M1 protein of Streptococcus pyogenes increases production of the antibacterial CXC chemokine MIG/CXCL9 in pharyngeal epithelial cells.

Streptococcus pyogenes adheres to epithelial cells of the human pharynx where it can cause pharyngitis. To counteract infection, inflamed epithelium produces peptide antibiotics, among them the CXC chemokine MIG/CXCL9. M protein is both a surface-associated and released virulence factor of S. pyogenes. Here, we show that soluble M1 protein enhances MIG gene expression and synthesis in IFN-gamma stimulated epithelial cells. M1 protein was recognized both by resting and IFN-gamma activated pharyngeal epithelial cells as detected by activation of the transcription factor NF-kappaB. Furthermore, pharmacological inhibition of NF-kappaB, decreased MIG synthesis in IFN-gamma activated cells, demonstrating a key role for NF-kappaB in mediating the enhanced response. Microarrays were used to investigate expression of recognized antimicrobial peptides in pharyngeal epithelial cells after stimulation with a combination of IFN-gamma and M1 protein. Amongst the most up-regulated and expressed genes, were several antibacterial CC and CXC chemokines. To investigate an in vivo context, pharyngeal mucosa was stimulated in vitro and MIG could be detected by immunohistochemistry in epithelial cells. The results show that epithelial cells can recognize solubilized M1 protein and intact S. pyogenes, thereby modulating an antibacterial innate host response that may have bearing on the outcome of streptococcal pharyngitis.
AuthorsMette Eliasson, Inga-Maria Frick, Mattias Collin, Ole E Sørensen, Lars Björck, Arne Egesten
JournalMicrobial pathogenesis (Microb Pathog) 2007 Nov-Dec Vol. 43 Issue 5-6 Pg. 224-33 ISSN: 0882-4010 [Print] England
PMID17681739 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Antigens, Bacterial
  • Bacterial Outer Membrane Proteins
  • CXC chemokine Mig
  • Carrier Proteins
  • Chemokine CXCL9
  • streptococcal M protein
  • Antigens, Bacterial (metabolism, pharmacology)
  • Bacterial Outer Membrane Proteins (metabolism, pharmacology)
  • Carrier Proteins (metabolism, pharmacology)
  • Cell Line
  • Chemokine CXCL9 (metabolism)
  • Epithelial Cells (drug effects, metabolism, microbiology)
  • Humans
  • Pharynx (cytology, metabolism)
  • Streptococcal Infections (immunology)
  • Streptococcus pyogenes (chemistry)

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research network!

Choose Username:
Verify Password: