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- W2122040229 abstract "Introduction Earlier work has suggested that the p38 MAPK, JNK1/2, and ERK1/2 signal pathway existed in nucleus pulposus cells and the cell growth, differentiation, and apoptosis were regulated by them. Because osmotic fluctuations are inevitable in the physicochemical environment of intervertebral disc cells, high osmolality could activate p38 MAPK, JNK1/2, and ERK1/2 signal pathway. The effects of high osmolality on the catabolic program and proliferation of nucleus pulposus cells are still not clear. Materials and Methods Rabbit nucleus pulposus cells were cultured and divided into different group at random. The cells were pretreated with inhibitor for p38 MAPK, JNK1/2, and ERK1/2 signal pathway, respectively. In next step, the cells were cultured in different osmolality environment for different time at 37°C in 5% carbon dioxide incubator. After treatments, ratio of apoptosis was measured by flow cytometry, and Western blotting was performed to quantify the expression of the activated forms of p38 MAPK, JNK1/2, and ERK1/2. Furthermore, immunofluorescence analysis with confocal microscopy was performed to confirm the hyperosmolality effects on activation of p38 MAPK, JNK1/2, and ERK1/2 signal pathways in nucleus pulposus cells. Results Our results show that in 500 and 600 mOsm/kg medium, rabbit nucleus pulposus cell apoptosis increased, and a persistent phosphorylation of p38 MAPK, JNK1/2, and ERK1/2 proteins were observed. In the same condition, the apoptotic cells death remarkably decreased when the p38 MAPK and JNK1/2 signal pathways were blocked by their inhibitors SB203580 and SP600125, respectively. On the other side, the apoptotic cells death rate reraised greatly when the ERK1/2 signal pathways were blocked by its inhibitor PD98059. Conclusion High osmolality activated p38MAPK, JNK1/2, and ERK1/2 in rabbit nucleus pulposus cell, and the activated p38 MAPK and JNK1/2 induced cell apoptosis, on the contrary, the activated ERK1/2 made the cell survived. Disclosure of Interest None declared References Freemont AJ. The cellular pathobiology of the degenerate intervertebral disc and discogenic back pain. Rheumatology (Oxford) 2009;48(1):5–10 Urban JP, McMullin JF. Swelling pressure of the inervertebral disc: influence of proteoglycan and collagen contents. Biorheology 1985;22(2):145–157 Wilke HJ, Neef P, Caimi M, Hoogland T, Claes LE. New in vivo measurements of pressures in the intervertebral disc in daily life. Spine 1999;24(8):755–762 Takeno K, Kobayashi S, Negoro K, et al. Physical limitations to tissue engineering of intervertebral disc cells: effect of extracellular osmotic change on glycosaminoglycan production and cell metabolism. Laboratory investigation. 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- W2122040229 title "The Roles of MAPKs in Rabbit Nucleus Pulposus Cell Apoptosis Induced by High Osmolality" @default.
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