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Humanized Mouse Model to Study Bacterial Infections Targeting the Microvasculature
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Dynamic niche-specific adaptations in Neisseria meningitidis during infection

Yan Liu1, Ding Zhang2, Åke Engström3

  • 1School of Life Sciences, Inner Mongolia University for Nationalities, Tongliao 028000, China.

Microbes and Infection
|October 21, 2015
PubMed

Insights

This study reveals how Neisseria meningitidis adapts to different host environments during infection. Bacterial protein levels change significantly, with adhesion to the nasal mucosa being the most challenging step for survival.

Area of Science:

  • Microbiology
  • Pathogen Biology
  • Proteomics

Background:

  • Neisseria meningitidis is an opportunistic pathogen causing meningitis and septicemia.
  • Bacterial adaptation to host environments is crucial for infection progression.
  • Understanding these adaptations can inform therapeutic strategies.

Purpose of the Study:

  • To comprehensively survey the proteome of N. meningitidis during infection.
  • To identify bacterial proteins with altered expression in different host niches (nasal mucosa, blood, CSF).
  • To investigate the functional roles of key proteins in bacterial fitness and survival in vivo.

Main Methods:

  • Proteomic analysis of N. meningitidis isolated from various sites in a mouse model.
  • Quantitative comparison of protein abundance across different infection stages.
  • Mutagenesis assays to assess the impact of specific proteins on bacterial fitness.

Main Results:

  • Identified 51 proteins with altered expression patterns during infection.
  • Significantly lower protein abundance in nasal mucosa isolates compared to blood and CSF isolates, indicating adhesion challenges.
  • High abundance of glutamate dehydrogenase (GdhA) and Opa1800 suggests essential roles in survival.
  • Mutagenesis of GroEL, GuaB, PilQ, and NMC0101 provided insights into their functional relevance.

Conclusions:

  • N. meningitidis exhibits significant niche-specific proteomic adaptations during infection.
  • Bacterial adhesion to the nasal mucosa presents a major survival challenge.
  • Specific proteins like GdhA and Opa1800 are critical for in vivo survival, and others play key roles in bacterial fitness.
Keywords:
Host adaptationNeisseria meningitidisProteomic analysisVirulence

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