Linked Life Data

19075017

Source:http://linkedlifedata.com/resource/pubmed/id/19075017

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2009-2-2
pubmed:abstractText
Indoleamine 2,3-dioxygenase (IDO) catalyzes the initial and rate-limiting step in the degradation of tryptophan and is strongly induced in interferon-gamma (IFNgamma)-stimulated dendritic cells (DCs). IDO has recently been established as a key enzyme in T-cell suppression-mediated immune tolerance to tumors. STAT1 phosphorylation appears to play an important role in the control of IDO expression by IFNgamma, but the precise regulatory mechanism remains obscure. Here we present a novel mechanism of IFNgamma-induced IDO expression in bone marrow-derived dendritic cells. In addition, we demonstrate that curcumin, an active component of turmeric, significantly inhibited the induction of IDO expression and activity by IFNgamma. We found that curcumin suppressed STAT1 activation by directly inhibiting Janus-activated kinase 1/2 and protein kinase Cdelta phosphorylation in bone marrow-derived DCs, suppressing the subsequent translocation and binding of STAT1 to the GAS element of the IRF-1 promoter. Coincident with these inhibitory effects on IFNgamma-induced IDO expression, curcumin reversed IDO-mediated suppression of T-cell responses. Our results, thus, suggest that down-regulation of IDO in DCs is an important immunomodulatory property of curcumin that may be exploited therapeutically in the control of cancers.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
6
pubmed:volume
284
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3700-8
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:19075017-Active Transport, Cell Nucleus, pubmed-meshheading:19075017-Animals, pubmed-meshheading:19075017-Bone Marrow Cells, pubmed-meshheading:19075017-Cell Nucleus, pubmed-meshheading:19075017-Cucumis, pubmed-meshheading:19075017-Dendritic Cells, pubmed-meshheading:19075017-Gene Expression Regulation, Enzymologic, pubmed-meshheading:19075017-Immune Tolerance, pubmed-meshheading:19075017-Indoleamine-Pyrrole 2,3,-Dioxygenase, pubmed-meshheading:19075017-Interferon Regulatory Factor-1, pubmed-meshheading:19075017-Interferon-gamma, pubmed-meshheading:19075017-Janus Kinase 1, pubmed-meshheading:19075017-Janus Kinase 2, pubmed-meshheading:19075017-Mice, pubmed-meshheading:19075017-Neoplasms, pubmed-meshheading:19075017-Phosphorylation, pubmed-meshheading:19075017-Protein Kinase C-delta, pubmed-meshheading:19075017-Response Elements, pubmed-meshheading:19075017-STAT1 Transcription Factor, pubmed-meshheading:19075017-T-Lymphocytes
pubmed:year
2009
pubmed:articleTitle
Curcumin suppresses the induction of indoleamine 2,3-dioxygenase by blocking the Janus-activated kinase-protein kinase Cdelta-STAT1 signaling pathway in interferon-gamma-stimulated murine dendritic cells.
pubmed:affiliation
Department of Microbiology, College of Natural Science, Pusan National University, Geumjeong-Gu, Busan 609-735, Korea.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't