Cited by 85Cellular Mechanics and InteractionsPhagocytosis and Immune RegulationCellular transport and secretion

Phagocytic ‘teeth’ and myosin-II ‘jaw’ power target constriction during phagocytosis

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Vorselen, Daan, Barger, Sarah R, Wang, Yifan, Cai, Wei, Theriot, Julie A, Gauthier, Nils C, Krendel, Mira·2021·eLife

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Abstract

Phagocytosis requires rapid actin reorganization and spatially controlled force generation to ingest targets ranging from pathogens to apoptotic cells. How actomyosin activity directs membrane extensions to engulf such diverse targets remains unclear. Here, we combine lattice light-sheet microscopy (LLSM) with microparticle traction force microscopy (MP-TFM) to quantify actin dynamics and subcellular forces during macrophage phagocytosis. We show that spatially localized forces leading to target constriction are prominent during phagocytosis of antibody-opsonized targets. This constriction is largely driven by Arp2/3-mediated assembly of discrete actin protrusions containing myosin 1e and 1f (‘teeth’) that appear to be interconnected in a ring-like organization. Contractile myosin-II activity contributes to late-stage phagocytic force generation and progression, supporting a specific role in phagocytic cup closure. Observations of partial target eating attempts and sudden target release via a popping mechanism suggest that constriction may be critical for resolving complex in vivo target encounters. Overall, our findings present a phagocytic cup shaping mechanism that is distinct from cytoskeletal remodeling in 2D cell motility and may contribute to mechanosensing and phagocytic plasticity.

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Authors
Vorselen, D., Barger, S. R., Wang, Y., Cai, W., Theriot, J. A., Gauthier, N. C., & Krendel, M.
Affiliations
  • Howard Hughes Medical Institute (US)
  • SUNY Upstate Medical University (US)
  • Stanford University (US)
  • Department of Mechanical Engineering, Stanford University
  • IFOM (IT)
Corresponding author
  • Theriot, Julie A
  • Krendel, Mira
Venue
eLife
Published
2021-10-28
Volume
10
ISSN
2050-084X (ISSN-L)
OpenAlex
W3210478861
Cited by
85
References
96
Citations by year
2026: 19 · 2025: 21 · 2024: 15 · 2023: 14 · 2022: 15 · 2021: 1
FWCI
5.87
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • American Heart Association (Predoctoral fellowship 18PRE34070066)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK083345)
  • Associazione Italiana per la Ricerca sul Cancro (Investigator Grant 20716)
  • Howard Hughes Medical Institute
  • Cancer Research Institute (CRI Irvington fellowship)
  • National Institute of General Medical Sciences (R01GM138652)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
phagocytosis, myosin II, Arp2/3 complex, actin protrusions, macrophages, membrane tension, lattice light-sheet microscopy, mechanosensing
MeSH terms
RAW 264.7 Cells, Actins, Animals, Bone Marrow Cells, Cytoskeleton, Humans, Macrophages, Mice, Inbred C57BL, Microscopy, Phagocytosis, Stem Cells, HL-60 Cells, Myosin Type II, Mice, Molecular Imaging

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