Artigo Acesso aberto Revisado por pares

Differential roles of microglia and monocytes in the inflamed central nervous system

2014; Rockefeller University Press; Volume: 211; Issue: 8 Linguagem: Inglês

10.1084/jem.20132477

ISSN

1540-9538

Autores

Ryo Yamasaki, Haiyan Lu, Oleg Butovsky, Nobuhiko Ohno, Anna Rietsch, Ron Cialic, Pauline Wu, Camille Doykan, Jessica Lin, Anne C. Cotleur, Grahame J. Kidd, Musab M. Zorlu, Nathan Sun, Weiwei Hu, LiPing Liu, Jar-Chi Lee, Sarah E. Taylor, Lindsey Uehlein, Debra Dixon, Jinyu Gu, Crina M. Floruta, Min Zhu, Israel Charo, Howard L. Weiner, Richard M. Ransohoff,

Tópico(s)

Immune Response and Inflammation

Resumo

In the human disorder multiple sclerosis (MS) and in the model experimental autoimmune encephalomyelitis (EAE), macrophages predominate in demyelinated areas and their numbers correlate to tissue damage. Macrophages may be derived from infiltrating monocytes or resident microglia, yet are indistinguishable by light microscopy and surface phenotype. It is axiomatic that T cell–mediated macrophage activation is critical for inflammatory demyelination in EAE, yet the precise details by which tissue injury takes place remain poorly understood. In the present study, we addressed the cellular basis of autoimmune demyelination by discriminating microglial versus monocyte origins of effector macrophages. Using serial block-face scanning electron microscopy (SBF-SEM), we show that monocyte-derived macrophages associate with nodes of Ranvier and initiate demyelination, whereas microglia appear to clear debris. Gene expression profiles confirm that monocyte-derived macrophages are highly phagocytic and inflammatory, whereas those arising from microglia demonstrate an unexpected signature of globally suppressed cellular metabolism at disease onset. Distinguishing tissue-resident macrophages from infiltrating monocytes will point toward new strategies to treat disease and promote repair in diverse inflammatory pathologies in varied organs.

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