Cited by 596Adenosine and Purinergic SignalingNeuroinflammation and Neurodegeneration MechanismsExtracellular vesicles in disease

Astrocyte-Derived ATP Induces Vesicle Shedding and IL-1β Release from Microglia

Bianco, Fabio, Pravettoni, Elena, Colombo, Alessio, Schenk, Ursula, Möller, Thomas, Matteoli, Michela, Verderio, Claudia·2005·The Journal of Immunology

Abstract

ATP has been indicated as a primary factor in microglial response to brain injury and inflammation. By acting on different purinergic receptors 2, ATP is known to induce chemotaxis and stimulate the release of several cytokines from these cells. The activation of purinergic receptors 2 in microglia can be triggered either by ATP deriving from dying cells, at sites of brain injury or by ATP released from astrocytes, in the absence of cell damage. By the use of a biochemical approach integrated with video microscopy experiments, we investigated the functional consequences triggered in microglia by ATP released from mechanically stimulated astrocytes, in mixed glial cocultures. Astrocyte-derived ATP induced in nearby microglia the formation and the shedding of membrane vesicles. Vesicle formation was inhibited by the ATP-degrading enzyme apyrase or by P2X7R antagonists. Isolation of shed vesicles, followed by IL-1β evaluation by a specific ELISA revealed the presence of the cytokine inside the vesicular organelles and its subsequent efflux into the extracellular medium. IL-1β efflux from shed vesicles was enhanced by ATP stimulation and inhibited by pretreatment with the P2X7 antagonist oxidized ATP, thus indicating a crucial involvement of the pore-forming P2X7R in the release of the cytokine. Our data identify astrocyte-derived ATP as the endogenous factor responsible for microvesicle shedding in microglia and reveal the mechanisms by which astrocyte-derived ATP triggers IL-1β release from these cells.

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Crossref · 10.4049/jimmunol.174.11.7268

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Authors
Bianco, F., Pravettoni, E., Colombo, A., Schenk, U., Möller, T., Matteoli, M., & Verderio, C.
Affiliations
  • University of Milan (IT)
  • Department Of Neurology, University of Washington , Seattle, WA 98195
Venue
The Journal of Immunology
Published
2005-06-01
Volume
174
Issue
11
Pages
7268-7277
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1651376769
Cited by
596
References
46
Citations by year
2026: 13 · 2025: 24 · 2024: 48 · 2023: 34 · 2022: 40 · 2021: 40 · 2020: 42 · 2019: 38 · 2018: 36 · 2017: 28 · 2016: 29 · 2015: 24 · 2014: 26 · 2013: 28 · 2012: 31
FWCI
8.92
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Consiglio Nazionale delle Ricerche
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Adenosine and Purinergic Signaling
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
Keywords
microglia, IL-1β release, P2X7 receptor, purinergic signaling, oxidized ATP, apyrase, neuroinflammation, brain injury
MeSH terms
Adenosine Triphosphate, Animals, Astrocytes, Cell Line, Cell Membrane, Hippocampus, Interleukin-1, Membrane Proteins, Microscopy, Fluorescence, Protein Processing, Post-Translational, Microglia, Receptors, Purinergic P2, Microscopy, Video, Coculture Techniques, Secretory Vesicles, Mice, Rats, Receptors, Purinergic P2X7

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