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Sci Rep. 2018 Sep 17;8(1):13948. doi: 10.1038/s41598-018-31887-4.

Kidney-resident macrophages promote a proangiogenic environment in the normal and chronically ischemic mouse kidney.

Author information

1
The Divisions of Nephrology & Hypertension, Mayo Clinic, Rochester, MN, USA.
2
Colton Center for Autoimmunity, New York University School of Medicine, New York, NY, USA.
3
Biogen, Cambridge, MA, USA.
4
Rheumatology, Mayo Clinic, Rochester, MN, USA.
5
Department of Pathology, Washington University School of Medicine, Saint Louis, MO, USA.
6
Departments of Immunology, Mayo Clinic, Rochester, MN, USA.
7
Departments of Laboratory Medicine & Pathology, Mayo Clinic, Rochester, MN, USA.
8
Departments of Cardiovascular Diseases, Mayo Clinic, Rochester, MN, USA.
9
University of Kansas, School of Medicine, Kansas City, KS, USA.
10
University of Washington, Seattle, WA, USA.
11
Vertex Pharmaceuticals, Boston, MA, USA.
12
The Divisions of Nephrology & Hypertension, Mayo Clinic, Rochester, MN, USA. Lerman.Lilach@mayo.edu.

Abstract

Renal artery stenosis (RAS) caused by narrowing of arteries is characterized by microvascular damage. Macrophages are implicated in repair and injury, but the specific populations responsible for these divergent roles have not been identified. Here, we characterized murine kidney F4/80+CD64+ macrophages in three transcriptionally unique populations. Using fate-mapping and parabiosis studies, we demonstrate that CD11b/cint are long-lived kidney-resident (KRM) while CD11chiMϕ, CD11cloMϕ are monocyte-derived macrophages. In a murine model of RAS, KRM self-renewed, while CD11chiMϕ and CD11cloMϕ increased significantly, which was associated with loss of peritubular capillaries. Replacing the native KRM with monocyte-derived KRM using liposomal clodronate and bone marrow transplantation followed by RAS, amplified loss of peritubular capillaries. To further elucidate the nature of interactions between KRM and peritubular endothelial cells, we performed RNA-sequencing on flow-sorted macrophages from Sham and RAS kidneys. KRM showed a prominent activation pattern in RAS with significant enrichment in reparative pathways, like angiogenesis and wound healing. In culture, KRM increased proliferation of renal peritubular endothelial cells implying direct pro-angiogenic properties. Human homologs of KRM identified as CD11bintCD11cintCD68+ increased in post-stenotic kidney biopsies from RAS patients compared to healthy human kidneys, and inversely correlated to kidney function. Thus, KRM may play protective roles in stenotic kidney injury through expansion and upregulation of pro-angiogenic pathways.

PMID:
30224726
PMCID:
PMC6141464
DOI:
10.1038/s41598-018-31887-4
[Indexed for MEDLINE]
Free PMC Article

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