In previous studies on regulation of fetal adrenocorticotropin (ACTH) secretion, corticotropin releasing factor (CRF) and ariginine vasopressin (AVP) have been administered by peripheral intravascular infusion. In order to look at an alternate route of administration, we investigated the effect of continuous intracerebroventricular administration of AVP to the fetus on fetal plasma ACTH and fetal and maternal plasma cortisol concentrations. Sheep fetuses (n=9) were instrumented with carotid artery and lateral cerebral ventricular catheters. Fetuses were given intracerebroventricular infusion from 125-134 days gestational age of artificial cerebrospinal fluid vehicle (n=4), or AVP 250 μU·min-1 continuously in artificial cerebrospinal fluid vehicle (n=5). Fetal blood was obtained daily between 09.00 and 12.00 h and 20.00 and 23.00 h. Over the infusion period, fetal plasma ACTH and cortisol concentrations in AVP infused fetuses increased (P<0.05) compared with the vehicle infused group. Gestation length for the fetuses in the AVP and vehicle infused groups were 139 ± 4.9 (n=4) and 145 ± 4.6 (n=3) days respectively (n.s.). Fetal plasma AVP concentrations in the AVP infused group were not different from the vehicle infused group.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Developmental Physiology|
|State||Published - 1989|
ASJC Scopus subject areas
- Developmental Biology