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Secreted proteins from Neisseria meningitidis mediate differential human gene expression and immune activation

Karen Robinson1, Maria Taraktsoglou, Kherie S J Rowe

  • 1Molecular Bacteriology and Immunology Group, Division of Microbiology and Infectious Diseases, University Hospital, Nottingham, NG7 2UH, UK.

Cellular Microbiology
|September 2, 2004
PubMed

Insights

Meningococcal secreted proteins (MSPs) trigger inflammatory responses and enhance resistance to apoptosis in host cells. These virulence factors are crucial for understanding meningococcal pathogenesis and host-bacterial interactions.

Area of Science:

  • Microbiology
  • Immunology
  • Pathogenesis

Background:

  • Meningococcal secreted proteins (MSPs) are largely uncharacterized.
  • The role of MSPs in host-bacterial interactions and disease pathogenesis requires investigation.

Purpose of the Study:

  • To investigate the impact of endotoxin-depleted MSPs on host gene expression in human meningeal cells.
  • To determine if MSPs induce pro-inflammatory and apoptosis-related gene expression.
  • To confirm the role of MSPs in host inflammatory responses and apoptosis resistance.

Main Methods:

  • Differential host gene expression analysis using expression arrays.
  • Validation of gene transcription via real-time PCR.
  • Confirmation of protein expression using ELISA, flow cytometry, and Western immunoblots.

Main Results:

  • MSPs significantly upregulated pro-inflammatory and apoptosis-related genes.
  • Interleukin 8 (IL-8) and cyclooxygenase 2 (COX-2) gene transcription and protein expression were increased.
  • Exposure to MSPs or live meningococci conferred a modest resistance to apoptosis.

Conclusions:

  • Secreted meningococcal virulence factors are key in eliciting host inflammatory responses.
  • MSPs contribute to host resistance to apoptosis, highlighting their importance in disease.
  • Further extensive investigation of MSPs is warranted due to their pathogenic significance.

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