Cited by 363Phagocytosis and Immune RegulationCell death mechanisms and regulationAtherosclerosis and Cardiovascular Diseases

Efferocytosis induces macrophage proliferation to help resolve tissue injury

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Gerlach, Brennan D., Ampomah, Patrick B., Yurdagul, Arif, Liu, Chuang, Lauring, Max C., Wang, Xiaobo, Kasikara, Canan, Kong, Na +3 more·2021·Cell Metabolism

Abstract

Apoptotic cell clearance by macrophages (efferocytosis) promotes resolution signaling pathways, which can be triggered by molecules derived from the phagolysosomal degradation of apoptotic cells. We show here that nucleotides derived from the hydrolysis of apoptotic cell DNA by phagolysosomal DNase2a activate a DNA-PKcs-mTORC2/Rictor pathway that increases Myc to promote non-inflammatory macrophage proliferation. Efferocytosis-induced proliferation expands the pool of resolving macrophages in vitro and in mice, including zymosan-induced peritonitis, dexamethasone-induced thymocyte apoptosis, and atherosclerosis regression. In the dexamethasone-thymus model, hematopoietic Rictor deletion blocked efferocytosing macrophage proliferation, apoptotic cell clearance, and tissue resolution. In atherosclerosis regression, silencing macrophage Rictor or DNase2a blocked efferocyte proliferation, apoptotic cell clearance, and plaque stabilization. In view of previous work showing that other types of apoptotic cell cargo can promote resolution in individual efferocytosing macrophages, the findings here suggest that signaling-triggered apoptotic cell-derived nucleotides can amplify this benefit by increasing the number of these macrophages.

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Crossref · 10.1016/j.cmet.2021.10.015

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  • EIMP expands the pool of reparative macrophages, enhancing their capacity for continual apoptotic cell clearance and tissue resolution, and may underlie the sustained reparative capacity of MerTK+ macrophages.

    “This expands the pool of reparative macrophages, enhancing their capacity for continual apoptotic cell clearance and tissue resolution, and may underlie the sustained reparative capacity exhibited by MerTK+ macrophages (46).”

    From Macrophage duality in liver diseases: heterogeneity, plasticity, and the quest for precision therapeutics (2026) · cites this paper as [46]

    The Discussion (page unavailable) says EIMP expands a pool of macrophages competent at continual efferocytosis and pro-resolving activity, and links that expansion to improved apoptotic-cell clearance and resolution. The Results (page unavailable) identify MerTK signaling as one contributor to EIMP, but the paper does not establish sustained reparative capacity specifically in MerTK+ macrophages. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • This approach can harness EIMP, which stabilizes a reparative phenotype via the DNase2a-DNA-PKcs-mTORC2-Myc axis.

    “Mechanistically, this approach can harness pathways such as EIMP, which stabilizes a reparative phenotype via the DNase2a-DNA-PKcs-mTORC2-Myc axis (46).”

    From Macrophage duality in liver diseases: heterogeneity, plasticity, and the quest for precision therapeutics (2026) · cites this paper as [46]

    The Results (page unavailable) support the Dnase2a–DNA-PKcs–mTORC2–Myc pathway as a driver of efferocytosis-induced macrophage proliferation. The Discussion (page unavailable) says this can expand resolving macrophages and promote plaque stabilization, but does not show that the pathway stabilizes a reparative phenotype within macrophages. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Previous research suggests a role for lipid metabolism in TAM-mediated efferocytosis.

    “This aligns with previous research suggesting a role for lipid metabolism in TAM-mediated efferocytosis.”

    From Macrophage efferocytosis mediated by the TP63-RAC2 pathway promotes immunosuppressive remodeling in esophageal cancer (2026) · cites this paper as [16]

    The Introduction and Discussion describe lipids from apoptotic cells as contributors to pathways in efferocytosing macrophages. The copy does not establish that lipid metabolism has this role specifically in TAM-mediated efferocytosis; its MerTK results address macrophage proliferation and efferocytosis, not a lipid-metabolism link. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Efferocytosis triggers macrophage proliferation through a defined DNase2a-DNA-PKcs-mTORC2-Myc pathway, termed efferocytosis-induced macrophage proliferation (EIMP).

    “Complementing this rapid functional rewiring, efferocytosis itself can trigger macrophage proliferation through a defined DNase2a–DNA-PKcs–mTORC2–Myc pathway — a process termed efferocytosis-induced macrophage proliferation (EIMP).”

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Authors
Gerlach, B. D., Ampomah, P. B., Yurdagul, A., Liu, C., Lauring, M. C., Wang, X., Kasikara, C., Kong, N., Shi, J., Tao, W., & Tabas, I.
Affiliations
  • Columbia University Irving Medical Center (US)
  • Brigham and Women's Hospital (US)
Corresponding author
Tabas, Ira
Venue
Cell Metabolism
Publisher
Elsevier BV
Published
2021-12
Volume
33
Issue
12
Pages
2445-2463.e8
ISSN
1550-4131 (ISSN-L)
OpenAlex
W3212263362
Cited by
360
References
71
Citations by year
2026: 79 · 2025: 105 · 2024: 91 · 2023: 53 · 2022: 31 · 2021: 1
FWCI
16.70
Type
journal article
Language
en
Open access
Locations
  • Cell Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (R35 HL145228, K99 HL145131, P20 GM121307, P30CA013696, R01 HL087123, R01 HL127464, S10OD020056, S10RR025686, S10RR027050, T32 5T32HL007343-42)
  • American Heart Association (20POST35210962)
  • Harvard Medical School (122829)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
Keywords
efferocytosis, macrophage proliferation, DNA-PKcs, mTORC2, Rictor, c-Myc, atherosclerosis regression, plaque stabilization, peritonitis, thymocyte apoptosis, phagolysosomes
MeSH terms
Animals, Macrophages, Mice, Inbred C57BL, Phagocytosis, Apoptosis, Cell Proliferation, Mice

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