ISSN:
1432-1912
Keywords:
3H-betaxolol release
;
Rat atrium
;
Stellate ganglionectomy
;
Reserpine pretreatment
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary Under in vitro conditions, 3H-betaxolol was accumulated in rat atrial slices, reaching a tissue-medium ratio of 12.3±1.8 ml/g. This process was temperature-dependent, but ouabain-resistant. 3H-Betaxolol accumulated in atrial slices was subsequently released by electrical stimulation. The electrically-evoked release of 3H-betaxolol was abolished in the absence of calcium, and reduced in the presence of bretylium 10 μM. After surgical sympathetic denervation by stellate ganglionectomy there was a marked reduction in the endogenous content of noradrenaline and in the retention of 3H-noradrenaline in atrial slices. The concomitant decrease in the amount of 3H-noradrenaline released by electrical stimulation following denervation was modest, although statistically significant. Following sympathetic denervation, the tissue retention of 3H-betaxolol was not significantly affected, but the release of 3H-betaxolol by electrical stimulation was considerably reduced. After pretreatment with reserpine the amount of radioactivity released by electrical stimulation from slices labelled with 3H-betaxolol or 3H-noradrenaline was markedly reduced. The tissue retention of 3H-noradrenaline was reduced to a larger extent than that of 3H-betaxolol following the administration of reserpine. The simultaneous release of noradrenaline and betaxolol by nerve stimulation observed under our experimental conditions may represent a mechanism through which betaxolol can reach selectively the postsynaptic β 1-adrenoceptors and reinforce β-adrenoceptor blockade in the heart.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00504863
