Cited by 1,347Autophagy in Disease and TherapyImmune Response and InflammationPhagocytosis and Immune Regulation

Toll-like receptor signalling in macrophages links the autophagy pathway to phagocytosis

Sanjuan, Miguel A., Dillon, Christopher P., Tait, Stephen W. G., Moshiach, Simon, Dorsey, Frank, Connell, Samuel, Komatsu, Masaaki, Tanaka, Keiji +3 more·2007·Nature

Abstract

Phagocytosis and autophagy are two ancient, highly conserved processes involved, respectively, in the removal of extracellular organisms and the destruction of organisms in the cytosol. Autophagy, for either metabolic regulation or defence, involves the formation of a double membrane called the autophagosome, which then fuses with lysosomes to degrade the contents, a process that has similarities with phagosome maturation. Toll-like-receptor (TLR) engagement activates a variety of defence mechanisms within phagocytes, including facilitation of phagosome maturation, and also engages autophagy. Therefore we speculated that TLR signalling might link these processes to enhance the function of conventional phagosomes. Here we show that a particle that engages TLRs on a murine macrophage while it is phagocytosed triggers the autophagosome marker LC3 to be rapidly recruited to the phagosome in a manner that depends on the autophagy pathway proteins ATG5 and ATG7; this process is preceded by recruitment of beclin 1 and phosphoinositide-3-OH kinase activity. Translocation of beclin 1 and LC3 to the phagosome was not associated with observable double-membrane structures characteristic of conventional autophagosomes, but was associated with phagosome fusion with lysosomes, leading to rapid acidification and enhanced killing of the ingested organism.

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Crossref · 10.1038/nature06421

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  • Proteomics analysis of purified phagosome membranes in cells that have taken up differing cargoes by phagocytosis revealed that absence of TLR signaling leads to failure of LC3 recruitment to phagosome membranes.

    “Proteomics analysis of purified phagosome membranes in cells that have taken up differing cargoes by phagocytosis has revealed that the absence of TLR signaling leads to failure of LC3 recruitment to phagosome membranes [18,39].”
  • In LAP, LC3 is recruited directly to the single-membrane phagosome, distinct from conventional autophagy where LC3 is incorporated into the double-membrane autophagosome.

    “In LAP, distinct from the conventional autophagic pathway where LC3 is incorporated into the double-membrane autophagosome, LC3 is recruited directly to the single-membrane phagosome [12,16,18].”
  • Engulfment of Escherichia coli and yeast by RAW macrophage-like cells expressing GFP-LC3 induced translocation of LC3 to phagosomes within 5 to 10 minutes of internalization.

    “The first report of such recruitment showed that the engulfment of Escherichia coli and yeast by RAW macrophage-like cells expressing GFP-LC3 induced the translocation of LC3 to phagosomes within 5 to 10 minutes of internalization of microorganisms [18].”
  • The newly formed phagosome is rapidly decorated by LC3.

    “The newly formed phagosome is rapidly decorated by LC3 [18] (Figure 2A).”
  • Once engulfed, entotic cells are often eliminated by a RCD subroutine independent of BCL2 proteins and caspases, but relying at least in part on LC3-associated phagocytosis.

    “Once engulfed, entotic cells are often eliminated by a RCD subroutine that occurs independently of BCL2 proteins and caspases [694, 704], but relies (at least in part) on a specific autophagy-related process commonly known as LC3-associated phagocytosis (LAP) [509, 705, 706].”

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Authors
Sanjuan, M. A., Dillon, C. P., Tait, S. W. G., Moshiach, S., Dorsey, F., Connell, S., Komatsu, M., Tanaka, K., Cleveland, J. L., Withoff, S., & Green, D. R.
Affiliations
  • St. Jude Children's Research Hospital (US)
  • Tokyo Metropolitan Institute of Medical Science (JP)
  • Scripps Research Institute (US)
Corresponding author
Green, Douglas R.
Venue
Nature
Published
2007-12
Volume
450
Issue
7173
Pages
1253-1257
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2088140877
Cited by
1,347
References
30
Citations by year
2026: 34 · 2025: 63 · 2024: 67 · 2023: 61 · 2022: 79 · 2021: 83 · 2020: 88 · 2019: 77 · 2018: 85 · 2017: 85 · 2016: 104 · 2015: 75 · 2014: 79 · 2013: 91 · 2012: 79
FWCI
33.01
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) (submittedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
Toll-like receptor signaling, macrophages, autophagy, phagocytosis, phagosome maturation, autophagosomes, LC3, ATG5, ATG7, Beclin-1, phosphatidylinositol 3-kinase, lysosome fusion, phagosome acidification, pathogen killing, innate immunity
MeSH terms
Beclin-1, Autophagy-Related Protein 5, Autophagy-Related Protein 7, Animals, Autophagy, Macrophages, Microtubule-Associated Proteins, Phagosomes, Proteins, Saccharomyces cerevisiae, Signal Transduction, Phosphatidylinositol 3-Kinases, Apoptosis Regulatory Proteins, Toll-Like Receptors, Toll-Like Receptor 2, Mice

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