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. 1988 Dec;85(23):8875–8879. doi: 10.1073/pnas.85.23.8875

Adenosine regulates the Ca2+ sensitivity of mast cell mediator release.

M J Lohse 1, K N Klotz 1, M J Salzer 1, U Schwabe 1
PMCID: PMC282609  PMID: 2461558

Abstract

Mast cells release histamine and other mediators of allergy in response to stimulation of their IgE receptors. This release is generally thought to be mediated by an elevation of cytosolic Ca2+. Recent evidence suggests that there might be factors that modulate the coupling between Ca2+ levels and mediator release. The present report identifies adenosine as one such modulator. Adenosine and several of its metabolically stable analogues were shown to enhance histamine release from rat peritoneal mast cells in response to stimuli such as concanavalin A. Metabolizing endogenous adenosine with adenosine deaminase dampened the response to stimuli, whereas trapping endogenous adenosine inside mast cells with nucleoside-transport inhibitors markedly enhanced stimulated histamine release. The metabolically stable adenosine analogue 5'-(N-ethylcarboxamido)adenosine (NECA) did not affect the initial steps in the sequence from IgE-receptor activation to mediator release, which are generation of inositol trisphosphate and increase of cytosolic Ca2+. However, NECA did enhance the release induced in ATP-permeabilized cells by exogenous Ca2+, but it had no effect on the release induced by phorbol esters. These data suggest that adenosine sensitizes mediator release by a mechanism regulating stimulus-secretion coupling at a step distal to receptor activation and second-messenger generation.

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Selected References

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