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Updated: Jan 18, 2026
Rapid Depletion of Renal Macrophages Using Human CD59/Intermedilysin Cell Ablation Tool
Published on: May 9, 2025
Rapid Depletion of Renal Macrophages Using Human CD59/Intermedilysin Cell Ablation Tool
Mohammad Islamuddin1, Jefferson Evangelista1, Mohammad Enamul Kabir1
1Division of Comparative Pathology, Tulane National Primate Research Center; Department of Microbiology and Immunology, Tulane University School of Medicine.
Abstract:
Renal macrophages (RMs) are essential for kidney health, orchestrating immune surveillance, tissue homeostasis, and responses to injury. Previously, we reported the use of a human CD59 (hCD59)/intermedilysin (ILY) cell ablation tool to study the distinct fate, dynamics, and niches of RMs of bone marrow or embryonic origin. RMs originate from yolk sac-derived macrophages, fetal liver monocytes, and bone marrow-derived monocytes and are maintained in adulthood through local proliferation and recruitment of circulating monocytes. Here, we report a detailed protocol for the selective ablation of RMs to study their regeneration, including 1) generation and characterization of the Cre-inducible expression of hCD59 in mouse RMs, 2) purification of ILY and characterization of ILY activity, 3) induction of hCD59 expression on RMs in compound mice, and 4) characterization of regeneration after ILY-mediated RM ablation. ILY specifically and rapidly depletes RMs in compound mice, with efficient macrophage ablation within 1 day of ILY administration. Renal macrophage regeneration began by day 3 post-ablation, with ~88% recovery by day 7. This model offers a powerful tool for studying macrophage biology and can be used for selectively ablating other cell populations in the kidney, liver, and fatty tissues to investigate their function and regeneration.
Insights
Researchers developed a novel method to selectively eliminate renal macrophages (RMs) in mice. This technique allows for the study of RM regeneration and function, offering insights into kidney health and immune responses.
Area of Science:
- Immunology
- Cell Biology
- Regenerative Medicine
Background:
- Renal macrophages (RMs) are crucial for kidney immune surveillance, homeostasis, and injury response.
- RMs originate from diverse embryonic and adult sources, including yolk sac, fetal liver, and bone marrow monocytes.
- Understanding RM dynamics and regeneration is vital for kidney health research.
Purpose of the Study:
- To develop and validate a protocol for the selective ablation and subsequent study of renal macrophage regeneration.
- To establish a Cre-inducible mouse model for targeted renal macrophage depletion using human CD59 (hCD59) and intermedilysin (ILY).
Main Methods:
- Generation and characterization of a mouse model with Cre-inducible hCD59 expression in RMs.
- Purification and activity assessment of intermedilysin (ILY).
- Induction of hCD59 expression on RMs followed by ILY-mediated ablation and monitoring of regeneration.
Main Results:
- ILY administration rapidly and specifically depleted RMs within 1 day in compound mice.
- Renal macrophage regeneration commenced by day 3 post-ablation.
- Approximately 88% of RMs regenerated by day 7 post-ablation.
Conclusions:
- The developed hCD59/ILY system provides a powerful and efficient tool for selective renal macrophage ablation in mice.
- This model facilitates the study of macrophage biology, regeneration, and function in the kidney.
- The methodology can be adapted for ablating other cell populations in various organs for functional studies.
