Streptococcus pyogenes M49 Plasminogen/Plasmin Binding Facilitates Keratinocyte Invasion via Integrin-Integrin-linked Kinase (ILK) Pathways and Protects from Macrophage Killing
Streptococcus pyogenes M49 Plasminogen/Plasmin Binding Facilitates Keratinocyte Invasion via Integrin-Integrin-linked Kinase (ILK) Pathways and Protects from Macrophage Killing
The entry into epithelial cells and the prevention of primary immune responses are a prerequisite for a successful colonization and subsequent infection of the human host by Streptococcus pyogenes (group A streptococci, GAS). Here, we demonstrate that interaction of GAS with plasminogen promotes an integrin-mediated internalization of the bacteria into keratinocytes, which is independent from the serine protease activity of potentially generated plasmin. α(1)β(1)- and α(5)β(1)-integrins were identified as the major keratinocyte receptors involved in this process. Inhibition of integrin-linked kinase (ILK) expression by siRNA silencing or blocking of PI3K and Akt with specific inhibitors, reduced the GAS M49-plasminogen/plasmin-mediated invasion of keratinocytes. In addition, blocking of actin polymerization significantly reduced GAS internalization into keratinocytes. Altogether, these results provide a first model of plasminogen-mediated GAS invasion into keratinocytes. Furthermore, we demonstrate that plasminogen binding protects the bacteria against macrophage killing.
- University of Rostock Germany
- Institute of Medical Microbiology and Hygiene Germany
Keratinocytes, Integrins, Models, Genetic, Streptococcus pyogenes, Macrophages, Protein Serine-Threonine Kinases, Models, Biological, Integrin alpha1beta1, Bacteriocins, Cell Line, Tumor, Cell Adhesion, Humans, Fibrinolysin, Peptides, Integrin alpha5beta1, Protein Binding
Keratinocytes, Integrins, Models, Genetic, Streptococcus pyogenes, Macrophages, Protein Serine-Threonine Kinases, Models, Biological, Integrin alpha1beta1, Bacteriocins, Cell Line, Tumor, Cell Adhesion, Humans, Fibrinolysin, Peptides, Integrin alpha5beta1, Protein Binding
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