Linked Life Data

4035004

Source:http://linkedlifedata.com/resource/pubmed/id/4035004

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1985-10-21
pubmed:abstractText
Patterns of cell loss and repopulation were studied in plateau phase cultures of slowly-cycling, contact-inhibited C3H 10T1/2 mouse fibroblasts following large single, and multiple small doses of 137Cs-gamma rays. A progressive, dose-independent cell loss was apparent within days after irradiation with large single doses, and similar patterns of loss were observed following the start of multifraction irradiations. This progressive cell loss culminated in the loss of integrity of the monolayer of cells, a loss of contact-inhibition, and therefore, an increased rate of cell division. The time of onset of measurable repopulation, and the time required to completely repopulate a culture varied with the number of clonogenic cells present at the time of breakdown of the monolayer. For cultures receiving multiple irradiations over time periods greater than those required for breakdown of the monolayer, repopulation began to occur during treatment, and its rate varied with the average dose per fraction being delivered. Thus, repopulation did not start immediately after the start of irradiation, but needed a triggering event, in this case, a decrease to a critical level in the cell density. Once initiated, repopulation was able to decrease or even eliminate the effectiveness of subsequent doses in reducing the number of viable cells per culture. To the extent that the responses of slowly-cycling, contact-inhibited cells in vitro can be applied to interpret the radiation responses of cell populations in vivo, these results further support the notion that it may be necessary, in some cases, to account for an increasing contribution from repopulation with increasing overall treatment time in dose fractionation isoeffect formulae used for predicting tissue tolerances or tumor control.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0167-8140
pubmed:author
pubmed:issnType
Print
pubmed:volume
4
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
71-85
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1985
pubmed:articleTitle
Patterns of cell loss and repopulation in irradiated cultures of plateau phase C3H 10T 1/2 cells.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.