Composite electrospun scaffolds for engineering tubular bone grafts

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Poly (epsilon-caprolactone) (PCL) is a biocompatible polymer widely used in biomedical applications.
• Collagen is a key component of the extracellular matrix, crucial for cell adhesion and tissue regeneration.
• Developing advanced scaffolds is essential for effective bone tissue engineering.

Purpose of the Study:

• To fabricate and characterize poly (epsilon-caprolactone)/collagen (PCL/Col) composite scaffolds using electrospinning.
• To evaluate the influence of PCL/Col scaffolds on pig bone marrow mesenchymal cell (pBMMC) behavior and osteogenic differentiation.
• To engineer tubular bone analogs using PCL/Col scaffolds and osteogenic cell sheets.

Main Methods:

• Electrospinning of PCL and PCL/Col composite fibers.
• Cell culture of pBMMCs on fibrous meshes.
• Immunohistochemistry to assess osteogenic differentiation markers (collagen type I, osteopontin, osteocalcin).
• Assessment of matrix mineralization.
• Fabrication of hollow cylindrical cell-scaffold constructs.
• Dynamic culture conditions for enhanced tissue formation.

Main Results:

• Collagen incorporation on PCL fiber surfaces improved pBMMC attachment and proliferation.
• Enhanced expression of osteogenic differentiation markers on PCL/Col scaffolds.
• Matrix mineralization was observed on osteogenically induced PCL/Col constructs.
• Engineered tubular bone analogs showed enhanced bone-like tissue formation and mechanical strength under dynamic culture.
• PCL/Col scaffolds supported osteogenic differentiation and tissue development.

Conclusions:

• Electrospun PCL/Col mesh is a promising biomaterial for bone engineering.
• Combining PCL/Col scaffolds with osteogenic cell sheets offers a novel strategy for tubular bone analog engineering.
• This approach holds potential for advancing bone regenerative medicine applications.