Cited by 342Complement system in diseasesPhagocytosis and Immune RegulationBiomarkers in Disease Mechanisms

Macrophage complement receptors and pathogen clearance

Open access
van Lookeren Campagne, Menno, Wiesmann, Christian, Brown, Eric J.·2007·Cellular Microbiology

Abstract

Phagocytosis, an important mechanism of the host-defence system and a primary function of macrophages, is facilitated by opsonization, a process by which serum components tag pathogens for recognition by neutrophils and macrophages. Complement component C3 is central to opsonization. Its first cleavage product, C3b, forms the multisubunit enzyme, C3bBb, which proteolytically cleaves additional C3 molecules on the pathogen surface. C3b is further degraded to iC3b, C3c and C3dg, products that serve as ligands for selective complement receptors on leukocytes. This receptor-ligand interaction subsequently modulates immune responses or directly targets the pathogen for clearance by phagocytosis. Although a central role for C3 in phagocytosis of certain pathogens is well accepted, the receptors orchestrating the phagocytic response have not been well characterized. The recent structures of C3 and its breakdown products have increased our insights into the molecular basis of complement activation and recognition by their receptors. Here we review the biology of macrophage receptors for C3 fragments and discuss their role in the host response to pathogens.

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 · 10.1111/j.1462-5822.2007.00981.x

Cites

65 of 65 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?

  • In the immune system, C3 is cleaved into an activated form, iC3b, which covalently binds to the surface of cells or debris and targets them for elimination by macrophages via specific phagocytic receptor signaling (e.g., CR3).

    “In the immune system, C3 is cleaved into an activated form, iC3b, which covalently binds to the surface of cells or debris and targets them for elimination by macrophages via specific phagocytic receptor signaling (e.g., CR3) (Lambris and Tsokos, 1986; van Lookeren Campagne et al., 2007).”

    From Microglia Sculpt Postnatal Neural Circuits in an Activity and Complement-Dependent Manner (2012) · cites this paper as van Lookeren Campagne et al., 2007

    The “Complement C3 opsonization” section says C3 is first cleaved to C3b, which covalently binds a surface; subsequent cleavage of bound C3b produces iC3b. The receptor sections support iC3b recognition and phagocytosis through CR3, but the claim incorrectly presents iC3b as the direct product of C3 cleavage and the form that initially binds covalently. The discussion of cell-debris removal identifies CRIg as a possible receptor, rather than specifically CR3. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Anaphylatoxin C3a and C5a function as chemoattractants for neutrophils, macrophages, astrocytes, and microglia.

    “Anaphylatoxin C3a and C5a—downstream products of the complement pathway [211]—function as chemoattractants for neutrophils [212], macrophages [213], astrocytes [214], and microglia [215–217] (Fig. 4B&G).”

    From Oligodendrocyte death and myelin loss in the cuprizone model: an updated overview of the intrinsic and extrinsic causes of cuprizone demyelination (2022) · cites this paper as [213]

    Citation [213] is attached specifically to macrophages. The ‘Complement C3 opsonization’ section identifies C3a as a product of C3 cleavage, and ‘The role of CR3 and CRIg in complement-mediated phagocytosis’ discusses macrophage receptors and leukocyte trafficking. Neither passage says that C3a or C5a attracts macrophages; searches for C5a, chemotaxis, and anaphylatoxin-mediated recruitment found no such statement. Page numbers were not available in our copy. (LLM, conf=0.75)

    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

1 retracted

Flagged first, then by citations

2 of the 67 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
van Lookeren Campagne, M., Wiesmann, C., & Brown, E. J.
Affiliations
Genentech (US)
Venue
Cellular Microbiology
Published
2007-09
Volume
9
Issue
9
Pages
2095-2102
ISSN
  • 1462-5814 (ISSN-L)
  • 1462-5822
OpenAlex
W2007658022
Cited by
332
References
67
Citations by year
2026: 9 · 2025: 13 · 2024: 14 · 2023: 23 · 2022: 15 · 2021: 18 · 2020: 27 · 2019: 18 · 2018: 9 · 2017: 25 · 2016: 17 · 2015: 22 · 2014: 20 · 2013: 19 · 2012: 20
FWCI
1.17
Type
journal article
Language
en
Open access
Locations
  • Cellular Microbiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Biomarkers in Disease Mechanisms
Keywords
complement C3, opsonization, phagocytosis, C3b, iC3b, C3dg, C3c, complement activation, pathogen clearance, host defense, ligand-receptor interactions
MeSH terms
Complement Activation, Complement C3, Macrophages, Models, Molecular, Opsonin Proteins, Phagocytosis, Protein Conformation, Receptors, Complement, Protein Isoforms

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