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The interaction between staphylococcal superantigen-like proteins and human dendritic cells
A M Al-Shangiti1, S P Nair, B M Chain
1Ministry of Health, Riyadh, Kingdom of Saudi Arabia.
Clinical and Experimental Immunology
|June 4, 2005
Summary
Staphylococcal superantigen-like proteins (SSLs) from Staphylococcus aureus do not harm dendritic cells but can elicit immune responses in humans. These SSLs are immunogenic, stimulating both B and T cells, though their role in host-pathogen interaction remains unclear.
Area of Science:
- Immunology
- Microbiology
- Bacterial Pathogenesis
Background:
- Staphylococcus aureus produces staphylococcal superantigen-like proteins (SSLs) structurally similar to superantigens.
- SSLs are known to interact with antigen-presenting cells, such as dendritic cells.
Purpose of the Study:
- To investigate the functional consequences of SSL-dendritic cell interactions.
- To determine if SSLs elicit adaptive immune responses in humans.
Main Methods:
- Dendritic cells were exposed to SSL7 and SSL9.
- Assessed dendritic cell viability, morphology, maturation markers, and antigen uptake.
- Evaluated dendritic cell-mediated T cell stimulation.
- Tested human sera for antibodies against SSL7 and SSL9.
Main Results:
- SSL7 and SSL9 did not affect dendritic cell viability, morphology, maturation, or antigen uptake.
- Dendritic cells loaded with SSL7 or SSL9 stimulated T cell proliferation in a subset of healthy individuals.
- The majority of individuals possessed specific antibodies against SSL7 and SSL9, indicating immunogenicity.
Conclusions:
- SSLs are immunogenic in humans, eliciting both B and T cell responses.
- The interaction of SSLs with dendritic cells does not impair their basic functions.
- The precise role of SSL-induced immunity in the host-pathogen relationship requires further investigation.