Involvement of P1-purinoreceptors in the relaxing effect of adenosine in rat duodenum.Rosa Maria Gaion, Paola Dorigo, B Trolese, Edson Borin, Roger C Adami, L. GambarottoJournal of autonomic pharmacology19881. In isolated segments of rat duodenum, adenosine (50 microM-2 mM) caused a very rapid and short-lasting relaxation that was associated with a marked decrease in the amplitude of spontaneous… (More)