Accelerating neovascularization and kidney tissue formation with a 3D vascular scaffold capturing native vascular...

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Tissue Engineering

Background:

• Vascularization of 3D bioengineered tissues is a significant challenge.
• Previous work created a kidney vasculature-mimetic scaffold using vascular corrosion casting.
• Enhancing scaffold vascularization is crucial for tissue survival and function.

Purpose of the Study:

• To functionalize a collagen vascular scaffold with vascular endothelial growth factor (VEGF) for enhanced vascularization.
• To evaluate the angiogenic potential and in vivo efficacy of the VEGF-functionalized scaffold.
• To assess the impact of improved vascularization on implanted cell survival and tissue formation.

Main Methods:

• Fabrication of a collagen vascular scaffold mimicking native kidney vasculature.
• Functionalization of the scaffold with controlled release of vascular endothelial growth factor (VEGF).
• In vitro assessment of angiogenic capability in 2D and 3D models.
• In vivo implantation of VEGF-functionalized scaffold seeded with human renal cells into rat kidneys.

Main Results:

• The VEGF vascular scaffold demonstrated enhanced angiogenic capability in vitro.
• In vivo implantation led to improved vascularization of the scaffold.
• Reduced apoptosis of implanted human renal cells was observed.
• Formation of hybrid renal tubule-like structures composed of human and host cells.

Conclusions:

• Early vascularization is critical for the success of bioengineered kidney scaffolds.
• VEGF incorporation into geometrically mimetic vascular scaffolds promotes vascularization and cell survival.
• This approach facilitates the formation of functional renal tissue structures, reducing cell death.