanisms by which ECM stiffness influences cochlear progenitor cell behavior.
Main Methods:
- Fabrication of a hybrid hydrogel with tunable mechanical properties for cochlear organoid culture.
- Analysis of cell signaling pathways (Integrin α3/F-actin/YAP, Ca2+/PIEZO2/KLF2) in response to varying ECM stiffness.
- Stage-dependent assessment of cochlear progenitor cell (CPC) expansion and differentiation.
Main Results:
- ECM stiffness-dependent regulation of sensory epithelium formation was revealed.
- Moderate ECM stiffness promoted cochlear progenitor cell (CPC)-derived epithelial organoid expansion via ITGA3/F-actin/YAP signaling.
- Higher ECM stiffness induced CPCs to differentiate into sensory hair cells (HCs) through Ca2+/PIEZO2/KLF2 signaling.
Conclusions:
- ECM mechanical cues, specifically stiffness, are identified as key drivers of sensory epithelium formation.
- A molecular mechanism linking ECM stiffness to cell fate decisions (expansion vs. differentiation) in cochlear development is elucidated.
- Findings provide a foundation for therapeutic strategies aimed at regenerating sensory hair cells.
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