Linked Life Data

9386991

Source:http://linkedlifedata.com/resource/pubmed/id/9386991

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1997-12-17
pubmed:abstractText
Human colon cancer cell lines COLO205, HT29 and SW620 are known to secrete insulin-like growth factor II (IGF-II) and its modulatory binding proteins (IGFBPs). We have characterised the sensitivity of these cell lines to exogenous IGF-I and have examined the effects of their autocrine IGFBPs on these responses. Cells cultured in serum-free medium were treated with 1-100 ng/ml IGF-I, or des(1,3)IGF-I, a truncated IGF-I with low affinity for IGFBPs. DNA synthesis was determined by 24 h incorporation of 3H-thymidine. Experiments were repeated in the presence of 24 h cell-conditioned media containing endogenous IGFBPs. In all 3 cell lines, cell-conditioned media reduced sensitivity to IGF-I but not to des(1,3)IGF-I suggesting that IGFBPs in the cell-conditioned media of colon cells inhibit IGF-I action. IGFBPs in the cell layer and 24 h cell-conditioned media were identified by Western ligand and antibody analyses. IGFBP-4 was secreted by all cell lines and IGFBP-2 from the COLO205 and SW620 cells lines but not the HT29 cells. No IGFBP-3 was secreted by any of the cell lines but IGFBP-3 was found in the cell layer in all of the cell lines. When endogenous secreted IGFBPs were removed, cell lines were consistently more sensitive to IGF-I than des(1,3)IGF-I suggesting that IGFBP-3 associated with the cell layer enhances responses to IGF-I. This is in contrast to the effects of the secreted IGFBPs. Differential modulating actions of IGFBPs may be important in regulating colon cell turnover.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0897-7194
pubmed:author
pubmed:issnType
Print
pubmed:volume
14
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
269-77
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Insulin-like growth factor binding proteins as mediators of IGF-I effects on colon cancer cell proliferation.
pubmed:affiliation
Department of Medicine, University of Birmingham, Queen Elizabeth Hospital, Edgbaston, UK.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't