Development of a unique tissue-engineered in vitro vascular model with endothelial layer-inverted vascular tissue...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Vascular Biology

Background:

• Developing accurate vascular models is crucial for drug toxicity testing.
• Existing models often involve artificial materials that can interfere with results.
• Cellular self-assembly offers a promising approach for creating biomimetic tissues.

Purpose of the Study:

• To create stable, fiber-shaped vascular tissue constructs using cell self-aggregation.
• To evaluate the potential of these constructs as models for vascular toxicity testing.
• To assess the impact of toxicants on the engineered vascular tissues.

Main Methods:

• Utilized a cell self-aggregation technique with human umbilical vein endothelial cells and mesenchymal stem cells.
• Employed a dumbbell-shaped culture groove for precise tissue positioning.
• Histological analysis and exposure to cadmium chloride were used to evaluate tissue structure and response.

Main Results:

• Successfully fabricated stable, fiber-shaped cell aggregates that maintained integrity for over two weeks.
• The constructs exhibited a unique tissue architecture with a continuous endothelial layer and internal capillary-like structures.
• Exposure to cadmium chloride caused targeted disintegration of the outer endothelial layer while preserving the overall tissue shape.

Conclusions:

• The developed vascularized fiber-shaped tissue constructs are robust and biomimetic.
• These constructs serve as effective models for vascular toxicity assessment, avoiding gel adsorption artifacts.
• This technology facilitates reliable, long-term evaluation of drug effects and toxicant responses on vascular tissues.