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- W2000374180 abstract "Abstract The effects of ageing on α1-adrenoceptor subtypes have been examined in heart ventricular muscle of young (2–3 months) and middle-aged (18 months) Sprague-Dawley rats. Radioligand binding studies with [3H]prazosin revealed an age-related loss of binding sites (Bmax 56·7 ± 1·93 fmol (mg protein)−1 age 2 months vs 31·7 ± 2·45 fmol (mg protein)−l age 18 months) not followed by changes in the dissociation constant value (Kd 0·16 ± 0·03 nm age 2 months and 0·10 ± 0·03 nm age 18 months). Competition curves with WB 4101 showed two distinct sites with different affinities, the proportion of sites with high affinity being similar for both age groups (22·2 ± 1·89% vs 17·8 ± 1·96% for animals aged 2 and 18 months, respectively). Agonist displacement curves of [3H]prazosin indicate the existence of two different affinity sites for the agonist, that are maintained regardless of the ageing process (Rhigh= 16·2 ± 1·54% and Rlow = 83·8 ± 1·89% in rats aged 2 months and Rhigh= 16·3 ± 3·23% and Rlow = 83·7 ± 3·95% in rats aged 18 months). The fractional inactivation of α1-adrenoceptors by chloroethylclonidine resulted in a loss of [3H]prazosin specific binding, and a percentage of 22·5 ± 0·95 and 22·6 ± 4·2 of remaining binding sites for the groups of 2 and 18 months of age, respectively. The percentage of chloroethylclonidine-insensitive [3H]prazosin binding sites was similar to those with high affinity for WB 4101. The present study confirms a decline of α1-adrenoceptors with increasing age and reveals that the equilibrium of the expression of the two existing subpopulations of the receptor is maintained during ageing." @default.
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- W2000374180 title "Effects of age on α1-adrenoceptor subtypes in the heart ventricular muscle of the rat" @default.
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- W2000374180 doi "https://doi.org/10.1111/j.2042-7158.1993.tb05618.x" @default.
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