Cited by 322Phagocytosis and Immune RegulationCell death mechanisms and regulationAutophagy in Disease and Therapy

A novel method to determine the engulfment of apoptotic cells by macrophages using pHrodo succinimidyl ester

Open access
Miksa, Michael, Komura, Hidefumi, Wu, Rongqian, Shah, Kavin G., Wang, Ping·2009·Journal of Immunological Methods

Abstract

Apoptotic cell phagocytosis has recently raised considerable interest, particularly due to its intricate molecular mechanisms and negative immunologic impact of incompetent clearance of apoptotic cells. There is a need for simple and reliable methods to clearly determine the internalization of apoptotic cells. Labeling with pHrodo succinimidyl ester (SE), a pH-sensitive fluorescent dye, makes engulfed apoptotic cells detectable due to the increased post-phagocytic light emission. This is a valuable tool for phagocytosis studies via FACS. We designed an ex vivo assay, using apoptotic pHrodo-labeled lymphocytes as prey and anti-CD11b-labeled tissue macrophages. To demonstrate its validity of detecting internalized apoptotic lymphocytes, we used MFGE8(-/-) macrophages, known to have impaired phagocytic ability. Uptake of apoptotic lymphocytes was accelerated and enhanced in splenic macrophages after stimulation with recombinant MFGE8, while peritoneal macrophages were able to compensate for the delayed uptake. This novel assay is a quick and reliable method to evaluate the internalization of apoptotic cells.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/j.jim.2008.11.019

Cites

15 of 15 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • pHrodo only fluoresces once it enters acidic compartments of lysosomes, so pHrodo-positive fluorescence within microglia confirms phagocytosis of RGC inputs.

    “Because pHrodo only fluoresces once it enters acidic compartments of lysosomes, any pHrodo-positive fluorescence within a microglia confirms phagocytosis of RGC inputs.”

    From Microglia Sculpt Postnatal Neural Circuits in an Activity and Complement-Dependent Manner (2012) · cites this paper as Miksa et al., 2009

    The Results (page not provided) show that pHrodo-labeled cells become much brighter after macrophage engulfment as phagosomes acidify. But the paper also reports dim fluorescence before engulfment, so “only fluoresces once” is too absolute; it tests macrophages engulfing apoptotic cells, not microglia engulfing RGC inputs. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

1 of the 16 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Miksa, M., Komura, H., Wu, R., Shah, K. G., & Wang, P.
Affiliations
Feinstein Institute for Medical Research (US)
Corresponding author
Wang, Ping
Venue
Journal of Immunological Methods
Publisher
Elsevier BV
Published
2009-03
Volume
342
Issue
1-2
Pages
71-77
ISSN
0022-1759 (ISSN-L)
OpenAlex
W2100326315
Cited by
320
References
16
Citations by year
2026: 11 · 2025: 14 · 2024: 23 · 2023: 12 · 2022: 17 · 2021: 39 · 2020: 15 · 2019: 19 · 2018: 26 · 2017: 25 · 2016: 23 · 2015: 32 · 2014: 19 · 2013: 15 · 2012: 7
FWCI
4.31
Type
journal article
Language
en
Open access
Locations
  • Journal of Immunological Methods (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Aging (R01AG028352)
  • National Institute of General Medical Sciences (R01GM053008, R01GM057468)
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
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
phagocytosis of apoptotic cells, macrophages, pH-sensitive fluorescent dye, efferocytosis, MFG-E8, splenic macrophages, peritoneal macrophages, lymphocytes
MeSH terms
Animals, Flow Cytometry, Fluorescent Dyes, Male, Mice, Inbred C57BL, Microscopy, Fluorescence, Phagocytosis, Spleen, Succinimides, Thymus Gland, Rats, Sprague-Dawley, Apoptosis, Macrophages, Peritoneal, Mice, Rats

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review