Cell-seeded polyurethane-fibrin structures--a possible system for intervertebral disc regeneration

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedics

Background:

• Intervertebral disc (IVD) degeneration is a primary cause of low back pain, necessitating advanced regenerative treatments.
• Current treatments for degenerated IVD tissue are limited, driving the need for innovative biological regeneration strategies.
• Injectable materials for endoscopic implantation are gaining traction for nucleus pulposus (NP) regeneration.

Purpose of the Study:

• To develop a novel polyurethane (PU) scaffold for cell-based regeneration of degenerated IVD tissue.
• To evaluate the capacity of the PU scaffold to support autologous IVD-derived cells for NP regeneration.
• To assess cell adhesion, proliferation, and phenotypic stability within the PU scaffold for potential therapeutic applications.

Main Methods:

• Development of a mechanically stable PU scaffold in spheroid form for cell encapsulation.
• Seeding of primary human IVD cells onto PU spheroids and subsequent encapsulation in fibrin hydrogel.
• Analysis of cell-matrix interactions using gene expression (PCR) and biochemical assays (DNA, collagen, GAG content).

Main Results:

• Successful seeding and encapsulation of human IVD cells within the PU-fibrin construct.
• Demonstrated cell proliferation and synthesis of extracellular matrix components, including collagen and glycosaminoglycans (GAG).
• Confirmed stable mRNA expression of chondrogenic and NP-specific markers, indicating preserved cell phenotype.

Conclusions:

• The developed PU scaffold serves as a viable carrier for autologous IVD cells, promoting tissue regeneration.
• This approach shows potential for restoring chondrocyte-like tissue within the NP, mimicking native IVD structure.
• The study presents a promising alternative medical strategy for treating degenerated IVD tissue compared to existing options.