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1 Unité de Biologie des
Interactions Cellulaires,
Macrophages and
thymocytes express
P2Z/P2X7
nucleotide receptors that bind extracellular ATP. These receptors play
a role in immune development and control of microbial infections, but their presence on dendritic cells has not been reported. We
investigated whether extracellular ATP could trigger
P2Z/P2X7
receptor-dependent apoptosis of dendritic cells. Apoptosis could be
selectively triggered by tetrabasic ATP, since other
purine/pyrimidine nucleotides were ineffective, and it was
mimicked by the P2Z receptor
agonist, benzoylbenzoyl ATP, and blocked by magnesium and the
irreversible antagonist, oxidized ATP. RT-PCR analysis confirmed the
mRNA expression of the
P2Z/P2X7
receptor and the absence of P2X1.
Caspase inhibitors and cycloheximide had only a partial effect on the
apoptosis, suggesting that a caspase-independent mechanism may also be
operative. Brief treatment with ATP led to an increase in the
intracellular calcium concentration and permeabilization of the plasma
membrane to Lucifer yellow, which diffused throughout the dendritic
cell cytosol. Other small extracellular molecules may thus attain a similar intracellular distribution, perhaps activating endogenous proteases that contribute to initiation of apoptosis.
adenosine 5'-triphosphate; inflammatory mediators
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