Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
2007-10-25
pubmed:abstractText
FKHRL1 (also called FOXO3a) is a member of the Forkhead Box, class O (FOXO) subfamily of forkhead transcription factors and functions downstream of Bcr-Abl tyrosine kinase as a phosphorylated inactive form in chronic myelogenous leukemia (CML). The Bcr-Abl tyrosine kinase inhibitor imatinib induces cell cycle arrest and subsequent apoptosis via the conversion of FKHRL1 from the phosphorylated inactive form to the dephosphorylated active form in CML-derived cell lines. In the present study, we examined whether active FKHRL1 can overcome resistance to imatinib. To this end, we generated a 4-hydroxytamoxifen-inducible active FKHRL1 (FKHRL1-TM; a triple mutant of FKHRL1 in which all three Akt phosphorylation sites have been mutated)-estrogen receptor fusion protein expression system in CML-derived imatinib-resistant cell lines. 4-Hydroxytamoxifen inhibited cell growth and cell cycle progression, and subsequently induced apoptosis, accompanied by upregulation of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL). Thus, active FKHRL1 antagonized deregulated proliferation and induced apoptosis in these cell lines. In addition, imatinib-resistant cells underwent apoptosis after transfection with full-length TRAIL cDNA. Collectively, our results suggest that active FKHRL1 can overcome imatinib resistance in CML cells, in part via TRAIL production.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
1349-7006
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
98
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1949-58
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Active FKHRL1 overcomes imatinib resistance in chronic myelogenous leukemia-derived cell lines via the production of tumor necrosis factor-related apoptosis-inducing ligand.
pubmed:affiliation
Division of Hematology, Department of Medicine, Jichi Medical University, Tochigi-ken 329-0498, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't