Related Experiment Video
Updated: Jun 20, 2026
Laminectomy for the Removal of Thoracic Ossification of the Ligamentum Flavum (TOLF) Using Ultrasonic and Conventional Osteotomes
Published on: April 21, 2023
Matrix metalloproteinase-3 on ligamentum flavum in degenerative lumbar spondylolisthesis
1Department of Orthopaedic Surgery, Kang-Nam St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Study Design:
Human ligamentum flavum (LF) was examined for the activity level of matrix metalloproteinase-3 (MMP-3) in degenerative spondylolithesis (DS) patients using immunohistochemistry, Western blot, reverse transcriptase-polymerase chain reaction (RT-PCR), and quantitative real-time PCR.
Objective:
To investigate the hypothesis that the activity of MMP-3 is elevated in LF of DS patients, which might contribute to DS pathogenesis.
Summary Of Background Data:
MMP-3 is a proteinase produced by connective tissue cells and is responsible for the degradation and modification of extracellular matrix molecules. MMP-3 activity has been established in articular cartilage, synovial membrane, and intervertebral discs, but not in the LF.
Methods:
The experimental group consisted of 18 patients with DS and the control group consisted of 18 patients with spinal stenosis (SS) without any instabilities. MMP-3 expression was measured with in situ using immunohistochemistry and both for mRNA and protein levels.
Results:
The MMP-3 positive cell ratio in the LF observed in DS patients was substantially higher than in SS patients (P = 0.030). In Western blot, the average optical density (OD) of MMP-3 was higher in LF of DS than of SS (P = 0.028). There was greater MMP-3 expression in DS patients as quantified by RT-PCR (P = 0.004).
Conclusion:
Our study shows that MMP-3 expression in the LF of DS patients was significantly higher than in SS patients. Increased MMP-3 expression may be associated with the degenerative changes of LF in DS patients comprising one of the mechanisms of pathogenesis in DS.
Insights
Matrix metalloproteinase-3 (MMP-3) levels are significantly elevated in the ligamentum flavum of degenerative spondylolisthesis patients. This finding suggests MMP-3 may play a key role in the pathogenesis of degenerative spondylolisthesis.
Area of Science:
- Biochemistry
- Orthopedics
- Spinal Surgery
Background:
- Matrix metalloproteinase-3 (MMP-3) is a key enzyme in extracellular matrix degradation.
- MMP-3 activity is known in cartilage and intervertebral discs but not previously in ligamentum flavum (LF).
Purpose of the Study:
- To investigate elevated MMP-3 activity in the LF of patients with degenerative spondylolisthesis (DS).
- To explore the potential role of MMP-3 in DS pathogenesis.
Main Methods:
- Human LF samples from 18 DS patients and 18 spinal stenosis (SS) patients were analyzed.
- Immunohistochemistry, Western blot, and RT-PCR were used to measure MMP-3 expression at protein and mRNA levels.
Main Results:
- MMP-3 positive cell ratio was significantly higher in LF from DS patients compared to SS patients (P=0.030).
- Western blot showed higher average optical density of MMP-3 in DS LF (P=0.028).
- RT-PCR confirmed significantly greater MMP-3 expression in DS patients (P=0.004).
Conclusions:
- MMP-3 expression in LF is significantly higher in DS patients than in SS patients.
- Increased MMP-3 expression is associated with degenerative changes in LF and may contribute to DS pathogenesis.
