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Targeting of iNOS with antisense DNA plasmid reduces cytokine-induced inhibition of osteoblastic activity. | LitMetric

AI Article Synopsis

Article Abstract

Proinflammatry cytokines, tumor necrosis factor-alpha combined with interleukin-1beta, induce excessive production of nitric oxide (NO) and its cytotoxic metabolite peroxynitrite (ONOO-) via inducible nitric oxide synthase (iNOS) in murine osteoblasts. In this study, to properly estimate the effects of antisense DNA of iNOS on osteoblastic activity, we produced transformed cell lines with antisense plasmid that specifically targets the iNOS gene for potential long-lasting inhibition. Transformed antisense cell lines were identified by 1) the detection of antisense transcripts, 2) the attenuated expression of iNOS protein, 3) the reduction of NO synthase activity, and 4) the level of NO production. These cell lines targeting iNOS, which showed decreased production of both NO and ONOO-, prevented the inhibition of osteoblastic differentiation as was assayed by the mRNA expression of type I collagen, alkaline phosphatase, osteocalcin, and Core binding factor in the presence of proinflammatory cytokines. Present results indicate that the antisense DNA plasmid of iNOS is potent to reduce the cytokine-induced inhibition of osteoblastic activity.

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http://dx.doi.org/10.1152/ajpendo.00267.2002DOI Listing

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