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Published on: November 25, 2011
Construction of a tissue-engineered annulus fibrosus
Hongsik Cho1, Sang-Hyug Park, Kwideok Park
1University of Tennessee Health Science Center, 1030 Jefferson Avenue, Memphis, TN 38138, USA.
Artificial Organs
|April 30, 2013
Summary
This study developed a scaffold-free annulus fibrosus (AF) construct using pig AF cells. The engineered AF tissue closely mimics native AF, showing potential for treating damaged intervertebral discs.
Area of Science:
- Regenerative Medicine
- Biomaterials Engineering
- Orthopedic Tissue Engineering
Background:
- The annulus fibrosus (AF) is crucial for intervertebral disc integrity but has limited regenerative capacity.
- Current scaffold-based tissue engineering methods for AF constructs face limitations in differentiation and culture systems.
- Developing effective AF tissue replacements is vital for treating disc degeneration and herniation.
Purpose of the Study:
- To characterize a novel, expandable, scaffold-free neoconstruct derived from autologous AF cells.
- To compare the engineered scaffold-free construct with native AF tissue in terms of structure, composition, and gene expression.
- To assess the potential of this scaffold-free approach for in vitro expansion and future transplantation.
Main Methods:
- Autologous AF cells from mature pigs were cultured in monolayers, then formed into pellets to create scaffold-free constructs.
- Pellet cultures were incubated for 24 hours, then transferred to flasks for 21 days of further matrix synthesis.
- Constructs were analyzed for cell viability, gene expression (e.g., aggrecan), histological architecture, and biochemical composition (glycosaminoglycan content).
Main Results:
- Cell viability remained above 90% throughout the 21-day culture period.
- The engineered scaffold-free AF construct exhibited morphological and biochemical characteristics highly similar to native AF tissue.
- Aggrecan expression was elevated in the engineered construct, while glycosaminoglycan content showed no significant difference compared to native AF.
Conclusions:
- Scaffold-free tissue constructs can be successfully engineered from AF cells using a pellet-culture method.
- These constructs demonstrate promising similarities to native AF tissue, including cell density and biochemical composition.
- This scaffold-free approach offers a viable strategy for in vitro expansion of AF tissue for potential therapeutic applications in damaged discs.
