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- W2056544336 abstract "1. Currents through heteromeric P2X(2/3) receptors were evoked by applying alpha,beta-methylene-ATP to human embryonic kidney cells transfected with cDNAs encoding the P2X(2) and P2X(3) subunits. The concentration of alpha,beta-methylene-ATP were < or =30 microM because higher concentrations can activate homomeric P2X(2) receptors. The kinetics of action of three structurally unrelated antagonists were studied; these were 2', 3'-O-(2,4,6,trinitrophenyl)-ATP (TNP-ATP), pyridoxal-5-phosphate-6-azophenyl-2',4'-disulphonate (PPADS) and suramin. The association and dissociation rate constants were determined by pre-applying the antagonist for various periods prior to the co-application of agonist and antagonist, or by changing the solution from one containing only the agonist to one containing both agonist and antagonist. The high affinity of TNP-ATP for the P2X(2/3) receptor (K(D) approximately 2 nM) results from fast binding (k(+1) approximately 100 microM(-1) s(-1)) rather than slow unbinding (k(-1) approximately 0.3 s(-1)). For suramin (K(D) approximately 1 microM) the association rate constant ( approximately 1 microM(-1) s(-1)) was 100 times slower than that of TNP-ATP but the dissociation rate constant was similar (k(-1) approximately 1 s(-1)). PPADS (K(D) approximately 0.1 microM) associated and dissociated some 100 - 10,000 times more slowly than the other antagonists." @default.
- W2056544336 created "2016-06-24" @default.
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- W2056544336 date "2002-03-01" @default.
- W2056544336 modified "2023-09-26" @default.
- W2056544336 title "Kinetics of antagonist actions at rat P2X<sub>2/3</sub> heteromeric receptors" @default.
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- W2056544336 doi "https://doi.org/10.1038/sj.bjp.0704591" @default.
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