Linked Life Data

14656943

Source:http://linkedlifedata.com/resource/pubmed/id/14656943

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2004-3-23
pubmed:abstractText
The dysfunction of homologous and/or heterologous gap junctional intercellular communication (GJIC) has been implicated in tumorigenesis of many kinds of cells. Here we have characterized GJIC and the expression of connexins in six human lung carcinoma cell lines and normal lung fibroblasts (HLF). Compared with HLF, all the carcinoma cells showed reduced or little homologous GJIC. They expressed remarkably reduced connexin(Cx)43 mRNA and variable levels of Cx45 mRNA, but neither Cx43 nor Cx45 protein could be detected. However, using a preloading assay, transfer of calcein was observed between donor HLF cells and first order neighboring recipient tumor cells (recipient cells in 1000-fold excess). Transfer from tumor to HLF cells under the same conditions was not seen, although increasing the ratio of donor tumor cells to recipient HLF cells and plating the cells at low density did reveal weak transfer from tumor cells to HLF. Transfection of Cx43 into giant cell carcinoma PG cells increased homologous communication and eliminated the rectifying behavior of heterologous communication. This indicates that the apparent rectification of dye transfer between normal and tumor cells was a product of low rates of heterologous transfer linked to (i) rapid dilution of the dye to below detectable limits through a very well coupled cell population (tumor to HLF) and (ii) concentration of dye in immediate neighbors in a poorly coupled cell population (HLF to tumor cells). These results suggest that the coupling levels may need to exceed a certain threshold to allow propagation of signals over a sufficient distance to affect behavior of a cell population. We propose that the relative rates of heterologous and homologous coupling of cell populations and the 'pool size' of shared metabolites in tumor cells and the surrounding normal tissue are likely to be very important in the regulation of their growth.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0143-3334
pubmed:author
pubmed:issnType
Print
pubmed:volume
25
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
473-82
pubmed:dateRevised
2010-5-26
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Effective asymmetry in gap junctional intercellular communication between populations of human normal lung fibroblasts and lung carcinoma cells.
pubmed:affiliation
Department of Cell Biology, Beijing Institute for Cancer Research, Beijing University School of Oncology, Da-Hong-Luo-Chang Street, Western District, Beijing 100034, People's Republic of China. zqzhang@public3.bta.net.cn
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't