Linked Life Data

15754032

Source:http://linkedlifedata.com/resource/pubmed/id/15754032

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2005-3-8
pubmed:abstractText
Normal human liver cells have a limited capacity for proliferation due to telomere shortening, whereas immortalized cells prevent shortening of the 3' single strand telomeric repeat by expressing telomerases, including human telomerase reverse transcriptase (hTERT). The hTERT transcript contains three deletion sites that give rise to alternatively spliced variants (ASVs). Recently, hTERT expression was observed in cycling primary presenescent human fibroblasts, which were believed to lack hTERT expression and telomerase activity. hTERT mRNA was expressed in the synthesis (S) phase of the cell cycle. Although hTERT mRNA has eight isoforms, it is not known which of the hTERT ASVs are expressed in S phase. In order to determine the possible relationships between the cell cycle and ASV expressions, we measured the full-length isoform and ASVs of hTERT mRNA in a mortal liver cell line and immortal cell lines that were synchronized in S phase of the cell cycle. Using RT nested-PCR analysis, the full-length isoform and alpha-deletion ASV of hTERT were detected in the LI90 mortal liver cell line at points when cells in S phase represented >48% of the cell population without detectable telomerase activity. hTERT was always expressed in the HLE and Huh-7 hepatocellular carcinoma cell lines, regardless of the cell cycle. Our results suggest the possibility that telomerase is regulated in a cell cycle-dependent manner in normal liver cells.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1107-3756
pubmed:author
pubmed:issnType
Print
pubmed:volume
15
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
683-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Expression of hTERT mRNA in a mortal liver cell line during S phase without detectable telomerase activity.
pubmed:affiliation
Center for Molecular Biology and Cytogenetics, SRL, Inc., Hachioiji, Tokyo 192-0031, Japan.
pubmed:publicationType
Journal Article