Release of substance P-like immunoreactivity into the antral lumen of cats.

SPLI can be detected in antral perfusates of cats. Experiments were performed in anesthetized cats provided with antral pouches. The pouches were perfused with 0.1 M HCl and 0.15 M NaCl. The concentration of SPLI in the perfusates was determined by radioimmunoassay. Basal output varied between 0--60 pg/min. Electrical vagal stimulation (2--10 Hz) caused release responses varying between 100--800 pg. Ach given i.v. or intraantrally also released SPLI into the antral lumen as well as adrenaline given i.v.