POTENTIATION OF TYRAMINE ACTION BY 5-HYDROXYTRYPTAMINE IN THE DOG HEART

Abstract
5-Hydroxytryptamine (5-HT) readily causes a release of norepinephrine [NE] by its tyramine-like action, as determined using the blood-perfused dog atrium and ventricular preparations. The interaction between 5-HT and tyramine was investigated using isolated atrial and ventricular preparations. Results suggest that 5-HT induces a release of NE from tyramine-sensitive storage sites.