CD47 promotes both phosphatidylserine-independent and phosphatidylserine-dependent phagocytosis of apoptotic murine thymocytes by non-activated macrophages
Abstract
The ubiquitously expressed cell surface glycoprotein CD47 on host cells can inhibit phagocytosis of unopsonized or opsonized viable host target cells. Here we studied the role of target cell CD47 in macrophage uptake of viable or apoptotic murine thymocytes. As expected, IgG-opsonized viable CD47(-/-) thymocytes were taken up more efficiently than equally opsonized Wt thymocytes. However IgG-opsonized apoptotic thymocytes from Wt and CD47(-/-) mice were taken up equally. Although uptake of apoptotic thymocytes by non-activated bone marrow-derived macrophages was phosphatidylserine (PS)-independent, while uptake by non-activated resident peritoneal macrophages was PS-dependent, both macrophage populations showed a reduced uptake of non-opsonized apoptotic CD47(-/-) thymocytes, as compared with the uptake of apoptotic Wt thymocytes. This difference was only seen with non-activated macrophages, and not with beta-1,3-glucan-activated macrophages. CD47 promoted binding of thymocytes to macrophages, which did not require F-actin polymerization. CD47 became clustered on apoptotic thymocytes, both co-localized with or separated from, clustered PS and cholesterol-rich GM-1 domains. Thus, CD47 does not inhibit, but rather support, both PS-independent and PS-dependent uptake of apoptotic cells in the murine system. This mechanism only comes into play in non-activated macrophages.
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CD47 is required for efficient phagocytic uptake of some murine cell lines undergoing RCD.
“That said, CD47 appears to be required for the efficient phagocytic uptake of some murine cell lines undergoing RCD [892, 893].”
From Molecular mechanisms of cell death: recommendations of the nomenclature committee on cell death 2018. (2018) · cites this paper as [893]
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- Authors
- Nilsson, A., & Oldenborg, P.-A.
- Affiliations
- Umeå University (SE)
- Corresponding author
- Oldenborg, Per-Arne
- ORCID
- Oldenborg, Per-Arne
- Venue
- Biochemical and Biophysical Research Communications
- Publisher
- Elsevier BV
- Published
- 2009-09
- Volume
- 387
- Issue
- 1
- Pages
- 58-63
- ISSN
- 0006-291X (ISSN-L)
- OpenAlex
- W2120672597
- Cited by
- 37
- References
- 26
- Citations by year
- 2026: 1 · 2025: 2 · 2023: 1 · 2022: 4 · 2021: 2 · 2020: 1 · 2019: 5 · 2018: 3 · 2017: 1 · 2016: 2 · 2015: 1 · 2014: 2 · 2013: 3 · 2012: 3
- FWCI
- 1.29
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Biochemical and Biophysical Research Communications (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Vetenskapsrådet
- Umeå Universitet
- 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 › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Keywords
- CD47, phagocytosis, apoptotic cells, phosphatidylserine, macrophages, thymocytes, opsonization, GM1 ganglioside, cholesterol-rich domains, cell surface glycoproteins, macrophage uptake
- MeSH terms
- Animals, Female, Immunoglobulin G, Macrophage Activation, Macrophages, Mice, Mutant Strains, Phagocytosis, Phosphatidylserines, Thymus Gland, Apoptosis, Protein Structure, Tertiary, Mice, CD47 Antigen
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