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Similar ability of FbaA with M protein to elicit protective immunity against group A streptococcus challenge in mice
Cui Qing Ma1, Cai Hong Li, Xiu Rong Wang
1Department of Immunology, Basic Medical College, Hebei Medical University, Shijiazhuang 050017, China.
Abstract:
Group A streptococcus (GAS), an important human pathogen, can cause various kinds of infections including superficial infections and potentially lethal infections, and the search for an effective vaccine to prevent GAS infections has been ongoing for many years. This paper compares the immunogenicity and immunoprotection of FbaA (an Fn-binding protein expressed on the surface of GAS) with that of M protein, the best immunogen of GAS. Assay for immune response showed that FbaA, similar to M protein, could induce protein-specific high IgG titer in BALB/c mice. Furthermore, following GAS challenge, the mice immunized with FbaA showed the same protective rate as those with M protein. These results indicate that FbaA is similar in ability to M protein in inducing protective immunity against GAS challenge in mice.
Insights
Group A Streptococcus (GAS) vaccine development is crucial. Fibronectin-binding protein A (FbaA) demonstrated similar immunogenicity and protective immunity against GAS challenge in mice compared to the established M protein.
Area of Science:
- Microbiology
- Immunology
- Vaccine Development
Background:
- Group A Streptococcus (GAS) is a significant human pathogen causing diverse infections.
- Developing an effective GAS vaccine remains a priority due to the pathogen's potential for severe and lethal disease.
- M protein is a well-characterized GAS immunogen, but other surface proteins are being investigated for vaccine potential.
Purpose of the Study:
- To compare the immunogenicity and immunoprotection of Fibronectin-binding protein A (FbaA) against M protein from GAS.
- To evaluate FbaA as a potential vaccine candidate against GAS infections.
Main Methods:
- Immunization of BALB/c mice with purified FbaA or M protein.
- Assessing protein-specific IgG antibody titers post-immunization.
- Challenging immunized mice with GAS to determine protective efficacy.
Main Results:
- Both FbaA and M protein induced high, protein-specific IgG titers in mice.
- Mice immunized with FbaA exhibited a protective rate comparable to those immunized with M protein following GAS challenge.
- FbaA demonstrated significant immunoprotective capabilities.
Conclusions:
- FbaA elicits a robust immune response and provides significant protection against GAS challenge in a mouse model.
- FbaA shows comparable immunogenicity and immunoprotection to M protein, suggesting its potential as a valuable component in a GAS vaccine.
