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What is granulomatous inflammation and how is it connected to tuberculosis?

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Pathways of complement activation — inflammation The main function of complement proteins is to aid in the destruction of pathogens by piercing their outer membranes (cell lysis) or by making them more attractive to phagocytic cells such as macrophages (a process known as opsonization). Some complement components also promote inflammation by stimulating cells to release histamine and by attracting phagocytic cells to the site of infection.

Granulomatous inflammation is a distinct form of chronic inflammation characterized by the formation of granulomas—small, nodular collections of modified macrophages known as epithelioid cells, typically surrounded by lymphocytes. These structures often contain giant, or Langhans, cells formed by the fusion of epithelioid cells, which the immune system uses to sequester indigestible or persistent materials.12

Tuberculosis serves as a classic example of this inflammatory response. When the body is infected by Mycobacterium tuberculosis, the immune system attempts to contain the pathogen by forming specific granulomas called tubercles.1

While granuloma formation is an immune strategy to isolate infectious agents, it can be a double-edged sword. In conditions like pulmonary tuberculosis, the persistent inflammatory response and the enzymes secreted by macrophages can distort normal tissue structure, often causing more significant damage than the infectious organism itself.2