Linked Life Data

3557087

Source:http://linkedlifedata.com/resource/pubmed/id/3557087

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1987-5-6
pubmed:abstractText
At various stages throughout the annual reproductive cycle, female rainbow trout (Salmo gairdneri) were fitted with a catheter in the dorsal aorta. They were bled via the catheter at frequencies of once every 30, 60, or 240 min over periods of 5 to 24 hr. Gonadotropin (GtH), estradiol-17 beta (E(2)17 beta). and estrone levels were measured in the plasma samples. At early ovarian recrudescence (March), short-term (1-2 hr), high-amplitude (delta GtH = up to 100 ng/ml), episodic pulses of GtH were recorded in the plasma of 12 of the 26 studied fish. In the others, GtH levels remained low and constant. No synchronization was found among the individual GtH profiles. E(2)17 beta levels in the same fish were low and constant while estrone was not detectable. At early stages of exogenous vitellogenesis (June), plasma GtH (1-3 ng/ml) and E(2)17 beta (0.5-1.5 ng/ml) levels were low and constant. At advanced stages of exogenous vitellogenesis (September-October), fluctuating GtH levels were found again in most of the females; basal GtH concentrations were only slightly higher than those recorded in June. The fluctuations consisted of short-term (1-3 hr) random GtH pulses of moderate amplitude (delta GtH = up to 5 ng/ml), occurring at a relatively high frequency (up to 5 per 12 hr). Although no regular synchronous daily pattern of GtH was noted, most of the GtH pulses were observed during the photophase and early scotophase. The appearance of GtH pulsatility during exogenous vitellogenesis was accompanied by a large increase in plasma E(2)17 beta up to levels ranging from 6 to 30 ng/ml. In contrast to the GtH profiles, the E(2)17 beta profiles showed continuous and progressive variations, superimposed the abrupt GtH pulses, and a high degree of synchronization. E(2)17 beta levels increased during the photophase and reached maxima toward and during early scotophase.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0016-6480
pubmed:author
pubmed:issnType
Print
pubmed:volume
64
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
172-88
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1986
pubmed:articleTitle
Short-term profiles of plasma gonadotropin and estradiol-17 beta levels in the female rainbow trout, from early ovarian recrudescence and throughout vitellogenesis.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't