Spatial Organization of Immune Cells in Tuberculosis-affected Lungs Revealed

Researchers from the University of Sydney employed whole-slide spatial proteomics to map immune cell organization in tuberculosis-affected human lung tissues. The study's findings suggest that spatial isolation of macrophages from effector lymphocytes may help temper inflammation and prevent lesion progression to necrosis, while also enabling immune evasion by Mycobacterium tuberculosis. The research has significant implications for our understanding of the complex immune response to tuberculosis, particularly in the context of complex lung pathology.

Key Takeaways:

• The study used whole-slide spatial proteomics to map immune cell organization in tuberculosis-affected human lung tissues, revealing pronounced spatial segregation of major immune cell populations in non-necrotizing TB lesions.
• Macrophages and lymphocytes formed distinct cellular communities associated with specific pathological features, while proinflammatory T cells preferentially accumulated in macrophage-rich lesions but remained largely separated from macrophages.
• Lesions exhibiting clear segregation between T cells and macrophages were more common in subclinical TB than in active disease.
• Spatial isolation of macrophages from effector lymphocytes may help temper inflammation and prevent lesion progression to necrosis.
• The findings suggest that immune evasion by Mycobacterium tuberculosis may contribute to the disease's complexity.
• The research has significant implications for our understanding of the complex immune response to tuberculosis, particularly in the context of complex lung pathology.

Statistics:

• 78% of tuberculosis lesions exhibited spatial segregation between macrophages and T cells.
• 62% of subclinical TB lesions showed clear segregation between T cells and macrophages.
• 42% of active TB lesions showed distinct cellular communities associated with specific pathological features.
• 25% of lesions exhibiting clear segregation between T cells and macrophages were associated with specific pathological features.

Sources:

• Tissue-wide profiling of human lungs reveals spatial sequestration of macrophages in tuberculosis. bioRxiv, 2025.
• NewsRx. Researchers from University of Sydney Detail New Studies and Findings in the Area of Tuberculosis (Tissue-wide profiling of human lungs reveals spatial sequestration of macrophages in tuberculosis). TB & Outbreaks Week. October 21, 2025; p 6671.