Heterogeneity in tuberculosis pathology, microenvironments and therapeutic responses

Area of Science:

• Immunology
• Microbiology
• Pulmonary Medicine

Background:

• Tuberculosis (TB) lesions are complex and dynamic pulmonary sites.
• Mycobacterium tuberculosis (M.tb) infection leads to diverse granulomas and cavities.
• These structures create varied microenvironments influencing bacterial populations.

Purpose of the Study:

• To review the types and fates of pulmonary TB lesions.
• To examine the impact of lesion heterogeneity on M.tb.
• To discuss recent paradigm shifts in understanding lesion progression.

Main Methods:

• Literature review of TB lesion dynamics.
• Analysis of host-pathogen interactions within lesions.
• Synthesis of current research on lesion heterogeneity.

Main Results:

• TB lesions exhibit spatial and temporal heterogeneity.
• Microenvironments within lesions affect M.tb replication, metabolism, and density.
• Bacterial subpopulations show differential susceptibility to chemotherapy.
• Lesion progression is dynamic and locally driven, not uniform.

Conclusions:

• A paradigm shift is occurring in understanding TB lesion progression.
• Lesion heterogeneity impacts treatment efficacy and necessitates personalized approaches.
• Further research is needed for predictive biomarkers and novel therapies.