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  • Showing results for Characterization[Title] AND early[Title] AND events[Title] AND involved[Title] AND human[Title] AND dendritic[Title] AND cell[Title] AND maturation[Title] AND induced[Title] AND sensitizers[Title] AND cross[Title] AND talk[Title] AND MAPK[Title] AND signalling[Title]. Your search for Characterization of early events involved in human dendritic cell maturation induced by sensitizers: cross talk between MAPK signalling pathwa retrieved no results.
Toxicol Appl Pharmacol. 2008 Aug 1;230(3):397-406. doi: 10.1016/j.taap.2008.03.012. Epub 2008 Apr 8.

Characterization of early events involved in human dendritic cell maturation induced by sensitizers: cross talk between MAPK signalling pathways.

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1
EA 41-69, Université Lyon 1, Pavillon R, Hopital Edouard Herriot, Lyon, France.

Abstract

Dendritic cells (DCs), efficient-antigen presenting cells play an important role in initiating and regulating immune responses. DC maturation following exposure to nickel or DNCB induced an up-regulation of phenotypic markers and inflammatory cytokine secretion. Early intracellular mechanisms involved in DC maturation required to be precise. To address this purpose, DCs derived from human monocytes were treated with sensitizers (nickel, DNCB or thimerosal) in comparison with an irritant (SDS). Our data confirming the up-regulation of CD86, CD54 and cytokine secretion (IL-8 and TNFalpha) induced by sensitizers but not by SDS, signalling transduction involved in DC maturation was investigated using these chemicals. Kinase activity measurement was assessed using two new sensitive procedures (Facetrade mark and CBA) requiring few cells. SDS did not induce changes in signalling pathways whereas NiSO(4), DNCB and thimerosal markedly activated p38 MAPK and JNK, in contrast Erk1/2 phosphorylation was completely inhibited by DNCB or thimerosal and only activated by nickel. A pre-treatment with p38 MAPK inhibitor (SB203580) suppressed Erk1/2 inhibition induced by DNCB or thimerosal demonstrating a direct interaction between p38 MAPK and Erk1/2. A pre-treatment with an antioxidant, N-acetyl-L-cysteine (NAC) markedly reduced Erk1/2 inhibition and p38 MAPK phosphorylation induced by DNCB and thimerosal, suggesting a direct activation of p38 MAPK via an oxidative stress and a regulation of MAPK signalling pathways depending on chemicals. Because of a high sensitivity of kinase activity measurements, these procedures will be suitable for weak or moderate sensitizer screening.

PMID:
18495191
DOI:
10.1016/j.taap.2008.03.012
[Indexed for MEDLINE]

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