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- W2113128903 abstract "Bone morphogenetic protein-2 (BMP-2)-mediated stimulation of articular cartilage proteoglycan (PG) synthesis is suppressed in arthritic murine knee joints and by interleukin-1 (IL-1). The goal of this study was to investigate whether the gaseous mediator nitric oxide (NO) plays a crucial role in the inhibition of BMP-2 effects by IL-1.Bone morphogenetic protein-2 alone or in combination with IL-1 was injected into the right knee joint of wild-type and NOS2 deficient C57BI/6x129/Sv mice. Proteoglycan synthesis was measured ex vivo by incorporation of 35S-sulfate on day 1, 2 and 3 after injection. To study the role of NO in the inhibition BMP-2-mediated stimulation of PG synthesis in arthritic joints, BMP-2 was injected intra-articularly in the joints of wild-type and NOS2 deficient mice with zymosan-induced arthritis. To check for NOS2 deficiency, NO production was measured in conditioned medium after challenge of patellae with surrounding tissue with IL-1.BMP-2 potently stimulated proteoglycan synthesis in articular cartilage of normal knees (up to 4-fold) but not in arthritic knees. Co-injection of BMP-2 with tumor necrosis factor alpha had no effect on BMP-2-mediated stimulation of PG synthesis but co-injection with IL-1 alpha resulted in a nearly total inhibition of BMP-2-mediated stimulation. In contrast, in NOS2 deficient mice IL-1 had no effect on BMP-2-mediated stimulation of PG synthesis. However, injection of BMP-2 into arthritic knee joints of NOS2 knock out mice did not result in significant stimulation of PG synthesis.In this study we show that NO plays a role in the inhibition of BMP-2-mediated stimulation of PG synthesis by IL-1. However, NO, or at least NOS2, plays no dominant role in the inhibition of BMP-2 effects in arthritic knee joints." @default.
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- W2113128903 title "Role of nitric oxide in the inhibition of BMP-2-mediated stimulation of proteoglycan synthesis in articular cartilage" @default.
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- W2113128903 doi "https://doi.org/10.1053/joca.1999.0275" @default.
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