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• W2077253732 abstract "Study Design: An in vitro experiment. Objectives: To evaluate the mRNA expressions of matrix components, and analyze the cellular proliferation and proteoglycan synthesis of human intervertebral disc cells in response to dexamethasone and TGF-β1 Summary of Literature Review: Corticosteroids are responsible for the regulation of a diverse range of biological processes through modulation of the expression of target genes. The direct injection of methylprednisolone to the intervertebral disc (IVD) has been shown to cause degeneration and calcification of the disc in rabbits. Systemic administration of hydrocortisone induced degeneration of notochordal cells, which accelerated the aging process of the disc in mice. Transforming growth factor beta-1 (TGF-β1) is known as a potent agent for the proliferation, differentiation and matrix synthesis of IVD. Materials and Methods : IVD cells were isolated from ten patients, and subsequently cultured. Various doses of dexamethasone (DEX) and/or TGF-β1 were administered to the IVD cultures. DNA and proteoglycan syntheses were measured by the incorporation of [3H]-thymidine and [35S]-sulfate, respectively. RT-PCRs were performed for the expressions of aggrecan, collagen types I and II, and osteocalcin mRNA. R e s u l t s: Cultures with DEX showed increased cellular proliferation and decreased proteoglycan synthesis (p<0.05). TGF-β1 potentiated the proliferative effect of DEX, but failed to stimulate proteoglycan synthesis in the cultures containing DEX. There were no recognizable changes in the mRNA expressions of aggrecan, collagen types I and II, and osteocalcin in response to DEX and TGF-β1. Conclusions: DEX demonstrated a proliferative effect on human IVD cells, with the combination of DEX and TGF-β1 showing potentiation of the proliferative effect, while at high doses(100 and 1000nM, the DEX was shown to down-regulate the proteoglycan synthesis. Caution should be exercised in the use of corticosteroid in the therapeutic approaches for the treatment of disc disease or in the regenerative matrix of the IVD." @default.
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• W2077253732 date "2005-01-01" @default.
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• W2077253732 title "Phenotypical Stability and Matrix Synthesis of Human Intervertebral Disc Cells in Response to Dexamethasone and Transforming Growth Factor-β1" @default.
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• W2077253732 doi "https://doi.org/10.4184/jkss.2005.12.2.91" @default.
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