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Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy
Published on: May 29, 2012
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Identifying compositional and structural changes in the nucleus pulposus from patients with lumbar disc herniation
Xuehui Wang1,2, Jianfang Meng3, Tongxing Zhang4
1First Central Clinical College, Tianjin Medical University, Tianjin 300070, P.R. China.
Experimental and Therapeutic Medicine
|June 16, 2020
Summary
Raman spectroscopy reveals biochemical changes in intervertebral disc degeneration (IDD), a cause of lower back pain (LBP). Degenerative discs show lower proteoglycans and more disordered collagen, correlating with MRI-based degeneration grades.
Area of Science:
- Biochemistry
- Biophysics
- Medical Imaging
Background:
- Lower back pain (LBP) is a prevalent global health issue, frequently linked to intervertebral disc degeneration (IDD).
- Understanding the biochemical mechanisms of IDD, particularly changes in nucleus pulposus (NP) composition, is crucial for effective LBP management.
- Key features of IDD include diminished proteoglycans and type II collagen within the NP.
Purpose of the Study:
- To investigate the biochemical alterations in nucleus pulposus (NP) during intervertebral disc degeneration (IDD) using Raman spectroscopy.
- To correlate Raman spectroscopic findings with magnetic resonance imaging (MRI) based degeneration grades (Pfirrmann grades).
- To elucidate the role of collagen structure and proteoglycan content in the pathogenesis of IDD.
Main Methods:
- Analysis of 30 nucleus pulposus (NP) tissue samples from patients undergoing spinal fusion surgery for lumbar disc herniation.
- Pre-operative classification of disc degeneration using 3.0T T2-weighted MRI to determine Pfirrmann grades and measure T2 signal intensity.
- Quantitative biochemical analysis of NP samples using Laser MicroRaman Spectroscopy at room temperature.
Main Results:
- A significant inverse correlation was observed between proteoglycan content (I1064/I1004 ratio) and Pfirrmann grade (ρ=-0.6462, P<0.0001).
- Collagen content (Amide I band) showed a significant positive correlation with Pfirrmann grade (ρ=0.5141, P<0.01).
- An increased ratio of I1670/I1640 (Amide I) indicated a higher proportion of disordered collagen, suggesting structural defects.
Conclusions:
- Raman spectroscopy effectively quantifies biochemical changes associated with intervertebral disc degeneration (IDD).
- Decreased proteoglycans and increased disordered collagen are biochemical hallmarks of advanced IDD, correlating with clinical and imaging assessments.
- Defective collagen structure is implicated as a contributing factor to nucleus pulposus abnormalities in IDD.
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