Linked Life Data

14755242

Source:http://linkedlifedata.com/resource/pubmed/id/14755242

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
15
pubmed:dateCreated
2004-4-8
pubmed:abstractText
Tat is an early regulatory protein of human immunodeficiency virus type 1, which plays a central role in the pathogenesis of AIDS by stimulating transcription of the viral genome and impairing several important cellular pathways during the progression of the disease. Here, we investigated the effect of Tat on cell response to DNA damage. Our results indicate that Tat production causes a noticeable increase in the survival rate of PC12 cells upon their treatment with genotoxic agents. Single-cell gel electrophoresis studies revealed reduced DNA breakage in PC12-Tat cells upon cisplatin treatment relative to the control cells. Furthermore, cytogenetic data exhibited less chromosomal damage in Tat-producing cells after recovery from cisplatin treatment, corroborating electrophoretic data. Examination of several proteins involved in the control of DNA repair showed elevated levels of Rad51, a key regulator of homologous recombination in cells expressing Tat. On the other hand, the level of Ku70, one of the components of the nonhomologous end-joining repair pathway, was slightly decreased in cells expressing Tat. Using a fluorescence-based assay, we demonstrated that repair of DNA double-strand breaks via homologous recombination is increased in Tat-producing cells. The results from in vitro nonhomologous end-joining assay revealed a reduced ability of protein extract from PC12-Tat cells compared to PC12 cells in rejoining linearized DNA. These observations ascribe a new role for Tat in host genomic integrity, perhaps by affecting the expression of genes involved in DNA repair.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0950-9232
pubmed:author
pubmed:issnType
Print
pubmed:day
8
pubmed:volume
23
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2664-71
pubmed:dateRevised
2010-8-13
pubmed:meshHeading
pubmed-meshheading:14755242-Animals, pubmed-meshheading:14755242-Antigens, Nuclear, pubmed-meshheading:14755242-Antineoplastic Agents, pubmed-meshheading:14755242-Blotting, Western, pubmed-meshheading:14755242-Cell Survival, pubmed-meshheading:14755242-Chromosome Aberrations, pubmed-meshheading:14755242-Cisplatin, pubmed-meshheading:14755242-Comet Assay, pubmed-meshheading:14755242-DNA, Complementary, pubmed-meshheading:14755242-DNA Damage, pubmed-meshheading:14755242-DNA Repair, pubmed-meshheading:14755242-DNA-Binding Proteins, pubmed-meshheading:14755242-Gene Products, tat, pubmed-meshheading:14755242-Genes, Reporter, pubmed-meshheading:14755242-Luciferases, pubmed-meshheading:14755242-PC12 Cells, pubmed-meshheading:14755242-Plasmids, pubmed-meshheading:14755242-Rad51 Recombinase, pubmed-meshheading:14755242-Rats, pubmed-meshheading:14755242-Time Factors, pubmed-meshheading:14755242-Transcriptional Activation
pubmed:year
2004
pubmed:articleTitle
HIV-1 Tat increases cell survival in response to cisplatin by stimulating Rad51 gene expression.
pubmed:affiliation
Center for Neurovirology and Cancer Biology, College of Science and Technology, Temple University, 1900 North 12th Street, 015-96, Philadelphia, PA 19122, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't