Coordinated oscillations in cortical actin and Ca2+ correlate with cycles of vesicle secretion
Open accessAbstract
The actin cortex both facilitates and hinders the exocytosis of secretory granules. How cells consolidate these two opposing roles was not well understood. Here we show that antigen activation of mast cells induces oscillations in Ca(2+) and PtdIns(4,5)P(2) lipid levels that in turn drive cyclic recruitment of N-WASP and cortical actin level oscillations. Experimental and computational analysis argues that vesicle fusion correlates with the observed actin and Ca(2+) level oscillations. A vesicle secretion cycle starts with the capture of vesicles by actin when cortical F-actin levels are high, followed by vesicle passage through the cortex when F-actin levels are low, and vesicle fusion with the plasma membrane when Ca(2+) levels subsequently increase. Thus, cells employ oscillating levels of Ca(2+), PtdIns(4,5)P(2) and cortical F-actin to increase secretion efficiency, explaining how the actin cortex can function as a carrier as well as barrier for vesicle secretion.
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A dense ring of branched actin surrounds the cytosol, creating a barrier at the cell cortex that regulates vesicle secretion.
“Additionally, a dense ring of branched actin surrounds the cytosol, creating a barrier at the cell cortex that regulates vesicle secretion [11–13].”
From HEM1 Actin Immunodysregulatory Disorder: Genotypes, Phenotypes, and Future Directions (2022) · cites this paper as [13]
The Abstract describes a peripheral actin cortex that acts as a mechanical barrier to secretory vesicles, and the Results show that changing cortical actin affects secretion. Our copy does not describe it as a dense ring of branched actin surrounding the cytosol, so those structural details are unsupported. (LLM, conf=0.85)
Experimental — accuracy not yet measuredA dense ring of cortical branched actin below the cell membrane is a barrier that mechanically inhibits nonspecific vesicle fusion, thereby allowing for coordinated exocytosis.
“A dense ring of cortical branched actin below the cell membrane is a barrier that mechanically inhibits nonspecific vesicle fusion, thereby allowing for coordinated exocytosis (Fig. 1c) [11, 13, 21].”
From HEM1 Actin Immunodysregulatory Disorder: Genotypes, Phenotypes, and Future Directions (2022) · cites this paper as [13]
The Discussion describes cortical actin as a barrier to secretory granules reaching the plasma membrane and suggests that it minimizes inadvertent secretion. The paper also links actin oscillations to coordinated vesicle capture, passage and fusion. It does not describe a dense ring of branched actin or say that the barrier directly inhibits nonspecific vesicle fusion; its stated barrier mechanism is restricted access to the membrane. (LLM, conf=0.85)
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Research works printed but not linked: 30
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Morrell, A. E., Brown, G. N., Robinson, S. T., Sattler, R. L., Baik, A. D., Zhen, G., Cao, X., Bonewald, L. F., Jin, W., Kam, L. C., et al. (2018) · Bone Research · doi:10.1038/s41413-018-0007-x · Cited by 184 · see citing works
HEM1 Actin Immunodysregulatory Disorder: Genotypes, Phenotypes, and Future Directions
Cook, S., Lenardo, M. J., & Freeman, A. F. (2022) · Journal of Clinical Immunology · doi:10.1007/s10875-022-01327-0 · Cited by 24 · see citing works
- Authors
- Wollman, R., & Meyer, T.
- Affiliations
- Stanford University (US)
- Corresponding author
- Meyer, T.
- ORCID
- Venue
- Nature Cell Biology
- Published
- 2012-11-11
- Volume
- 14
- Issue
- 12
- Pages
- 1261-1269
- ISSN
- 1465-7392 (ISSN-L)
- 1476-4679
- PMC
- PMC3777337
- OpenAlex
- W1968393860
- Cited by
- 119
- References
- 0
- Citations by year
- 2026: 4 · 2025: 3 · 2024: 6 · 2023: 2 · 2022: 7 · 2021: 13 · 2020: 5 · 2019: 6 · 2018: 10 · 2017: 11 · 2016: 18 · 2015: 15 · 2014: 12 · 2013: 7
- FWCI
- 4.80
- Type
- journal article
- Language
- en
- Open access
- green
- europepmc.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature Cell Biology (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- National Institutes of Health
- National Institute of Mental Health (R01MH064801, MH 064801)
- National Institute of General Medical Sciences (R01GM048113, GM030179, R01GM063702, R01GM030179)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Keywords
- cortical actin, calcium oscillations, phosphatidylinositol 4,5-bisphosphate, N-WASP, vesicle secretion, exocytosis, mast cells, antigen stimulation, F-actin polymerization, vesicle fusion, secretory granules
- MeSH terms
- Actins, Calcium, Egtazic Acid, Exocytosis, Humans, Phosphatidylinositol 4,5-Diphosphate, Thapsigargin, Cell Line, Tumor
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