Limited proliferation capacity of aortic intima resident macrophages requires monocyte recruitment for atherosclerotic plaque progression

Jesse W. Williams, Konstantin Zaitsev, Ki Wook Kim, Stoyan Ivanov, Brian T. Saunders, Patricia R. Schrank, Kyeongdae Kim, Andrew Elvington, Seung Hyeon Kim, Christopher G. Tucker, Mary Wohltmann, Brian T. Fife, Slava Epelman, Maxim N. Artyomov, Kory J. Lavine, Bernd H. Zinselmeyer, Jae Hoon Choi, Gwendalyn J. Randolph

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Early atherosclerosis depends upon responses by immune cells resident in the intimal aortic wall. Specifically, the healthy intima is thought to be populated by vascular dendritic cells (DCs) that, during hypercholesterolemia, initiate atherosclerosis by being the first to accumulate cholesterol. Whether these cells remain key players in later stages of disease is unknown. Using murine lineage-tracing models and gene expression profiling, we reveal that myeloid cells present in the intima of the aortic arch are not DCs but instead specialized aortic intima resident macrophages (MacAIR) that depend upon colony-stimulating factor 1 and are sustained by local proliferation. Although MacAIR comprise the earliest foam cells in plaques, their proliferation during plaque progression is limited. After months of hypercholesterolemia, their presence in plaques is overtaken by recruited monocytes, which induce MacAIR-defining genes. These data redefine the lineage of intimal phagocytes and suggest that proliferation is insufficient to sustain generations of macrophages during plaque progression.

Original languageEnglish
Pages (from-to)1194-1204
Number of pages11
JournalNature immunology
Volume21
Issue number10
DOIs
StatePublished - Oct 1 2020

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