Linked Life Data

3919050

Source:http://linkedlifedata.com/resource/pubmed/id/3919050

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1985-3-25
pubmed:abstractText
The present study was designed to elucidate gonadal steroid influences on gonadotropin release and subsequent pituitary desensitization to GnRH. Sixteen women, 10 of whom were normal and 6 of whom had hypogonadism, were infused with GnRH at rates ranging from 0.313-10 micrograms/h via an indwelling iv catheter for 66 h. Blood samples obtained throughout the GnRH infusion were analyzed for LH, FSH, estradiol, and progesterone. A prompt and substantial release of gonadotropin occurred in women with ovarian failure or during the luteal phase in normal women compared with that during the follicular phase of the menstrual cycle. Thereafter, a gradual decrease in gonadotropin secretion occurred due to pituitary desensitization, which was slower in the follicular phase than in other groups. A dose-related increase in integrated LH release occurred during GnRH infusion, but this response tapered off with administration of large doses of GnRH to women with ovarian failure or during the luteal phase. In contrast, it increased linearly up to the maximum dose of GnRH in the follicular phase. These data suggest that 1) basal levels of estrogen suppress the early rapid release of gonadotropin in response to GnRH and reduce subsequent pituitary desensitization, resulting in the prolonged release of LH; 2) estrogen widens the range of dose-related increases in gonadotropin in response to GnRH; and 3) these effects of estrogen are antagonized by progesterone.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0021-972X
pubmed:author
pubmed:issnType
Print
pubmed:volume
60
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
590-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1985
pubmed:articleTitle
Reduction in pituitary desensitization and prolongation of gonadotropin release by estrogen during continuous administration of gonadotropin-releasing hormone in women: its antagonism by progesterone.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't