Construction and assessment of bio-engineered intervertebral discs

Area of Science:

• Biomaterials Engineering
• Regenerative Medicine
• Orthopedics

Background:

• Intervertebral disc degeneration is a significant cause of low back pain.
• Current treatments are limited, highlighting the need for novel regenerative strategies.
• Tissue engineering offers a promising approach for regenerating damaged intervertebral discs.

Purpose of the Study:

• To evaluate the efficacy of bone marrow-mesenchymal stem cells (BM-MSCs) co-cultured with nucleus pulposus cells (NPs) for intervertebral disc (IVD) engineering.
• To assess the role of polylactic acid-polyglycolic acid (PLGA) scaffolds in supporting cell growth and IVD regeneration.
• To investigate the impact of this approach on the histological and biochemical properties of engineered discs.

Main Methods:

• BM-MSCs and fetal NPs were cultured and seeded onto PLGA scaffolds.
• Co-cultures were observed using inverted and scanning electron microscopy.
• Engineered constructs were implanted into rabbit IVDs, with controls receiving cells without scaffolds.
• Intervertebral signal intensity, proteoglycan, and type II collagen levels were analyzed post-implantation.

Main Results:

• BM-MSCs adopted fibro-like phenotypes when co-cultured with NPs and maintained normal morphology on PLGA scaffolds.
• Significant increases in proteoglycan and type II collagen expression were observed in the PLGA scaffold group compared to the scaffold-free control group.
• Thompson grading indicated improved intervertebral signal intensity in the scaffold group.

Conclusions:

• Co-culturing BM-MSCs with NPs enhances their differentiation into NP-like cells, promoting disc regeneration.
• PLGA scaffolds provide a suitable environment for cell growth, preserving mechanical properties and structural integrity of engineered tissues.
• This study demonstrates a viable strategy for developing non-degenerate, tissue-engineered discs.