Regulation of neutrophil-mediated killing of Staphylococcus aureus and chemotaxis by c-jun NH2 terminal kinase

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2010

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Yeh, M.
Mukaro, V.
Hii, C.
Ferrante, A.

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Journal article

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Journal of Leukocyte Biology, 2010; 87(5):925-932

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Mei-Chun Yeh, Violet Mukaro, Charles S. Hii and Antonio Ferrante

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Abstract

The role of JNK in neutrophil chemotaxis and killing of microbial pathogens remains unclear. Using a recently described cell-permeable peptide inhibitor of the JNK pathway, based on the JBD of JIP-1, coupled to the protein transduction domain of HIV-TAT (TAT-JIP), in association with control peptides, we demonstrate that the JNK pathway plays a major role in regulating human neutrophil chemotaxis and killing of microbial pathogens. Serum-opsonized Staphylococcus aureus elicited JNK activation and c-jun phosphorylation. The activation of the JNK pathway and bactericidal activity were inhibited by the TAT-JIP peptide. The stimulation of oxygen radical generation by S. aureus was dependent on the JNK signaling pathway, as was the phagocytosis of serum-opsonized bacteria. Chemotaxis to activated serum complement but not random migration was inhibited by the TAT-JIP peptide. The findings demonstrate a major role for the JNK signaling pathway in neutrophil-mediated defense against microbial pathogens.

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© Society for Leukocyte Biology

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