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Extracellular matrix presentation modulates vascular smooth muscle cell mechanotransduction
Olga V Sazonova1, Brett C Isenberg1, Jacob Herrmann1
1Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA.
Summary
Vascular smooth muscle cell (VSMC) behavior, crucial in atherosclerosis, depends on both extracellular matrix (ECM) stiffness and its biochemical composition. The study reveals opposing cellular responses to ECM stiffening based on specific ECM proteins like fibronectin and laminin.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Cardiovascular Research
Background:
- Atherosclerosis involves changes in vascular smooth muscle cells (VSMCs) and extracellular matrix (ECM) remodeling.
- VSMC behavior is sensitive to the mechanical properties and composition of the ECM.
- ECM changes in atherosclerosis likely contribute to disease pathology.
Purpose of the Study:
- To investigate the interdependence of ECM mechanics and biochemistry in regulating VSMC behavior.
- To determine how ligand presentation affects stiffness-mediated VSMC responses.
Main Methods:
- Culturing VSMCs on fibronectin (Fn)- and laminin (Ln)-coated substrates with varying stiffness.
- Analyzing VSMC adhesion, spreading, cytoskeletal polymerization, and focal adhesion assembly.
- Measuring myosin light chain (MLC) phosphorylation and cell elongation.
Main Results:
- VSMC responses to substrate stiffening were dependent on the ECM ligand (fibronectin or laminin).
- Fibronectin substrates showed augmented VSMC responses to stiffness, while laminin substrates showed dampened responses.
- Differential effects on MLC phosphorylation and cell elongation were observed based on ligand type and stiffness.
Conclusions:
- ECM mechanics and biochemistry jointly regulate VSMC phenotype.
- Cellular responses to ECM stiffening are context-dependent, influenced by specific ECM proteins.
- Understanding the interplay between ECM mechanics and biochemistry is vital for insights into vascular wall function and disease.
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