Linked Life Data

8938018

Source:http://linkedlifedata.com/resource/pubmed/id/8938018

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4-5
pubmed:dateCreated
1997-2-27
pubmed:abstractText
beta-adrenergic receptors (beta-ARs) were identified in CG-5 breast cancer cells using a radiometric assay. The total beta-AR concentration was measured using the highly potent beta-adrenergic antagonist (-)[3H]CGP 12177, and the densities of beta-AR subtypes were discriminated in the presence of highly selective unlabelled ligands (CGP 20712A and ICI 118551). Scatchard analysis revealed good linearity (r > 0.95) and Kd values (0.05-1 nM) indicated the presence of high affinity binding sites in CG-5 cell membranes. beta 2-AR concentrations (74%) were significantly (P < 0.05) higher than beta 1-AR concentrations (36%). Displacement studies indicated that tested adrenergic agonists displaced (-) [3H]CGP 12177 from its specific binding sites in the order of potency (-)isoproterenol > (+/-)clenbuterol > (-)adrenaline > (+/-)dobutamine > > (-)noradrenaline, whereas beta-adrenergic antagonists inhibited the binding in the following order of potency: (-)propranolol > > ICI 118 551 > > CGP 20712A. The functionality of beta-ARs identified in CG-5 cell membranes was demonstrated by the significant increase in cAMP production induced by different concentrations of isoproterenol vs unstimulated cells (control). The pathophysiological role of beta-ARs in breast cancer cells is still undefined, but their presence suggests the possible adrenergic regulation of some cellular activities such as proliferation and/or differentiation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1043-6618
pubmed:author
pubmed:issnType
Print
pubmed:volume
33
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
255-60
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:articleTitle
Evidence for functional beta-adrenoceptor subtypes in CG-5 breast cancer cell.
pubmed:affiliation
Department of Animal Pathology, University of Torino, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't