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- W2020444370 abstract "Numerous studies indicate that proinflammatory substances like tumor necrosis factor alpha (TNF-alpha) and interferon gamma (IFN-gamma) as well as macrophage-derived neopterin are increased in atherosclerotic tissue and thus are potentially involved in the process of atherogenesis. Since apoptotic death of vascular smooth muscle cells (VSMC) is reported to occur in atherosclerotic lesions, we investigated the effects of neopterin, TNF-alpha, and IFN-gamma on apoptosis in cultured VSMC. Morphological changes characteristic of apoptosis as well as DNA fragmentation were detected in cells treated with neopterin, TNF-alpha/IFN-gamma, and neopterin + TNF-alpha/IFN-gamma. Simultaneously, neopterin, TNF-alpha/IFN-gamma, and neopterin + TNF-alpha/IFN-gamma led to inducible nitric oxide synthase (iNOS) gene expression and nitric oxide (NO) synthesis. NO generation was significantly reduced when cells were cotreated with the competitive iNOS inhibitor aminoguanidine. This was accompanied by decreased percentual apoptosis as detected by FACS analysis using all kinds of stimuli. We conclude that neopterin as well as TNF-alpha/IFN-gamma are potent mediators of apoptotic death in VSMC which is at least in part triggered by NO synthesis induced by these proinflammatory mediators." @default.
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- W2020444370 date "1998-07-01" @default.
- W2020444370 modified "2023-09-27" @default.
- W2020444370 title "Neopterin Induces Nitric Oxide-Dependent Apoptosis in Rat Vascular Smooth Muscle Cells" @default.
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- W2020444370 doi "https://doi.org/10.1016/s0171-2985(98)80064-8" @default.
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