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Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
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Cartilage intermediate layer protein promotes lumbar disc degeneration
Shoji Seki1, Noriyuki Tsumaki2, Hiraku Motomura1
1Department of Orthopedic Surgery, Faculty of Medicine, University of Toyama, 2630 Sugitani, Toyama, Toyama 930-0194, Japan.
Biochemical and Biophysical Research Communications
|March 18, 2014
Summary
Cartilage intermediate layer protein (CILP) promotes lumbar disc disease (LDD) and intervertebral disc degeneration in vivo. Overexpression of CILP in nucleus pulposus cells exacerbates LDD pathogenesis by suppressing TGF-beta signaling.
Area of Science:
- Biochemistry
- Molecular Biology
- Musculoskeletal Disorders
Background:
- Lumbar disc disease (LDD) is a prevalent musculoskeletal disorder linked to intervertebral disc degeneration.
- Cartilage intermediate layer protein (CILP) is associated with LDD and inhibits cartilage matrix gene expression in nucleus pulposus (NP) cells in vitro.
- The in vivo mechanisms underlying CILP's role in LDD pathogenesis remain unclear.
Purpose of the Study:
- To investigate the in vivo role of CILP in the pathogenesis of lumbar disc disease.
- To determine if CILP exacerbates intervertebral disc degeneration in a mouse model.
Main Methods:
- Generation of transgenic mice overexpressing CILP specifically in intervertebral disc tissues.
- Assessment of disc degeneration using magnetic resonance imaging (MRI) and histological analysis.
- Measurement of Smad2/3 phosphorylation levels in intervertebral discs to evaluate TGF-beta signaling suppression.
Main Results:
- Transgenic mice exhibited significant lumbar disc degeneration, despite a normal macroscopic skeletal phenotype.
- MRI revealed reduced nucleus pulposus signal intensity in CILP-overexpressing discs.
- A significant decrease in phosphorylated Smad2/3 positive cells was observed in the NP of CILP transgenic mice compared to controls.
Conclusions:
- Overexpression of CILP in the nucleus pulposus promotes intervertebral disc degeneration.
- CILP plays a direct role in the pathogenesis of lumbar disc disease in vivo.
- CILP-induced suppression of TGF-beta signaling contributes to LDD progression.
Keywords:
Cartilage intermediate layer proteinLumbar disc degenerationTissue specific promoterTransforming growth factor-betaTransgenic miceMore Related Videos
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