Linked Life Data

18555589

Source:http://linkedlifedata.com/resource/pubmed/id/18555589

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pubmed-article:18555589pubmed:abstractTextCD123 has been identified as a specific surface marker for plasmacytoid dendritic cells (PDCs). However, CD123 has recently been shown to be expressed on freshly isolated or in vitro generated myeloid dendritic cells (MDCs). In this article, we investigated whether the expression of CD123 on monocyte-derived MDCs was related to their function, especially to tumor-inhibiting potential. MDCs were induced from cord blood CD14+ monocytes with granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin-4 (IL-4) for 7 days, and then CD123+ cells were isolated by positive immunomagnetic cell selection. We observed that CD123+ cells lost monocyte CD14 expression, acquired immature myeloid dendritic cell phenotype and morphology. They exerted more significant endocytosis and less antigen-presenting function than CD123(-)MDCs which are often referred to as typical MDCs. Meanwhile, CD123+ MDCs exhibited more significant tumor-inhibiting activity toward hematological tumor cell lines of U937 and Jurkat even at a low effector:target ratio. CD123+ MDCs expressed higher level of cytoplasmic TNF-alpha-related apoptosis-inducing ligand (TRAIL), but no detectable surface TRAIL and very little soluble TRAIL. Pretreatment with recombinant human TRAIL receptor 2:Fc fusion protein significantly reduced the tumor-inhibiting effect of CD123+ MDCs, but not of CD123(-) MDCs. Overall, our data demonstrated that CD123+ MDCs were an early-stage immature DC subset, with a significant tumor-inhibiting activity partially via involvement of enhanced cytoplasmic TRAIL.lld:pubmed
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pubmed-article:18555589pubmed:authorpubmed-author:NorY MYMlld:pubmed
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pubmed-article:18555589pubmed:pagination19-29lld:pubmed
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pubmed-article:18555589pubmed:year2008lld:pubmed
pubmed-article:18555589pubmed:articleTitleIdentification of CD123+ myeloid dendritic cells as an early-stage immature subset with strong tumoristatic potential.lld:pubmed
pubmed-article:18555589pubmed:affiliationDepartment of Hematology, Oncology and Respiratory Medicine, Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama, Japan.lld:pubmed
pubmed-article:18555589pubmed:publicationTypeJournal Articlelld:pubmed
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