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Characterization and immunogenicity of Kingella kingae outer-membrane proteins
Pablo Yagupsky1, Ariela Slonim
1Clinical Microbiology Laboratory, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel. yagupsky@bgumail.bgu.ac.il
FEMS Immunology and Medical Microbiology
|December 21, 2004
Summary
Kingella kingae outer membrane proteins are highly conserved across strains, but variations in their immunogenic epitopes lead to diverse host immune responses in children with invasive infections.
Area of Science:
- Microbiology
- Immunology
- Pediatric Infectious Diseases
Background:
- Kingella kingae is an emerging pediatric pathogen.
- The antigenicity and host immune response to K. kingae remain understudied.
Purpose of the Study:
- To characterize the outer membrane proteins (OMPs) of Kingella kingae.
- To investigate the host immune response to K. kingae OMPs in children with invasive infections.
Main Methods:
- Characterization of OMPs from 57 K. kingae isolates.
- Immunoblotting analysis of immune responses using sera from 19 infected children.
Main Results:
- K. kingae OMPs showed remarkable similarity across isolates, irrespective of isolation source or clinical condition.
- While most OMPs were immunogenic, reactivity patterns and band intensities varied significantly between strains and sera.
- Analysis of convalescent sera revealed epitopes not recognized by homologous sera or present in homologous strains, indicating epitope polymorphism.
Conclusions:
- Kingella kingae OMPs are highly conserved, suggesting a stable target for potential diagnostics or therapeutics.
- Polymorphic epitopes within K. kingae OMPs contribute to a variable host immune response.
- Further research into specific epitopes could elucidate mechanisms of K. kingae pathogenesis and host defense.