Dual RNA-seq reveals the complement protein C3-mediated host-pathogen interaction in the brain abscess caused by...

Area of Science:

• Microbiology
• Immunology
• Molecular Biology

Background:

• Staphylococcus aureus causes brain abscesses, a serious infection.
• The role of complement protein C3 in S. aureus brain abscess pathogenesis is not fully understood.
• Understanding host-pathogen interactions is crucial for developing effective treatments.

Purpose of the Study:

• To elucidate the complement protein C3-mediated host-pathogen interaction in S. aureus-induced brain abscess.
• To investigate potential regulatory pathways between S. aureus and the host mediated by C3.
• To identify novel therapeutic targets for S. aureus infections.

Main Methods:

• Dual RNA-sequencing of C3-deficient and wild-type mice with S. aureus brain abscess.
• Analysis of bacterial virulence factors and host inflammatory gene expression.
• Validation using C3-deficient mice and S. aureus hla mutants; immunofluorescence and Western blot.

Main Results:

• Transcriptomic analysis revealed significant changes in bacterial virulence factors, including hemolysin, and identified a regulatory network (hrcA, dnaK) in S. aureus.
• hla was identified as a C3 response gene in S. aureus.
• C3 deficiency significantly altered host inflammatory response pathways and impaired immune recognition of pathogens.

Conclusions:

• Staphylococcus aureus affects host immune response through complement protein C3.
• C3 plays a critical role in regulating inflammation and immune signaling in S. aureus brain abscess.
• C3 deficiency impairs the host's ability to combat S. aureus infection, suggesting C3 as a potential therapeutic target.