Peripherally derived macrophages can engraft the brain independent of irradiation and maintain an identity distinct from microglia

James C. Cronk, Anthony J. Filiano, Antoine Louveau, Ioana Marin, Rachel Marsh, Emily Ji, Dylan H. Goldman, Igor Smirnov, Nicholas Geraci, Scott Acton, Christopher C. Overall, Jonathan Kipnis

Research output: Contribution to journalArticle

99 Scopus citations

Abstract

Peripherally derived macrophages infiltrate the brain after bone marrow transplantation and during central nervous system (CNS) inflammation. It was initially suggested that these engrafting cells were newly derived microglia and that irradiation was essential for engraftment to occur. However, it remains unclear whether brain-engrafting macrophages (beMϕs) acquire a unique phenotype in the brain, whether long-term engraftment may occur without irradiation, and whether brain function is affected by the engrafted cells. In this study, we demonstrate that chronic, partial microglia depletion is sufficient for beMϕs to populate the niche and that the presence of beMϕs does not alter behavior. Furthermore, beMϕs maintain a unique functional and transcriptional identity as compared with microglia. Overall, this study establishes beMϕs as a unique CNS cell type and demonstrates that therapeutic engraftment of beMϕs may be possible with irradiation-free conditioning regimens.

Original languageEnglish
Pages (from-to)1627-1647
Number of pages21
JournalJournal of Experimental Medicine
Volume215
Issue number6
DOIs
StatePublished - Jun 1 2018

Fingerprint Dive into the research topics of 'Peripherally derived macrophages can engraft the brain independent of irradiation and maintain an identity distinct from microglia'. Together they form a unique fingerprint.

Cite this