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* Department of Internal Medicine/Infectious Diseases, Charité-Universitätsmedizin, Berlin, Germany; and
Institute for Medical Microbiology, Justus-Liebig University, Giessen, Germany
Nucleotide-binding oligomerization domain (Nod) proteins serve as intracellular pattern recognition molecules recognizing peptidoglycans. To further examine intracellular immune recognition, we used Listeria monocytogenes as an organism particularly amenable for studying innate immunity to intracellular pathogens. In contrast to wild-type L. monocytogenes, the nonpathogenic Listeria innocua, or L. monocytogenes mutants lacking internalin B or listeriolysin O, poorly invaded host cells and escaped into host cell cytoplasm, respectively, and were therefore used as controls. In this study, we show that only the invasive wild-type L. monocytogenes, but not the listeriolysin O- or internalin B-negative L. monocytogenes mutants or L. innocua, substantially induced IL-8 production in HUVEC. RNA interference and Nod1-overexpression experiments demonstrated that Nod1 is critically involved in chemokine secretion and NF-
B activation initiated by L. monocytogenes in human endothelial cells. Moreover, we show for the first time that Nod1 mediated activation of p38 MAPK signaling induced by L. monocytogenes. Finally, L. monocytogenes- and Nod1-induced IL-8 production was blocked by a specific p38 inhibitor. In conclusion, L. monocytogenes induced a Nod1-dependent activation of p38 MAPK signaling and NF-B which resulted in IL-8 production in endothelial cells. Thus, Nod1 is an important component of a cytoplasmic surveillance pathway.
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