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- W2023867071 abstract "We investigated the effect of rapamycin, a specific inhibitor of the mammalian serine/threonine kinase, mammalian target of rapamycin (mTOR), on the expression of inducible nitric oxide synthase (iNOS) in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells. Pretreatment of cells with rapamycin significantly inhibited LPS-induced nitrite production and the expression of iNOS protein in a dose-dependent manner. However, LPS-induced mRNA expression of iNOS and its concomitant activation of nuclear factor (NF)-κB remained unchanged by rapamycin. Intriguingly, LPS-induced nitrite production and iNOS protein expression were partially blocked at nanomolar concentrations of rapamycin, whereas phosphorylation of both p70 S6 kinase and 4E-BP1 was completely abolished. The suppression of LPS-induced iNOS expression by rapamycin was reversed by the protease inhibitor lactacystin. Furthermore, rapamycin treatment stimulated 20S proteasome activity, which was slightly elevated by LPS. Taken together, our findings strongly suggest that rapamycin down-regulates LPS-induced iNOS protein expression via proteasomal activation, as well as through inhibition of the mTOR signaling pathway." @default.
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- W2023867071 date "2009-01-01" @default.
- W2023867071 modified "2023-10-16" @default.
- W2023867071 title "Rapamycin Down-Regulates Inducible Nitric Oxide Synthase by Inducing Proteasomal Degradation" @default.
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- W2023867071 doi "https://doi.org/10.1248/bpb.32.988" @default.
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