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Lack of presynaptic modulation by isoprenaline of 3H-noradrenaline release from rabbit isolated ear artery

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Summary

The aim of the present investigation was to examine whether or not presynaptic facilitatory β-adrenoceptors are detectable on the postganglionic nerves in the rabbit isolated ear artery. Strips of rabbit central ear artery were incubated with 3H-noradrenaline (10−7 mol/l; 30 min or 10−6 mol/l; 60 min). Subsequently, they were washed repeatedly with physiological salt solution. The strips were subjected to electrical-field stimulation (S1–S8) and the resultant 3H-overflow was determined.

When the ear artery was stimulated with 150 pulses (0.5 ms; 3 Hz; 225 mA), isoprenaline (10−9−10−6 mol/l) either alone or in the presence of either rauwolscine (10−6 mol/l) or phentolamine (10−6 mol/l) did not alter the stimulation-evoked 3H-overflow. This was also the case in the presence of rauwolscine (10−6 mol/l) plus either the selective phosphodiesterase inhibitor ICI 63 197 (3 × 10−5 mol/l) or forskolin (10−6 mol/l). When the ear artery was stimulated with 300 pulses (1 ms; 5 Hz; 225 mA), isoprenaline had no effect on the stimulation-evoked 3H-overflow. This was also the case when phentolamine (10−6 mol/l) was present. Propranolol (10−7−10−5 mol/l) did not alter the stimulation-evoked 3H-overflow. In some experiments, the stimulation current was reduced to 175 mA in order to obtain similar reference release (S3) values despite the presence of rauwolscine (150 pulses; 0.5 ms; 3 Hz). Even then, isoprenaline (10−9−10−6 mol/l) did not change stimulation-evoked 3H-overflow. The results suggest that postganglionic sympathetic nerves in rabbit central ear artery do not possess presynaptic facilitatory β-adrenoceptors.

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Abrahamsen, J., Nedergaard, O.A. Lack of presynaptic modulation by isoprenaline of 3H-noradrenaline release from rabbit isolated ear artery. Naunyn-Schmiedeberg's Arch Pharmacol 343, 161–165 (1991). https://doi.org/10.1007/BF00168604

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  • DOI: https://doi.org/10.1007/BF00168604

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