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Targeted immunotherapy for staphylococcal infections : focus on anti-MSCRAMM antibodies
1Laboratory of Human Bacterial Pathogenesis, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, The National Institutes of Health, Hamilton, Montana 59840, USA. motto@niaid.nih.gov
Abstract:
Staphylococcal infections represent an enormous burden to the public health system in the US and worldwide. While traditionally restricted to the hospital setting, highly virulent strains have recently emerged that may cause severe, even fatal, disease in healthy adults outside healthcare settings. This situation, together with the increasing resistance to many antibacterials in a wide variety of staphylococcal strains, requires that vaccine development for staphylococcal diseases be re-evaluated. Finding a vaccine for staphylococci is not trivial, as protective immunity to staphylococcal infections does not appear to exist at a significant degree, which may be partly due to the fact that our immune system is in constant contact with staphylococcal antigens and many strains are commensal organisms on human epithelia. Furthermore, the most virulent species, Staphylococcus aureus, produces protein A, a powerful means to evade acquired host defense. While two high-profile vaccine preparations have failed clinical trials within the last few years, promising results from novel approaches based on the combination of systematically selected antigens have been reported. These combinatory vaccines target microbial surface components recognizing adhesive matrix molecules (MSCRAMMs), a family of bacterial proteins that bind to human extracellular matrix components. In addition, polysaccharide and other nonprotein antigens may represent suitable vaccine targets on the staphylococcal cell surface.
Insights
Developing effective staphylococcal vaccines is crucial due to rising infections and antibiotic resistance. Novel combinatory vaccines targeting surface proteins show promise for combating these challenging bacterial diseases.
Area of Science:
- Microbiology
- Immunology
- Vaccinology
Background:
- Staphylococcal infections pose a significant global public health burden.
- Emergence of highly virulent strains and increasing antibiotic resistance necessitate new prevention strategies.
- Staphylococcus aureus, a key species, evades host defenses via Protein A and its commensal nature complicates immunity.
Purpose of the Study:
- To re-evaluate vaccine development for staphylococcal diseases.
- To explore novel approaches for creating effective staphylococcal vaccines.
- To identify promising vaccine targets on the staphylococcal cell surface.
Main Methods:
- Reviewing challenges in staphylococcal vaccine development.
- Investigating novel vaccine strategies, including combinatory approaches.
- Analyzing microbial surface components recognizing adhesive matrix molecules (MSCRAMMs) as potential targets.
- Considering polysaccharide and other nonprotein antigens for vaccine development.
Main Results:
- Traditional vaccine approaches have faced setbacks, with notable clinical trial failures.
- Novel combinatory vaccines targeting MSCRAMMs have shown promising preliminary results.
- Staphylococcal surface components, including polysaccharides, are identified as potential vaccine targets.
Conclusions:
- Effective staphylococcal vaccines are urgently needed due to public health threats.
- Combinatory vaccines targeting MSCRAMMs represent a promising avenue for future development.
- Further research into diverse staphylococcal antigens is essential for successful vaccine design.
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