The effects of the oligopeptides pentagastrin, cholecystokinin octapeptide, substance P, and FMRF-amide on the feeding and avoidance behaviour of the land snail Helix lucorum were studied. Administration of 1 microM pentagastrin to fasted snails immediately before feeding led to a significant increase in the amount of food consumed in the first 20 min of the feeding period, although there was no change in the total amount of food consumed. Prefeeding injections of 0.05 microM pentagastrin or 0.05 microM or 1 microM solutions of cholecystokinin octapeptide, substance P, or FMRF-amide had no effect on feeding behaviour. Pentagastrin and cholecystokinin octapeptide (0.05 microM solutions) invoked a significant reversible decrease in the generalised avoidance reaction thresholds in fasted but not in prefed snails, whereas the same concentration of FMRF-amide reduced these thresholds only in prefed snails.
|Original language||English (US)|
|Number of pages||4|
|State||Published - Jan 1990|