Expression and function of FGF9 in the hypertrophied ligamentum flavum of lumbar spinal stenosis patients.
BACKGROUND CONTEXT
Ligamentum flavum (LF) hypertrophy plays a dominant role in lumbar spinal stenosis (LSS). A previous study found that fibroblast growth factor 9 (FGF9) was upregulated with mechanical stress in rabbit LF. However, the expression and function of FGF9 are not well understood in human LF.


PURPOSE
To evaluate FGF9 expression and function in human LF with and without hypertrophy.


STUDY DESIGN
This study employed a basic research study design utilizing human LF tissue for histological analyses.


PATIENT SAMPLES
Hypertrophied LF tissue sample from patients with LSS, and nonhypertrophied (control) LFs from patients with lumbar disc herniation or other diseases were obtained during surgery.


METHODS
LF specimens were histologically analyzed for FGF9 and vascular endothelial growth factor A (VEGF-A) by immunohistochemistry. The number of total and FGF9 immuno-positive cells and blood vessels were counted and compared between LF with and without hypertrophy. For functional analysis, the effect of FGF9 on cell proliferation and migration was examined using a primary cell culture of human LF.


RESULTS
Histological studies revealed that the total cell number was significantly higher in the LF of patients with LSS than in the LF of control patients. Immunohistochemistry showed that the percentage of FGF9-positive cells was significantly higher in the LF of patients with LSS than in the controls, and it positively correlated with patients' age, regardless of disease. Double immune-positive cells for FGF9 and VEGF-A were often observed in vascular endothelial cells and fibroblasts in the fibrotic area of hypertrophied LF, and the number of double positive vessels was significantly higher in LF of LSS patients than in the LF of controls. Primary cell culture of human LF revealed that FGF9 promoted the proliferation and migration of LF cells.


CONCLUSION
The present study demonstrated that FGF9 expression is highly upregulated in hypertrophied human LF. FGF9 potentially plays a pivotal role in the process of hypertrophy of LF, which is associated with mechanical stress, through cell proliferation and migration.


CLINICAL SIGNIFICANCE
The results from this study partially reveal the molecular mechanisms of LF hypertrophy and suggest that FGF9 may be involved in the process of LF degeneration in elderly patients.
['Habibi|Hasibullah|H|', 'Suzuki|Akinobu|A|', 'Hayashi|Kazunori|K|', 'Salimi|Hamidullah|H|', 'Terai|Hidetomi|H|', 'Hori|Yusuke|Y|', 'Tamai|Koji|K|', 'Orita|Kumi|K|', 'Ohyama|Shoichiro|S|', 'Yabu|Akito|A|', 'Maruf|Mohammad Hasib|MH|', 'Nakamura|Hiroaki|H|']
D000368:Aged D000818:Animals D042783:Endothelial Cells D051525:Fibroblast Growth Factor 9 D006801:Humans D006984:Hypertrophy D017843:Ligamentum Flavum D008159:Lumbar Vertebrae D011817:Rabbits D013130:Spinal Stenosis D042461:Vascular Endothelial Growth Factor A
Hypertrophy Lumbar spinal stenosis Fibroblast growth factor 9 Mechanical stress Vascular endothelial growth factor A Cell proliferation Cell migration Ligament flavum