Dissection of the host-pathogen interaction in human tuberculosis using a bioengineered 3-dimensional model.

Area of Science:

• Cell biology
• Immunology
• Pathogen research

Background:

• Cell biology differs significantly between 2-D cultures and 3-D systems, influenced by the extracellular matrix.
• Investigating virulent pathogens like Mycobacterium tuberculosis (Mtb) in 3-D environments presents unique experimental challenges.
• Tuberculosis (Mtb) is a major global health threat, characterized by complex immune responses and extracellular matrix remodeling.

Purpose of the Study:

• To develop and validate a 3-D cell culture model for studying host-pathogen interactions with virulent Mtb.
• To analyze the dynamics of Mtb infection within a 3-D collagen-alginate matrix using primary human cells.
• To assess the impact of therapeutic interventions on host-pathogen interactions in this 3-D tuberculosis model.

Main Methods:

• Development of a 3-D system combining virulent Mtb, human blood mononuclear cells, and a collagen-alginate matrix.
• Longitudinal monitoring of host-pathogen interactions over 21 days within the 3-D model.
• Optimization of multiparameter readouts to evaluate cytokine supplementation, host-directed therapy, and immunoaugmentation.

Main Results:

• The 3-D model supported greater cellular survival and allowed for extended observation periods compared to traditional methods.
• Key pathological features of human tuberculosis were recapitulated in the 3-D system.
• Extracellular matrix integrity was found to be crucial in favoring the host response over the pathogen.
• Evaluated interventions demonstrated both beneficial and detrimental effects on the host-pathogen interaction.

Conclusions:

• The developed 3-D system provides a robust platform for dissecting host-pathogen interactions in tuberculosis.
• This methodology is applicable to a wide range of infectious, inflammatory, and neoplastic diseases.
• The model facilitates the investigation of novel therapeutic strategies and vaccine development for tuberculosis and other diseases.