Linked Life Data

3947672

Source:http://linkedlifedata.com/resource/pubmed/id/3947672

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1986-4-15
pubmed:abstractText
The sera of developing chicken embryos contain high-affinity, low-capacity protein binding sites for testosterone. The affinities remain constant throughout development, with mean values for the association constants of approx. 3.6 X 10(8) M-1 at 25 degrees C, whereas the concentration of sites varies markedly as a function of age: from approx. 2 nmol/g serum proteins in 11-day embryos, it rises to a peak of approx. 5-8 nmol at 14-16 days, then drops to approx. 2.6 nmol at 18 days and only 0.8-1 nmol in adults. Testosterone binding is inhibited by corticosterone, progesterone and dihydrotestosterone, and is little affected by estradiol. The testosterone and corticosterone binding properties of chicken sera show close similarities: parallel ontogenic patterns; constant ratios, throughout development, of the equilibrium binding parameters of the two steroids; mutual binding inhibition. The evidence strongly suggests that the two activities are associated, at least in part, with a common protein carrier(s). In growing embryos which undergo a graft-versus-host reaction, elicited by the graft of adult spleen tissue at 9 days of age, the testosterone and corticosterone binding activities are significantly decreased. This decrease is due to a fall in the number of sites, whereas association constants are not affected. This is the first high-affinity, saturable, testosterone-binding property to be described in an embryonic serum.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
19
pubmed:volume
881
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
15-21
pubmed:dateRevised
2003-11-14
pubmed:meshHeading
pubmed:year
1986
pubmed:articleTitle
High-affinity binding of testosterone in serum from normal developing chick embryos and during the graft-versus-host reaction.
pubmed:publicationType
Journal Article