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Updated: Nov 3, 2025
Phenotypic Characterization of Macrophages from Rat Kidney by Flow Cytometry
Published on: October 18, 2016
Macrophage Heterogeneity in Kidney Injury and Fibrosis
Yi Wen1, Hong-Ru Yan1, Bin Wang1
1Department of Nephrology, Zhongda Hospital, Southeast University School of Medicine, Nanjing, China.
Abstract:
Kidney macrophages are central in kidney disease pathogenesis and have therapeutic potential in preventing tissue injury and fibrosis. Recent studies highlighted that kidney macrophages are notably heterogeneous immune cells that fulfill opposing functions such as clearing deposited pathogens, maintaining immune tolerance, initiating and regulating inflammatory responses, promoting kidney fibrosis, and degrading the extracellular matrix. Macrophage origins can partially explain macrophage heterogeneity in the kidneys. Circulating Ly6C+ monocytes are recruited to inflammatory sites by chemokines, while self-renewed kidney resident macrophages contribute to kidney repair and fibrosis. The proliferation of resident macrophages or infiltrating monocytes provides an alternative explanation of macrophage accumulation after kidney injury. In addition, dynamic Ly6C expression on infiltrating monocytes accompanies functional changes in handling kidney inflammation and fibrosis. Mechanisms underlying kidney macrophage heterogeneity, either by recruiting monocyte subpopulations, regulating macrophage polarization, or impacting distinctive macrophage functions, may help develop macrophage-targeted therapies for kidney diseases.
Insights
Kidney macrophages are key to kidney disease. Understanding their diverse roles and origins, like infiltrating monocytes and resident cells, is crucial for developing new therapies targeting kidney inflammation and fibrosis.
Area of Science:
- Immunology
- Nephrology
- Cell Biology
Background:
- Kidney macrophages play a critical role in the pathogenesis of kidney diseases, exhibiting diverse functions.
- These immune cells can either protect against or promote tissue injury and fibrosis.
- Macrophage heterogeneity is a key factor in understanding kidney disease progression.
Purpose of the Study:
- To explore the heterogeneity of kidney macrophages and their origins.
- To investigate the opposing functions of different kidney macrophage subsets.
- To identify mechanisms underlying macrophage heterogeneity for therapeutic development.
Main Methods:
- Analysis of macrophage origins, including circulating monocytes and resident macrophages.
- Investigation of macrophage proliferation and Ly6C expression dynamics.
- Examination of macrophage functions in kidney inflammation and fibrosis.
Main Results:
- Kidney macrophages are heterogeneous, performing functions ranging from pathogen clearance to fibrosis promotion.
- Macrophage heterogeneity is influenced by their origin: circulating monocytes vs. self-renewing resident macrophages.
- Ly6C expression on infiltrating monocytes dynamically changes with kidney inflammation and fibrosis.
Conclusions:
- Understanding kidney macrophage heterogeneity is vital for developing targeted therapies.
- Mechanisms involving monocyte recruitment, polarization, and function are key targets.
- Macrophage-targeted therapies hold significant potential for treating kidney diseases.
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