Extracellular matrices as advanced scaffolds for vascular tissue engineering

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Developing effective scaffolds is crucial for vascular tissue engineering.
• Extracellular matrix (ECM) derived from natural sources offers a promising alternative to synthetic materials.
• Porcine urinary bladder submucosa (PUB-SM) is a potential source for vascular scaffolds.

Purpose of the Study:

• To evaluate the potential of decellularized porcine urinary bladder extracellular matrix (ECM-UBM) as a scaffold for vascular tissue engineering.
• To characterize the microarchitecture, mechanical properties, and cell interactions of the ECM-UBM.
• To assess the suitability of ECM-UBM for in vitro vascular modeling.

Main Methods:

• Decellularization of porcine urinary bladder.
• Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and Laser Scanning Microscopy (LSCM) for microarchitecture analysis.
• Uniaxial tensile testing and contact-angle measurements for mechanical and surface properties.
• Cell culture studies with Human Aortic Endothelial Cells (HAECs) and Human Smooth Muscle Cells (HSMCs).

Main Results:

• ECM-UBM exhibits a porous, interconnected microarchitecture with preserved fibers and a micropatterned luminal surface.
• Tensile strength of the ECM-UBM sheet is comparable to native human artery, and multilamination enhances strength significantly.
• The material is hydrophilic and shows excellent adherence, spreading, and proliferation of vascular cells, preserving cell phenotype.
• ECM-UBM supports vascular cell growth and provides insights into scaffold remodeling capacity.

Conclusions:

• Decellularized porcine urinary bladder extracellular matrix is a viable biomaterial for vascular tissue engineering.
• ECM-UBM possesses favorable mechanical and biological properties for vascular regeneration.
• This scaffold material is suitable for developing in vitro models for vascular research and drug development.