Linked Life Data

15161372

Source:http://linkedlifedata.com/resource/pubmed/id/15161372

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2004-5-26
pubmed:abstractText
To investigate the repair of clustered lesions within the DNA/chromatin, the focus formation and persistence of foci of the phosphorylated histone protein H2AX and the repair protein MRE11 were studied in normal cells and in cells lacking DNA-PKcs (M059J) or ATM (GM2052D) after irradiation with high-LET nitrogen ions or low-LET photons. There was a rapid formation of MRE11 and gamma-H2AX foci, and 0.5 h after high-LET irradiation, the number of foci in normal cells correlated well with the number of particle hits per cell nucleus. After 8 h of repair, there were significantly more gamma-H2AX foci than MRE11 foci remaining in the normal cells, independent of radiation quality. The difficulty in repairing clustered breaks was detected as slower rejoining of DSBs (measured by DNA fragmentation analysis), as quantification of the amount of gamma-H2AX over time, and as a larger fraction of repair foci remaining after 24 h in cells irradiated with high- LET ions. These data indicate that clustered lesions are repaired by a pathway involving the same proteins that repair sparsely distributed breaks. Further, for both low- and high- LET radiation, no reduction of the initial number of gamma-H2AX and MRE11 foci was detected in M059J cells up to 21 h after irradiation, which was in accordance with a complete absence of DSB rejoining in these cells. In the GM2052D cells there was also a higher level of foci remaining after 21 h; however, this was not accompanied by unrejoined DSBs, indicating that these foci not only represent DSBs but also may be a sign of persistent problems even when breaks are rejoined.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/CIB1 protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Calcium-Binding Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Cell Cycle Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Cesium Radioisotopes, http://linkedlifedata.com/resource/pubmed/chemical/DNA, http://linkedlifedata.com/resource/pubmed/chemical/DNA-Binding Proteins, http://linkedlifedata.com/resource/pubmed/chemical/H2AFX protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Histones, http://linkedlifedata.com/resource/pubmed/chemical/Ions, http://linkedlifedata.com/resource/pubmed/chemical/MRE11A protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Protein-Serine-Threonine Kinases, http://linkedlifedata.com/resource/pubmed/chemical/Tumor Suppressor Proteins, http://linkedlifedata.com/resource/pubmed/chemical/ataxia telangiectasia mutated...
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0033-7587
pubmed:author
pubmed:issnType
Print
pubmed:volume
161
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
517-27
pubmed:dateRevised
2011-11-2
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Focus formation of DNA repair proteins in normal and repair-deficient cells irradiated with high-LET ions.
pubmed:affiliation
Division of Biomedical Radiation Sciences, Rudbeck Laboratory, Uppsala University, SE-75185 Uppsala, Sweden. karin.karlsson@bms.uu.se
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't