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Lymphatic Endothelial Cells Are Essential Components of the Subcapsular Sinus Macrophage Niche.


ABSTRACT: In lymph nodes, subcapsular sinus macrophages (SSMs) form an immunological barrier that monitors lymph drained from peripheral tissues. Upon infection, SSMs activate B and natural killer T (NKT) cells while secreting inflammatory mediators. Here, we investigated the mechanisms regulating development and homeostasis of SSMs. Embryonic SSMs originated from yolk sac hematopoiesis and were replaced by a postnatal wave of bone marrow (BM)-derived monocytes that proliferated to establish the adult SSM network. The SSM network self-maintained by proliferation with minimal BM contribution. Upon pathogen-induced transient deletion, BM-derived cells contributed to restoring the SSM network. Lymphatic endothelial cells (LECs) were the main source of CSF-1 within the lymph node and conditional deletion of Csf1 in adult LECs decreased the network of SSMs and medullary sinus macrophages (MSMs). Thus, SSMs have a dual hematopoietic origin, and LECs are essential to the niche supporting these macrophages.

SUBMITTER: Mondor I 

PROVIDER: S-EPMC6697131 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Lymphatic Endothelial Cells Are Essential Components of the Subcapsular Sinus Macrophage Niche.

Mondor Isabelle I   Baratin Myriam M   Lagueyrie Marine M   Saro Lisa L   Henri Sandrine S   Gentek Rebecca R   Suerinck Delphine D   Kastenmuller Wolfgang W   Jiang Jean X JX   Bajénoff Marc M  

Immunity 20190430 6


In lymph nodes, subcapsular sinus macrophages (SSMs) form an immunological barrier that monitors lymph drained from peripheral tissues. Upon infection, SSMs activate B and natural killer T (NKT) cells while secreting inflammatory mediators. Here, we investigated the mechanisms regulating development and homeostasis of SSMs. Embryonic SSMs originated from yolk sac hematopoiesis and were replaced by a postnatal wave of bone marrow (BM)-derived monocytes that proliferated to establish the adult SSM  ...[more]

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