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Angiogenesis and inflammatory cell infiltration in lumbar disc herniation
Yoichi Koike1, Miwa Uzuki, Shoichi Kokubun
1Department of Orthopaedics, Tohoku University School of Medicine, Japan. yokoike@mail.cc.tohoku.ac.jp
Spine
|September 16, 2003
Summary
This study shows that vascular endothelial growth factor promotes new blood vessel formation in herniated discs, aiding macrophage infiltration and potentially contributing to natural hernia shrinkage.
Area of Science:
- Spinal Surgery
- Orthopedics
- Regenerative Medicine
Background:
- Limited understanding of blood vessel formation within the extracellular matrix of herniated discs.
- The role of angiogenesis in natural hernia shrinkage remains unclear.
Purpose of the Study:
- To investigate blood vessel formation in lumbar disc herniation.
- To elucidate the role of angiogenesis in the natural shrinking process of herniated discs.
Main Methods:
- Immunohistochemical analysis of 20 lumbar disc herniation samples.
- Utilized antibodies for CD34 (vascular endothelial cells), CD68 (macrophages), and vascular endothelial growth factor (VEGF).
Main Results:
- Vascular endothelial growth factor-expressing cells were abundant in granulation tissue within the cartilage matrix.
- Positive correlations were found between VEGF-positive cells and CD34+ cells (R=0.73, P<0.001).
- Significant positive correlation between CD34+ cells and CD68+ cells (R=0.66, P<0.001) surrounding newly formed lumens.
Conclusions:
- VEGF produced by spindle-shaped cells promotes angiogenesis in herniated disc granulation tissue.
- Newly formed blood vessels facilitate macrophage infiltration into the degenerated disc matrix.
- Angiogenesis appears to play a crucial role in the natural resolution of lumbar disc herniation.