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Updated: Jun 27, 2026
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An In Vitro Organ Culture Model of the Murine Intervertebral Disc
Published on: April 11, 2017
Nucleus pulposus explant culture model
Gang Feng1, Yuqing Wan, Francis H Shen
1Department of Orthopaedic Surgery, University of Virginia School of Medicine, Charlottesville, Virginia 22908, USA.
Summary
This study developed an in vitro nucleus pulposus (NP) explant model. This model effectively maintains key proteins and allows evaluation of gene therapy for disc degeneration.
Area of Science:
- Biomedical Engineering
- Regenerative Medicine
- Cell Biology
Background:
- Intervertebral disc degeneration (IDD) treatments often aim to repopulate nucleus pulposus (NP) tissue.
- NP cells are heterogeneous and poorly characterized, complicating therapeutic development.
Purpose of the Study:
- To investigate NP explant culture as a model for studying NP cell behavior.
- To evaluate the maintenance of NP-specific gene and protein expression in vitro.
- To assess the feasibility of using NP explants for gene therapy evaluation.
Main Methods:
- Culturing NP explants in vitro with or without chondrogenic reagents.
- Analyzing morphology, gene/protein expression (collagen II, aggrecan), and apoptosis.
- Comparing NP explant responses to GDF5 protein treatment, plasmid transfection, and adenovirus infection.
Main Results:
- NP explant cultures maintained collagen II and aggrecan expression up to 7 days in chondrogenic medium.
- Expression levels after 14 days in vitro exceeded those of fresh NP tissue, regardless of medium.
- NP explants responded to growth factor treatment and were amenable to gene transfer via plasmid and viral vectors.
Conclusions:
- NP explant culture provides a robust in vitro model for characterizing NP cells.
- This model facilitates the evaluation of potential therapeutic reagents and gene therapy strategies for disc degeneration.
- The model supports the maintenance of crucial NP extracellular matrix components in vitro.
