1. Dagenais S, Caro J, Haldeman S. A systematic review of low back pain cost of illness studies in the United States and internationally. Spine J 2008 8:8–20. PMID:
18164449.
2. Sakai D. Future perspectives of cell-based therapy for intervertebral disc disease. Eur Spine J 2008 17(Suppl 4): 452–458. PMID:
19005704.
3. Bibby SR, Jones DA, Lee RB, Yu J, Urban JP. The pathophysiology of the intervertebral disc. Joint Bone Spine 2001 68:537–542. PMID:
11808995.
4. Zhao CQ, Wang LM, Jiang LS, Dai LY. The cell biology of intervertebral disc aging and degeneration. Ageing Res Rev 2007 6:247–261. PMID:
17870673.
5. Meisel HJ, Siodla V, Ganey T, Minkus Y, Hutton WC, Alasevic OJ. Clinical experience in cell-based therapeutics: disc chondrocyte transplantation A treatment for degenerated or damaged intervertebral disc. Biomol Eng 2007 24:5–21. PMID:
16963315.
6. Zeng Y, Danielson KG, Albert TJ, Shapiro IM, Risbud MV. HIF-1 alpha is a regulator of galectin-3 expression in the intervertebral disc. J Bone Miner Res 2007 22:1851–1861. PMID:
17592963.
7. Jünger S, Gantenbein-Ritter B, Lezuo P, Alini M, Ferguson SJ, Ito K. Effect of limited nutrition on in situ intervertebral disc cells under simulated-physiological loading. Spine (Phila Pa 1976) 2009 34:1264–1271. PMID:
19455001.
8. Wang DL, Jiang SD, Dai LY. Biologic response of the intervertebral disc to static and dynamic compression in vitro. Spine (Phila Pa 1976) 2007 32:2521–2528. PMID:
17978649.
9. Zhao CQ, Jiang LS, Dai LY. Programmed cell death in intervertebral disc degeneration. Apoptosis 2006 11:2079–2088. PMID:
17051327.
10. Roberts S, Evans EH, Kletsas D, Jaffray DC, Eisenstein SM. Senescence in human intervertebral discs. Eur Spine J 2006 15(Suppl 3): S312–S316. PMID:
16773379.
11. Hoyland JA, Le Maitre C, Freemont AJ. Investigation of the role of IL-1 and TNF in matrix degradation in the intervertebral disc. Rheumatology (Oxford) 2008 47:809–814. PMID:
18397957.
12. Wako M, Haro H, Ando T, et al. Novel function of TWEAK in inducing intervertebral disc degeneration. J Orthop Res 2007 25:1438–1446. PMID:
17568422.
13. Sowa G, Vadalà G, Studer R, et al. Characterization of intervertebral disc aging: longitudinal analysis of a rabbit model by magnetic resonance imaging, histology, and gene expression. Spine (Phila Pa 1976) 2008 33:1821–1828. PMID:
18670334.
14. Tolonen J, Grönblad M, Vanharanta H, et al. Growth factor expression in degenerated intervertebral disc tissue: an immunohistochemical analysis of transforming growth factor beta, fibroblast growth factor and platelet-derived growth factor. Eur Spine J 2006 15:588–596. PMID:
15980999.
15. Cheng CC, Uchiyama Y, Hiyama A, Gajghate S, Shapiro IM, Risbud MV. PI3K/AKT regulates aggrecan gene expression by modulating Sox9 expression and activity in nucleus pulposus cells of the intervertebral disc. J Cell Physiol 2009 221:668–676. PMID:
19711351.
16. Gruber HE, Stasky AA, Hanley EN Jr. Characterization and phenotypic stability of human disc cells in vitro. Matrix Biol 1997 16:285–288. PMID:
9501328.
17. Gruber HE, Hanley EN Jr. Human disc cells in monolayer vs 3D culture: cell shape, division and matrix formation. BMC Musculoskelet Disord 2000 1:1PMID:
11231882.
18. Kluba T, Niemeyer T, Gaissmaier C, Gründer T. Human anulus fibrosis and nucleus pulposus cells of the intervertebral disc: effect of degeneration and culture system on cell phenotype. Spine (Phila Pa 1976) 2005 30:2743–2748. PMID:
16371897.
19. Preradovic A, Kleinpeter G, Feichtinger H, Balaun E, Krugluger W. Quantitation of collagen I, collagen II and aggrecan mRNA and expression of the corresponding proteins in human nucleus pulposus cells in monolayer cultures. Cell Tissue Res 2005 321:459–464. PMID:
16001263.
20. Pfirrmann CW, Metzdorf A, Zanetti M, Hodler J, Boos N. Magnetic resonance classification of lumbar intervertebral disc degeneration. Spine (Phila Pa 1976) 2001 26:1873–1878. PMID:
11568697.
21. Moon SH, Nishida K, Gilbertson LG, et al. Biologic response of human intervertebral disc cells to gene therapy cocktail. Spine (Phila Pa 1976) 2008 33:1850–1855. PMID:
18622355.
22. Wei A, Brisby H, Chung SA, Diwan AD. Bone morphogenetic protein-7 protects human intervertebral disc cells in vitro from apoptosis. Spine J 2008 8:466–474. PMID:
18082466.
23. Yang SH, Wu CC, Shih TT, Chen PQ, Lin FH. Three-dimensional culture of human nucleus pulposus cells in fibrin clot: comparisons on cellular proliferation and matrix synthesis with cells in alginate. Artif Organs 2008 32:70–73. PMID:
18181806.
24. Le Maitre CL, Freemont AJ, Hoyland JA. Accelerated cellular senescence in degenerate intervertebral discs: a possible role in the pathogenesis of intervertebral disc degeneration. Arthritis Res Ther 2007 9:R45PMID:
17498290.
25. Kim KW, Chung HN, Ha KY, Lee JS, Kim YY. Senescence mechanisms of nucleus pulposus chondrocytes in human intervertebral discs. Spine J 2009 9:658–666. PMID:
19540815.