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Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
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Microarray analysis of laser capture microdissected-anulus cells from the human intervertebral disc.

Helen E Gruber1, Jean-Luc Mougeot, Gretchen Hoelscher

  • 1Department of Orthopaedic Surgery, Carolinas Medical Center, Charlotte, NC 28232, USA. helen.gruber@carolinashealthcare.org

Spine
|May 15, 2007
PubMed
Summary

Laser capture microdissection (LCM) successfully harvested cells for gene expression profiling in degenerated human intervertebral discs. This method enables analysis of gene changes critical to understanding disc aging and degeneration.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Orthopedics

Background:

  • Gene expression is vital for intervertebral disc health, including extracellular matrix maintenance and cell viability.
  • Disc degeneration leads to reduced cell numbers, complicating gene expression studies.
  • Understanding gene expression changes is crucial for addressing disc aging and degeneration.

Purpose of the Study:

  • To employ laser capture microdissection (LCM) for isolating cells from human annulus tissue.
  • To perform microarray analysis for deriving gene expression profiles from these cells.
  • To identify differentially expressed genes associated with intervertebral disc degeneration.

Main Methods:

  • Laser capture microdissection (LCM) was used to collect cells from paraffin-embedded human annulus sections.
  • Gene expression profiling was conducted using Affymetrix GeneChip Human X3P arrays.
  • Statistical analyses, including ANOVA and SAM permutation, identified significantly differentially expressed genes.

Main Results:

  • 47 genes showed significant differential expression between disc degeneration grades (P < 0.001).
  • Compared to healthy discs, Grade III and IV discs exhibited 13 up-regulated and 19 down-regulated genes.
  • Key genes involved cell senescence, hypoxia, and inflammation, such as heat-shock protein 70 interacting protein and interleukin-23p19.

Conclusions:

  • Laser capture microdissection (LCM) is effective for obtaining sufficient mRNA from sparse cells in human annulus tissue for microarray analysis.
  • The findings enhance the understanding of molecular mechanisms underlying disc aging and degeneration.
  • LCM provides a valuable method for studying gene expression in challenging clinical tissue samples.