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Hypertrophy of the ligamentum flavum in lumbar spinal canal stenosis is associated with increased bFGF expression

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Abstract

Purpose

A prospective study was undertaken to investigate basic fibroblast growth factor (bFGF) expression in hypertrophic ligamentum flavum (LF) from patients with lumbar spinal canal stenosis (LSCS) and to determine whether there was a correlation of bFGF expression with LF thickness.

Methods

Twenty patients with lumbar spinal canal stenosis were enrolled in this study. bFGF mRNA and protein expressions in LF were analyzed using quantitative reverse transcriptase-polymerase chain reaction (RT-PCR), immunohistochemistry, and enzyme-linked immunosorbent assay (ELISA), respectively. The thickness of LF was measured by axial T1-weighted magnetic resonance imaging.

Results

Expression of bFGF was substantially higher in the hypertrophic LF group than in the control group (P < 0.001) as quantified by quantitative real-time PCR. In immunohistochemical study, bFGF was positively stained on the fibroblasts within hypertrophic LF compared to nonpathologic LF of controls. Subsequent ELISA analysis revealed that bFGF concentration in the hypertrophic LF group was remarkably higher than that in the control group (P = 0.003). The thickness of LF in the hypertrophic LF was significantly greater than that in the control group (P < 0.001). LSCS patients with greater severity of LF hypertrophy had significantly higher bFGF levels in the LF tissues (P < 0.001). Furthermore, the bFGF concentration exhibited a positive correlation with the LF thickness (r = 0.974, P < 0.001).

Conclusions

These findings suggest that the increased expression of bFGF is associated with the hypertrophy of ligamentum flavum in patients with LSCS.

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Acknowledgments

This investigation was supported by Ratchadapiseksompotch Fund, Faculty of Medicine, Chulalongkorn University, Thailand Research Fund, and National Research Council of Thailand. We are grateful to Mr. Preecha Ruangvejvorachai for kindly technical assistance and Chulalongkorn Medical Research Center (ChulaMRC) for generously providing facilities.

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Correspondence to Sittisak Honsawek.

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Honsawek, S., Poonpukdee, J., Chalermpanpipat, C. et al. Hypertrophy of the ligamentum flavum in lumbar spinal canal stenosis is associated with increased bFGF expression. International Orthopaedics (SICOT) 37, 1387–1392 (2013). https://doi.org/10.1007/s00264-013-1864-y

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  • DOI: https://doi.org/10.1007/s00264-013-1864-y

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