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Pubmed ID :14499342
Publication Date : //

MAPK-activated protein kinase-2 participates in p38 MAPK-dependent and ERK-dependent functions in human neutrophils.


Many neutrophil responses, including chemotaxis, exocytosis, respiratory burst activity and chemokine synthesis, are mediated by p38 MAPK. MAPK-activated protein kinase-2 (MK2) is activated by p38 MAPK in human neutrophils. The present study tested the hypothesis that MK2 mediates multiple p38 MAPK-dependent responses in human neutrophils by comparing the effect of the p38 MAPK inhibitor, SB203580, with an MK2 inhibitory peptide. Both SB203580 and MK2 inhibitory peptide attenuated respiratory burst activity, exocytosis, and chemotaxis. Lipopolysaccharide (LPS)-induced IL-8 production was inhibited by SB203580, but not by the MK2 inhibitory peptide. Inhibition of chemotaxis and respiratory burst activity by SB203580 was less than that of MK2 inhibitory peptide. Inhibition of extracellular signal-regulated kinase (ERK) activity by PD98059 attenuated superoxide release and chemotaxis, and simultaneous treatment with SB203580 and PD98059 demonstrated additive inhibition. ERK phosphorylated MK2 in vitro and activated MK2 in f-methionyl-leucyl-phenylalanine (FMLP)-stimulated neutrophils. These data suggest that MK2 mediates both ERK- and p38 MAPK-dependent neutrophil responses.

Authors : Coxon Patricia Y , Rane Madhavi J , Uriarte Silvia , Powell David W , Singh Saurabh , Butt Waseem , Chen Qingdan , McLeish Kenneth R ,

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