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Age effects on vascular smooth muscle: an engineered tissue approach
1Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA.
Cell Transplantation
|November 16, 2005
Summary
Tissue engineering using infant vascular cells shows enhanced blood vessel growth and physical properties compared to adult cells. This research has implications for aging, vascular disease, and regenerative medicine.
Area of Science:
- Biomaterials Science
- Vascular Biology
- Regenerative Medicine
Background:
- Tissue engineering of blood vessels presents a novel therapeutic approach for vascular occlusive diseases.
- It also provides a biomimetic 3D environment for studying vascular cell biology.
- Understanding the impact of cell age is crucial for optimizing engineered vascular grafts.
Purpose of the Study:
- To investigate the effect of vascular cell age on extracellular matrix deposition, cellular mitosis, and protein synthesis in engineered blood vessels.
- To compare the physical properties of engineered vessels grown from infant versus adult porcine vascular smooth muscle cells.
- To assess the differentiation state and collagen production in engineered vessels based on donor cell age.
Main Methods:
- Engineered blood vessels were created using a 3D polyglycolic acid (PGA) mesh seeded with either infant or adult porcine vascular smooth muscle cells.
- Vessels were subjected to pulsatile radial distension for 7 weeks to simulate physiological conditions.
- Cellular proliferation, extracellular matrix deposition, protein synthesis, and physical properties were analyzed.
Main Results:
- Engineered vessels from infant cells demonstrated significantly higher cellular proliferation, extracellular matrix deposition, and remodeling activity compared to those from adult cells.
- Vessels cultured from infant cells exhibited superior physical properties.
- While smooth muscle cell differentiation remained unchanged, immature pro-collagen levels were detected in infant-derived vessels, similar to native vessels, but not in adult-derived ones.
Conclusions:
- Vascular cell age critically influences the development and functional properties of engineered blood vessels.
- Infant-derived vascular cells yield superior tissue-engineered constructs with enhanced matrix deposition and physical characteristics.
- These findings are significant for advancing tissue engineering strategies for vascular repair and for understanding age-related vascular changes.