ECM stiffness affects cargo sorting into MSC-EVs to regulate their secretion and uptake behaviors
Zhixiao Liu1, Yingying Liu2, Yu Li3,4
1Department of Histology and Embryology, College of Basic Medicine, Naval Medical University, Shanghai, 200433, China.
Journal of Nanobiotechnology
|March 22, 2024
Summary
Extracellular matrix stiffness controls how mesenchymal stem cell-derived extracellular vesicles (MSC-EVs) are made and delivered. Changing stiffness alters MSC-EV cargo sorting, impacting their function.
Area of Science:
- Biophysics
- Cell Biology
- Nanomedicine
Background:
- Mesenchymal stem cell-derived extracellular vesicles (MSC-EVs) are promising nanomedicines and drug delivery systems.
- The precise mechanisms governing MSC-EV secretion and delivery are not fully understood.
- Understanding these mechanisms is crucial for optimizing MSC-EV-based therapies.
Purpose of the Study:
- To investigate the role of extracellular matrix (ECM) stiffness in regulating MSC-EV secretion and delivery.
- To elucidate the biophysical mechanisms by which ECM stiffness influences MSC-EV cargo sorting.
- To establish a link between ECM properties and MSC-EV biological behavior.
Main Methods:
- Utilized varying substrate stiffness to culture mesenchymal stem cells (MSCs).
- Employed multi-omics analysis to identify changes in MSC-EV cargo.
- Assessed the impact of altered MSC-EVs on macrophage uptake.
Main Results:
- Decreased ECM stiffness mechanically altered MSCs' cargo sorting processes.
- Reduced stiffness impeded the incorporation of specific proteins and lipids into MSC-EVs, affecting secretion.
- Impaired MSC-EV secretion and subsequent macrophage uptake were observed on softer substrates.
Conclusions:
- ECM stiffness is a critical biophysical regulator of MSC-EV secretion and delivery.
- Modulating substrate stiffness offers a method to control MSC-EV characteristics.
- This provides a foundation for designing advanced biomaterials for MSC-EV applications.
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