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. 1997 Oct;92(2):267–273. doi: 10.1046/j.1365-2567.1997.00335.x

Tosylphenylalanine chloromethyl ketone inhibits TNF-alpha mRNA synthesis in the presence of activated NF-kappa B in RAW 264.7 macrophages.

J Y Jeong 1, K U Kim 1, D M Jue 1
PMCID: PMC1364068  PMID: 9415036

Abstract

Serine proteinase inhibitors such as N-tosyl-L-phenylalanine chloromethyl ketone (TPCK) and N alpha-p-tosyl-L-lysine chloromethyl ketone (TLCK) were shown to inhibit production of tumour necrosis factor-alpha (TNF-alpha) in lipopolysaccharide (LPS)-activated RAW 264.7 macrophages. The proteinase inhibitors were also reported to inhibit activation of the transcription factor nuclear factor-kappa B (NF-kappa B) by blocking the signalling pathway for stimuli-induced phosphorylation of the inhibitory subunit (I kappa B alpha) and thus preventing its degradation. In RAW 264.7 cells TPCK and TLCK significantly suppressed LPS-induced increase in TNF-alpha mRNA, induction of nuclear kappa B-binding activity and degradation of I kappa B alpha. TPCK and TLCK effectively blocked TNF-alpha mRNA synthesis even when they were added after LPS stimulation. In these cells, however, the inhibitory modes of the two inhibitors were found to be different: while addition of TLCK suppressed I kappa B alpha degradation and reduced NF-kappa B activity, a comparable decrease in the nuclear kappa B-binding activity or in I kappa B alpha degradation was not observed in cells treated with TPCK. Our results show that TPCK inhibits LPS-induced TNF-alpha mRNA synthesis in the presence of activated NF-kappa B and suggests that mechanisms other than NF-kappa B activation are involved in the transcriptional regulation of the TNF-alpha gene.

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