Linked Life Data

1847592

Source:http://linkedlifedata.com/resource/pubmed/id/1847592

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2 Pt 1
pubmed:dateCreated
1991-3-27
pubmed:abstractText
The binding of epidermal growth factor (EGF) to its receptor and the activity of the receptor intrinsic protein-tyrosine kinase were studied during the ontogeny of rat liver. The number of EGF receptors during pre- and postnatal development was first compared in crude liver plasma membranes using 1) specific binding of 125I-labeled EGF and 2) immunoblot analysis using any antireceptor polyclonal rabbit antibody. Both methods detected the expression of the EGF receptor in fetal rat liver on day 17 of gestation, but in an amount markedly less than the adult. Within 24 h, there was a more than twofold increase in EGF binding to plasma membranes as well as a marked increase in receptor immunoreactivity. However, after birth, there was a precipitous drop in receptor number to less than 20% of the adult level by the end of the first postnatal day (P less than 0.001). Next, the presence of EGF-stimulated tyrosine kinase activity (autophosphorylation) was determined during the same stages of development. Electrophoresis of membranes phosphorylated in the presence or absence of EGF followed by autoradiography demonstrated autokinase activity stimulated by EGF in day 18 and 19 fetal liver plasma membranes, but not in membranes on day 17 of gestation. Similar to the pattern observed with EGF binding, there was a decrease in autokinase activity in early neonatal plasma membranes followed by an increase to near adult levels by 7 days postnatally. Quantitation of the amount of 32P radioactivity associated with the EGF receptor bands in each age group, correlated with the degree of autophosphorylation assessed by autoradiography.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
260
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
G290-8
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Ontogeny of epidermal growth factor receptor tyrosine kinase in rat liver.
pubmed:affiliation
Division of Basic Science Research, Children's Hospital Research Foundation, Cincinnati, Ohio 45229.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.