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- W1572247882 abstract "Mycoplasma fermentans-derived membrane lipoproteins (LAMPf) have been demonstrated to stimulate monocytic cells and to induce the secretion of proinflammatory cytokines by a mechanism involving the triggering of protein tyrosine kinase and mitogen-activated protein kinase cascades. Herein, we have examined the effects of LAMPf on the activation of a series of transcription factors potentially involved in cytokine gene expression. LAMPf was capable of inducing NF-kappa B, activated protein 1 (AP-1), and c-fos activation in macrophages and of stimulating NF-kappa B and AP-1 transactivation. Furthermore, we have delineated the contribution of each mitogen-activated protein kinase pathway to the LAMPf-mediated activation of AP-1, c-fos, and NF-kappa B. Whereas the selective extracellular signal-regulated kinase pathway inhibitor PD-98059 did not affect the LAMPf-mediated transactivation of AP-1, c-fos, or NF-kappa B, the specific p38 inhibitor SB203580 abrogated this activity. A c-Jun N-terminal kinase-dominant negative was shown to block the activation of AP-1 without altering NF-kappa B or c-fos activation by LAMPf. In addition, D609, a selective inhibitor of phosphatidylcholine-specific phospholipase C, was shown to block both translocation and transactivation of either NF-kappa B or AP-1 in response to LAMPf. Although LAMPf-mediated macrophage activation is CD14 independent, we could not distinguish between the intracellular mechanisms leading to the macrophage activation triggered by either LPS or LAMPf. This suggests that macrophages display a common signaling machinery leading to the secretion of proinflammatory cytokines in response to different bacterial products. The comprehension of these mechanisms may help to better understanding the bacterial pathogenesis and to elucidate general mechanisms of macrophage activation leading to cytokine secretion." @default.
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- W1572247882 date "1999-02-15" @default.
- W1572247882 modified "2023-10-17" @default.
- W1572247882 title "Signal transduction pathways involved in the activation of NF-kappa B, AP-1, and c-fos by Mycoplasma fermentans membrane lipoproteins in macrophages." @default.
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