Whereas adenosine 5’-triphosphate (ATP) is the major energy source in cells, extracellular ATP (eATP) released from activated/damaged cells is widely thought to represent a potent damage-associated molecular pattern that promotes inflammatory responses. Here, we provide suggestive evidence that eATP is constitutively produced in the uninflamed lymph node (LN) paracortex by naïve T cells responding to C-C chemokine receptor type 7 (CCR7) ligand chemokines. Consistently, eATP was markedly reduced in naïve T cell-depleted LNs, including those of nude mice, CCR7-deficient mice, and mice subjected to the interruption of the afferent lymphatics in local LNs. Stimulation with a CCR7 ligand chemokine, CCL19, induced ATP release from LN cells, which inhibited CCR7-dependent lymphocyte migration in vitro by a mechanism dependent on the purinoreceptor P2X7 (P2X7R), and P2X7R inhibition enhanced T cell retention in LNs in vivo. These results collectively indicate that paracortical eATP is produced by naïve T cells in response to constitutively expressed chemokines, and that eATP negatively regulates CCR7-mediated lymphocyte migration within LNs via a specific subtype of ATP receptor, demonstrating its fine-tuning role in homeostatic cell migration within LNs.
Extracellular ATP Limits Homeostatic T Cell Migration Within Lymph Nodes
D. Kobayashi,Y. Sugiura,E. Umemoto,A. Takeda,H. Ueta,Haruko Hayasaka,S. Matsuzaki,T. Katakai,M. Suematsu,I. Hamachi,G. Yegutkin,M. Salmi,S. Jalkanen,M. Miyasaka
Published 2021 in Frontiers in Immunology
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- Publication year
2021
- Venue
Frontiers in Immunology
- Publication date
2021-12-22
- Fields of study
Biology, Medicine
- Identifiers
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- Source metadata
Semantic Scholar, PubMed
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