Related Experiment Video
Updated: May 2, 2026
Diagnosis and Surgical Treatment of Human Brucellar Spondylodiscitis
Published on: May 23, 2021
Histopathological changes in supraspinous ligaments, ligamentum flava and paraspinal muscle tissues of patients with
Ying Zhang1, Hongfei Xu1, Xu Hu1
1Department of Orthopaedics, Xinqiao Hospital, the Third Military Medical University, Chongqing, China.
Objective:
To examine the histopathological changes in spinal tissues of ankylosing spondylitis (AS) patients.
Methods:
Tissue samples from 10 AS patients and 10 control subjects were obtained. Hematoxylin and eosin, picrosirius, Masson and van Gieson stainings were utilized to determine the pathological changes in tissues. Ultrastructural alterations were examined by electronic microscopy. Proteoglycan levels were assessed by enzyme-linked immunosorbent assays (ELISA). Matrix metalloproteinase-3 (MMP-3), transforming growth factor-β1 (TGF-β1) and tumor necrosis factor-α (TNF-α) levels were evaluated by immunohistochemistry.
Results:
Our results demonstrate that the density of collagen fibrils was reduced in the supraspinous ligaments of AS tissue and fibrils were loosely and irregularly organized as compared to a regular distribution of collagen fibrils in controls. In ligamentum flava from AS patients, activated fibroblasts with enlarged nuclei were detected, while the number of elastic fibers was greatly decreased. Paraspinal muscle tissues of AS patients exhibited increased collagen fibril accumulation and atrophy. Significantly decreased proteoglycan and elevated MMP-3 levels were found in supraspinous ligament samples from AS patients (P < 0.01). Additionally, the levels of TGF-β1 in ligamentum flava and paraspinal muscle tissues of AS patients were increased (P < 0.01). The expression of TNF-α was also upregulated in the ligamentum flavum (P < 0.01), with no significant difference in the paraspinal muscle between control and AS patients (P > 0.05).
Conclusions:
Our findings reveal histopathological changes that occur in certain spinal tissues of AS patients and suggest that increased levels of MMP-3 and TGF-β1 may contribute to the pathogenesis of AS.
