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Senescence in human intervertebral discs.

S Roberts1, E H Evans, D Kletsas

  • 1Centre for Spinal Studies, Robert Jones and Agnes Hunt Orthopaedic and District Hospital, NHS Trust, Oswestry, Shropshire, SY10 7AG, UK. Sally.Roberts@rjah.nhs.uk

European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
|June 15, 2006
PubMed
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Cell senescence, a marker of aging cells, is significantly increased in herniated intervertebral discs, especially in the nucleus pulposus. This finding suggests senescent cells may contribute to disc degeneration and impact cell therapy efficacy.

Area of Science:

  • Biomedical Science
  • Cell Biology
  • Orthopedics

Background:

  • Intervertebral disc degeneration is a common cause of back pain and herniation.
  • Cell senescence is implicated in connective tissue aging and degeneration.
  • The role of cell senescence in disc disorders remains unclear.

Purpose of the Study:

  • To investigate the degree of cell senescence in intervertebral discs from patients with various disc disorders.
  • To compare senescence levels in different disc regions (annulus fibrosus vs. nucleus pulposus) and cell cluster formations.

Main Methods:

  • Discs were obtained from patients with herniated discs, degenerative disc disease, spondylolisthesis, scoliosis, and post-mortem controls.
  • Tissue sections were analyzed for senescence-associated-beta-galactosidase (SA-beta-Gal) positive cells.

Related Experiment Videos

  • Cellular senescence and cell clustering were quantified in annulus fibrosus and nucleus pulposus.

    • Main Results:

    • Herniated discs showed significantly higher SA-beta-Gal positive cells (8.5%) compared to other conditions (0.5%).
    • The nucleus pulposus exhibited more senescence than the annulus fibrosus.
    • In herniated discs, senescent cells were more prevalent in cell clusters (25.5%) than in non-clustered cells (4.2%).

    Conclusions:

    • Increased cell senescence is a prominent feature of herniated intervertebral discs, particularly within the nucleus pulposus.
    • Senescent cells may contribute to disc matrix damage and pathogenesis.
    • These findings raise concerns about the suitability of cells from herniated discs for regenerative therapies.