MicroRNA-34a Negatively Regulates Efferocytosis by Tissue Macrophages in Part via SIRT1
Open accessAbstract
Apoptotic cell (AC) clearance (efferocytosis) is an evolutionarily conserved process essential for immune health, particularly to maintain self-tolerance. Despite identification of many recognition receptors and intracellular signaling components of efferocytosis, its negative regulation remains incompletely understood and has not previously been known to involve microRNAs (miRs). In this article, we show that miR-34a (gene ID 407040), well recognized as a p53-dependent tumor suppressor, mediates coordinated negative regulation of efferocytosis by resident murine and human tissue macrophages (Mø). The miR-34a expression varied greatly between Mø from different tissues, correlating inversely with their capacity for AC uptake. Transient or genetic knockdown of miR-34a increased efferocytosis, whereas miR-34a overexpression decreased efferocytosis, without altering recognition of live, necrotic, or Ig-opsonized cells. The inhibitory effect of miR-34a was mediated both by reduced expression of Axl, a receptor tyrosine kinase known to recognize AC, and of the deacetylase silent information regulator T1, which had not previously been linked to efferocytosis by tissue Mø. Exposure to AC downregulated Mø miR-34a expression, resulting in a positive feedback loop that increased subsequent capacity to engulf AC. These findings demonstrate that miR-34a both specifically regulates and is regulated by efferocytosis. Given the ability of efferocytosis to polarize ingesting Mø uniquely and to reduce their host-defense functions, dynamic negative regulation by miR-34a provides one means of fine-tuning Mø behavior toward AC in specific tissue environments with differing potentials for microbial exposure.
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miR-34a negatively regulates efferocytosis via SIRT1.
“MicroRNA-34a negatively regulates efferocytosis via SIRT1 [133].”
From MicroRNAs as Regulators of Phagocytosis (2022) · cites this paper as [133]
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1 retracted
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“Alternatively, increased SIRT1 as a consequence of miR34a downregulation might also activate portions of the autophagy machinery, recently shown to be shared with efferocytosis (90).”
BackgroundRetractedThe Widespread Impact of Mammalian MicroRNAs on mRNA Repression and Evolution
Farh, K. K.-H., Grimson, A., Jan, C., Lewis, B. P., Johnston, W. K., Lim, L. P., Burge, C. B., & Bartel, D. P. (2005) · Science · doi:10.1126/science.1121158 · Cited by 1,484 · see citing works
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“The current findings extend the activities of miR-34a, well known for its key role as a p53-dependent tumor suppressor that blocks cell division in normal and malignant cells and induces apoptosis in response to genotoxic stress (73).”
BackgroundApoptotic Body Engulfment by a Human Stellate Cell Line Is Profibrogenic
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MicroRNAs as Regulators of Phagocytosis
Gierlikowski, W., & Gierlikowska, B. (2022) · Cells · doi:10.3390/cells11091380 · Cited by 25 · see citing works
- Authors
- McCubbrey, A. L., Nelson, J. D., Stolberg, V. R., Blakely, P. K., McCloskey, L., Janssen, W. J., Freeman, C. M., & Curtis, J. L.
- Affiliations
- Michigan Medicine (US)
- VA Ann Arbor Healthcare System (US)
- National Jewish Health (US)
- Corresponding author
- Curtis, Jeffrey L
- ORCID
- Venue
- The Journal of Immunology
- Publisher
- Oxford University Press (OUP)
- Published
- 2016-02-01
- Volume
- 196
- Issue
- 3
- Pages
- 1366-1375
- ISSN
- 0022-1767 (ISSN-L)
- 1550-6606
- PMC
- PMC4724467
- OpenAlex
- W2222799219
- Cited by
- 40
- References
- 5
- Citations by year
- 2026: 2 · 2025: 5 · 2024: 1 · 2023: 6 · 2022: 4 · 2021: 4 · 2020: 4 · 2019: 5 · 2018: 3 · 2017: 4 · 2016: 2
- FWCI
- 1.48
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Journal of Immunology (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- U.S. Department of Veterans Affairs (I01 CX000911, U01 HL098961, CX000911, BX001389, I01 BX001389)
- National Institutes of Health (5t32ai007413-32, VA999999)
- U.S. Public Health Service
- National Heart, Lung, and Blood Institute (U01HL098961, R01HL109517)
- National Institute of Allergy and Infectious Diseases (T32-AI-007413)
- Topics
- Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Keywords
- miR-34a, efferocytosis, tissue macrophages, SIRT1, AXL receptor, receptor tyrosine kinase, macrophage polarization, positive feedback loop, self-tolerance
- MeSH terms
- Animals, Flow Cytometry, Humans, Macrophages, Mice, Inbred C57BL, Phagocytosis, Transfection, Apoptosis, Reverse Transcriptase Polymerase Chain Reaction, MicroRNAs, Mice, Gene Knockdown Techniques, Sirtuin 1
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