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- W1487006512 abstract "β(2) -Adrenoceptor agonists are important bronchodilators used for the treatment of chronic obstructive pulmonary disease and asthma. Clinical data on β(2) -adrenoceptor agonists show a range of onset and duration of action. We have investigated whether the receptor binding kinetics of β(2) -adrenoceptor agonists can explain their observed onset of action and duration of effect in the clinic.[(3) H]-DHA was used to label β(2) -adrenoceptors expressed in CHO-cell membranes (K(d) of 0.084 nM). Competition kinetic experiments were performed in the presence of unlabelled β(2) agonists at 37°C in HBSS containing GTP. To determine the kinetic parameters, three concentrations (10, 3 and 1 ×K(i) ) of the unlabelled compound were employed against a fixed concentration of [(3) H]-DHA (0.6 nM).The clinically used β(2) -adrenoceptor agonists exhibited a range of association and dissociation rates. The kinetic K(d) and the competition K(i) values of the eight β(2) -adrenoceptor agonists examined were strongly correlated, suggesting that the method had produced accurate k(off) and k(on) rates. The kinetic on-rate was highly correlated with equilibrium binding affinity.Although the β(2) -adrenoceptor agonists displayed a range of kinetic rate parameters, simulations at relevant drug concentrations suggest that receptor kinetics do not play an important role in determining onset of action in the clinic. In addition, it is unlikely that receptor kinetics exert an important influence on the duration of action of these agonists, as indacaterol (once daily dosing) had a shorter residency time at the receptor than salmeterol (twice daily dosing)." @default.
- W1487006512 created "2016-06-24" @default.
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- W1487006512 date "2012-03-23" @default.
- W1487006512 modified "2023-10-11" @default.
- W1487006512 title "Slow receptor dissociation is not a key factor in the duration of action of inhaled long-acting β2-adrenoceptor agonists" @default.
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- W1487006512 doi "https://doi.org/10.1111/j.1476-5381.2011.01639.x" @default.
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