title: Characterization of the age-dependent intervertebral disc changes in rabbit by correlation between MRI, histology and gene expression.
abstract: BACKGROUND
  The present study was conducted to address whether the intervertebral disc of rabbit could be considered (i) as a valuable model to provide new insights into the tissue and cellular changes of Nucleus pulposus aging and (ii) as an appropriate tool to investigate the efficacy of Nucleus pulposus cell-based biotherapies.
  
  
  METHODS
  Lumbar intervertebral disc from rabbits with increasing ages (1, 6 and 30 month-old) were compared by MRI and histological observation using Pfirrmann's grading and Boos' scoring respectively. The expression of transcripts (COL2A1, AGC1, COL1A1, MMP13, BMP2, MGP and p21) in Nucleus pulposus cells were analysed by quantitative real-time PCR.
  
  
  RESULTS
  MRI analysis indicated an early age-dependent increase in the Pfirrmann's grading. Histological Boos' scoring was also increased. The analysis of transcript expression levels showed that COL2A1 and AGC1 were down-regulated as a function of age. Conversely, COL1A1, MMP-13, BMP-2, MGP and p21 were significantly up-regulated in the Nucleus pulposus cells of aged rabbit intervertebral disc.
  
  
  CONCLUSIONS
  Our study describes the consistency of the rabbit as a model of intervertebral disc changes as a function of age by correlating tissue alteration with cellular modification measured.
authors: INSERM (Institut National de la Santé et de la Recherche Médicale) U791, LIOAD, Group Skeletal Tissue Engineering and Physiopathology (STEP), University of Nantes, Nantes F-44042, France.
authors: Johann
authors: J
authors: Clouet
authors: Marianne
authors: M
authors: Pot-Vaucel
authors: Gaël
authors: G
authors: Grimandi
authors: Martial
authors: M
authors: Masson
authors: Julie
authors: J
authors: Lesoeur
authors: Borhane H
authors: BH
authors: Fellah
authors: Olivier
authors: O
authors: Gauthier
authors: Marion
authors: M
authors: Fusellier
authors: Yan
authors: Y
authors: Cherel
authors: Yves
authors: Y
authors: Maugars
authors: Jérôme
authors: J
authors: Guicheux
authors: Claire
authors: C
authors: Vinatier
mesh_terms: D000375:Aging / Q000378:metabolism* / Q000473:pathology*; D000818:Animals; D000831:Animals, Newborn; D004195:Disease Models, Animal; D015536:Down-Regulation / Q000235:genetics; D016326:Extracellular Matrix Proteins / Q000096:biosynthesis / Q000235:genetics*; D018507:Gene Expression Regulation, Developmental / Q000502:physiology*; D007403:Intervertebral Disc / Q000378:metabolism* / Q000473:pathology / Q000502:physiology; D008279:Magnetic Resonance Imaging / Q000379:methods; D011817:Rabbits; D015854:Up-Regulation / Q000235:genetics
chemical_list: D016326:Extracellular Matrix Proteins