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A novel and efficient method for culturing mouse nucleus pulposus cells.

Junichi Kushioka1, Takashi Kaito1, Ryota Chijimatsu2

  • 1Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.

The Spine Journal : Official Journal of the North American Spine Society
|April 16, 2019
PubMed
Summary

Researchers developed new methods to culture mouse nucleus pulposus cells (mNPCs), crucial for intervertebral disc degeneration research. These techniques improve cell proliferation and maintain their characteristic gene expression for further study.

Keywords:
3D collagen gel cultureFibroblast growth factorFibronectin-coated dishMicromass cultureMouse nucleus pulposus cellsTransforming growth factor-β

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Area of Science:

  • Regenerative Medicine
  • Cell Biology
  • Biomaterials Science

Background:

  • Intervertebral disc degeneration (IDD) is a significant health issue, with nucleus pulposus (NP) degeneration being a primary driver.
  • Research into nucleus pulposus cells (NPCs) is critical for understanding and treating IDD.
  • Efficient methods for culturing mouse nucleus pulposus cells (mNPCs) are lacking, hindering research progress.

Purpose of the Study:

  • To establish efficient and reproducible in vitro culture methods for mouse nucleus pulposus cells (mNPCs).

Main Methods:

  • Primary 3D collagen gel culture of mNPCs followed by gene expression analysis.
  • Subsequent 2D culture on various bio-coated dishes with or without basic fibroblast growth factor (bFGF).
  • Micromass culture of sequentially cultured mNPCs with transforming growth factor-β3 (TGF-β3) to assess extracellular matrix (ECM) synthesis.

Main Results:

  • mNPCs in 3D gel culture maintained morphology and gene expression similar to native NP cells; monolayer culture was unsuitable for proliferation.
  • Fibronectin coating enhanced mNPC adhesion and proliferation in 2D culture; bFGF boosted proliferation but reduced characteristic gene expression with passaging.
  • Sequential 3D-gel and 2D culture followed by micromass culture, with TGF-β3, restored mNPC gene expression and enhanced ECM synthesis.

Conclusions:

  • Novel and efficient culture methods for mNPCs have been successfully established.
  • These methods facilitate improved cell-based and molecular research on mNPCs, advancing the study of intervertebral disc degeneration.