DILATING EFFECT OF PROSTAGLANDIN ON THE CONSTRICTED DUCTUS ARTERIOSUS IN NEWBORN RATS

Abstract

The dilating effect of prostaglandin (PG) E₁ and E₂ on the once-constricted ductus arteriosus (DA) was examined in newborn rats. The animals were given subcutaneously PGs 3hr after caesarean delivery. The ratio of the DA to the pulmonary artery (PA) was determined 15, 30, 60, 90 and 180 min after injection. Both PGE₁ and PGE₂ dilated the DA for over 90 min. The maximal effect appeared 15 or 30 min after injection. The DA/PA ratio was significantly higher in PGE₂ than in PGE₁. In addition, another series of newborn rats were given subcutaneously PGE₂ 6 hr after caesarean delivery to examine the age-related changes in the DA-dilating effect. The DA/PA ratio was significantly decreased in 6-hr-old pups than in 3-hr-old pups. These findings indicate that both PGE₁ and PGE₂ have a dilating effect on the once-constricted DA and that the effect decreases with time.