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Kidney-resident macrophages promote a proangiogenic environment in the normal and chronically ischemic mouse kidney
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Kidney-resident macrophages promote a proangiogenic environment in the normal and chronically ischemic mouse kidney
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Kidney-resident macrophages promote a proangiogenic environment in the normal and chronically ischemic mouse kidney
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Journal Article
Kidney-resident macrophages promote a proangiogenic environment in the normal and chronically ischemic mouse kidney
2018
Overview
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/c
int
are long-lived kidney-resident (KRM) while CD11c
hi
Mϕ, CD11c
lo
Mϕ are monocyte-derived macrophages. In a murine model of RAS, KRM self-renewed, while CD11c
hi
Mϕ and CD11c
lo
Mϕ 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 CD11b
int
CD11c
int
CD68
+
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.
