Proceedings: Neurohormonal control of prolactin release.
Acta Physiol Lat Am
; 23(6): 485-6, 1973.
Article
em En
| MEDLINE
| ID: mdl-4795042
PIP: Neurohomonal control of prolactin release was studied in pseudopregnant and pregnant rats. Nembutal administered at 1300 hours on Day 3 of pseudopregnancy prevented prolactin release which normally occurred at 1700 hours of the same day. Antiestrogen administered the day before did not prevent prolactin release but ovariectomy did. Estrogen administered immediately after ovariectomy did not restore prolactin secretion; however, progesterone on Day 3 in the ovariectomized-estrogen treated induced an increase in prolactin at 1700 hours. Progesterone was capable of increasing prolactin release the first 5 days of pseudopregnancy but not Days 6-12 when prolactin values were low. A similar effect was seen the first 7 days of pregnancy. Progesterone, but not estrogen, modified prolactin values on Day 9 at 1700 hours. Ovariectomy on Day 19 of pregnancy induced prolactin release within 4 hours and persisted for 58 hours. Progesterone administration immediately after ovariectomy prevented prolactin release for a few hours. These results suggest that the regulation of prolactin release by the central nervous system depends on the circulating estrogen/progesterone ratio, since estrogen facilitated prolactin release when plasma progesterone was low and progesterone induced prolactin release when adequated levels of estrogen existed, but exerted an inhibitory action when estrogen was not present.^ieng
Palavras-chave
Animals, Laboratory; Biology; Central Nervous System; Central Nervous System Effects; Clinical Research; Endocrine System; Estrogens; Family Planning; Fertility Agents; Hormones; Physiology; Pituitary Hormones; Progesterone; Prolactin; Prostaglandins; Pseudopregnancy; Reproductive Control Agents; Research Methodology; Tamoxifen
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ovário
/
Hipófise
/
Progesterona
/
Prolactina
/
Prostaglandinas
/
Estrogênios
Limite:
Animals
/
Pregnancy
Idioma:
En
Revista:
Acta Physiol Lat Am
Ano de publicação:
1973
Tipo de documento:
Article
País de publicação:
Argentina