Humanized mouse model to study bacterial infections targeting the microvasculature

Area of Science:

• Infectious Diseases
• Pathogenesis Research
• Animal Models

Background:

• Neisseria meningitidis causes life-threatening sepsis with severe vascular damage.
• Studying N. meningitidis pathogenesis is challenging due to its human specificity, limiting in vivo models.
• Existing models do not fully replicate human vascular responses to meningococcal infection.

Purpose of the Study:

• To develop and validate a humanized mouse model for studying Neisseria meningitidis pathogenesis.
• To investigate the mechanisms of vascular damage and purpuric rash development in meningococcal sepsis.
• To provide a platform for evaluating potential therapeutic interventions against human-specific pathogens.

Main Methods:

• Grafting human skin with dermal microvessels onto immunocompromised mice.
• Allowing vascular anastomosis between human graft and mouse circulation.
• Infecting the humanized model with Neisseria meningitidis and evaluating host-pathogen interactions.

Main Results:

• N. meningitidis selectively adhered to the human dermal microvessels within the graft.
• The model demonstrated extensive vascular damage, inflammation, and purpuric rash formation.
• Human vessels maintained their integrity and human characteristics post-anastomosis.

Conclusions:

• The humanized skin graft model effectively replicates key aspects of Neisseria meningitidis sepsis.
• This model provides a valuable tool for studying the pathogenesis of human-specific vascular infections.
• The technique is adaptable for investigating other blood-stream pathogens with human specificity.