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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 FEBS+Lett 2009 ; 583 (12): 1933-8 Nephropedia Template TP
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p38 mitogen-activated protein kinase inhibits tristetraprolin-directed decay of the mRNA of the anti-inflammatory cytokine interleukin-10 #MMPMID19416727
Tudor C; Hitti E; Rawlinson L; Blackshear PJ; Gaestel M; Clark AR; Saklatvala J; Dean JL
FEBS Lett 2009[Jun]; 583 (12): 1933-8 PMID19416727show ga
p38 mitogen-activated protein kinase (MAPK) stabilises mRNAs of pro-inflammatory mediators by inhibiting AU-rich element-mediated decay. We show that in bone marrow-derived macrophages (BMDM) tumour necrosis factor (TNF) mRNA is stabilised by inactivation of the AU-rich element-binding protein tristetraprolin (TTP) by the p38 MAPK pathway. We show that this mechanism is not limited to TNF mRNA and that p38 MAPK also inhibits TTP-directed decay of interleukin (IL)-10 mRNA. Lipopolysaccharide-induced IL-10 mRNA and protein expression was increased in TTP?/? compared with wild-type BMDM. We also provide evidence that TTP directly targets IL-10 mRNA by binding to its 3?-untranslated region. We found that p38 MAPK activation also prevents TTP-directed decay of cyclooxygenase-2, IL-6, and IL-1? mRNAs. However, despite destabilisation of IL-6 mRNA by TTP, IL-6 mRNA and protein expression was reduced in TTP?/? BMDM and IL-12p40 mRNA and protein expression was also reduced in TTP?/? BMDM. Neutralisation of IL-10 in lipopolysaccharide-treated BMDM with an anti-IL-10 antibody rescued the inhibition of IL-6 and IL-12p40 protein in TTP?/? cells. Thus the p38 MAPK pathway acting in conjunction with TTP regulates the stability and expression of not only pro-inflammatory mRNAs but also the mRNA of the anti-inflammatory cytokine, IL-10.