Lipopolysaccharide induces expression of tumour necrosis factor alpha in rat brain: inhibition by methylprednisolone and by rolipram

British Journal of Pharmacology
M ButtiniH W Boddeke

Abstract

1. We have investigated the effects of the phosphodiesterase (PDE) type IV inhibitor rolipram and of the glucocorticoid methylprednisolone on the induction of tumour necrosis factor alpha (TNF-alpha) mRNA and protein in brains of rats after peripheral administration of lipopolysaccharide (LPS). 2. After intravenous administration of LPS, a similar time-dependent induction of both TNF-alpha mRNA and protein was observed in rat brain. Peak mRNA and protein levels were found 7 h after administration of LPS. 3. In situ hybridization experiments with a specific antisense TNF-alpha riboprobe suggested that the cells responsible for TNF-alpha production in the brain were microglia. 4. Intraperitoneal administration of methylprednisolone inhibited the induction of TNF-alpha protein in a dose-dependent manner. A maximal inhibition of TNF-alpha protein production by 42.9+/-10.2% was observed at a dose regimen consisting of two injections of each 30 mg kg(-1) methylprednisolone. 5. Intraperitoneal administration of rolipram also inhibited the induction of TNF-alpha protein in a dose-dependent manner. The maximal inhibition of TNF-alpha protein production was 96.1+/-12.2% and was observed at a dose regimen of three separate injections of e...Continue Reading

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