Linked Life Data

3084223

Source:http://linkedlifedata.com/resource/pubmed/id/3084223

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1986-6-25
pubmed:abstractText
GnRH stimulates LH release from pituitary gonadotropes. Prolonged exposure of these cells to GnRH results in decreased sensitivity to further stimulation by the releasing hormone both in vivo and in vitro. Chelation of extracellular Ca++ with EGTA blocks GnRH-stimulated LH release but does not prevent subsequent desensitization. Desensitization occurs when cells are preincubated in EGTA containing 10(-7) M GnRH for a variety of times (20 min to 12 h) or when cells are preincubated for 3 h in EGTA with 10(-10), 10(-9), or 10(-8) M GnRH. A GnRH antagonist does not cause desensitization to GnRH and blocks desensitization in response to GnRH in the Ca++-free medium. Preincubation in EGTA containing 10(-7) M GnRH for 3 h did not alter sensitivity of cells to sn 1,2 dioctanoylglycerol (a protein kinase C activator), Ca++ ionophore A23187, or veratridine (an activator of endogenous ion channels). These results suggest that desensitization results from occupancy of the GnRH receptor by an agonist and may be uncoupled from LH release.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0013-7227
pubmed:author
pubmed:issnType
Print
pubmed:volume
118
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2599-604
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1986
pubmed:articleTitle
Gonadotropin-releasing hormone-mediated desensitization of cultured rat anterior pituitary cells can be uncoupled from luteinizing hormone release.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.