Bone marrow Ly6Chigh monocytes are selectively recruited to injured kidney and differentiate into functionally distinct populations
Journal
Journal of Immunology
Journal Volume
183
Journal Issue
10
Pages
6733-6743
Date Issued
2009
Author(s)
Abstract
Roles for monocyte/macrophages (Mφ) in directing the development of tissue fibrosis are increasingly recognized. Macrophages form a heterogeneous group of inflammatory leukocytes, and the mechanisms by which they acquire heterogeneity and its functional significance are unclear. We used the unilateral ureteral obstruction model of progressive kidney fibrosis to explore macrophage heterogeneity and function further. Unilateral ureteral obstruction kidney Mφs form three distinct subpopulations defined by the marker Ly6C, all of which are derived from a single Ly6Chigh bone marrow monocyte population selectively recruited to the kidney. Conditional ablation of these Mφs in vivo in CD11b-DTR mice is potently antifibrotic. The mRNA transcription profile of these populations is consistent with differential functional roles for each subpopulation, with Ly6Clow macrophages transcribing genes consistent with selective profibrotic or M2-type function. Furthermore, bone marrow chimerism studies indicate that although resident kidney macrophages proliferate markedly to comprise up to 40% of the inflammatory macrophage population, they do not contribute to fibrosis. Our data identify Ly6C as a marker of functionally discrete tissue macrophage subsets and support a model of selective recruitment of Ly6Chigh bone marrow monocytes to the kidney that differentiate into three populations of kidney macrophages, including a profibrotic Ly6Clow population. Copyright ? 2009 by The American Association of Immunologists, Inc.
SDGs
Other Subjects
biological marker; CD11b antigen; messenger RNA; biological marker; Ly 6C antigen, mouse; Ly antigen; Ly-6C antigen, mouse; animal experiment; animal model; animal tissue; article; bone marrow; cell differentiation; cell population; cell proliferation; cell subpopulation; chimera; controlled study; genetic transcription; human; inflammatory cell; kidney fibrosis; kidney injury; macrophage; macrophage function; male; monocyte; mouse; nonhuman; priority journal; ureter obstruction; adoptive transfer; animal; C57BL mouse; disease model; fibrosis; immunology; kidney; macrophage; metabolism; pathology; spleen; Adoptive Transfer; Animals; Antigens, Ly; Biological Markers; Bone Marrow; Disease Models, Animal; Fibrosis; Kidney; Macrophages; Male; Mice; Mice, Inbred C57BL; Monocytes; Spleen
Type
journal article