[Effects of ACTH or hCG on corticosterone and progesterone secretion from adrenal glands of the rats at various ages].

Effects of ACTH or hCG on the secretion of corticosterone (CB) and progesterone (PRG) from adrenal glands of the female rats at various ages were studied. In in vitro experiment, adrenal gland cells were isolated from fetal, neonatal, immature and adult rats by the method described by us before and were incubated in MEM. We chose to designate the hormones in the medium as hormone secretion. In in vivo experiment, hormones in the serum were determined. In vitro experiment, in which ACTH was added to the medium, indicated that CB was low in the media containing the cells from fetal and neonatal glands compared to those from immature and adult. PRG was elevated by ACTH addition at all of the ages. hCG addition had no effects on both CB and PRG in the media of immature and adult rats. In vivo experiment, in which ACTH was injected s.c., indicated that the response of serum PRG was slightly earlier than the CB response and peaked with a subsequent decline in immature rats. The results suggest that adrenal gland responds to ACTH from fetal age and secrets PRG, but little of CB in fetal age.