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• W1999475384 abstract "The aim of this study was to see whether the compound adenosine 5'-tetraphosphate (Ap(4)) is active in the central nervous system by examining its effect on isolated rat brain synaptic terminals. Ap(4) proved to be more resistant to ecto-enzymatic hydrolysis than adenosine triphosphate (ATP), showing only 2% hydrolysis after a 2-min incubation, compared to 75% for ATP. In addition, Ap(4) was able to produce concentration-dependent increases in intracellular Ca(2+) when applied extracellularly. This action was dependent upon the presence of extracellular calcium. Ap(4) acts through ionotropic ATP receptors (P2X receptors) and not through diadenosine polyphosphate receptors, since ATP abolished the response elicited by Ap(4) whereas Ap(5)A did not. Ap(4), ATP and ATP-gamma-S were of similar potency (EC(50) approximately 20 microM) while 2MeSATP, alpha,beta-meATP and ADP-beta-S possessed slightly lower potency (EC(50) approximately 50 microM). The P2-purinoceptor antagonists suramin and PPADS blocked the Ap(4) effect. The IC(50) values for these compounds were 35.5 and 7.8 microM respectively. Diinosine polyphosphates and inosine tetraphosphate inhibited the response elicited by Ap(4) with IC(50) values that varied between approximately 40 and 50 microM. These results show that Ap(4) is as good an agonist as ATP on synaptosomal P2X receptors, being more resistant to extracellular hydrolysis by ecto-nucleotidases." @default.
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• W1999475384 date "2000-11-01" @default.
• W1999475384 modified "2023-09-30" @default.
• W1999475384 title "Adenosine 5′-tetraphosphate (Ap4), a new agonist on rat midbrain synaptic terminal P2 receptors" @default.
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• W1999475384 doi "https://doi.org/10.1016/s0028-3908(00)00070-8" @default.
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