Linked Life Data

3375444

Source:http://linkedlifedata.com/resource/pubmed/id/3375444

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1988-7-6
pubmed:abstractText
Clone A human colon cancer cells were exposed to concentrations of sodium butyrate (NAB, 0-2 mM) for three passages in vitro, and responses to either graded single doses or split doses of 250 kVp X rays were determined. The survival data were fit to the single-hit, multitarget model of inactivation. For the graded single dose experiments, we found that NAB produced a decrease in the magnitude of the quasi-threshold (Dq) parameter after a concentration of about 0.9 mM was exceeded. Similarly, in split dose experiments, the amount of sublethal damage recovery (SLDR) was reduced in a concentration-dependent manner as shown by a decrease in the Dq parameter. However, the inhibition of SLDR occurred with no apparent threshold NAB concentration. NAB did not affect potentially lethal damage recovery. Paradoxically, increasing concentrations of NAB produced an exponential increase in the intracellular glutathione content, which could be blocked by exposure of the cells to buthionine sulfoximine (BSO). BSO treatment of NAB-adapted cells led to additional cell killing, again most noted by changes in the Dq parameter. We postulate that these responses are associated with NAB-induced changes in chromatin structure, particularly the association between DNA and nucleosomal histones H3 and H4.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0033-7587
pubmed:author
pubmed:issnType
Print
pubmed:volume
114
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
579-88
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Changes in X-ray sensitivity and glutathione content of human colon tumor cells after exposure to the differentiation-inducing agent sodium butyrate.
pubmed:affiliation
Radiation Biology Laboratories, Brown University, Providence, Rhode Island 02902.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't