PMID: 2994790Aug 1, 1985

Identification of presynaptic beta 2-adrenoceptors on the sympathetic nerve fibres of the human pulmonary artery

British Journal of Pharmacology
M Göthert, F Hentrich


Strips of human pulmonary arteries from patients undergoing surgery for lung tumour were incubated with [3H]-noradrenaline. Subsequently, they were superfused with physiological salt solution containing cocaine and corticosterone. Tritium overflow from the strips was stimulated by transmural electrical impulses (2 Hz). The electrically evoked overflow of tritium consisted of 91% unmetabolized [3H]-noradrenaline, and this percentage was not altered by isoprenaline. Adrenaline (in the presence of rauwolscine), isoprenaline and the preferential beta 2-adrenoceptor agonist, procaterol, concentration-dependently increased the electrically evoked tritium overflow. Prenalterol, a beta-adrenoceptor agonist with moderate preference for beta 1-adrenoceptors, was considerably less active than the previously mentioned agonists; noradrenaline (in the presence of rauwolscine) was ineffective. The concentration-response curve of procaterol was shifted to the right by the preferential beta 2-adrenoceptor antagonist ICI 118-551 but was not affected by the beta 1-selective antagonist, atenolol. Propranolol, but not atenolol, produced a shift to the right of the concentration-response curve of isoprenaline. It is concluded that the sympathetic ne...Continue Reading


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