Linked Life Data

1728293

Source:http://linkedlifedata.com/resource/pubmed/id/1728293

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1992-2-5
pubmed:abstractText
Epidermal growth factor (EGF) is known to induce fetal lung maturation and its receptor is present in the lungs of several species. Recently, EGF has been immunolocalized in type II pneumocytes in rat lung. We postulated that EGF is synthesized in type II pneumocytes and that, because of its position-restricted distribution within the alveolus, EGF might act as an autocrine regulator of type II pneumocyte function. Herein, we have tested the hypothesis using adult rat type II pneumocytes in primary culture. In situ hybridization, using an oligonucleotide probe corresponding to amino acid residues 1070 to 1081 of mouse EGF precursor, demonstrated the presence of EGF precursor mRNA. Upon S-200 Sephacryl gel chromatography of type II pneumocyte extracts, EGF-reactive protein eluted as a high-molecular-weight form (greater than 100 kD). EGF immunoreactivity was localized within type II pneumocytes in the periphery of groups of 10 to 15 cells in culture. The type II pneumocytes bound [125I]EGF in a specific manner, indicating the presence of EGF receptors. Scatchard plots gave an apparent affinity constant (Ka) of 1 x 10(9) liters/mol, and the number of receptors was estimated to be 4.8 x 10(11) mg protein (50 per cell). EGF receptor binding specificity was confirmed by the absence of an autoradiographic signal for cells incubated in the presence of a 100-fold excess concentration of transforming growth factor-alpha. Binding of [125I]EGF could also be downregulated 95% by incubation with 0.2 nM transforming growth factor-alpha.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
1044-1549
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:geneSymbol
EGF
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
44-9
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Epidermal growth factor transcription, translation, and signal transduction by rat type II pneumocytes in culture.
pubmed:affiliation
Division of Neonatology and Pediatric Pulmonology, Childrens Hospital of Los Angeles, CA 90027.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't