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Aquaporin-1 Expression in Herniated Human Lumbar Intervertebral Discs
Haydn Hoffman1,2, Aaron W Choi1,3, Victor Chang1
1University of California, Los Angeles, CA, USA.
Global Spine Journal
|May 17, 2017
Summary
Aquaporin-1 (AQP1) is present in degenerated intervertebral discs (IVDs) and correlates with disc hydration. This finding suggests AQP1 may play a role in disc degeneration.
Area of Science:
- Biomedical Science
- Orthopedics
- Radiology
Background:
- Intervertebral disc (IVD) degeneration, a cause of spondylosis, is linked to disc dehydration.
- The precise pathogenesis of IVD degeneration remains poorly understood.
Purpose of the Study:
- To identify and quantify aquaporin-1 (AQP1) in human degenerated IVDs.
- To investigate the relationship between AQP1 levels and MRI T2 signal intensity in IVDs.
Main Methods:
- Case series of nucleus pulposus (NP) tissue from 18 patients undergoing surgery for lumbar disc herniation.
- Immunohistochemistry and Western blot analysis to detect and quantify AQP1 expression.
- Comparison of AQP1 expression with preoperative T2-weighted MRI signal intensity.
Main Results:
- AQP1 was detected in all human degenerated IVD samples.
- AQP1 expression showed a strong linear correlation with MRI T2 signal intensity at both L4/5 (R² = 0.90) and L5/S1 (R² = 0.92) levels.
- Higher AQP1 expression was observed at L5/S1 compared to L4/5, though not statistically significant (P = .10).
Conclusions:
- Aquaporin-1 (AQP1) is detectable in human intervertebral discs (IVDs).
- Increased AQP1 expression is associated with greater disc hydration, as indicated by T2-weighted MRI signal intensity.
- AQP1 may be involved in the dehydration process contributing to disc degeneration.
