Einfluß von Prostaglandin F2α auf die Motilität des Eileiters von Legehennen in vitro

Effects of arginine vasotocin and prostaglandin E1 on the hen uterus

In the domestic hen, the uterine portion of the oviduct responded in vitro to arginine vasotocin (AVT) and prostaglandin E1 (PGE1) at all investigated stages of the egg-laying cycle. However, the uterus was less responsive to both hormones during oviposition. The injections of these hormones provoked premature oviposition and a significant pressure increase in the uterus. In vitro and in vivo AVT was a more potent uterine stimulant than PGE1. Indomethacin, an inhibitor of prostaglandin biosynthesis, antagonized in vitro the contractor activity of AVT but not that of PGE1. Prostaglandin-like activity was demonstrated in the hen uterine tissue at the time of oviposition. It is concluded that AVT may cause uterine contractions via a prostaglandin activated mechanism.

A possible role of prostaglandins in the regulation of ovum transport and oviposition in the domestic hen?

Prostaglandin (PG) F2 alpha provoked a contraction of longitudinal tissue strips from the uterine, vaginal and isthmus regions of the chicken oviduct; no response was induced in longitudinal tissue strips from the magnum and infundibulum. PGF2 induced a contraction of circular and longitudinal uterine strips and of circular stips from the isthmus and infundibulum. With both circular and longitudinal vaginal strips a relaxation was obtained. A dose-dependent response was observed with circular magnum strips: contraction with low doses and relaxation at higher doses. No response was obtained with longitudinal tissue strips from the isthmus, magnum and infundibulum. The possible influence of both prostaglandins in the mechanism of ovum transport and oviposition in the domestic hen is discussed.