Salmonella typhimurium and lipopolysaccharide stimulate extracellularly regulated kinase activation in macrophages by a mechanism involving phosphatidylinositol 3-kinase and phospholipase D as novel intermediates
Kj. Procyk et al., Salmonella typhimurium and lipopolysaccharide stimulate extracellularly regulated kinase activation in macrophages by a mechanism involving phosphatidylinositol 3-kinase and phospholipase D as novel intermediates, INFEC IMMUN, 67(3), 1999, pp. 1011-1017
Activation of the extracellularly regulated kinase (ERK) pathway is part of
the early biochemical events that follow lipopolysaccharide (LPS) treatmen
t of macrophages or their infection by virulent and attenuated Salmonella s
trains. Phagocytosis as well as the secretion of invasion-associated protei
ns is dispensable for ERK activation by the pathogen. Furthermore, the path
ways used by Salmonella and LPS to stimulate ERK are identical, suggesting
that kinase activation might be solely mediated by LPS. Both stimuli activa
te ERK by a mechanism involving herbimycin-dependent tyrosine kinase(s) and
phosphatidylinositol 3-kinase. Phospholipase D activation and stimulation
of protein kinase C appear to be intermediates in this novel pathway of MEK
/ERK activation.