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Updated: Jan 8, 2026
Phenotypic Characterization of Macrophages from Rat Kidney by Flow Cytometry
Published on: October 18, 2016
New insights into macrophage heterogeneity in renal injury and repair
1Department of General Surgery and NHC Key Laboratory of Transplant Engineering and Immunology, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China.
Abstract:
Although macrophages (MФs) are vital regulators of acute kidney injury (AKI), their diverse roles in renal injury and repair remain elusive. Li et al. leveraged single-cell RNA sequencing to dissect MФ dynamics at different stages of cisplatin-induced AKI. They identified four distinct renal MФ subsets, in which monocyte-derived MФs (Mo-MФs) drive major renal inflammation during AKI progression, whereas renal resident Cx3cr1+ MФs promote renal repair via AXL-GAS6 signaling-mediated efferocytosis during AKI regression. This work advances our understanding of innate immune responses in AKI and provides insights into the heterogeneity of MФs in renal injury and repair.
Insights
Macrophages play key roles in acute kidney injury (AKI). Monocyte-derived macrophages (Mo-MФs) worsen AKI, while resident macrophages promote kidney repair through efferocytosis.
Area of Science:
- Nephrology
- Immunology
- Cell Biology
Background:
- Macrophages (MФs) are critical in acute kidney injury (AKI) but their specific roles in renal injury and repair are not fully understood.
- Understanding macrophage heterogeneity is crucial for developing targeted therapies for AKI.
Purpose of the Study:
- To investigate the dynamic changes and functional heterogeneity of macrophages during cisplatin-induced AKI.
- To elucidate the distinct roles of different macrophage subsets in AKI progression and regression.
Main Methods:
- Single-cell RNA sequencing was employed to analyze macrophage populations at various stages of AKI.
- Analysis focused on identifying distinct macrophage subsets and their gene expression profiles.
Main Results:
- Four distinct renal macrophage subsets were identified.
- Monocyte-derived MФs (Mo-MФs) were found to drive renal inflammation during AKI progression.
- Renal resident Cx3cr1+ MФs were identified as crucial for renal repair, mediating efferocytosis via AXL-GAS6 signaling during AKI regression.
Conclusions:
- This study reveals the heterogeneity of macrophage responses in AKI, differentiating between pro-inflammatory and pro-repair subsets.
- The findings highlight the distinct roles of Mo-MФs and resident MФs in AKI pathogenesis and resolution.
- Targeting specific macrophage subsets, particularly resident MФs and their efferocytic pathways, may offer therapeutic strategies for AKI.
