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Hyperosmolar expansion medium improves nucleus pulposus cell phenotype.

Lisanne T Laagland1, Frances C Bach1, Laura B Creemers2

  • 1Department of Clinical Sciences, Faculty of Veterinary Medicine Utrecht University Utrecht The Netherlands.

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|October 7, 2022
PubMed
Summary
This summary is machine-generated.

Increasing culture medium osmolarity enhances nucleus pulposus cells (NPCs) for intervertebral disc (IVD) regeneration. This optimization improves NPC phenotype and extracellular matrix production, boosting cell-based therapy potential for IVD repair.

Keywords:
cell‐based therapyintervertebral disclower back painnucleus pulposusosmolarityregeneration

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Cell Biology

Background:

  • Intervertebral disc (IVD) degeneration is a significant clinical problem.
  • Cell-based therapies using nucleus pulposus cells (NPCs) show promise for IVD regeneration.
  • Current limitations include low cell yield and compromised NPC phenotype.

Purpose of the Study:

  • To investigate the effect of increased culture medium osmolarity on dog NPC phenotype and extracellular matrix (ECM) production.
  • To optimize expansion conditions for enhanced NPC regenerative capacity.
  • To assess the impact of osmolarity on NPC markers and ECM in a 3D culture model.

Main Methods:

  • Dog NPCs were expanded in media with osmolarity adjusted to 300, 400, or 500 mOsm/L under normoxic and hypoxic conditions.
  • Expanded NPCs were cultured in a 3D chondrogenic model.
  • Evaluated cell proliferation, morphology, phenotype (gene and protein expression), and ECM production.

Main Results:

  • Expanding NPCs at 500 mOsm/L resulted in rounded morphology and reduced proliferation.
  • Increased osmolarity upregulated healthy NPC and progenitor markers at gene and protein levels (e.g., KRT18, ACAN, COL2, CD73).
  • NPCs expanded at 500 mOsm/L maintained phenotypic markers and produced healthy ECM in 3D culture, irrespective of oxygen levels.

Conclusions:

  • Elevated medium osmolarity during expansion improves dog NPC phenotype.
  • This optimization enhances the potential of NPCs for cell-based intervertebral disc regeneration therapies.
  • Higher osmolarity expansion conditions offer a promising strategy for improving cell therapy outcomes.