Linked Life Data

9581846

Source:http://linkedlifedata.com/resource/pubmed/id/9581846

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
1998-6-2
pubmed:abstractText
All-trans-retinoic acid (RA) is used as a differentiation therapy for acute promyelocytic leukemia. Patients can become resistant to RA, and this resistance is thought to be mediated in part by an increase in the rate of RA metabolism. We have characterized the metabolism of all-trans-retinol (ROL; vitamin A) in NB4 cells, which are human promyelocytic leukemia cells. NB4 cells metabolize ROL into a variety of compounds, including all-trans-4-hydroxyretinol, all-trans-4-oxoretinol (4-oxoROL), 14-hydroxy-4,14-retro-retinol, anhydroretinol, and several ROL esters. No metabolism of ROL to RA or to RA derivatives in NB4 cells was detected. The rate of ROL metabolism increased after cell differentiation; in a 24-h period, differentiated cells metabolized 2-fold more ROL than did undifferentiated cells. The major difference in the ROL metabolism pattern between undifferentiated and differentiated cells was an approximately 10-fold increase in the production of all-trans-4-hydroxyretinol and 4-oxoROL in differentiated cells. Furthermore, exogenously added 4-oxoROL was capable of eliciting NB4 cell differentiation, as measured by growth inhibition, nitroblue tetrazolium reduction, nuclear body relocalization of PML, and surface expression of CD11b. In addition, 4-oxoROL synergized with IFN-gamma in the promotion of NB4 cell growth arrest. Following treatment of NB4 cells with 4-oxoROL to induce differentiation, the production of 4-oxoROL from ROL was observed; this indicated that 4-oxoROL induces its own synthesis in NB4 cells. In addition, 48 h after the administration of 1 microM 4-oxoROL, NB4 cells maintained a high intracellular concentration (17 microM) of 4-oxoROL. These unique properties of 4-oxoROL may provide advantages over RA in the treatment of promyelocytic leukemia cells because it may be possible to maintain cytodifferentiating concentrations of 4-oxoROL in the cells for extended periods of time.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0008-5472
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
58
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2007-13
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
4-Oxoretinol, a metabolite of retinol in the human promyelocytic leukemia cell line NB4, induces cell growth arrest and granulocytic differentiation.
pubmed:affiliation
Department of Pharmacology, Cornell University Medical College, New York, New York 10021, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't