[HTML][HTML] Macrophage and T cell dynamics during the development and disintegration of mycobacterial granulomas

JG Egen, AG Rothfuchs, CG Feng, N Winter, A Sher… - Immunity, 2008 - cell.com
JG Egen, AG Rothfuchs, CG Feng, N Winter, A Sher, RN Germain
Immunity, 2008cell.com
Granulomas play a key role in host protection against mycobacterial pathogens, with their
breakdown contributing to exacerbated disease. To better understand the initiation and
maintenance of these structures, we employed both high-resolution multiplex static imaging
and intravital multiphoton microscopy of Mycobacterium bovis BCG-induced liver
granulomas. We found that Kupffer cells directly capture blood-borne bacteria and
subsequently nucleate formation of a nascent granuloma by recruiting both uninfected liver …
Summary
Granulomas play a key role in host protection against mycobacterial pathogens, with their breakdown contributing to exacerbated disease. To better understand the initiation and maintenance of these structures, we employed both high-resolution multiplex static imaging and intravital multiphoton microscopy of Mycobacterium bovis BCG-induced liver granulomas. We found that Kupffer cells directly capture blood-borne bacteria and subsequently nucleate formation of a nascent granuloma by recruiting both uninfected liver-resident macrophages and blood-derived monocytes. Within the mature granuloma, these myeloid cell populations formed a relatively immobile cellular matrix that interacted with a highly dynamic effector T cell population. The efficient recruitment of these T cells was highly dependent on TNF-α-derived signals, which also maintained the granuloma structure through preferential effects on uninfected macrophage populations. By characterizing the migration of both innate and adaptive immune cells throughout the process of granuloma development, these studies provide a new perspective on the cellular events involved in mycobacterial containment and escape.
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