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. 1990 Nov;87(21):8267–8271. doi: 10.1073/pnas.87.21.8267

Extracellular ATP in T-lymphocyte activation: possible role in effector functions.

A Filippini 1, R E Taffs 1, M V Sitkovsky 1
PMCID: PMC54936  PMID: 2146684

Abstract

We hypothesized that cytolytic T lymphocytes (CTL) may utilize extracellular ATP (ATPo) during the effector phase of the CTL-target cell interactions and that CTL could be the source of ATPo. It is demonstrated here that incubation of CTL with activating ligands [Con A or monoclonal antibody (mAb) to the T-cell antigen receptor (TCR)] results in the extracellular Ca2(+)-independent accumulation of the ATPo. The addition of the ATP-degrading enzymes into the mixture of CTL and target cells results in a strong inhibition of the CTL-mediated, TCR-triggered lethal-hit delivery to the target cell. In a parallel control experiment, the employed enzymes did not affect target cell-induced, TCR-triggered exocytosis of granules from CTL. Thus, the removal of ATPo with enzymes does not interfere with the activation of CTL by the target cell but does block lytic events. Cloned helper T lymphocytes also accumulate ATPo after incubation with anti-TCR mAb or Con A, suggesting the possibility that ATPo, which acts in concert with ectoprotein kinases and/or purinergic receptors, may be of general use as a messenger in cellular interactions of T lymphocytes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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