scholarly journals Interleukin-8 Secretion from Mycobacterium tuberculosis-Infected Monocytes Is Regulated by Protein Tyrosine Kinases but Not by ERK1/2 or p38 Mitogen-Activated Protein Kinases

2002 ◽  
Vol 70 (8) ◽  
pp. 4743-4746 ◽  
Author(s):  
Clara Ameixa ◽  
Jon S. Friedland
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Protein Kinases ◽  
Tyrosine Kinases ◽  
Nuclear Translocation ◽  
Interleukin 8 ◽  
Protein Tyrosine Kinases ◽  
Human Monocytes ◽  
Mitogen Activated Protein Kinases ◽  
Mitogen Activated Protein ◽  
Posttranscriptional Processing

ABSTRACT Mycobacterium tuberculosis upregulates NF-κB binding and interleukin-8 (IL-8) gene expression and secretion in primary human monocytes. Inhibition of tyrosine protein kinases but not of ERK1/2 or p38 mitogen-activated protein kinases downregulates tuberculosis-induced IL-8 secretion. The inhibitor genistein decreased NF-κB nuclear translocation and IL-8 gene transcription in addition to acting on posttranscriptional processing.

scholarly journals Phosphorylation of Mitogen-Activated Protein Kinases Contributes to Interferon γ Production in Response to Mycobacterium tuberculosis

2012 ◽  
Vol 207 (2) ◽  
pp. 340-350 ◽  
Author(s):  
Virginia Pasquinelli ◽  
Ana I. Rovetta ◽  
Ivana B. Alvarez ◽  
Javier O. Jurado ◽  
Rosa M. Musella ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Protein Kinases ◽  
Interferon Γ ◽  
Mitogen Activated Protein Kinases ◽  
Mitogen Activated Protein

scholarly journals Bacteroides fragilis Enterotoxin Induces Intestinal Epithelial Cell Secretion of Interleukin-8 through Mitogen-Activated Protein Kinases and a Tyrosine Kinase-Regulated Nuclear Factor-κB Pathway

2004 ◽  
Vol 72 (10) ◽  
pp. 5832-5839 ◽  
Author(s):  
Shaoguang Wu ◽  
Jan Powell ◽  
Nes Mathioudakis ◽  
Sheryl Kane ◽  
Ellen Fernandez ◽  
...  
Keyword(s):  
Tyrosine Kinase ◽  
Protein Kinases ◽  
Bacteroides Fragilis ◽  
Nuclear Factor Κb ◽  
Interleukin 8 ◽  
Biologically Active ◽  
Nuclear Factor ◽  
Intestinal Epithelial ◽  
Mitogen Activated Protein Kinases ◽  
Mitogen Activated Protein

ABSTRACT Enterotoxigenic Bacteroides fragilis (ETBF) secretes a 20-kDa metalloprotease toxin termed B. fragilis toxin (BFT). ETBF disease in animals is associated with an acute inflammatory response in the intestinal mucosa, and lethal hemorrhagic colitis may occur in rabbits. In this study, we confirmed recent reports (J. M. Kim, Y. K. Oh, Y. J. Kim, H. B. Oh, and Y. J. Cho, Clin. Exp. Immunol. 123:421-427, 2001; L. Sanfilippo, C. K. Li, R. Seth, T. J. Balwin, M. J. Menozzi, and Y. R. Mahida, Clin. Exp. Immunol. 119:456-463, 2000) that purified BFT stimulates interleukin-8 (IL-8) secretion by human intestinal epithelial cells (HT29/C1 cells) and demonstrate that stimulation of IL-8 production is dependent on biologically active BFT and independent of serum. Induction of IL-8 mRNA expression occurs rapidly and ceases by 6 h after BFT treatment, whereas IL-8 secretion continues to increase for at least 18 h. Our data suggest that BFT-stimulated IL-8 secretion involves tyrosine kinase-dependent activation of nuclear factor-κB (NF-κB) as well as activation of the mitogen-activated protein kinases (MAPKs), p38 and extracellular signal-related kinase. Simultaneous activation of NF-κB and MAPKs appears necessary for secretion of IL-8 by HT29/C1 cells treated with BFT.

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